烟气喷雾蒸发在火电厂脱硫废水零排放中的应用
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摘要
针对传统脱硫废水零排放工艺存在流程长、投资高、运行费用高和维护困难等局限,通过烟气喷雾蒸发技术进行脱硫废水零排放工程实践,确定了控制雾化液滴直径、合理优化布置雾化喷嘴、烟气质量焓、准确计算喷入脱硫废水后烟气及粉煤灰特性变化是本技术的关键点。实际运行结果表明,在不同机组负荷情况下,不同量的脱硫废水可以完全蒸干,喷入脱硫废水的烟气粉煤灰中Cl~-含量仅增加了0.15%,烟气相对湿度增加0.5%,对后续工艺无负面影响,同时还提高电除尘器的除尘效率。该技术是一种工艺流程短、投资少、运行费用低的脱硫废水零排放可行性技术。
The conventional FGD wastewater zero liquid discharge(ZLD) processes have many limitations, such as long process, high investment, high operating cost, difficult maintenance. Through engineering practice of flue gas spray dryer evaporation technology, key operation parameters were obtained,such as the atomization droplet diameter, optimization atomizing nozzle layout, flue gas massic enthalpy, accurate calculation on the change of flue gas and fly ash characteristics after the injection of FGD wastewater. The actual operation results indicated that under different load conditions, different amount of FGD wastewater could be completely dried, the Cl-content in fly ash only increased 0.15% in fly ash, and the relative humidity of flue gas had increased 0.5%, and had no negative impacts on the subsequent process, and the efficiency of electrostatic precipitator improved at the same time. This process was a feasible technology for ZLD of FGD wastewater with characteristics of short process, less investment and low operating cost.
The conventional FGD wastewater zero liquid discharge(ZLD) processes have many limitations, such as long process, high investment, high operating cost, difficult maintenance. Through engineering practice of flue gas spray dryer evaporation technology, key operation parameters were obtained,such as the atomization droplet diameter, optimization atomizing nozzle layout, flue gas massic enthalpy, accurate calculation on the change of flue gas and fly ash characteristics after the injection of FGD wastewater. The actual operation results indicated that under different load conditions, different amount of FGD wastewater could be completely dried, the Cl-content in fly ash only increased 0.15% in fly ash, and the relative humidity of flue gas had increased 0.5%, and had no negative impacts on the subsequent process, and the efficiency of electrostatic precipitator improved at the same time. This process was a feasible technology for ZLD of FGD wastewater with characteristics of short process, less investment and low operating cost.
引文
[1]马双忱,温佳琪,万忠诚,等.中国燃煤电厂脱硫废水处理技术研究进展及标准修订建议[J].洁净煤技术,2017,23(4):18-28,35.
[2]火电厂石灰石-石膏湿法脱硫废水水质控制指标:DL/T 997-2006[S].
[3]刘进.火力发电厂废水零排放技术方案[J].华电技术,2017,39(9):58-62.
[4]中华人民共和国环境保护部.火电厂污染防治技术政策[A/OL].(2017-01-10)[2018-02-18]. http://bz.mep.gov.cn/bzwb/wrfzjszc/.
[5]火电厂污染防治最佳可行技术指南:HJ 2301-2017[S].
[6]火力发电厂燃烧系统设计计算技术规程:DL/T 5240-2010[S].
[7]晋银佳,王帅,姬海宏,等.深度过滤-烟道蒸发处理脱硫废水的数值模拟[J].中国电力,2016,49(12):174-179.
[8]通用硅酸盐水泥:GB 175-2007[S].
[2]火电厂石灰石-石膏湿法脱硫废水水质控制指标:DL/T 997-2006[S].
[3]刘进.火力发电厂废水零排放技术方案[J].华电技术,2017,39(9):58-62.
[4]中华人民共和国环境保护部.火电厂污染防治技术政策[A/OL].(2017-01-10)[2018-02-18]. http://bz.mep.gov.cn/bzwb/wrfzjszc/.
[5]火电厂污染防治最佳可行技术指南:HJ 2301-2017[S].
[6]火力发电厂燃烧系统设计计算技术规程:DL/T 5240-2010[S].
[7]晋银佳,王帅,姬海宏,等.深度过滤-烟道蒸发处理脱硫废水的数值模拟[J].中国电力,2016,49(12):174-179.
[8]通用硅酸盐水泥:GB 175-2007[S].