Flue gas desulphurization using sodium sulfide on pilot scale  

作　　者：Shi Lin Gu Guobang 

机构地区：[1]School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510640, China

出　　处：《Engineering Sciences》2010年第2期39-43,共5页中国工程科学（英文版）

基　　金：This research project was sponsored by National Natural Science Foundation (20877026)

摘　　要：A novel technique of flue gas desulphufization （FGD） using industrial sodium sulfide as absorbent is described to remove SO2 in flue gas. The FGD byproduct in this novel technique is sodium thiosuffate （Na2S2O3 · 5H2O, Hypo） which can be used as chemical raw material. Optimal operating parameters about this technique have been determined. In order to enhance productive efficiency of sodium thiosulfate, EDTA disodium additive is added into absorption solution to prevent oxidation of sodium thiosulfate. Its optimal concentration is 0. 02 wt. %. The pH value of absorption solution is set in the range of 5 ~ 6.5. Experimental results show that SO2removal efficiency averagely reach 98.72 %. The highest productive efficiency of sodium thiosulfate reaches 83.24 %. The sodium thiosulfate formed during FGD can be separated from saturated absorbent by filtration, concentration and crystallization. The filtrate after separating sodium thiosulfate will be reused as SO2 absorbent by replenishing some fresh sodium sulfide.

关 键 词：FGD sodium sulfide absorbents sodium thiosulfate 

分 类 号：X701.3[环境科学与工程—环境工程] TQ326.53[化学工程—合成树脂塑料工业]