双碱法烟气脱硫工艺实验研究  

Experimental Studies on Dual-alkali Flue Gas Desulfurization Technology

作　　者：先元华[1] 

机构地区：[1]宜宾职业技术学院生物与化工工程系,四川宜宾644003

出　　处：《环境科学与技术》2015年第4期166-169,共4页Environmental Science & Technology

基　　金：四川省自然科学基金(2013NY028)

摘　　要：在工业规模装置上对双碱法烟气脱硫工艺进行了系统实验研究了,主要考察了Na OH和Ca（OH）2浓度、烟气含尘量、钙硫比（脱硫剂中钙的摩尔数与煤中硫的摩尔数之比）、液气比（脱硫剂流量L与烟气流量G之比）、烟气温度、烟气与脱硫剂接触时间以及加氧量对脱硫效果的影响。结果表明：烟气脱硫率随Na OH浓度在5%~30%范围内的增加逐渐增加,Na OH浓度高于30%对脱硫率影响不大,Ca（OH）2浓度为10%~12%时脱硫率最高;烟气含尘量由1 600 mg/m3降低到400 mg/m3,脱硫率从95%线性降低到84%;钙硫比为1.1时脱硫效果最好;脱硫率随液气比的增加逐渐升高,当液气比高于15.5 L/m3,脱硫率变化不大;较低的烟气进口温度利于SO2的吸收,脱硫率越高;烟气与脱硫剂接触时间越长,脱硫率越高;氧气的通入将亚硫酸盐氧化为硫酸盐,提高了脱硫率,同时可避免结垢。To investigate duN-alkali flue gas desulfurization （FGD）, experiments in series were carried out with a full- scale equipment, focusing on the influencing parameters on desulfurization efficiency, such as the concentrations of NaOH and Ca（OH）2, dust content, ratio of Ca/S, liquor/gas ratio, flue gas temperature, contact time of flue gas/desulfurization agents and oxygen content. The investigation showed that as NaOH concentration increased within the range of 5%~30%, so did the desulfurization efficiency remarkably; as to Ca（OH）2 the best concentration range was from 10 to 12% for higher desulfurization efficiency. It was found desulfurization efficiency was influenced by dust content in flue gas： decreased with the drop of dust concentration; the optimal Ca/S ratio was 1.1 （mol）; the ratio of liquor （volume of liquid desulfurization agents ）/gas （flue gas）, when being increased, could raise desulfurization efficiency but reached stable as liquor/gas rose to as high as 15.5 L/ms. In addition, lower input temperature of flue gas favored the absorption of SO2, hence the desulfurization efficiency increased; the longer contact time led to higher desulfurization efficiency; and increasing oxygen content also promoted desulfurization efficiency and overcomes scaling phenomenon as well.

关 键 词：烟气 脱硫 双碱法 脱硫率 

分 类 号：X383[环境科学与工程—环境工程]