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
  • Abstract
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  • Claims
  • Application Information

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 dir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] (1) Feeding: The high-salt wastewater with a temperature of 25°C and an initial salt concentration of 14% is fed into the first-effect heat exchanger for preheating, and the temperature of the first-effect heat exchanger is set 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℃, and the evaporation pressure to 0.5MPa; The salt concentration of the salt wastewater reaches 26%, and the two-effect heat exchange is performed;

[0027] (3) Two-effect heat exchange: pass the high-salt wastewater after the first-effect evaporation into the second-effect heat exchanger for heating, and set the temperature of the second-effect heat exchanger to 72℃;

[0028] (4) Two-effect evaporation: pass the high-salt wastewater heated by the two-effect into the two-effect crystal evaporator for evaporation and ...

Example Embodiment

[0031] Example 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 embodiment, and the resulting salt crystal purity was 99.7%.

Example Embodiment

[0033] Example 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 embodiment, 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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