Method for producing hydrogen gas by methane-rich plasma

Abstract

The invention relates to a method for producing hydrogen gas by methane-rich plasma. The method comprises the following steps: firstly, exchanging heat between methane-rich gas and reaction high-temperature tail gas; secondly, exchanging heat between the methane-rich gas and a wall of a plasma pyrolysis gasification reactor; and finally, introducing the methane-rich gas to the plasma pyrolysis gasification reactor to have action with a plasma jet generated by a plasma generator to generate gas taking the hydrogen gas as a main composition. The method solves the difficult problems that a traditional process needs a catalyst which is easy to have carbon precipitation and sulphur, halogen and arsenic poisoning and also solves the problems of high energy consumption and the protection of the wall of the reactor in the process of producing hydrogen by plasma. The method has the advantages of short process flow, simple operation, high thermal efficiency and light environmental pollution andis applicable to the fields of fuel gas chemical engineering and plasma chemical engineering.

Description

technical field [0001] The invention relates to a method for producing hydrogen from methane, in particular to a method for producing hydrogen with methane-enriched gas under the action of a plasma jet. technical background [0002] Hydrogen is used in a wide range of fields, mainly for hydrogenation reactions in the production of synthetic ammonia, methanol, and petroleum refining. In addition, there are many applications in the fields of electronics industry, metallurgical industry, food processing, float glass, fine chemical synthesis, aerospace industry and so on. As society pays more and more attention to environmental quality, the content of sulfide and aromatic compounds allowed in gasoline and diesel is gradually reduced, which makes the demand for hydrogen increase. As a clean fuel gas, hydrogen has a high combustion calorific value, and the product of combustion is water, which will not emit greenhouse gases to the environment, so it is an ideal secondary energy s...

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Problems solved by technology

In this invention, the hydrogen-rich gas produced by the reaction has a lower temperature after passing through the catalyst bed, and the preheating effect on the raw material gas is poor; the preheated raw gas enters the two poles of the plasma generator through the connecting pipe outside the reactor In the high-frequency discharge area between the pipes, the preheated gas in the connecting pipe will have a certain amount of heat loss; if the preheated gas volume is large or the air flow is turbulent due to heating, the stable operation of the arc and the system will be destroyed.

[0006] In the above-mentioned prior art, the tail gas after hydrogen production by plasma enters the catalyst bed, which can increase the yield of hydrogen, but the catalyst is easily poisoned. In order to overcome the problem of catalyst poisoning, it is necessary to purify the raw material gas and the working gas of the plasma generator. It also makes the process complicated

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