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Method for low-temperature concentration of high-salinity wastewater

A high-salt wastewater, low temperature concentration technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem that secondary steam cannot be directly used as an effective heat source, and achieve automation The effect of high degree, energy saving and lower evaporation temperature

Inactive Publication Date: 2015-10-21
秦健
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  • Summary
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AI Technical Summary

Problems solved by technology

In the multi-effect evaporation process, the secondary steam of the last effect of the evaporator cannot be directly used as an effective heat source, but can only be used as a heat source of the second effect or several effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Feeding: the high-salt wastewater with a temperature of 25°C and an initial salt concentration of 15% is passed into the first-effect heat exchanger for preheating, and the temperature of the first-effect heat exchanger is set to 70°C;

[0025] (2) One-effect evaporation: Pass the preheated high-salt wastewater into a one-effect steam mechanical recompression evaporator for evaporation and concentration, set the evaporation temperature to 100°C, and the evaporation pressure to 0.5MPa; the high-salt wastewater after the first-effect evaporation The salt concentration of salt wastewater reaches 26%, and the second-effect heat exchange is carried out;

[0026] (3) Second-effect heat exchange: pass the high-salt wastewater evaporated from the first effect into the second-effect heat exchanger for heating, and set the temperature of the second-effect heat exchanger to 73°C;

[0027] (4) Second-effect evaporation: Pass the high-salt wastewater heated by the second effect ...

Embodiment 2

[0031] The high-salt wastewater with a salt concentration of 20% was concentrated at low temperature according to the treatment method described in the examples, and the purity of the obtained salt crystals was 99.7%.

Embodiment 3

[0033] The high-salt wastewater with a salt concentration of 28% was concentrated at low temperature according to the treatment method described in the examples, and the purity of the obtained salt crystals was 99.8%.

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PUM

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Abstract

The invention discloses a method for low-temperature concentration of high-salinity wastewater. The method is characterized by comprising the steps of feeding, one-effect evaporation, two-effect heat exchange, two-effect evaporation and separation. Particularly, according to the step of one-effect evaporation, a steam machine recompression evaporator is adopted for low-temperature evaporation concentration, and the concentration effect is good. According to the method for low-temperature concentration of high-salinity wastewater, the evaporation temperature of the high-salinity wastewater is decreased, energy conservation and environmental protection are achieved, energy consumed for evaporating one ton of water is about one eighth to one seventh that consumed by a traditional evaporator, the dependency on a steam boiler is eliminated completely, electric energy is mainly consumed after MVR begins to consume steam, the energy is saved, the cost is lowered, the automation degree is high, the full-automatic working process is achieved, and no artificial monitoring is needed.

Description

technical field [0001] The invention relates to a method for concentrating high-salt wastewater, in particular to a method for concentrating high-salt wastewater at low temperature, and belongs to the field of energy-saving manufacturing. Background technique [0002] Mechanical vapor recompression evaporator is abbreviated as MVR evaporator in English, through countercurrent washing and mechanical recompression of waste heat steam generated in the evaporation process, to improve the cleanliness and enthalpy of waste heat steam, reuse, to achieve the purpose of energy saving and environmental protection . [0003] MVR low-temperature evaporator is currently the most advanced evaporator technology in the world, and its characteristics are as follows: [0004] 1) There is no waste heat steam discharge, and the energy saving effect is very significant, which is equivalent to a 10-effect evaporator. [0005] 2) Using this technology can realize the countercurrent washing of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 秦健
Owner 秦健
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