Improved heat pump vacuum low-temperature evaporation and concentration system

Abstract

The invention discloses an improved heat pump vacuum low-temperature evaporation and concentration system. The system comprises an evaporation tank, a heating Carnot cycle system and a non-condensablegas-containing mixed gas and condensed water removal system; the upper part of the evaporation tank is connected with a wastewater inflow pipeline and a steam discharge pipeline; a wastewater heatingsystem is arranged between the bottom of the evaporation tank and the wastewater inflow pipeline; a condenser in the heating Carnot cycle system is a heating part in the wastewater heating system; the steam discharge pipeline is connected with the top of an evaporator in the heating Carnot cycle system; the non-condensable gas-containing mixed gas and condensed water removal system comprises a water tank, a water pump, a venturi and a negative-pressure suction pipeline, wherein the water tank, the water pump and the venturi are sequentially connected in a closed-loop mode through pipelines; one end of the negative-pressure suction pipeline is connected with the bottom of the evaporator, and the other end of the negative-pressure suction pipeline is connected with the leading-in pipe of the venturi. The system of the invention has the advantages of low maintenance cost and long service life. The removal of condensed water and non-condensable gas is realized by arranging the non-condensable gas-containing mixed gas and condensed water removal system, so that evaporation and concentration efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical fields of industrial sewage treatment, industrial feed liquid concentration treatment and leachate concentration treatment, and particularly relates to an improved 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 201810062520.3 discloses a heat p...

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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 201810062520.3 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 heating system compressor to do work is converted into thermal energy input. If effective heat dissipation measures cannot be taken, the temperature of the entire heat absorption-evaporative concentration-condensation system will rise sharply, resulting in the system not being able to work in a low temperature environment; 2. The water vapor formed by the evaporation of waste water is sucked into the distilled water circulation system by Venturi suction to form a vacuum, which causes the temperature of the distilled water to rise. In order to avoid the rise, the heated distilled water is exchanged with the refrigerator in the middle cylinder to achieve the purpose of cooling. The heat is introduced into the system again, and the circulating work causes the temperature of the system to rise sharply, which makes the system unable to work at low temperature; 3. When the system is started, the non-condensable gas dissolved in the wastewater is released into the gas phase space of the vacuum system due to the high vacuum. The mixed gas of condensed gas does not explain how to remove it efficiently, energy-saving and economically

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