Methanol-water steam reforming and hydrogen separation integrated low-pressure hydrogen production system and method thereof

Abstract

The invention relates to a methanol-water steam reforming and hydrogen separation integrated low-pressure hydrogen production system. The system comprises a reforming separation device, a three-phaseheat exchange device, an air compressor, a steam trap, a refrigerating machine, a carbon dioxide separation device and a water gas reforming device; and the pressure controlled by the air compressor is 5-30 MPa, and the temperature controlled by the refrigerating machine is -35-30.8 DEG C. A methanol-water low-pressure hydrogen production method comprises the following steps: methanol-water steamis decomposed to form a mixed gas of hydrogen, carbon dioxide and carbon monoxide, and the hydrogen mixed residual gas is fed into the water gas reforming device and is reformed to make a ratio of hydrogen to carbon dioxide to carbon monoxide in the reformed mixed gas close to a ratio of hydrogen to carbon dioxide to carbon monoxide in the mixed gas of hydrogen, carbon dioxide and carbon monoxide;and the mixed gas is fed into the reaction cavity again, and undergoes hydrogen separation operation. The gas in the system is circularly purified, the theoretical yield can reach 100%, and the hydrogen yield is greater than or equal to 95%.

Description

technical field [0001] The invention relates to a low-compressed hydrogen system integrated with methanol steam reforming and hydrogen separation and a method thereof. Background technique [0002] Hydrogen energy is the most ideal energy source in the 21st century. As a fuel for automobiles, it is easy to start at low temperature, and has little corrosion effect on the engine, which can prolong the service life of the engine. Because hydrogen and air can be mixed evenly, the carburetor used in general cars can be completely omitted, thereby simplifying the structure of existing cars. Even more interesting, just add 4% hydrogen to gasoline. Using it as a vehicle engine fuel can save fuel by 40%, and there is no need to make much improvement to the gasoline engine. Hydrogen fuel cell as power generation system. [0003] No pollution, the fuel cell has no pollution to the environment. It uses electrochemical reaction instead of combustion (gasoline, diesel) or energy stora...

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Problems solved by technology

[0009] At the same time, it also provides a low-pressure hydrogen method to solve the problem that the current hydrogen production process is complicated and cannot achieve circular hydrogen production.

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