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

Unclaimed
Tomasz Włodek
Drilling, Oil and Gas Faculty, AGH University of Science and Technology, PL30059 Krakow, Poland

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: 26 September 2020 in Energies
Reads 0
Downloads 0

The one of main quality requirements of natural gas as an engine fuel is the methane number (MN). This parameter indicates the fuel’s capability to avoid knocking in the engine. A higher MN value indicates a better natural gas quality for gas engines. Natural gas with higher methane content tends to have higher MN value. This study presents analysis of deviation of liquefied natural gas (LNG) composition and its impact on LNG quality as an engine fuel. The analysis of higher hydrocarbons and nitrogen content impact on LNG parameters was considered for several samples of LNG compositions. Most engine manufacturers want to set a new, lower limit value for methane number at 80. This fact causes significant restrictions on the range of variability in the composition of liquefied natural gas. The goal of this study was to determine the combination of the limit content of individual components in liquefied natural gas to achieve the strict methane number criterion (MN > 80). To fulfill this criterion, the methane content in LNG would have to exceed 93.7%mol, and a significant part of the LNG available on the market does not meet these requirements. The analysis also indicated that the methane number cannot be the only qualitative criterion, as its variability depends strongly on the LNG composition. To determine the applicability of LNG as an engine fuel, the simultaneous application of the methane number and Wobbe index criteria was proposed.

ACS Style

Szymon Kuczyński; Mariusz Łaciak; Adam Szurlej; Tomasz Włodek. Impact of Liquefied Natural Gas Composition Changes on Methane Number as a Fuel Quality Requirement. Energies 2020, 13, 5060 .

AMA Style

Szymon Kuczyński, Mariusz Łaciak, Adam Szurlej, Tomasz Włodek. Impact of Liquefied Natural Gas Composition Changes on Methane Number as a Fuel Quality Requirement. Energies. 2020; 13 (19):5060.

Chicago/Turabian Style

Szymon Kuczyński; Mariusz Łaciak; Adam Szurlej; Tomasz Włodek. 2020. "Impact of Liquefied Natural Gas Composition Changes on Methane Number as a Fuel Quality Requirement." Energies 13, no. 19: 5060.

Journal article
Published: 13 May 2020 in Energies
Reads 0
Downloads 0

Heat losses caused by the operation of compressor units are a key problem in the energy efficiency improvement of the natural gas compression station operation. Currently, waste heat recovery technologies are expensive and have low efficiency. One of these technologies is organic Rankine cycle (ORC) which is often analyzed in scientific works. In this paper, the authors decided to investigate another technology that allows for the usage of the exhaust waste energy—the supercritical Brayton cycle with CO2 (S-CO2). With a thermodynamic model development of S-CO2, the authors preformed a case study of the potential S-CO2 system at the gas compressor station with the reciprocating engines. By comparing the values of selected S-CO2 efficiency indicators with ORC efficiency indicators at the same natural gas compression station, the authors tried to determine which technology would be better to use at the considered installation. Investigations on parameter change impacts on the system operation (e.g., turbine inlet pressure or exhaust gas cooling temperatures) allowed to determine the direction for further analysis of the S-CO2 usage at the gas compressor station. When waste heat management is considered, priority should be given to its maximum recovery and cost-effectiveness.

ACS Style

Rafał Kowalski; Szymon Kuczyński; Mariusz Łaciak; Adam Szurlej; Tomasz Włodek. A Case Study of the Supercritical CO2-Brayton Cycle at a Natural Gas Compression Station. Energies 2020, 13, 2447 .

AMA Style

Rafał Kowalski, Szymon Kuczyński, Mariusz Łaciak, Adam Szurlej, Tomasz Włodek. A Case Study of the Supercritical CO2-Brayton Cycle at a Natural Gas Compression Station. Energies. 2020; 13 (10):2447.

Chicago/Turabian Style

Rafał Kowalski; Szymon Kuczyński; Mariusz Łaciak; Adam Szurlej; Tomasz Włodek. 2020. "A Case Study of the Supercritical CO2-Brayton Cycle at a Natural Gas Compression Station." Energies 13, no. 10: 2447.

Journal article
Published: 05 November 2019 in Journal of Loss Prevention in the Process Industries
Reads 0
Downloads 0

Maintaining the reliability of a transmission system's operation is an extremely important issue in the context of ensuring the continuity of gas delivery to customers. Threats to maintaining the reliability of a transmission system's operation may appear at any stage of transmission, and the most common reasons for this are corrosion, material defects or accidental damage. The paper presents the impact of flood water on transmission valves in the context of possible threats to ensuring the technical safety of gas supplies. Hazards are described which relate to the chemical composition of flood water, which may cause corrosion of valve elements and risk of loss of gas pipeline stability caused by flooding. In the context of the design of a natural gas transmission network, the strength aspects and the phenomenon of corrosion are described. The results of tests related to a specific example are presented. The finite element method (FEM) is used to build ball valve models. Two types of valves are modelled for nominal pipeline diameters of 50 mm (DN50) and 200 mm (DN200). The results of the presented analysis show that the leak tightness of the tested valve flange connections was mainly influenced by changes in their operating conditions because the occurring additional forces and moments caused significant changes in the load balance of the flange connections.

ACS Style

Mariusz Łaciak; Tomasz Włodek; Tomasz Kozakiewicz; Krystian Liszka; Łaciak Mariusz; Włodek Tomasz; Kozakiewicz Tomasz; Liszka Krystian. Impact of flood water on the technical condition of natural gas transmission pipeline valves. Journal of Loss Prevention in the Process Industries 2019, 63, 103998 .

AMA Style

Mariusz Łaciak, Tomasz Włodek, Tomasz Kozakiewicz, Krystian Liszka, Łaciak Mariusz, Włodek Tomasz, Kozakiewicz Tomasz, Liszka Krystian. Impact of flood water on the technical condition of natural gas transmission pipeline valves. Journal of Loss Prevention in the Process Industries. 2019; 63 ():103998.

Chicago/Turabian Style

Mariusz Łaciak; Tomasz Włodek; Tomasz Kozakiewicz; Krystian Liszka; Łaciak Mariusz; Włodek Tomasz; Kozakiewicz Tomasz; Liszka Krystian. 2019. "Impact of flood water on the technical condition of natural gas transmission pipeline valves." Journal of Loss Prevention in the Process Industries 63, no. : 103998.

Journal article
Published: 24 February 2019 in Energies
Reads 0
Downloads 0

During the natural gas pipeline transportation process, gas stream pressure is reduced at natural gas regulation stations (GRS). Natural gas pressure reduction is accompanied by energy dissipation which results in irreversible exergy losses in the gas stream. Energy loss depends on the thermodynamic parameters of the natural gas stream on inlet and outlet gas pressure regulation and metering stations. Recovered energy can be used for electricity generation when the pressure regulator is replaced with an expander to drive electric energy generation. To ensure the correct operation of the system, the natural gas stream should be heated, on inlet to expander. This temperature should be higher than the gas stream during choking in the pressure regulator. The purpose of this research was to investigate GRS operational parameters which influence the efficiency of the gas expansion process and to determine selection criteria for a cost-effective application of turboexpanders at selected GRS, instead of pressure regulators. The main novelty presented in this paper shows investigation on discounted payback period (DPP) equation which depends on the annual average natural gas flow rate through the analyzed GRS, average annual level of gas expansion, average annual natural gas purchase price, average annual produced electrical energy sale price and CAPEX.

ACS Style

Szymon Kuczyński; Mariusz Łaciak; Andrzej Olijnyk; Adam Szurlej; Tomasz Włodek. Techno-Economic Assessment of Turboexpander Application at Natural Gas Regulation Stations. Energies 2019, 12, 755 .

AMA Style

Szymon Kuczyński, Mariusz Łaciak, Andrzej Olijnyk, Adam Szurlej, Tomasz Włodek. Techno-Economic Assessment of Turboexpander Application at Natural Gas Regulation Stations. Energies. 2019; 12 (4):755.

Chicago/Turabian Style

Szymon Kuczyński; Mariusz Łaciak; Andrzej Olijnyk; Adam Szurlej; Tomasz Włodek. 2019. "Techno-Economic Assessment of Turboexpander Application at Natural Gas Regulation Stations." Energies 12, no. 4: 755.

Journal article
Published: 12 February 2019 in Energies
Reads 0
Downloads 0

The use of hydrogen as a non-emission energy carrier is important for the innovative development of the power-generation industry. Transmission pipelines are the most efficient and economic method of transporting large quantities of hydrogen in a number of variants. A comprehensive hydraulic analysis of hydrogen transmission at a mass flow rate of 0.3 to 3.0 kg/s (volume flow rates from 12,000 Nm3/h to 120,000 Nm3/h) was performed. The methodology was based on flow simulation in a pipeline for assumed boundary conditions as well as modeling of fluid thermodynamic parameters for pure hydrogen and its mixtures with methane. The assumed outlet pressure was 24 bar (g). The pipeline diameter and required inlet pressure were calculated for these parameters. The change in temperature was analyzed as a function of the pipeline length for a given real heat transfer model; the assumed temperatures were 5 and 25 °C. The impact of hydrogen on natural gas transmission is another important issue. The performed analysis revealed that the maximum participation of hydrogen in natural gas should not exceed 15%–20%, or it has a negative impact on natural gas quality. In the case of a mixture of 85% methane and 15% hydrogen, the required outlet pressure is 10% lower than for pure methane. The obtained results present various possibilities of pipeline transmission of hydrogen at large distances. Moreover, the changes in basic thermodynamic parameters have been presented as a function of pipeline length for the adopted assumptions.

ACS Style

Szymon Kuczyński; Mariusz Łaciak; Andrzej Olijnyk; Adam Szurlej; Tomasz Włodek. Thermodynamic and Technical Issues of Hydrogen and Methane-Hydrogen Mixtures Pipeline Transmission. Energies 2019, 12, 569 .

AMA Style

Szymon Kuczyński, Mariusz Łaciak, Andrzej Olijnyk, Adam Szurlej, Tomasz Włodek. Thermodynamic and Technical Issues of Hydrogen and Methane-Hydrogen Mixtures Pipeline Transmission. Energies. 2019; 12 (3):569.

Chicago/Turabian Style

Szymon Kuczyński; Mariusz Łaciak; Andrzej Olijnyk; Adam Szurlej; Tomasz Włodek. 2019. "Thermodynamic and Technical Issues of Hydrogen and Methane-Hydrogen Mixtures Pipeline Transmission." Energies 12, no. 3: 569.

Conference paper
Published: 23 January 2019 in IOP Conference Series: Earth and Environmental Science
Reads 0
Downloads 0

Liquefied natural gas (LNG) has an important role in the global industry and energy balance. The use of this energy carrier has been increasing for last decades. The broad development of the LNG sector has been noticeable in the search for new supply directions by natural gas customers. An important option to transport the gas is to convert it into liquid natural gas (LNG) and convey it using insulated LNG tankers. At receiving terminals, the LNG is unloaded into storage tanks and then pumped for the required pressure, vaporized and compressed for final pipeline transmission to natural gas pipeline system. The LNG production process consumes a considerable amount of energy. This energy is stored in LNG as cold energy. At an unloading terminal, LNG is evaporated into gas phase at ambient temperature before pumping into the natural gas transmission system. Seawater or ambient airare commonly used for the regasification process of the LNG. In process of regasification the large part of energy stored in LNG may be recovered and used for electricity generation. In the presented paper a general analysis of the various thermodynamic schemes proposed for power production from regasification has been made. Direct expansion cycle, Rankine cycle and Brayton cycle are analyzed in presented case.

ACS Style

M Łaciak; K Sztekler; A Szurlej; T Włodek. Possibilities of Liquefied Natural Gas (LNG) use for power generation. IOP Conference Series: Earth and Environmental Science 2019, 214, 012138 .

AMA Style

M Łaciak, K Sztekler, A Szurlej, T Włodek. Possibilities of Liquefied Natural Gas (LNG) use for power generation. IOP Conference Series: Earth and Environmental Science. 2019; 214 (1):012138.

Chicago/Turabian Style

M Łaciak; K Sztekler; A Szurlej; T Włodek. 2019. "Possibilities of Liquefied Natural Gas (LNG) use for power generation." IOP Conference Series: Earth and Environmental Science 214, no. 1: 012138.

Conference paper
Published: 23 January 2019 in IOP Conference Series: Earth and Environmental Science
Reads 0
Downloads 0

Liquefied natural gas (LNG) has an increasingly important role in the global natural gas market. Global demand for natural gas will grow over the coming years. LNG is transported by ships to unloading points at the storage terminals. During the LNG storage processes some part of LNG evaporates into gas phase. Evaporated LNG is called Boil-off gas (BOG). LNG is stored at cryogenic temperatures. Heat flow has an impact on evaporation process. It indicates there is continuous boil-off of small fraction or portion of LNG due to warming during storage process. This boil-off gas is generated primarily due to heat flow from the ambient air through tank insulation, unloading and recirculation-line insulation. Vaporization process causes changes in the composition of stored Liquefied Natural Gas. Increased vaporization process may negatively affect the stability and safety of the LNG storage process. Rate of vaporization (boil off rate) should be precisely determined. For these reasons different calculation models to determine the LNG boil-off rate are shown in this paper, also there are presented some boil off rate calculation results for different Liquefied Natural Gas compositions. Obtained results show that Boil-off rate is higher for LNG composition which contains nitrogen. Due to lower bubble temperature nitrogen evaporates first from the LNG, it causes significant LNG density drop in surface layer in storage tank. Difference of densities in surface and bottom layer of stored LNG may cause the stratification process and consequently affect the stability of storage process (possibility of roll-over phenomenon).

ACS Style

T Włodek. Analysis of boil-off rate problem in Liquefied Natural Gas (LNG) receiving terminals. IOP Conference Series: Earth and Environmental Science 2019, 214, 012105 .

AMA Style

T Włodek. Analysis of boil-off rate problem in Liquefied Natural Gas (LNG) receiving terminals. IOP Conference Series: Earth and Environmental Science. 2019; 214 (1):012105.

Chicago/Turabian Style

T Włodek. 2019. "Analysis of boil-off rate problem in Liquefied Natural Gas (LNG) receiving terminals." IOP Conference Series: Earth and Environmental Science 214, no. 1: 012105.