Adsorption reinforced methane steam reforming hydrogen production process and apparatus using circulating fluidized bed

Abstract

The invention discloses a hydrogen preparing process of strengthening methane steam reforming by cyclic fluidized bed adsorption, comprising: transporting 5-200 micron composite catalyst grains into a regenerator for pretreating; degasifying the pretreated composite catalyst and tranfering it to a fluidized bed reactor for reducing; charing methane and steam into the fluidized bed reactor in the water-carbon ratio of 2-10, and making the fluidized composite catalyst perform reforming hydrogen preparing reaction with methane and steam at the same time, and finally transferring the composite catalyst into regnerator to be regenerated and recycled, where the reacting time is 1s-5min, the reacting gas speed is 0.3-1.0m / s, and the ratio of composite catalyst to methane is 10 : 1-0.002 : 1 in g / ml. And it also discloses a device of implementing the above process. And the process can implement stable and continuous operation of fluidized bed reactor, and has advantages of high mass and heat transfer efficiencies.

Description

technical field [0001] The invention relates to an adsorption-enhanced methane steam reforming hydrogen production process, in particular to an adsorption-enhanced methane steam reforming hydrogen production process and a device using a circulating fluidized bed. Background technique [0002] At present, most of the reactors used in domestic and foreign industrial production for hydrogen production by steam reforming of methane are fixed-bed reactors. In order to reduce the reaction pressure drop, a honeycomb-shaped large-particle catalyst with a particle diameter of Φ15-20×10-15mm and nickel oxide as the active component is generally used. The fixed-bed methane steam reforming hydrogen production reaction requires a high-temperature two-stage conversion reaction at 600-1000 ° C. The CO by-product of the conversion reaction needs to be converted into CO by using a shift catalyst at 300-500 ° C. 2 , the final equilibrium CO 2 The gas phase content is 15-20%, and the hydroge...

AI Technical Summary

Problems solved by technology

The problems in the catalyst are that due to the large catalyst particles, there is a gradient in internal heat transfer; the catalyst life is short, and the reactor needs to be filled with a large diameter, which affects the heat supply and reaction performance of the reaction bed, resulting in low production capacity of the reactor.

In the whole process, there are disadvantages such as high reaction temperature, low hydrogen concentration, long reaction process, large equipment investment, etc., and there is always the problem of high energy consumption in hydrogen production process reaction and purification

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