Combined evaporation device and evaporation control method

Abstract

The invention provides a combined evaporation device and an evaporation control method. The combined evaporation device comprises a primary evaporator, a final-stage evaporator and a slag-water separator, wherein the primary evaporator is provided with a first feeding port, a first discharging port and a first exhaust port; the final-stage evaporator is provided with a second feeding port, a second discharging port and a second exhaust port; the second feeding port is connected with the first discharging port, so that a primary concentrated solution subjected to primary evaporation of the primary evaporator is conveyed to the final-stage evaporator; the slag-water separator is provided with a third feeding port, a third discharging port and a backflow port; the third feeding port is connected with the second discharging port of the final-stage evaporator; the slag-water separator is used for carrying out solid-liquid separation on a final-stage concentrated solution; and the backflow port is connected with the final-stage evaporator. According to the combined evaporation device and the evaporation control method, liquid-slag separated liquid supernatant is back flowed and conveyedin the final-stage evaporator, so that the concentration of suspended solids in the final-stage evaporator is reduced, smooth deslagging is achieved easily, and the continuous and stable operation ofthe final-stage evaporator is guaranteed.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment for environmental protection, in particular to a combined evaporation device and an evaporation control method for high-salt wastewater. Background technique [0002] With the increasingly stringent environmental protection laws and regulations in my country and the gradual improvement of discharge standards, more and more industries or regions require zero discharge of wastewater, so more and more high-salt wastewater is produced in the process of sewage and wastewater treatment, such as garbage Membrane concentrate of leachate, hazardous waste treatment residual high brine, etc. Usually, high-salt wastewater contains high concentrations of organic pollutants, heavy metals, and calcium and magnesium ions that are easy to scale, so it is difficult to treat. [0003] Evaporation is a common technology for high-salt wastewater treatment. Mechanical vapor compression evaporation and mult...

AI Technical Summary

Problems solved by technology

[0005] (1) During the operation of the submerged combustion evaporator, the slag is produced quickly and the amount of slag is large. If the slag is not discharged in time, it will lead to the accumulation of sediment inside the evaporator, which will cause the system to block and cannot continue to operate, affecting the production efficiency of the evaporator.

[0006] (2) Due to the high concentration of materials in the submerged combustion evaporator, volatile pollutants are easily formed under local high temperature conditions of direct contact with heat transfer evaporation, which in turn leads to serious tail gas odor problems

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