A method of energy saving and consumption reduction based on the whole process of mine water zero discharge

Abstract

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. An energy-saving and consumption-reducing method based on the whole process of mine water zero discharge. The whole process of mine water zero discharge includes mine water purification treatment, membrane concentration treatment and evaporation crystallization process. The method is based on the mine water zero discharge process. According to the content of temperature-sensitive substances in mine water, mine water heat energy reuse can be divided into straight-flow type and mixed-flow type. According to the difference between mine water temperature and water quality and cooling return water temperature in the evaporation and crystallization process, the method of the present invention utilizes the characteristics of low mine water temperature and large specific heat capacity, and recovers high-grade mine water produced in the evaporation and crystallization process by changing the process flow of the mine water medium in zero discharge treatment. The heat is used to increase the temperature of low-temperature mine water, so as to achieve the purpose of improving the efficiency of staged processes in the whole process of mine water zero discharge and saving energy and operating costs.

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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