Slagging in boiler furnace can cause huge damages

and it is of great importance to precisely acquire the scaling-off location and the extent of slagging in the furnace to conduct combustion adjustment and avoid the dropping of bulk slag. In a pulverized coal-fired boiler with water-cooled slag removal

a temperature measuring point matrix was arranged in the slag extractor

and the temperature change of the cooling water was continuously monitored under low load conditions. On this basis

this article tried to diagnose the slagging situation inside the furnace. The results show that

the dropping of bulk slag from the furnace would cause the temperature at the slag pool outlet jumped up at first and then declined slowly. Meanwhile

the shorter the distance between the temperature measuring points and the scaling off location

the larger the average(maximum) temperature rise at this measuring point will be. The temperature variation at each measuring point at the front wall and back wall reflected the scalingoff locations. Furthermore

by putting the furnace soot blower into operation

the height of the slag dropping point can be determined. After the scaling-off locations were ascertained

the combustion parameters of the boiler were optimized to reduce the scaling-off and avoid the dropping of bulk slag.