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Method and system for hydrogen production and electricity production by two-step thermochemical cycle decomposition of water

A thermochemical cycle and water splitting technology, applied in chemical instruments and methods, hydrogen production, inorganic chemistry, etc., can solve the problem of low energy utilization and hydrogen production efficiency, which do not meet the requirements of global sustainable development and strategic requirements, Exacerbate problems such as global energy exhaustion, achieve the effect of improving energy utilization, saving storage and transportation costs, and avoiding emissions

Inactive Publication Date: 2021-02-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The energy utilization rate and hydrogen production efficiency of the current technologies of thermochemical cycle decomposition of water and electrolysis of water to produce hydrogen are not high. If they still use non-renewable energy as the energy source, it will aggravate the exhaustion of global energy. Global Sustainability Requirements and Strategic Requirements

Method used

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  • Method and system for hydrogen production and electricity production by two-step thermochemical cycle decomposition of water
  • Method and system for hydrogen production and electricity production by two-step thermochemical cycle decomposition of water

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Under the conditions of solar flux C=5000 and constant pressure of 1bar, solid zinc oxide enters the solar reactor at a molar rate of 1mol / s. The solar reactor is a window rotating cavity receiver that absorbs concentrated solar energy and works The temperature is 2300K, and the solid zinc oxide is thermally decomposed into oxygen and zinc vapor in the reactor.

[0041] The inert gas is passed into the solar reactor, the molar ratio of the inert gas and the zinc vapor is kept below 10, and the gaseous product oxygen and zinc vapor are swept out of the reactor by the continuous flow of the inert gas and enter the quenching device.

[0042] The quenching device is a water-cooled condenser, in which 2300K oxygen and zinc vapor are rapidly cooled to 700K oxygen and zinc liquid, and oxygen and zinc liquid can be separated naturally.

[0043] Put the separated zinc liquid and water vapor with a molar rate of 1mol / s into the hydrolysis reactor, and at a temperature of 700K, hy...

Embodiment 2

[0048] Under the conditions of solar flux C=10000 and constant pressure of 1bar, solid zinc oxide enters the solar reactor at a molar rate of 1mol / s. The solar reactor is a window rotating cavity receiver that absorbs concentrated solar energy and works The temperature is 2300K, and the solid zinc oxide is thermally decomposed into oxygen and zinc vapor in the reactor.

[0049] The inert gas is passed into the solar reactor, the molar ratio of the inert gas and the zinc vapor is kept below 10, and the gaseous product oxygen and zinc vapor are swept out of the reactor by the continuous flow of the inert gas and enter the quenching device.

[0050] The quenching device is a water-cooled condenser, in which 2300K oxygen and zinc vapor are rapidly cooled to 700K oxygen and zinc liquid, and oxygen and zinc liquid can be separated naturally.

[0051] Put the separated zinc liquid and water vapor with a molar rate of 1mol / s into the hydrolysis reactor, and at a temperature of 700K, h...

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Abstract

The invention belongs to the related technical field of new energy utilization, and discloses a method and a system for hydrogen production and electricity production by two-step thermochemical cycledecomposition of water. The method comprises the following steps: S1, carrying out a two-step thermochemical cycle water decomposition hydrogen production reaction which comprises two steps: 1, carrying out an endothermic reduction reaction on zinc oxide by using solar energy to obtain oxygen and zinc vapor, and 2, carrying out a water decomposition reaction by using zinc and water vapor to obtainhydrogen, zinc oxide and heat energy; and s2, enabling the oxygen in the first-step endothermic reduction reaction and the hydrogen obtained in the second-step hydrolysis reaction to be recycled andfed into a fuel cell for power generation, and therefore recycling of the oxygen and the hydrogen and conversion from solar energy to electric energy are achieved; and recycling the heat energy obtained in the hydrolysis reaction in the second step for electrolyzing water to generate hydrogen and oxygen, so as to realize the preparation of hydrogen. According to the invention, stable electric energy and high-purity hydrogen are obtained.

Description

technical field [0001] The invention belongs to the technical field related to the utilization of new energy, and more specifically relates to a method and a system for producing hydrogen and electricity by decomposing water in a two-step thermochemical cycle. Background technique [0002] At present, there are many methods of hydrogen production, one of the more representative ones is thermochemical cycle decomposition of water to produce hydrogen, and the direct decomposition of water to produce hydrogen requires a temperature above 2500 ° C. At the same time, there is still the problem of separation of high-temperature gases. It is not feasible under normal circumstances, but hydrogen can be obtained by decomposing water at a lower temperature through thermochemical cycle decomposition of water. The total efficiency of the thermochemical cycle water splitting hydrogen production process can reach 50%. Coupled with solar energy, it is expected to become a large-scale produ...

Claims

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Application Information

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IPC IPC(8): C25B5/00C25B1/04C25B1/55C01B3/04C01B13/02
CPCC01B3/042C01B13/0207C25B1/04C25B5/00Y02E60/36Y02P20/10Y02P20/133
Inventor 温昶阳威石学强孟桓如秦效东秦龙刘天雨徐明厚
Owner HUAZHONG UNIV OF SCI & TECH
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