The combustion of fossil fuel inevitably results in serious environmental pollutions such as discharging flue gas containing SO2, NO2 and CO2. Thus, efficient flue gas purification techniques, especially for the high-temperature gas purification process, are required to protect the environment as well as the downstream units. The moving bed filter is undoubtedly one of the most effective ways to high-temperature dedust. The collecting particles in moving bed filter are usually anticipated to be used recycling, thereby an effective regenerating method for the collecting particles is particularly needed. In this work, the spouting regenerating for the collecting particles of the moving bed filter was investigated. Therefore, it was necessary to determine the main operating parameters of the spouting regenerator for the collecting particles of the moving bed filter. The experimental research on the regenerating efficiency of the regenerator with the collecting particles containing dust was carried in a large plexiglass cold model experimental setup. The dust-collecting particles mixture was sampled both in the spent collector inclining tube and regenerating inclining tube under different operating conditions. These effects of the operating parameters including the dust/collecting particle ratio, the gas velocity and the circulating particle flux on the regenerating efficiency were investigated, respectively. Besides, the abrasion of collecting particles in the spouting bed was measured. On the other hand, the particle size variation during the regenerating process was also analyzed. By measuring the particle size distribution and the mass frequency of the sampled mixture, the corresponding regenerating efficiency under different operating conditions was obtained. It was found that, the dust/collecting particle ratio, the gas velocity and the circulation flux were all the key operating parameters for regenerating. Increasing the dust/collecting particle ratio and the gas velocity were beneficial to the regenerating efficiency, while increasing the circulating particles flux resulted in an opposite effect. Moreover, the spouting regenerator can achieve the high separation efficiency under the condition of high lifting gas flow velocity. If the gas velocity was too high, the collecting particles would also be brought away with the dust and sequentially, the magnitude of the collecting particles decreased. The spouting regenerating process inevitably led to the collecting particles abrasion and thus a suitable gas velocity was quite vital for the whole regenerating system. Based on the experimental results, the recommended gas velocity was generally 1.1?1.3 times that of the collecting particles.
[1] 张凯利, 张继英.移动床颗粒层颗粒再生系统的试验研究[J].上海劳动保护技术, 2000, (5):28-29 [2]沈祥智.浅析振动筛效率的影响因素[J].现代矿业, 2007, 23(5):86-86 [3] 李健, 褚良银.液液分离水力旋流器研究进展[J].化工装备技术, 1998(5):43-48.[J].化工装备技术, 1998, (5):43-48 [4] 祝京旭, 洪江.喷动床发展与现状[J][J].化学反应工程与工艺, 1997, (2):207-130 [5] Kishan B.Mathur. Spouted Beds[J] 1974:287-299.[J]..Spouted Beds, 1974, :287-299 [6] Epstein N, Grace J R.Spouting of Particulate Solids[M]. Chapter 11 in Handbook of Powder Science and Technology, Fayed M E, OttenLeds. New York: Van Nostrand Reinhold Co, 1984, 509-536. [7] 金涌.喷动床. 流态化工程原理第八章[M]. 北京:清华大学出版社, 1996. [8] Brophy J H, Telford C D.U S Patent 4758375.1988.[J]., 1988, :- [9]Cook H H, Bridgwater J.Segregation in spouted beds[J].Canadian Journal of Chemical Engineering, 2010, 56(5):636-638 [10] 张克, 党武京.颗粒移动床除尘系统喷动再生器的研究[J].环境保护, 1994(6):6-9.[J].环境保护, 1994, (6):6-9 [11] 童景山, 张克.流态化干燥技术[M].北京:中国建筑工业出版社, 1985.11. [12] Benkrid A, Caram H S.Solid Flow in the Annular Region of a Spouted Bed[J]. , 1989, 35: 1328-1336.[J].AIChE J, 1989, (35):1328-1336 [13] Berquin Y F.Method and Apparatus for Granulating Melted Solid and Hardenable Fluid Products.U.S. pat3231413. 1966.[J]., 1966, :- [14]Ye B, Lim C J, Grace J R.Hydrodynamics of Spouted and Spout-Fluidized Beds at High Temperature[J].Can J Chem Eng, 1992, 70(5):840-847 [15]徐建, 鲍晓军, 王诗凝, 等.细颗粒喷动床的流体力学特性[J].化工学报, 2003, 54(5):590-595 [16] Si hong G, Dandan Z, Yiping F, et al.A novel gas-solids separator scheme of coupling cyclone with circulating granular bed filter (C-CGBF)[J][J].Journal of Hazardous Materials, 2018, :- [17] 高思鸿, 张丹丹, 范怡平, 等.气体干法净化旋流吸附耦合设备压降特性[J][J].化工学报, 2018, (5):- [18] A Husain.Integrated power and desalination plant[M]. UK:Oxford, 2003. [19] 卢春喜.催化裂化流态化技术[M]. 中国石化出版社, 2002. [20]孔春林, 黄卫星, 潘永亮, 等.提升管气固两相流中颗粒速度的实验研究[J].四川大学学报, 2002, 34(3):41-45 [21] Chandnani P P.Gas spouting of fine particles[J][J]., 1984, :- [22]Rooney N M, Harrison D.Spouted beds of fine particles[J].Powder Technology, 1974, 9(5):227-230 [23]Lodge J P.Solid-gas separation,vol3,handbook of power technology[J].Atmospheric Environment, 1983, 17(3):673-675 [24] Y S Chen, S SHsiau, J Smid, J F Wu, S M Ma.Removal of dust particlesfrom fuel gas using a moving granular bed filter[J][J].Fuel, 2016, 182:174-187 [25]Cai P, Dong X R, Jin Y, et al.A New Technique for Determining the Hydrodynamic Characteristics of Spouted Beds[J].Can J Chem Eng, 1992, 70(5):835-839 [26]He Y L, Lim C J, Grace J R.Spouted Bed and Spout-Fluid Bed Behaviour in a Column of Diameter 091 m[J].Can J Chem Eng, 1992, 70(5):848-857 [27] Epsteni N, Grace J R.Spouting of Particulate Solids. Chapter 11 in Handbook of Powder Science and Technology[M], Fayed M E, Otten Leds. New York: Van Nostrand Reinhold Co, 1984, 509-536. [28]夏兴祥.高温除尘技术综述[J].化工机械, 2000, 27(1):47-52 [29] Mathur K B, Gishler P E.A Technique for Contacting Gases with Coarse Solid Particles[J][J].AIChE J, 1955, 1:57-164 [30]Chen J, Shi W L, Zhao J, et al.Cold-state spout-fluidizing characteristics of high-carbon ferromanganese powders[J].International Journal of Minerals Metallurgy & Materials, 2011, 18(6):741-747 [31]Moradi, Yeganeh, Salimi.CFD-modeling of effects of draft tubes on operating condition in spouted beds[J].Applied Mathematical Modelling, 2013, 37(4):1851-1859 [32] 王中礼.移动颗粒床过滤除尘技术研究[J]. , 1984(1):1-12.[J].过程工程学报, 1984, (1):1-12 [33] Bao Xiaojun, He Kai' an, Liu Yansheng, Shen Fu.Insight int o distillation/ absorption columns and FCC risers using gamma scanning technique. [J].Chinese J. Chem.Eng, 1995, 3:171-179 [34] L D’Addio, F Di Natale, C Carotenuto, W Balachandran, A Lancia,. Alab-scale system to study submicron particles removal in wet electrostatic scrubbers[J].[J].Chem. Eng. Sci, 2013, (97):176-185 [35] 童景山.流态化干燥技术[M]. 中国建筑工业出版社, 1985.
