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Multi-effect membrane distillation device with efficient internal heat reclamation function and method

A multi-effect membrane distillation and heat recovery technology, which is applied to chemical instruments and methods, distillation separation, separation methods, etc., can solve problems such as unspecified experimental data, and achieve the effects of simple operation, compact structure, and low energy consumption

Active Publication Date: 2011-06-08
天津凯铂能膜工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the example of this patent, the effect of heat recovery and utilization is better by connecting multiple frame components in a certain way, but the detailed experimental data is not clearly given in the example of this patent

Method used

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  • Multi-effect membrane distillation device with efficient internal heat reclamation function and method
  • Multi-effect membrane distillation device with efficient internal heat reclamation function and method
  • Multi-effect membrane distillation device with efficient internal heat reclamation function and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Feed liquid: a sodium chloride (NaCl) aqueous solution with a salt concentration of 3% by weight, which is equivalent to the salt concentration in the original seawater from seawater desalination.

[0055] Feed liquid feed temperature: 25~30℃

[0056] Heat source: hot water with a temperature of 98-100°C

[0057] Mode of operation: use figure 2 The cold feed method shown for the multi-effect membrane distillation process

[0058] Experimental results:

[0059] The water flux of the multi-effect hollow fiber membrane module is: 6.28L / (m 2 h).

[0060] The water making ratio is: 12.5.

[0061] The conductivity of distilled water is: 3.2μs / cm.

Embodiment 2

[0063] Feed liquid: a sodium chloride (NaCl) aqueous solution with a salt concentration of 6% by weight, which is equivalent to the salt concentration in the by-product concentrated brine produced in the traditional seawater desalination process.

[0064] Feed liquid feed temperature: 25 ~ 30 ℃.

[0065] Heat source: hot water with a temperature of 98-100°C.

[0066] Mode of operation: use figure 2 The cold-feed approach shown is for a multi-effect membrane distillation process.

[0067] Experimental results:

[0068] The water flux of the multi-effect hollow fiber membrane module is: 5.88L / (m 2 h).

[0069] The water making ratio is: 10.4.

[0070] The conductivity of distilled water is: 7.2μs / cm.

Embodiment 3

[0072] Feed liquid: the weight percent concentration of salt is 15% sodium chloride (NaCl) aqueous solution.

[0073] Feed liquid feed temperature: 95 ~ 100 ℃.

[0074] Cold source: ground water.

[0075] Mode of operation: use figure 1 The hot feed mode shown carries out the multi-effect membrane distillation process.

[0076] Experimental results:

[0077] The water flux of the multi-effect hollow fiber membrane module is: 4.20L / (m 2 h)

[0078] The water making ratio is: 7.6.

[0079] The conductivity of distilled water is: 10.2μs / cm.

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Abstract

The invention relates to a multi-effect membrane distillation device with efficient internal heat reclamation function and a method. The middle part of a membrane shell is provided with a cavity, two ends of the membrane shell are provided with an inlet and an outlet respectively, hollow fibrous membranes and hollow fiber pipes arranged uniformly are arranged in the cavity of the membrane shell, joints at two ends of the hollow fibrous membranes and the hollow fiber pipes are connected with the inlet and the outlet respectively, the lower end of the membrane shell is provided with a distillate outlet, and an external heat exchanger is connected in series between the inlet and the outlet of the water return end of a membrane assembly. The device has compact structure, simple and mild operating condition, low energy consumption and high water making rate, and can be used for small-scale dispersed implementation and integrated application; the method can be used in the fields of sea water desalinization, bitter water desalinization, concentration treatment of aqueous solution of nonvolatile or semi-volatile solutes, environmental protection and the like; and particularly when the method is used for concentration of aqueous solution of nonvolatile and semi-volatile solutes such as sodium chloride, ammonium sulfate, ammonium nitrate, sodium nitrate, sodium carbonate, sodium hydroxide, sulfuric acid, hydrochloric acid, glucose, xylitol, urea, glycerol, ethylene glycol, lactic acid, glyoxylic acid, dimethyl sulfoxide, sulfolane and the like, normal pressure steam or hot water is used as a heat source, and the highest water making rate can reach 13.7.

Description

technical field [0001] The invention belongs to the technical fields of water treatment, seawater desalination and environmental protection, and in particular relates to a multi-effect membrane distillation device and method with efficient internal heat recovery function. Background technique [0002] Water is the source of life, a precious and irreplaceable natural resource for human beings, and the lifeblood of social and economic development. my country's annual per capita fresh water resources are about 2,400 cubic meters, which is 1 / 4 of the world's per capita fresh water resources and ranks 110th among 149 countries in the world. It is a country with severe water shortages. Among them, the per capita water resources in North China are less than 400 cubic meters, which is already a serious problem. Water-scarce areas. The scarcity of water resources and the increasingly serious water pollution have become the bottleneck restricting the social progress and economic devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D3/00C02F1/08
CPCY02A20/124Y02W10/37
Inventor 秦英杰刘立强何菲刘丹丹吴茵
Owner 天津凯铂能膜工程技术有限公司
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