Study on the Influence of Dust on CO/H2 Deflagration Characteristic

CO/H2 mixture gas may be generated in the local furnace hopper area under the condition of coal quality variation, and deflagration may be caused during the high temperature coke dropping process. As for the complex dust environment of furnace hopper area, the influence of dust of different categories, particle size and concentration on CO/H2 deflagration characteristics under the half-opened environment is studied in this paper. The study indicates that: the influence of dust on CO/H2 deflagration feature mainly results from the release of volatile in dust and the volatile's participation in deflagration reaction. As for high volatile coal dust, volatile releases out and participates in deflagration reaction, which makes the deflagration overpressure of mixture gradually rises with the rising of volatile content; as for low volatile coal dust, the influence of heat absorption for volatile release is greater than the function in which volatile participates in deflagration reaction, thus reducing the deflagration strength. As for Yinbei coal, with the increase of dust concentration, deflagration strength declines firstly and then increases. Experiment also indicates that as for coke dust nearly without volatile, the change of deflagration intensity with dust concentration is not obvious.