脱硫废水烟道蒸发技术蒸发特性实验研究
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摘要
采用PDA实验系统和燃煤热态实验系统,分别研究了不同双流体喷嘴的雾化特性及烟气温度、烟气湿度、氯离子质量浓度和脱硫废水温度等参数对脱硫废水蒸发特性的影响。结果表明:不同喷嘴雾化特性存在一定差异,加工精度更高的喷嘴雾化效果相对较好,大粒径液滴较少,蒸发时间较短;烟气温度对脱硫废水蒸发的影响最大,烟气温度升高可促进液滴蒸发,但粗液滴蒸发时间仍较长,要使脱硫废水进入电除尘器前基本蒸发完毕(停留时间≤0.75 s),则进口烟气温度需在130℃以上;烟气湿度增加,对脱硫废水蒸发有一定抑制作用;氯离子质量浓度和脱硫废水温度对脱硫废水的蒸发基本没有影响;脱硫废水蒸发后,约90%～95%氯离子以无机盐颗粒形式蒸发析出并被除尘器捕捉。
A series of experiments were conducted in a PDA and a hot-state coal-fired test system to study the atomization properties of different two-fluid nozzles, and to analyze the effects of following factors on the evaporation characteristics of desulfurization wastewater, such as the flue gas temperature, flue gas humidity, chloride concentration, and the wastewater temperature, etc. Results show that different nozzles have different atomizing characteristics, and the nozzles with higher precision have better atomizing effects, resulting in fewer droplets of large sizes and shorter evaporation time. Flue gas temperature has the greatest influence on the evaporation of desulfurization wastewater, and the increase of flue gas temperature would accelerate the wastewater evaporation, but the evaporation time of large droplets is still to be long. To let the desulfurization wastewater completely evaporate before entering the electrostatic precipitator,(with residence time ≤0.75 s), the flue gas temperature should be above 130 ℃. The increase of flue gas humidity has a certain inhibitory effect on the evaporation of desulfurization wastewater. The concentration of chloride and the temperature of desulfurization wastewater have little influence on the evaporation of desulfurization wastewater. After the evaporation of desulfurization wastewater, about 90%-95% chloride ions are evaporated into the form of inorganic salt particles, which will be removed by dust collector.
A series of experiments were conducted in a PDA and a hot-state coal-fired test system to study the atomization properties of different two-fluid nozzles, and to analyze the effects of following factors on the evaporation characteristics of desulfurization wastewater, such as the flue gas temperature, flue gas humidity, chloride concentration, and the wastewater temperature, etc. Results show that different nozzles have different atomizing characteristics, and the nozzles with higher precision have better atomizing effects, resulting in fewer droplets of large sizes and shorter evaporation time. Flue gas temperature has the greatest influence on the evaporation of desulfurization wastewater, and the increase of flue gas temperature would accelerate the wastewater evaporation, but the evaporation time of large droplets is still to be long. To let the desulfurization wastewater completely evaporate before entering the electrostatic precipitator,(with residence time ≤0.75 s), the flue gas temperature should be above 130 ℃. The increase of flue gas humidity has a certain inhibitory effect on the evaporation of desulfurization wastewater. The concentration of chloride and the temperature of desulfurization wastewater have little influence on the evaporation of desulfurization wastewater. After the evaporation of desulfurization wastewater, about 90%-95% chloride ions are evaporated into the form of inorganic salt particles, which will be removed by dust collector.
引文
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[11] 马双忱, 于伟静, 贾绍广, 等. 燃煤电厂脱硫废水烟道蒸发产物特性[J]. 动力工程学报, 2016, 36(11): 894-900. MA Shuangchen, YU Weijing, JIA Shaoguang, et al. Properties of flue duct evaporation products by desulfurization waste water in coal-fired power plants[J]. Journal of Chinese Society of Power Engineering, 2016, 36(11): 894-900.
[12] MA Shuangchen, CHAI Jin, CHEN Gongda, et al. Research on desulfurization wastewater evaporation: present and future perspectives[J]. Renewable and Sustainable Energy Reviews, 2016, 58: 1143-1151.
[13] HONJO S, SHINODA T, NAKAYAMA Y, et al. MHI wet-FGD waste water treatment technologies. Paper No.190[R]. Baltimore: Air and Waste Management Association, 2010.
[14] Obayashi. Wastewater treatment method: 2565164 A1[P]. 2013.
[15] 张志荣. 火电厂湿法烟气脱硫废水喷雾蒸发处理方法关键问题研究[D]. 重庆: 重庆大学, 2011.
[16] 马双忱, 柴峰, 吴文龙, 等. 脱硫废水烟道蒸发工艺影响因素实验研究[J]. 环境科学与技术, 2015, 38(12): 297-301, 306. MA Shuangchen, CHAI Feng, WU Wenlong, et al. Experimental research on influencing factors of flue evaporation treatment for desulfurization waste water[J]. Environmental Science & Technology, 2015, 38(12): 297-301, 306.
[17] 吴帅帅, 李红智, 陈鸿伟, 等. 脱硫废水烟道喷雾蒸发过程的数值模拟[J]. 热力发电, 2015, 44(12): 31-36. WU Shuaishuai, LI Hongzhi, CHEN Hongwei, et al. Numerical study on spray evaporation process of desulfurization wastewater in flue duct[J]. Thermal Power Generation, 2015, 44(12): 31-36.
[18] 沈彦成. 喷嘴雾化动态特性数值及实验研究[D]. 上海: 上海交通大学, 2014.
[19] 张殿印, 王纯. 除尘工程设计手册[M]. 北京: 化学工业出版社, 2003: 417-419.
[20] 王宝和, 李群. 单液滴蒸发研究的现状与展望[J]. 干燥技术与设备, 2014, 12(4): 25-31. WANG Baohe, LI Qun. Present status and prospect of studies on single droplet evaporation[J]. Drying Technology & Equipment, 2014, 12(4): 25-31.
[2] 中华人民共和国生态环境保护部. 国务院关于印发水污染防治行动计划的通知[EB/OL]. (2015-04-16) [2017-04-02]. http://zfs.mep.gov.cn/fg/gwyw/201504/t20150416_299146.shtml.
[3] 潘娟琴, 李建华, 胡将军. 火力发电厂烟气脱硫废水处理[J]. 工业水处理, 2005, 25(9): 5-7. PAN Juanqin, LI Jianhua, HU Jiangjun. Power plant waste water treatment by FGD[J]. Industrial Water Treatment, 2005, 25(9): 5-7.
[4] 连坤宙, 陈景硕, 刘朝霞, 等. 火电厂脱硫废水微滤、反渗透膜法深度处理实验研究[J]. 中国电力, 2016, 49(2): 148-152, 175. LIAN Kunzhou, CHEN Jingshuo, LIU Zhaoxia, et al. Experimental study on the reduction treatment of desulfurization wastewater in power plants by membrane[J]. Electric Power, 2016, 49(2): 148-152, 175.
[5] 王鑫. 燃煤电厂湿法烟气脱硫废水零排放处理技术研究[D]. 武汉: 武汉科技大学, 2015.
[6] LEE C I, YANG Wanfa, HSIEH C I. Removal of Cu(II) from aqueous solution in a fluidized-bed reactor[J]. Chemosphere, 2004, 57(9): 1173-1180.
[7] 胡石, 丁绍峰, 樊兆世. 燃煤电厂脱硫废水零排放工艺研究[J]. 洁净煤技术, 2015, 21(2): 129-133. HU Shi, DING Shaofeng, FAN Zhaoshi. Zero release technology of desulfurization waste water in coal-fired power plant[J]. Clean Coal Technology, 2015, 21(2): 129-133.
[8] 康梅强. 脱硫废水烟道蒸发处理工艺系统设计与实验研究[D]. 重庆: 重庆大学, 2013.
[9] 郭静娟. 火电厂脱硫废水烟道处理技术研究[J]. 电力科技与环保, 2014, 30(5): 21-22. GUO Jingjuan.Technology research of WFGD wastewater treatment using fule gas in power plant[J]. Electric Power Environmental Protection, 2014, 30(5): 21-22.
[10] 冉景煜, 张志荣. 不同物性液滴在低温烟气中的蒸发特性数值研究[J]. 中国电机工程学报, 2010, 30(26): 62-68. RAN Jingyu, ZHANG Zhirong. Numerical study on evaporation characteristics of different substance droplet in low temperature flue gas[J]. Proceedings of the CSEE, 2010, 30(26): 62-68.
[11] 马双忱, 于伟静, 贾绍广, 等. 燃煤电厂脱硫废水烟道蒸发产物特性[J]. 动力工程学报, 2016, 36(11): 894-900. MA Shuangchen, YU Weijing, JIA Shaoguang, et al. Properties of flue duct evaporation products by desulfurization waste water in coal-fired power plants[J]. Journal of Chinese Society of Power Engineering, 2016, 36(11): 894-900.
[12] MA Shuangchen, CHAI Jin, CHEN Gongda, et al. Research on desulfurization wastewater evaporation: present and future perspectives[J]. Renewable and Sustainable Energy Reviews, 2016, 58: 1143-1151.
[13] HONJO S, SHINODA T, NAKAYAMA Y, et al. MHI wet-FGD waste water treatment technologies. Paper No.190[R]. Baltimore: Air and Waste Management Association, 2010.
[14] Obayashi. Wastewater treatment method: 2565164 A1[P]. 2013.
[15] 张志荣. 火电厂湿法烟气脱硫废水喷雾蒸发处理方法关键问题研究[D]. 重庆: 重庆大学, 2011.
[16] 马双忱, 柴峰, 吴文龙, 等. 脱硫废水烟道蒸发工艺影响因素实验研究[J]. 环境科学与技术, 2015, 38(12): 297-301, 306. MA Shuangchen, CHAI Feng, WU Wenlong, et al. Experimental research on influencing factors of flue evaporation treatment for desulfurization waste water[J]. Environmental Science & Technology, 2015, 38(12): 297-301, 306.
[17] 吴帅帅, 李红智, 陈鸿伟, 等. 脱硫废水烟道喷雾蒸发过程的数值模拟[J]. 热力发电, 2015, 44(12): 31-36. WU Shuaishuai, LI Hongzhi, CHEN Hongwei, et al. Numerical study on spray evaporation process of desulfurization wastewater in flue duct[J]. Thermal Power Generation, 2015, 44(12): 31-36.
[18] 沈彦成. 喷嘴雾化动态特性数值及实验研究[D]. 上海: 上海交通大学, 2014.
[19] 张殿印, 王纯. 除尘工程设计手册[M]. 北京: 化学工业出版社, 2003: 417-419.
[20] 王宝和, 李群. 单液滴蒸发研究的现状与展望[J]. 干燥技术与设备, 2014, 12(4): 25-31. WANG Baohe, LI Qun. Present status and prospect of studies on single droplet evaporation[J]. Drying Technology & Equipment, 2014, 12(4): 25-31.