Experimental study on the influences of recycled high salt water on desulfurization efficiency

doi:10.16085/j.issn.1000-6613.2016.s1.049

Abstract

Abstract: Due to the stringent control on water pollution, the high salt water is recycled to be used in the FGD system in many power plants.But the impact of the recycled water on FGD system remains unknown.Thus the influence of the brackish water on desulfurization efficiency was studied in this research.The impacts of NaCl, MgCl₂, MgNO₃ and other compounds on desulfurization were explored on designed device.The combined impacts of different compounds on desulfurization were studied as well.The result showed that, the critical concentration of Cl^- and NO₃^- were 2.46mol/L and 3.12mol/L respectively, and they may cause serious influence on the desulfurization efficiency if the concentration is over the edge.Cl^- was found to be the most influencing factor; therefore measures should be taken to control its concentration.F^- at low concentration can enhance desulfurization efficiency to some extent.This study offered valuable information for the application of water recycling in FGD.

Key words: waste water, zero discharge, desulfurization efficiency

摘要： 随着国家水污染控制力度的加强,很多电厂将各种含盐水回用于湿法烟气脱硫系统,但高盐水对脱硫系统的影响却少见研究,由此,本文就高盐水回用于脱硫系统后对脱硫系统的影响展开研究。在自制实验台上分别考察了脱硫浆液中存在氯化钠、氯化镁、硝酸镁、氟化钠等盐类对脱硫效率的影响,并研究了多种盐离子共存时的影响。研究显示,Cl^-和NO₃^-的临界浓度分别为2.46mol/L和3.12mol/L,超过此浓度后对浆液脱硫效率影响较大。其中Cl^-对浆液脱硫效率的影响最大,脱硫系统运行过程中应重点对氯离子浓度进行监控。而低浓度的氟离子对脱硫效率有一定的促进作用。本研究结果对高盐水回用于脱硫系统提供了有价值的信息。

关键词: 废水, 零排放, 脱硫效率

CLC Number:

X703

MA Shuangchen, ZHU Sijie, ZHAO Xinghui, ZHOU Chaoyang, WU Wei, WENG Xiaoyu, CHEN Rujia. Experimental study on the influences of recycled high salt water on desulfurization efficiency[J]. Chemical Industry and Engineering Progree, 2016, 35(S1): 304-310.

马双忱, 朱思洁, 赵兴辉, 周朝阳, 吴伟, 翁小玉, 陈儒佳. 回用高浓度盐水对脱硫效率的影响[J]. 化工进展, 2016, 35(S1): 304-310.

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