A moving bed light hydrocarbon steam reforming hydrogen production method and device

Abstract

The invention relates to a method for hydrogen production by light hydrocarbon steam reforming in a moving bed and a device. The method includes: preheating light hydrocarbon and steam, then leading them into a reactor from the bottom to undergo countercurrent contact with a reforming catalyst and a adsorption catalyst with different particle sizes, making the light hydrocarbon and steam react under steam reforming conditions to generate H2, CO and CO2, with the CO2 reacting with CaO in the adsorption catalyst to convert to CaCO3; subjecting the product gas generated by the reaction to gas-solid separation at the reactor top, then bringing the gas into a subsequent purification separation apparatus so as to obtain high purity hydrogen; letting the mixed catalyst enter a screening separator to undergo separation according to particle size, returning the separated reforming catalyst to the moving bed reactor to realize cycle use, and regenerating the separated adsorption catalyst and returning it to the moving bed reactor to realize cycle use. With the method and the device provided in the invention, the process of reducing NiO into metal Ni in a reducer after frequent high temperature oxidation of the reforming active component Ni into NiO can be omitted, the technological process is simplified, the catalyst service life is prolonged, and the system energy consumption is reduced.

Description

technical field [0001] The present invention relates to a method and device for catalytic conversion of petroleum hydrocarbons, more specifically, to a process method and device for steam reforming of methane to produce hydrogen. Background technique [0002] The production of clean fuels will inevitably lead to an increase in the demand for hydrogen. Although there are many methods for hydrogen production, the hydrogen production technology using various minerals including coal, oil and natural gas as raw materials is still the most important method. Among them, the most mature and commonly used It is still the steam reforming hydrogen production process of hydrocarbons. Natural gas steam reforming (SteamMethaneReforming, SME) is currently the method with the lowest cost and the largest hydrogen production capacity in hydrogen production. About 1 / 2 of the hydrogen is through the natural gas steam reforming method (SRM) prepared. Hydrogen production by steam reforming of me...

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Problems solved by technology

[0007] 1) Due to the use of composite catalysts, Ni, which is the active component of methane steam reforming, is cyclically reduced and oxidized in the reactor and regenerator during the circulating fluidization process, especially the high-temperature regeneration process is likely to cause the sintering of Ni active components and lose live;

[0008] 2) After the reforming active component Ni is oxidized to NiO in the regenerator, it needs to be reduced to metal Ni in the reducer, and the best state is to reduce it at low temperature to avoid the aggregation of Ni metal particles and inactivation, so that It is necessary to lower the temperature of the regenerated catalyst and then carry out the reduction reaction, and the reduced catalyst must be heated up to the reaction temperature, resulting in a large amount of energy consumption

[0010] However, these existing technologies have the defect that the catalyst is frequently burnt and regenerated, which can easily cause the catalyst to destroy its high dispersion due to the growth of Ni grains, affect the activity and stability of the catalyst, and make it difficult for the device to operate stably. How to solve it reasonably Continuous adsorption regeneration of adsorbent in adsorption-enhanced steam reforming is an internationally recognized technical bottleneck in this field

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