Method and system for processing desulphurization waste water

Abstract

The invention discloses a method and a system for treating desulfurization wastewater, which are applied to treating the wastewater generated from limestone-plaster wet flue gas desulfurization and other wastewater with high salt content. The system comprises a drying tower, a circular spray system, a flue gas stirring device and a filter press. The method comprises the steps: in the drying tower, hot flue gas and desulfurization wastewater exchange heat through convection contact so as to lead the wastewater to evaporate and concentrate to generate crystal; the filter press is adopted to carry out solid-liquid separation; and mother liquor continually refluxes and is treated. The method and the system have the advantages of low cost, little area occupation and low energy consumption, which can realize zero discharge of the wastewater of the limestone-plaster wet flue gas desulfurization technology and improve contribution.

Description

technical field [0001] The invention discloses a method and system for treating desulfurization wastewater, which is particularly suitable for treating wastewater produced by limestone-gypsum wet flue gas desulfurization, and is also suitable for treating wastewater with high salt content. Background technique [0002] There are more than 200 desulfurization technologies studied internationally, which are divided into three forms, namely desulfurization before combustion, desulfurization during combustion, and desulfurization after combustion. Only the third type is the only large-scale commercial application technology in the world. The third form is divided into wet method, dry method and semi-dry method according to the form of desulfurizer; and the most important flue gas desulfurization technology in wet method is the wet limestone / lime method in the United States and the wet limestone / gypsum method in Japan. [0003] China's power plant flue gas desulfurization technol...

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Problems solved by technology

[0005] 1. Exposure and solidification of desulfurization wastewater requires a large site and is limited by climatic conditions;

[0006] 2. The use of heaters to evaporate and solidify desulfurization wastewater has serious corrosion and scaling problems, requires expensive anti-corrosion materials, and is difficult to control;

[0007] 3. Heating, evaporation and curing require a large amount of electricity or other thermal energy;

[0009] 5. The above two processing methods are costly and time-consuming;

[0010] 6. Neither of the above two treatment methods can bring any help to the original limestone-gypsum wet flue gas desulfurization treatment process

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