Promoting the agglomeration and removal of coal-fired fine particles by coupling of chemical and turbulent agglomeration

doi:10.11949/0438-1157.20191021

Abstract

Abstract:

By coupling the chemical agglomeration and turbulent agglomeration technology, the agglomeration and removal characteristics of coal-fired fine particles under the coupling effect of chemical and turbulent agglomeration, as well as the influence of particle concentration, flue gas temperature, flow rate of chemical agglomeration solution and flue gas velocity on them were studied experimentally. The results show that the chemical turbulence coupling agglomeration can further promote the agglomeration and growth of fine particles and the removal of fine particles by electrostatic procipitator under typical conditions, and its effect is better than that of the chemical turbulence agglomeration alone. With the increase of fine particle concentration, the agglomeration and removal efficiency decreased gradually, from 49.2% and 96.7% to 35.3% and 88.2% respectively. With the increase of flue gas temperature and flow rate of chemical agglomeration solution, the agglomeration and removal efficiency of fine particles first increased and then decreased, and they reached the maximum value at 180℃ and 12 L/h, which were 44.7% and 94.8%. With the increase of flue gas velocity, the agglomeration and removal efficiency of fine particles increased gradually, from 30.5% and 86.3% to 50.2% and 97.5% respectively.

Key words: aerosol, agglomeration, chemical spray, turbulent flow, coupling, removal

摘要：

将化学团聚与湍流团聚技术耦合，实验研究了燃煤细颗粒物在化学与湍流团聚耦合作用下的团聚与脱除效果，以及颗粒物浓度、烟气温度、团聚液喷入量与烟气流速等因素对细颗粒物团聚与脱除效果的影响规律。结果表明，典型工况下化学-湍流耦合团聚能够进一步促进细颗粒物团聚长大以及静电除尘器对细颗粒物的脱除，其作用效果优于单独的化学与湍流团聚。随细颗粒物浓度的升高，团聚与脱除效率均逐渐下降，分别由49.2%与96.7%下降至35.3%与88.2%。随烟气温度与团聚液喷入量的增加，细颗粒物团聚与脱除效率均先升高后降低，并在180℃与12 L/h处达到最高值，团聚与脱除效率分别为44.7%与94.8%。随烟气流速的增加，细颗粒物团聚与脱除效率均逐渐升高，分别由30.5%与86.3%升高至50.2%与97.5%。

关键词: 气溶胶, 团聚, 化学喷雾, 湍流, 耦合, 脱除

CLC Number:

X 51

Zongkang SUN, Xiaodan ZHANG, Linjun YANG, Shuai CHEN, Xin WU. Promoting the agglomeration and removal of coal-fired fine particles by coupling of chemical and turbulent agglomeration[J]. CIESC Journal, 2020, 71(3): 1317-1325.

孙宗康, 张笑丹, 杨林军, 陈帅, 吴新. 化学与湍流团聚耦合促进燃煤细颗粒物团聚与脱除[J]. 化工学报, 2020, 71(3): 1317-1325.

Figures/Tables 11

Fig.1 Schematic diagram of chemical-turbulent agglomeration experiment system

Fig.2 Size distribution of chemical agglomeration droplets

Fig.3 Structure of turbulent coalescer

Fig.4 Changes in concentration of fine particles

Fig.5 Changes in size distribution of fine particles

Fig.6 Concentration of fine particles at outlet of ESP after different agglomeration modes

Fig.7 Particle stage removal efficiency after different agglomeration modes

Fig.8 Agglomeration and removal efficiency of fine particles at different concentrations

Fig.9 Agglomeration and removal efficiency of fine particles at different flue gas temperatures

Fig.10 Agglomeration and removal efficiency of fine particles at different flow rates of chemical solution

Fig.11 Agglomeration and removal efficiency of fine particles at different flue gas velocities

References 32

1	BP. BP Statistical review of world energy 2018[EB/OL]. [2018-07-30]. .
2	滕吉文, 乔勇虎, 宋鹏汉. 我国煤炭需求、探查潜力与高效利用分析[J]. 地球物理学报, 2016, 59(12): 4633-4653.
	Teng J W, Qiao Y H, Song P H. Analysis of exploration, potential reserves and high efficient utilization of coal in China[J]. Chinese Journal of Geophysics, 2016, 59(12): 4633-4653.
3	中华人民共和国国家统计局. 中国统计年鉴[M]. 北京: 中国统计出版社, 2017: 281-283.
	National Bureau of Statistics of the People s Republic of China. China Statistical Yearbook[M]. Beijing: China Statistics Press, 2017: 281-283.
4	Yin L Q, Niu Z C, Chen X Q, et al. Chemical compositions of PM_2.5 aerosol during haze periods in the mountainous city of Yong an, China[J]. J. Environ. Sci.,2012, 24: 1225–1233.
5	Fan Z, Pun V C, Chen X, et al. Personal exposure to fine particles (PM_2.5) and respiratory inflammation of common residents in Hong Kong[J]. Environ. Res.,2018, 164: 24–31.
6	Li Y J, Wang J H, Ren B N, et al. The characteristics of atmospheric phthalates in Shanghai: a haze case study and human exposure assessment[J]. Atmos. Environ.,2018, 178: 80–86.
7	徐杰英, 刘晶, 郑楚光. 燃烧源超细颗粒物的研究进展[J]. 煤炭转化, 2003, 26(4): 16-20.
	Xu J Y, Liu J, Zheng C G. Advance in the research of ultrafine particulate matter from combustion[J]. Coal Conversion, 2003, 26(4): 16-20.
8	岳勇, 陈雷, 姚强, 等. 燃煤锅炉颗粒物粒径分布和痕量元素富集特性实验研究[J]. 中国电机工程学报, 2005, 25(18): 74-79.
	Yue Y, Chen L, Yao Q, et al. Experimental study on characteristics of particulate matter size distribution and trace elements enrichment in emission from a pulverized coal-fired boiler[J]. Proceedings of the CSEE, 2005, 25(18): 74-79.
9	Pui Y H, Chen S C, Zuo Z L. PM_2.5 in China: measurements, sources, visibility and health effects, and mitigation[J]. Particuology, 2014, 13: 1-26.
10	熊桂龙, 李水清, 陈晟, 等. 增强PM_2.5脱除的新型电除尘技术的发展[J]. 中国电机工程学报, 2015, 35(9): 2217-2223.
	Xiong G L,Li S Q,Chen S, et al. Development of advanced electrostatic precipitation technologies for reducing PM_2.5 emissions from coal-fired power plants[J]. Proceedings of the CSEE, 2015, 35(9): 2217-2223.
11	陈冬林, 吴康, 曾稀. 燃煤锅炉烟气除尘技术的现状及进展[J]. 环境工程, 2014, 32(9): 70-73.
	Chen D L, Wu K, Zeng X. Review on technology for dust removal from flue gas of coal-fired boilers[J]. Environmental Engineering, 2014, 32(9): 70-73.
12	李海英, 张春奇, 刘东. 细颗粒物PM_2.5团聚除尘技术的研究进展[J]. 环境工程, 2018, 36(9): 93-99.
	Li H Y, Zhang C Q, Liu D. Research progress of PM_2.5 agglomeration and removal technology[J]. Environmental Engineering, 2018, 36(9): 93-99.
13	程治良, 谭其祥, 李瑞恒, 等. 工业细粒物PM_2.5预团聚及去除新技术研究进展[J]. 重庆理工大学学报(自然科学), 2016, 30(6): 75-82.
	Cheng Z L, Tan Q X, Li R H, et al. Review on pre-agglomeration and new removal methods of industrial fine particulate matter[J]. Journal of Chongqing University of Technology (Natural Science), 2016, 30(6): 75-82.
14	张光学, 朱颖杰, 周涛涛, 等. 喷雾对促进细颗粒物声波团聚的影响[J]. 化工学报, 2017, 68(3): 864-869.
	Zhang G X, Zhu Y J, Zhou T T, et al. Improve acoustic agglomeration of fine particles by droplet spray[J]. CIESC Journal, 2017, 68(3): 864-869.
15	颜金培, 陈立奇, 杨林军. 燃煤细颗粒在过饱和氛围下声波团聚脱除的实验研究[J]. 化工学报, 2014, 65(8): 3243-3249.
	Yan J P, Chen L Q, Yang L J. Agglomeration removal of fine particles at super-saturation steam by using acoustic wave[J]. CIESC Journal, 2014, 65(8): 3243-3249.
16	熊桂龙, 杨林军, 颜金培, 等. 用蒸汽相变脱除燃煤湿法脱硫净烟气中细颗粒物[J]. 化工学报, 2011, 62(10): 2932-2938.
	Xiong G L, Yang L J, Yan J P, et al. Removal of fine particles by heterogeneous condensation from wet-process desulfurized flue gas[J]. CIESC Journal, 2011, 62(10): 2932-2938.
17	吴建东, 刘乔, 王昊. 带绕流板的湍流管道内细颗粒物沉积实验[J]. 化工学报, 2018, 69: 15-19.
	Wu J D, Liu Q, Wang H. Experimental investigation of fine particle precipitation in rectangular duct with staggered baffles[J]. CIESC Journal, 2018, 69: 15-19.
18	李永旺, 吴新, 赵长遂, 等. 均匀磁场中磁种聚并脱除燃煤PM₁₀实验研究[J]. 中国电机工程学报, 2007, 27(17): 23-28.
	Li Y W, Wu X, Zhao C S, et al. Experimental study on aggregation of PM₁₀ from coal combustion by magnetic seeding in uniform magnetic field[J]. Proceedings of the CSEE, 2007, 27(17): 23-28.
19	刘勇, 赵汶, 刘瑞, 等. 化学团聚促进电除尘脱除PM_2.5的实验研究[J]. 化工学报, 2014, 65(9): 3609-3616.
	Liu Y, Zhao W, Liu R, et al. Improving removal of PM_2.5 by electrostatic precipitator with chemical agglomeration[J]. CIESC Journal, 2014, 65(9): 3609-3616.
20	胡斌, 刘勇, 杨春敏, 等. 化学团聚促进电除尘脱除烟气中PM_2.5和SO₃[J]. 化工学报, 2016, 67(9): 3902-3909.
	Hu B, Liu Y, Yang C M, et al. Simultaneous control of PM_2.5 and SO₃ by chemical agglomeration collaborative electrostatic precipitation[J]. CIESC Journal, 2016, 67(9): 3902-3909.
21	郭沂权, 赵永椿, 李高磊, 等. 300MW燃煤电站化学团聚强化飞灰细颗粒物排放控制的研究[J]. 中国电机工程学报, 2019, 39(3): 754-763.
	Guo Y Q, Zhao Y C, Li G L, et al. Research on emission characteristics of chemical agglomeration of fly ash fine particles from a 300MW coal-fired power plant boiler[J]. Proceedings of the CSEE, 2019, 39(3): 754-763.
22	陈冬林, 杨陈好, 吴康, 等. 烟气参数对细颗粒湍流聚并的影响[J]. 环境工程学报, 2017, 11(9): 5084-5090.
	Chen D L, Yang C H, Wu K, et al. Influences of turbulent agglomeration of fine particles under flue gas parameters[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5084-5090.
23	孙德帅, 郭庆杰, 司崇殿. 气体射流作用下燃煤可吸入颗粒的团聚[J]. 过程工程学报, 2009, 9(3): 437-440.
	Sun D S, Guo Q J, Si C D. Agglomeration of inhalable particles in gas jet[J]. The Chinese Journal of Process Engineering, 2009, 9(3): 437-440.
24	章鹏飞, 米建春, 潘祖明. 烟气流速和装置元件角度对细颗粒湍流聚并的影响[J]. 中国电机工程学报, 2016, 36(10): 2714-2719.
	Zhang P F, Mi J C, Pan Z M. Influences of flue-gas velocity and device-element angle on fine particle amalgamation[J]. Proceedings of the CSEE, 2016, 36(10): 2714-2719.
25	章鹏飞, 米建春, 潘祖明. 装置元件排列间距和颗粒浓度对细颗粒湍流聚并的影响[J]. 中国电机工程学报, 2016, 36(6): 1625-1632.
	Zhang P F, Mi J C, Pan Z M. Influences of elemental arrangement and particle concentration on fine particle amalgamation[J]. Proceedings of the CSEE, 2016, 36(6): 1625-1632.
26	Sun Z K, Yang L J, Shen A, et al. Improving the removal of fine particles from coal combustion in the effect of turbulent agglomeration enhanced by chemical spray[J]. Fuel,2018, 234: 558–566.
27	Ylätalo S, Kauppinen E, Hautanen J, et al. On the determination of electrostatic precipitator efficiency by differential mobility analyzer[J]. J. Aerosol. Sci., 1992, 23(Supplement 1): 795–798.
28	靳星. 静电除尘器内细颗粒物脱除特性的技术基础研究[D]. 北京: 清华大学, 2013.
	Jin X. Research on the capture technology of fine particles in electrostatic precipitator[D]. Beijing: Tsinghua University, 2013.
29	赵永椿, 张军营, 魏凤, 等. 燃煤超细颗粒物团聚促进机制的实验研究[J]. 化工学报, 2007, 58(11): 2876-2881.
	Zhao Y C, Zhang J Y, Wei F, et al. Experimental study on agglomeration of submicron particles from coal combustion[J]. Journal of Chemical Industry and Engineering(China), 2007, 58(11): 2876-2881.
30	刘加勋. 燃煤飞灰化学团聚实验研究及机理分析[D]. 哈尔滨: 哈尔滨工业大学, 2008.
	Liu J X. Experimental study and mechanism analysis on particle spray agglomeration from coal combustion[D]. Harbin: Harbin Institute of Technology, 2008.
31	章澄昌, 周文贤. 大气气溶胶教程[M]. 北京: 气象出版社, 1995: 117-123.
	Zhang C C, Zhou W X. Aerosol Tutorial[M]. Beijing: Meteorlogy Press, 1995: 117-123.
32	杨振楠, 郭庆杰. 气固射流作用下可吸入燃煤飞灰颗粒的团聚[J]. 高校化学工程学报, 2011, 25(2): 71-75.
	Yang Z N, Guo Q J. Agglomeration of coal combustion fly ash inhalable particles in presence of gas-solid jet flow[J]. Journal of Chemical Engineering of Chinese Universities, 2011, 25(2): 71-75.

[1]	Jiahao SONG, Wen WANG. Study on coupling operation characteristics of Stirling engine and high temperature heat pipe [J]. CIESC Journal, 2023, 74(S1): 287-294.
[2]	Kaixuan LI, Wei TAN, Manyu ZHANG, Zhihao XU, Xuyu WANG, Hongbing JI. Design of cobalt-nitrogen-carbon/activated carbon rich in zero valent cobalt active site and application of catalytic oxidation of formaldehyde [J]. CIESC Journal, 2023, 74(8): 3342-3352.
[3]	Enzhe BI, Shuangxi LI, Lianxiang SHA, Dengyu LIU, Kaifang CHEN. Multi-objective optimization analysis of high temperature dynamic pressure split ring seal parameters [J]. CIESC Journal, 2023, 74(6): 2565-2579.
[4]	Jianhua ZHANG, Mengmeng CHEN, Yawen SUN, Yongzhen PENG. Efficient nitrogen and phosphorus removal from domestic wastewater via simultaneous partial nitritation and phosphorus removal combined Anammox [J]. CIESC Journal, 2023, 74(5): 2147-2156.
[5]	Hao GU, Fujian ZHANG, Zhen LIU, Wenxuan ZHOU, Peng ZHANG, Zhongqiang ZHANG. Desalination performance and mechanism of porous graphene membrane in temporal dimension under mechanical-electrical coupling [J]. CIESC Journal, 2023, 74(5): 2067-2074.
[6]	Chuanbao XIAO, Linyang LI, Wufeng LIU, Nianbing ZHONG, Quanhua XIE, Dengjie ZHONG, Haixing CHANG. Effective removal of 2,4,6-trichlorophenol by coupling photocatalysis with ion exchange adsorption [J]. CIESC Journal, 2023, 74(4): 1587-1597.
[7]	Jinsheng REN, Kerun LIU, Zhiwei JIAO, Jiaxiang LIU, Yuan YU. Research on the mechanism of disaggregation of particle aggregates near the guide vanes of turbo air classifier [J]. CIESC Journal, 2023, 74(4): 1528-1538.
[8]	Hao ZHANG, Huibin XU, Jian GAO, Dihong LIU, Zehua ZHOU. Geldart-D wet particle tilt-fall behavior and its reinforcement [J]. CIESC Journal, 2023, 74(4): 1519-1527.
[9]	Bingguo ZHU, Jixiang HE, Jinliang XU, Bin PENG. Heat transfer characteristics of supercritical pressure CO₂ in diverging/converging tube under cooling conditions [J]. CIESC Journal, 2023, 74(3): 1062-1072.
[10]	Weizheng ZHANG, Jijun ZHAO, Xuezhong MA, Qixuan ZHANG, Yixiang PANG, Juntao ZHANG. Analysis of turbulence effect on face groove cooling performance of high-speed mechanical seals [J]. CIESC Journal, 2023, 74(3): 1228-1238.
[11]	Weiyi SU, Jiahui DING, Chunli LI, Honghai WANG, Yanjun JIANG. Research progress of enzymatic reactive crystallization [J]. CIESC Journal, 2023, 74(2): 617-629.
[12]	Yiping FAN, Chunxi LU. Research progress on dedust scheme of coupling centrifugal force field with moving bed filtration [J]. CIESC Journal, 2023, 74(1): 157-169.
[13]	Xinhua LIU, Zhennan HAN, Jian HAN, Bin LIANG, Nan ZHANG, Shanwei HU, Dingrong BAI, Guangwen XU. Principle and technology of low-NO _x decoupling combustion based on restructuring reactions [J]. CIESC Journal, 2022, 73(8): 3355-3368.
[14]	Jianwei ZHANG, Weifeng GAO, Xin DONG, Ying FENG. Numerical study on vortex characteristics in submerged impinging stream reactor [J]. CIESC Journal, 2022, 73(8): 3553-3564.
[15]	Lianfeng ZHU, Chao WANG, Mengjuan ZHANG, Fangzheng LIU, Xin JIA, Ping AN, Guangwen XU, Zhennan HAN. Fluidized bed two-stage gasification of coal with steam/O₂ for production of low-tar syngas [J]. CIESC Journal, 2022, 73(8): 3720-3730.