FCB工况下的给水控制系统改进与优化  

Improvement and Optimization of Water Supply Control System under FCB Condition

作　　者：王孟 赖艳云 沈春明 丁志强 WANG Meng;LAI Yanyun;SHEN Chunming;DING Zhiqiang(China Energy Group East China Electric Power Test Research Institute Co.,Ltd.,Hangzhou 311022,China;China Energy Group Zhejiang Thermal Power Construction Co.,Ltd.,Hangzhou 310016,China)

机构地区：[1]中国能源建设集团华东电力试验研究院有限公司,浙江杭州311022 [2]中国能源建设集团浙江火电建设有限公司,浙江杭州310016

出　　处：《自动化仪表》2021年第1期42-45,51,共5页Process Automation Instrumentation

摘　　要：针对快速切负荷(FCB)工况下巨大负荷波动对给水系统带来冲击,分析未配置全压电泵的给水系统在FCB工况时的控制难点与要点。对汽源切换方式及控制策略进行相应优化,以维持给水系统正常运行。通过相关试验验证由FCB预备性试验时给水控制系统的响应情况。根据切换阀蒸汽流量计算原理对FCB工况下切换阀开启的开度进行计算定位,进一步优化了给水系统控制策略和汽源切换控制方法,实现了FCB工况时蒸汽汽源的平稳切换。该方法避免了给水流量因蒸汽流量突变而发生大幅度波动,最终达到了预期的控制效果,顺利完成了100%负荷下的FCB试验。该次给水系统控制策略优化的技术总结,对其他同类型机组给水控制系统的设计与优化具有一定的借鉴意义。Aiming at the impact of the huge load fluctuation on the water supply system under fast cut back(FCB)condition,the difficulties and key points of the control of the water supply system without full voltage pump under FCB condition are analyzed.The steam source switching mode and control strategy are optimized to maintain the normal operation of the water supply system.Verify through relevant tests.According to the response of the water supply control system during FCB's preparatory test,the opening of the switching valve under FCB's working condition was calculated and positioned according to the calculation principle of the switching valve steam flow.The control strategy of the water supply system and the control method of steam source switching were further optimized to realize the smooth switching of steam source under FCB's working condition.This method avoids the large fluctuation of water supply flow clue to the sudden change of steam flow,and finally achieves the expected control effect,and successfully completes the FCB test under 100% load.The optimization of the control strategy of the water supply system provides some reference for the design and optimization of the water supply control system of other units of the same type.

关 键 词：给水系统 汽源切换 控制策略 优化 调节阀 

分 类 号：TH-39[机械工程]