Device and method for catalytic hydrogen preparation from methane and carbon dioxide

Abstract

The invention discloses a device and a method for catalytic hydrogen preparation from methane and carbon dioxide, and belongs to the technical field of chemical industry. The method mainly comprises the following two steps: (1) reforming methane and carbon dioxide in a synthetic gas generation section to generate a synthetic gas; and (2) performing reaction on water vapor and the synthetic gas in the step (1) in a section for water gas conversion and hydrogen separation, and separating hydrogen by virtue of a hydrogen membrane separation component. Raw materials of the method disclosed by the invention are wide in source and low in price, which is of great significance for energy conservation and emission reduction; moreover, the preparation process is simple, the equipment investment is low, the membrane separation performance is good, and the hydrogen yield is high; and the device and the method are suitable for fields of petroleum, chemical industry and fuel batteries.

Description

technical field [0001] The invention relates to a methane carbon dioxide catalytic hydrogen production device and method, in particular to a catalytic reforming and membrane separation hydrogen production device and a method thereof, belonging to the technical field of chemical industry. Background technique [0002] As a secondary energy source, hydrogen energy is widely used in industries such as metallurgy, aerospace, oil refining, and ammonia synthesis. Moreover, hydrogen energy, as a truly clean and sustainable energy, will have an important impact on environmental protection, sustainable energy development, and pollution reduction. At present, the preparation of hydrogen energy is mainly divided into two categories, one is hydrogen production by reforming natural gas and steam, and the other is hydrogen production by electrolysis using water as raw material. But these two types of methods need to consume a lot of energy and emit a lot of greenhouse gases. The use of ...

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Problems solved by technology

This device can well meet the small-scale use of hydrogen, but the CO2 in the tail gas is not reused, and it will have an impact on the environment if it is discharged into the air

[0007] Patent CN101837955A discloses a hydrogen production method and its device by coupling catalytic reforming and membrane separation reaction. The main structure includes a feed gas inlet, a pre-distribution chamber, a gas distribution plate, a palladium membrane module, a catalyst bed, a sampling port, and a fluidized bed. Reaction zone bed body, metal connecting pipe, heating system, hydrogen conduit, expansion section, ultra-pure hydrogen outlet, vacuum pump, back pressure valve, liquid rotameter, water pump, tail gas outlet, heat exchanger, gas rotameter, gas pump And preheater, etc., this device uses a membrane separation device to separate hydrogen, but the temperature of the membrane reaction zone is too high, which is relatively harmful to the membrane, and the process uses methane steam reforming, which consumes a lot of energy

[0008] To sum up, it can be seen that under the existing technology, hydrogen production through steam reforming of methane consumes a lot of energy, and the tail gas generated is difficult to handle

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