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Novel solar energy reduced-pressure multiple-effect membrane distillation apparatus

A multi-effect membrane distillation, solar energy technology, applied in membrane, pervaporation, membrane technology and other directions, can solve the problems of high energy consumption and operating costs, and the solar decompression multi-effect membrane has not been applied, so as to improve the thermal energy utilization efficiency and prolong the The effect of continuous and stable operation time and reduction of construction costs

Active Publication Date: 2017-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main problems restricting the industrial application of membrane distillation is that the use of traditional methods (electric heating) to heat the raw material solution results in high energy consumption and operating costs
However, this technology has not yet been applied to the process of solar decompression multi-effect membrane distillation.

Method used

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  • Novel solar energy reduced-pressure multiple-effect membrane distillation apparatus
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  • Novel solar energy reduced-pressure multiple-effect membrane distillation apparatus

Examples

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Embodiment example 1

[0067] Most areas in my country belong to category 3 and above sunshine areas (areas where solar energy can be utilized), and the annual sunshine hours are more than 2,000 hours. Therefore, the Venturi-solar decompression multi-effect membrane distillation system has broad application prospects, especially in areas where fresh water resources are scarce but brackish water is abundant, and the system can be used to prepare drinking water and domestic water.

[0068]In a city in my country's Type 3 sunshine area, under typical sunny weather conditions in summer. The intensity of solar radiation gradually increases from 8:00 a.m. to the strongest between 12:00 and 14:00 noon, and then gradually weakens. The average total irradiance exceeds 900W·m 2 , the total daily solar radiation can reach 20MJ m 2 d -1 . At this time, the daily average efficiency and instantaneous efficiency of the vacuum tube collector are roughly 45% and 70%, respectively. The outdoor ambient temperature...

Embodiment example 2

[0078] In a city in the third type of sunshine area in my country, under the typical cloudy weather in summer. The solar radiation intensity is very low, and the total daily solar radiation is less than 8MJ m 2 d -1 . The outdoor ambient temperature is between 30-34°C.

[0079] The temperature in the water storage tank 35 and the hot water tank 13 changes with the intensity of solar radiation, and the temperature range is between 50-60°C. 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 13 is 600L·h -1 , the temperature of the raw material liquid before entering the evaporation zone 8 is 54°C, and the flow rate of the cold water in the Venturi tube system (cold side) is controlled at 360L h -1 , the pressure generated at the water vapor inlet 51 is 10kPa, and the maximum membrane flux obtained by continuous operation for 6 h...

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Abstract

The invention discloses a novel solar energy reduced-pressure multiple-effect membrane distillation apparatus, and aims to utilize solar energy to replace conventional electrical heating as a heat source and heat a raw material fluid to reach a goal of saving energy and reducing consumption. A set of simple Venturi system is used to replace a vacuum pump which is used in the reduced-pressure multiple-effect membrane distillation, so that energy consumption in a membrane distillation operation process is further reduced, and 100% collection of produced water is realized, and the membrane flux is improved. The application of multiple-effect membrane components realizes the effective utilization of phase transformation heat of a water vapor, and the heat-utilization rate is improved. The novel Venturi-solar energy reduced-pressure multiple-effect membrane distillation system is adopted, so that the total energy consumption and the operation cost in the membrane distillation process are greatly reduced.

Description

technical field [0001] The invention relates to a multi-effect membrane distillation device, in particular to a novel solar decompression multi-effect membrane distillation device. Background technique [0002] Membrane distillation technology is a new separation technology that combines traditional distillation and membrane technology, and can be applied to desalination, desalination and concentration of seawater / brackish water / industrial wastewater. Membrane distillation uses a microporous hydrophobic membrane to separate two solutions with different temperatures, and uses the vapor partial pressure difference of the permeable components on both sides of the hydrophobic membrane as the driving force to make the permeable components in the raw material solution on the higher temperature side The excess component passes through the separation membrane in the form of gas molecules to achieve mass transfer; at the same time, liquid, insoluble matter and ions cannot pass throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36C02F1/14C02F1/44
CPCB01D61/364B01D61/366B01D2311/26C02F1/14C02F1/447Y02A20/212Y02W10/37
Inventor 郭智张新妙栾金义彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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