A general mathematical model is developed to describe the behavior of fixed bed reactor for removing hydrogen sulfide by impregnated activated carbon

and the governing equations are solved by testing-calibration differential-difference ethod.The general chracteristics of the desulfurizing process in a fixed bed reactor are analysed by model simulation.The results show that the average sulfur capacity over the whole reactor can be increased by using smaller desulfurizing agent and by operating at a lower space velocity

but it has nothing to do with the H_2S concentration in inlet gas．