超临界350 MW循环流化床机组模拟量控制系统及AGC优化  

Optimization of analog control system and AGC for a supercritical 350 MW circulating fluidized bed unit

作　　者：沈乾坤[1] 吴恒运[1] 杨涛 黄彪 沈振宏 岳晓光 SHEN Qiankun;WU Hengyun;YANG Tao;HUANG Biao;SHEN Zhenhong;YUE Xiaoguang(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Anhui Qianyingzi Power Generation Co.,Ltd.,Suzhou 234000,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]安徽钱营孜发电有限公司,安徽宿州234000

出　　处：《热力发电》2020年第5期126-131,共6页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ19-H34)。

摘　　要：安徽钱营孜发电有限公司2号机组模拟量控制系统优化前,在稳态工况下,机组主蒸汽压力偏差大且主蒸汽压力控制收敛较慢,同时存在中低负荷段主蒸汽温度达不到额定温度问题;变负荷工况下,主蒸汽压力偏差大,给水自动跟踪差;在高负荷段,由于煤泥的投入,机组主要参数变化更为剧烈,主蒸汽压力超压严重,影响机组安全稳定运行;风烟系统全程无法投入自动,导致机组负荷变化率仅为2 MW/min,不能满足电网相关规定。为了解决2号机组存在的问题,对其主要模拟量控制系统进行优化:修正给水设定曲线、中间点过热度设定曲线;修改氧量控制、一次风量控制及二次风量控制策略,增加变负荷前馈,动态协同进入炉膛的燃料量、给水流量和总风量。优化后,2号机组自动发电控制(AGC)方式下实际负荷变化率达到5.25 MW/min,稳态、变负荷工况下机组主要参数变化平稳。In unit 2 of Anhui Qianyingzi Power Generation Co.,Ltd.,before optimization on the analog control system,the main steam pressure deviation was large and the convergence of main steam pressure control was slow under steady-state condition.Meanwhile,the main steam temperature in the low and medium load section could not reach the rated temperature.Under variable load condition,the main steam pressure deviation was large and the feed water automatic tracking was poor.Under high load condition,due to the input of coal slime,the main parameters of the unit changed more violently,and the overpressure of the main steam pressure was serious,which affected the safe and stable operation of the unit.The whole process of the air and smoke system cannot be put into automatic mode,as a result,the load change rate of the unit was only 2 MW/min,which can not meet the relevant provisions of the power grid.In order to solve the problems existing in unit 2,the main analog control system of the unit was optimized.The water supply setting curve and the superheat setting curve of the intermediate point were modified.The oxygen control,primary air volume control and secondary air volume control strategies were modified.The variable load feed forward was increased,and the fuel volume,water supply flow and total air volume entering the furnace were dynamically coordinated.After optimization,the actual load change rate of unit 2 under AGC mode reached 5.25 MW/min,and the main parameters of the unit changed smoothly under steady-state and variable load conditions.

关 键 词：超临界机组 循环流化床 变负荷 模拟量控制系统 AGC 控制策略 负荷变化率 调峰 

分 类 号：TP272[自动化与计算机技术—检测技术与自动化装置]