Based on the software used in the simulation calculation of unsteady state SO_2 converter，a comparison between two types of unsteady state converter

namely

heat removal and adiabatic converter is presented in this paper.The effects of parameters such as gas concentration，velocity，cycle duration and cooling capacity on unsteady state SO_2 converter are studied.For the gas of high concentration，two-point heat removal structure is recommended.With identical gas concentration

traveling wave velocity is directly proportional to gas velocity.For two-point heat removal converter

cooling capacity and cycle duration are two controllable variables in optimizing the reaction，whereas the inlet temperature of gas and preheated temperature of catalyst bed have relatively minor effect on unsteady state conversion.