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Process utilizing natural heat energy and cooling energy for evaporating bitter salt water

A brackish water, hot and cold technology, applied in general water supply conservation, heating water/sewage treatment, water/sewage treatment, etc., can solve the problem of low added value of fresh water and inorganic salts, large consumption of electricity or raw coal energy, and application limitations. It can promote the management of large areas of local saline-alkali land, solve the extreme scarcity of fresh water, and have strong adaptability of raw materials.

Inactive Publication Date: 2017-03-22
CHINA LIGHT IND INT ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The known desalination of brackish water containing inorganic salts and other components and the concentration of by-product concentrated brine usually use reverse osmosis, electrodialysis, mechanical compression or multi-effect evaporation processes. However, the above methods must consume a large amount of electric energy or raw coal energy. Due to High cost, low added value of product fresh water and inorganic salt, therefore, the application of the above method is limited and affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: take 1000m 3 The by-product of desalination of brackish water is concentrated brine (containing NaCl 125.0g / l, MgSO 4 35.0g / l) as the raw material, the raw material is preheated using sunlight in the southern Xinjiang region as a heat source, the preheating temperature is 25°C, and the hydrophobic film is used for evaporation, and the evaporation temperature is 25°C; the water vapor obtained by the evaporation of the hydrophobic film is used in winter The low-temperature brackish water is cooled and condensed, and the cooling temperature is 10°C; separated to obtain 500m 3 Concentrated saturated liquid (containing NaCl 250g / l, MgSO 4 70g / l) and 500m 3 For fresh water products, the concentrated saturated liquid goes to the evaporation process for salt production.

Embodiment 2

[0017] Embodiment 2: take 1000m 3 Brackish water (containing NaCl 0.5g / l, MgSO 4 0.15g / l, K 2 SO 4 0.025g / l, Na 2 SO 4 0.5g / l, CaCl 2 0.15g / l, MgCl 2 0.10g / l) as the raw material, the raw material is preheated by light-to-heat conversion heat or sunlight as the heat source, the preheating temperature is 25°C, and the hydrophobic film is used for evaporation, and the evaporation temperature is 25°C; the water vapor obtained by the hydrophobic film evaporation is used In winter, low-temperature brackish water is cooled and condensed, and the cooling temperature is 10°C; separated to obtain 4m 3 (Containing NaCl125g / l, MgSO 4 37.5g / l, K 2 SO 4 6.25g / l, Na 2 SO 4 125g / l, CaCl 2 37.5g / l, MgCl 2 25g / l) and 996m 3 For fresh water products, the concentrated saturated liquid goes to the evaporation process for salt production.

Embodiment 3

[0018] Embodiment 3: take 1000m 3 The by-product of desalination of brackish water is concentrated brine (containing NaCl 155.0g / l, MgSO 4 5.0g / l) as the raw material, the raw material is preheated using light-to-heat conversion heat as a heat source, the preheating temperature is 40°C, and the hydrophobic film is used for evaporation, and the evaporation temperature is 30°C; the water vapor obtained by the hydrophobic film evaporation is used at low temperature in winter The concentrated brine is cooled and condensed, and the cooling temperature is -5°C; separated to obtain 500m 3 Concentrated saturated liquid (containing NaCl 310g / l, MgSO 4 10.0g / l) and 500m 3 For fresh water products, the concentrated saturated liquid goes to the evaporation process for salt production.

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Abstract

Provided is a process utilizing natural heat energy and cooling energy for evaporating bitter salt water. The bitter salt water or a desalted byproduct of the bitter salt water, namely strong brine, is taken as a raw material, preheating is carried out with heat generated by photothermal conversion or with sunshine as a heating source, and the preheating temperature is 25-100 DEG C; a hydrophobic membrane is used for evaporation, the evaporation temperature is 20-90 DEG C, obtained water vapor is cooled and condensed with normal-temperature underground bitter salt water or low-temperature bitter salt water in winter or concentrated liquor of the bitter salt water, and the cooling temperature is 15-80 DEG C; and concentrated saturated liquid and a fresh water product are obtained through separation, and the concentrated saturated liquid is delivered to the evaporation salt-making procedure. According to the process, the flow is reasonable, the economical, reasonable and environment-friendly energy is utilized, the product structure is reasonable, adaptability of the raw material is high, cost is low, energy consumption is low, and emission of three wastes is avoided; and through the characteristics of bitter salt water containing a large amount of inorganic salt and the like, rich sunlight heat energy, quite high temperature in summer, long winter and low temperature in winter in the Xinjiang region, comprehensive utilization of development of bitter salt water is achieved, treatment of the large area of saline and alkaline land in the local region is promoted, and the tough situation of extreme lack of fresh water is avoided.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, in particular to a process for evaporating brackish water by using natural heat and cold energy. Background technique [0002] The known desalination of brackish water containing inorganic salts and other components and the concentration of by-product concentrated brine usually use reverse osmosis, electrodialysis, mechanical compression or multi-effect evaporation processes. However, the above methods must consume a large amount of electric energy or raw coal energy. Due to The cost is high, and the added value of the product fresh water and inorganic salts is low. Therefore, the application of the above method is limited and affected. In southern Xinjiang, there is a large amount of brackish water containing inorganic salts and other components. The summer is hot and the temperature is high, and the winter is long and low. The area of ​​saline-alkali land to be treated is la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/14
CPCC02F1/04C02F1/14Y02A20/124Y02A20/142Y02A20/212
Inventor 彭赛军刘绍山朱晓峰柴朝晖侯涛杨骅李燕
Owner CHINA LIGHT IND INT ENG CO LTD