Analysis on Dynamic Characteristics of Solar-aided Coal-Fired Power Generation System under Load Following

doi:10.11930/j.issn.1004-9649.201804066

Abstract

Abstract: Regarding a 600 MW sub-critical solar-aided coal-fired power generation unit, the transient simulation software TRNSYS is used to simulate its operating dynamic characteristics under 100%THA, 75%THA and 50%THA conditions on the summer solstice upon the introduction of the solar energy considering daily solar radiation changes. The results show that the operation of the solar-aided coal-fired power generation system under different operating conditions is affected by solar radiation fluctuations. The change of main parameters is closely related to the flow rate. Specifically, the main steam temperature will go higher with the main steam pressure and flue gas temperature down when the solar-aided system is in operation. The solar-electricity conversion efficiency of the solar-aided system will decrease with the load drop. During the load following process, the introduction of solar energy into boiler will cause main steam temperature to rise such that the dynamic water spray desuperheating measures must be taken to maintain main steam temperature and keep the heat exchange balance between the solar side and the boiler side.

Key words: solar thermal, coal-fired power generation, TRNSYS, load following, dynamic characteristics

CLC Number:

TK51

LV Peixin, PANG Liping, LI Ming, DUAN Liqiang, YANG Yongping. Analysis on Dynamic Characteristics of Solar-aided Coal-Fired Power Generation System under Load Following[J]. Electric Power, 2019, 52(7): 108-116.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201804066

https://www.electricpower.com.cn/EN/Y2019/V52/I7/108

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