Extremum analysis based on exergy and economic principle for ejector-absorption cycles combined with regenerative organic-Rankine and gas-turbine cycles

Bhowmick, Amit; Kundu, Balaram

doi:10.1016/j.enconman.2021.115174

Cited by 16 publications

(6 citation statements)

References 54 publications

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“…Water from the waste heat boiler is used as a heat carrier for overheating and evaporation in a low-pressure turbine. The parameters of the working medium at the inlet to the active nozzle of LVE are t p1 = 104 °С, p p1 = 1.6⋅10 5 Pa. Pressure at the outlet of the ejector is diffe rent and depends on the design of the scheme. For a scheme based on LVE, it is p out = 1⋅10 5 Pa, for the LVE+LRVP scheme -p out = 0.8⋅10 5 Pa. A vapor-air mixture pressure at the inlet to LVE p s1 = 0.17⋅10 3 Pa.…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

“…The authors of [4,5] conducted theoretical and practical studies that showed that the maximum efficiency of steam-jet ejectors has already been achieved and cannot be increased. In [6], it is noted that in order to improve the condensation process in steam-gas plants, it is necessary to search for new, alternative devices that would be more efficient and economical than steam jets.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Sharapov

Yevtushenko

Панченко

et al. 2022

EEJET

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This paper considers the possibility of using liquid-vapor ejectors in condensing units of steam turbines. This unit is designed for pumping out a steam-air mixture from a steam turbine condenser, in which the process occurs at a pressure lower than atmospheric. In the traditional scheme, this is provided by a two-stage steam-jet ejector unit. The proposed scheme involves the use of a single-stage liquid-vapor ejector and its possible pre-vacuum mode of operation in conjunction with a liquid-ring vacuum pump. A working process of the liquid-vapor ejector does not require the supply of working steam from the outside since its generation occurs in the active nozzle of the liquid-vapor ejector. A description of the traditional scheme and the proposed options is given, which are different both in the scheme solution and in the operating parameters. The object of this study is a liquid-vapor ejector, which is used in the condensing system of a steam turbine. Thermodynamic calculation of the proposed circuit solutions was carried out. As a result, the necessary mode parameters of the schemes were determined. To assess the feasibility of using a liquid-vapor ejector in the condensation systems of steam turbines, an exergy analysis was performed. The proposed scheme makes it possible to increase efficiency by 2.3 times, and when used with a liquid-ring vacuum pump – by 2.44 times. To assess the economic efficiency of the modernization of the condensing system, thermoeconomic analysis was performed. The use of the proposed scheme makes it possible to reduce the cost of generating boiler steam and reduce the cost of the resulting product of the steam turbine unit by about 51 %. The estimated cost of a unit of the amount of boiler steam consumed per ton of product and the unit cost of steam were established.

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Section: The Study Materials and Methodsmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Sharapov

Yevtushenko

Панченко

et al. 2022

EEJET

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“…Finally, instead of using the expansion valve and compressor (Comp), an ejector (EJC) has been employed. According to the literature [ 60 ], using an EJC can significantly reduce energy consumption and losses. Besides that, the produced electrical energy can meet the electrical requirements of all the installed electric equipment in the proposed energy system.…”

Section: Performance Description and Modelingmentioning

confidence: 99%

Cost and environmental analysis and optimization of a new and green three-level waste heat recovery-based cogeneration cycle: A comparative study

Nikafshan Rad,

Ghasemi,

Marefati

2024

Heliyon

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“…In another research, a cooling and power generation system composed of a gas turbine, heat recovery steam generators (HRSG), regenerative organic Rankine cycle (ORC), and ejector absorption refrigeration cycle has been studied. 16 The result of exergy analysis revealed that the combustion chamber of the gas turbine (GT) indicated the highest exergy destruction ratio (45.81%) and lowest exergoeconomic factor (0.0051). Overall exergy efficiency and total product cost of the system in its optimum condition are 44.2% and 54.84 $/GJ, respectively.…”

Section: Multigeneration Systemsmentioning

confidence: 99%

“…Exergy analysis indicates that reactors have the highest exergy destruction rate among the system's components (57.3% of total). In another research, a cooling and power generation system composed of a gas turbine, heat recovery steam generators (HRSG), regenerative organic Rankine cycle (ORC), and ejector absorption refrigeration cycle has been studied 16 . The result of exergy analysis revealed that the combustion chamber of the gas turbine (GT) indicated the highest exergy destruction ratio (45.81%) and lowest exergoeconomic factor (0.0051).…”

Section: Introductionmentioning

confidence: 99%

Conceptual design and energy, economic and environmental ( 3E ) analysis of a natural gas‐based integrated system with reduced CO ₂ emission for multigeneration of electricity, freshwater, syngas, and oxygen

Fadaei

Aslani

Senani

et al. 2022

Intl J of Energy Research

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Summary This study proposes a novel multigeneration system consisting of a gas turbine cycle, multi‐effect desalination (MED), mono ethanolamine‐based post‐combustion carbon capture, and a co‐electrolysis unit. The designed multigeneration system aims to produce electricity, freshwater, syngas, and oxygen. This study considers two main configurations, namely base and advanced cases. In addition, the advanced configuration is simulated for three scenarios of carbon utilization and absorption efficiencies of 85%,90%, and 95% in the capture unit. The system is analyzed from energy, environmental, and economic points of view to ascertain the feasibility of each scenario. The scenarios include (i) transferring all captured carbon dioxide to a co‐electrolysis unit, (ii) delivering 30% of captured carbon dioxide to a co‐electrolysis unit and storing the rest, and (iii) storing all captured carbon dioxide. According to the results, the advanced system, compared with the base case, has 26.27% higher energy efficiency and 8.01% higher carbon dioxide capture efficiency besides 42% lower water consumption. The first scenario performs better in oxygen and syngas production (44.46 and 33.51 kg/s). In contrast, the third scenario is the most promising, considering energy and carbon dioxide capture efficiency (83.72% and 76.61%) and net electricity generation (327.97 MW). Moreover, the third scenario demonstrated the best economic feasibility with the prime cost of electricity equal to 0.02 US$/kWh and a period of return of about 1.1 years. The results confirm that the proposed multigeneration system is capable of producing multiple useful and affordable products while minimizing the CO2 emission to the atmosphere.

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Extremum analysis based on exergy and economic principle for ejector-absorption cycles combined with regenerative organic-Rankine and gas-turbine cycles

Cited by 16 publications

References 54 publications

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Cost and environmental analysis and optimization of a new and green three-level waste heat recovery-based cogeneration cycle: A comparative study

Conceptual design and energy, economic and environmental ( 3E ) analysis of a natural gas‐based integrated system with reduced CO ₂ emission for multigeneration of electricity, freshwater, syngas, and oxygen

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Extremum analysis based on exergy and economic principle for ejector-absorption cycles combined with regenerative organic-Rankine and gas-turbine cycles

Cited by 16 publications

References 54 publications

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector

Cost and environmental analysis and optimization of a new and green three-level waste heat recovery-based cogeneration cycle: A comparative study

Conceptual design and energy, economic and environmental ( 3E ) analysis of a natural gas‐based integrated system with reduced CO 2 emission for multigeneration of electricity, freshwater, syngas, and oxygen

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Product

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Conceptual design and energy, economic and environmental ( 3E ) analysis of a natural gas‐based integrated system with reduced CO ₂ emission for multigeneration of electricity, freshwater, syngas, and oxygen