Method and system for processing desulphurization waste water

Abstract

The invention discloses a method and a system for treating desulfurization wastewater, which are applicable to treating the wastewater generated from limestone-plaster wet flue gas desulfurization and other wastewater with high salt content. The system comprises a spray drier, a flue gas transport pipeline, a dust catcher, a smoke exhaust fan, a waste ash outlet and the like. The method comprises the steps: in the spray drier, hot flue gas and the desulfurization wastewater exchange heat through convection contact, so as to change the wastewater to particles and wet flue gas, discharge the settled particles and remove the wet flue gas and the suspended particles through the dust catcher. 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 after 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 tech...

AI Technical Summary

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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