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Method for concentrating high-salinity wastewater at low temperature

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

Active Publication Date: 2014-05-28
NANTONG STAR GRAPHITE EQUIP CO LTD
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  • Summary
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] 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

[0025] (1) Feed: Pass high-salt wastewater with a temperature of 25°C and an initial salt concentration of 14% into the first-effect heat exchanger for preheating, and set the temperature of the first-effect heat exchanger to 70°C;

[0026] (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;

[0027] (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 72°C;

[0028] (4) Second-effect evaporation: Pass the high-salt wastewater heated by the second effect into the sec...

Embodiment 2

[0032] The high-salt wastewater with a salt concentration of 20% was concentrated at low temperature according to the treatment method described in the example, and the purity of the obtained salt crystals was 99.7%.

Embodiment 3

[0034] The high-salt wastewater with a salt concentration of 30% was concentrated at low temperature according to the treatment method described in the example, and the purity of the obtained salt crystals was 99.8%.

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Abstract

The invention discloses a method for concentrating a high-salinity wastewater at low temperature. The method is characterized by comprising the following steps: feeding, single-effect evaporation, two-effect heat exchange, two-effect evaporation and separation. Especially, a steam machine recompression evaporator is adopted to carry out low-temperature evaporation concentration in the single-effect evaporation step, and the concentration effect is good. By adopting the method for concentrating the high-salinity wastewater at low temperature, the evaporation temperature of the high-salinity wastewater is reduced, energy is saved, the environment is protected, energy consumption for evaporating 1t of water is about 1 / 8 to 1 / 7 of that of the traditional evaporator, the method completely gets rid of dependence on a steam boiler, the MVR mainly consumes electric energy after consuming steam, an energy source is saved, the cost is reduced, the automatic degree is high, the work flow is full-automatic, and method is free of manual control.

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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IPC IPC(8): C02F9/10C02F1/04
Inventor 钱园姚培军
Owner NANTONG STAR GRAPHITE EQUIP CO LTD
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