Analysis on Causes of Boiler Fire Distinguishing after Low NOx Retrofit and the Countermeasures

The units are stopped largely due to boiler fire distinguishing, which is short and can not easily be detected. The reasons of boiler fire distinguishing are quite different. Disadvanges in operation adjustment, coal quality, operation mode of pulverized coal preparation system and secondary air distribution are detect- ed; besides, feasible preventive measures are formulated to further prevent boiler fire distinguishing to miti- gate boiler loss. After serious implementation of these measures, the boiler fire distinguishing is almost pre- vented in the power plant and operation safety of the units is guaranteed.