大型W火焰锅炉灭火原因分析及对策

Cause Analysis and Countermeasures on flame failure for a W-shaped Flame Boiler

华润电力(涟源)有限公司一期工程1号300MW"W"火焰锅炉在首次带至300MW负荷、首次对锅炉炉膛吹灰时,炉膛负压波动大,瞬间达到-3000Pa,造成锅炉负压保护动作。对锅炉进行了简单介绍,分析了锅炉灭火的主要原因,主要为:燃用煤质变化大;燃烧配风不合理,燃烧不稳,锅炉抗干扰能力弱;布袋式除尘器运行控制不正常,锅炉吹灰时除尘器压差瞬间增加变化大,为600～3000Pa,对炉膛负压的干扰大;汽轮机真空低,燃煤增加等。通过采取加强燃煤管理,优化燃烧调整,完善炉膛、烟道、布袋式除尘器清灰吹灰系统的匹配,提高汽轮机真空等措施,可预防锅炉灭火现象的出现。

The problem of large pressure fluctuation in furnace occurred in a 300 MW W-flame boiler in LianYuan Power Plant when soothlowing in the zone of furnace water-wall under the load of 300 MW. The maximum pressure in furnace reached-3 000 Pa, and the furnace pressure protection was activated. The main reason for the failure was as follows： coal quality varied greatly, not rational combustion air distribution, unstable combustion, weak anti-interference ability of boiler, abnormal operation control of bag filter, transient great variation of filter pressure difference（from 600 Pa to 3 000 Pa） during sootblowing, which disturbed furnace negative pressure greatly; low turbine vacuum and burned coal increase, etc.. The following measures were adopted： enhancing coal management, optimizing combustion adjustment, perfecting matching of furnace, duct, bag filter sootblowing system, improving the turbine vacuum and so on, which can prevent the boiler from flame failure.