Reaction device and method for hydrogen production by methane steam reforming

A technology for producing hydrogen from methane water vapor and reforming, which is applied in chemical instruments and methods, hydrogen, and bulk chemical production, etc., can solve the problem that the contact reaction between methane and water vapor and the catalyst cannot be guaranteed, and the methane conversion rate and product yield are affected. , reduce the adsorption efficiency of the adsorbent, etc., to achieve the effect of simple structure, low cost, and improved utilization.

Active Publication Date: 2017-03-22
SINOPEC ENG GRP CO LTD
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  • Abstract
  • Description
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Problems solved by technology

The problem is that the large particle size adsorbent (referring to the adsorbent with a particle size higher than the average particle size) will slide or stay in the fluidized bed reactor, which will reduce the adsorption efficiency of the adsorbent and affect the methane conversion rate and product yield
However, in this method, due to the low porosity of the foam metal plate, sufficient contact reaction between methane and water vapor and the catalyst cannot be guaranteed, and the conversion rate of methane is relatively low.
The catalyst is coated on the metal foam plate, the preparation process is more complicated, the production cost is high, and it is difficult to replace the catalyst after it is deactivated

Method used

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  • Reaction device and method for hydrogen production by methane steam reforming

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Effect test

Embodiment 1

[0064] use figure 1 The reaction device shown is for steam reforming of methane to produce hydrogen, wherein:

[0065] The inner diameter of the reactor 1 is 100 mm, and the height e of the reactor 1 is 1.5 m (the height e does not include the height of the bottom head). The inner diameter of the cylindrical shell of the settler 6 is 300 mm, the height c of the shell of the settler 6 is 2.0 m, and the height d of the inverted truncated conical shell of the settler 6 is 0.8 m. The inner diameter of the cylindrical body of the regenerator 4 is 300 mm, the height a of the regenerator 4 body is 2.0 m, and the height b of the inverted truncated conical body of the regenerator 4 is 0.8 m. The feed distributor 7, lifting gas distributor 10, and regeneration gas distributor 17 are conventional dendritic gas distributors with a pore diameter of 1.5 mm and an opening ratio of 30%. The cross-sectional shapes of the inclined pipe 2 to be born, the conveying pipe 3 of the adsorbent to be...

Embodiment 2

[0072] Adopt the device and the method of the adsorption-enhanced methane steam reforming hydrogen production reaction identical with embodiment 1, difference is:

[0073] The particle size of the nickel-based catalyst is 1000 μm, the particle size of the carbon dioxide adsorbent is 70 μm, the molar ratio of methane and water vapor is 1:3, the top temperature of the reactor is 600°C, the bottom temperature is 550°C, and the gas The linear velocity is 0.4m / s, the regeneration temperature of the regenerator is 800°C, the top pressure is normal pressure, the regeneration time is 15min, the gas linear velocity in the dilute phase section of the regenerator is 0.5m / s, and the top pressure of the settler is 0.3MPa , the average temperature of the dense-phase adsorbent bed in the settler is 620°C, and the gas linear velocity in the dilute-phase section is 0.3m / s.

[0074] After carrying out the above reaction, analyze the gas product composition of the gas outlet pipe at the top of t...

Embodiment 3

[0076] Adopt the device and the method of the adsorption-enhanced methane steam reforming hydrogen production reaction identical with embodiment 1, difference is:

[0077] The particle size of the nickel-based catalyst is 1000 μm, the particle size of the carbon dioxide adsorbent is 70 μm, the molar ratio of methane and water vapor is 1:4, the top temperature of the reactor is 640°C, the bottom temperature is 590°C, and the gas linear velocity is 0.3 m / s, the regeneration temperature of the regenerator is 850°C, the top pressure is normal pressure, the regeneration time is 15min, the gas linear velocity in the dilute phase section of the regenerator is 0.4m / s, the top pressure of the settler is 0.3MPa, and the inner density of the settler is The average temperature of the phase adsorbent bed is 660°C, and the gas linear velocity in the dilute phase section is 0.25m / s.

[0078] After the above reaction was carried out, the gas product composition of the gas outlet pipe at the t...

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Abstract

The invention provides a reaction device and a method for hydrogen production by methane steam reforming. The reaction device for hydrogen production by methane steam reforming is simple in structure, an adsorbent is regenerated regularly, a catalyst with the longer service life is not required to be frequently regenerated along with the adsorbent, and the energy consumption during regeneration is reduced and the reduction of the activity of the catalyst is avoided while the adsorption of the adsorbent can always meet the use requirement. A raw material flowing upwards makes countercurrent contact with the adsorbent lowing downwards, and the large-particle-size and high-density adsorbent cannot slide or be retained in a reactor and can be discharged from the bottom of the reactor timely and quickly; the raw material and the fixed catalyst can be fully contacted and react, produced CO2 is adsorbed by the adsorbent immediately, the chemical balance limitation is broken through, and the methane conversion rate is increased. The purity of obtained hydrogen is high, the hydrogen production efficiency is high, the cost is low, and the continuous, efficient and stable hydrogen production process can be realized.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a hydrogen production reaction device and method for steam reforming of methane. Background technique [0002] Hydrogen is an important chemical raw material, widely used in chemical industry, metallurgy and aerospace and other fields. As a clean, efficient, safe and sustainable energy, hydrogen energy is regarded as the clean energy with the most development potential in this century, and is also regarded as an effective alternative energy to solve the greenhouse effect and improve energy utilization. [0003] Hydrogen production by steam reforming of methane has been used for the first time in 1926. After nearly a hundred years of continuous development, it has become the most widely used method for hydrogen production from natural gas in industry. The traditional steam reforming of methane to produce hydrogen includes: preheating and pretreatment of raw materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/38
CPCC01B3/38C01B2203/0233C01B2203/1058C01B2203/1241Y02P20/52Y02P20/584
Inventor 王宝石郝代军宋业恒王文柯王明党郑红霞岳建伟郭巧玲吴辰捷席清波唐娉玺
Owner SINOPEC ENG GRP CO LTD
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