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Rongrong Zhai
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China

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Journal article
Published: 23 April 2021 in Applied Thermal Engineering
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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: 13 October 2020 in Applied Thermal Engineering
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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.

Journal article
Published: 12 June 2020 in Energy Conversion and Management
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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: 15 April 2020 in Energy
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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.

Journal article
Published: 25 February 2020 in Applied Thermal Engineering
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In this paper, a novel solar tower aided coal-fired power (STACP) system is proposed by introducing a solar reheater. In this system, solar energy is used to reheat exhaust steam from an immediate turbine to improve the operating parameter of a regenerative cycle. The thermodynamic, environment, and economic performances of the STACP system in both power-boosting (PB) and fuel-saving (FS) modes are discussed and compared. Subsequently, the effects of reheat temperature and system power load are investigated. Results indicate that for a 300 MWe coal-fired unit, the solar energy used in the PB and FS modes are 81.82 and 71.69 MW, respectively. Compared with the coal-fired power system, the standard coal consumption rate of the STACP system in PB and FS modes can be reduced by 35.98 and 34.99 g/kWh, respectively, whereas the CO2 emission rate of the STACP system in PB and FS modes can be reduced by 101.79 and 98.99 g/kWh, respectively. The additional equipment cost of a solar field in PB and FS modes are 49.76 and 43.60 million US$, respectively. Moreover, the cost of electricity for power generated by solar energy for both modes is 3.37 US cents/kWh.

ACS Style

Chao Li; Rongrong Zhai; Bin Zhang; Wei Chen. Thermodynamic performance of a novel solar tower aided coal-fired power system. Applied Thermal Engineering 2020, 171, 115127 .

AMA Style

Chao Li, Rongrong Zhai, Bin Zhang, Wei Chen. Thermodynamic performance of a novel solar tower aided coal-fired power system. Applied Thermal Engineering. 2020; 171 ():115127.

Chicago/Turabian Style

Chao Li; Rongrong Zhai; Bin Zhang; Wei Chen. 2020. "Thermodynamic performance of a novel solar tower aided coal-fired power system." Applied Thermal Engineering 171, no. : 115127.

Journal article
Published: 23 February 2020 in Energies
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The main purpose of this paper is to quantitatively analyze the sensitivity of operating parameters of the system to the thermodynamic performance of an oxyfuel combustion (OC) power generation system. Therefore, the thermodynamic model of a 600 MW subcritical OC power generation system with semi-dry flue gas recirculation was established. Two energy consumption indexes of the system were selected, process simulation was adopted, and orthogonal design, range analysis, and variance analysis were used for the first time on the basis of single-factor analysis to conduct a comprehensive sensitivity analysis and optimization research on the changes of four operating parameters. The results show that with increasing oxygen purity, the net standard coal consumption rate first decreases and then increases. With decreasing oxygen concentration, the recirculation rate of dry flue gas in boiler flue gas ( χ 1 ) and an increasing excess oxygen coefficient, the net standard coal consumption rate increases. The net electrical efficiency was just the opposite. The sensitivity order of two factors for four indexes is obtained: the excess oxygen coefficient was the main factor that affects the net standard coal consumption rate and the net electrical efficiency. The influence of oxygen concentration and oxygen purity was lower than that of excess oxygen coefficient, and χ 1 has almost no effect.

ACS Style

Zhiyu Zhang; Rongrong Zhai; Xinwei Wang; Yongping Yang. Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods. Energies 2020, 13, 998 .

AMA Style

Zhiyu Zhang, Rongrong Zhai, Xinwei Wang, Yongping Yang. Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods. Energies. 2020; 13 (4):998.

Chicago/Turabian Style

Zhiyu Zhang; Rongrong Zhai; Xinwei Wang; Yongping Yang. 2020. "Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods." Energies 13, no. 4: 998.

Journal article
Published: 30 July 2019 in Energy & Fuels
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ACS Style

Rongrong Zhai; Lingjie Feng; Hai Yu; Yulong Wang; Yongping Yang. Integration of Power Plants with Different Capacities with Aqueous Ammonia-Based CO2 Capture. Energy & Fuels 2019, 33, 9040 -9054.

AMA Style

Rongrong Zhai, Lingjie Feng, Hai Yu, Yulong Wang, Yongping Yang. Integration of Power Plants with Different Capacities with Aqueous Ammonia-Based CO2 Capture. Energy & Fuels. 2019; 33 (9):9040-9054.

Chicago/Turabian Style

Rongrong Zhai; Lingjie Feng; Hai Yu; Yulong Wang; Yongping Yang. 2019. "Integration of Power Plants with Different Capacities with Aqueous Ammonia-Based CO2 Capture." Energy & Fuels 33, no. 9: 9040-9054.

Journal article
Published: 09 April 2019 in Solar Energy
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In thermal-storage photovoltaic-concentrated solar power (PV-CSP) systems, the fluctuant part electricity is stored in thermal energy storage (TES) system instead of high-cost batteries. In this research, PV nominal power, system power output point and TES capacity in different dispatch strategies are optimized by GA-PSO to achieve a minimized levelized cost of electricity. Then, more power output points are set in each strategy, operating performance and optimal configuration in these complex strategies are studied. After that, optimal configurations and operating characteristics in different heliostats and PV panels cost are explored, and the battery bank is considered. Results show that for the selected CSP subsystem in constant-output strategy, in which CSP power responds to PV power output to provide a constant system power curve, the optimal PV nominal power is 35.23 MW, system power output point is at the CSP-rated power and LCOE is 16.93 ¢/kWh. For independent-output strategy, in which CSP and PV provide power independently, optimal PV nominal power is 213.91 MW, PV power output point is 76.10 MW and LCOE is 16.33 ¢/kWh. For constant-output strategy with one (50% load) or three (75%, 50%, 25% load) middle power output points settled, the optimal systems based on these complex strategies can reach a lower LCOE of 15.32 ¢/kWh and 15.15 ¢/kWh, respectively. In independent-output strategy, LCOE of optimal systems based on complex strategies is 14.33 ¢/kWh and 12.80 ¢/kWh, respectively. In general, the operating performance are more superior and steadier for CON strategy and a large-scale PV subsystem is needed for IND strategy in most conditions.

ACS Style

Hongtao Liu; Rongrong Zhai; Jiaxin Fu; Yulong Wang; Yongping Yang. Optimization study of thermal-storage PV-CSP integrated system based on GA-PSO algorithm. Solar Energy 2019, 184, 391 -409.

AMA Style

Hongtao Liu, Rongrong Zhai, Jiaxin Fu, Yulong Wang, Yongping Yang. Optimization study of thermal-storage PV-CSP integrated system based on GA-PSO algorithm. Solar Energy. 2019; 184 ():391-409.

Chicago/Turabian Style

Hongtao Liu; Rongrong Zhai; Jiaxin Fu; Yulong Wang; Yongping Yang. 2019. "Optimization study of thermal-storage PV-CSP integrated system based on GA-PSO algorithm." Solar Energy 184, no. : 391-409.

Journal article
Published: 03 April 2019 in Energies
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This study investigates the multi-objective optimization of load dispatch of a solar-assisted coal-fired power generation system. The improved environmental/economic load dispatch model considers coal consumption, NOx emissions, and power purchase cost. The singular weighted method is utilized to solve this multi-objective and multi-constraint optimization problem. A power system that includes five power generators, one of which is retrofitted to a solar-assisted coal-fired unit, is also analyzed. It can be concluded that the loads of solar-assisted coal-fired units are higher than the original coal-fired unit, and with the increase of solar radiation, the gap between the loads of two units also increases. In addition, after retrofitting, the coal consumption, the NOx emission, and power costs of units reduce by about 2.05%, 0.45%, and 0.14%, respectively. From the study on the on-grid power tariff, where the tariff drops from 16.29 cents/kWh to 3.26 cents/kWh, NOx emissions drop from 12.31 t to 11.28 t per day, a reduction of about 8.38%. The cost of purchasing electricity decreases from $ 2,982,161.8 to $ 2,020,505.0 per day, a decrease of 32.25%. Therefore, when both coal-fired units and solar-assisted coal-fired units exist in a region, the use of solar-assisted coal-fired power generation units should be prioritized.

ACS Style

Rongrong Zhai; Lingjie Feng; Hai Yu; Chao Li; Yongping Yang. Optimization of Dispatching Electricity Market with Consideration of a Solar-Assisted Coal-Fired Power Generation System. Energies 2019, 12, 1284 .

AMA Style

Rongrong Zhai, Lingjie Feng, Hai Yu, Chao Li, Yongping Yang. Optimization of Dispatching Electricity Market with Consideration of a Solar-Assisted Coal-Fired Power Generation System. Energies. 2019; 12 (7):1284.

Chicago/Turabian Style

Rongrong Zhai; Lingjie Feng; Hai Yu; Chao Li; Yongping Yang. 2019. "Optimization of Dispatching Electricity Market with Consideration of a Solar-Assisted Coal-Fired Power Generation System." Energies 12, no. 7: 1284.

Journal article
Published: 10 January 2019 in Applied Energy
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The integration of solar energy into coal-fired power plants has been proven as a potential approach in the utilization of solar energy to reduce coal consumption. Moreover, solar augmentation offers low cost and low risk alternatives to stand-alone solar thermal power plants. In this study, the annual performance of a solar tower aided coal-fired power (STACP) system is investigated, and the influence of thermal storage system capacity on the annual solar generating power and annual solar-to-electricity efficiency is explored. The thermal storage system capacity is optimized to obtain the lowest levelized cost of electricity (LCOE). At the same time, the influence and sensitivity of several important economic factors are explored and assessed. Results demonstrate that compared to a coal-fired power system, the reduction in the annual average coal consumption rate of the STACP system with high direct normal irradiance (DNI), medium DNI, and low DNI are 5.79, 4.52, and 3.22 g/kWh, respectively. At a minimum, the annual coal consumption can be reduced by 14,000 t in a 600 MWe power generation unit. Because the same solar field is considered under different DNI conditions, the LCOE in the high DNI, medium DNI, and low DNI scenarios are all fairly similar (6.37, 6.40, and 6.41 ¢/kWh, respectively). When the solar multiple is 3.0, the optimal thermal storage capacity of the STACP system, with high, medium, and low DNIs are 6.73, 4.42, and 2.21 h, respectively. The sensitivity analysis shows that the change in economic parameters exerts more influence on the STACP system with the high DNI compared with the other two scenarios.

ACS Style

Chao Li; Rongrong Zhai; Yongping Yang; Kumar Patchigolla; John E. Oakey; Peter Turner. Annual performance analysis and optimization of a solar tower aided coal-fired power plant. Applied Energy 2019, 237, 440 -456.

AMA Style

Chao Li, Rongrong Zhai, Yongping Yang, Kumar Patchigolla, John E. Oakey, Peter Turner. Annual performance analysis and optimization of a solar tower aided coal-fired power plant. Applied Energy. 2019; 237 ():440-456.

Chicago/Turabian Style

Chao Li; Rongrong Zhai; Yongping Yang; Kumar Patchigolla; John E. Oakey; Peter Turner. 2019. "Annual performance analysis and optimization of a solar tower aided coal-fired power plant." Applied Energy 237, no. : 440-456.

Research article
Published: 06 November 2018 in International Journal of Photoenergy
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Solar energy is the most abundant renewable energy and it has a great potential for development. There are two ways to transfer solar energy to electricity: photovoltaic power generation (PV) and concentrated solar power (CSP). CSP-PV hybrid system can be fully integrated with the advantages of the two systems to achieve low cost, stable output, and manageable to generate electricity. In this paper, the operation strategy of the CSP-PV system is proposed for parabolic trough CSP system and PV system which are now commercially operated. Genetic algorithm is used to optimize the design of the system and calculate PV-installed capacity, battery capacity, and storage capacity of CSP system, making the system to achieve the lowest cost of electricity generation. The results show that the introduction of the CSP system makes it possible to ensure the stability of the output power of hybrid system when the battery capacity is small, which greatly improves the annual utilization time of the PV and reduces solar abandonment. When the system is optimized by operation characteristics of Spring Equinox, the lowest LCOE is 0.0627 $/kWh, the rated capacity of PV and CSP system are 222.462 MW and 30 MW, respectively, and the capacity of heat storage and battery are 356.562 MWh and 14.687 MWh. When the system is optimized by the operation characteristics of the whole year, the lowest LCOE is 0.0555 $/kWh, the rated capacity of PV and CSP system are 242.954 MW and 30 MW, respectively, and the capacity of heat storage and battery are 136.059 MWh and 8.977 MWh. The comparison shows that the power generation curves of the hybrid system are similar in the two optimization-based methods—Spring Equinox based and annual based, but LCOE is lower when optimized by the annual operation characteristic, and the annual utilization rate of the system is higher when optimized by Spring Equinox based.

ACS Style

Rongrong Zhai; Ying Chen; Hongtao Liu; Hao Wu; Yongping Yang. Optimal Design Method of a Hybrid CSP-PV Plant Based on Genetic Algorithm Considering the Operation Strategy. International Journal of Photoenergy 2018, 2018, 1 -15.

AMA Style

Rongrong Zhai, Ying Chen, Hongtao Liu, Hao Wu, Yongping Yang. Optimal Design Method of a Hybrid CSP-PV Plant Based on Genetic Algorithm Considering the Operation Strategy. International Journal of Photoenergy. 2018; 2018 ():1-15.

Chicago/Turabian Style

Rongrong Zhai; Ying Chen; Hongtao Liu; Hao Wu; Yongping Yang. 2018. "Optimal Design Method of a Hybrid CSP-PV Plant Based on Genetic Algorithm Considering the Operation Strategy." International Journal of Photoenergy 2018, no. : 1-15.

Research article
Published: 07 September 2018 in Energy & Fuels
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The techno-economic performance of a coal fired power plant integrated with postcombustion capture is affected by not only the capture system but also the way the power plant is operated. The existing integration studies typically use amines as the CO2 capture absorbent. However, amines will degrade in the capture process and produce harmful substances. Ammonia is a robust, low-cost alternative solvent for reducing CO2 emissions from coal-fired power plants. On the basis of a 660 MW coal-fired power plant, this study analyzes the performance of the integration of coal-fired power plant with an ammonia-based CO2 capture process in three operation modes which include (1) reduction of power plant output compared to the original power station without CO2 capture and 85% CO2 capture efficiency, (2) the same power output as the original power station without CO2 capture and the same CO2 capture rate as in (1), and (3) the same power output as the original power station without CO2 capture and 85% CO2 capture efficiency. In each of three operation modes, we also analyzed the effect of stream extraction with and without auxiliary equipment energy consumptions in the CO2 capture process on the energy performance of the power plant. Results show that operation mode 2 exerts the least energy penalty on the power plant, but captures less CO2. On the premise of capturing as much CO2 as possible, operation mode 3 is the optimal operating mode, but the boiler and high-pressure cylinder require modification. Operation mode 3 is used as an example to analyze the effect of the solvent regeneration heat duty and temperature on the performance of the power plant. A decrease in heat duty is found to increase the system thermal efficiency and reduce the coal consumption rate and energy penalty. Lowering regeneration temperature while keeping the heat duty unchanged will improve the thermal efficiency of the system and reduce the coal consumption rate and energy penalty.

ACS Style

Rongrong Zhai; Hai Yu; Lingjie Feng; Ying Chen; Kangkang Li; Yongping Yang. Integration of a Coal-Fired Power Plant with an Ammonia-Based CO2 Capture Process in Three Operation Modes. Energy & Fuels 2018, 32, 10760 -10772.

AMA Style

Rongrong Zhai, Hai Yu, Lingjie Feng, Ying Chen, Kangkang Li, Yongping Yang. Integration of a Coal-Fired Power Plant with an Ammonia-Based CO2 Capture Process in Three Operation Modes. Energy & Fuels. 2018; 32 (10):10760-10772.

Chicago/Turabian Style

Rongrong Zhai; Hai Yu; Lingjie Feng; Ying Chen; Kangkang Li; Yongping Yang. 2018. "Integration of a Coal-Fired Power Plant with an Ammonia-Based CO2 Capture Process in Three Operation Modes." Energy & Fuels 32, no. 10: 10760-10772.

Journal article
Published: 01 September 2018 in Energy Conversion and Management
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A Solar Tower Aided Coal-fired Power (STACP) system utilizes a solar tower coupled to a conventional coal-fired power system to reduce pollutants, greenhouse gas emissions and the investment of solar energy facilities. This paper examines three different schemes for integrating solar energy into a conventional boiler. For each scheme, an energy and exergy analysis of a 600 MWe supercritical coal-fired power system is combined with 53 MWth of solar energy in both a fuel saving mode and a power boosting mode. The results show that, for all these integration schemes, the boiler’s efficiency and system’s efficiency are reduced. However, the standard coal consumption rate is lower in comparison to conventional power plants and the standard coal consumption rate in the fuel saving mode is lower than that in the power boosting mode for all three schemes. Comprehensively considering both the standard coal consumption rate and efficiency, the scheme that uses solar energy to heat superheat steam and subcooled feed-water is the best integration option. Compared with a coal-fired only system, the saved standard coal consumption rate of the above mentioned scheme in fuel saving mode and power boosting mode can reach up to 11.15 g/kWh and 11.11 g/kWh, respectively. Exergy analysis shows, for STACP system, exergy losses of boiler and solar field contribute over 88% of whole system’s exergy loss.

ACS Style

Chao Li; Rongrong Zhai; Yongping Yang; Kumar Patchigolla; John E. Oakey. Thermal performance of different integration schemes for a solar tower aided coal-fired power system. Energy Conversion and Management 2018, 171, 1237 -1245.

AMA Style

Chao Li, Rongrong Zhai, Yongping Yang, Kumar Patchigolla, John E. Oakey. Thermal performance of different integration schemes for a solar tower aided coal-fired power system. Energy Conversion and Management. 2018; 171 ():1237-1245.

Chicago/Turabian Style

Chao Li; Rongrong Zhai; Yongping Yang; Kumar Patchigolla; John E. Oakey. 2018. "Thermal performance of different integration schemes for a solar tower aided coal-fired power system." Energy Conversion and Management 171, no. : 1237-1245.

Journal article
Published: 25 August 2018 in Energy
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Solar aided coal-fired power system has been proven to be a promising way to utilise solar energy in large scale. In this paper, the performances of the solar tower aided coal-fired power (STACP) system at 100% load, 75% load, and 50% load for different days are investigated and the maximum solar power that the boiler can absorb under different plant loads are explored. Then, the effects of solar multiple (SM) and the thermal energy storage (TES) hour on the daily performance of STACP system are investigated. Results show that the maximum solar power that a 600 MWe boiler can absorb at 100% load, 75% load and 50% load are 76.4 MWth, 54.2 MWth and 23.0 MWth, respectively. Due to the augmented energy from the solar field, the maximum standard coal consumption rate is reduced by 13.53 g/kWh, 12.81 g/kWh and 8.22 g/kWh at 100% load, 75% load and 50% load, respectively. With an increase of solar power input, the boiler efficiency, overall system efficiency and solar thermal-to-electricity efficiency show a downward trend. In addition, the daily coal consumption of summer solstice is the lowest while the winter solstice is the highest for a particular SM and TES hour.

ACS Style

Chao Li; Zhiping Yang; Rongrong Zhai; Yongping Yang; Kumar Patchigolla; John E. Oakey. Off-design thermodynamic performances of a solar tower aided coal-fired power plant for different solar multiples with thermal energy storage. Energy 2018, 163, 956 -968.

AMA Style

Chao Li, Zhiping Yang, Rongrong Zhai, Yongping Yang, Kumar Patchigolla, John E. Oakey. Off-design thermodynamic performances of a solar tower aided coal-fired power plant for different solar multiples with thermal energy storage. Energy. 2018; 163 ():956-968.

Chicago/Turabian Style

Chao Li; Zhiping Yang; Rongrong Zhai; Yongping Yang; Kumar Patchigolla; John E. Oakey. 2018. "Off-design thermodynamic performances of a solar tower aided coal-fired power plant for different solar multiples with thermal energy storage." Energy 163, no. : 956-968.

Journal article
Published: 17 May 2018 in Energies
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Installing CO2 capture plants in coal-fired power stations will reduce greenhouse gas emissions and help mitigate climate change. However, the deployment of this technology faces many obstacles—in particular, high energy consumption. Aiming to address this challenge, we investigated the integration of a solar energy system in a 1000 MW coal-fired power plant equipped with monoethanolamine (MEA)-based CO2 capture (termed PG-CC) by comparing the thermo-economic performance of two integrated systems with that of PG-CC. In the first system, solar-aided coal-fired power generation equipped with MEA-based CO2 capture (SA-PG-CC), solar thermal was used to heat the high-pressure feed water in the power plant, while the reboiler duty of the capture plant’s stripper was provided by extracted low-pressure steam from the power plant. The second system integrated the power plant with solar-aided MEA-based CO2 capture (SA-CC-PG), using solar thermal to heat the stripper’s reboiler. Both systems were simulated in EBSILON Professional and Aspen Plus and analysed using thermo-economics theory. We then evaluated each system’s thermodynamic and economic performance in terms of power generation and CO2 capture. Compared with PG-CC, the thermo-economic cost of electricity increased by 12.71% in SA-PG-CC and decreased by 9.77% in SA-CC-PG. The unit thermo-economic cost of CO2 was similar in both the PG-CC and SA-PG-CC systems, but significantly greater in SA-CC-PG. Overall, SA-PG-CC produced less power but used energy more effectively than SA-CC-PG. From a thermo-economic point of view, SA-PG-CC is therefore a better choice than SA-CC-PG.

ACS Style

Rongrong Zhai; Hongtao Liu; Hao Wu; Hai Yu; Yongping Yang. Analysis of Integration of MEA-Based CO2 Capture and Solar Energy System for Coal-Based Power Plants Based on Thermo-Economic Structural Theory. Energies 2018, 11, 1284 .

AMA Style

Rongrong Zhai, Hongtao Liu, Hao Wu, Hai Yu, Yongping Yang. Analysis of Integration of MEA-Based CO2 Capture and Solar Energy System for Coal-Based Power Plants Based on Thermo-Economic Structural Theory. Energies. 2018; 11 (5):1284.

Chicago/Turabian Style

Rongrong Zhai; Hongtao Liu; Hao Wu; Hai Yu; Yongping Yang. 2018. "Analysis of Integration of MEA-Based CO2 Capture and Solar Energy System for Coal-Based Power Plants Based on Thermo-Economic Structural Theory." Energies 11, no. 5: 1284.

Journal article
Published: 01 December 2017 in Energy Conversion and Management
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ACS Style

Rongrong Zhai; Hongtao Liu; Ying Chen; Hao Wu; Yongping Yang. The daily and annual technical-economic analysis of the thermal storage PV-CSP system in two dispatch strategies. Energy Conversion and Management 2017, 154, 56 -67.

AMA Style

Rongrong Zhai, Hongtao Liu, Ying Chen, Hao Wu, Yongping Yang. The daily and annual technical-economic analysis of the thermal storage PV-CSP system in two dispatch strategies. Energy Conversion and Management. 2017; 154 ():56-67.

Chicago/Turabian Style

Rongrong Zhai; Hongtao Liu; Ying Chen; Hao Wu; Yongping Yang. 2017. "The daily and annual technical-economic analysis of the thermal storage PV-CSP system in two dispatch strategies." Energy Conversion and Management 154, no. : 56-67.

Journal article
Published: 21 November 2017 in Energies
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Of all the renewable power generation technologies, solar tower power system is expected to be the most promising technology that is capable of large-scale electricity production. However, the optimization of heliostat field layout is a complicated process, in which thousands of heliostats have to be considered for any heliostat field optimization process. Therefore, in this paper, in order to optimize the heliostat field to obtain the highest energy collected per unit cost (ECUC), a mathematical model of a heliostat field and a hybrid algorithm combining particle swarm optimization algorithm and genetic algorithm (PSO-GA) are coded in Matlab and the heliostat field in Lhasa is investigated as an example. The results show that, after optimization, the annual efficiency of the heliostat field increases by approximately six percentage points, and the ECUC increases from 12.50 MJ/USD to 12.97 MJ/USD, increased about 3.8%. Studies on the key parameters indicate that: for un-optimized filed, ECUC first peaks and then decline with the increase of the number of heliostats in the first row of the field (Nhel1). By contrast, for optimized field, ECUC increases with Nhel1. What is more, for both the un-optimized and optimized field, ECUC increases with tower height and decreases with the cost of heliostat mirror collector.

ACS Style

Chao Li; Rongrong Zhai; Yongping Yang. Optimization of a Heliostat Field Layout on Annual Basis Using a Hybrid Algorithm Combining Particle Swarm Optimization Algorithm and Genetic Algorithm. Energies 2017, 10, 1924 .

AMA Style

Chao Li, Rongrong Zhai, Yongping Yang. Optimization of a Heliostat Field Layout on Annual Basis Using a Hybrid Algorithm Combining Particle Swarm Optimization Algorithm and Genetic Algorithm. Energies. 2017; 10 (11):1924.

Chicago/Turabian Style

Chao Li; Rongrong Zhai; Yongping Yang. 2017. "Optimization of a Heliostat Field Layout on Annual Basis Using a Hybrid Algorithm Combining Particle Swarm Optimization Algorithm and Genetic Algorithm." Energies 10, no. 11: 1924.

Journal article
Published: 01 October 2017 in Applied Thermal Engineering
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ACS Style

Rongrong Zhai; Jiawei Qi; Yong Zhu; Miaomiao Zhao; Yongping Yang. Novel system integrations of 1000 MW coal-fired power plant retrofitted with solar energy and CO2 capture system. Applied Thermal Engineering 2017, 125, 1133 -1145.

AMA Style

Rongrong Zhai, Jiawei Qi, Yong Zhu, Miaomiao Zhao, Yongping Yang. Novel system integrations of 1000 MW coal-fired power plant retrofitted with solar energy and CO2 capture system. Applied Thermal Engineering. 2017; 125 ():1133-1145.

Chicago/Turabian Style

Rongrong Zhai; Jiawei Qi; Yong Zhu; Miaomiao Zhao; Yongping Yang. 2017. "Novel system integrations of 1000 MW coal-fired power plant retrofitted with solar energy and CO2 capture system." Applied Thermal Engineering 125, no. : 1133-1145.

Journal article
Published: 14 September 2017 in Energies
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In this paper, we conduct a techno-economic analysis of a 1000 MWe solar tower aided coal-fired power generation system for the whole life cycle. Firstly, the power output (from coal and solar thermal energy) under variable direct normal irradiance and grid demand are studied. Secondly, a financial assessment is performed, including profits and losses of the plant project. Thirdly, sensitivity analysis is taken on some external factors that can affect the cost or profits and losses of the plant project. The results indicate that the project has high profits with an internal rate of return (IRR) of 8.7%. In addition, the effects of solar tower field cost, power purchase agreement (PPA) price of solar thermal electricity, coal price, and the interest rate of debt on the main criteria decrease gradually. Therefore, it is better to improve solar tower technology first, and then look for low-interest debts from banks to cope with the reduction of PPA price of solar thermal electricity and the increase of coal price. Despite the introduction of solar tower field increasing levelized cost of electricity (LCOE), it contributes to the reduction of CO2 capture cost compared to the case of standard coal-fired power plants.

ACS Style

Yong Zhu; Rongrong Zhai; Yongping Yang; Miguel Angel Reyes-Belmonte. Techno-Economic Analysis of Solar Tower Aided Coal-Fired Power Generation System. Energies 2017, 10, 1392 .

AMA Style

Yong Zhu, Rongrong Zhai, Yongping Yang, Miguel Angel Reyes-Belmonte. Techno-Economic Analysis of Solar Tower Aided Coal-Fired Power Generation System. Energies. 2017; 10 (9):1392.

Chicago/Turabian Style

Yong Zhu; Rongrong Zhai; Yongping Yang; Miguel Angel Reyes-Belmonte. 2017. "Techno-Economic Analysis of Solar Tower Aided Coal-Fired Power Generation System." Energies 10, no. 9: 1392.

Journal article
Published: 01 September 2016 in Applied Thermal Engineering
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ACS Style

Yong Zhu; Rongrong Zhai; Hao Peng; Yongping Yang. Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods. Applied Thermal Engineering 2016, 108, 339 -346.

AMA Style

Yong Zhu, Rongrong Zhai, Hao Peng, Yongping Yang. Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods. Applied Thermal Engineering. 2016; 108 ():339-346.

Chicago/Turabian Style

Yong Zhu; Rongrong Zhai; Hao Peng; Yongping Yang. 2016. "Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods." Applied Thermal Engineering 108, no. : 339-346.