Formation of fine particles in flue gas desulphurization process using limestone-gypsum

doi:10.11949/j.issn.0438-1157.20150459

Abstract

Abstract:

Using simulated experimental setup for flue gas desulphurization with limestone-gypsum, it was studied and analyzed that the relationship existed between properties of fine particles in flue gas formed in desulphurization process and particle size distribution, concentration, morphology, and elements composition of the limestone-gypsum slurry. The effects of flue gas component and desulphurization operation parameters on the fine particle emission were also experimentally investigated. The results show that large numbers of submicron particles are formed during the desulphurization process and their properties are close related to crystal properties of limestone-gypsum in desulphurization slurry. The desulphurization operation parameters such as empty column gas velocity and liquid-gas ratio have great influence on the quantity of slurry drops carried by flue gas out of the scrubber. The evaporation and entrainment of desulphurization slurry is the main source of fine particles formed during desulphurization and their formation can be reduced by the prevention of fine crystal formation in desulphurization slurry and operation parameter optimization.

Key words: limestone-gypsum desulphurization, fine particle, formation characteristics, particulate processes, simulation, numerical analysis

摘要：

利用石灰石-石膏湿法烟气脱硫模拟试验装置分析探讨脱硫净烟气中细颗粒物物性与脱硫浆液中晶体粒度分布、浓度、形貌及元素组成间的关系,并试验考察了烟气组分及脱硫工艺条件对脱硫净烟气中细颗粒物排放的影响。结果发现:石灰石-石膏湿法烟气脱硫过程中可生成大量亚微米级细颗粒,生成的细颗粒物性与脱硫浆液中晶体物性存在密切关系,脱硫操作参数如空塔气速、液气比等对脱硫浆液液滴夹带量存在显著影响;脱硫浆液蒸发夹带是石灰石-石膏法脱硫过程中生成细颗粒物的主要来源,通过抑制细小石膏晶粒的形成及优化脱硫工艺参数可减少石灰石-石膏湿法脱硫过程中细颗粒的形成。

关键词: 石灰石-石膏法脱硫, 细颗粒物, 形成特性, 颗粒过程, 模拟, 数值分析

CLC Number:

PAN Danping, GUO Yanpeng, HUANG Rongting, SHENG Yi, YANG Linjun. Formation of fine particles in flue gas desulphurization process using limestone-gypsum[J]. CIESC Journal, 2015, 66(11): 4618-4625.

潘丹萍, 郭彦鹏, 黄荣廷, 盛溢, 杨林军. 石灰石-石膏法烟气脱硫过程中细颗粒物形成特性[J]. 化工学报, 2015, 66(11): 4618-4625.

References 20

[1]	Yang Chunxue (杨春雪), Kan Haidong (阚海东), Chen Renjie (陈仁杰). Research on level, composition, source and pollution characteristics of ambient fine particles in China [J]. Journal of Environment and Health (环境与健康杂志), 2011, 28 (8): 735-738, 753.
[2]	Tao Yan (陶燕), Liu Yameng (刘亚梦), Mi Shengquan (米生权), Guo Yongtao (郭勇涛). Atmospheric pollution characteristics of fine particles and their effects on human health [J]. Acta Scientiae Circumstantiae (环境科学学报), 2014, 34 (3): 592-597.
[3]	Chang Yanping (昌艳萍), Geng Chao (耿超), Li Chunlei (李春蕾), Wu Ruilan (武瑞兰), Xue Liuqing (薛柳青). Current situation analysis and new thinking of PM2.5 in air [J]. Environmental Science & Technology (环境科学与技术), 2012, (S1): 151-154.
[4]	Nielsen M T, Livbjerg H, et al. Formation and emission of fine particles from two coal-fired power plants [J]. Combustion Science and Technology, 2002, 174: 79-113.
[5]	Wang Hui (王珲), Song Qiang (宋蔷), Yao Qiang (姚强). Experimental study on removal effect of wet flue gas desulfurization system on fine particles from a coal-fired power plant [J]. Proceedings of the CSEE (中国电机工程学报), 2008, 28 (5): 1-7.
[6]	Meij R, Winkel H. The emissions and environmental impact of PM10 and trace elements from a modern coal-fired power plant equipped with ESP and wet FGD [J]. Fuel Processing Technology, 2004, 85 (6/7): 641-656.
[7]	Zhou Ke (周科), Nie Jianping (聂剑平), Zhang Guangcai (张广才), Yu Dunxi (于敦喜), Xu Minghou ( 徐明厚). Emission characteristics of particulate matter from coal-fired plant equipped with WFGD [J]. Thermal Power Generation (热力发电), 2013, 42 (8): 81-85, 89.
[8]	Bao Jingjing (鲍静静), Yang Linjun (杨林军), Yan Jinpei (颜金培), Liu Jinhui (刘锦辉), Song Shijuan (宋士娟). Performance of removal of fine particles by WFGD system [J]. CIESC Journal (化工学报), 2009, 60 (5): 1260-1267.
[9]	Yan Jinpei, Bao Jingjing, Yang Linjun. The formation and removal characteristics of aerosols in ammonia-based wet flue gas desulfurization [J]. Journal of Aerosol Science, 2011, 42: 604-614.
[10]	Yan Jinpei (颜金培), Yang Linjun (杨林军), Bao Jingjing (鲍静静). Impact property on fine particles from coal combustion in wet flue gas desulfurization process [J]. Journal of Southeast University: Natural Science Edition (东南大学学报: 自然科学版), 2011, 41 (2): 387-391.
[11]	Fu Yu (付昱), He Jinqi (何金起). Discussion about solution of gypsum rain when wet desulphurization used for power plant [J]. Heilongjiang Electric Power (黑龙江电力), 2009, 31 (5): 374-376.
[12]	Luo Jianzhong (雒建中), Gu Xingjun (顾兴俊). Application and technical reform of desulfurization demister in 600 MW power plant [J]. Jiangsu Electrical Engineering (江苏电机工程), 2010, 29 (5): 64-65, 69.
[13]	Yang Zhenming (杨振明), Dang Zhiguo (党志国), Chen Chongming (陈崇明), Song Guosheng (宋国升). Diagnostic analysis and treatment suggestion for wet flue gas desulfurization system [J]. Hebei Electric Power (河北电力技术), 2012, 31 (2): 52-54.
[14]	Zhou Hongguang (周洪光), Li Yanbing (李延兵). Control measures and effect of gypsum rain and mist in thermal power plant with FGD [J]. Electric Power Environmental Protection (电力科技与环保), 2014, 30 (6): 34-37.
[15]	Xiong Guilong (熊桂龙), Yang Linjun (杨林军), Yan Jinpei (颜金培), Bao Jingjing (鲍静静), Geng Junfeng (耿俊峰), Lu Bin (陆斌). Removal of fine particles by heterogeneous condensation from wet-process desulfurized flue gas [J]. CIESC Journal (化工学报), 2011, 62 (10): 2932-2938.
[16]	Liu Yong (刘勇), Zhao Wen (赵汶), Liu Rui (刘瑞), Yang Linjun (杨林军).Improving removal of PM2.5 by electrostatic precipitator with chemical agglomeration [J]. CIESC Journal (化工学报), 2014, 65 (9): 3609-3616.
[17]	Geng Junfeng (耿俊峰), Song Shijuan (宋士娟), Bao Jingjing (鲍静静), Yang Linjun (杨林军).Improving performance of WFGD system to remove fine particles by adding wetting agents [J]. CIESC Journal (化工学报), 2011, 62 (4): 1084-1090.
[18]	Zhao Wen (赵汶), Liu Yong (刘勇), Bao Jingjing (鲍静静), Geng Junfeng (耿俊峰), Yang Linjun (杨林军). Experimental research on fine particles removal from flue gas by chemical agglomeration [J]. Proceedings of the CSEE (中国电机工程学报), 2013, 33 (20): 52-58+11.
[19]	Zhao Qinxia (赵琴霞), Chen Zhaomei (陈招妹), Zhou Chaojiong (周超炯), Yin Deshi (尹得仕). Discussion on wet ESP technology and its application prospect in coal-fired power plants [J]. Electric Power Environmental Protection (电力科技与环保), 2012, 28 (4): 24-26.
[20]	Liu Hezhong (刘鹤忠), Tao Qiugen (陶秋根). Exploration application of wet electric dust catcher to engineering [J]. Electric Power Survey & Design (电力勘测设计), 2012, (3): 43-47.