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我市某大型企业自备电厂的锅炉制粉系统中的球磨机发生着火爆炸,烧毁煤粉管路,造成停产,直接经济损失5万元。事后,现场发现球磨机出口处测温热电偶测温不准(误差竟达20℃);球磨机底部和煤粉管路内有大量的煤粉沉积,且测试煤粉中含有过量的黄铁矿(FeS);煤质分析发现V~r为55%,W~y为30%,A~y为20%,R_(90)为20.5%。由煤分析数据可知,此煤种为褐煤,一般褐煤中的挥发分析出温度130～170℃,易析出。当磨煤机温度升高
The ball mill in the pulverizing system of the boiler in a power plant owned by a large-scale enterprise in our city has a fire explosion and burns down the pulverized coal pipeline, resulting in the discontinuation of production. The direct economic loss is 50,000 yuan. After the incident, found at the exit of the ball mill temperature thermocouple temperature measurement is not allowed (error as high as 20 ℃); the bottom of the mill and pulverized coal pipeline has a lot of pulverized coal deposition, and the test pulverized coal contains excess pyrite ( FeS); coal quality analysis found that V ~ r is 55%, W ~ y is 30%, A ~ y is 20%, R_ (90) is 20.5%. From the coal analysis data shows that this coal is lignite, lignite in the general analysis of the temperature of 130 ~ 170 ℃, easy to precipitate. When the coal mill temperature rises