This page has only limited features, please log in for full access.

Dr. Kumar Patchigolla
School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK

Basic Info


Research Keywords & Expertise

0 Heat transfer fluids
0 thermodynamic analysis
0 Solar thermal systems
0 Absorption chillers
0 Innovative cooling technologies

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 16 August 2021 in Energy
Reads 0
Downloads 0

Integration of thermal energy storage with concentrated solar power (CSP) plant aids in smoothing of the variable energy generation from renewable sources. Supercritical carbon dioxide (sCO2) cycles can reduce the levelised cost of electricity of a CSP plant through its higher efficiency and compact footprint compared to steam-Rankine cycles. This study systematically integrates nine sCO2 cycles including two novel configurations for CSP applications with a two-tank sensible heat storage system using a multi-objective optimisation. The performance of the sCO2 cycles is benchmarked against the thermal performance requirement of an ideal power cycle to reduce the plant overnight capital cost. The impacts of the compressor inlet temperature (CIT) and maximum turbine inlet temperature (TIT) on the cycle selection criteria are discussed. The influence of the cost function uncertainty on the selection of the optimal cycle is analysed using Monte-Carlo simulation. One of the novel cycle configurations (C8) proposed can reduce the overnight capital cost by 10.8% in comparison to a recompression Brayton cycle (C3) for a CIT of 55°C and TIT of 700°C. This work describes design guidelines facilitating the development/selection of an optimal cycle for a CSP application integrated with two-tank thermal storage.

ACS Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Jonathon Gillard; Kumar Patchigolla. Thermo-economic analysis, optimisation and systematic integration of supercritical carbon dioxide cycle with sensible heat thermal energy storage for CSP application. Energy 2021, 238, 121755 .

AMA Style

Dhinesh Thanganadar, Francesco Fornarelli, Sergio Camporeale, Faisal Asfand, Jonathon Gillard, Kumar Patchigolla. Thermo-economic analysis, optimisation and systematic integration of supercritical carbon dioxide cycle with sensible heat thermal energy storage for CSP application. Energy. 2021; 238 ():121755.

Chicago/Turabian Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Jonathon Gillard; Kumar Patchigolla. 2021. "Thermo-economic analysis, optimisation and systematic integration of supercritical carbon dioxide cycle with sensible heat thermal energy storage for CSP application." Energy 238, no. : 121755.

Journal article
Published: 31 July 2021 in Process Safety and Environmental Protection
Reads 0
Downloads 0

CO2 shipping is a viable transport alternative when pipelines are impractical. Lack of experience in large-scale CO2 shipping projects implies uncertainty in selecting optimal cargo conditions and operational safety procedures. The risk of uncontrolled release of CO2 arises in case of mechanical failure of storage or cargo vessels, and a thorough understanding of the discharge phenomena, including the propensity for solid formation, is necessary to develop safety protocols. A refrigerated experimental setup is established in this study to investigate the release phenomena of liquid CO2 under shipping conditions. The rig features a dome-ended cylindrical pressure vessel, a discharge pipe section and a liquid nitrogen refrigeration system that enables conditioning near the triple point – at ∼0.7 MPa, 223 K - and higher liquid pressures (∼2.6 MPa, 263 K). Pressure, temperature and mass monitoring were considered to enable an extensive observation of the leakage behaviour under typical operation scenarios. Three different sets of experiments were considered to inform the designer in the selection of optimal process conditions, with low-pressure (0.7 – 0.94 MPa, 223–228 K), medium-pressure (1.34–1.67 MPa, 234–245 K) and high-pressure tests (1.83–2.65 MPa, 249–259 K) demonstrating distinct behaviours relative to phase transitions, leakage duration and solidification of inventory.

ACS Style

Hisham Al Baroudi; Kumar Patchigolla; Dhinesh Thanganadar; Kranthi Jonnalagadda. Experimental study of accidental leakage behaviour of liquid CO2 under shipping conditions. Process Safety and Environmental Protection 2021, 153, 439 -451.

AMA Style

Hisham Al Baroudi, Kumar Patchigolla, Dhinesh Thanganadar, Kranthi Jonnalagadda. Experimental study of accidental leakage behaviour of liquid CO2 under shipping conditions. Process Safety and Environmental Protection. 2021; 153 ():439-451.

Chicago/Turabian Style

Hisham Al Baroudi; Kumar Patchigolla; Dhinesh Thanganadar; Kranthi Jonnalagadda. 2021. "Experimental study of accidental leakage behaviour of liquid CO2 under shipping conditions." Process Safety and Environmental Protection 153, no. : 439-451.

Preprint content
Published: 16 July 2021
Reads 0
Downloads 0
ACS Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. Recuperator Transient Simulation for Supercritical Carbon Dioxide Cycle in CSP Applications. 2021, 1 .

AMA Style

Dhinesh Thanganadar, Francesco Fornarelli, Sergio Camporeale, Faisal Asfand, Kumar Patchigolla. Recuperator Transient Simulation for Supercritical Carbon Dioxide Cycle in CSP Applications. . 2021; ():1.

Chicago/Turabian Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. 2021. "Recuperator Transient Simulation for Supercritical Carbon Dioxide Cycle in CSP Applications." , no. : 1.

Preprint content
Published: 16 July 2021
Reads 0
Downloads 0
ACS Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. Analysis of Design, Off-Design and Annual Performance of Supercritical CO2 Cycles for CSP Applications. 2021, 1 .

AMA Style

Dhinesh Thanganadar, Francesco Fornarelli, Sergio Camporeale, Faisal Asfand, Kumar Patchigolla. Analysis of Design, Off-Design and Annual Performance of Supercritical CO2 Cycles for CSP Applications. . 2021; ():1.

Chicago/Turabian Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. 2021. "Analysis of Design, Off-Design and Annual Performance of Supercritical CO2 Cycles for CSP Applications." , no. : 1.

Research article
Published: 23 June 2021 in Energy & Fuels
Reads 0
Downloads 0

Extensive research has been done on Ca-based sorbents as a promising way to capture CO2 and SO2 from power plants. Considerable effort has also been directed toward maintaining sorbent activity by means of sorbent modification to deal with activity decay with repeated CO2 capture cycles. Based on the principle of “treating waste with waste” and inspired by the idea that a pozzolanic reaction can enhance the surface area, this paper presents a method of hydrothermal synthesis of lime and coal ash. A small amount of CaSO4 or NaOH was added during the hydration process, and the mixture was stirred for several hours at about 90 °C. The synthesized samples were then characterized by scanning electron microscopy, nitrogen adsorption/desorption spectroscopy, and X-ray diffraction. The activity of the synthesized sorbent for CO2 and SO2 capture were then tested in a thermogravimetric analyzer. The treated samples demonstrate longer-lasting performance for CO2 cyclic capture, albeit with a slightly reduced capture ability compared to pure lime in the first few cycles due to their lower CaO content (25–81% versus 98%). The sample with a lime/ash mass ratio of 45:5 showed higher CO2 capture ability after three cycles and much greater stability in terms of its activity. The main product of the pozzolanic reaction is CaSiO3, which has a network structure, whose development is related to the ratio of CaO/coal ash, hydration duration, and the amount of CaSO4 and NaOH additives. After high temperature calcination, a new phase, namely Ca3Al2O6, is believed to serve as a skeleton preventing sintering in repeated capture cycles. After experiencing multiple cycles, the synthesized sorbents also have a high SO2 capture capacity. A small amount of added NaOH decreases the cyclic CO2 carrying capacity of the synthesized sorbent but enhances the SO2 carrying capacity dramatically. The explanation for this is that the sulfation reaction is controlled not only by gas diffusion but also by solid-state ion diffusion. Na+ ions generate more crystal lattice defects which can accelerate the ion diffusion rate in the product layer and consequentially enhance overall SO2 carrying capacity.

ACS Style

Zhenghui Zhao; Yinghai Wu; Kumar Patchigolla; Edward John Anthony; John Oakey; Hongwei Chen. Preparation and Characterization of Lime/Coal Ash Sorbents for Sequential CO2 and SO2 Capture at High Temperature. Energy & Fuels 2021, 1 .

AMA Style

Zhenghui Zhao, Yinghai Wu, Kumar Patchigolla, Edward John Anthony, John Oakey, Hongwei Chen. Preparation and Characterization of Lime/Coal Ash Sorbents for Sequential CO2 and SO2 Capture at High Temperature. Energy & Fuels. 2021; ():1.

Chicago/Turabian Style

Zhenghui Zhao; Yinghai Wu; Kumar Patchigolla; Edward John Anthony; John Oakey; Hongwei Chen. 2021. "Preparation and Characterization of Lime/Coal Ash Sorbents for Sequential CO2 and SO2 Capture at High Temperature." Energy & Fuels , no. : 1.

Journal article
Published: 18 June 2021 in Fuel Processing Technology
Reads 0
Downloads 0

High temperature CO2 and SO2 sequential capture in a bubbling fluidised bed was investigated using a natural limestone and synthetic composite pellets. Calcination was conducted under oxy-combustion conditions, while carbonation and sulphation occurred in an air-combustion atmosphere. The goal of sequential capture of CO2/SO2 is to desulphurise the flue gas first, followed by cyclic carbonation and calcination. Here, fresh sorbent is first used in the cyclic calcination/carbonation process and then the spent sorbent is sent for sulphation. The pellet carrying capacity is 0.29 g CO2/g sorbents for the first cycle, while that of natural limestone is about 0.45 g CO2/g sorbents. The carrying capacity first fell and then finally plateaued around 0.10 and 0.12 g CO2/g sorbents for limestone and pellets respectively. The SO2 carrying capacity for limestone and pellets after 20 cycles of CO2 capture was 0.17 and 0.22 g SO2/g sorbents respectively. This indicates that the sorbent spent in CO2 capture can be effectively reused for SO2 removal. Abrasion was observed to be the main mode of attrition, but some agglomeration was also found with increasing number of cycles and this may be a concern in the use of Ca-based sorbent for CO2 or SO2 fluidised bed capture.

ACS Style

Zhenghui Zhao; Kumar Patchigolla; Yinghai Wu; John Oakey; E.J. Anthony; Hongwei Chen. Performance study on Ca-based sorbents for sequential CO2 and SO2 capture in a bubbling fluidised bed. Fuel Processing Technology 2021, 221, 106938 .

AMA Style

Zhenghui Zhao, Kumar Patchigolla, Yinghai Wu, John Oakey, E.J. Anthony, Hongwei Chen. Performance study on Ca-based sorbents for sequential CO2 and SO2 capture in a bubbling fluidised bed. Fuel Processing Technology. 2021; 221 ():106938.

Chicago/Turabian Style

Zhenghui Zhao; Kumar Patchigolla; Yinghai Wu; John Oakey; E.J. Anthony; Hongwei Chen. 2021. "Performance study on Ca-based sorbents for sequential CO2 and SO2 capture in a bubbling fluidised bed." Fuel Processing Technology 221, no. : 106938.

Journal article
Published: 30 May 2021 in Energy Conversion and Management
Reads 0
Downloads 0

Supercritical carbon dioxide (sCO2) cycles can achieve higher efficiencies than an equivalent steam Rankine cycle at higher turbine inlet temperatures (>550 °C) with a compact footprint (tenfold). sCO2 cycles are low-pressure ratio cycles (~4–7), therefore recuperation is necessary, which reduces the heat-addition temperature range. Integration of sCO2 cycles with the boiler requires careful management of low-temperature heat to achieve higher plant efficiency. This study analyses four novel sCO2 cycle configurations which capture the low-temperature heat in an efficient way and the performance is benchmarked against the state-of-the-art steam Rankine cycle. The process parameters (13–16 variables) of all the cycle configurations are optimised using a genetic algorithm for two different turbine inlet temperatures (620 °C and 760 °C) and their techno-economic performance are compared against the advanced ultra-supercritical steam Rankine cycle. A sCO2 power cycle can achieve a higher efficiency than a steam Rankine cycle by about 3–4% points, which is correspond to a plant level efficiency of 2–3% points, leading to cost of electricity (COE) reduction. Although the cycle efficiency has increased when increasing turbine inlet temperature from 620 °C to 760 °C, the COE does not notably reduce owing to the increased capital cost. A detailed sensitivity study is performed for variations in compressor and turbine isentropic efficiency, pressure drop, recuperator approach temperature and capacity factor. The Monte-Carlo analysis shows that the COE can be reduced up to 6–8% compared to steam Rankine cycle, however, the uncertainty of the sCO2 cycle cost functions can diminish this to 0–3% at 95% percentile cumulative probability.

ACS Style

Dhinesh Thanganadar; Faisal Asfand; Kumar Patchigolla; Peter Turner. Techno-economic analysis of supercritical carbon dioxide cycle integrated with coal-fired power plant. Energy Conversion and Management 2021, 242, 114294 .

AMA Style

Dhinesh Thanganadar, Faisal Asfand, Kumar Patchigolla, Peter Turner. Techno-economic analysis of supercritical carbon dioxide cycle integrated with coal-fired power plant. Energy Conversion and Management. 2021; 242 ():114294.

Chicago/Turabian Style

Dhinesh Thanganadar; Faisal Asfand; Kumar Patchigolla; Peter Turner. 2021. "Techno-economic analysis of supercritical carbon dioxide cycle integrated with coal-fired power plant." Energy Conversion and Management 242, no. : 114294.

Journal article
Published: 23 April 2021 in Applied Thermal Engineering
Reads 0
Downloads 0

Investigating the potential to add solar tower and parabolic trough technology to aid coal-fired power generation could be a valuable intermediate step along the route to decarbonisation while making use of an existing assets, that would have a high efficiency and percentage contribution to utilise solar energy to reduce coal consumption. Based on the plant model of a typical 600 MWe coal-fired plant with the addition of tower and trough solar heat sources developed in Ebsilon Professional platform, the model predictive controller is developed in this study, incorporating the information of predictive weather data and real power load, to minimise accumulative coal consumption in a specific time horizon. Simulations on a typical day and a 10-day consecutive period are performed to observe the benefits and operation processes with a model predictive controller. Compared with a standard controller that doesn’t make use of future solar and load predictions, the typical day simulation shows, that the coal consumption reduction using a predictive control approach is increased by 21.3-tonne (13.6%), and 320.0-tonne (20.3%) in the 10 consecutive day simulation. The absolute difference of reduction tends to be most significant in high radiation conditions (day 2), which gave a 61.7-tonne (34.3%) saving. The improvement appears to be achieved by dispatching the thermal energy storage ability to store more energy and discharging thermal energy optimally. The benefits from this approach is insensitive to forecast error and shows sensitivity to system configurations, which tends to be greater with sufficient solar energy input but inadequate thermal storage capacity. While the general area of solar aided coal-fired plants have been investigated in various configurations by others, this paper is novel in that it examines the benefit of using future weather forecast data within a model predictive controller to significantly improve the potential solar contribution such a plant can use. As such it quantifies the potential improvements such an approach may achieve. In summary, the application in the solar tower and parabolic trough aided coal-fired power generation system improved the understanding of the benefits and the limitations in using the model predictive control in the operation process.

ACS Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. Model predictive control of a combined solar tower and parabolic trough aided coal-fired power plant. Applied Thermal Engineering 2021, 193, 116998 .

AMA Style

Hongtao Liu, Rongrong Zhai, Kumar Patchigolla, Peter Turner, Yongping Yang. Model predictive control of a combined solar tower and parabolic trough aided coal-fired power plant. Applied Thermal Engineering. 2021; 193 ():116998.

Chicago/Turabian Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. 2021. "Model predictive control of a combined solar tower and parabolic trough aided coal-fired power plant." Applied Thermal Engineering 193, no. : 116998.

Journal article
Published: 31 March 2021 in International Journal of Hydrogen Energy
Reads 0
Downloads 0

Renewable energy is a key solution in maintaining global warming below 2 °C. However, its intermittency necessitates the need for energy conversion technologies to meet demand when there are insufficient renewable energy resources. This study aims to tackle these challenges by thermo-electrochemical modelling and simulation of a reversible solid oxide fuel cell (RSOFC) and integration with the Haber Bosch process. The novelty of the proposed system is usage of nitrogen-rich fuel electrode exhaust gas for ammonia synthesis during fuel cell mode, which is usually combusted to prevent release of highly flammable hydrogen into the environment. RSOFC round-trip efficiencies of 41–53% have been attained when producing excess ammonia (144 kg NH3/hr) for the market and in-house consumption respectively. The designed system has the lowest reported ammonia electricity consumption of 6.4–8.21 kWh/kg NH3, power-to-hydrogen, power-to-ammonia, and power-generation efficiencies of 80%, 55–71% and, 64–66%.

ACS Style

Mulako Dean Mukelabai; Jonathon M. Gillard; Kumar Patchigolla. A novel integration of a green power-to-ammonia to power system: Reversible solid oxide fuel cell for hydrogen and power production coupled with an ammonia synthesis unit. International Journal of Hydrogen Energy 2021, 46, 18546 -18556.

AMA Style

Mulako Dean Mukelabai, Jonathon M. Gillard, Kumar Patchigolla. A novel integration of a green power-to-ammonia to power system: Reversible solid oxide fuel cell for hydrogen and power production coupled with an ammonia synthesis unit. International Journal of Hydrogen Energy. 2021; 46 (35):18546-18556.

Chicago/Turabian Style

Mulako Dean Mukelabai; Jonathon M. Gillard; Kumar Patchigolla. 2021. "A novel integration of a green power-to-ammonia to power system: Reversible solid oxide fuel cell for hydrogen and power production coupled with an ammonia synthesis unit." International Journal of Hydrogen Energy 46, no. 35: 18546-18556.

Review
Published: 13 February 2021 in Applied Energy
Reads 0
Downloads 0

Carbon Capture, Utilisation and Storage (CCUS) can reduce greenhouse gas emissions for a range of technologies which capture CO2 from a variety of sources and transport it to permanent storage locations such as depleted oil fields or saline aquifers or supply it for use. CO2 transport is the intermediate step in the CCUS chain and can use pipeline systems or sea carriers depending on the geographical location and the size of the emitter. In this paper, CO2 shipping is critically reviewed in order to explore its techno-economic feasibility in comparison to other transportation options. This review provides an overview of CO2 shipping for CCUS and scrutinises its potential role for global CO2 transport. It also provides insights into the technological advances in marine carrier CO2 transportation for CCUS, including preparation for shipping, and in addition investigates existing experience and discusses relevant transport properties and optimum conditions. Thus far, liquefied CO2 transportation by ship has been mainly used in the food and brewery industries for capacities varying between 800 m3 and 1000 m3. However, CCUS requires much greater capacities and only limited work is available on the large-scale transportation needs for the marine environment. Despite most literature suggesting conditions near the triple-point, in-depth analysis shows optimal transport conditions to be case sensitive and related to project variables. Ship-based transport of CO2 is a better option to decarbonise dislocated emitters over long distances and for relatively smaller quantities in comparison to offshore pipeline, as pipelines require a continuous flow of compressed gas and have a high cost-dependency on distance. Finally, this work explores the potential environmental footprint of marine chains, with particular reference to the energy implications and emissions from ships and their management. A careful scrutiny of potential future developments highlights the fact, that despite some existing challenges, implementation of CO2 shipping is crucial to support CCUS both in the UK and worldwide.

ACS Style

Hisham Al Baroudi; Adeola Awoyomi; Kumar Patchigolla; Kranthi Jonnalagadda; E.J. Anthony. A review of large-scale CO2 shipping and marine emissions management for carbon capture, utilisation and storage. Applied Energy 2021, 287, 116510 .

AMA Style

Hisham Al Baroudi, Adeola Awoyomi, Kumar Patchigolla, Kranthi Jonnalagadda, E.J. Anthony. A review of large-scale CO2 shipping and marine emissions management for carbon capture, utilisation and storage. Applied Energy. 2021; 287 ():116510.

Chicago/Turabian Style

Hisham Al Baroudi; Adeola Awoyomi; Kumar Patchigolla; Kranthi Jonnalagadda; E.J. Anthony. 2021. "A review of large-scale CO2 shipping and marine emissions management for carbon capture, utilisation and storage." Applied Energy 287, no. : 116510.

Journal article
Published: 18 November 2020 in Applied Energy
Reads 0
Downloads 0

Supercritical Carbon Dioxide (sCO2) cycles can achieve higher efficiency compared to steam-Rankine or Air-Brayton cycles, therefore they are promising for concentrated solar power applications. Although sCO2 cycles show higher design efficiency, the off-design efficiency is highly sensitive to the ambient conditions, impacting the power block net-power and heat input. In the present work a recompression sCO2 cycle is connected to a central-tower solar field with two-tank thermal storage delivering molten chloride salt at 670 °C. The temperature of the molten-salt exiting from the power block and returning to the cold storage tank increases by 46 °C with respect to the design value when the compressor inlet temperature is raised by 13 °C relative to the design condition of 42 °C, which implies that the capacity of the thermal storage reduces by 25%. The main focus of this work is to investigate the off-design performance of a sCO2 recompression cycle under variable ambient temperature, molten-salt inlet temperature and molten-salt flow rate. Multi-objective optimisation is carried-out in off-design conditions using an in-house code to explore the optimal operational strategies and the Pareto fronts were compared. Since the power cycle can either be operated in maximum power mode or maximum efficiency mode, this study compares these two operational strategies based on their annual performance. Results indicate that the capacity factor of the concentrated solar power can be increased by 10.8% when operating in maximum power mode whilst the number of start-ups is reduced by about 50% when operating in maximum efficiency mode.

ACS Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. Off-design and annual performance analysis of supercritical carbon dioxide cycle with thermal storage for CSP application. Applied Energy 2020, 282, 116200 .

AMA Style

Dhinesh Thanganadar, Francesco Fornarelli, Sergio Camporeale, Faisal Asfand, Kumar Patchigolla. Off-design and annual performance analysis of supercritical carbon dioxide cycle with thermal storage for CSP application. Applied Energy. 2020; 282 ():116200.

Chicago/Turabian Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. 2020. "Off-design and annual performance analysis of supercritical carbon dioxide cycle with thermal storage for CSP application." Applied Energy 282, no. : 116200.

Journal article
Published: 29 October 2020 in Molecules
Reads 0
Downloads 0

This study explores the use of a novel activating agent and demonstrates the production and characterisation of activated carbon (AC) from a combine palm waste (CPW) in 3:2:1 proportion by weight of empty fruit bunch, mesocarp fibre and palm kernel shell. The resulting biomass was processed by a microwave-assisted method using trona and compared with material produced by conventional routes. These results demonstrate the potential of trona ore as an activating agent and the effectiveness of using a combined palm waste for a single stream activation process. It also assesses the effectiveness of trona ore in the elimination of alcohol, acids and aldehydes; with a focus on increasing the hydrophilicity of the resultant AC. The optimum results for the conventional production technique at 800 °C yielded a material with SBET 920 m2/g, Vtotal 0.840 cm3/g, a mean pore diameter of 2.2 nm and an AC yield 40%. The optimum outcome of the microwave assisted technique for CPW was achieved at 600 W, SBET is 980 m2/g; Vtotal 0.865 cm3/g; a mean pore diameter 2.2 nm and an AC yield of 42%. Fourier transform infrared spectrometry analyses showed that palm waste can be combined to produce AC and that trona ore has the capacity to significantly enhance biomass activation.

ACS Style

Kalu Ukanwa; Kumar Patchigolla; Ruben Sakrabani; Edward Anthony. Preparation and Characterisation of Activated Carbon from Palm Mixed Waste Treated with Trona Ore. Molecules 2020, 25, 5028 .

AMA Style

Kalu Ukanwa, Kumar Patchigolla, Ruben Sakrabani, Edward Anthony. Preparation and Characterisation of Activated Carbon from Palm Mixed Waste Treated with Trona Ore. Molecules. 2020; 25 (21):5028.

Chicago/Turabian Style

Kalu Ukanwa; Kumar Patchigolla; Ruben Sakrabani; Edward Anthony. 2020. "Preparation and Characterisation of Activated Carbon from Palm Mixed Waste Treated with Trona Ore." Molecules 25, no. 21: 5028.

Journal article
Published: 13 October 2020 in Applied Thermal Engineering
Reads 0
Downloads 0

The solar tower and parabolic trough aided coal-fired power generation has been demonstrated as a promising technology and has potential advantages in utilisation of solar energy in a cost-effective manner. Due to introduction of solar energy, from the solar tower or parabolic troughs, increases to a certain extent, the steam temperature would be difficult to maintain and leads to safety concerns. Therefore, the limitation of integrated solar energy, considering the overlapped influence of different solar energy input, needs to be well identified and managed. This work considered a 600 MWe integrated system as an example. Solar energy from parabolic troughs is used in the preheater while energy from the solar tower is used to reheat steam. The novelty of this study is the interaction of different solar energy input in fossil plants and its benefits is revealed for the first time. The maximum absorbed solar energy, considering the mutual effects of introduced solar energy flows, are explored. Then the system performance under three different loads (100%, 75%, 50%) and hourly operational performance in four typical days are analysed. The paper shows that the feed-water extraction results in the enhancement of maximum solar energy absorbed by reheat steam extraction, is improved by 24.2 MWth (28.5%), 11.5 MWth (20.0%), and 5.6 MWth (14.3%) as feed-water extraction percentages increase at the three load conditions. As a result, the minimum standard coal consumption rates are improved by 13.2 g/kWh (5.2%), 10.7 (4.1%) g/kWh and 9.0 g/kWh (3.1%) respectively. In four typical days, the highest coal consumption reduction is reached in the summer solstice, which is 266.6-tonne, 202.8-tonne and 131.4-tonne under three different loads, while the highest coal consumption is obtained in the winter solstice.

ACS Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. Off-design thermodynamic performances of a combined solar tower and parabolic trough aided coal-fired power plant. Applied Thermal Engineering 2020, 183, 116199 .

AMA Style

Hongtao Liu, Rongrong Zhai, Kumar Patchigolla, Peter Turner, Yongping Yang. Off-design thermodynamic performances of a combined solar tower and parabolic trough aided coal-fired power plant. Applied Thermal Engineering. 2020; 183 ():116199.

Chicago/Turabian Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. 2020. "Off-design thermodynamic performances of a combined solar tower and parabolic trough aided coal-fired power plant." Applied Thermal Engineering 183, no. : 116199.

Conference paper
Published: 21 September 2020 in Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2
Reads 0
Downloads 0

Supercritical carbon dioxide (sCO2) cycles are studied as the next-generation power cycles in order to reduce the cost of Concentrating Solar Power (CSP) plants. The design performance of numerous cycles has been investigated, nevertheless, the off-design and annual performance of these cycles are seldom studied. This plays a critical role in selecting an optimal cycle for CSP application, as an efficient power cycle influences the solar field size, consequently affecting the Levelised cost of electricity (LCOE). In this study, the design, off-design and annual performance of three sCO2 cycles; simple recuperative, recompression and partial-cooling cycles are studied. Multi-objective optimisation was performed and the off-design Pareto fronts were compared for the changes in the power cycle boundary conditions. Annual performance simulation was carried out, and the performance of the three cycles was compared when the power cycle is operated in maximum efficiency mode, which facilitates selecting the optimal cycle. The LCOE of the simple recuperated cycle was higher by roughly 1.7¢/kWh than recompression cycle when maximising the power cycle efficiency and the partial cooling cycle is higher by 0.2¢/kWh. However, operating the power cycle in the maximum efficiency mode significantly lowers the plant capacity factor (around 10–20%).

ACS Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. Analysis of Design, Off-Design and Annual Performance of Supercritical CO2 Cycles for CSP Applications. Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2 2020, 1 .

AMA Style

Dhinesh Thanganadar, Francesco Fornarelli, Sergio Camporeale, Faisal Asfand, Kumar Patchigolla. Analysis of Design, Off-Design and Annual Performance of Supercritical CO2 Cycles for CSP Applications. Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2. 2020; ():1.

Chicago/Turabian Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. 2020. "Analysis of Design, Off-Design and Annual Performance of Supercritical CO2 Cycles for CSP Applications." Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2 , no. : 1.

Conference paper
Published: 21 September 2020 in Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2
Reads 0
Downloads 0

Supercritical carbon dioxide (sCO2) cycles are considered to provide a faster response to load change owing to their compact footprint. sCO2 cycles are generally highly recuperative, therefore the response time is mainly dictated by the heat exchanger characteristics. This study model the transient behaviour of a recuperator in 10 MWe simple recuperative Brayton cycle. The response for the variation of inlet temperature and mass flow boundary conditions were investigated using two approaches based on temperature and enthalpy. The performance of these two approaches are compared and the numerical schemes were discussed along with the challenges encountered. The simulation results were validated against the experimental data available in the literature with a fair agreement. The characteristic time of the heat exchanger for a step change of the boundary conditions is reported that supports the recuperator design process. Compact recuperator responded in less than 20 seconds for the changes in the temperature boundary condition whilst it can take upto 1.5 minutes for mass flow change. In order to reduce the computational effort, a logarithmic indexed lookup table approach is presented, reducing the simulation time by a factor of 20.

ACS Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. Recuperator Transient Simulation for Supercritical Carbon Dioxide Cycle in CSP Applications. Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2 2020, 1 .

AMA Style

Dhinesh Thanganadar, Francesco Fornarelli, Sergio Camporeale, Faisal Asfand, Kumar Patchigolla. Recuperator Transient Simulation for Supercritical Carbon Dioxide Cycle in CSP Applications. Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2. 2020; ():1.

Chicago/Turabian Style

Dhinesh Thanganadar; Francesco Fornarelli; Sergio Camporeale; Faisal Asfand; Kumar Patchigolla. 2020. "Recuperator Transient Simulation for Supercritical Carbon Dioxide Cycle in CSP Applications." Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2 , no. : 1.

Journal article
Published: 22 July 2020 in Energy Reports
Reads 0
Downloads 0

The present study focused on co-gasification of empty fruit bunch (EFB), mesocarp fibre (MF) and palm kernel shell (PKS) in a 75 kWth pilot scale downdraft gasifier for possible synergic reactions between the biomass. A series of experiments was carried out using equal blend of EFB, MF, and PKS (particle sizes of 14 and 6.7 mm) and equal blend of MF and PKS. Advanced infrared multi-gas analyser, and thermal conductivity gas analyser were employed to measure the produced gases. The elemental compositions of the raw biomass, ash and slag generated were determined using Scanning Field Emission Gun Scanning Electron Microscopy with accelerating voltage 20.0 kV and working distance 6 mm and the measurements processed using AztecEnergy V2.2 software. The co-gasification of blend of EFB, MF, and PKS, compared to the blend of MF and PKS led to higher gas yield (4.82 and 3.47 m3/kg_biomass), cold gas efficiency (16.2 and 13.37%), and carbon conversion efficiency (56.3 and 34.18%), respectively. When compared to particle size of 14 mm, the PKS of particle size of 6.7 mm in the EFB/MF/PKS blend increased the lower heating value and the higher heating value of the producer gas by 20% and 20.3%, respectively, and the residue yield was 18.6% less. The overall result has provided evidence on the importance of co-gasification of biomass especially EFB, MF and PKS, which will result in increased utilization of EFB.

ACS Style

Kelechi E. Anyaoha; Ruben Sakrabani; Kumar Patchigolla; Abdul M. Mouazen. Co-gasification of oil palm biomass in a pilot scale downdraft gasifier. Energy Reports 2020, 6, 1888 -1896.

AMA Style

Kelechi E. Anyaoha, Ruben Sakrabani, Kumar Patchigolla, Abdul M. Mouazen. Co-gasification of oil palm biomass in a pilot scale downdraft gasifier. Energy Reports. 2020; 6 ():1888-1896.

Chicago/Turabian Style

Kelechi E. Anyaoha; Ruben Sakrabani; Kumar Patchigolla; Abdul M. Mouazen. 2020. "Co-gasification of oil palm biomass in a pilot scale downdraft gasifier." Energy Reports 6, no. : 1888-1896.

Journal article
Published: 21 July 2020 in Energy Conversion and Management
Reads 0
Downloads 0

Clean and carbon-free hydrogen production is expected to play a vital role in future global energy transitions. In this work, six process arrangements for sorption enhanced steam methane reforming (SE-SMR) are proposed for blue H2 production: 1) SE-SMR with an air fired calciner, 2) SE-SMR with a Pressure Swing Adsorption (PSA) unit, 3) SE-SMR thermally coupled with Chemical-Looping Combustion (CLC), 4) SE-SMR+PSA+CLC, 5) SE-SMR+PSA with an oxy-fired calciner, 6) SE-SMR+PSA with an indirect H2 -fired calciner. The proposed process models with rigorous heat exchanger network design were simulated in Aspen Plus to understand the thermodynamic limitations in achieving the maximum CH4 conversion, H2 purity, CO2 capture efficiency, cold gas efficiency and net operating efficiency. A sensitivity study was also performed for changes in the reformer temperature, pressure, and steam to carbon (S/C) ratio to explore the optimal operating space for each case. The SE-SMR+PSA+H2 recycle process (Case 6) can achieve a maximum of 94.2% carbon capture with a trade-off in cold gas efficiency (51.3%), while a near 100% carbon capture with the maximum net efficiency of up to 76.3% is realisable by integrating CLC and PSA (Case 4) at 25 bar. Integration of oxy-fuel combustion lowers the net efficiency by 2.7% points due to the need for an air separation unit. In addition, the SE-SMR with the PSA_process can be designed as a self-sustaining process without any additional fuel required to meet the process heat utility when the S/C ratio is ~3–3.5.

ACS Style

Yongliang Yan; Dhinesh Thanganadar; Peter T. Clough; Sanjay Mukherjee; Kumar Patchigolla; Vasilije Manovic; Edward J. Anthony. Process simulations of blue hydrogen production by upgraded sorption enhanced steam methane reforming (SE-SMR) processes. Energy Conversion and Management 2020, 222, 113144 .

AMA Style

Yongliang Yan, Dhinesh Thanganadar, Peter T. Clough, Sanjay Mukherjee, Kumar Patchigolla, Vasilije Manovic, Edward J. Anthony. Process simulations of blue hydrogen production by upgraded sorption enhanced steam methane reforming (SE-SMR) processes. Energy Conversion and Management. 2020; 222 ():113144.

Chicago/Turabian Style

Yongliang Yan; Dhinesh Thanganadar; Peter T. Clough; Sanjay Mukherjee; Kumar Patchigolla; Vasilije Manovic; Edward J. Anthony. 2020. "Process simulations of blue hydrogen production by upgraded sorption enhanced steam methane reforming (SE-SMR) processes." Energy Conversion and Management 222, no. : 113144.

Journal article
Published: 12 June 2020 in Energy Conversion and Management
Reads 0
Downloads 0

Multi-heat-source power generation system is a promising technology to reduce fossil fuel consumption and save investment costs by integrating several heat sources and sharing power equipment components. Researchers have conducted many case studies based on specific power plants to find the preferred integration scheme. However, there is still no unified theory to guide the integration of different energy sources. To explore a common method to integrate various energy sources, this work developed a general multi-heat-source integrated system model based on finite-time thermodynamics, considering the external and internal irreversibility due to the constraint of finite-time and finite-size. The generalised expressions for optimum integration method are explored and expressed in dimensionless parameters. This study indicated the system with two heat-sources performs differently in four regions due to the variation of endothermic temperatures. The characteristics of energy flow and irreversibility reveal that by adding a second heat-source, the first heat-source energy can be substantially reduced at the cost of system efficiency slightly decreasing. Then four application cases for solar-aided coal-fired power plants are conducted to check its feasibility and potential to provide the performance bound of integrating multi-heat-sources.

ACS Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. Analysis of integration method in multi-heat-source power generation systems based on finite-time thermodynamics. Energy Conversion and Management 2020, 220, 113069 .

AMA Style

Hongtao Liu, Rongrong Zhai, Kumar Patchigolla, Peter Turner, Yongping Yang. Analysis of integration method in multi-heat-source power generation systems based on finite-time thermodynamics. Energy Conversion and Management. 2020; 220 ():113069.

Chicago/Turabian Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. 2020. "Analysis of integration method in multi-heat-source power generation systems based on finite-time thermodynamics." Energy Conversion and Management 220, no. : 113069.

Journal article
Published: 10 June 2020 in Sustainability
Reads 0
Downloads 0

The use of wet cooling in Concentrated Solar Power (CSP) plants tends to be an unfavourable option in regions where water is scarce due to the high water requirements of the method. Dry-cooling systems allow a water consumption reduction of up to 80% but at the expense of lower electricity production. A hybrid cooling system (the combination of dry and wet cooling) offers the advantages of each process in terms of lower water consumption and higher electricity production. A model of a CSP plant which integrates a hybrid cooling system has been implemented in Thermoflex software. The water consumption and the net power generation have been evaluated for different configurations of the hybrid cooling system: series, parallel, series-parallel and parallel-series. It was found that the most favourable configuration in terms of water saving was series-parallel, in which a water reduction of up to 50% is possible compared to the only-wet cooling option, whereas an increase of 2.5% in the power generation is possible compared to the only-dry cooling option. The parallel configuration was the best in terms of power generation with an increase of 3.2% when compared with the only-dry cooling option, and a reduction of 30% water consumption compared to the only-wet cooling option.

ACS Style

Faisal Asfand; Patricia Palenzuela; Lidia Roca; Adèle Caron; Charles-André Lemarié; Jon Gillard; Peter Turner; Kumar Patchigolla. Thermodynamic Performance and Water Consumption of Hybrid Cooling System Configurations for Concentrated Solar Power Plants. Sustainability 2020, 12, 1 .

AMA Style

Faisal Asfand, Patricia Palenzuela, Lidia Roca, Adèle Caron, Charles-André Lemarié, Jon Gillard, Peter Turner, Kumar Patchigolla. Thermodynamic Performance and Water Consumption of Hybrid Cooling System Configurations for Concentrated Solar Power Plants. Sustainability. 2020; 12 (11):1.

Chicago/Turabian Style

Faisal Asfand; Patricia Palenzuela; Lidia Roca; Adèle Caron; Charles-André Lemarié; Jon Gillard; Peter Turner; Kumar Patchigolla. 2020. "Thermodynamic Performance and Water Consumption of Hybrid Cooling System Configurations for Concentrated Solar Power Plants." Sustainability 12, no. 11: 1.

Journal article
Published: 15 April 2020 in Energy
Reads 0
Downloads 0

Solar-aided coal-fired power generation systems have been extensively studied and exhibit several advantages in the utilisation of solar energy. The issue with the solar augmentation of coal-fired plants is the limitation of the potential solar contribution that is practical to achieve when considering boiler safety issues. This study proposes the combination of parabolic troughs and solar towers to collect solar energy, that is then introduced into the preheaters and boilers of coal-fired power plants. Under the same investment conditions, this combination of solar technologies can provide more solar exergy and reduce the practical constraints on the solar contribution. The paper shows that the potential for a 660MWe power plant, integrated with a combined solar field allows the highest solar exergy share of 8.51% to be reached. This enables an increased fuel saving of at least 1.58 and 4.24 g/kWh compared to other systems, that gives a minimum coal consumption of 253.17 and 255.83 g/kWh, respectively. The combined solar field provides a maximum available solar exergy of 69.43 MWth, which is 7.83%–11.88% higher than the alternative compared systems. The enhanced solar exergy contribution and cost-effectiveness can be observed in this novel system under different solar loads and cost conditions.

ACS Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. Performance analysis of a novel combined solar trough and tower aided coal-fired power generation system. Energy 2020, 201, 117597 .

AMA Style

Hongtao Liu, Rongrong Zhai, Kumar Patchigolla, Peter Turner, Yongping Yang. Performance analysis of a novel combined solar trough and tower aided coal-fired power generation system. Energy. 2020; 201 ():117597.

Chicago/Turabian Style

Hongtao Liu; Rongrong Zhai; Kumar Patchigolla; Peter Turner; Yongping Yang. 2020. "Performance analysis of a novel combined solar trough and tower aided coal-fired power generation system." Energy 201, no. : 117597.