A novel solar energy integrated low-rank coal fired power generation using coal pre-drying and an absorption heat pump

Cheng Xu, Pu Bai, Tuantuan Xin, Yue Hu, Gang Xu and Yongping Yang

Applied Energy, 2017, vol. 200, issue C, 170-179

Abstract: A novel solar energy integrated low-rank coal (LRC) fired power generation using coal pre-drying and an absorption heat pump (AHP) was proposed. The proposed integrated system efficiently utilizes the solar energy collected from the parabolic trough to drive the AHP to absorb the low-grade waste heat of the steam cycle, achieving larger amount of heat with suitable temperature for coal’s moisture removal prior to the furnace. Through employing the proposed system, the solar energy could be partially converted into the high-grade coal’s heating value and the cold-end losses of the boiler and the steam cycle could be reduced simultaneously, leading to a high-efficient solar energy conversion together with a preferable overall thermal efficiency of the power generation. The results of the detailed thermodynamic and economic analyses showed that, using the proposed integrated concept in a typical 600MW LRC-fired power plant could reduce the raw coal consumption by 4.6kg/s with overall energy and exergy efficiencies improvement of 1.2 and 1.8 percentage points, respectively, as 73.0 MWth solar thermal energy was introduced. The cost of the solar generated electric power could be as low as $0.044/kWh. This work provides an improved concept to further advance the solar energy conversion and utilisation in solar-hybrid coal-fired power generation.

Keywords: Absorption heat pump (AHP); Coal pre-drying; Low-rank coal (LRC); Solar thermal energy; Thermodynamic analysis; Economic analysis (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (28)

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DOI: 10.1016/j.apenergy.2017.05.078

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