摘要
煤浆法烟气脱硫是以煤浆洗涤含二氧化硫的烟气,二氧化硫溶于浆液形成亚硫酸,煤中黄铁矿与亚硫酸、氧气发生反应,亚硫酸被氧化为硫酸,从而实现烟气脱硫.反应过程中,煤中的黄铁矿硫也被转化为硫酸而浸出,反应产生的Fe3+/Fe2+又对脱硫反应起到了催化剂的作用.以旋流板塔为吸收设备,研究了煤浆法烟气脱硫过程中浆液温度、液气比、空塔气速及浆液固液比等操作参数对脱硫率的影响规律.试验表明,在其他条件不变的情况下,适当提高液气比、空塔气速及浆液固液比均有利于提高脱硫效果.随着烟气脱硫过程的进行,脱硫浆液中的总铁含量不断增加,说明煤中黄铁矿被不断浸出,故此法在脱除烟气中的二氧化硫的同时也降低了煤中黄铁矿硫含量.
Flue gas desulphurization with coal slurry is a method which removes SO2 from flue gas with coal slurry as scrubbing medium.SO2 is transformed into H2SO3 after dissolving,and then H2SO3 is oxidized into H2SO4 through the reaction with coal pyrite and O2.Coal pyrite sulfur can also be transformed into H2SO4.And then,Fe2＋/Fe3＋ ions produced in the reaction serve as catalyst in the aqueous catalyzed oxidation of SO2.Effects on SO2 removal of temperature,liquid-to-gas ratio（L/G）,the gas flow rate and the slurry solid content,were experimentally studied using rotating-stream tray towers as scrubbers.The research shows that,under the same other operating factors,properly increasing liquid-to-gas ratio,the gas flow rate and the slurry solid content,is helpful for SO2removal.The increase of Fe2＋/Fe3＋ concentration in the slurry demonstrated that coal pyrite sulfur was continuously leached.So it could reduce the coal pyrite sulfur during removing SO2 from flue gas.
出处
《青岛理工大学学报》
CAS
2009年第2期65-69,共5页
Journal of Qingdao University of Technology
基金
山东省自然科学基金项目(2006ZRB01870)
青岛市科技计划项目(07-2-3-13-JCH)
关键词
烟气脱硫
煤浆
液相催化氧化
旋流板塔
flue gas desulphurization
coal slurry
aqueous catalyzed oxidation
rotating-stream tray scrubber
