采用旋流煤粉燃烧方式的1 025 t/h锅炉结渣原因的工业试验

针对采用旋流煤粉燃烧方式燃用贫煤的1025 t/h锅炉结渣问题,进行了冷、热态工业试验．结果表明,采用双调风旋流燃烧器的锅炉中、下层燃烧器区域结渣；高负荷结渣严重,低负荷结渣情况有所减缓,但掉渣更加频繁；锅炉前墙燃烧器区温度高于后墙．双调风旋流燃烧器和中心给粉燃烧器都具有大且稳定的回流区,并有较大的扩展角；下层燃烧器采用中心给粉旋流煤粉燃烧器可有效避免结渣．

Slagging in Coal-Fired 1 025 t/h Boiler with the Swirl Coal Combustion Technology

The cold and hot reacting flow measurement was performed in low-grade-coal-fired 1 025 t/h boiler with en- hanced ignition-dual register (EI-DR) burners to solve the slagging problem of furnace.The results show that slagging oc- curs in the burners region of the boiler with EI-DR burners;in full load the slagging is more frequent than in low load,but in low load that slagging ash blocks fall more frequently than in full load.In the burners region the temperature in the front was were higher than that in the rear wall.Both EI-DR burner and central-fuel-rich swirl coal combustion burner can a- chieve a moderate central recirculation zone and divergent angle of the air jet.The slagging can be avoided in the boiler of which 8 EI-DR burners at the bottom row were retrofitted to the central-fuel-rich swirl coal combustion burners.