Low-grade heat energy driven electrode liquid independent hydrogen production method

A low-grade, electrode liquid technology, applied in the electrolysis process, electrolysis components, regenerative fuel cells, etc., can solve the problems of high electrode potential, large energy conversion loss, and large energy consumption

Inactive Publication Date: 2019-05-28
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] From the perspective of hydrogen production, even if the above-mentioned heat-to-electricity conversion technology based on the power conversion positive cycle system develops mature in the future, there are still some shortcomings in the direct use of the high-grade electric energy generated by it to electrolyze water to produce hydrogen, such as high electrode potential and energy consumption. Large amount, high energy conversion loss, etc., and usually requires the temperature of the driving heat source to be above 150°C

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: figure 1 It shows a working flow of a hydrogen production method driven by low-grade thermal energy driven by the reverse electrodialysis principle (without plug-in).

[0029] In the first step, the low-grade thermal energy stream (such as low-temperature heat transfer oil with a temperature of 120-130°C) enters the generator 1 from the inlet of the driving heat source at the bottom left of the generator 1, and the working solution (such as chlorinated Sodium aqueous solution), after releasing heat and cooling down to about 60°C, leave the generator 1 from the outlet of the driving heat source on the upper left of the generator 1. After the waste liquid in the generator 1 is heated by the low-grade thermal energy stream, part of the solvent and a very small amount of solute will evaporate, and escape from the top of the generator in gaseous form and enter the condenser 2. After condensation, phase change, and cooling down to about 50°C in the condenser 2, it...

Embodiment 2

[0039] On the basis of Example 1, if the number of anion and cation exchange membranes (which can significantly improve the output voltage of the reverse electrodialysis stack) is increased to more than 30 pairs, and the variable load 24 is selected as an external electrolyzer, then the reverse electrodialysis Hydrogen production by dialysis-water electrolysis method can produce hydrogen and oxygen at the same time, so that more hydrogen and oxygen can be produced on the original basis. figure 2 shown.

[0040] figure 2 It shows the work flow of a hydrogen production method based on the principle of reverse electrodialysis and driven by low-grade thermal energy for each independent type (external electrolyzer) of the electrode solution. The principle is basically similar to that of Embodiment 1, and the same parts will not be repeated. In addition to increasing the number of ion exchange membranes, the key difference is that the specific embodiment 2 uses an external elect...

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Abstract

The invention discloses a low-grade heat energy driven electrode liquid independent hydrogen production method, and belongs to the technical field of new energy. Low-grade heat energy serves as driving force, and continuous hydrogen production is achieved through the concentration change of a working solution. The low-grade heat energy driven electrode liquid independent hydrogen production methodcomprises the steps: firstly, the low-grade heat energy is converted into chemical potential energy of the working solution through a low-temperature multi-effect distillation method; then the chemical potential energy is converted into the potential difference between two electrodes of a cell stack based on the reverse electrodialysis principle; and then in two types of electrode liquid, hydrogen production and oxygen production are achieved through a reduction reaction or an oxidation reaction occurring on the corresponding hydrogen production and oxygen production electrodes. The waste working solution is recycled after flowing out from the cell stack, and then regenerated under driving of the low-grade heat energy, and the hydrogen production electrode liquid and the oxygen productionelectrode liquid are independently circulated between electrode liquid cavities in the two sides of the cell stack and an electrode liquid storage tank. The low-grade heat energy can be continuously,efficiently and steadily converted to be utilized, a hydrogen production system does not need to operate at the high temperature and high pressure, mechanical moving parts are few, capacity configuration is flexible, and oxygen can be obtained while hydrogen production is conducted.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to a method for realizing continuous hydrogen production with low-grade thermal energy as the driving force and by means of concentration changes of working solutions. Background technique [0002] Hydrogen energy is considered to be a new energy source with great development potential due to its advantages such as high energy density, environmentally friendly combustion products, abundant sources (water) and reserves, and a wide range of applications. At present, the common hydrogen production methods mainly include hydrogen production by electrolysis of water, hydrogen production by gasification of coal, catalytic conversion of heavy oil and natural gas water vapor production, etc., but the energy consumed by these methods is greater than the energy produced by them, and some methods are It will increase carbon emissions and exacerbate air pollution. If the method of hydrogen pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B9/04H01M8/18
CPCY02E60/36Y02E60/50
Inventor 吴曦徐士鸣
Owner DALIAN UNIV OF TECH
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