600MW锅炉机组低氮燃烧系统优化改造

Modification of the Low Nitrogen Combustion System of a 600 MW Boiler Unit

为了进一步降低某电厂一台600 MW亚临界直流锅炉机组的NOx排放,采用复合式空气分级低NOx燃烧技术对该炉的燃烧系统进行了改造,改后的运行测试表明:在600 MW、330 MW负荷工况下燃用设计煤种时,脱硝反应器入口烟气中的NOx含量分别为121.0和224.4 mg/m3,低于改造目标值;锅炉效率分别为94.13%、93.81%,高于改前测试值;改后炉内无严重结渣,飞灰可燃物略有上升,炉渣可燃物增加较为明显。

To further reduce the NOx emissions of a 600 MW subcritical once-through boiler unit in a power plant,adopted was a complex type air staged low NOx combustion technology to conduct a modification of the combustion system of the boiler under discussion.The operation and measurement results after the modification show that at 600 MW and 330 MW,when the coal rank designed was burned,the NOx content of the flue gases at the inlet of the denitration reactor was 121.0 and 224.4 mg/m 3 respectively,lower than the target value set for the modification and the efficiency of the boiler was 94.13% and 93.81% respectively,higher than the value tested before the modification.After the modification,there existed no serious slagging in the furnace and the combustible of the flying ash increased slightly with a conspicuous increase of the combustible in the slag.