高低压旁路供热改造对机组调峰能力的影响分析  

Analysis of the Influence of HP⁃LP Bypass Heat Supply Reformation on Unit′s Peak Shaving Capability

作　　者：董伟 司派友[1] 王维萌[1] 张鹏[2] DONG Wei;SI Pai-you;WANG Wei-meng;ZHANG Peng(North China Electric Power Research Institute Co.,Ltd.,Beijing,China,Post Code:100045;Xi′an Branch of North China Electric Power Research Institute Co.,Ltd.,Xi′an,China,Post Code:710000)

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]华北电力科学研究院有限责任公司西安分公司,陕西西安710000

出　　处：《热能动力工程》2023年第8期169-175,共7页Journal of Engineering for Thermal Energy and Power

基　　金：华北电力科学研究院青年创新项目(KJZ2022004)。

摘　　要：针对现阶段热电联产机组供热期调峰能力不足的问题,以某350 MW超临界燃煤机组为案例,介绍了其高低压旁路供热改造方案,并以改造后机组的实际运行数据为基础,对改造前后机组的运行特性和调峰能力进行了详细的对比分析。结果表明:案例机组进行高低压旁路供热改造后,在保证机组供热期热负荷和热段再热蒸汽流速不超限的情况下,机组电负荷调峰下限可由原来的230.9 MW降至161.4 MW,降低30.1%;当案例机组两个中压调节汽门关至42%时,机组电负荷调峰下限可进一步降至140.8 MW;旁路供热蒸汽量占比可由原来的56.3%提高至61.9%,提高5.6%,机组的调峰能力得到进一步提高。In view of the problem of insufficient peak shaving capacity during the heating period of the cogeneration unit at current stage,the reformation scheme of HP⁃LP bypass system combining with heating in a 350 MW supercritical coal⁃fired unit was introduced.Based on the actual operation data of the unit after the reformation,a detailed comparative analysis of the operating characteristics and peak shaving capabilities of the unit before and after the reformation was carried out.The results show that after the HP⁃LP bypass heat supply reformation,the lower limit of the unit′s electrical load peak regulation can be reduced from 230.9 MW to 161.4 MW with a reduction of 30.1%,by ensuring the heat load of the unit during the heating period is satisfied and the flow rate of reheated steam in hot section do not exceed the limit;when the two middle pressure regulating valves of the case unit are closed to 42%,the lower limit of the unit′s electrical load peak regulation can be further reduced to 140.8 MW;the proportion of bypass heating steam increases from 56.3%to 61.9%with an increase of 5.6%.The peak shaving capacity of the unit has been further improved.

关 键 词：热电联产 高低压旁路供热 调峰能力 运行特性 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]