Simulation On Coal Pile Spontaneous Combustion Process Based On PFC3D

Coal self-heating and spontaneous combustion will reduce the taste of coal and pollute the environment. The fire can cause great economic loss. In order to fully understand the characteristics of different stages in the process of coal spontaneous combustion and provide theoretical reference for the prevention and control of it, the thesis use PFC3D to make experiment simulation about it based on the theory of particle. It has been provided that flow distribution of temperature field and flow field in different periods of the spontaneous combustion. As the growth of the simulation time, high temperature field is moved to the slope boundary of pile model. Energy transfer occurs mainly near the area of low temperature area, and the max energy transfer is at the border of different temperature area; the motion of High temperature area is caused due to the changes of oxidation oxygen demand, which produce "pumping" action of oxygen; The distribution of oxygen particles in coal pile can be divided into the steady flow area, turbulent area, weak area. Along with the increase of the "pumping" action, steady flow area is contracted, turbulent area and weak area spread; Simulation to 70 d, a wide range of the red areas appears in coal pile and coal begins spontaneous combustion. The highest temperature is 362.1 K at this time.