煤炭地下气化煤气扩散规律数值模拟研究

Numerical Simulation Study on Gas Diffusion Law of Coal Underground Gasification

对煤炭地下气化原理,气体扩散原理进行分析,以计算流体动力学软件(CFD)为基础,模拟分析CO在不同泄漏速度、不同通风速度的情况下在巷道中的体积分数,得出随着泄漏速度的增大,煤气中毒性增大,发生煤气爆炸的可能性也逐渐增高;随着风速的加大,危险区域会逐渐向下风向和靠近泄漏口一侧偏移的扩散规律。当发生煤气泄漏应采取加大通风来稀释煤气浓度,保证人员安全的措施。

The principle of underground coal gasification and the principle of gas diffusion are analyzed,based on the computational fluid dynamics software（ CFD）,the volume fraction of CO in the roadway is simulated and analyzed with different leakage rates and different ventilation velocities. A diffusion law is obtained that with the increase of leakage rate,the toxicity in gas increases,the possibility of gas explosion also gradually increases. With the increase of wind velocity,the dangerous area will gradually shift downwind and close to the side of the leakage port. When gas leakage occurs,more ventilation should be adopted to dilute the gas concentration and ensure the safety of personnel.