Low-grade heat energy driven electrode liquid self-circulating hydrogen production method

Abstract

The invention discloses a low-grade heat energy driven electrode liquid self-circulating 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 self-circulating hydrogen production method comprises 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; thenthe chemical potential energy is converted into the potential difference between two electrodes of a cell stack based on the reverse electrodialysis principle; and then hydrogen and oxygen are produced through a reduction reaction or an oxidation reaction occurring on the hydrogen production electrode and the oxygen production electrode in the same electrode liquid. The waste solution losing partof the chemical potential energy is recycled after flowing out from the cell stack, and then regenerated under driving of the low-grade heat energy; the electrode liquid is self-circulated between a hydrogen production electrode liquid cavity and an oxygen production electrode liquid cavity in the two ends of the cell stack; 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, and capacity configuration is flexible; and the single-type electrode liquid is adopted and is in an electrolyte closed cycle, and long-time operation can be achieved only by supplying deionized water.

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...

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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

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