添加钢渣的碱式碳酸镁脱硫剂脱硫性能的研究
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摘要
脱硫剂的选用是影响燃煤锅炉烟气脱硫效率的重要影响因素之一。实验采用了实验室规模的鼓泡反应装置模拟烟气湿法脱硫过程,分别以碳酸钙、氧化镁、碱式碳酸镁以及添加钢渣的碱式碳酸镁作为脱硫剂进行了烟气脱硫实验,研究反应温度、鼓泡深度以及搅拌速度对脱硫剂脱硫性能的影响。结果表明,在模拟的烟气湿法脱硫反应过程中,几种脱硫剂的脱硫效率随着鼓泡深度与搅拌速度的增加而显著提高,反应温度对脱硫剂脱硫效率的影响并不明显。结合实验现象进行推断,SO2在气液两相界面的传质扩散和其水解产物在液相的扩散直接影响镁基脱硫剂的脱硫过程。
The selection of desulfurization agent is one of the important factors that affect the efficiency of flue gas desulfurization in coal fired boilers. The experiment of wet flue gas desulfurization process is carried out in laboratory scale bubble reactor by using calcium carbonate, magnesium oxide, magnesium carbonate and compound desulfurization agent of magnesium hydroxide carbonate/steel slag.The effect of reaction temperature, bubbling in depth and stirring speed on some desulfurization sorbent performance is studied. The results showed that the desulfurization efficiency of reaction process is significantly increased with the increasing of bubbling in depth and stirring speed, and the effect of reaction temperature on the desulfurization efficiency of desulfurization agent is not to be noticeable. Therefore, it is known by analysis experimental results that the desulfurization process of magnesium-based desulfurization agent is affected directly by mass transfer diffusion of SO_2 in the gas-liquid two interface and its hydrolysis products in the liquid-phase diffusion.
The selection of desulfurization agent is one of the important factors that affect the efficiency of flue gas desulfurization in coal fired boilers. The experiment of wet flue gas desulfurization process is carried out in laboratory scale bubble reactor by using calcium carbonate, magnesium oxide, magnesium carbonate and compound desulfurization agent of magnesium hydroxide carbonate/steel slag.The effect of reaction temperature, bubbling in depth and stirring speed on some desulfurization sorbent performance is studied. The results showed that the desulfurization efficiency of reaction process is significantly increased with the increasing of bubbling in depth and stirring speed, and the effect of reaction temperature on the desulfurization efficiency of desulfurization agent is not to be noticeable. Therefore, it is known by analysis experimental results that the desulfurization process of magnesium-based desulfurization agent is affected directly by mass transfer diffusion of SO_2 in the gas-liquid two interface and its hydrolysis products in the liquid-phase diffusion.
引文
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[3]景启国,徐康富,马永亮,等.氧化镁FGD脱硫过程的建模及其应用[J].环境污染治理技术与设备,2005,6(11):32-38.
[4]宋华,王雪芹,赵贤俊,等.湿法烟气脱硫技术研究现状及进展[J].化学工业与工程,2009,26(5):455-459.
[5]袁钢,马永亮,汪黎东.氧化镁烟气脱硫反应特性研究[J].环境工程学报,2010,4(5):1134-1138.
[6]KLAASSER R.Achieving Flue Gas Desulphurization with Membrane Gas Absorption[J].Filtration and Separation,2003,40(10):26-28.
[7]余世清,吴忠标.几种碱性废渣脱硫性能的比较研究[J].环境工程,2002,20(4):42-45.
[8]谢赛,贵永亮,胡宾生.钢渣用于烧结烟气脱硫的现状和展望[J].环境工程,2014,32:523-525.
[9]丁希楼,郭应春,唐胜卫,等.废钢渣粉渣湿法脱硫工艺实验研究[J].环境工程,2009,27(3):99-102.
[10]YANG R T SHEN M S,STEINBERG M.Fluidized Bed Combustion of Coal with Lime Additive:Catalytic Sulfation of Lime with Iron Compounds and Coal Ash[J].Enviromental Science&Technology,1978,12(8):915-918.
[11]黄红.添加金属氧化物对脱硫剂脱硫性能影响的研究[D].西安:西安建筑科技大学,2005.
[12]罗联村.氨碱废渣用于我国锅炉烟气脱硫[J].纯碱工业,2015(2):20-22.
[13]樊保国,杨靖,刘军娥,等.镁渣脱硫剂的水合及添加剂改性研究[J].热能动力工程,2013,28(4):415-419.