Energy-saving and consumption-reducing method based on mine water zero-discharge whole process

Abstract

The invention relates to a mine water zero-discharge treatment method, in particular to an energy-saving and consumption-reducing method based on a mine water zero-discharge whole process, and belongsto the technical field of water treatment. In the energy-saving and consumption-reducing method based on a mine water zero-discharge full process, the mine water zero-discharge full process comprisesthe procedures of purification treatment of mine water, membrane concentration treatment and evaporative crystallization; the method is characterized in that mine water heat energy is recycled on thebasis of the mine water zero-discharge full process technology. According to different contents of temperature sensitive substances in the mine water, the process is divided into a direct-current type and a mixed-flow type. According to the method, the characteristics of low temperature and large specific heat capacity of the mine water are utilized according to different water temperatures and water qualities of the mine water and different water temperatures of cooling return water in the evaporative crystallization process, high-grade heat generated in the evaporative crystallization process is recycled by changing the flow of a mine water medium in zero-discharge treatment, and the low-temperature mine water is heated by utilizing the heat; therefore, the purposes of improving the sectional process efficiency in the whole zero-discharge process of the mine water, saving the energy consumption and the operation cost and the like are achieved.

Description

technical field [0001] The invention relates to a method for treating mine water with zero discharge, in particular to an energy-saving and consumption-reducing method based on the whole process of mine water zero discharge, and belongs to the technical field of water treatment. Background technique [0002] Most of the coal mines in my country are located in water-scarce and ecologically fragile areas such as North China and Northwest China, and more than 90% of the mine water in this area is high-salt mine water. Conventional treatment of high-salt mine water can no longer meet the discharge or reuse requirements, and zero-discharge treatment is required. Especially in recent years, the discharge of high-salt mine water in various mining areas has become higher and higher, and the pressure on coal enterprises in terms of resource constraints and discharge restrictions has risen sharply. Accelerating the implementation of energy saving and consumption reduction and zero dis...

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Problems solved by technology

[0008] The present invention aims at the defects of lack of cooling water source in the mining area, high energy consumption and operation and maintenance cost, low system production efficiency, serious waste heat waste of steam condensation and cooling heat exchange in the prior art in the zero discharge treatment of high-salt mine water pollutants, and provides a Based on the method of energy saving and consumption reduction in the whole process of mine water zero discharge, this method transfers the heat that needs to be cooled by evaporation and crystallization to the purified mine during the whole process design process according to the characteristics of mine water quality, cooling power of evaporation and crystallization process and return water temperature In water, it is used to increase the temperature of mine water, without external supply of circulating cooling water

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