Method for preparing salt from brine in solar pond

Abstract

The invention discloses a method for preparing a salt from brine in a solar pond. The method comprises the following technical steps: establishing the solar pond, realizing the heat-absorption operation of the solar pond, extracting the hot brine and preparing the salt from the hot brine in a flash evaporation manner, namely sequentially injecting salina brine, desalted concentrated seawater and fresh water into a solar pond device at a ratio of 0.5:0.4:0.1; drying the solar pond injected with the water in the sun; extracting the hot brine from one side of the solar pond after the temperature at the bottom in the solar pond reaches more than 70 DEG C; crystallizing the extracted hot brine in a closed evaporator in the flash evaporation manner so as to obtain a salt product. The salina brine, the desalted concentrated seawater and the fresh water are taken as working media for the solar pond, so that the cost of raw materials is low. Thus, the energy consumption during salt preparation is greatly decreased and the precious land resource is saved. The brine preparing period is shortened by preparing the salt via the evaporator, so that the quality of the salt is greatly improved. Thus, the method for preparing the salt from the brine is environmental-friendly, low in cost, simple and convenient in operation and strong in practicability.

Description

technical field [0001] The invention belongs to the technical field of solar pond utilization, and relates to a method for producing salt from brine using solar ponds. Background technique [0002] Solar ponds are saline ponds with a certain salt concentration gradient and are considered to be one of the most promising means of collecting and storing solar energy. The operating principle of the solar pool is to use the middle non-tropospheric salt concentration to be in a stable state to inhibit convective heat loss, thereby isolating the absorbed solar radiation heat in the lower troposphere. The solar pond has the advantages of large heat capacity, long-term heat storage, and low cost. People have already carried out research on its power generation and heating. Guangxi University used solar ponds to heat some seafood and aquatic products that are difficult to survive the winter naturally. The results showed that the average survival rate of aquatic products in winter rea...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problems in the existing technology of beach sun-dried salt production, the present invention proposes a brine salt production method using solar ponds, the purpose of which is to establish a solar pond using salt field brine and concentrated seawater as working fluids, and use the solar pond to store Thermal characteristics, heating the saturated brine in the troposphere, then taking it out and dehydrating and crystallizing salt in a flashing way, in order to overcome the defect that the evaporation of high-concentration seawater is greatly reduced under the condition of high humidity in summer, and the solar pool and the flat sun pool Combined to improve solar energy utilization and salt production efficiency, reduce salt production costs