Membrane distillation sea water desalination method

A seawater desalination and membrane distillation technology, which is applied in the field of membrane distillation and applied equipment, can solve the problems of slow mass transfer speed, low mechanical strength of the film, and less steam volume.

Inactive Publication Date: 2004-07-21
郭兴中 +1
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  • Abstract
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Problems solved by technology

[0021] 4. The mechanical strength required for the film is low
[0025] 2. During the mass transfer process, temperature polarization may occur on the surface of the film (Temperature Polarization)
[0026] 3. During the mass transfer process, concentration polarization may also occur on the surface of the film (ConcentrationPolarization)
[0028] 5. Because the limited temperature difference is used for the permeation mass transfer of liquid-gas balance, the mass transfer rate is relatively slow, so it is necessary to maintain a large temperature difference between the two measured fluids of the membrane to make up for this p

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  • Membrane distillation sea water desalination method
  • Membrane distillation sea water desalination method
  • Membrane distillation sea water desalination method

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Embodiment Construction

[0041] refer to Figure 4 , 5 , a high-efficiency and low-cost membrane distillation seawater desalination method of the present invention comprises the following steps:

[0042] 1. Seawater supply: take a container 20 to hold seawater 1 of predetermined capacity.

[0043]2. Pressurized flotation, gas-water mixing: a pumping motor 30 is set on a pipeline to pump seawater into the container 20, and the other branch of the pipeline is provided with a gas supplier 40, which can A predetermined gas 4 is fed into the pipeline. In this embodiment, the gas 4 is ordinary air. Before mixing, the gas 4 is pre-pressurized and heated, and then mixed with seawater 1 to form a working liquid 5 with gas. , the purpose of heating is mainly to make the mixed working liquid 5 have a certain high temperature, which can accelerate the production of water vapor in the working liquid 5, and the energy required for heating the gas is far less than that for heating the liquid, which has the effect ...

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Abstract

A membrane distilling process for desalinating seawater includes filtering seawater, bubbling while pressure floating to rmeove seaweeds and solid impurities, bubbling again to mix air with water to become emulsion and making the bubbles contain saturated water vapour, delivering it into a desalinating equipment containing one or more porous hydrophobic membranes to penetrate the emulsion containing a lot of saturated water vapour through the membrane, and condensing the water vapour to obtain fresh water.

Description

(1) Technical field [0001] The present invention relates to a membrane distillation method and applied equipment, in particular to a high-efficiency and low-cost membrane distillation seawater that can improve the water production function of seawater desalination, and can improve the separation efficiency of membrane distillation seawater desalination and greatly reduce costs. Dilution method. (2) Background technology [0002] At present, the desalination water production technology used in seawater desalination for commercial purposes in the world can be mainly divided into two categories: distillation and membrane separation. Distillation methods also include: Multi-Stage Flash (Multi-Stage Flash or MSF), Multi-Effect Distillation (Multi-Effect Distillation or MED) and Vapor Compression (Vapor Compression or VC). Membrane separation methods mainly include reverse osmosis (Reverse Osmosis or RO) and electrodialysis (Electro Dialysis or ED). [0003] The desalination tec...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/44
CPCY02A20/124Y02A20/131Y02W10/37
Inventor 郭兴中张振章
Owner 郭兴中
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