Civil and Traffic Engineering |
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Experimental of enhancement of simultaneous removing fine particle by sieve tray spray scrubber |
ZHANG Jun, LI Cun jie, ZHENG Cheng hang, WENG Wei guo, ZHU Song qiang, WANG Ding zhen, GAO Xiang, CEN Ke fa |
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;
2. Zhejiang Provincial Energy Group Company Co., Ltd. Hangzhou 310006, China |
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Abstract A new sieve stray spray scrubber, which can promote the mass transfer of gas-liquid-solid system, was proposed in order to improve the fine particle removal efficiency in wet flue gas desulfurization (FGD) system.A pilot-scale wet FGD system was developed to study the removal characteristics of fine particles.The effects of flue gas flow rate, liquid flow rate, fly-ash loading and particle size on the fine particle removal efficiency were investigated.Results show that the fine particle removal efficiency is higher than 90% under typical working condition, of which the maximum exceeds 95%. The removal efficiency increases with the increase of flue gas flow rate, liquid flow rate and the concentration of particles.The fractional removal efficiency is a V-shaped curve with a minimum at 0.2 to 1.0 μm. The sieve tray spray scrubber has a better performance than the ordinary spray scrubber under the same conditions; the total removal efficiency and removal efficiency at 0.2-1.0 μm can be improved more than 5% and 11%, respectively.
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Published: 01 August 2016
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筛板塔细颗粒物协同脱除特性实验
针对常规喷淋空塔无法满足颗粒物协同控制的难题,提出筛板塔强化传质实现协同脱除的方法.基于湿法烟气脱硫中试试验平台,考察湿法烟气脱硫关键工艺参数,包括烟气流速、浆液喷淋量、飞灰浓度、颗粒粒径等对细颗粒物脱除效率的影响规律,并与喷淋空塔脱除特性进行对比.结果表明,在实验工况下,细颗粒物脱除效率大于90%,最高超过95%|脱除效率随烟气流速、颗粒物浓度及浆液喷淋量的增大而提高.颗粒物分级脱除效率曲线呈“V”形分布特性,在0.2~1.0 μm粒径范围内脱除效率最低|在相同条件下,筛板塔细颗粒物脱除效果显著优于喷淋塔,在0.2~1.0 μm粒径段的脱除效率与总脱除效率较喷淋塔分别提高11%和5%以上.
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[1] GILMOUR P S, BROWN D M, LINDSAY T G, et al. Adverse health effects of PM10 particles: involvement of iron in generation of hydroxyl radical [J]. Occupational and Environmental Medicine, 1996, 53(12): 817-822.
[2] 高翔鹏,徐明厚,姚洪,等. 燃煤锅炉可吸入颗粒物排放特性及其形成机理的试验研究[J]. 中国电机工程学报,2007,27(17): 11-17.
GAO Xiangpeng, XU Minghou, YAO Hong, et al. Experimental study on emission characteristics and formation mechanisms of PM10 from a coalfired boiler [J]. Proceedings of the CSEE, 2007,27(17): 11-17.
[3] 王珲,宋蔷,姚强,等. 电厂湿法脱硫系统对烟气中细颗粒物脱除作用的实验研究[J]. 中国电机工程学报,2008,28(05): 17.
WANG Hui, SONG Qiang, YAO Qiang, et al. Experimental study on removal effect of wet flue gas desulfurization system on fine particles from a coalfired power plant[J]. Proceedings of the CSEE, 2008,28(05): 17.
[4] BRACHERT L, KOCHENBURGER T, SCHABER K. Facing the sulfuric acid aerosol problem in flue gas cleaning: pilot plant experiments and simulation [J]. Aerosol Science and Technology, 2013, 47(10): 1083-1091.
[5] SRIVASTAVA R K, MILLER C A, ERICKSON C, et al. Emissions of sulfur trioxide from coalfired power plants [J]. Journal of the Air & Waste Management Association, 2004, 54(6): 750-762.
[6] MEIJ R, TE WINKEL B. The emissions and environmental impact of PM10 and trace elements from a modern coalfired power plant equipped with ESP and wet FGD [J].Fuel Processing Technology, 2004, 85(6): 641-656.
[7] BAO Jingjing, YANG Linjun, YAN Jinpei, et al. Experimental study of fine particles removal in the desulfurated scrubbed flue gas [J]. Fuel, 2013, 108(11): 73-79.
[8] 鲍静静,杨林军,颜金培,等. 湿法烟气脱硫系统对细颗粒脱除性能的实验研究[J]. 化工学报,2009,60(05): 1260-1267.
BAO Jingjing, YANG Linjun, YAN Jinpei, et al. Performance of removal of fine particles by WFGD system [J]. CIESC Journal, 2009,60(05): 1260-1267.
[9] 熊桂龙,杨林军,颜金培,等.蒸汽相变与撞击流耦合促进细颗粒物脱除[J]. 东南大学学报:自然科学版,2011,41(4): 761-766.
XIONG Guilong, YANG Linjun, YAN Jinpei, et al. Improving removal of fine particles by coupling heterogeneous condensation with impinging streams [J]. Journal of southeast university :Natural Science Edition, 2011,41(4): 761-766.
[10] 赵汶,刘勇,鲍静静,等. 化学团聚促进燃煤细颗粒物脱除的试验研究[J]. 中国电机工程学报,2013,33(20): 525811.
ZHAO Wen, LIU Yong, BAO Jingjing, et al. Experimental research on fine particles removal from flue gas by chemical agglomeration [J]. Proceedings of the CSEE, 2013,33(20): 525811.
[11] KIM H G, KIM H J, LEE M H, et al. Experimental study on the enhancement of particle removal efficiency in spray tower scrubber using electrospray [J]. Asian Journal of Atmospheric Environment, 2014, 8(2): 89-95.
[12] 陈海林,杨春平,甘海明,等. 螺旋型垂直筛板布气的喷射鼓泡脱硫除尘塔的研制和性能[J]. 环境科学学报,2010,30(2): 294-301.
CHEN Hailin, YANG Chunping, GAN Haiming, et al. Development and evaluation of a jet bubble reactor using vertical sieves in a spiral housing as a gas in jet device for dust removal and desulfurization [J]. Acta Scientiae Circumstantiae, 2010, 30(2): 294-301.
[13] WANG Q, CHEN X, GONG X. Theoretical and experimental investigation on the characteristics of fly‐ash scrubbing in a fixed valve tray column [J]. AIChE Journal, 2013, 59(6): 2168-2178.
[14] GARCIA J A, FAIR J R. Distillation sieve trays without downcomers: prediction of performance characteristics [J]. Industrial & Engineering Chemistry Research, 2002, 41(6): 1632-1640.
[15] KRISHNA R, VAN BATEN J M. Modelling sieve tray hydraulics using computational fluid dynamics [J]. Chemical Engineering Research and Design, 2003, 81(1): 27-38.
[16] VAN BATEN J M, KRISHNA R. Modelling sieve tray hydraulics using computational fluid dynamics [J]. Chemical Engineering Journal, 2000, 77(3): 143-151.
[17] WANG Q, CHEN X, GONG X. The particle removing characteristics in a fixed valve tray column [J]. Industrial & Engineering Chemistry Research, 2013, 52(9): 3441-3452.
[18] LEE B K, MOHAN B R, BYEON S H, et al. Evaluating the performance of a turbulent wet scrubber for scrubbing particulate matter [J]. Journal of the Air & Waste Management Association, 2013, 63(5): 499-506.
[19] MEIKAP B C, BISWAS M N. Flyash removal efficiency in a modified multistage bubble column scrubber [J]. Separation and Purification Technology, 2004, 36(3): 177-190.
[20] MEIKAP B C, KUNDU G, BISWAS M N. Prediction of the interfacial area of contact in a variablearea multistage bubble column [J]. Industrial & Engineering Chemistry Research, 2001, 40(26): 6194-6200.
[21] COUGHLIN, ROBERT W. Recent advances in air pollution control [M]. American Institute of Chemical Engineers。 \[S.l.\]. \[s.n.\]. 1974.
[22] DW C. Theoretical comparison of efficiency and power for singlestage and multiplestage particulate scrubbing [J] Atmos Environ, 1967, 10 (11): 1001-1004.
[23] MOOJOUNG M, FARQUHAR G J. Waste treatment and utilization: theory and practice of waste management[M]. Aids, 2015, 29(9): 1119-1120.
[24] CHYLEK P, VIDEEN G, NGO D, et al. Effect of black carbon on the optical properties and climate forcing of sulfate aerosols [J]. Journal of Geophysical Research: Atmospheres, 1995, 1001(D8): 16325-16332.
[25] PARK S H, JUNG C H, JUNG K R, et al. Wet scrubbing of polydisperse aerosols by freely falling droplets [J]. Journal of Aerosol Science, 2005, 36(12): 1444-1458.
[26] KALDOR T G, PHILLIPS C R. Aerosol scrubbing by foam [J]. Industrial & Engineering Chemistry Process Design and Development, 1976, 15(1): 199-206.
[27] KIM H T, JUNG C H, OH S N, et al. Particle removal efficiency of gravitational wet scrubber considering diffusion, interception, and impaction [J]. Environmental Engineering Science, 2001, 18(2): 125-136.
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