流化床锅炉排渣结焦特性实验研究

Experimental Study on Coking Characteristics of Slag Discharge in Fluidized Bed Boiler

为进一步探究流化床锅炉结焦问题的解决路径,研究了基于某煤化工企业440 t/h循环流化床锅炉的结焦问题,结合其燃料特性,搭建实验装置,对流化床锅炉排渣结焦特性进行较为全面的分析。分析结果显示,该流化床锅炉在空气气氛下更容易发生结焦,而在烟气气氛下则不易发生结焦问题,并得出灰渣中残余碳组分二次燃烧造成了结焦,提出引入烟气作为流化介质对流化床中的风水联合冷渣器进行优化的策略,以期为后续研究提供参考借鉴。

In order to further explore the solution path of coking problem in fluidized bed boilers,the coking problem of a 440 t/h circulating fluidized bed boiler based on a coal chemical enterprise was studied.Combined with its fuel characteristics,an experimental device was built to comprehensively analyze the coking characteristics of fluidized bed boiler slag discharge.The analysis results show that the fluidized bed boiler is more prone to coking under air atmosphere,while it is less prone to coking under flue gas atmosphere.It is concluded that the secondary combustion of residual carbon components in the ash caused coking.A strategy of introducing flue gas as a fluidized medium to optimize the wind water combined slag cooler in the fluidized bed is proposed,in order to provide reference and guidance for subsequent research.