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Perfect removal of SOx, NOx, NH3 and dioxin over activated carbon fiber

活性炭纤维完美去除 SOx、NOx、NH3 和二恶英

基本信息

批准号：
11218208
负责人：
MOCHIDA Isao
金额：
$ 20.35万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

项目摘要

A flue gas treatment which consisted of switching two steps : removal of S0_2 and regeneration of adsorption ability, using a pitch based activated carbon fiber of very large surface area (ACF), was proposed to allow the continuous removal of S0_2 in flue gas with limited humidity at 50-70℃. Removal of S0_2 at 60-70℃ and regeneration at 30℃ with humid air without S0_2 were found successful to design a switching procedure. Higher temperature of regeneration required more time, although a small difference of two temperatures may be easy for control. The second procedure which removed S0_2 successively at two different temperatures was found also possible although the period of removal at a higher temperature was rather short. This procedure relies on the fact that the amount of adsorbed H_2S0_4 on ACF under stationary conditions was smaller at a lower temperature when sufficient amount of ACF was loaded. In both cases, the regeneration to elute out ad. H_2S0_4 over ACF is the rate determining. It is found by TPD that the regeneration at 30℃ and 70℃ eluted preferentially two H_2S0_4 species over the ACF surface which evolved at lower and higher temperatures, respectively. Adsorbed H_2S0_4 located in the pore which is easily reduced to evolve at a lower temperature in TPD procedure is eluted first at 30℃ since H_20 vapor can get into the pore at the temperature. In contrast, adsorbed H_2S0_4 located on the outer surface of ACF was preferably eluted out at 70℃. Such H_2S0_4 is away from the reactive ACF surface to be reduced to evolve at a higher temperature in TPD.

提出了一种利用超大比表面积沥青基活性碳纤维在50~70℃湿度范围内连续脱除烟气中二氧化硫的方法，包括脱除二氧化硫和再生吸附两步。在60-70℃时脱除SO2，在30℃时用不含SO2的湿空气再生，成功地设计了一种切换程序。更高的再生温度需要更多的时间，尽管两个温度的微小差异可能很容易控制。第二步在两个不同的温度下连续脱除SO2也是可行的，尽管在较高温度下脱除时间较短。这一过程依赖于ACF在固定条件下吸附H_2SO_4的量在较低的温度下较小的事实。在这两种情况下，再生都会冲出广告。ACF上的H_2SO_4是反应速率的决定因素。热重分析发现，30℃和70℃下的再生优先洗脱出两种H_2SO_4物种，这两种物种分别在较低和较高温度下析出。吸附在孔道中的H_2SO_4在较低温度下容易还原析出，在30℃时首先被洗脱，因为在该温度下H_20水蒸气可以进入孔道。相反，吸附在ACF外表面的H_2SO_4在70℃时洗脱效果较好。这样的H_2SO_4远离活性ACF表面，在TPD中被还原并在更高的温度下析出。