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For slag extinguishing process of different capacities boilers (1000MW, 670MW, 300MW, 150MW), the slag extinguishing mechanism is analysed in terms of equipment, slagging characteristics, coal quality, furnace heat load, and operation mode. Prevention measures for slag extinguishing are put forward in terms of fire coal controlling, operation optimization, and technical transformation. Analyses results show that there are mainly three types of furnace pressure change during the slag extinguishing process. The common feature is that the furnace pressure goes up first, which is because of combustible gas explosion in the lower part of the furnace (primary reason) and the entry of a large amount of water vapor into the furnace (secondary reason). The degree of slagging for these four boilers is aggravated by the factors such as high ash content and sulfur content, the low input frequency of soot blower, and the large fineness of the pulverized coal.

Research on the Mechanism of Slagging and Fire-off for different capacity boilers