Desulfurization wastewater resource treatment system

Abstract

The invention discloses a desulfurization wastewater resource treatment system. Steam passages and concentrated wastewater passages of adjacent two-stage evaporation units are sequentially connected.The shell pass of a condenser is arranged on an evaporation discharge passage of a last-stage evaporation unit to recover steam condensate. The tube pass of the condenser is communicated to a cold source to output hot water to recover heat. A heat preservation settler is communicated to a concentrated wastewater outlet passage of a first-stage evaporation unit, and the bottom is provided with a gypsum recovery port. The tube pass of a dead steam preheater is communicated to a wastewater inflow passage of the first-stage evaporation unit, and the shell pass is communicated to a steam passage between the final-stage evaporation unit and the condenser. The system can be directly used for conducting concentration and recovery treatment of the desulfurization wastewater, which greatly saves thetreatment cost generated by the system operation and provides a reliable guarantee for improving the resource utilization of the desulfurization wastewater on the basis of meeting the environmental emission requirements. The system has good economy.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a desulfurization waste water resource treatment system. Background technique [0002] With the increasingly prominent contradiction between economic and social development and resource and environmental constraints, environmental protection is facing more and more severe challenges. As we all know, dust and harmful gases generated by fuel combustion in industrial kilns, thermal power, cement, steel and other industrial production processes are discharged into the atmosphere, which is one of the main factors causing air pollution. Therefore, the purification of harmful pollutants in the industrial production process is the main measure to prevent and control air pollution and improve environmental quality. For example, the wet desulfurization device is an important environmental protection equipment widely used, and among them, the zero discharge of desulfurization...

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Problems solved by technology

[0003] In the existing technology, the mainstream route of zero discharge of desulfurization wastewater is "pretreatment (softening) + concentration reduction + evaporation crystallization / flue gas waste heat evaporation", the total operating cost of this process is as high as 100-120 yuan / ton, and the cost of wastewater treatment is huge , the cost of wastewater softening accounts for 60% to 80% of the total operating cost, especially, the softening pretreatment will cause a large amount of sludge

[0004] In addition, there is a typical concentration reduction method using thermal concentration technology. Due to the limitation of its own mechanism, the final product is a mixture of gypsum and a large amount of crystallized salt. The mixed crystallized salt directly affects the quality of gypsum and cannot achieve effective resource utilization. utilization

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