sewage treatment system

Abstract

The invention discloses a sewage treatment system. The sewage treatment system comprises a stock solution container, a horizontal pipe falling film evaporation device, a forced circulation evaporationdevice, a solid-liquid separation device, a heat exchanger and a condenser; the stock solution container is used for containing a sewage stock solution; the horizontal pipe falling film evaporation device communicates with the stock solution container and is used for evaporating and concentrating the sewage stock solution to obtain a first concentrated solution, first distilled water and non-condensable gas; the forced circulation evaporation device communicates with the horizontal pipe falling film evaporation device and is used for receiving the first concentrated solution and carrying outheating flash evaporation on the first concentrated solution; the solid-liquid separation device communicates with the forced circulation evaporation device and is used for receiving a second concentrated solution and carrying out crystallization and solid-liquid separation on the second concentrated solution so as to generate solid and first mother solution, wherein the first mother solution is introduced into the forced circulation evaporation device for carrying out heating flash evaporation and crystallization; the heat exchanger communicates with the stock solution container, the horizontal pipe falling film evaporation device and / or the forced circulation evaporation device; and the condenser communicates with the horizontal pipe falling film evaporation device, the forced circulation evaporation device, the stock solution container and / or the heat exchanger. The sewage treatment system provided by the invention has high heat exchange efficiency and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system. Background technique [0002] The feature of the horizontal tube falling film evaporator is that the material is evenly sprayed on the outer wall of the heat exchange tube to form a water film, which completely eliminates the influence of the static pressure head, and has high heat exchange efficiency and low energy consumption. However, due to the low flow rate and easy fouling, it is not suitable for evaporating waste water with high concentration. The feature of the forced circulation evaporator is that the material goes through the heat exchange between the steam inside the tube and the outside of the tube. The material flow rate is high and it is not easy to scale. It is suitable for processing materials that need to crystallize and produce salt, but the energy consumption is high. Contents of the invention [0003] Based on this, it is...

AI Technical Summary

Problems solved by technology

However, due to the low flow rate and easy fouling, it is not suitable for wastewater with high evaporation concentration.

The characteristic of the forced circulation evaporator is that the material flows through the steam inside the tube and outside the tube to exchange heat, the material flow rate is high and it is not easy to scale, it is suitable for processing materials that need to be crystallized to produce salt, but the energy consumption is high

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