摘要
结合亚临界600MW直接空冷机组前后墙对冲燃烧锅炉的特点,总结了机组在快速减负荷(RB)时跳闸磨煤机的组合方案。针对RB动作初期存在的炉膛压力下降过快问题,对常规炉膛压力控制策略进行优化,提出了炉膛压力自适应PID控制算法,使炉膛压力偏差线性化,RB过程中切除积分计算分量,同时在一次风机RB时采用自适应方法计算PID控制器的比例增益。优化后,机组在RB工况下的炉膛压力衰减率最大为80%,过渡时间显著缩短。
Combining with the characteristics of a subcritical 600 MW direct air-cooling unit with opposed wall fired boiler,the mill tripping solutions during the Unit＇s run back （RB） were summa- rized. Against the furnace pressure＇s rapid decline at initial stage of the RB action,optimization on conventional control strategy of the furnace pressure was conducted,and the adaptive PID control algorithm for furnace pressure was proposed. In this algorithm, the furnace pressure deviation is linearized,the integral calculation component is removed during RB, and the regulating propor-tional gain was calculated by adaptive method during the primary air fan＇s RB process. After the optimization,the decay ratio of the furnace pressure reached a maximum of 80 % when the unit is in RB mode, and the transition time was reduced significantly.
出处
《热力发电》
CAS
北大核心
2014年第4期10-14,共5页
Thermal Power Generation
