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Method for producing hydrogen through fluidized-bed methane steam reforming

A technology for producing hydrogen from methane steam and reforming, which is applied in chemical instruments and methods, hydrogen, chemical recovery, etc., can solve problems such as different operating rules, simplify the process, reduce system energy consumption, and avoid oxidation and sintering deactivation. Effect

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In the long-term research process, the inventor found that catalysts with different particle size distributions or different densities operate differently in the reactor, so a new method was proposed to solve the shortcomings of the steam methane reforming process in the prior art

Method used

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  • Method for producing hydrogen through fluidized-bed methane steam reforming
  • Method for producing hydrogen through fluidized-bed methane steam reforming
  • Method for producing hydrogen through fluidized-bed methane steam reforming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1 illustrates the effect of using the method provided by the present invention to enhance hydrogen production by steam reforming of methane.

[0072] Reforming catalyst preparation:

[0073] Pseudoboehmite, kaolin, nickel nitrate aqueous solution and decationized water are mixed and beaten according to the proportion, hydrochloric acid is added to adjust the pH value, the obtained colloid is spray-dried and formed into particles with a size of 90-130 microns, and then roasted at 550 ° C for 2 hours to obtain The microspherical carrier has a NiO content of 37wt%, a kaolin content of 33wt%, and an alumina content of 30wt% after sintering. After calcination, the reforming catalyst is reduced at 350°C in a hydrogen atmosphere to reduce nickel oxide to metal Ni, which is designated as ReAT-1. ReAT-1 has an average particle size of 110 microns and a bulk density of 1.0kg / cm3.

[0074] Adsorption catalyst preparation:

[0075] 5.6Kg of decationized water, 2.0kg of pse...

Embodiment 2

[0078] Example 2 illustrates the effect of using the method provided by the present invention to enhance hydrogen production by steam reforming of methane.

[0079] The reaction device used, the adsorption catalyst used, the reforming catalyst, and the specific steps are the same as in Example 1. The difference is that in the reaction operating conditions, the raw material gas-water-carbon ratio is 4, the reaction temperature is 650 ° C, and the reaction pressure is 0.1 MPa, the regenerator temperature is 700°C, the stripper gas linear velocity is 0.8m / s, and the feed gas flow rate is 4.5m / s. The experimental results are shown in Table 1.

Embodiment 3

[0081] Example 3 illustrates the effect of using the method provided by the present invention to enhance hydrogen production by steam reforming of methane.

[0082] The reaction device used, the adsorption catalyst used, the reforming catalyst, and the specific steps are the same as in Example 1. The difference is that in the reaction operating conditions, the raw material gas-water-carbon ratio is 8, the reaction temperature is 700 ° C, and the reaction pressure is 0.5 MPa, the regenerator temperature is 750°C, and the stripper gas line velocity is 1.1m / s. The experimental results are shown in Table 1.

[0083] Table 1

[0084] example

[0085] As can be seen from Table 1, the method for hydrogen production by steam reforming of methane provided by the present invention not only simplifies the flow process, but also has higher hydrogen content in the obtained hydrogen product, and CO and CO 2 The content is lower. By adopting the method provided by the invention,...

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Abstract

The invention discloses a method for producing hydrogen through fluidized-bed methane steam reforming, comprising steps of: regenerating an adsorption catalyst with low bulk density at a regenerator by high-temperature decomposition, wherein the regenerated adsorption catalyst is mixed with a reforming catalyst with high bulk density delivered by outer circulation at the bottom of a reactor; injecting methane and steam into the bottom of the reactor, wherein the methane and the steam contact with the reforming catalyst to generate H2 and CO2 by reaction, and the CO2 reacts with CaO in the adsorption catalyst to impel the reaction to perform towards the direction of generating H2; settling a separation area at the upper part of the reactor through the upward motion of the reaction gases and the catalysts, wherein the reforming catalyst with large particles or high bulk density stays at the bottom area of a steam stripper and are delivered to the reactor through an outer circulation pipe for re-participating in reaction, and the adsorption catalyst with small particles or low bulk density stays at the upper part of the steam stripper; and repeatedly using the regenerated adsorption catalyst after steam stripping. According to the method provided by the invention, the process of reducing NiO into metal Ni in a reducer after the reforming active element Ni is oxidized into NiO in the regenerator is saved, therefore, the technical process is simplified, and the system energy consumption is reduced.

Description

technical field [0001] The invention relates to a method for hydrogen production by steam reforming of fluidized bed methane, specifically, a method for producing hydrogen through reforming reaction and chemical adsorption of CO using two catalysts with different particle size distributions or different densities. 2 To strengthen the steam reforming reaction of methane to produce hydrogen. Background technique [0002] Hydrogen is not only an important raw material gas for oil refining, chemical industry, metallurgy and other industries, but also a recognized future energy carrier. Natural gas steam reforming (SteamMethaneReforming, SME) is currently the method with the lowest cost and the largest amount of hydrogen production in hydrogen production. About 1 / 2 of hydrogen is produced by natural gas steam reforming (SRM). Hydrogen production by steam reforming of methane mostly uses fixed-bed reactors. In order to reduce the pressure drop of the reactor, the catalyst general...

Claims

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Application Information

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IPC IPC(8): C01B3/34
CPCY02P20/584
Inventor 武雪峰侯栓弟许友好汪燮卿张占柱赵俊杰张同旺
Owner CHINA PETROLEUM & CHEM CORP