A closed reverse electrodialysis power generation method and device based on asymmetric ion exchange membrane

A reverse electrodialysis and ion exchange membrane technology, applied in the field of waste heat power generation, can solve the problems of large water consumption, limited application range, complex structure, etc., and achieve the effects of energy saving, high power generation efficiency, and small concentration polarization phenomenon.

Active Publication Date: 2020-04-10
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this technology has problems such as complex RED module structure, large water consumption, limited application range, and the need to continuously replenish fresh concentrated and fresh water. Therefore, it is necessary to provide a reverse electrodialysis power generation device and power generation method to solve one of the above problems

Method used

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  • A closed reverse electrodialysis power generation method and device based on asymmetric ion exchange membrane
  • A closed reverse electrodialysis power generation method and device based on asymmetric ion exchange membrane
  • A closed reverse electrodialysis power generation method and device based on asymmetric ion exchange membrane

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Effect test

preparation example Construction

[0047] In a specific implementation process, the electrode is a carbon nanotube / lithium manganate composite electrode, which can be prepared by the following method:

[0048] First, the carbon nanotubes with a length of 30-100μm and an outer diameter of 10-20nm are ultrasonically dispersed in N-Methyl pyrrolidone, and then LiMn 2 O 4 Add to the CNT dispersion liquid, ultrasonic and suction filtration to obtain the carbon nanotube / lithium manganate composite material, the material and the binder polyvinylidene fluoride (Poly (vinylidene fluoride),) in the NMP after mixing and stirring, scrape coating on CNT / LMO electrode was obtained by vacuum drying on carbon-coated aluminum foil. This electrode can be used directly without the cathode and anode room. In the present invention, CNT is the abbreviation of carbon nanotube, NMP is the abbreviation of N-methyl-2-pyrrolidone, and PVDF is the abbreviation of polyvinylidene fluoride.

[0049] In a preferred implementation process, the ele...

Embodiment 1

[0070] figure 1 It is a closed reverse electrodialysis power generation device used in the present invention, which is mainly composed of reverse electrodialysis module 1, gas-liquid separation generator 2, condenser 3, heat exchanger 4, peristaltic pump 5, valve 6, cation exchange Membrane 7, anion exchange membrane 8, electrode 9, concentrated solution tank 10, and weak solution tank 11.

[0071] The cation exchange membrane in the device is an asymmetric ion exchange membrane made of PES / SPEEK, with a thickness of 34μm, a large pore size of 125nm, and a small pore size of 11nm; the anion exchange membrane is an asymmetric ion exchange membrane made of PES / SPEEK / PDA. The thickness is 36μm, the large pore size is 125nm, and the small pore size is 7nm; the electrode is a sheet carbon nanotube / lithium manganate composite electrode with a thickness of 500μm; the working fluid is a lithium bromide solution, and the concentration of the concentrated lithium bromide solution is 0.5M. ...

Embodiment 2

[0078] The power generation device and the power generation process are exactly the same as in Example 1, except that the following parameters in the power generation device are changed:

[0079] The cation exchange membrane in the device is an asymmetric ion exchange membrane made of PES / SPEEK, with a thickness of 35μm, a large pore size of 250nm, and a small pore size of 15nm; the anion exchange membrane is an asymmetric ion exchange membrane made of PES / SPEEK / PDA. The thickness is 37.5μm, the large pore size is 250nm, and the small pore size is 12nm; the electrode is a 550μm flake carbon nanotube / lithium manganate composite electrode; the working fluid is a lithium bromide solution, and the concentration of the concentrated lithium bromide solution is 0.5M. The concentration of the dilute lithium bromide solution is 0.01M.

[0080] The results show that when the external resistance is 1000Ω, the output power of the generator is 0.025W / m 2 .

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Abstract

The invention provides a closed type reverse electrodialysis generation device based on asymmetric ion exchange membranes. A reverse electrodialysis module of the generation device comprises asymmetric zwitterion exchange membranes in alternative arrangement, the diffusion of the ion is convenient, the thickness of the membrane layer is comparatively small at the same time, so that the membrane resistance is effectively reduced; secondly, by adopting the carbon nano-tube / lithium manganate electrode which is free from combining with the cathode and anode chambers, a salinity gradient generationdevice is simplified; furthermore, the device further performs heat exchange process in the system while utilizing the waste heat, and the energy is saved when the waste heat is converted into the electric energy; the working liquid is recycled in the whole generation process, the consumption of the salt and the water is greatly saved. The generation method based on the generation device has theadvantages of being small in membrane resistance, small in concentration polarization phenomenon, and high in generation efficiency. Numerous problems in the prior art are solved, and the method and device have good application prospect in the salinity gradient generation field.

Description

Technical field [0001] The invention relates to the technical field of using waste heat to generate electricity. More specifically, it relates to a closed reverse electrodialysis power generation method and device using waste heat. Background technique [0002] After the second industrial revolution, mankind entered the "Electrical Age". The rapid development of human economic activities has promoted the increasing demand for energy. Today, electricity has become an important driving force for social development and one of the indispensable energy sources for production and life. Traditional mainstream power generation methods have disadvantages such as non-renewable, low power generation efficiency, and environmental pollution. The use of fossil fuels to generate electricity leads to climate change, and the increasingly depleted fossil fuels make human beings face severe energy security issues. Hydropower generation affects the natural environment and biological survival. N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N3/00
CPCH02N3/00
Inventor 闻利平孙悦赵晓璐孔祥玉江雷
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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