柠檬酸强化钢渣湿法烧结烟气脱硫及机理  

Mechanism and process of steel slag agglomeration gas desulfurization enhanced by citric acid

作　　者：刘盛余[1] 邱伟[1] 汪雪婷[1] 能子礼超[1] 廖建权[1] 

机构地区：[1]成都信息工程学院资源环境学院大气环境模拟与污染控制四川省高校重点实验室,成都610225

出　　处：《环境工程学报》2015年第3期1323-1328,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学青年基金(21106009);四川省杰出青年基金(13QNJJ0110);成都信息工程学院中青年学术带头人科研基金(J201110)

摘　　要：在鼓泡反应器中考察了添加柠檬酸强化钢渣湿法烧结烟气脱硫的影响因素,包括钢渣粒度,吸收浆液浓度、进口二氧化硫浓度、停留时间,p H值,柠檬酸与钢渣的浸泡时间等,结果表明,柠檬酸浓度为2.0 mmol/L、钢渣浓度为4%、二氧化硫进口浓度为1 500 mg/m3、烟气停留时间为7 s、钢渣强化时间为2 h、钢渣粒度>200目,脱硫率达到90%以上。经4 mmol/L的柠檬酸强化后的钢渣浆液脱硫率比单纯钢渣浆液提高18.41%,达到90.99%的脱硫率,且有效反应时间延长50%,达到60 min以上。柠檬酸的加入,一方面促进了钢渣碱性组分溶解,另一方面在吸收液中形成柠檬酸和柠檬酸盐缓冲体系,增加了气液界面SO2浓度,提高了SO2的气液传质速率。The effects of steel slag particle size,absorb slurry concentration,import SO2 concentration,retention time,p H value and soaking time on steel slag agglomeration gas desulfurization enhanced by citric acid were studied in bubbling tower. The results showed that the higher SO2 removal of 90% could be obtained under the conditions as follows: citric acid concentration 2. 0 mmol / L,slag concentration 4%,inlet concentration 1500 mg / m3,flue gas retention time 7 s,slag strengthening time 2 h,steel slag particle size larger than 200 mesh. Adding citric acid 4 mmol / L into the steel slag slurry,SO2 removal and continuous reaction time were improved to 90. 99% and 60 minutes,respectively. The dissolution rate of steel slag increased,the buffer system existed on the gas / liquid interface and p H value changed little,which increased the concentration of SO2 on the interface,and increased the mass transfer force of SO2.

关 键 词：烧结烟气 柠檬酸 钢渣 脱硫 机理 

分 类 号：X757[环境科学与工程—环境工程]