Ultra high hydrogen purifier

BG SeriesUltra high hydrogen purifierFeatures:

Palladium alloy is widely used in industry as a hydrogen permeable material for palladium tubes. In 1866, British scientist T. Graham discovered during experiments that palladium has a high ability to absorb hydrogen. Metal palladium can absorb up to 2800 times its own volume of hydrogen, and can release the absorbed hydrogen in vacuum at temperatures above 300 ℃. The hydrogen permeation function of palladium and its alloys is determined by this characteristic. Pure palladium has not been applied due to its deformation after hydrogen absorption. In 1956, American J.B. Hunter developed palladium silver alloy, which solved the deformation problem and led to the emergence of the technology of using hydrogen diffusion through palladium alloy to produce ultra pure hydrogen. In the future, Japanese people such as Yuzo Yamamoto and Ryo Goto made palladium silver gold multi-element alloys and used this alloy to manufacture ultra pure hydrogen purification devices. Countries such as the United Kingdom, the Federal Republic of Germany, the Soviet Union, and China have also developed palladium alloy materials and manufactured ultra pure hydrogen purification devices.

BG SeriesUltra high hydrogen purifierThe alloy made of palladium with silver, gold, ruthenium, yttrium, samarium, dysprosium, etc. not only improves the strength of palladium, but also enhances its hydrogen permeability. Practical palladium alloy hydrogen permeable materials include pure palladium and palladium silver alloys, which are commonly used as cathode materials for ultra pure hydrogen generators in small pure hydrogen sources. Palladium silver, palladium silver gold, and alloys with platinum, ruthenium, rhodium, iron, and nickel added to palladium silver gold are commonly used in hydrogen purification devices for high-temperature thermal diffusion. Binary alloys containing rare earth elements such as yttrium or samarium have high hydrogen permeability and hardness, and have great development prospects. However, due to poor oxidation resistance and welding performance, they have not yet been applied in industry. In addition, although nickel and 15-24 nickel gold alloys can pass through a small amount of hydrogen gas, they are rarely used in industry due to their high operating temperature (above 700 ℃) and low hydrogen permeation rate.

The process of producing pure hydrogen involves first evacuating the purification system to remove gas impurities from the pipeline system and the interior of the device. Simultaneously heat the palladium purification furnace until it reaches 400-500 ℃, then stop vacuuming, close the vacuum valve and connecting valve, open the original hydrogen valve, and introduce the original hydrogen (with high pressure) through the palladium alloy wall into the inner surface (i.e. pure hydrogen side), and flow out through the pure hydrogen flowmeter. Other gases (oxygen, nitrogen, etc.) remain on the original hydrogen side. The original hydrogen stream flows downwards from the upper part of the palladium purification furnace, with impurities continuously enriched and discharged from the waste hydrogen outlet. The hydrogen permeation rate through palladium alloy is directly proportional to the square root of the pressure difference between the original hydrogen side and the pure hydrogen side, exponentially proportional to the heating temperature, and inversely proportional to the thickness of the palladium alloy. To extend the service life of palladium alloy, the heating temperature is generally between 400 and 450 ℃, and should not exceed 400 ℃.

Palladium diffusion extraction of ultra pure hydrogen was successfully developed by Shandong Liaocheng Kewei Chemical Instrument Co., Ltd. and has been widely used. The purity of hydrogen gas is over 99.9%, and it is widely used in colleges, research institutions, electronics, materials science, aerospace, environmental protection, laboratories, analysis rooms, chromatography instruments, silicon epitaxy, rubber, tritium gas purification, atomic energy, and nuclear power, which is conducive to promoting national development and technological progress.