Application of evaporative crystallization technology in the zero-discharge field of coal chemical wastewater
Published Time:
2021-11-11
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In the production of coal chemical enterprises, the discharge of high-salt wastewater is relatively large. When treating high-salt wastewater from coal chemical industry, evaporation crystallization technology is generally used. Today, let's take a look Wastewater evaporation crystallization Technology application in the field of zero discharge of coal chemical wastewater.
The demand for water resources and pollutant discharge from coal chemical enterprises seriously affect the economic development of the region. In order to reduce pollutant discharge and protect the water environment, it is necessary to achieve zero discharge of wastewater and realize the recycling of water resources.
Overview of Evaporation Crystallization Technology
Evaporation crystallization technology is applied to the treatment of high-salt wastewater in the coal chemical industry. The high-salt wastewater from coal chemical industry mainly comes from coal gas washing wastewater, chemical water station drainage, circulating water system drainage, and other organic wastewater after biological treatment.
Common in zero discharge of coal chemical wastewater MVR evaporation crystallization The technology is generally multi-effect evaporation technology and mechanical vapor recompression technology.
Multi-effect evaporation technology connects evaporators. The steam generated by the evaporator in the previous effect is used as the heat source for heating the evaporator in the next effect, so that the thermal energy is efficiently utilized. The pretreatment of the influent of multi-effect evaporation technology is relatively simple, and it can separate the non-volatile solvents and solutes in the wastewater, and will not leave a large amount of concentrated liquid, which is easy to treat after pyrolysis.
Mechanical vapor recompression technology uses the secondary steam in the evaporator, compresses it with a compressor, increases the temperature and pressure, and keeps the liquid boiling. The heating steam itself condenses into water. Through this method, steam can be used efficiently, the latent heat is recovered, the thermal efficiency is improved, the resource demand and energy consumption are reduced, and pollution is reduced.
Comparison of multi-effect evaporation technology and mechanical vapor recompression
Compared with multi-effect evaporation technology, mechanical vapor recompression technology can fully utilize secondary steam and has obvious energy-saving effect. Multi-effect evaporation technology and mechanical vapor recompression technology each have their own advantages. Multi-effect evaporation technology is steam-determined electricity, while mechanical vapor recompression technology is electricity-determined steam. In order to achieve gas-electricity balance, the two can be organically combined.
When treating coal chemical wastewater, using high-salt wastewater evaporation crystallization technology can separate wastewater from salt. This treatment technology is a treatment process that can achieve zero wastewater discharge. The above is the application of wastewater evaporation crystallization technology in the field of zero discharge of coal chemical wastewater brought to you by the editor.
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