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Hydrogen extraction method capable of adjusting hydrogen-carbon ratio of natural gas direct cracking circulation reaction gas

A cyclic reaction, natural gas technology, applied in chemical instruments and methods, hydrogen, hydrogen separation, etc., can solve the problems of high hydrogen yield, high methane conversion rate and utilization rate

Active Publication Date: 2020-06-05
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Thirdly, the selection and adjustment of the ratio of methane catalytic direct cracking cycle reaction gas depends on the process selection of the catalytic direct cracking reactor. At present, there is no way to produce qualified hydrogen products with a purity exceeding 99.99%, and to pass Control and adjustment of the usage amount of circulating reaction gas and the concentration ratio of hydrogen to methane, and then solve the technical bottleneck of achieving high methane conversion rate and utilization rate and high hydrogen yield at the same time based on catalyst selection alone

Method used

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  • Hydrogen extraction method capable of adjusting hydrogen-carbon ratio of natural gas direct cracking circulation reaction gas
  • Hydrogen extraction method capable of adjusting hydrogen-carbon ratio of natural gas direct cracking circulation reaction gas
  • Hydrogen extraction method capable of adjusting hydrogen-carbon ratio of natural gas direct cracking circulation reaction gas

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Embodiment 1

[0036] A hydrogen extraction method capable of adjusting the hydrogen-to-carbon ratio of natural gas direct cracking cycle reaction gas, comprising the following steps:

[0037] (1) Feed gas: the reaction mixture gas from methane catalytic pyrolysis hydrogen production (that is, natural gas direct cracking hydrogen production), in which hydrogen (H 2) concentration is 50-60% (volume ratio, the following is similar), methane (CH 4 ) concentration is 40-49%, the rest is a small amount of carbon monoxide (CO), carbon dioxide (CO 2 ), ethane, water (H 2 O), and solid powder particles, the temperature is 550-600°C and the pressure is 2.0-2.4MPa, and the flow rate is 5000Nm 3 / h, after cooling and heat exchange to 40-60 ° C and removing solid particles through two-stage filtration, enter the next process, that is, the hydrogen extraction system. The hydrogen extraction system in this embodiment adopts pressure swing adsorption (PSA) hydrogen extraction .

[0038] (2) Pressure sw...

Embodiment 2

[0043] The difference between this embodiment and Embodiment 1 is that in the described pressure swing adsorption purification process, the switching time of the regulating valve and the program control valve connected to the inlet and outlet pipelines of the adsorption tower in the adsorption state are adjusted according to the sequence arrangement. The length of the adsorption time can be adjusted by the switch degree, and the adjustment of the "hydrogen-carbon concentration ratio" can be realized, and the adsorption time can be reduced to 150-180 seconds. It is 1:3.

Embodiment 3

[0045] The difference between this embodiment and Embodiment 1 is that in the described pressure swing adsorption (PSA) hydrogen extraction process, the regulating valves, The switching time and switching degree of the program control valve, and the operating mode are used to adjust the outflow ratio of the pressure equalization gas, and the 6-2-2V / P operating mode is changed to the 6-1-2V / P mode, that is, the original two adsorption towers are changed to 1 adsorption tower is adsorbed, and the number of times of pressure equalization is still 2 times, and the adsorption time of each adsorption tower is constant, and the time of desorption regeneration is extended to be 1.2~1.4 times of original, realizes the hydrocarbon flow ratio 1 by original embodiment 1: 2 is adjusted to 1:3, and the ratio of carbon to hydrogen concentration remains at 1:5.

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Abstract

The invention discloses a hydrogen extraction method capable of adjusting the hydrogen-carbon ratio of natural gas direct cracking circulation reaction gas. Reaction mixed gas obtained by methane catalytic thermal cracking hydrogen production is adopted as raw material gas, and the method includes pretreating the raw material gas, introducing the pretreated raw material gas into a hydrogen extraction system to obtain a hydrogen product and circulation reaction gas. When the hydrogen extraction system is a PSA hydrogen extraction system, the hydrogen-carbon flow ratio and the hydrogen-carbon concentration ratio are adjusted by adjusting the adsorption time and adjusting the pressure equalizing frequency; when the hydrogen extraction system is an osmotic membrane separation hydrogen extraction system, the hydrogen-carbon flow ratio is adjusted by adjusting the flow rate of the adjusting valve on the non-osmotic side and the osmotic membrane, and the hydrogen-carbon concentration ratio isachieved through several stages of osmotic membranes. According to the process, the hydrogen-carbon flow ratio and the hydrogen-carbon concentration ratio of the circulating reaction gas can be adjusted according to the reaction conditions of the methane catalytic direct cracking hydrogen production reactor so as to meet the reaction requirements, and the problems of high methane conversion rate,high utilization rate and high hydrogen yield and selectivity in the natural gas direct cracking hydrogen production process are solved.

Description

technical field [0001] The invention relates to the technical field of preparing hydrogen from natural gas, in particular to a hydrogen extraction method capable of adjusting the hydrogen-to-carbon ratio of natural gas direct cracking cycle reaction gas. Background technique [0002] The existing natural gas or methane hydrogen production technology is relatively common and mature, including the main hydrogen production by steam reforming of natural gas, and the production of carbon products such as carbon black by natural gas plasma method. 2 Wait. [0003] The typical hydrogen production technology with hydrogen as the main product is natural gas steam reforming (SMR), which has been widely used at home and abroad. However, it needs two reaction steps of reforming reaction and shift reaction, the catalysts used are two different types of catalysts, the energy consumption is high, the process flow is long, and a large amount of greenhouse gas CO is produced by-product. 2 ...

Claims

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Application Information

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IPC IPC(8): C01B3/26C01B3/30C01B3/50
CPCC01B3/26C01B3/30C01B3/50C01B2203/0405C01B2203/042C01B2203/043C01B2203/047C01B2203/0475C01B2203/0495C01B2203/0827C01B2203/1023C01B2203/1052C01B2203/1082C01B2203/1094C01B2203/1241C01B2203/146C01B2203/148C01B2203/1628C01B2203/169
Inventor 汪兰海陈运刘开莉钟雨明蔡跃明蒋强
Owner SICHUAN TECHAIRS
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