燃煤发电系统热力学特性研究
李杨
（华润电力广东新能源公司，广东 清远 511500）
摘要： 为了解决化石燃料的使用带来的环境问题， 探究了循环燃煤发电系统的热力学特性， 进行了燃烧过程的热力
学分析、热力学循环效率的计算。通过对循环燃煤发电系统的热力学特性进行深入分析， 得出当预压缩机进气压力接近
临界点时， 工质的比热容会急剧增大， 导致工质在低温回热器中的冷却效果变差。为了提高系统的循环效率， 需要根据
实际工况合理选择预压缩机进气压力。对关键设计参数进行全局优化后， 部分冷却循环的性能越来越接近再压缩循环的
性能， 再压缩循环的主/再热气温、高压透平入口压力及各部件压降与部分冷却循环保持一致。
关键词： 燃煤发电； 热力学特性； 循环效率
中图分类号： TK123      文献标志码： A      文章编号： 2095-0802-(2023)11-0077-04
Thermodynamic Characteristics of Coal-fired Power Generation System
LI Yang
(China Resources Power Guangdong New Energy Company, Qingyuan 511500, Guangdong, China)
Abstract: In order to solve the environmental problems caused by the use of fossil fuels, this paper explored the thermodynamic
characteristics of the cycle coal-fired power generation system, carried out the thermodynamic analysis of the combustion process,
and the calculation of the thermodynamic cycle efficiency. Through in-depth analysis of the thermodynamic characteristics of the
cycle coal-fired power generation system, the results show that when the inlet pressure of the pre-compressor is close to the
critical point, the specific heat capacity of the working fluid will increase sharply, resulting in a decrease in the cooling effect of
the working fluid in the low-temperature regenerator. In order to improve the cycle efficiency of the system, the inlet pressure of
the pre-compressor needs to be reasonably selected according to the actual working conditions. After global optimization of key
design parameters, the performance of the partial cooling cycle is also getting closer to that of the recompression cycle. The main/
reheat air temperature, high pressure turbine inlet pressure, and pressure drop across components for the recompression cycle are
the same as those for the partial cooling cycle.
Key words: coal-fired power generation; thermodynamic characteristics; cycle efficiency