Vacuum multiple-effect membrane distillation device coupled with venturi effect

A multi-effect membrane distillation and Venturi effect technology, which is applied in the field of vacuum multi-effect membrane distillation devices, can solve problems such as vacuum multi-effect membranes that have not yet been applied, so as to prolong continuous and stable operation time, reduce overall energy consumption and operating costs, and reduce The effect of energy consumption

Inactive Publication Date: 2017-09-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this technology has not been applied in the vacuum multi-effect membrane distillation process.

Method used

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  • Vacuum multiple-effect membrane distillation device coupled with venturi effect
  • Vacuum multiple-effect membrane distillation device coupled with venturi effect
  • Vacuum multiple-effect membrane distillation device coupled with venturi effect

Examples

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Effect test

Embodiment example 1

[0067] In my country, the Venturi-vacuum multi-effect membrane distillation system has broad application prospects. In areas where fresh water resources are scarce but brackish water is abundant, this system can be used to prepare drinking water, domestic and production water. In addition, the device can also be used to treat high-salt wastewater produced by the chemical industry.

[0068] The use concentration is 35g·L -1 The NaCl salt solution is used as the raw material solution, and the flow rate is controlled by a rotameter to 120L h -1 , the flow of hot water in the hot water tank 15 is 600L·h -1 , the temperature of the raw material liquid is controlled at 80°C before entering the evaporation zone 8, and the flow rate of the cold water in the Venturi system (cold side) is controlled at 360L h -1 , the pressure generated at the water vapor inlet 32 ​​is 10kPa, and the maximum membrane flux obtained is 32L·m after continuous operation for 72 hours -2 h -1 , the conduc...

Embodiment example 2

[0076] The use concentration is 35g·L -1 The NaCl salt solution is used as the raw material solution, and the flow rate is controlled by a rotameter to 120L h -1 , the hot water flow in the hot water tank 15 is 600L·h -1 , the temperature of the raw material liquid before entering the evaporation zone 8 is 65°C, and the flow rate of the cold water in the Venturi system (cold side) is controlled at 360L h -1 , the pressure generated at the water vapor inlet 32 ​​is 10kPa, the continuous operation is 104 hours, and the maximum membrane flux obtained is 12L m -2 h -1 , the conductivity of the product water is 6 μS cm -1 Around, the desalination rate is greater than 99.9%, and the water vapor phase change heat recovery rate is 52.3%.

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Abstract

The invention discloses a vacuum multiple-effect membrane distillation device coupled with a venturi effect, which aims to utilize a multiple-effect membrane distillation component for recycling water vapor transformation heat and improving heat efficiency of a membrane distillation process. In order to further reduce energy consumption of the multiple-effect membrane distillation operation process, a set of simple and easy venturi system is used for replacing a vacuum pump used in the vacuum multiple-effect membrane distillation device. The venturi system is formed by a venturi tube, a control valve, a rotormeter, a diaphragm pump and a producing water / cold water basin. By using the venturi-vacuum multiple-effect membrane distillation system, energy consumption produced during a pump vacuumizing process can be reduced, the damage on the vacuum pump caused by water vapor during long-time operation is avoided, the continuous and stable operation time of the system is prolonged, an existing vacuum multiple-effect membrane distillation system is optimized and simplified, and the overall operation cost of the membrane distillation process is reduced. Meanwhile, producing water is completely collected, transformation heat is fully utilized, and heat efficiency of the membrane distillation process is improved.

Description

technical field [0001] The invention relates to a vacuum multi-effect membrane distillation device, in particular to a vacuum multi-effect membrane distillation device coupled with Venturi effect. Background technique [0002] Membrane distillation technology is a new type of membrane separation technology that uses microporous hydrophobic membranes to block liquids / insoluble solids, and uses the vapor pressure difference generated by solutions with different temperatures on both sides of the membrane as the driving force to allow only water vapor molecules to pass through the hydrophobic membrane. Due to the advantages of high desalination rate, good water quality, high water recovery rate, and ability to treat high-salt wastewater, this technology has attracted widespread attention from academia and industry in recent years. However, the main problem currently limiting the industrialization of this technology is the high energy consumption and operating cost of the water p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D63/04
Inventor 郭智张新妙栾金义章晨林
Owner CHINA PETROLEUM & CHEM CORP
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