THERMAL PERFORMANCE ANALYSIS OF SOLAR-AIDED COAL-FIRED POWER GENERATION SYSTEM UNDER TWO TYPICAL OPERATION MODES

Xiao Yanhong; Guo Tian; Yu Tingfang

doi:10.19912/j.0254-0096.tynxb.2022-0031

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (5) : 121-127. DOI: 10.19912/j.0254-0096.tynxb.2022-0031

THERMAL PERFORMANCE ANALYSIS OF SOLAR-AIDED COAL-FIRED POWER GENERATION SYSTEM UNDER TWO TYPICAL OPERATION MODES

Xiao Yanhong, Guo Tian, Yu Tingfang

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Abstract

This work investigated the thermal performance of a 600 MW direct air-cooled power generation system assisted by a parabolic trough solar field. The system was analyzed under two typical operation modes, focusing on solar power generation, solar-to-electric efficiency and saved standard coal consumption. For the established solar-aided coal-fired unit, a new thermal cycle efficiency evaluation index for maximizing the benefit of solar energy utilization was proposed, and the backpressure was optimized accordingly. The results show an improvement in thermal performance after backpressure optimization under different turbine loads. Besides, the influence of ambient temperature on the thermal performance improvement was quantitatively analyzed. The results show that the thermal performance of the unit under the power boosting mode is better. The thermal performance promotion after backpressure optimization in two operation modes is affected by the direct solar irradiance and the turbine load. The improvement of solar-to-electric efficiency, thermal cycle efficiency and saved standard coal consumption increases as the ambient temperature decreases.

Key words

solar energy / coal fired power plant / energy conversion / operation mode / backpressure optimization

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Xiao Yanhong, Guo Tian, Yu Tingfang. THERMAL PERFORMANCE ANALYSIS OF SOLAR-AIDED COAL-FIRED POWER GENERATION SYSTEM UNDER TWO TYPICAL OPERATION MODES[J]. Acta Energiae Solaris Sinica. 2023, 44(5): 121-127 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0031

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