循环流化床锅炉燃煤着火特性

Ignition Characteristic of Coal in CFB Boiler

在电加热的小型流化床燃烧系统上,采用热烟气炉下点火方式研究了7个煤种的着火点,并分析了粒径、床温、挥发分、水分等因素对着火特性的影响.提出了煤颗粒在流化床内着火点测定的实验规范,并在TGA上测量着火点,与实际电厂锅炉投煤温度进行了比较.结果表明,在流化床实验台上测得的着火温度可以通过修正来表示实际锅炉上的投煤温度.

This paper studies the ignition characteristic of 7 coals in the laboratory scale fluidized bed heated by the hot gas under distributor. The effects of particle size, furnace temperature, volatile compound and moisture on the ignition temperature were analyzed. The standard of operating condition for measuring coal ignition temperature in fluidized bed was provided. The ignition temperatures (in fluidized bed, those measured) in thermogravimetric analysis (TGA) and the feeding temperatures in real CFB boilers were studied in comparison, indicating that the temperatures in fluidized bed can be used as reference for real coal feeding temperatures.