A new hydrogen production method and system

Abstract

The invention provides a hydrogen production method. The method comprises the steps of enabling feed gas to enter a pyrolysis reactor in presence of iron powder so as to have reaction, and then separating reaction effluent to obtain a gas phase material and a solid phase material; enabling the gas phase material to enter a sulfur catcher for recovering elemental sulfur, and then enabling the gas phase material without the elemental sulfur to enter a desulfurization device and react with an absorbent to obtain hydrogen-rich gas and rich absorbing liquid; enabling the rich absorbing liquid to enter a regeneration tower to obtain a regenerated absorbent and desorbed gas; sending the solid phase material into a magnetic field separator, and separating to obtain ferrous sulfide and the iron powder. The invention also provides a hydrogen production system. After the hydrogen production method and the hydrogen production system are adopted, the decomposition rate of H2S is improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a new technology for producing hydrogen in the acid gas treatment process. Background technique [0002] Hydrogen sulfide is a toxic gas that pollutes the environment and widely exists in oil and gas exploration, petrochemical, coal chemical and other industries. It must be recycled during the production process. [0003] There are two main methods for the recovery and treatment of hydrogen sulfide in the industry, namely the Claus method and the wet absorption method: the Claus method mainly converts H 2 S is converted into elemental sulfur and water through partial incomplete oxidation and exchange reaction; the wet absorption process is a method of directly oxidizing H with an oxidant in the liquid phase. 2 S method. The disadvantages of these two types of sulfur recovery methods are that the process consumes a lot of energy and the hydrogen has not been rec...

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Problems solved by technology

h 2 The catalytic thermal decomposition of S refers to the H 2 S gas undergoes thermal decomposition reaction on transition metal sulfides, but due to the influence of chemical equilibrium, H 2 The decomposition rate of S is low, so the equilibrium concentration of hydrogen in the system is low; H 2 The direct thermal decomposition of S is the thermal cracking of H under non-catalytic conditions 2 S is decomposed into S and H 2 , due to H 2 The decomposition of S into elemental sulfur and hydrogen requires endothermic reaction, which is a thermodynamically unfavorable reaction, and only at very high temperatures has a higher decomposition rate. According to literature reports, in order to make H 2 S obtains a decomposition rate of more than 50% through direct thermal decomposition, and the reaction temperature must exceed 1658K; the superadiabatic decomposition method is H 2 S in the absence of catalyst and external heat source, using porous media superadiabatic combustion technology to realize H 2 S decomposition, this technology due to the introduction of air for combustion, makes H 2 S in H 2 not fully recycled

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