125MW煤粉炉内分级燃烧的数值模拟

NUMERICAL RESEARCH ON THE STAGING COMBUSTION OF A 125MW PULVERIZED COAL BOILER

对125 MW煤粉炉内两种工况的分级燃烧进行了数值模拟,得到了炉内温度、速度分布以及NOx,CO,CO2等气相组分浓度分布.结果表明,随二次风率降低、燃尽风率的增加,炉内最高温度降低,炉内高温区上移,NOx浓度降低;整个炉膛内部湍流强度都比较强烈;炉内CO和CO2浓度分布及速度分布与实际燃烧状况能较好吻合,可为低NOx燃烧技术和锅炉改造提供指导.

Staging combustion is one of the ma）or means among the 10w NOx technologies. We made numerical research on the staging combustion of a 125 MW pulverized coal boiler, the temperature field and the distribution of CO2, CO, O2 and NOx were achieved. The results indicate the highest temperature fall and the high temperature zone move upward while reducing the secondary air rate or increasing the burnout air rate, the turbulence intensity in the furnace is violence, the concentration and velocity of CO,CO2 are consistent with the factual combustion. This study can give advice of low NOx technologies and rebuilding.