Effect of bituminous coal blending on MB fan mill for 600 MW lignite unit

In order to comprehensively analyze the influence of lignite boiler with blending bituminous coal on the promotion pressure,grinding force,drying output and operation parameters of the MB fan mill,the semi-industrial test on a SO_2 fan mill and the thermal equilibrium computation for three medium fan mill MB3600/1000/4900 were carried out,and the combustion characteristic of mixed coal was tested on one-dimensional flame furnace and coal-air flow ignition temperature test furnace.The results show that through blending low calorific value lignite with a suitable proportion of high-quality bituminous coal,the load carrying capacity can be improved,and the drying capacity and promotion pressure also can fulfill the operation requirement.It is important to note that blending of bituminous coal will reduce the life of striking plate due to the stronger wear resistance of bituminous coal.