粉末活性炭还原二氧化硫回收硫磺的沉降炉试验研究  

Experimental study on SO2 reduction to elemental sulfur with powdered activated carbon in a drop-tube reactor

作　　者：冯太 闫鲁玉 刘志[3] 徐天明 周滨选 赵希强[3] 马春元[3] FENG Tai;YAN Luyu;LIU Zhi;XU Tianming;ZHOU Binxuan;ZHAO Xiqiang;MA Chunyuan(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Ji´nan Towngas Company Limited,Ji´nan 250014,China;National Engineering Laboratory for Coal-fired Pollutants Emission Reduction,Shandong University,Ji´nan 250061,China)

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266590 [2]济南港华燃气有限公司,济南250014 [3]山东大学燃煤污染物减排国家工程实验室,济南250061

出　　处：《华电技术》2020年第10期13-21,共9页HUADIAN TECHNOLOGY

基　　金：国家重点研发计划(2017YFB0602903)。

摘　　要：针对我国硫磺资源短缺现状及当前脱硫技术无法实现SO2资源化利用的问题,提出了以活性炭粉末为还原剂,气固两相流动下还原SO2为单质硫的方法。研究了反应温度、C/SO2摩尔比及CO,H2,CO2和水蒸气体积分数对反应的影响。研究表明:较高的反应温度和C/SO2摩尔比有利于提升活性炭对SO2的还原效率和反应速率,且对COS生成的促进不大,单质S选择性较高;CO和H2的加入均可显著提高SO2转化率,但反应过程中生成大量的含S副产物,导致单质S选择性降低;CO2对整体反应影响轻微;H2O的加入影响Claus反应平衡,导致H2S生成量增加,单质S选择性显著降低。经济性分析表明:工艺主要成本为加热能耗和活性炭反应物耗;每脱除1 g的SO2,可产出硫磺0.38 g,消耗活性炭0.16 g,同时带来1.7 kJ的能耗。该研究为流化床碳热还原SO2工艺提供了理论支持。In view of sulfur resources shortage in China and the problem that SO2 recycling cannot be realized by current desulfurization technology,a method was proposed to reduce SO2 to elemental sulfur by using activated carbon powder as reducing agent under gas-solid two-phase flow.The effects of reaction temperature,molar ratio of C/SO2,and concentration of CO,H2,CO2 and water vapor on the reaction were studied.The results show that higher reaction temperature and C/SO2 molar ratio are conducive to improving the reduction efficiency and reaction rate of SO2 by activated carbon,and have little effect on COS generation and lead to a high selectivity of elemental S.The addition of CO and H2 can significantly improve the conversion rate of SO2,but a large number of S-containing by-products are generated during the reaction,leading to a decrease in the selectivity of elemental S.CO2 has little effect on the whole reaction.The addition of H2O affects the Claus reaction balance,resulting in the increase of H2S production and the significant decrease of the selectivity of elemental S.The economic analysis indicates that the main cost of the process includes energy consumption for heating and reaction material consumption of activated carbon.Every 1 g removed SO2 can produces 0.38 g sulfur,and consumes 0.16 g activated carbon and 1.7 kJ energy.This study provides theoretical support for the carbothermal reduction of SO2 in fluidized beds.

关 键 词：活性炭 还原 单质硫 SO2 沉降炉 流化床 资源化利用 

分 类 号：X511[环境科学与工程—环境工程]