污水处理厂格栅间硫化氢分布规律数值模拟

Numerical Simulation of Hydrogen Sulfide Distribution in the Grille Machine Room of Sewage Treatment Plant

针对格栅间硫化氢污染和硫化氢导致作业人员中毒死亡的问题,通过改变风向、室温、通风方式等影响因素,采用Fluent数值模拟的方法,研究了城市污水处理厂格栅间内硫化氢气体浓度分布规律及工作人员作业时所接触的硫化氢浓度阈值。结果表明自然进风-机械排风时,格栅间内硫化氢平均浓度分布最高仅为4.53 mg/m^(3);机械排风时,工作人员在格栅间内作业所接触的硫化氢浓度超过10 mg/m^(3),最高浓度可达15.44 mg/m^(3)。可见自然进风对格栅间内硫化氢的稀释效果较好,且自然风风向与门窗朝向越接近一致,稀释效果越好。

Aiming at the problem of hydrogen sulfide pollution in the grille machine room and the poisoning death of operators caused by hydrogen sulfide,by changing the wind direction,room temperature,ventilation mode and other influencing factors,the Fluent numerical simulation method was used to study the distribution of hydrogen sulfide gas concentration in the grille machine room of urban sewage treatment plants and the threshold of hydrogen sulfide concentration exposed to workers during operation.The results show that the highest average concentration distribution of hydrogen sulfide in the grille machine room is only 4.53 mg/m^(3)when natural air inlet and mechanical air exhaust are used.During mechanical ventilation,the concentration of hydrogen sulfide exposed to workers working in the grille machine room exceeds 10 mg/m^(3),and the maximum concentration can reach 15.44 mg/m^(3).It can be seen that the natural air inlet has a good dilution effect on hydrogen sulfide in the grille machine room,and the closer the natural wind direction is to the door and window orientation,the better the dilution effect.