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A continuous salt difference power generation device and method

A power generation device and salt difference technology, which is applied in the field of continuous salt difference power generation devices, can solve the problems of device operation stability, adverse effects of input costs, increased process complexity and power generation costs, and large amount of salt and fresh water supply, etc., to achieve Eliminate concentration polarization phenomenon, high-efficiency continuous power generation, and high power generation efficiency

Active Publication Date: 2021-06-29
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reverse electrodialysis salt difference power generation technology still has technical problems such as low power generation efficiency, large salt and fresh water supply, and high energy consumption for continuous power generation.
At present, some researchers have proposed to use special ion exchange membranes or salt solutions to improve power generation efficiency, but it will have adverse effects on device operation stability, input costs, etc.
In addition, some researchers have proposed to recycle salt liquid through waste heat and other evaporation methods to achieve the purpose of closed power generation, but gas-liquid separation, heat exchange, etc. increase process complexity and power generation costs

Method used

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  • A continuous salt difference power generation device and method
  • A continuous salt difference power generation device and method

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Experimental program
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Effect test

Embodiment 1

[0050] combine figure 1 and figure 2 As shown, the ion exchange membrane resistance of the reverse electrodialyzer 12 is 2 Ω·cm 2 , the membrane surface flow rate is 4.5 cm / s; the forward osmosis membrane of the forward osmosis device 13 is a hollow fiber membrane with a composite functional layer of silicon oxide nanoparticles, and the flow rate of the feed liquid is twice the flow rate of the draw liquid; the salt in the concentrated salt solution tank 14 Liquid is 10% sodium chloride solution, and the salt solution of light salt solution tank 15 is 0.5% sodium chloride solution. The forward osmosis draw solution of the forward osmosis device 13 is 23% ammonium chloride solution. The anode 122 and cathode 121 were tested with a wire connected load with a power density of 7.2 W / m 2 .

Embodiment 2

[0052] combine figure 1 and figure 2 As shown, the ion exchange membrane resistance of the reverse electrodialyzer 12 is 2 Ω·cm 2 , the membrane surface flow rate is 4.5 cm / s; the forward osmosis membrane of the forward osmosis device 13 is a hollow fiber membrane with a composite functional layer of silicon oxide nanoparticles, and the flow rate of the feed liquid is 1.5 times of the flow rate of the draw liquid; the salt of the concentrated salt solution tank 14 Liquid is 5% sodium chloride solution, and the salt solution of light salt solution tank 15 is 0.3% sodium chloride solution. The forward osmosis draw solution of the forward osmosis device 13 is 20% ammonium bicarbonate solution. The anode 122 and cathode 121 were tested with a wire connected load with a power density of 5.6 W / m 2 .

Embodiment 3

[0054] combine figure 1 and figure 2 As shown, the ion exchange membrane resistance of the reverse electrodialyzer 12 is 2 Ω·cm 2 , the membrane surface flow rate is 5 cm / s; the forward osmosis membrane of the forward osmosis device 13 is a hollow fiber membrane with a composite functional layer of titanium oxide nanoparticles, and the flow rate of the feed liquid is twice the flow rate of the draw liquid; the salt of the concentrated salt solution tank 14 Liquid is 12% sodium chloride and sodium sulfate mixed solution, and the salt solution of light salt solution tank 15 is 0.3% sodium chloride and sodium sulfate mixed solution. The forward osmosis draw solution of the forward osmosis device 13 is 23% ammonium chloride solution. The anode 122 and the cathode 121 are tested by connecting the load with a wire, and the power density is 8.7W / m 2 .

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Abstract

The invention relates to a continuous salt difference power generation device, which includes a dilution device, a reverse electrodialyzer, a forward osmosis device, a concentrated salt liquid tank and a light salt liquid tank; the concentrated salt liquid tank contains the concentrated salt liquid, and the light salt liquid tank contains Light salt solution, the concentration of the concentrated salt solution is greater than that of the light salt solution; the reverse electrodialyzer is provided with a cathode and an anode, and between the cathode and the anode are alternately arranged cation exchange membranes and anion exchange membranes and alternately distributed concentrated solution chambers and Dilute liquid chamber; a potential difference is formed between the cathode and anode of the reverse electrodialyzer; the concentrated salt solution circulates between the concentrated liquid chamber of the reverse electrodialyzer and the concentrated salt liquid tank, and the light salt solution is circulated in the reverse electrodialyzer Circulation between the light liquid chamber and the light salt liquid tank, the dilution device provides diluent to maintain the light salt solution at a low concentration, the forward osmosis device provides concentration to maintain the concentrated salt solution at a high concentration, and concentrates part of the light salt solution Used to replenish concentrated brine. The device of the invention can utilize the salt concentration difference to realize cycle continuous power generation, and has the characteristics of high power generation efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical energy power generation, and in particular relates to a continuous salinity difference power generation device and method realized by reverse electrodialysis and forward osmosis membranes. Background technique [0002] With the rapid development of the global economy, people's demand for energy is increasing. Since mankind entered the electrical age, electric energy has become an important driving force for social development due to its advantages of being economical, clean, and easy to convert and control. It has been used in all aspects of human life. Traditional fossil fuel power generation has problems such as large consumption of non-renewable resources and serious environmental pollution. Hydropower generation and other new energy technologies are limited by factors such as natural environment conditions, regional adaptability, operational stability, and storage safety. Therefore, it is urg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N3/00
CPCH02N3/00
Inventor 祝海涛杨波吴雅琴
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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