Mixed sulfur circulating hydrogen production method

A technology of sulfur cycle and dilute sulfuric acid, applied in electrolysis process, electrolysis components, etc., can solve the problems of high water consumption in hydrogen production from fossil fuels, underutilization of by-product gas, unsatisfactory high energy density heat source of sulfuric acid, etc., to achieve Improve economic efficiency and alleviate the effect of high water consumption
CN112030178AActive Publication Date: 2020-12-04TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2020-12-04

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Abstract

The invention discloses a mixed sulfur circulating hydrogen production method, and belongs to the technical field of thermochemical circulating hydrogen production. The method comprises the followingsteps: concentrating and preheating dilute sulfuric acid in a rectifying tower, feeding the concentrated and preheated dilute sulfuric acid into a cracking furnace to be mixed with fuel gas and air, feeding mixed gas generated by cracking into a depolarization electrolytic tank for electrolysis, acquiring a dilute sulfuric acid solution in the anode area, dividing into two parts, sending one partto a rectifying tower, sending the other part to an absorption tower to absorb sulfur dioxide, and in a cathode region of an electrolytic cell, producing a hydrogen product. High-grade steam is used for concentrating and preheating dilute sulfuric acid, and industrial byproduct fuel gas is used for cracking concentrated sulfuric acid at high temperature. Compared with traditional mixed sulfur cycle hydrogen production, the method makes full use of industrial by-product gas, and meets the large-scale requirements of the fields of hydrogen-rich metallurgy, petroleum processing and the like for hydrogen. Meanwhile, fuel gas combustion byproduct water used in the sulfuric acid high-temperature cracking process can be recycled, more water is saved compared with other water decomposition hydrogen production processes, and the process is a hydrogen production process with high industrial application potential.
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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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