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Flat plate type membrane module integrated with feed liquid heating function and application thereof in membrane distillation

A flat-plate membrane and integrated material technology, applied in the field of membrane separation, can solve the problems of reducing MD separation efficiency, transmission power loss, etc., and achieve the effects of reducing the impact of the boundary layer, improving energy efficiency, and enhancing performance

Inactive Publication Date: 2021-06-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the smaller size of the connecting pipe will cause a large power loss in the fluid pipeline transmission, a connecting pipe with an outer diameter greater than 4mm is usually used, so the distance from the heating surface to the membrane surface designed according to the existing scheme is generally not less than 4mm, resulting in the present situation. It is difficult to further reduce the distance between the heating surface and the membrane surface in the flow channel design scheme, resulting in serious polarization (that is, the temperature of the fluid on the membrane surface is lower than the average temperature in the flow channel on the feed liquid side of the membrane module), thereby reducing the MD separation efficiency

Method used

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  • Flat plate type membrane module integrated with feed liquid heating function and application thereof in membrane distillation
  • Flat plate type membrane module integrated with feed liquid heating function and application thereof in membrane distillation
  • Flat plate type membrane module integrated with feed liquid heating function and application thereof in membrane distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A DCMD system for concentration and desalination of brine is constructed by using the membrane module of this embodiment. Such as Figure 4 As shown, the membrane assembly including the integrated heating component adopting the U-shaped flow channel design scheme of the present invention, and as figure 2 The process of the feed liquid side and the process of the permeate side are the same as those of the comparative example.

[0050] The membrane module with integrated heating components adopts U-shaped flow channel design, and through the inlet and outlet channels set perpendicular to the membrane surface, a sufficiently small distance between the heating plate and the membrane surface can be obtained, so that the liquid on the surface of the microporous hydrophobic membrane 12 can be heated The plates 11 are heated efficiently, thereby significantly increasing the separation performance. An automatic control electric heating element 10 with a rated power of 120W is...

Embodiment 2

[0057] The same DCMD system as in Example 1 was used for concentration and desalination of brine, wherein the sealing gasket 13 was a 1.5 mm thick PTFE gasket, and other equipment, processes and operating parameters were the same as in Example 1. The material-liquid side channel 15 enclosed by the heating plate 11, the hydrophobic membrane 12 and the gasket 13 has a cross section as figure 1 In the U-shape shown, the actual distance between the heating plate 11 and the membrane surface 12 should be smaller than the thickness of the gasket 13 due to the deformation of the gasket under the clamping of the fastening bolts of the membrane module. The measured result is 1.02mm. After testing, the membrane flux of this embodiment 2 is 50.1kg / m 2 -h.

Embodiment 3

[0059] The same DCMD system as in Example 1 was used to carry out concentration and desalination of brine. Wherein the sealing gasket 13 adopts 2.0mm thick PTFE gasket, and other equipment, process and operating parameters are all the same as in embodiment 1. The material-liquid side channel 15 enclosed by the heating plate 11, the microporous hydrophobic membrane 12 and the sealing gasket 13 has a cross section as figure 1 In the U-shape shown, the actual distance between the heating plate 11 and the microporous hydrophobic membrane 12 should be smaller than the thickness of the gasket 13 due to the deformation of the gasket under the clamping of the fastening bolts of the membrane module. The measured result is 1.80mm. After testing, the membrane flux of this embodiment 3 is 43kg / m 2 -h.

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Abstract

The invention discloses a flat plate type membrane module integrated with a feed liquid heating function and application of the flat plate type membrane module in membrane distillation. The flat plate type membrane module mainly comprises a heating part, a heating plate, a microporous hydrophobic membrane, sealing gaskets, a membrane supporting plate and a feed liquid side runner, wherein sealing gaskets are arranged on the lower portions of the two ends of the heating plate in the width direction and located at the outer ends of the microporous hydrophobic membrane, a feeding channel and a discharging channel are formed in the two ends of the heating plate in the width direction, the portion, between the two sealing gaskets, of the heating plate and the microporous hydrophobic membrane form the feed liquid side runner, and the two ends of the feed liquid side flow channel communicate with the feeding channel and the discharging channel correspondingly. The height of the feed liquid side runner is 0.8 to 1.8 mm. By effectively controlling the height of the feed liquid side runner within the range of 0.8-1.8 mm, the membrane separation efficiency is remarkably improved, and meanwhile, the energy consumption and the cost in the evaporation and concentration processes such as seawater desalination, sewage treatment and food concentration by adopting an MD method are reduced.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a flat-plate membrane module integrated with a feed liquid heating function and its application in membrane distillation. A compact and high-efficiency flat membrane distillation membrane unit can be obtained through the invention, which can reduce energy consumption and cost of evaporation and concentration processes such as seawater desalination, sewage treatment and food concentration by membrane distillation. Background technique [0002] Membrane distillation (MD) is an energy-saving membrane separation technology that drives steam permeation by the steam pressure difference on both sides of a microporous hydrophobic membrane. It is widely used in seawater desalination, sewage treatment, and food concentration. Different from traditional thermal evaporation and concentration methods (such as multi-effect evaporation, multi-stage flash evaporation, etc.) and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D63/08C02F1/44
CPCB01D63/087B01D61/364C02F1/447Y02A20/131
Inventor 关国强汪奇
Owner SOUTH CHINA UNIV OF TECH
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