摘要
以某620MW超临界机组为研究对象,基于机组热平衡图,通过与高加解列工况设计数据对比,建立适合研究加热器异常工况的热力系统变工况计算模型。基于所建立的变工况计算模型研究汽轮机热耗验收工况(turbine heat acceptance,THA)、75%THA和50%THA工况下切除各加热器汽侧和因故隔离加热器正常疏水调门对机组热耗率的影响;以机组热耗率最低为原则,对各加热器发生异常后回热系统的运行方式给出了优化建议;鉴于计算结果显示高压加热器的异常对机组热耗率的影响较大,提出增设高压加热器跨级疏水管道的设计改进方案,变工况计算结果表明增设高压加热器跨级疏水管道可显著降低高压加热器异常工况下机组的热耗率。
A variable condition model based on heat balance diagram which is suitable for investigating abnormal condition of heaters was proposed through comparing the designing data and calculated results for all high pressure heaters out of service condition.The variable condition model was applied to a supercritical 620 MW unit.The effect of step out of heaters and isolation of normal draining control valves of heaters on the heat rate of unit for the condition turbine heat acceptance(THA),75%THA and 50%THA have been investigated.The operating mode of heat regenerative system under the abnormal condition of heaters is optimized employing the principle of minimum heat rate.The calculated results indicate that the abnormity of high pressure heaters has large effect on the heat rate of unit.The optimizing proposal of designing across stage normal draining pipes for high pressure heaters was proposed.The variable condition calculated results indicate that the heat rate of unit under the abnormal condition of high pressure heaters decreases significantly with the design of across stage normal draining pipes.
作者
余兴刚
李旭
陈非
李明
谢诞梅
YU Xinggang;LI Xu;CHEN Fei;LI Ming;XIE Danmei(Hunan Province Key Laboratory of Efficient&Clean Thermal Power Generation Technologies(State Grid Hunan Electric Power Corporation Limited Research Institute),Changsha 410007,Hunan Province,China;HunanXiangdian Test&Research Institute CO.,LTD.,Changsha 410004,Hunan Province,China;School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,Hubei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2019年第22期6648-6655,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(51776142)
湖南省科技创新平台与人才计划项目(2016TP1027)~~
关键词
620MW超临界机组
变工况
加热器异常
热耗率
跨级疏水管道
supercritical 620MW unit
variable condition
abnormal condition of heaters
heat rate
across stage normal draining pipes
