常温下料屉式颗粒床过滤除尘技术
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摘要
针对冶金、化工、钢铁、能源等行业含尘烟气排放问题,搭建料屉式颗粒床过滤实验台开展含尘烟气在料屉式颗粒床中的过滤特性研究。在常温下以平均粒径为64μm的粉煤灰为尘粒,研究了过滤风速、颗粒层厚度、滤料粒径、床层结构等因素对过滤效率和床层压降的影响.结果表明过滤效率随过滤风速和滤料粒径的减小、颗粒层厚度的增加而增加,床层压降随过滤风速和颗粒层厚度的减小、滤料粒径的增加而下降;气流自上而下流动时,最上层颗粒层对粉尘捕集量最高,且在表层形成了滤饼层,最上层压降最大.在本文研究范围内,当含尘气体入口浓度为2500 mg/m~3时,最优过滤条件如下:过滤风速为0.3 m/s、滤料粒径为1.0～1.5 mm、颗粒层厚度为140 mm时,含尘气体出口浓度低至40.80mg/m~3,过滤效率达97.76%,床层压降为114 Pa,且压降增长幅度为0.55 Pa/min.
Aiming at the problem of dusty flue gas emission in metallurgy, chemical industry,steel, energy and other industries, drawer type granular bed experiment platform was built, and the filtration characteristics of dusty flue gas was carried out. The fly ash with the average particle size of64μm was used as the dust particles at room temperature, and the influence of the filter velocity, the thickness of the granular layer, the particle size of the filter material and the bed layer structure on the filtration efficiency and the bed pressure drop were studied. The results show that the filtration efficiency increases with the decrease of filtration velocity and particle size, and the increase of the granular layer thickness; the bed pressure drop decreases with the decrease of the filtration velocity and granular layer thickness, and the increase of particle size. When the gas flows from top to bottom,the top layer of the granular layer has the highest dust capture, and since the filter cake forms on the surface, the pressure drop of the first layer is the largest. When the dust concentration of the inlet gas is 2500 mg/m~3,the optimum filtration conditions are as follows: the filtration velocity is0.3 m/s,the particle size of the filter material is 1.0～1.5 mm, and the granular layer thickness is 140 mm, and the dust concentration of the outlet gas can receive 40.80 mg/m~3, the filtration efficiency is up to 97.76%, the bed pressure drop is only 114 Pa, and the increase of pressure drop is 0.55 Pa/min.
Aiming at the problem of dusty flue gas emission in metallurgy, chemical industry,steel, energy and other industries, drawer type granular bed experiment platform was built, and the filtration characteristics of dusty flue gas was carried out. The fly ash with the average particle size of64μm was used as the dust particles at room temperature, and the influence of the filter velocity, the thickness of the granular layer, the particle size of the filter material and the bed layer structure on the filtration efficiency and the bed pressure drop were studied. The results show that the filtration efficiency increases with the decrease of filtration velocity and particle size, and the increase of the granular layer thickness; the bed pressure drop decreases with the decrease of the filtration velocity and granular layer thickness, and the increase of particle size. When the gas flows from top to bottom,the top layer of the granular layer has the highest dust capture, and since the filter cake forms on the surface, the pressure drop of the first layer is the largest. When the dust concentration of the inlet gas is 2500 mg/m~3,the optimum filtration conditions are as follows: the filtration velocity is0.3 m/s,the particle size of the filter material is 1.0～1.5 mm, and the granular layer thickness is 140 mm, and the dust concentration of the outlet gas can receive 40.80 mg/m~3, the filtration efficiency is up to 97.76%, the bed pressure drop is only 114 Pa, and the increase of pressure drop is 0.55 Pa/min.
引文
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[10] Paenpong C, Pattiya A. Filtration of Fast Pyrolysis Char Fines with a Cross-flow Moving-bed Granular Filter[J].Powder Technology, 2013, 245(9):233-240
[11] Shi K Y, Yang G H, Huang S, et al. Study on Filtering Characteristics of Aerosol Particulates in a Powder-grain Dual-layer Granular Bed[J]. Powder Technology, 2015,272(3):54-63
[12] Walate S A, Takahashi T, ChiTien. Effect of Particle Deposition on Granular Aerosol Filtration[J]. Aerosol Science and Technology, 1986, 5(1):23-27
[13]付海明,亢燕铭.粉尘沉积形成滤饼结构的分形研究[J].过滤与分离,2008, 18(2):4-7Fu H M, Kang Y M. Dust Deposition Forms the Fractal Study of Filter Cake Structure[J]. Filtration and Separation, 2008, 18(2):4-7
[2]孙志辉,王助良.新型颗粒层除尘器过滤性能的研究[D].镇江:江苏大学,2007Sun Z H, Wang Z L. Research on the Filtration Properties of New Particle Filter[D]. Zhenjiang:Jiangsu University,2007
[3]谭厚章,熊英莹,王毅斌.湿式相变凝聚技术协同湿式电除尘器脱除微细颗粒物研究[J].工程热物理学报,2016,37(12):2710-2715Tan H Z, Xiong Y Y, Wang Y B, et al. Investigation on Fine Particulate Matters Removal by Using Wet Phase Transition Agglomeration Technology Cooperated With Wet Electro Static Precipitator[J]. Journal of Engineering Thermophysics, 2016, 37(12):2710-2715
[4]秦红霞,何鹏.常温下固体颗粒层过滤除尘技术[J].北京科技大学学报,2006, 28(8):771-773Qin H X, He P. The Technology of Filter Dust Removal of Solid Particle Layer under Normal Temperature[J]. Journal of the Beijing University of Science and Technology,2006, 28(8):771-773
[5]黄斌,徐海卫,姚强.可压缩性颗粒层过滤实验研究[J].工程热物理学报,2005, 26(5):891-893Huang B, Xu H W, Yao Q. Experimental Study on Filtration of Compactible Cake[J]. Journal of Engineering Thermophysics, 2005, 26(5):891-893
[6] Xiao G, Wang X H, Zhang J P, et al. Granular Bed Filter:A Promising Technology for Hot Gas Clean-up[J].Powder Technology, 2013, 244(8):93-99
[7] He H H, Qin X, Cang D Q. Application and Research of High Temperature Granular Bed in Dust Removal[J].Environmental Science Trends, 2005, 4(1):38-41
[8] Chen Y S, Hsiau S S, Lee H Y, et al. Filtration of Dust Particulates Using a New Filter System with Louvers and Sublouvers[J]. Fuel, 2012, 99(9):118-128
[9] Chen Y S, Hsiau S S, Lai SC, et al. Filtration of Dust Particulates with a Moving Granular Bed Filter[J]. Journal of Hazardous Materials, 2009, 171(1-3):987-994
[10] Paenpong C, Pattiya A. Filtration of Fast Pyrolysis Char Fines with a Cross-flow Moving-bed Granular Filter[J].Powder Technology, 2013, 245(9):233-240
[11] Shi K Y, Yang G H, Huang S, et al. Study on Filtering Characteristics of Aerosol Particulates in a Powder-grain Dual-layer Granular Bed[J]. Powder Technology, 2015,272(3):54-63
[12] Walate S A, Takahashi T, ChiTien. Effect of Particle Deposition on Granular Aerosol Filtration[J]. Aerosol Science and Technology, 1986, 5(1):23-27
[13]付海明,亢燕铭.粉尘沉积形成滤饼结构的分形研究[J].过滤与分离,2008, 18(2):4-7Fu H M, Kang Y M. Dust Deposition Forms the Fractal Study of Filter Cake Structure[J]. Filtration and Separation, 2008, 18(2):4-7
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