Continuous salinity gradient power generation device and method

A power generation device and salt difference technology, applied in the field of continuous salt difference power generation device, can solve the problems of increasing process complexity and power generation cost, device operation stability, adverse impact of input cost, large amount of salt and fresh water supply, etc.

Active Publication Date: 2021-04-27
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 gener

Method used

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  • Continuous salinity gradient power generation device and method

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Experimental program
Comparison scheme
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 salinity gradient power generation device. The device comprises a dilution device, a reverse electrodialyzer, a forward osmosis device, a concentrated salt liquid tank and a light salt liquid tank; the concentrated salt solution tank contains a concentrated salt solution, the light salt solution tank contains a light salt solution, and 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 a cation exchange membrane, an anion exchange membrane, a thick liquid chamber and a thin liquid chamber are alternately arranged between the cathode and the anode; a potential difference is formed between the cathode and the anode of the reverse electrodialyzer; the concentrated salt solution circulates between a concentrated solution chamber and a concentrated salt solution tank of the reverse electrodialyzer, the light salt solution circulates between a light solution chamber and a light salt solution tank of the reverse electrodialyzer, the dilution device provides a diluent to maintain the light salt solution at a low concentration, the forward osmosis device provides a concentration effect to maintain the concentrated salt solution at a high concentration, and part of the light salt solution is concentrated and then is used for supplementing the strong salt solution. The device disclosed by the invention can realize cyclic continuous power generation by utilizing the salt concentration difference and has the characteristic 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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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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