Thermo-economic Analysis of a Blending Coal-fired Power Plant

doi:10.11930/j.issn.1004-9649.201805172

Abstract

Abstract: To improve the thermo-economic performance of the blending coal-fired power plants, this study adopted the unit coal cost as the objective and the coal characteristics as the constraint conditions, developed the models for evaluating the variations of the unit performance, and finally achieved the optimal blend coal ratio. Then the influence of the blending ratio on the boiler efficiency and the main auxiliary equipment power consumption were also analysed. Finally, the cost of using the blending coal was obtained. The results showed that, when the power plant operated with the optimal blending ratio of 0:2:5:3, the price of the blending coal can be reduced by 43 CNY/ton compared to the designed coal. The electricity consumption of the auxiliary equipment is increased by 1123.8 kW, which led to a 0.2% increase in the auxiliary power consumption rate. Also, the boiler efficiency is decreased by 0.5%. These two aspects increased the standard coal consumption rate by 2.4 g/(kW·h). Overall, the fuel cost of unit electricity of the blending coal decreased by 3%, which brought coal cost savings of 18.0 million CNY. This study will provide a reference for evaluation of the integrated performance of the power plants using the blend coals.

Key words: blending combustion, boiler efficiency, auxiliary power rate, coal consumption rate, thermal-economic analysis

CLC Number:

TK16

YAN Xiaokun, JIAO Kaiming, XU Cheng. Thermo-economic Analysis of a Blending Coal-fired Power Plant[J]. Electric Power, 2018, 51(9): 8-14.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201805172

https://www.electricpower.com.cn/EN/Y2018/V51/I9/8

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