超临界W火焰锅炉二次风箱结构优化改造及效果分析

Optimization Retrofit and Effect Analysis of Supercritical W-flame Boiler Secondary Air Box Structure

W火焰锅炉炉膛宽度大,大风箱结构的二次风容易出现配风不均,导致炉膛局部缺氧和水冷壁壁温偏差等问题,通过运行调整手段已无法解决。根据测试结果,对风箱结构进行了优化改造,采用分区控制的方式进行配风。通过对改造后的风箱进行调整试验,大幅降低了炉膛内CO含量,有效提高了锅炉效率和机组经济性;实现了二次风“前墙压后墙”的配风方式,增加了运行人员调节手段,有效控制了壁温偏差。

The width of the W-flame boiler furnace is large, and the secondary air of the large bellows structure is prone to uneven air distribution, resulting in local oxygen deficiency in the furnace and deviation of the water wall temperature,which cannot be solved by means of operation adjustment. According to the test results, the bellows structure was optimized and transformed, and the air distribution was carried out by means of partition control. Through the adjustment test of the modified bellows, the CO content in furnace is greatly reduced, and the boiler efficiency and unit economy are effectively improved;the air distribution mode of ’front wall pressing the rear wall’ for the secondary air is realized,which increases the adjustment means of operators and effectively controls the wall temperature deviation.