Energy-saving zero-emission low-temperature normal-pressure evaporation and crystallization system and working method thereof

Abstract

The invention discloses an energy-saving zero-emission low-temperature normal-pressure evaporation and crystallization system and a working method thereof, and belongs to the technical field of high-concentration brine zero emission. The system comprises an evaporation chamber, a crystallization kettle, an evaporation and condensation heat exchanger, a condensation chamber and a refrigeration chamber unit. Concentrated crystallization of strong brine and collection of condensate are achieved through circulation in the evaporation chamber and the condensation chamber according to the characteristic that the moisture carrying capacity of air at different temperatures is different, and high-concentration brine zero-discharge treatment at normal temperature and normal pressure is achieved. Thesystem is reasonable in design, high in automation degree, low in energy consumption, low in cost, zero in pollutant discharge, high in salinity and COD removal efficiency and remarkable in energy-saving effect, strong brine is treated into solid salt and clear water, and the system has good economic benefits, obvious environmental protection advantages and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of high-concentration brine zero discharge, and in particular relates to an energy-saving zero-discharge low-temperature atmospheric pressure evaporation crystallization system and a working method thereof. Background technique [0002] Fresh water is the material basis for human survival. With the development of industrial civilization, the problem of seawater desalination and high-concentration brine discharged from industrial production is becoming more and more serious. Evaporation and concentration of solutions is an important way to solve this problem. Traditional solution concentration methods include multi-stage flash evaporation, multi-effect evaporation, reverse osmosis and other methods. The process of multi-stage flash evaporation and multi-effect evaporation needs to consume a large amount of steam; the reverse osmosis method needs to consume high-quality electric energy, and the operation and m...

AI Technical Summary

Problems solved by technology

Multi-stage flash evaporation and multi-effect evaporation process consume a large amount of steam; reverse osmosis requires high-quality electric energy, and the operation and maintenance are complicated and costly

The traditional solution concentration method concentrates the solution salinity to more than 6% and then discharges it directly into the environment, ignoring the long-term impact of the high-salinity solution on the ecological environment of the surrounding sea area

It can be seen that the traditional solution concentration method has high energy consumption and high pollution. It is of great significance to develop a solution concentration process with low energy consumption, low cost and zero pollution discharge.

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