Experimental study on the evaporation and chlorine migration of desulfurization wastewater in flue gas
Experimental study on the evaporation and chlorine migration of desulfurization wastewater in flue gas
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脱硫废水烟气蒸发及氯气迁移实验研究
DOI：
10.1007/s11356-018-3816-y
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发表时间：
2018-12
影响因子：
5.8
通讯作者：
Gao Xiang
中科院分区：
文献类型：
--
作者：
Zheng Chenghang;Zheng Hao;Yang Zhengda;Liu Shaojun;Li Xiang;Zhang Youngxin;Weng Weiguo;Gao Xiang
石灰石-石膏湿法脱硫废水悬浮物含量高，水成分复杂，不能直接回用或排放。烟气蒸发脱硫废水是一种有效的废水处理方法。脱硫废水中含有多组分的可溶性氯盐。在蒸发过程中，氯以挥发的形式进入烟气中，加快了脱硫浆液中Cl-−浓度的浓缩速度，导致废水产量增加。采用实验室管式炉和中试系统研究了浓缩废水蒸发过程中不同氯盐溶液和典型脱硫废水在高温下的氯迁移规律。结果表明，氯化钠蒸发物受热时，氯离子几乎不挥发。对于CaCl2和MgCl2溶液的蒸发物，部分结晶水丢失，发生水解生成气态HCl。NH4Cl易升华，分解温度最低。烟气中脱硫废水喷雾蒸发的中试研究表明，随着烟气温度的升高，蒸发产物的粒径增大，主要粒径在2.5~10μm之间。增大气液质量比可显著减小雾化颗粒的颗粒尺寸，从而减小蒸发颗粒的平均颗粒尺寸。HCl浓度随烟气温度升高而增大。以石灰石-石膏湿法脱硫典型废水为例，当烟气温度为350℃，HCl浓度为40ppm时，脱硫废水中氯的逸出率约为30%。
Wastewater from a limestone-gypsum wet desulfurization system cannot be directly reused or discharged due to its high suspended matter content and complex water composition. Desulfurization wastewater evaporation in flue gas is an effective way to dispose wastewater. Multicomponent soluble chlorine salts exist in the desulfurization wastewater. During the evaporation, chlorine enters into the flue gas due to volatilization, which accelerates the enrichment rate of the Cl−concentration in the desulfurization slurry and leads to an increase in wastewater production. This study explored the chlorine migration of various chlorine salt solutions and typical desulfurization wastewater at high temperature during the evaporation process of concentrated wastewater by a laboratory-scale tube furnace and a pilot-scale system. Results showed that when NaCl-evaporated substance was heated, the chlorine ion hardly volatilized. For the evaporated substances of CaCl2and MgCl2solutions, some of the crystal water was lost, and hydrolysis occurred to generate gaseous HCl. NH4Cl was easily sublimed, and the decomposition temperature was lowest. A pilot study on spray evaporation of desulfurization wastewater in flue gas showed that the particle size of the evaporated product increased and the main particle size was within 2.5–10 μm with increasing flue gas temperature. Increasing the mass ratio of gas to liquid significantly reduced the particle size of the atomized particles, thereby reducing the average particle size of the evaporated particles. The HCl concentration increased with increasing flue gas temperature. When the flue gas temperature was 350 °C, the concentration of HCl was 40 ppm, and the escape rate of chlorine in the desulfurization wastewater was approximately 30% using typical wastewater from a limestone-gypsum wet desulfurization system.
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影响因子：
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作者：
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通讯作者：
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作者：
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通讯作者：
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