A palladium membrane module integrating electric heating and hydrogen separation

Abstract

The invention discloses a palladium membrane assembly integrating electric heating and hydrogen separation. The assembly includes an electric heating module and a hydrogen separation module, and a graphite gasket is installed between the electric heating module and the hydrogen separation module; the electric heating module is supported by frame, porous sintered metal sheets, electric heating tubes and partitions; the hydrogen separation module is composed of supporting frames, palladium and palladium alloy membranes, flexible porous ceramic sheets and porous sintered metal supports; the invention directly introduces hydrogen-containing raw gas into palladium Membrane module, after being preheated by the heating module, high-purity hydrogen is obtained through palladium membrane separation. The palladium membrane module introduces a flexible porous ceramic intermediate layer between the palladium and palladium alloy membrane and the porous sintered metal support body, which can avoid the support body when used at high temperature. The metal components in the metal migrate to the surface of the palladium membrane, which will lead to the risk of reducing the selective permeability of the palladium membrane to hydrogen. It has a compact structure, fast heating rate, and good temperature control effect, and is especially suitable for small-scale hydrogen separation and purification.

Description

technical field [0001] The invention relates to a palladium membrane module with compact structure, fast heating rate, good preheating effect, and avoiding the risk of metal components in the support migrating to the surface of the palladium membrane when used at high temperature. The module collects electricity for heating and hydrogen separation In one, it is especially suitable for small-scale hydrogen separation and purification. Background technique [0002] With the rapid development of industries such as electronic information, semiconductor and LED manufacturing, the demand for ultra-pure hydrogen (purity>99.9999%) is increasing (Chen Zili et al., Source and purification of hydrogen in polysilicon production, low temperature and special gas ,30(2012)21-23), and put forward higher requirements for hydrogen separation and purification technology. Palladium and its alloy membranes are favored in hydrogen separation and purification applications due to their unique s...

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Problems solved by technology

At present, the heating methods of the palladium membrane separator and raw hydrogen mainly include electric heating (integrated in the palladium membrane module), thermal fluid heating or heating of auxiliary components, etc. Hydrogen Membrane Separation Device" (application number: 200810218798.1) discloses a palladium membrane separation device, which includes a blind flange, a palladium membrane module, a synthetic gas circulation frame, a sealing graphite gasket and fastening bolts, etc., wherein Electric heating wires are installed in the four-wall grooves of the synthesis gas circulation frame, which are used for heating and constant temperature of the device. This method has a relatively fast heating rate and can perform good temperature control. After the introduction tube is introduced into the device, it directly contacts the palladium membrane, which may cause a large temperature difference on the surface of the palladium membrane, which in turn affects the service life of the palladium membrane; No.: 200710031743.5) and "A Palladium Membrane Module Containing Ceramic Thermal Insulation Layer and Utilizing Small-Scale Channels for Heat Exchange" (Application No.: 200810029464.X) both involve adding micro-scale heating channels to the palladium membrane module, using thermal fluid to The flow and heat transfer in the micro-scale channel will quickly heat up the palladium membrane module and keep the temperature constant. This method has a relatively fast heating rate, and can perform good temperature control and save materials. difficulty

[0010] The structure of the palladium membrane module in Chinese invention patents (200810218798.1, 200710031743.5, 200810029464.X) is that the palladium alloy membrane is in direct contact with the porous sintered metal support. When used at high temperature, the metal components in the support migrate to the surface of the palladium membrane and affect Risks of Permselective Properties of Palladium Membranes for Hydrogen

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