Methanol reforming hydrogen production system and process

Abstract

The present invention discloses a methanol reforming hydrogen production system, which comprises: a reforming reaction unit, which comprises a raw material tank for mixing desalted water and methanol,a reforming reactor communicated with the outlet of the raw material tank, a temperature adjusting unit arranged between the raw material tank and the reforming reactor, a hydrogen purification unitcomprising a palladium membrane purification device arranged at the downstream of the reforming reactor and used for purifying the hydrogen-rich gas after the reforming reaction, and a palladium membrane purification device provided with a purified hydrogen outlet and a residual gas outlet, and a combustion unit provided with a feeding port and a tail gas outlet, wherein the feeding port is connected with the residual gas outlet of the palladium membrane purification device, the tail gas outlet is communicated with the temperature adjusting unit, and the reaction temperature in the reforming reactor is controlled not to exceed the purification temperature interval of the palladium membrane purification device. According to the system, a methanol reforming hydrogen production process can also be provided. The system and process are compact in structure, simple in process, high in energy utilization rate and high in purity of purified hydrogen.

Description

technical field [0001] The invention belongs to the technical field of methanol reforming hydrogen production, and relates to a methanol reforming hydrogen production system and process. Background technique [0002] A fuel cell is an efficient, green and quiet power generation device. Due to its advantages of high energy density, water as the main discharge, few moving parts, and flexible assembly, it is especially suitable for vehicle power, marine power, distributed power plants, aerospace, etc. [0003] As the fuel of fuel cells, hydrogen has low density, flammability and explosion, etc., resulting in low hydrogen storage density and poor safety, which seriously affects the technical application and promotion of fuel cells. Methanol reforming hydrogen production mainly uses methanol and water to undergo reforming reaction at a certain temperature to generate hydrogen-rich gas, which is purified and made into high-purity hydrogen. The tail gas can provide heat for the re...

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Problems solved by technology

[0005] Chinese patent document CN102874754B discloses a system and method for producing hydrogen by using methanol water, wherein since the temperature of the reforming reactor is lower than that of the separation chamber, a preheating temperature control mechanism is added between the reforming reactor and the separation chamber , this design not only increases the complexity of the system, but also increases the requirements for thermal management of the system

[0006] Chinese patent document CN105720285A discloses a closed fuel cell hydrogen source system, which uses CO selective oxidation to remove CO after the reforming reaction, reduces the concentration of CO to below 10ppm, and then passes the hydrogen-rich gas into the steam-water separator , to remove trace methanol and water vapor, and then pass the hydrogen-rich gas into the fuel cell. At this time, the hydrogen-rich gas is mainly hydrogen and CO 2 , where CO 2 Accounted for about 25%, resulting in a greatly reduced calorific value of the fuel, thereby reducing the energy density of the fuel cell

[0007] Chinese patent document CN104276542B discloses a reformer of a methanol-water hydrogen production system, which provides a starting device for the reforming reactor, and specifically adopts open flame combustion to gasify methanol and hydrogen to provide heat to the reforming reactor, but methanol Both hydrogen and hydrogen are flammable and explosive chemicals, and there is a certain risk of explosion when exposed to open flames

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