Heat pump vacuum low-temperature evaporation concentration system

Abstract

The invention discloses a heat pump vacuum low-temperature evaporation concentration system. The system comprises an evaporation tank, a heating Carnot cycle system, a negative-pressure suction pipeline and a clean water circulation system; the upper part of the evaporation tank is connected with a wastewater inflow pipe and a steam discharge pipe; a wastewater heating system is arranged between the bottom of the evaporation tank and the wastewater inflow pipe; the clean water circulation system comprises a water tank, a water pump, a venturi and a heat dissipation and cooling device which aresequentially connected through a pipeline; one end of the negative-pressure suction pipeline is connected with the steam discharge pipe, the other end of the negative-pressure suction pipeline is connected with the introduction pipe of the venturi; a stop valve is arranged on the negative-pressure suction pipeline; the heat release side inlet of an evaporator in the heating Carnot cycle system isconnected with the water outlet end pipeline of the venturi, and the heat release side outlet of the evaporator is connected to the water tank. The heat pump vacuum low-temperature evaporation concentration system provided by the invention has the advantages of low-temperature stable operation, high evaporation concentration efficiency, low maintenance cost and long service life, realizes removalof water vapor, condensed water and non-condensable gas, and improves the evaporation and concentration efficiency of the evaporation tank.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, feed liquid concentration and leachate treatment, and particularly relates to a heat pump vacuum low-temperature evaporation concentration system. Background technique [0002] The outsourced treatment of high-concentration industrial wastewater is expensive. Traditional treatment methods, such as membrane concentration technology, ultra-high frequency vibration concentration technology, and disk tube reverse osmosis technology, cannot be further concentrated because the solute concentration is too high; another example is three-effect evaporation. Concentrator or MVR concentration equipment, the evaporation temperature is more than 90 to 100 degrees, the generation of scale is fast, the maintenance cost is high, and the service life of the equipment is short. [0003] The patent application number 201820113622.9 discloses a heat pump vacuum low-temperature evaporation and con...

AI Technical Summary

Problems solved by technology

[0002]The outsourced treatment of high-concentration industrial wastewater is expensive, and traditional treatment methods, such as membrane concentration technology, ultra-high frequency vibration concentration technology, disc tube reverse osmosis technology, etc. , because the concentration of the solute is too high and cannot be further concentrated; another example is the three-effect evaporator or MVR concentration equipment, the evaporation temperature is more than 90 to 100 degrees, the speed of scale generation is fast, the maintenance cost is high, and the service life of the equipment is short

[0003]A patent with application number 201820113622.9 discloses a heat pump vacuum low-temperature evaporation and concentration system, which has the following deficiencies: 1. For the heating Carnot cycle system, Most of the mechanical energy input to the compressor of the heating Carnot cycle system to do work is converted into heat energy input. The water vapor formed by the evaporation of waste water after absorbing heat is sucked into the distilled water cycle system by Venturi suction to form a vacuum, causing the temperature of the distilled water to rise. In order to avoid Ascent, the heated distilled water is exchanged with the refrigerator in the barrel to achieve the purpose of cooling, which returns most of the heat to the Carnot cycle system

If effective heat dissipation measures cannot be taken, the working temperature of the entire heat absorption-evaporative concentration-condensation system will continue to rise until the temperature rises to the point where the heat dissipation loss of the entire Carnot cycle system is equal to the electric power input by the compressor, which will lead to The system cannot work in a low temperature environment; 2. The system scheme does not disclose how to reduce the flow of distilled water condensed on the wall back to waste water or feed liquid

Images