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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN 印刷: 2150-3621
ISSN オンライン: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.2018025381
pages 303-322

THERMO-ECONOMIC ANALYSIS OF ORGANIC RANKINE CYCLE (ORC) WITH CO2 CAPTURE SYSTEM FOR COAL-FIRED POWER PLANT WASTE HEAT RECOVERY

Li Zhang
College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
Zhen Pan
College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
Liyan Shang
College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China
Liang Dong
College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

要約

The thermo-economic performance of a coal-fired power plant combined with CO2 capture system is studied with different configurations of organic Rankine cycle (ORC) systems. The liquefied natural gas (LNG) cold energy is used to assist carbon capture, due to which the CO2 compressor can be omitted. The effects of turbine inlet temperature, mass flow rate and different working fluids on the energy, exergy efficiency, and CO2 capture quantity are investigated. The studied results show that the reductions of the turbine inlet temperature and mass flow rate have a beneficial effect on the thermodynamic performance of the system and CO2 capture quantity of a coal-fired power plant. Although the addition of a regenerator to ORC can reduce the exergy loss of condensers, the power generation and exergy efficiency of simple cycle (S-ORC) are higher than that of recuperated cycle (Rec-ORC). Ethane/ethylene and isopentane/propane are the best working fluid combinations of dual-fluids cycle (DF-ORC) and cascade cycle (Cas-ORC), respectively. The process of DF-ORC and Cas-ORC are more complex, resulting in a greater capital cost of investment. However, the temperature matching performance between the heat and cold source of heat exchangers in the combined system is higher than a single cycle, so the capital cost of the heat exchanger is lower. The cycle with CO2 capture system increases the capital cost, but the increased power generation is enough to reduce the unit power generation costs of power plants. It is noted that S-ORC system is the most profitable of the four kinds of ORC systems.


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