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A method for hydrogen production by mixed sulfur cycle

A technology of sulfur cycle and dilute sulfuric acid, applied in electrolysis components, electrolysis process, etc., can solve the problems of high water consumption in hydrogen production from fossil fuels, underutilization of by-product gas, unsatisfactory heat source with high energy density of sulfuric acid, etc., to achieve Alleviating high water consumption and improving economic efficiency

Active Publication Date: 2021-11-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for hydrogen production by mixed sulfur circulation, which aims to solve the following problems in the current hydrogen production process of mixed sulfur circulation: 1) the problem that the high energy density heat source required for the decomposition of sulfuric acid cannot be satisfied; 2) solve the current The problem that a large amount of by-product gas in the steel and petrochemical industries is not fully utilized; 3) Solve the problem of high water consumption in hydrogen production from fossil fuels

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  • A method for hydrogen production by mixed sulfur cycle
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Embodiment 1

[0033] Adopting the solution of the present invention, nuclear energy is used as primary energy, and a mixed sulfur cycle hydrogen production process suitable for the iron and steel industry is designed: the dilute sulfuric acid from the depolarized electrolytic cell is divided into two streams, and one of the dilute sulfuric acid is sent to rectification Tower, rectification and enrichment to 70%. The high-temperature steam generated by the high-temperature air-cooled nuclear reactor is used. After the concentrated sulfuric acid is preheated to 400°C in the heat exchanger, it is mixed with coke oven gas and air from the coking oven of the steel plant and enters the cracking furnace for high-temperature cracking. The cracking temperature is 1000°C. Pressure 0.1MPa, get SO 2 , CO 2 、H 2 O mixed gas. The above mixed gas is pressurized to 1.0Mpa in the pressurized cooling tower and cooled to 80°C, part of the water is separated and sent to the cathode of the depolarization ele...

Embodiment 2

[0037] Adopting the solution of the present invention, nuclear energy is used as the primary energy source to design a mixed sulfur cycle hydrogen production process suitable for the hydrofining of oil products in the petrochemical industry: the dilute sulfuric acid from the depolarization electrolytic cell is divided into two streams, one of which is dilute The sulfuric acid is sent to the rectification tower, where it is concentrated to 90%. The high-temperature steam generated by the high-temperature air-cooled nuclear reactor is used. After the concentrated sulfuric acid is preheated to 550°C in the heat exchanger, it is mixed with the reformed dry gas and air from the refinery unit and enters the cracking furnace for high-temperature cracking. The cracking temperature is 1250°C and the pressure is high. 0.4MPa, get SO 2 , CO 2 、H 2 O mixed gas. The above mixed gas is pressurized to 1.0Mpa in the pressurized cooling tower, and cooled to 80°C, part of the water is separa...

Embodiment 3

[0041] Adopting the solution of the present invention, using solar heat collection and natural gas as primary energy, the process flow of mixed sulfur cycle hydrogen production is designed: the dilute sulfuric acid from the depolarized electrolytic cell is divided into two streams, and one of the dilute sulfuric acid is sent to the rectification tower , Distilled and concentrated to 80%. Using high-temperature steam generated by solar heat collectors, preheat concentrated sulfuric acid to 450°C in a heat exchanger, mix it with natural gas and air, and enter the cracking furnace for high-temperature cracking. The cracking temperature is 1100°C and the pressure is 0.2MPa to obtain SO 2 , CO 2 、H 2 O mixed gas. The above mixed gas is pressurized to 1.0Mpa in the pressurized cooling tower, and cooled to 80°C, part of the water is separated, and sent to the cathode of the depolarization electrolysis cell. The remaining unliquefied gas enters the absorption tower, is absorbed by ...

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Abstract

The invention discloses a hydrogen production method with mixed sulfur circulation, which belongs to the technical field of thermochemical circulation hydrogen production. In this method, dilute sulfuric acid is concentrated in a rectification tower first, and after preheating, it enters a cracking furnace and mixes with fuel gas and air. It is divided into two streams, one of which is sent to the rectification tower, and the other is sent to the absorption tower to absorb sulfur dioxide; the cathode area of ​​the electrolytic cell produces hydrogen products. The invention uses high-grade steam to concentrate and preheat dilute sulfuric acid, and uses industrial by-product fuel gas to crack concentrated sulfuric acid at high temperature. Compared with the traditional mixed sulfur cycle hydrogen production, this method makes full use of industrial by-product gas and meets the large-scale demand for hydrogen in hydrogen-rich metallurgy, petroleum processing and other fields. At the same time, the fuel gas combustion by-product water used in the sulfuric acid pyrolysis process can be recycled, which is more water-saving than other water splitting hydrogen production processes, and is a hydrogen production process with strong industrial application potential.

Description

technical field [0001] The invention relates to a mixed sulfur cycle hydrogen production method, in particular to a mixed sulfur cycle hydrogen production technology based on high-grade heat source and industrial by-product gas pyrolysis of sulfuric acid, and belongs to the technical field of thermochemical cycle hydrogen production. Background technique [0002] As the simplest process of thermochemical water splitting hydrogen production, mixed sulfur cycle hydrogen production contains only two reactions, one of which is thermochemical reaction—sulfuric acid decomposition reaction; and the other reaction is electrochemical reaction, that is, sulfur dioxide removal Polarized electrolytic reaction. The chemical equations of the above two reactions are as follows: [0003] h 2 SO 4 → SO 2 +H 2 O+1 / 2O 2 [0004] 2H 2 O+SO 2 →H 2 SO 4 +H 2 [0005] The above two reactions are combined, and the total reaction is the decomposition of water to generate hydrogen and ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B1/22C25B15/08
CPCC25B1/04C25B1/22C25B15/08Y02E60/36
Inventor 丁溪锋陈崧哲张平王来军
Owner TSINGHUA UNIV
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