600MW超临界“W”型锅炉机组主蒸汽温度低的分析及处理  

Abnormality analysis and countermeasure on lower main steam temperature of 600 MW supercritical W-flame boiler

作　　者：黄伟[1] 寻新[1] 刘复平[1] 邹自敏 张建玲[1] 彭敏[1] 

机构地区：[1]湖南省电力公司试验研究院,湖南长沙410007 [2]大唐华银金竹山火力发电分公司,湖南冷水江417505

出　　处：《中国电力》2010年第10期31-34,共4页Electric Power

摘　　要：大唐华银金竹山火力发电分公司3号锅炉是世界首台600 MW超临界燃用无烟煤的"W"型火焰锅炉机组。投运后锅炉在短时间内连续发生5次高负荷、投自动协调时主蒸汽温度低的问题,造成机组被迫降负荷甚至停运。其主要原因为:原给水自动策略以磨煤机入口容量风代表煤量计算煤水比,以汽水分离器出口蒸汽焓值作为修正,而风煤比不确定性和焓值代表性不够,给水自动可靠性不高;实际给水自动控制策略选择汽水分离器出口温度作为控制对象,反映比较缓慢,易误判。通过优化现有给水控制策略,在逻辑中设定不同负荷下的给水流量和水冷壁壁温控制值,当启停制粉系统时增加电负荷前馈、减弱煤水比前馈,以及规范操作等措施,解决了这一问题。The 3th boiler of Datang Huayin Jinzhushan Thermal Power Co.,Ltd. is the first 600 MW W-shaped flame boiler that firing anthracite in the world. The low main steam temperature of boiler has taken place five times in succession in short period under high load and automatically coordinated control, which not only makes unit decreasing load, even abnormal outage, but also threats safe operation of boiler. The main reason for this subnormal pressure is that the original design on feed water control strategy uses the inlet air volume of pulverizer instead of coal to calculate coal-water ratio, and uses the outlet steam enthalpy value of steam-water-separator to modify coal-water ratio, but the air-water ratio is uncertain, the enthalpy is inadequate to represent, and the feed water is low reliable, the exports temperature of steam-water-separator is chose to be the control plant in practical feed water control strategy, which reflects slowly and unable to accurately and timely reflect and judge the superheat of main steam temperature. By optimizing existing feed water control strategy, setting different control values for feed-water flow and temperature of water wall under different loads in control logic, increasing electrical load feed forward and decreasing coal-water ratio feed forward during the start-up and shut-down of milling system, and standardizing operation etc, the problem is solved.

关 键 词：600MW超临界机组 "W"型火焰锅炉 主蒸汽温度 给水自动控制 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]