KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Green SO2 conversion from flue gas by pH variation | |
Li, Liangjun1; Guo, Jianwei1 ; Yang, Zhe1; Zheng, Linze1; Liu, Hong2
| |
| 2016-02-01 | |
| 摘要 | Emissions reduction or conversion by clean technologies has always been a mission for environmental protection and sustainable development. A green, electrochemically driven conversion of SO2 to NaHSO4 from flue gas by pH variation was conducted. Experiments were carried out to investigate some factors affecting the conversion process, such as O-2 function in flue gas, selected initial pH (pH(0)) of solution, and CO2 effects of high concentration. Experimental results revealed that (i) O-2 was essential for SO2 absorption, since the pH of solution was decreased more effectively than that of flue gas without O-2. The lowest pH of absorption solution with pouring O-2 was about 3.2, which was benefit to formatting HSO3 (-) but hindering absorption of CO2. Meanwhile, O-2 from flue gas accelerated the adsorption of SO2 for its oxidability to change HSO3 (-) and SO3 (2-) ions into SO4 (2-). (ii) At the conditions of different pH(0), the minimum absorption efficiency of SO2 was 89.3 %, corresponding to pH(0) 5.0 and 7.0, while maximum value was 100.1 % corresponding to pH(0) 6.0, which meant pH(0) 6.0 was more appropriate for SO2 conversion by electrochemistry under the experimental pH(0) range. (iii) The absorption efficiency of CO2 was at a very low level under conditions of pH(0) 5.0, 6.0, and 7.0, whose value of minimum and maximum was 0.07 and 0.19 %. The result showed that high concentration of CO2 from flue gas had little affection on desulfurization under the experimental pH(0) range, which enable to infer that byproduct of NaHSO4 is pure enough. |
| 关键词 | pH variation Conversion of SO2 Efficiency of SO2 Flue gas |
| DOI | 10.1007/s10098-015-1034-6 |
| 发表期刊 | CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
 |
| ISSN | 1618-954X |
| 卷号 | 18期号:2页码:593-600 |
| 通讯作者 | Guo, JW (reprint author), Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Guangdong, Peoples R China. |
| 收录类别 | SCI |
| WOS记录号 | WOS:000370819500021 |
| 语种 | 英语 |
