Low-temperature liquid evaporator

Abstract

The invention relates to the field of liquid evaporation and concentration, especially to a low-temperature liquid evaporator. The low-temperature liquid evaporator comprises a water storage unit, a heat transfer unit and an evaporation unit which are connected through pipelines. The heat transfer unit at least heats a liquid by 3 DEG C. The evaporation unit comprises an evaporator and a drawing fan. The evaporator has an air inlet. The drawing fan can form a micro-negative pressure environment inside the evaporator. After the liquid flows through the heat transfer unit from the water storage unit, the liquid reaches the micro-negative pressure environment of the evaporation unit to be evaporated and become a concentrated liquid, and the concentrated liquid flows back to the water storage unit. By circulating and repeated concentration, crystals are precipitated out. According to the low-temperature liquid evaporator, by using difference between partial pressure of water vapor and partial pressure of saturated vapor as evaporation driving force, the evaporation process can meet the evaporation requirement only by heating by 3 DEG C under the micro-negative pressure condition, and low-temperature evaporation of the liquid is realized. Thus, evaporation condition and cost are greatly reduced, zero-discharge treatment of high-salinity wastewater such as high-sulfur wastewater, electroplating wastewater, etc. is achieved, and the ecological environment is protected.

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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