通过冷模实验，改变移动床表观气速、颗粒循环速率、入口气体含尘浓度等操作参数，研究了轴向移动床过滤器的压降特性和合适的操作条件，结合移动床内气固两相运动特点，修正了Ergun公式，在加尘条件下分析了床内滤饼对压降稳定性的影响。结果表明，在无尘负荷条件下(“纯”移动床操作)，颗粒的循环速率由0增至2.26 kg/(m2?s)时，设备的压降减小0.03 kPa。表观气速为0.126 m/s、入口气体含尘浓度为89.10 g/m3时，移动床内滤饼形成和破损呈动态平衡，过滤500 s后，压降可稳定在0.88 kPa，此时设备具有较高的除尘性能，粉尘捕集效率可达96%以上。
The pressure drop characteristics of an axial moving bed were investigated by varying the operating parameters including the superficial activation energy gas velocity, the particle circulation rate and the dust concentration in the inlet gas. The results showed that when the circulation rate of particles increased from 0 to 2.26 kg/(m2?s), the pressure drop of the equipment decreased slightly by 0.03 kPa. Besides, the influence of press cake in bed on the stability of pressure drop was studied under the operating condition of dust load. When the dust concentration in the inlet was low, the dust deposited in the moving bed could not form a stable filter cake structure, and the pressure drop fluctuation of the equipment was considerable. When the inlet gas dust concentration increased to 89.10 g/m3, the formation of filter cake in the moving bed tended to be stable, and the pressure drop operation of the equipment gradually became stable. Under dust load condition, when the equipment was in the fixed bed operation state, the static pressure drop increased rapidly with filtration, and increased with the increase of the dust concentration in the inlet gas, and the pressure drop increased faster. In addition, the pressure drop of the equipment reached a stable state around 500 s, at which time the pressure drop increased by about 0.10?0.14 kPa, and the fluctuation amplitude of the pressure drop after 500 s gradually decreased with the increase of dust concentration. Furthermore, when the superficial activation energy gas velocity was 0.126 m/s and the dust concentration was 89.10 g/m3, the process of press cake forming and damaging present a dynamic balance. After filtering for 500 s, the pressure drop stabled at 0.88 kPa. At the same time, the equipment had a high dust removal performance, and the dust collection efficiency of the equipment was more than 96%.
[1]颜深, 孙国刚, 孙占朋.颗粒床过滤除尘技术研究进展[J].化工进展, 2017, 36(9):3152-3163 [2]刘会雪, 刘有智, 孟晓丽.气体高温除尘技术研究进展[J].煤气与热力, 2008, 28(10):64-68 [3]Smid J, Hsiau S S, Peng C Y, et al.Moving bed filters for hot gas cleanup[J].Filtration & Separation, 2005, 42(6):34-37 [4]夏军仓, 许世森, 郜时旺, et al.移动颗粒层过滤高温高压煤气除尘技术的试验研究[J].动力工程, 2003, 23(2):2337-2341 [5]Ishikawa K, Kamei K, Shindo K.Development of a simultaneous sulfur and dust removal process for IGCC power generation system[J].Fuel and Energy Abstracts, 1999, 40(5):419-435 [6]张立平, 林爱光.气体通过颗粒移动床除尘器压降的计算[J].高校化学工程学报, 1991, 5(4):302-308 [7]陈允华, 朱学栋, 吴勇强.错流移动床的压降特性[J].过程工程学报, 2006, 6(5):697-702 [8]卢春喜, 龙文宇, 林泉志.径向移动床气固流动特性数值模拟[J].高校化学工程学报, 2015, 29(1):49-57 [9]张铁钢.重整再生器轴向移动床两相流动规律的实验研究 [10]李志红.重整再生器轴向移动床内气固两相流动的实验研究 [11]Brown R C, Shi H, Colver G, et al.Similitude study of a moving bed granular filter[J].Powder Technology, 2003, 138(2-3):201-210 [12]El-Hedok I A, Whitmer L, Brown R C.The influence of granular flow rate on the performance of a moving bed granular filter[J].Powder Technology, 2011, 214(1):69-76 [13]Paenpong C, Pattiya A.Filtration of fast pyrolysis char fines with a cross-flow moving-bed granular filter[J].Powder Technology, 2013, 245(8):233-240 [14]吴晋沪.移动床高温煤气除尘基础研究 [15]赵建涛, 黄戒介, 张建民.气固错流移动颗粒床过滤器压降特性研究[J].高校化学工程学报, 2003, 17(2):216-220 [16]单向辉, 刘柏谦, 谭培来, et al.移动颗粒床除尘器的除尘性能 [J]. , (3):1698-1706.[J].环境工程学报, 2017, 11(3):1698-1706 [17]Ergun, S.Fluid Flow through Packed Columns[J].Chemical Engineering Progress, 1952, 48(2):89-94 [18]杨晨, 徐祥, 阳绍军.加压下颗粒移动床空隙率实验研究[J].中国粉体技术, 2017, 23(04):22-26 [19]陶贺.错流移动床内气固两相流动特性的研究[J].科学技术与工程, 2014, 14(11):103-106
