Experimental study on migration and transformation characteristics of Cl- during rotary spray evaporation process of desulfurization wastewater

被引：0
|
作者：
Li F. [1 ,2 ]
机构：
[1] Datang Environment Industry Group Co. Ltd., Beijing
[2] China Datang Corporation Ltd., Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 06期
关键词：
Chloride ion; Desulfurization wastewater; Migration and transformation; Rotary spray evaporation;
D O I：
10.11817/j.issn.1672-7207.2021.06.035
中图分类号：
学科分类号：
摘要：
A rotary spray evaporation experimental system was applied to investigate the migration and transformation characteristics of Cl- during the evaporation of desulfurization wastewater. The results show that the metal cations in the wastewater, the inlet flue gas temperature, the gas-liquid ratio, the pH value of wastewater, and the physical properties of wastewater have significant effects on the migration and transformation of Cl-. Metal cations promote the transformation of Cl- into hydrochloric gas differently, and the strongest is Mg2+ and then is Ca2+ and Na+ respectively. As the inlet flue gas temperature rises from 280℃ to 360℃, the proportion of Cl- transformed into hydrochloric gas increases from 3.48% to 9.69%. The gas-liquid ratio may affect the temperature pattern in the dry tower, and its reduction may result in a decrease of the proportion of Cl- transformed into hydrochloric gas. As the pH value rises from 3 to 10, the proportion of volatilized HCl decreases from 14.32% to 4.18%. The physical properties of wastewater affect the migration and transformation characteristics of Cl- through different pH values of wastewater and the content of ions. © 2021, Central South University Press. All right reserved.
引用
收藏
页码：2052 / 2061
页数：9
相关论文
共 19 条
  • [1] YANG Jianguo, GENG Ziwen, YUAN Weizhong, Et al., The technology of coal-fired flue gas dechlorination for realizing zero-discharge of desulfurization wastewater and its influences on boiler, Proceedings of the CSEE, 38, 9, pp. 2657-2664, (2018)
  • [2] MA Shuangchen, CHAI Feng, WU Wenlong, Et al., Experimental research on influencing factors of flue evaporation treatment for desulfurization wastewater, Environmental Science & Technology, 38, S2, pp. 297-301, (2015)
  • [3] ZHAO Shuran, HAN Xiaoqu, ZHANG Dan, Et al., Thermal cost analysis on themal zero discharge technology for flue gas desulfurization(FGD) wastewater of coal-fired units, Electric Power, 53, 7, pp. 184-188, (2020)
  • [4] XU Qingsong, ZHU Xiang, Application research of rotary spray drying method in desulfurization wastewater of thermal power plant, China Plant Engineering, 8, pp. 156-157, (2020)
  • [5] CHEN Wu, WANG Kailiang, LUO Tianxiang, Et al., Study on rotating spray atomization and drying evaporation characteristics of desulfurization wastewater, Proceedings of the CSEE, 39, 11, pp. 3295-3302, (2019)
  • [6] YU Weijing, Study on FGD wastewater evaporation treatment, School of Environmental Science and Engineering, pp. 9-31, (2016)
  • [7] SHEN Luguang, Study on the desulfurization wastewater evaporation and the synergetic removal of the flue gas pollutants through adjusting the desulfurization water pH value, School of Energy and Power Engineering, pp. 9-36, (2018)
  • [8] ZHOU Zheng, Study on the atomization characteristics of desulfurization wastewater and evaporation release law of HCl, pp. 31-44, (2018)
  • [9] SIMONSON J M, PALMER D A, CATER R W., Et al., Vapor-liquid partitioning of HCI in acidic nacl brines at high temperatures, Geothermal Resources Council Transactions, 22, pp. 141-145, (1998)
  • [10] CUI Lin, SHEN Luguang, YANG Dunfeng, Et al., Drying properties and product characteristics of desulfurization wastewater evaporation by medium-temperature flue gas, Journal of China Coal Society, 42, 7, pp. 1877-1883, (2017)
12