Research on the Regeneration Conditions for Nano ZnO Desulfurizer at Room Temperature

The regeneration conditions for nano ZnO desulfurizer have been studied,such as regeneration temperature and the compositions of regeneration mixed gas,and the numbers of regenerations reaction are carried out,and the detection method of regenerating tail gas is analyzed.The results indicates that the surface of nano ZnO desulfurizer can generate various sulfur species after desulfurization at room temperature,and higher temperature of regeneration is good for removing the products of desulfurization on the surface.However,the regeneration at high temperature will increase the particle size of nano ZnO,thus the performance of desulfurization will decrease.At 450℃,the desulfurization/regeneration experiment is carried out for five cycles under the conditions that the mixed gas is with 5% contents of oxygen;and the sulfur capacity of the desulfurizer after desulfurization is 3.27 times that of fresh ZnO desulfurizer.The regeneration tail gas has been measured with acid-base titration accurately,and the time of regeneration is controlled properly.