Palladium/palladium alloy membrane purifier and use method thereof

Abstract

The invention discloses a palladium / palladium alloy membrane purifier. The palladium / palladium alloy membrane purifier comprises an outer shell, a heat exchanger, a membrane tube bundle consisting ofa plurality of palladium / palladium alloy membrane tubes in the outer shell, sleeves, a sleeve integrated disc and a membrane tube bundle integrated disc, wherein one end of each palladium / palladium alloy membrane tube is closed, and the other end of each palladium / palladium alloy membrane tube is fixedly connected to the membrane tube bundle integrated disc; and one end of each sleeve is fixedly connected to the sleeve bundle integrated disc, and the other end of each sleeve is inserted outside the corresponding palladium / palladium alloy membrane tube in parallel. A use method of the palladium / palladium alloy membrane purifier comprises the steps of purging, heating of the purifier, preparation of pure hydrogen and the like. The palladium / palladium alloy membrane purifier is wide in application range, high in pressure resistance and high in hydrogen permeation efficiency and energy utilization rate; and the use method has the characteristics of simple process, good reliability, diverseauxiliary heat source sources, wide application field and the like.

Description

technical field [0001] The invention belongs to the technical field of hydrogen purification, and relates to a palladium / palladium alloy membrane purifier and an application method thereof. Background technique [0002] Hydrogen is one of the basic raw materials in the modern chemical industry. In the refining and chemical industry, there is a huge demand for hydrogen in the fields of ammonia synthesis, methanol and hydrogenation in petroleum refining processes. In the metallurgy industry, hydrogen is used as a reducing gas to reduce metal oxides to metals. In high-temperature forging and pressing of some metal equipment, hydrogen is often used as a protective gas to prevent metals from being oxidized. In the optoelectronics and semiconductor industries, high-purity hydrogen is used as a reaction gas, reducing gas or protective gas in the growth of some electronic materials, preparation of substrates, oxidation process, epitaxy process and chemical vapor deposition (CVD) tec...

AI Technical Summary

Problems solved by technology

The traditional rolling method can realize the continuous production of palladium membrane tubes, but its disadvantage is that the yield is low. In addition, in order to maintain a certain mechanical strength of the palladium membrane tubes, the wall thickness and diameter of the membrane tubes are relatively large, which seriously affects the production of palladium membrane tubes. Hydrogen permeation efficiency of palladium membrane tube

[0005] Due to the high compressive strength of support materials such as porous ceramics and porous stainless steel, the film thickness of this type of palladium membrane tube is usually thin (10-50um), and its hydrogen permeation efficiency is also high. Because: on the one hand, when the thinner palladium film layer is deposited on the porous carrier material, it is easy to produce defects such as pinholes and inconsistent film thickness; on the other hand, the adhesion between the palladium or palladium alloy film and the tubular support material is weak. The thermal expansion coefficients of the two materials are also different, and they are prone to fall off during use, resulting in the failure of the entire hydrogen purification device

In addition, traditional processes for preparing palladium membranes such as electroless plating and electroplating will produce a large amount of sewage containing heavy metal ions, which will pose serious problems in sewage treatment.

[0006] In view of the above problems, the inventor provided a palladium / palladium alloy membrane purifier and its use method in the Chinese patent (CN105967145B). The purifier has a compact structure and high hydrogen permeation efficiency. The air tightness is poor, and the palladium membrane tube is easy to break and fail when the crude hydrogen inlet pressure is high

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