Method and apparatus for producing hydrogen from hydrogen-containing synthesis gas using palladium membrane

A synthesis gas, high-purity technology, applied in the direction of hydrogen separation, etc., can solve the problems of ineffective use of heat energy, lower separation efficiency of palladium membrane, high water vapor content, etc., and achieve the effect of improving energy utilization efficiency, simple design and high efficiency

Inactive Publication Date: 2009-02-25
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

There are two problems in this process. One is that the water vapor content in the mixed gas is high, which reduces the separation efficiency of the palladium membrane.
Second, the heat energy cannot be effectively utilized and the energy consumption is high

Method used

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  • Method and apparatus for producing hydrogen from hydrogen-containing synthesis gas using palladium membrane
  • Method and apparatus for producing hydrogen from hydrogen-containing synthesis gas using palladium membrane
  • Method and apparatus for producing hydrogen from hydrogen-containing synthesis gas using palladium membrane

Examples

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Embodiment

[0026] Example: Separation and purification of hydrogen in kilowatt-level fuel cell hydrogen supply system

[0027] The hydrogen source of the proton exchange membrane fuel cell requires high purity hydrogen, especially for the content of CO. Pure hydrogen with impurities at the ppb level can be obtained by palladium membrane separation, and the palladium membrane separation volume is small, which is suitable for application Small home fuel cell power station.

[0028] Synthesis gas is produced by steam reforming of natural gas, and the reactor can be a conventional fixed-bed reactor, a new fluidized-bed reactor, a microchannel reactor, etc. The syngas composition is the composition of the gas when the reaction reaches equilibrium. The reaction raw gas flow rate is as follows: natural gas (according to methane): 0.280kg / h, water vapor: 0.944kg / h, reaction temperature: 700°C; reaction pressure: 1.1MPa; then its outlet (P01) synthesis gas molar composition is as follows : CH4:...

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Abstract

The invention relates to a method which adopts a palladium membrane to produce high-purity hydrogen from hydrogen-containing synthetic gas and a device. In the method, synthetic gas which contains water vapor and hydrogen and is produced by an upstream hydrogen making reactor is firstly sent to a cooler, the cooled synthetic gas enters a gas-liquid separator, after dehydration, the synthetic gas enters a primary heater and is heated in the heater, the heated synthetic gas enters a secondary heater and heated to the temperature of 450-600 DEG C, the heated synthetic gas enters a palladium membrane separator, and most of hydrogen in the synthetic gas permeates the palladium membrane separator to become the high-purity finished hydrogen. A pipeline of the device which connects a heat exchanger and the palladium membrane separator is sequentially provided with the gas-liquid separator, the primary heater and the secondary heater, the palladium membrane separator is connected with a burner by the primary heater, and the burner is also connected with the secondary heater. The invention has simple design and high hydrogen separation efficiency of the palladium membrane and provides a new technical method for efficient production of high-purity hydrogen.

Description

Technical field: [0001] The invention relates to a process for producing high-purity hydrogen from hydrogen-containing synthesis gas, in particular to a method and device for preparing high-purity hydrogen by using palladium membrane separation. Background technique [0002] At present, 90% of the hydrogen in the world comes from the reforming of hydrocarbons (natural gas, coal, biomass, etc.), purification after chemical processes such as gasification or cracking, and the purification of synthesis gas is one of the key processes. Available purification techniques include: pressure swing adsorption, polymer membrane separation, palladium membrane separation, low temperature separation, etc. Compared with other separation technologies, palladium membrane separation can produce high-purity hydrogen containing only ppb-level impurities, which is especially suitable for fuel cells; in addition, the palladium membrane separation device occupies a small area and is easier to minia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50
Inventor 解东来叶根银
Owner SOUTH CHINA UNIV OF TECH
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