燃煤电厂储煤场煤堆自燃及防治措施的试验研究

Experimental Study on the Coal Pile Spontaneous Combustion and Prevention Measures in the Coal Yard of the Coal-fired Power Plant

燃煤电厂储煤场煤堆氧化、自燃会导致存煤灰分升高,热值降低,影响电厂运行经济性和安全性。本文选取了南方某电厂堆放的两种典型烟煤为研究对象,考察了煤质特性、外部环境、堆放时间和温度空间分布等因素对煤堆自燃发火性的影响。结果表明,垂直于煤堆表面1m深度内,易出现煤堆自燃敏感温度70-90℃;煤堆温度随高度增加呈现逐渐降低的趋势,煤堆迎风面内部温度低于背风面内部温度。针对煤堆深层注水法及喷洒粉煤灰浆法两种自燃防治措施,评价了其自燃抑止的有效性。

The coal pile oxidization and spontaneous combustion could lead to the increase of ash content of coal and the decrease of coal heat value in the coal yard of the coal-fired power plant, which seriously effect economical efficiency and security in the process of the plant operation. Two typical coal piles with self inflammability were choosed to be investigated. Especially, the effects of coal properties, external environment, stacking time, temperature distribution on spontaneous combustion were considered. The experiment results show that, within one meter depth of the coal pile, coal spontaneous combustion tendency become so evident at self heating period temperature of 70-90~E. Temperature of the coal pile decreas- es with the increase of the height of the coal pile. The internal temperature of the coal pile at the windward side is lower than the internal temperature of the coal pile at the lee side. The two prevention measures of water injection and coal ash sprinkle were studies to investigate their effects on the prevention of coal spontaneous combustion.