Method, device and reaction system for hydrocarbon preparation by light hydrocarbon steam reforming

Abstract

The invention provides a method, a device and a reaction system for hydrocarbon preparation by light hydrocarbon steam reforming. The method includes: (1) making light hydrocarbon and steam enter a fluidized reactor, contacting them with a magnetic steam reforming catalyst and a nonmagnetic adsorption catalyst to undergo a reaction under steam reforming conditions so as to generate H2, CO and CO2, with the CO2 absorbed by the adsorption catalyst; (2) subjecting the product gas and a mixed catalyst to gas-solid separation at the top of a fluidized bed reactor, letting the separated product gas enter a subsequent separation and purification apparatus so as to obtain high purity hydrogen; and (3) making the mixed catalyst enter a magnetic separator through a catalyst outlet of the fluidized reactor to undergo magnetic separation, returning the separated magnetic steam reforming catalyst to the fluidized reactor to achieve cycle use, and subjecting the separated nonmagnetic adsorption catalyst to burning regeneration and then returning it to the fluidized reactor to achieve cycle use. The method provided in the invention omits the processes of frequent high-temperature oxidation of active components in the steam reforming catalyst and reduction after oxidation, simplifies the process and reduces the energy consumption of the system.

Description

technical field [0001] The invention relates to a method for catalytic conversion of petroleum hydrocarbons, more specifically, to a method for producing hydrogen by steam reforming of light hydrocarbons. Background technique [0002] The production of clean fuels will inevitably increase the demand for hydrogen. Hydrogen products obtained from various minerals including coal, oil and natural gas as raw materials are the main sources of hydrogen. Among them, the most mature and commonly used ones are still hydrocarbons. Steam reforming hydrogen production process, 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) of. Hydrogen production by steam reforming of natural gas mostly uses fixed-bed reactors. In order to reduce the pressure drop of the reactor, the catalyst generally adopts a...

AI Technical Summary

Problems solved by technology

[0007] 1) Due to the use of a composite catalyst, Ni, which is the active component of methane steam reforming, is reduced and oxidized in the reactor and regenerator cycle during the circulating fluidization process, and the catalyst is frequently burned and regenerated at high temperature, which may easily cause the catalyst to grow due to Ni grains However, it destroys its high dispersion, and even leads to the sintering deactivation of Ni active components, which affects the activity and stability of the catalyst, making it difficult for the device to operate stably.

[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

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