Desorption of CO2, SO2, and NH(3)in the vacuum evaporation of desulfurization wastewater
Desorption of CO2, SO2, and NH(3)in the vacuum evaporation of desulfurization wastewater
复制标题
脱硫废水真空蒸发脱附CO2、SO2、NH(3)
DOI：
10.1007/s11356-020-10720-4
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发表时间：
2021
影响因子：
5.8
通讯作者：
Chen Shouyan
中科院分区：
文献类型：
--
作者：
Chen Guifang;Sun Xiaofei;Feng Yunqi;Song Zhanlong;Cui Lin;Mao Yanpeng;Ma Chunyuan;Chen Shouyan
机械蒸汽压缩和多效蒸发是实现脱硫废水零排放的节能高效技术，已被广泛应用。脱硫废水中溶解的弱离子如CO 32-、SO 32-和NH 4+在真空蒸发过程中分别部分转化为CO2、SO2和NH3，从而影响换热和压缩机性能。分析了脱硫废水中CO2、SO2和NH3在真空蒸发条件下的迁移和解吸耦合机理。讨论了温度、压力、反应时间等因素对迁移过程的影响。获得了温度在70 ° C至90 °C之间相关离子的水解和电解平衡常数。结果表明，CO2、SO2和NH3的脱附容量与其各自离子的水解常数之间存在一定的关系。当CO 32-和NH 4+共存时，CO2和NH3的解吸量显著增加，而SO2的解吸量在相同的实验条件下保持较低。实验结果表明，CO2、SO2和NH3的脱附受化学反应控制，符合一级反应动力学。
Mechanical vapor compression and multi-effect evaporation have been widely used in achieving zero discharge of desulfurization wastewater as they are energy-saving and efficient technologies. Solubilized weak ions, such as CO32-, SO32-, and NH4+, in the desulfurization wastewater are partly converted into CO2, SO2,and NH3, respectively, during the vacuum evaporation process, thus affecting the heat exchange and compressor performance. In this study, the migration and coupling mechanism of CO2, SO2, and NH3desorption in desulfurized wastewater under vacuum evaporation were analyzed. The effects of temperature, pressure, reaction time, and other factors on the migration process were discussed. The hydrolysis and electrolytic equilibrium constants of the related ions were obtained for temperatures between 70 and 90 °C. The results demonstrate the relationship between the desorption capacities of CO2, SO2, and NH3and the hydrolysis constants of their respective ions. The desorption of CO2and NH3increased significantly when CO32−and NH4+coexisted, whereas the SO2desorption capacity remained low under the same experimental conditions. The experimental results indicate that the desorption of CO2, SO2, and NH3is controlled by chemical reactions and can be described by first-order reaction kinetics.