Middle-pressure hydrogen production system integrating methanol steam reforming and hydrogen separation and method thereof

Abstract

The invention relates to a middle-pressure hydrogen production system integrating methanol steam reforming and hydrogen separation, including a reforming separation device, a three-phase heat exchangedevice, a steam trap, a refrigerator, a carbon dioxide separation device, and a water gas reforming device. The pump pressure of a liquid pump is 7-18 MPa, and the temperature controlled by the refrigerator is -25 to 18 DEG C. According to a middle-pressure hydrogen production method utilizing methanol water, methanol water vapor is decomposed into a mixed gas of hydrogen, carbon dioxide and carbon monoxide; residual hydrogen mixed gas is conveyed to a water gas reformer for reforming, so that the ratio of hydrogen, carbon dioxide, and carbon monoxide in the reformed mixed gas is close to that of the mixed gas of hydrogen, carbon dioxide and carbon monoxide; the mixed gas is conveyed to a reaction chamber again for hydrogen separation. Cyclic purification for gas in the system is achieved, the theoretical yield can reach 100% and the hydrogen yield of not less than 95% is achieved.

Description

technical field [0001] The invention relates to a system for suppressing hydrogen in an integrated type of 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 en...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide an integrated hydrogen suppression system for methanol steam reforming and hydrogen separation, and to solve the gap between the reformer and the hydrogen separation device in the current hydrogen production system. Due to the split structure, the hydrogen production system is complicated;

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

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