古电4#600 MW对冲炉一二次配风调整与壁温及控制分析

Analysis of Primary and Secondary Air Distribution Adjustment and Wall Temperature Control for MW Punching Furnace

针对古电#4锅炉内部燃烧偏斜,锅炉长期存在垂直管、过热器壁温超温现象,左侧墙垂直管超温频繁超过460℃,同时过热器生成氧化皮并脱落造成爆管事故,严重影响电厂安全经济性问题,从调整磨煤机出口风量、降低一次风速、调整二次风旋流强度及二次风风量等手段,控制炉膛内煤粉燃烧状态入手进行燃烧调整,有效降低炉膛内各受热面的金属壁温,控制金属壁温在正常范围并且减少垂直管高温硫腐蚀情况,在经济安全运行上取的显著效果。

In view of the internal combustion deviation of Gudian No.4 boiler,there is a long-term over temperature phenomenon of vertical tube and superheater wall temperature in the boiler.The over temperature of vertical tube on the left-wall frequently exceeds 460℃.Meanwhile,the superheater generates oxide scale and falls off,causing tube explosion accident,which seriously affects the safety and economy of the power plant.By means of adjusting the outlet air volume of coal mill,reducing the primary air speed,adjusting the swirl intensity of secondary air and the secondary air volume,controlling the combustion state of pulverized coal in the furnace,the combustion adjustment can effectively reduce the metal wall temperature of each heating surface in the furnace,control the metal wall temperature in the normal range,and reduce the high temperature sulfur corrosion of vertical tube,which has achieved remarkable results in economic and safe operation.