Directly contacting distillation desalting hollow fiber membrane apparatus and method

A desalination device and fiber membrane technology, applied in the field of hollow fiber direct contact membrane distillation desalination device, can solve the problems of reduced membrane water flux, high conduction heat loss, and reduced membrane efficiency, and achieve good anti-pollution performance, water production The effect of high flux and increased salt production efficiency

Active Publication Date: 2007-11-14
TIANJIN HYDROKING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The water evaporation rate at the membrane-brine interface is largely limited by the heat transfer coefficient of the interface layer, that is, the temperature polarization effect reduces the water flux of the membrane;
[0007] 2. High conduction heat loss;
[0008] 3. During long-term operation, membrane fouling will lead to a decrease in membrane efficiency and leakage of brine;
[0009] 4. High water production cost;
[0010] 5. The cost of equipment is high and the process is complicated

Method used

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  • Directly contacting distillation desalting hollow fiber membrane apparatus and method
  • Directly contacting distillation desalting hollow fiber membrane apparatus and method
  • Directly contacting distillation desalting hollow fiber membrane apparatus and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Membrane module: polyvinylidene fluoride porous non-polar hollow fiber membrane inner diameter: 1000 microns, membrane thickness 100 microns, membrane porosity 40%, pore diameter 0.1 microns; effective length 80 cm, total membrane thickness 30 cm, packing density 0.2 , the ends of the hollow fiber membranes are bonded together by a silicone adhesive;

[0073] The diameter of the hole in the center of the polyethylene porous plate is 0.10cm, and the holes are arranged in a ring, and the hole diameter increases to 2.0cm in turn;

[0074] The hollow plate is made of polyacrylic acid material;

[0075] Inlet temperature of hot salt solution: 60°C, interstitial velocity: 300cm / min, concentration by weight: 3%;

[0076] Cooling water inlet temperature: 15°C, line speed: 1500cm / min.

[0077] The water flux of the membrane is 33kg / m 2 -h.

Embodiment 2

[0083] Membrane module: polytetrafluoroethylene (PTFE) porous non-polar hollow fiber membrane inner diameter: 350 microns, membrane thickness 300 microns, membrane porosity 60%, pore diameter 0.8 microns; effective length 50cm, total membrane thickness 150cm, packaged Density 0.4, the ends of hollow fiber membranes are bonded together by silicone adhesive;

[0084] The diameter of the hole in the center of the polypropylene porous plate is 0.2cm, and the holes are arranged in a ring, and the hole diameter increases to 2.0cm in turn;

[0085] The hollow plate is made of plexiglass material;

[0086] Hot salt solution inlet temperature: 90°C, interstitial velocity: 50cm / min, concentration by weight: 15%;

[0087] Cooling water inlet temperature: 30°C, line speed: 3000cm / min.

[0088] The water flux of the membrane is 109kg / m 2 -h.

Embodiment 3

[0094]Membrane module: perfluorodimethyldioxole-tetrafluoroethylene (PDD-TFE) porous non-polar hollow fiber membrane inner diameter: 1500 microns, membrane thickness 500 microns, membrane porosity 45%, pore diameter 0.5 microns; effective length 10cm, total membrane thickness 1cm, packing density 0.08, the hollow fiber membranes are bonded together at the ends by epoxy resin adhesives;

[0095] The diameter of the hole in the center of the polyacrylic acid porous plate is 0.08cm, and the holes are arranged in a ring, and the hole diameter increases to 0.8cm in turn;

[0096] The hollow plate is made of polyvinylidene fluoride;

[0097] Hot salt solution inlet temperature: 80°C, interstitial velocity: 500cm / min, weight percent concentration: 30%;

[0098] Cooling water inlet temperature: 50°C, line speed: 5000cm / min.

[0099] The water flux of the membrane is 72kg / m 2 -h.

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Abstract

The directly contacting membrane desalting apparatus with hollow fiber includes membrane tank, porous non-polar hollow fiber membrane arranged inside the membrane tank, porous plates and arc core cover plates. Two porous plates are set separately on two sides of the membrane tank; two arc core cover plates are set separately on the outer sides of the porous plates; the membrane tank, the porous plates and the core cover plates are arranged in parallel; and sealing rubber rings are set between the membrane tank and the porous plates and between the porous plates and the core cover plates. The desalting apparatus of the present invention has high water producing capacity, low water producing cost, high sea water recovering rate, simple operation and wide application range.

Description

technical field [0001] The invention relates to an aqueous solution desalination device, in particular to a hollow fiber direct contact membrane distillation (DCMD) desalination device. Background technique [0002] Water resources are the lifeline of human survival and economic and social development. Water scarcity has become a global hot topic. my country's per capita water resources are only 1 / 4 of the world's per capita water resources, and the per capita water resources in North China are less than 400m 3 , has been a serious water shortage area, desalination of seawater is the only hope to realize the production of new water sources from the water crisis and water pollution dilemma. Drawing fresh water from the vast ocean can not only solve the shortage of the total amount of fresh water, but also open up new permanent sources of fresh water and realize the comprehensive utilization of seawater resources. [0003] Seawater desalination technology has developed rapi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04C02F1/08C02F103/08
CPCY02A20/124Y02W10/37
Inventor 李保安
Owner TIANJIN HYDROKING SCI & TECH
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