超超临界二次再热燃煤发电系统优化设计  

Optimization Design of a New Ultra-Supercritical Double Reheat Coal-fired Power Generation System

作　　者：杨名 段立强[1] 刘庆新 郭喜燕[1] 杨志平[1] YANG Ming;DUAN Li-Qiang;LIU Qing-Xin;GUO Xi-Yan;YANG Zhi-Ping(School of Energy Power and Power Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《工程热物理学报》2020年第9期2119-2128,共10页Journal of Engineering Thermophysics

基　　金：国家重点研发计划项目资助(No.2017YFB0602101);国家自然科学基金创新群体项目资助(No.51821004)。

摘　　要：针对超超临界二次再热机组锅炉?损耗大的问题,本文利用单耗分析方法对某1000 MW超超临界二次再热机组进行全工况分析。根据机组能耗分布情况,对系统进行了优化设计,并对新系统进行热力学计算以及单耗分析,揭示了新系统节能降耗优势和煤耗降低原因。研究结果表明:新系统各工况下发电煤耗均降低1.5 g.kW-1·h-1以上,空气预热器附加煤耗降低是系统发电效率提高的主要原因.另外,由于换热温差的减小,新系统锅炉需要增加0.186倍的受热面积,其中空气预热器需要增加到原系统的1.67倍。In order to solve the problems of huge exergy loss in boiler of ultra-supercritical double reheat unit,in this paper,a typical 1000 WM ultra-supercritical double reheat cycle system is selected as the study case and the whole working condition performances of the system are analyzed by specific consumption analysis method.Based on the energy consumption distribution results of unit,a new system is proposed by optimizing the original system.The new system performance is analyzed by using both energy equilibrium method and specific consumption analysis method in order to reveal the advantages of energy saving and the reasons of the coal consumption reduction of the new system.The results show that the power generation coal consumption rates decrease by more than 1.5 g·kW^-1·h^-1 in the whole working conditions,and the reduction of the additional coal consumption of air preheater is the main reason for the improvement of the power generation efficiency of the new system.In addition,due to the reduction of the heat transfer temperature difference,the boiler heating area of the new system needs to be increased by 0.186 times,and the air preheater area of the new system needs to be increased to 1.67 times of the original air preheater area.

关 键 词：超超临界二次再热机组 系统优化 Ebsilon 热力性能分析 单耗分析 

分 类 号：TK11[动力工程及工程热物理—热能工程]