Method for producing hydrogen gas by methane-rich plasma

A plasma and methane-enriched technology, applied in chemical instruments and methods, hydrogen, climate sustainability, etc., can solve problems such as arc and system stable operation damage, poor preheating effect of raw material gas, and easy poisoning of catalysts, etc., to achieve improved Energy utilization efficiency, heat loss reduction, and life extension effects

Inactive Publication Date: 2011-10-05
TAIYUAN UNIV OF TECH
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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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  • Method for producing hydrogen gas by methane-rich plasma

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Effect test

Embodiment 1

[0022] like figure 1When implementing the method for hydrogen production of the present invention, open the valve and send the natural gas 8 with a methane content of 98% into the heat exchanger 9 at the bottom of the plasma reactor, send the compressed hydrogen 3 to the plasma generator 2, and start the high The frequency ignition device ignites the arc of the plasma generator to form a plasma jet 4 . When the system reaches a steady state, the natural gas 8 entering the lower heat exchanger 9 of the plasma reactor 6 exchanges heat with the high-temperature hydrogen-rich gas after the plasma reaction, and the natural gas is heated to 300°C-600°C, and the heated natural gas continues to The spiral tube heat exchanger on the upper part of the plasma reactor 6 exchanges heat with the wall of the plasma reactor 6, the natural gas is heated and pre-activated for the second time, and the temperature rises to 600°C-900°C, and the preheated and activated natural gas 11 enters the pla...

Embodiment 2

[0025] like figure 1 , when implementing the hydrogen production method of the present invention, the valve is opened to allow the coal bed gas 8 with a methane content of 98% to enter the heat exchanger 9 at the lower part of the plasma reactor, and the compressed nitrogen gas 3 is sent to the plasma generator 2, and the high-frequency ignition is started The device ignites the plasma generator arc, forming a plasma jet 4 . When the system reaches a steady state, the coal bed gas entering the heat exchanger 9 at the lower part of the plasma reactor exchanges heat with the 900°C-1300°C gas after the plasma reaction, and the coal bed gas is heated to 300°C-600°C, and the heated coal bed The gas continues to exchange heat with the wall of the plasma reactor in the upper heat exchanger 10, the CBM is heated and pre-activated for the second time, and the temperature rises to 600°C-900°C, and the preheated and activated CBM 11 enters the plasma reactor 6, In the reaction zone, it ...

Embodiment 3

[0028] like figure 1 When implementing the method for hydrogen production of the present invention, the mixed gas 8 formed by mixing coke oven gas with a methane content of 26.3% and a hydrogen content of 55.6% with carbon dioxide enters the heat exchanger 9 at the bottom of the plasma reactor 6, and the The mixture of water vapor and oxygen is sent to the plasma generator 2 as the working gas 3, and the high-frequency ignition device is activated to ignite the arc of the plasma generator to form a plasma jet 4. When the system reaches a steady state, the mixed gas entering the lower heat exchanger of the plasma reactor 6 exchanges heat with the 1000°C-1500°C gas after the plasma reaction, the mixed gas is heated to 300°C-800°C, and the heated mixed gas The gas continues to exchange heat with the wall of the plasma reactor, the mixed gas is heated twice, and the temperature rises to 600°C-1000°C, the preheated and activated mixed gas 11 enters the plasma reactor, and generates...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/36
CPCY02P20/10
Inventor 申曙光叶俊岭鲍卫仁吕永康
Owner TAIYUAN UNIV OF TECH
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