Mechanical steam recompression continuous evaporative crystallization system and mechanical steam recompression continuous evaporative crystallization method

A mechanical steam, evaporation and crystallization technology, applied in evaporation, solution crystallization, separation methods, etc., can solve the problems of no significant advantages of the MVR system, increased complexity of the MVR system, poor crystallization effect, etc., and achieves a small footprint and no need for Steam boiler, the effect of compact equipment

Active Publication Date: 2013-04-03
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the poor crystallization effect of the existing mechanical vapor recompression continuous evaporation crystallization system, such as problems such as small crystal particle size
There are also some manufacturers who will add steam pipes to supplement the heat supply of the crystallization part, but this greatly increases the complexity of the MVR system and relies on steam boilers, making the MVR system lose its original significant advantage - get rid of the dependence on steam boilers

Method used

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  • Mechanical steam recompression continuous evaporative crystallization system and mechanical steam recompression continuous evaporative crystallization method

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Effect test

Embodiment 1

[0043] Such as figure 1 Shown, a kind of mechanical vapor recompression continuous evaporation crystallization system, described system comprises evaporator 1, separator 2, primary water vapor compressor 3, secondary water vapor compressor 4 and crystallizer 5; Said evaporator 1 is connected to the separator 2, and the separator 2 is connected to the primary steam compressor 3, and the primary steam compressor 3 is connected to the evaporator 1; the inlet of the crystallizer 5 is connected to the outlet of the evaporator 1, and the top of the crystallizer is connected to the secondary water The steam compressor 4 and the secondary steam compressor 4 are connected with the crystallizer 5 again.

[0044] The bottom of the separator 2 is connected to the feed pipe 9 of the evaporator 1; the feed pipe 9 is equipped with a tee, and its branch is connected to the discharge throttle valve 10 and then connected to the crystallizer 5 inlet.

[0045] The feed pipe 9 controls feed throu...

Embodiment 2

[0050] The mechanical vapor recompression continuous evaporation crystallization system of the present invention is used for the recovery of inorganic salts such as sodium chloride and sodium sulfate in papermaking wastewater, so that the wastewater can be discharged or reused up to the standard:

[0051] The papermaking wastewater enters the evaporator 1 to evaporate and then enters the separator 2 for vapor-liquid separation. Most of the separated secondary steam enters the first-stage water vapor compressor 3 to be compressed. The heat source heats the incoming wastewater, and the liquid in the lower part of the separator 2 re-enters the evaporator 1 to continue to evaporate; when the concentration of the wastewater reaches the saturated concentration of sodium chloride or sodium sulfate, open the discharge throttle valve 10 and enter the crystallizer 5 for crystallization;

[0052] Part of the secondary steam separated from the separator 2 passes through the bypass valve 7 ...

Embodiment 3

[0055] The mechanical vapor recompression continuous evaporation crystallization system of the present invention is used for seawater desalination:

[0056] The seawater enters the evaporator 1 to evaporate and then enters the separator 2 for vapor-liquid separation. Most of the separated secondary steam enters the first-stage water vapor compressor 3 to be compressed. After increasing the temperature and pressurization, the enthalpy is increased and enters the evaporator 1 as a heat source. Heating the incoming seawater, the liquid in the lower part of the separator 2 re-enters the evaporator 1 to continue evaporating; when the seawater reaches the saturation concentration, open the discharge throttle valve 10 and enter the crystallizer 5 for crystallization;

[0057] Part of the secondary steam separated from the separator 2 passes through the bypass valve 7 and merges with the secondary steam generated during the crystallization process, enters the secondary water vapor comp...

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Abstract

The invention relates to a mechanical steam recompression continuous evaporative crystallization system and a mechanical steam recompression continuous evaporative crystallization method. The system comprises an evaporation unit and a crystallization unit, wherein the evaporation unit and the crystallization unit are both provided with water steam compressors; material liquid enters the evaporation unit to be evaporated and subsequently is subjected to gas-liquid separation; the separated secondary steam enters a steam compressor to be compressed, and subsequently enters the crystallization unit to be used as heat source heating material liquid; the material liquid which is evaporated and compressed in an evaporator enters the crystallization unit to be crystallized; the secondary steam generated by crystallization enters the steam compressor to be compressed, subsequently enters the crystallization unit and is used as a heat source for heating the materials in the crystallization unit so as to crystallize the materials; and the crystallized materials are discharged. The system is compact in equipment, small in occupied area and small in desired space, and a cooling system can be omitted; and the secondary steam in the evaporation and crystallization process is sufficiently utilized, the latent heat is recycled, and the heat efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of evaporation crystallization, in particular to a mechanical vapor recompression continuous evaporation crystallization system and method. Background technique [0002] Evaporative distillation is widely used in many industries involving evaporation processes, such as sewage / wastewater treatment, chemical industry, pharmaceuticals, food, seawater desalination, and salt production. Evaporative distillation is an energy-intensive process, and the evaporation process is the largest energy consumer in these industries. The main production and consumption of these industries lies in the cost of energy consumption. [0003] At present, the existing domestic industries involved in the evaporation process generally adopt multi-effect evaporation technology for evaporation and concentration. The working process needs to maintain a large amount of raw steam, and it needs to be equipped with coal-fired boilers and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/00B01D1/30B01D9/02
CPCY02P70/34Y02P70/10
Inventor 张振涛戴群特杨鲁伟
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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