CARBON CAPTURE SYSTEM WASTE HEAT UTILIZATION AND INTEGRATED SYSTEM PERFORMANCE EVALUATION OF 660 MW COAL-FIRED POWER UNITS

Dong Zhijian; Ye Xuemin; Song Ruizhe; Li Chunxi

doi:10.19912/j.0254-0096.tynxb.2020-1148

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (7) : 203-211. DOI: 10.19912/j.0254-0096.tynxb.2020-1148

CARBON CAPTURE SYSTEM WASTE HEAT UTILIZATION AND INTEGRATED SYSTEM PERFORMANCE EVALUATION OF 660 MW COAL-FIRED POWER UNITS

Dong Zhijian^1,2, Ye Xuemin^1,2, Song Ruizhe^1,2, Li Chunxi^1,2

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Abstract

Carbon capture and storage （CCS） technology can effectively capture the CO₂ emitted by coal-fired power generation units, but consume large amounts of renewable energy, leading to an efficiency penalty. To promote energy utilization efficiency of coal-fired power generation units, a solar-aided coal-fired power generation system using organic Rankine cycle （ORC） and CCS is proposed, and the parameter sensitivity of the integrated system is conducted with thermodynamic, exergy and economic analysis models. Based on the external fuel exergy matrix model, the influence of the heat ratio of the CO₂ compression process and solar collector to the heat required by the reboiler and the integrated ORC system on the contribution of external fuel exergy, is examined. Results reveal that the thermo-economics of the integrated system is the best and exhibits reasonable irreversibility at the heat ratio of 0.4. After integrating ORC system, the contributions of coal exergy in the boiler, primary and secondary reheat coal exergy to the system products are raised. With increasing heat ratio, the contributions of coal exergy in boiler, primary and secondary reheat coal exergy to carbon capture system products are reduced, whereas the contributions of the exergy of compressed waste heat and solar are raised.

Key words

carbon capture and storage / solar energy / waste heat utilization / CO₂ compression / organic Rankine cycle / exergy contribution of external fuel

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Dong Zhijian, Ye Xuemin, Song Ruizhe, Li Chunxi. CARBON CAPTURE SYSTEM WASTE HEAT UTILIZATION AND INTEGRATED SYSTEM PERFORMANCE EVALUATION OF 660 MW COAL-FIRED POWER UNITS[J]. Acta Energiae Solaris Sinica. 2022, 43(7): 203-211 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1148

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