Low-temperature liquid evaporator

Abstract

The invention relates to the field of liquid evaporation and concentration, in particular to a low-temperature liquid evaporator. It includes a water storage unit connected by pipes, a heat exchange unit and an evaporation unit. The heat exchange unit heats the liquid at least 3 degrees Celsius. The evaporation unit includes an evaporator and an exhaust fan. The evaporator has an air inlet. pressure environment; the liquid flows from the water storage unit through the heat exchange unit to be heated, then reaches the evaporation unit for evaporation in the micro-negative pressure environment, becomes concentrated liquid and flows back to the water storage unit, and repeats the cycle until the crystals are precipitated. The low-temperature liquid evaporation device of the present invention uses the difference between the partial pressure of water vapor and the partial pressure of saturated water vapor as the driving force for evaporation, so that the evaporation process only needs to be heated by 3 degrees Celsius under the condition of slight negative pressure to meet the evaporation requirements and realize liquid Evaporating at low temperature greatly reduces the conditions and costs of evaporation, realizes zero discharge treatment of high-salt wastewater such as high-sulfur wastewater and electroplating wastewater, and protects the ecological environment.

Description

technical field [0001] The invention relates to the field of liquid evaporation and concentration, in particular to a low-temperature liquid evaporator. Background technique [0002] High-salt wastewater refers to wastewater with a salt content of at least 1%, which mainly comes from the steel industry, chemical industry, power industry, and oil and gas collection and processing, such as desulfurization wastewater from thermal power plants, anti-fingerprint waste liquid from steel plants, and electroplating in electroplating plants. Wastewater, this kind of wastewater contains a variety of substances, including salt, oil, organic heavy metals and radioactive substances. If it is discharged into rivers, lakes and seas, it will seriously affect the water quality and soil, and cause poisonous and inhibitory effects on the growth of animals and plants in the water. [0003] Salt wastewater is produced in a wide range of ways, and the amount of water is increasing year by year. ...

AI Technical Summary

Problems solved by technology

Among them, the concentrated evaporation treatment method has the advantages of large processing capacity and low requirements on water quality, and is currently the mainstream treatment method; but because the traditional evaporation method needs to heat the liquid to at least 80 degrees to start the evaporation process, it requires a lot of heat energy, and the evaporator The use of a furnace has many defects such as inaccurate control of the temperature in the furnace and loss of heat transfer, and the operating cost is very expensive; not only that, high-temperature evaporation will cause toxic and harmful organic substances to volatilize into the air, causing gas pollution

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