System and method for comprehensive treatment of salt-containing wastewater

Abstract

The invention discloses a comprehensive treatment system for salt-containing wastewater. The system comprises a material feeding pump, a preheater which is connected with the material feeding pump, anevaporator, a flash tank, a dryer, a falling pipe, a crystal salt collecting pool which is arranged below the dryer, a steam compressor and a circulating pump, wherein an inlet pipe at the cold sideof the preheater communicates with a normal temperature raw material liquid through the material feeding pump, an inlet at the hot side of the preheater communicates with a hot side outlet of the evaporator, and an inlet pipe at the cold side of the evaporator communicates with an outlet pipe at the cold side of the preheater and the outlet pipe of the circulating pump separately; an inlet pipe atthe hot side of the evaporator communicates with the outlet of the dryer, the material liquid inlet pipe of the flash tank communicates with the outlet at the cold side of the evaporator, and the material liquid outlet pipe of the flash tank communicates with the inlet of the circulating pump; and the saturated steam outlet of the flash tank communicates with the steam compressor, the outlet of the steam compressor communicates with the inlet pipe of the dryer, and the dryer communicates with an outlet pipe at the bottom of the flash tank through the falling pipe. Through the system, a solution carried by crystal salt particles can be removed, the phase change heat transfer effect is enhanced, the heat utilization rate is high, the recovery efficiency of crystal salt is high, and the quality of the crystal salt is high.

Description

technical field [0001] The invention relates to the technical field of an MVR evaporation and crystallization system for the treatment of salty waste water, in particular to a salty waste water comprehensive treatment system and a treatment method thereof that simultaneously realize evaporation concentration and crystalline salt drying. Background technique [0002] In the process of resource utilization of wastewater generated in the fields of food, chemical industry and pharmacy, the MVR evaporation crystallization method is widely used at present. This method has the advantages of large processing capacity, high efficiency, low evaporation temperature, and small heat exchange temperature difference. In the economical aspect of recovering crystalline salt, there are disadvantages such as high water content, poor whiteness, and high recycling cost. At the same time, tap water is used to eliminate steam superheat, resulting in low heat utilization rate. SUMMARY OF THE INVEN...

AI Technical Summary

Problems solved by technology

[0002] In the process of resource utilization of waste water produced in food, chemical and pharmaceutical fields, the MVR evaporation crystallization method is widely used at present. This method has the advantages of large processing capacity, high efficiency, low evaporation temperature, and small heat transfer temperature difference. However, In terms of the economy of recovering crystallized salt, there are disadvantages such as high water content, poor whiteness, and high reuse cost. At the same time, tap water is used to eliminate steam superheat, and the heat utilization rate is low.

Images