Study on Steam Temperature Regulation Characteristics in Flexible Ultra-supercritical Boiler with Double Reheat Cycle under Wide Loads

doi:10.11930/j.issn.1004-9649.201811131

Abstract

Abstract: A cell-divided model of double-reheat boilers for thermodynamic calculation is established, in which the formula of the gas temperature at the furnace outlet is revised by using the convective heat volume of high temperature heating surfaces in the furnace. The model is validated on a domestic 660 MW double-reheat boiler. Based on this model, the impacts of tilting burners, adjustment of gas dampers and gas recirculation on the steam temperatures are studied, and the characteristic curves of the steam temperature change with respect to various regulating methods are obtained. From the results it turned out that the main steam temperature is more sensitive to gas recirculation. For every 1% jump of the recirculation rate, the main steam temperature drops by 0.8 ℃. Besides, the reheat steam temperatures are more sensitive to gas damper adjustment. For every 1% increase of the damper opening in front flue, the primary-reheat steam temperature rises by 1 ℃, while the secondary-reheat steam temperature drops by 1.7 ℃.

Key words: coal-fired power plant, double-reheat boiler, thermodynamic calculation model, steam temperature characteristics, tilting burners, gas recirculation, gas damper

CLC Number:

TK222

XU Wei, ZHANG Jian, FAN Haojie, ZHANG Zhongxiao, SUN Weiting. Study on Steam Temperature Regulation Characteristics in Flexible Ultra-supercritical Boiler with Double Reheat Cycle under Wide Loads[J]. Electric Power, 2019, 52(4): 119-126.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201811131

https://www.electricpower.com.cn/EN/Y2019/V52/I4/119

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