title: A pilot-scale jet bubbling reactor for wet flue gas desulfurization with pyrolusite.
abstract: MnO2 in pyrolusite can react with SO2 in flue gas and obtain by-product MnSO4 x H2O. A pilot scale jet bubbling reactor was applied in this work. Different factors affecting both SO2 absorption efficiency and Mn2+ extraction rate have been investigated, these factors include temperature of inlet gas flue, ration of liquid/solid mass flow rate (L/S), pyrolusite grade, and SO2 concentration in the inlet flue gas. In the meantime, the procedure of purification of absorption liquid was also discussed. Experiment results indicated that the increase of temperature from 30 to 70 K caused the increase of SO2 absorption efficiency from 81.4% to 91.2%. And when SO2 concentration in the inlet flue gas increased from 500 to 3000 ppm, SO2 absorption efficiency and Mn2+ extraction rate decreased from 98.1% to 82.2% and from 82.8% to 61.7%, respectively. The content of MnO2 in pyrolusite had a neglectable effect on SO2 absorption efficiency. Low L/S was good for both removal of SO2 and Mn2+ extraction. The absorption liquid was filtrated and purified to remove Si, Mg, Ca, Fe, Al and heavy metals, last product MnSO4 x H2O was obtained which quality could reach China GB1622-86, the industry grade standards.
authors.affiliation: National Engineering Research Center for Flue Gas Desulfurization, Department of Environmental Science and Engineering, Sichuan University, Chengdu 610065, China. shijunsu@263.net
authors.forename: Shi-jun
authors.initials: SJ
authors.lastname: Su
authors.forename: Xiao-fan
authors.initials: XF
authors.lastname: Zhu
authors.forename: Yong-jun
authors.initials: YJ
authors.lastname: Liu
authors.forename: Wen-ju
authors.initials: WJ
authors.lastname: Jiang
authors.forename: Yan
authors.initials: Y
authors.lastname: Jin
mesh_terms: D000042:Absorption; D000397:Air Pollution / Q000517:prevention & control*; D002681:China; D005374:Filtration; D017895:Manganese Compounds / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry* / Q000302:isolation & purification; D010087:Oxides / Q000737:chemistry*; D011210:Power Plants / Q000295:instrumentation* / Q000379:methods; D013458:Sulfur Dioxide / Q000737:chemistry* / Q000302:isolation & purification; D013696:Temperature
chemical_list: D017895:Manganese Compounds; D019216:Metals, Heavy; D010087:Oxides; D013458:Sulfur Dioxide; C027424:manganese oxide