Research and application of boiler switching to burn Zhundong coal to improve drying output of coal milling system
Due to the change of coal supply,some in-service units in Xinjiang need to burn high-moisture Zhundong coal,and the original design coal has low moisture,which will lead to insufficient drying output of the pulverizing system after burning,especially in cold weather.Taking a 480 t/h boiler modified to burn Zhundong coal as the research object,this paper improves the primary air temperature by adding a primary air box above the original secondary air box of the tubular air preheater.The results show that the primary air temperature is increased from about 300℃ to 370℃,the outlet air temperature of the mill is more than 60℃in each season,and the drying output of the mill is obviously increased.After the transformation,the primary air temperature can be flexibly adjusted between 300℃ and 370℃,which improves the adaptability to coal species and seasonal changes.Practice has proved that the technical transformation method of adding a primary air duct box above the original secondary air duct box is feasible and effective.
Zhundong coaldrying outputmilling systemair preheaterprimary air temperatureequipment modification
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