A hydrogen separator with an expansion joint

Abstract

A hydrogen separator with an expansion joint, the separator includes a cavity, a conical seal, a compression ring, a sealing material and a metal shrapnel; an expansion joint is set in the middle of the cavity, and a conical seal is set at both ends of the cavity The lock nut matched with the parts; the sealing chamber and the expanding tube type gas buffer chamber are arranged in the conical sealing part, and the inclined plane is set at the bottom of the sealing chamber; one end of the tubular hydrogen separation material is inserted into the sealing chamber of the conical sealing part, An annular gap is defined between the sealing cavity and the hydrogen separation material, and the sealing material is filled in the annular gap; the tubular hydrogen separation material is located on the axis of the conical seal, and the conical seal is connected by the sealing material, the compression ring and the metal shrapnel The tubular hydrogen separation material is screwed with the lock nuts at both ends of the cavity to encapsulate the tubular hydrogen separation material in the cavity. The invention solves the tension problem caused by the difference in thermal expansion coefficient between the tubular hydrogen separation material and the stainless steel separator cavity in the process of high temperature or temperature rise and fall, eliminates the damage of thermal expansion to the sealing performance during high temperature use, and maintains the sealing performance of stability.

Description

technical field [0001] The invention relates to a hydrogen separator with an expansion joint. Specifically, a tubular ceramic-based hydrogen separation material is sheathed in a cavity with an expansion joint, and the two ends of the tubular ceramic-based hydrogen separation material are respectively sheathed with metal shrapnel, pressed Tight ring, graphite gasket; two conical seals are screwed together to encapsulate the tubular ceramic-based hydrogen separation material in the chamber to form a hydrogen separator. The separator has tubular hydrogen separation materials that are easy to replace, simple in structure, and easy to operate. , cost saving and other advantages, especially suitable for small and medium 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 ...

AI Technical Summary

Problems solved by technology

However, the thermal expansion coefficient of ceramic materials is low, and the thermal expansion coefficient at 25-700 ° C is about 7 to 8×10 -6 K -1 (Handbook of Electrical and Electronic Insulation Technology, Machinery Industry Press, 2008, P482); the thermal expansion coefficient of stainless steel at 25-700 °C is 18.6×10 -6 K -1 (Handbook of Metal Materials, Chemical Industry Press, 2009), the thermal expansion coefficients of the two are very different. When the ceramic material and stainless steel are directly sealed by mechanical connection, the problem of thermal expansion mismatch will inevitably occur in the process of high temperature or temperature rise and fall.

[0005] In order to slow down the difference in thermal expansion caused by ceramic pipe fittings and metal seals when used at high temperatures, various methods have been proposed, such as: Huang et al. , 01, 2006) adopt ferrule sealing method to seal both ends of the ceramic material respectively, and then connect one end to the sealer, and the other end is free to expand and contract. This method can eliminate the difference in thermal expansion, but the structure is not compact enough and needs three times. Sealed connection increases the chance of gas leakage; Xu et al. (Xu Hengyong, Li Chunlin, Tang Chunhua, a multi-channel metal palladium or palladium alloy composite membrane hydrogen separator, Chinese patent CN101642684A, 02.2010; Xu Hengyong, Tang Chunhua, set preheating and heat exchange An integrated multi-channel metal-palladium composite membrane hydrogen separation device, Chinese utility model patent, CN203379783U, 01.2014) is connected to one end of the palladium membrane assembly by using a metal elbow, etc., and then the palladium membrane assembly is sealed in the separator cavity by welding , through the expansion and contraction of metal elbows, etc., the stress generated by the thermal expansion of the palladium / ceramic composite membrane tube and the metal seal is effectively buffered. The structure of the separator ensures the airtightness of the interface, but it also leads to the relatively / The problem that the ceramic composite membrane is not easy to replace, and the separator cavity cannot be used repeatedly

Huang et al. (Huang Yan, Zha Qinlai, Hu Xiaojuan. A high-temperature sealer for ceramic pipe fittings, Chinese invention patent, CN102979981A, 03.2013) used a constant expansion alloy material with a thermal expansion coefficient close to that of ceramic materials to manufacture the sealer cavity, combined with a clamp The sleeve method is used to seal the ceramic pipe fittings, which effectively solves the problem of thermal expansion stress generated between the ceramic seal cavities in high temperature or frequent temperature rise and fall environments, but because of the high cost of constant expansion alloy materials, this will inevitably lead to increase in manufacturing costs

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