Method and apparatus for purifying helium by condensing method
A purification method, helium technology, applied in chemical instruments and methods, inert gas compounds, inorganic chemistry, etc., can solve problems such as no adsorbent
Active Publication Date: 2012-10-10
SHANGHAI QIYUAN GAS DEV
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Argon currently has no sui
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[0040] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, a helium purification method and device proposed according to the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.
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The present invention relates to a method and an apparatus for recovering helium at low temperature by using cryogenic adsorption. The apparatus comprise a feed gas compressor and a cooling system thereof; and a set of external cryogenic cooling system placed in a small cold box uses a pressure mixed gas after refrigerant cooling pressurization. According to the invention, an absorption tower is arranged between a first-stage condensation and a second-stage condensation, and uses liquid nitrogen as a downstream liquid to absorb oxygen, argon and carbon monoxide in feed gas, so that the outlet feed gas only contains nitrogen impurity; and the nitrogen impurity can be removed directly by cryogenic adsorption. The helium purification apparatus provided by the invention is suitable for feed gas containing ingredients such as nitrogen, oxygen and argon; the absorption tower is arranged to simplify the process, and under the cooperation with multistage flash evaporation and cryogenic adsorption, the helium purity is up to higher than 99.999%. Therefore, the method and apparatus are very practical.
Description
technical field [0001] The invention relates to a method and a device for preparing high-purity helium, in particular to a method and a device for purifying helium containing at least carbon monoxide, oxygen, nitrogen and argon as impurities by using a condensation method. Background technique [0002] Helium is colorless and odorless, and is a gaseous inert gas at room temperature. It is the most difficult to liquefy inert gas. Utilizing the ultra-low boiling point of helium -268.9°C, it can be used for ultra-low temperature cooling. Also due to the inert nature of helium. It is often used as the filling gas for spaceships or advertising balloons. Helium is widely used in the mixed gas for breathing in the field of marine development, and in the cooling of superconducting electromagnets in nuclear magnetic resonance equipment in the medical field. However, with the rapid development of various industries, helium is widely used in aerostats, leak detection, electronics, ...
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Inventor 葛亮曹月丛喻永贵俞建
Owner SHANGHAI QIYUAN GAS DEV
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