Method for efficiently evaporating bittern and recovering fresh water

Abstract

The invention relates to a method for efficiently evaporating bittern and recovering fresh water. The method is especially suitable for high-efficiency evaporation of bittern for high-salinity salt pan or potash fertilizer production and recovery of fresh water. According to the method, transparent plastic foil is used to make a large-scale hyperboloid tower. The tower top forms a three-way connection with a horizontal condenser tube, which is slightly inclined downwards, through a vertical transparent plastic tube. The condenser tube collects fresh water and discharges the fresh water upward out from a far-end opening. There is enough gap between the tower bottom and a bittern pond so as to guarantee the air inflow velocity is less than the emptying velocity. The bittern passes through a center tube under the tower and is ejected sideways and downwards. It is not appropriate to splash the bittern on the plastic foil. In order to fully utilize the characteristic of large day-and-night temperature difference in the west of our country and raise the condensation efficiency, deposited crystals are removed out before the temperature is raised in the morning. According to the method, solar energy is fully utilized to heat the bittern, and the advantage of fast upper air-flow velocity is also utilized to raise the air flow velocity on the surface of the bittern so as to improve the evaporation speed. The fresh water is recovered by a condensation recovery device. The invention is beneficial to the salt pan production.

Description

technical field [0001] The invention relates to a method for improving the evaporation efficiency of salt lake brine, especially a method for further high-efficiency evaporation from high-salt brine and concentrated old brine in salt fields, which can recover fresh water and precipitate and separate crystalline chloride. technical background [0002] Salt lakes in western my country generally use the salt field method to produce potassium fertilizer, and the old brine of potash fertilizer is further concentrated by the salt field method to concentrate crystalline magnesium chloride. The salt field method generally adopts the natural evaporation of sun-dried salt ponds, the evaporation efficiency is low, and a large amount of evaporated fresh water cannot be recovered. [0003] Sun-dried evaporation in salt fields can use solar energy, but due to the low surface wind speed and the low air velocity on the liquid surface in salt fields, it cannot effectively take away the vapor...

AI Technical Summary

Problems solved by technology

The salt field method generally adopts the natural evaporation of sun-dried salt ponds, the evaporation efficiency is low, and a large amount of evaporated fresh water cannot be recovered

[0003] Solar evaporation in salt fields can use solar energy, but due to the low wind speed on the surface and the low air velocity on the liquid surface in salt fields, it cannot effectively take away the vaporized water vapor, which reduces the evaporation efficiency

Water vapor drifts with the wind and cannot be collected and utilized