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Energy-saving pressure-reduction distillation device and method

A decompression membrane distillation, membrane distillation technology, applied in the direction of pervaporation, etc., can solve the problem of unsuitable cost and so on

Active Publication Date: 2009-04-29
海之凰(南通)环境科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of these technologies are suitable for treating low-concentration saline solutions, but are not suitable or cost-prohibitive for water treatment with high concentrations of acid-base salts on different scales

Method used

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  • Energy-saving pressure-reduction distillation device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Material aqueous solution: sea water

[0041] Pretreatment: sedimentation, sand filtration, microfiltration

[0042] Membrane and membrane module: polypropylene hollow fiber membrane, plate and frame cross-flow membrane module structure

[0043] Heat recovery device: shell and tube titanium heat exchanger, steam jet heat pump

[0044] Heating: The heat source is the exhaust steam of the thermal power plant, and the inlet temperature of the membrane module of the material liquid is 90°C

[0045] Results: The product is distilled water, 12% saline concentrated seawater, and the heat recovery rate is 85%.

Embodiment 2

[0047] Material aqueous solution: dilute sulfuric acid, hydrochloric acid industrial wastewater

[0048] Pretreatment: microfiltration

[0049] Membrane and membrane module: polytetrafluoroethylene hollow fiber membrane, shell and tube membrane module structure

[0050] Heat recovery device: plastic material heat exchanger, steam jet heat pump

[0051] Heating: low-pressure steam, the inlet temperature of the membrane module of the material liquid is 85°C

[0052] Results: The products are distilled water and high-concentration acid-containing aqueous solution, and the heat recovery rate is 80%.

Embodiment 3

[0054] Material aqueous solution: 8% ethanol aqueous solution

[0055] Pretreatment: microfiltration

[0056] Membrane and membrane module: polyvinylidene fluoride flat membrane, roll type laminar flow module structure

[0057] Heat recovery device: copper plate heat exchanger

[0058] Heating: cooling tower heat exchange, the inlet temperature of the membrane module of the material liquid is 65°C

[0059] Results: The product is a 95% ethanol solution, and the heat recovery rate is 50%.

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Abstract

The invention relates to a vacuum membrane distillation (VMD) device and a method used for carrying out heat recovery effectively, comprising a membrane distillation system, a heat recovery system, a heating equipment, a vacuum equipment, a liquid circulation system, a pre-disposal system, system control and detection. The vacuum membrane distillation (VMD) device and the method can utilize low-temperature heat source, and have high heat utilization ratio, high desalinization ratio and wide application range.

Description

technical field [0001] The invention relates to a vacuum membrane distillation (VMD) device and method capable of effectively recovering heat. Background technique [0002] The shortage of fresh water resources and the pollution of the water environment are the serious problems we face. Desalting clean water from the vast ocean, rich brackish water or industrial wastewater is an effective way to solve the shortage of fresh water and open up new sources of fresh water. way. [0003] At present, two series of thermal methods (MSF, MED) and membrane methods (RO) have been basically formed in terms of large-scale desalination equipment and technology. In terms of small and medium-sized desalination equipment, various technical types have been formed, mainly including: chemical (precipitation) method, ion exchange adsorption method, membrane method, electrodeionization method, distillation method and biological method. Most of these technologies are suitable for treating low-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36
Inventor 侯爱平董为毅
Owner 海之凰(南通)环境科技发展有限公司
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