锅炉燃烧工况异常状态诊断分析

Diagnosis and analysis on abnormal combustion condition of boiler

煤质变差严重影响锅炉的稳定燃烧,燃烧不稳导致炉膛壁温变化大和汽包水位波动大,不但会在锅炉高负荷运行中突然灭火,而且在锅炉正常的停炉过程中也会灭火,造成无法按正常程序停炉。结合结大焦造成被迫停炉除焦事故,对比#1、#2、#4炉的燃烧工况,结合当前煤质变化以及各燃烧器的运行状况,针对燃烧器改造方面遗留问题进行综合分析探讨,找出了#3锅炉燃烧工况异常的原因。

Lowering coal quality will influence the stability of combustion seriously, and unstable combustion causes the significant changes of wall temperature in furnace and water level fluctuation in drum. This will led to the flame out not only during high-load operation, but also in stoppage process, which the unit has to shut-down unnormally because of big block of slag. The combustion conditions of ^#1, ^#2 and ^#4 boiler were compared with that of ^#3 boiler. The questions left over in burner reformation were analyzed and synthesized combining with the change of coal quality and the operation status of each burner. The reason of abnormal combustion condition of ^#3 boiler was finded out.