Thermo-economic analysis, working fluids selection, and cost projection of a precooler-integrated dual-stage combined cycle (PIDSCC) system utilizing cold exergy of liquefied natural gas

Energy ◽  
2022 ◽  
Vol 238 ◽  
pp. 121851
Author(s):  
Siyang Zheng ◽  
Chenghao Li ◽  
Zhiyong Zeng
Keyword(s):  
Natural Gas ◽  
Economic Analysis ◽  
Liquefied Natural Gas ◽  
Combined Cycle ◽  
Working Fluids ◽  
Dual Stage ◽  
Cost Projection

Assessment of LNG Regasification Systems With Cogeneration

2000 ◽  
Author(s):  
Umberto Desideri ◽  
Claudio Belli
Keyword(s):  
Natural Gas ◽  
Economic Analysis ◽  
Power Production ◽  
Liquefied Natural Gas ◽  
Gas Pressure ◽  
Long Distance ◽  
Working Fluids ◽  
Pipeline Networks ◽  
Combined Cycles ◽  
And Performance

Natural gas is usually transferred to consumers through pipelines, which may cover distances of thousands of kilometers. In some cases, however, when the path of the pipelines crosses seas or countries where the politic situation does not ensure a continuous and reliable flow, other means of transportation are preferred. In these cases, the natural gas is liquefied and transported in tankers, which load the tanks at liquefaction plants and discharge them at regasification plants. This gives a considerable chance to differentiate supply sources and allows gas imports from producing countries that are otherwise inaccessible via pipeline. The aim of this paper is the study of systems, which carry out liquefied natural gas (LNG) vaporization using cogenerative solutions. The following configurations were studied in particular: • Gas-steam combined cycles; • Closed gas-gas combined cycles using three different working fluids. Two typical plant sizes and two gas pressure sendout levels (7.3 MPa for long distance pipeline networks and 2.5 MPa for terminals linked to power production plants with combined cycles) have been analyzed. The suggested solutions have been optimized, and performance calculated. The discussion is completed by a simplified economic analysis.

Utilization of Cryogenic Exergy of LNG by MGT (Mirror Gas Turbine)

2000 ◽  
Author(s):  
Y. Tsujikawa ◽  
K. Kaneko ◽  
S. Fujii
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
High Efficiency ◽  
Electric Energy ◽  
Liquefied Natural Gas ◽  
Combined Cycle ◽  
Brayton Cycle ◽  
Exhaust Gas ◽  
Topping Cycle ◽  
Very High

In the course of the worldwide efforts to suppress the global warming, the saving energy becomes more important. Recently, the LNG (liquefied natural gas) terminals in our country have received more than 50 million tons of LNG per year. Therefore, the utilization of the cryogenic exergy in connection with the regasification of LNG gains more and more importance. The aim of this paper is the recovery of the energy consumed in liquefaction using the MGT (Mirror Gas Turbine), which is a kind of new combined cycle of a conventional gas turbine worked as a topping cycle and TG (inverted Brayton cycle) as a bottoming cycle. The optimum characteristics have been calculated and it is shown that this cycle is superior to the current-use gasification systems in employing seawater heats in terms of thermal efficiency and specific output. In the present cycle, the cold of LNG is used to cool the exhaust gas from a turbine of TG, and then the exergy of the liquefied natural gas is transformed to electric energy with a very high efficiency. The main feature of this new concept is the removal of an evaporation system using seawater.

scholarly journals Feasibility study on HYSOL CSP

2016 ◽  
Vol 13 (1) ◽  
Keyword(s):  
Power Generation ◽  
High Temperature ◽  
Natural Gas ◽  
Economic Analysis ◽  
Molten Salt ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Economic Feasibility ◽  
Solar Irradiation ◽  
Firm Power

Concentrating Solar Power (CSP) plants utilize thermal conversion of direct solar irradiation. A trough or tower configuration focuses solar radiation and heats up oil or molten salt that subsequently in high temperature heat exchangers generate steam for power generation. High temperature molten salt can be stored and the stored heat can thus increase the load factor and the usability for a CSP plant, e.g. to cover evening peak demand. In the HYSOL concept (HYbrid SOLar) such configuration is extended further to include a gas turbine fuelled by upgraded biogas or natural gas. The optimised integrated HYSOL concept, therefore, becomes a fully dispatchable (offering firm power) and fully renewable energy source (RES) based power supply alternative, offering CO2-free electricity in regions with sufficient solar resources. The economic feasibility of HYSOL configurations is addressed in this paper. The analysis is performed from a socio- and private- economic perspective. In the socio-economic analysis, the CO2 free HYSOL alternative is discussed relative to conventional reference firm power generation technologies. In particular the HYSOL performance relative to new power plants based on natural gas (NG) such as open cycle or combined cycle gas turbines (OCGT or CCGT) are in focus. In the corporate-economic analysis the focus is on the uncertain technical and economic parameters. The core of the analyses is based on the LCOE economic indicator. In the corporate economic analysis, NPV and IRR are furthermore used to assess the feasibility. The feasibility of renewable based HYSOL power plant configurations attuned to specific electricity consumption patterns in selected regions with promising solar energy potentials are discussed.

scholarly journals A boil-off gas utilization for improved performance of heavy duty gas turbines in combined cycle

2018 ◽  
Vol 233 (1) ◽  
pp. 96-110 ◽  
Author(s):  
Stefano Mazzoni ◽  
Srithar Rajoo ◽  
Alessandro Romagnoli
Keyword(s):  
Heat Transfer ◽  
Natural Gas ◽  
Ambient Temperature ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Liquefied Natural Gas ◽  
Combined Cycle ◽  
Cooling Power ◽  
Heavy Duty ◽  
Cold Energy

The storage of the natural gas under liquid phase is widely adopted and one of the intrinsic phenomena occurring in liquefied natural gas is the so-called boil-off gas; this consists of the regasification of the natural gas due to the ambient temperature and loss of adiabacity in the storage tank. As the boil-off occurs, the so-called cold energy is released to the surrounding environment; such a cold energy could potentially be recovered for several end-uses such as cooling power generation, air separation, air conditioning, dry-ice manufacturing and conditioning of inlet air at the compressor of gas turbine engines. This paper deals with the benefit corresponding to the cooling down of the inlet air temperature to the compressor, by means of internal heat transfer recovery from the liquefied natural gas boil-off gas cold energy availability. The lower the compressor inlet temperature, the higher the gas turbine performance (power and efficiency); the exploitation of the liquefied natural gas boil-off gas cold energy also corresponds to a higher amount of air flow rate entering the cycle which plays in favour of the bottoming heat recovery steam generator and the related steam cycle. Benefit of this solution, in terms of yearly work and gain increase have been established by means of ad hoc developed component models representing heat transfer device (air/boil-off gas) and heavy duty 300 MW gas turbine. For a given ambient temperature variability over a year, the results of the analysis have proven that the increase of electricity production and efficiency due to the boil-off gas cold energy recovery has finally yield a revenue increase of 600,000€/year.

ASSESSING THE POTENTIAL OF KEY EXPORTERS IN THE GLOBAL LIQUEFIED NATURAL GAS MARKET

2020 ◽  
Vol 1 (3) ◽  
pp. 39-48
Author(s):  
A. A. SHCHEGOL’KOVA ◽  
Keyword(s):  
Natural Gas ◽  
Economic Analysis ◽  
Large Scale ◽  
Global Market ◽  
Liquefied Natural Gas ◽  
Transport Infrastructure ◽  
Graphical Methods ◽  
Analysis Calculation ◽  
Key Drivers ◽  
Gas Market

The article provides an analysis of the global market for liquefied natural gas (LNG), which revealed the key drivers of changing market dynamics. The development and prospects of large-scale gas projects of the main LNG exporting countries are shown. The potential of key LNG exporters, prospects for the development of the global LNG market has been assessed. Research and analysis of trends in the global LNG market were carried out using statistical methods of economic analysis: calculation of averages, indices; creation of ranks of dynamics; Summaries, groupings of economic indicators; Graphical methods of research were also used. The article assesses the prospects of Russian producers in the global LNG market from the perspective of diversification and modernization of gas transport infrastructure.

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