洁净煤技术

2020, v.26;No.128(04) 11-20

[打印本页] [关闭]
本期目录(Current Issue) | 过刊浏览(Past Issue) | 高级检索(Advanced Search)

燃煤电厂脱硫废水零排放技术现状与发展
Present situation and development of zero-discharge technology for desulfurization wastewater in coal-fired power plants

吕武学;于燕飞;曲保忠;陈嘉宁;崔凌霄;马双忱;
LYU Wuxue;YU Yanfei;QU Baozhong;CHEN Jianing;CUI Lingxiao;MA Shuangchen;Huaneng Weihai Power Co.,Ltd.;Department of Environmental Science and Engineering,North China Electric Power University;University of Illinois at Urbana-Champaign;

摘要(Abstract):

燃煤电厂脱硫废水存在水质差、水量大、处理成本高等问题,废水处理技术也在不断更新换代。不同电厂其脱硫废水的水质、水量相差较大,处理技术的选择也存在较大区别,为了更科学有效地选择脱硫废水处理技术,汇总分析了目前燃煤电厂脱硫废水处理技术,根据实际案例详细分析各处理技术的优缺点,为燃煤电厂对脱硫废水零排放技术的选择提供参考。研究结果显示,目前燃煤电厂脱硫废水零排放处理技术主要包括脱硫废水的预处理技术、浓缩减量技术、蒸发结晶技术以及转移固化技术,各废水零排放处理技术参差不齐。详细分析了预处理技术中的三联箱法、双碱法,根据废水特点,该预处理环节可省略,以减少投资成本;浓缩减量技术包含膜法浓缩(RO、FO、ED等)和热法浓缩(利用蒸汽浓缩、烟气余热浓缩),膜法浓缩可实现较高的浓缩倍率且系统稳定,但其较高的投资运行成本有待解决;热法浓缩依靠其低成本、高效率逐渐成为主流浓缩技术。蒸发结晶技术利用烟气余热蒸发(旁路烟道蒸发、烟道蒸发),其运行中的腐蚀、结垢问题有待解决;转移固化技术中的水泥化固定技术,不仅能够固定脱硫废水中的高浓度氯离子,同时对废水中的多种重金属离子具有较好的固定效果,该技术对处理产生的终端高浓度含盐水指明去处,其固化体得以二次利用;高浓度氯离子也可制备净水剂,实现废水中盐分的二次利用。同时,提出了脱硫废水处理技术选择的四原则。低成本、低风险、高成效的脱硫废水零排放工艺路线更符合当前企业需求。
Desulfurization wastewater from coal-fired power plant has problems such as poor water quality,large water volume,and high treatment cost.The wastewater treatment technology is also constantly updated.The water quality and quantity of desulfurization wastewater of different power plants are also greatly different,and there are also big differences in the choice of treatment technology.In order to choose the desulfurization wastewater treatment technology more scientifically and effectively,the current desulfurization wastewater treatment technology of coal-fired power plants was summarized and analyzed,and the advantages and disadvantages of various treatment technologies were analyzed in detail according to the actual case.It provides a reference for coal-fired power plants to choose the zero-discharge technology of desulfurization wastewater. The research results show that the current zero-emission treatment technology for desulfurization wastewater of coal-fired power plants mainly includes: pretreatment technology for desulfurization wastewater,concentration and reduction technology,evaporative crystallization technology and transfer solidification technology,and the zero-emission treatment technologies of various wastewater are uneven.The triple tank method and double-alkali method in the pretreatment technology were analyzed in detail.According to the characteristics of the wastewater,the pretreatment link can be omitted,which can be omitted to reduce the investment cost.Concentration reduction technology includes membrane concentration( RO,FO,ED,etc.) and thermal concentration( using steam concentration,flue gas waste heat concentration).Membrane concentration can achieve a higher concentration ratio and system stability,but its higher investment and operating cost needs to be resolved.Thermal concentration has gradually become the mainstream concentration technology due to its low cost and high efficiency. The evaporative crystallization technology uses flue gas waste heat evaporation( bypass flue gasification,flue gasification),and the problems of corrosion and scaling in its operation need to be resolved.The cementing and fixing technology in the transfer and solidification technology not only can fix the high concentration of chloride ions in the desulfurization wastewater,but also have a good fixing effect on various heavy metal ions in the wastewater.The technology points out the place of the terminal high concentration brine produced by the treatment,and the solidified body can be reused.High concentration chloride ion can also be used to prepare water purifying agent to realize the secondary utilization of wastewater.At the same time,four principles for the selection of desulfurization wastewater treatment technology were proposed.The low-cost,low-risk and high-efficiency desulfurization wastewater zero-discharge process route is more in line with the current needs of enterprises.

关键词(KeyWords): 脱硫废水;零排放;预处理;烟气蒸发;余热浓缩;水泥固化
desulfurization wastewater;zero liquid discharge(ZLD);pretreatment;flue gas evaporation;residual heat concentration;cement solidification

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 吕武学;于燕飞;曲保忠;陈嘉宁;崔凌霄;马双忱;
LYU Wuxue;YU Yanfei;QU Baozhong;CHEN Jianing;CUI Lingxiao;MA Shuangchen;Huaneng Weihai Power Co.,Ltd.;Department of Environmental Science and Engineering,North China Electric Power University;University of Illinois at Urbana-Champaign;

Email:

DOI: 10.13226/j.issn.1006-6772.19040404

参考文献(References):

文章评论(Comment):

序号(No.) 时间(Time) 反馈人(User) 邮箱(Email) 标题(Title) 内容(Content)
反馈人(User) 邮箱地址(Email)
反馈标题(Title)
反馈内容(Content)
扩展功能
本文信息
服务与反馈
本文关键词相关文章
本文作者相关文章
中国知网
分享