Desulfurization Performance Optimization Of Dry-method Desulfurizer And Its Regeneration Performance

Dry- method is widely used for fuel gas purification due to its numerous advantages such as simple process, high desulfurization accuracy, no effluent discharge and so on. However, several shortcomings of low mass transfer rate, easy deactivation and poor regeneration performance are existed in dry- method adsorbents. With the introduction of catalyst design concepts, adsorption coupled with catalytic oxidation desulfurizer(referred to as coupled desulfurizer) was prepared in this paper. And operating conditions of its desulfurization and regeneration were fully optimized. By doing so, the existing application bottlenecks of dry- method desulfurizers were tried to be solved.Coupled desulfurizer was prepared through multi-step impregnation method, in which ferric oxide was loaded on a commercial activated carbon(AC). And its physi-chemical structure was associated with desulfurization performance. It indicated that Fe2O3 was highly dispersed on AC, which guaranteed its superior desulfurization performance compared with vigin AC. The sulfur capacity was closely related to microporous structure of couple desulfurizer. Dispersion of Fe2O3 was further improved with the introduction of vanadium which accelerated the diffusion of reactants, thus effectively suppressing the generation of SO2 in tail gas. In addition, a possible desulfurization ro ute was tentatively put forward. The desulfurization performance of different organic sulfides on coupled desulfurizer was also investigated meanwhile.It indicated that there was an optimum point for both GHSV and temperature during the operational conditions optimization process. Water films were required in desulfurization, but mass transfer resistance was increased once water content in feed became higher. Coupled desulfurizer would efficiently perform within relatively low oxygen content. It is indicated thatAccording to the regeneration results of coupled desulfurizer, it was the deposition of desulfurization products, containing elemental sulfur, FeS and Fe2(SO4)3, that mainly led to the exhaustion of coupled desulfurizer. Thus coupled desulfurizer could be deactivated by staining and poisoning. Once regeneration efficiency of coupled desulfurizer could reach 83.3% respectively when heated at 475 ℃ with GHSV=7000h-1 under N2 atmosphere.