随着国家政策和行业标准日趋严格，要求燃煤电厂脱硫废水零排放。 对脱硫废水进行浓缩 减量处理减小了后续零排放处理成本和工作量，是脱硫废水零排放的研究趋势。 利用电厂除尘器 后烟气所携带的低温余热，结合旁路浓缩塔实现对脱硫废水的浓缩减量成为脱硫废水零排放的一 种全新思路。 但由于脱硫废水的高含氯量和强酸性环境，在蒸发浓缩过程中氯挥发迁移会影响后 续吸收塔氯平衡而引发担忧。 介绍了低温烟气浓缩脱硫废水过程中氯化氢挥发的基础理论与研究 现状，通过自制模拟试验台对含氯量高的高盐水蒸发浓缩过程中的氯挥发迁移进行了单因素影响 试验和正交试验。 研究发现，高盐水在蒸发浓缩过程中氯的迁移有气相氯挥发和液相氯携带 2 种 方式，其中液相氯携带为主，占总挥发氯的 70%以上。 烟气温度改变气液间传质系数，是影响氯化 氢气体挥发的主要因素;进气量改变烟气流动速度，是影响液滴携带氯的主要因素，此外 pH 和盐 分倍率也对氯挥发迁移有一定影响。 根据多元氯化氢体系建立高盐水环境下氯化氢的挥发模型， 基于物料平衡原理建立了旁路浓缩塔氯平衡模型，对蒸发浓缩过程中氯化氢气体的挥发进行预测， 预测结果与试验基本一致。 结合试验结果与预测模型，对脱硫废水蒸发浓缩过程氯挥发迁移的调 控提出了建议，为低温烟气浓缩脱硫废水技术提供了理论支持和数据参考。 后续研究可以低温烟 气浓缩脱硫废水技术的实际工程开展现场试验，并对旁路浓缩塔氯挥发迁移对吸收塔的氯水平衡 影响展开研究。

With the increasingly strict national policies and industry standards， coal⁃fired power plants are required to have a zero discharge of desulfurization wastewater. Concentrating and reducing the amount of desulfuriza⁃ tion wastewater reduces the cost and workload of subsequent zero⁃discharge treatment，which is the research direction of zero⁃discharge of desulfurization wastewater. Using the low⁃temperature waste heat carried by the flue gas after the dust collector in the power plant，combined with the bypass concentration tower，the realization of the concen⁃ tration and reduction of desulfurization wastewater has become a new idea of zero discharge of desulfurization wastewater. However，due to the high chlorine content and strong acid environment of desulfurization wastewater，the volatilization and migration of chlorine during the evaporation and concentration process will affect the chlorine balance of the subsequent absorption tower and cause concern. This paper introduces the basic theory and research status of hydrogen chloride volatilization in the process of low⁃temperature flue gas concentration desulfurization wastewater， and conducts some single⁃factor influence experiments and orthogonal experiments on the volatilization and migration of chlorine in the process of evaporation and concentration of high⁃chlorinated brine with high chlorine content through a self⁃made simulation test bench. The study demonstrates that the migration of chlorine in the evaporation and concen⁃ tration process of high brine has two modes:vapor⁃phase chlorine volatilization and liquid⁃phase chlorine carryover，a⁃ mong which liquid⁃phase chlorine carryover is the main method，accounting for more than 70% of the total vola⁃ tile chlorine. The temperature of flue gas changes the gas⁃liquid mass transfer coefficient，which is the main factor af⁃ fecting the volatilization of hydrogen chloride gas. The change of the flow rate of the flue gas by the amount of air in⁃ take is the main factor affecting the chlorine carried by the droplets. In addition，the pH and salt concentration also af⁃ fect the volatilization and migration of chlorine. The volatilization model of hydrogen chloride in high brine environment was established according to the multi⁃component hydrogen chloride system，and the chlorine balance model of the by⁃ pass concentration tower was established based on the principle of material balance，and the volatilization of hydro⁃ gen chloride gas during the evaporation and concentration process was predicted. Combined with the experimental re⁃ sults and prediction models，some suggestions are put forward for the regulation of chlorine volatilization and migra⁃ tion during the evaporative concentration of desulfurization wastewater，which provides a theoretical support and data reference for low⁃temperature flue gas concentration desulfurization wastewater technology. Future research can carry out some field experiments on the actual engineering application of low⁃temperature flue gas concentration desulfuriza⁃ tion wastewater technology，and also conduct some researches on the impact of chlorine volatilization migration in the bypass concentration tower on the chlorine⁃water balance of absorption tower.