沼气中羰基硫的两段深度脱除法  

A two-stage method for deep removal of carbonyl sulfide in biogas

作　　者：龚娟[1] 焦以飞 苏庆泉[2] 米万良[2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学北京市高校节能与环保工程研究中心,北京100083

出　　处：《可再生能源》2013年第12期77-81,88,共6页Renewable Energy Resources

基　　金：国家自然科学基金(20776016和21006005);中央高校基本科研业务费专项资金资助(FRF-SD-12-007B)

摘　　要：研究了采用浸渍法制备的ZnO/γ-Al2O3和CuO/γ-Al2O3,以及γ-Al2O3、商业Fe2O3脱硫剂对沼气中羰基硫(COS)的深度脱除性能。结果表明,CuO/γ-Al2O3的脱除性能优于γ-Al2O3,ZnO/γ-Al2O3及商业Fe2O3脱硫剂,可以在较高的空速(GHSV 1 200 h-1)下一步完成高浓度COS的深度脱除,但其工作温宽较窄。为此提出了两段深度脱除法,第一段采用廉价但活性较低的Fe2O3,第二段采用较昂贵但高活性的CuO/γ-Al2O3,可将沼气中摩尔分数为100×10-6的COS降低到10×10-9以下,从而能够满足PEMFC分布式电站的要求。考察了沼气中水分的影响,当水分为2%时,对两段深度脱除法的影响不大。ZnO/γ-Al2O3 and CuO/γ-Al2O3 were prepared by impregnation method. The research on deep removal of COS from the biogas with the above metal oxides, γ-Al2O3 and commercial Fe203 desulfurizer has been carried out. The results showed that the desulfurization performance of CuO/γ-Al2O3 was better than that of ZnO/γ-Al2O3, γ-Al2O3 and Fe2O3, and it was able to complete the deep removal of high concentration COS with one stage at a relatively high space velocity of 1 200 h-1, but the operating temperature range was narrow. So, a two-stage method was proposed in this paper. The first stage was filled of cheap but low activity Fe2O3 and the second stage was filled of expensive but high activity CuO/γ-Al2O3. With the two-stage desulfurization, molar fraction of COS could be reduced from 100×10^-6 to below 100×10^-9, so it could meet the requirement of the distributed PEMFC power station for deep desulfurization. In addition, the effect of moisture in the biogas was investigated. Moisture of 2% had little effect on COS removal with the two-stage method.

关 键 词：沼气 羰基硫 深度脱硫 

分 类 号：TK6[动力工程及工程热物理—生物能] S216.4[农业科学—农业机械化工程]