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Device and method for extracting krypton and xenon in liquid oxygen through low-temperature rectification

A low-temperature rectification and extraction technology, which is applied in the field of krypton and xenon gas in the extraction of liquid oxygen by cryogenic rectification, can solve the problems of high risk of hydrocarbon air separation units, achieve high recovery rate and wide application range , Increase the effect of added value

Pending Publication Date: 2021-03-02
HANGZHOU HANGYANG
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Problems solved by technology

[0004] In the known method, the poor krypton tower is arranged inside the air separation unit, so the production of krypton and xenon is limited by the scale of the air separation unit, and is restricted by the amount of raw material air; Excessive content is extremely dangerous to the air separation unit

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  • Device and method for extracting krypton and xenon in liquid oxygen through low-temperature rectification

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[0031] at 3000 Nm 3 / h liquid oxygen production as an example. 3000 Nm 3 / h Raw material liquid oxygen contains 100ppm Krypton, 30ppm Xenon, 100ppm C n h m (hydrocarbons), introduced into the tower at the position of 5 theoretical stages above the bottom of the primary concentration tower 1 for rectification. The theoretical stage of the primary concentration tower 1 is 12. Most of the high-boiling point krypton, xenon and hydrocarbons condense and flow down to the bottom of the primary concentration tower 1, and the low-boiling point oxygen, argon and a small amount of krypton and xenon evaporate from the downstream liquid and reach the top of the tower, where they are condensed by liquid nitrogen The latter part is used as the spray liquid of the primary concentration tower 1, and a part is sent to the secondary concentration tower 2. The oxygen and argon with low boiling point are volatilized from the downstream liquid, and the krypton and xenon with high boiling point a...

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Abstract

A device for extracting krypton and xenon in liquid oxygen through low-temperature rectification comprises a first-stage concentrating tower, a second-stage concentrating tower, a third-stage concentrating tower, a high-pressure oxygen pump, a water bath type vaporizer, a high-pressure throttle valve, a heat regenerator, an impurity and methane removing module and a heat exchanger, wherein one side of the lower portion of the first-stage concentrating tower is connected with a first pipeline for feeding raw material liquid oxygen, the bottom of the first-stage concentrating tower is sequentially connected with the high-pressure oxygen pump, a liquid oxygen channel of the water bath type vaporizer, the high-pressure throttle valve, the heat regenerator, the impurity and methane removing module, an oxygen channel of the water bath type vaporizer and an oxygen channel of the heat exchanger through pipelines, and the oxygen channel of the heat exchanger is connected with the upper portionof the third-stage concentrating tower through a sixth pipeline. The second-stage concentrating tower is mounted above the third-stage concentrating tower, the top of the second-stage concentrating tower is connected with the middle of the first-stage concentrating tower through a pipeline, and a second reboiler is arranged between the second-stage concentrating tower and the third-stage concentrating tower. The device for extracting the krypton and the xenon in the liquid oxygen through low-temperature rectification is wide in application range and can operate independently, treat a large amount of liquid oxygen without being limited by the scale of an air separation device, and produce the krypton and the xenon on a large scale.

Description

technical field [0001] The invention relates to a method for extracting krypton and xenon gas from liquid oxygen by cryogenic rectification, and relates to a device and method for safely and economically extracting krypton and xenon from common liquid oxygen. Background technique [0002] The content of krypton and xenon in the atmosphere is extremely small, respectively 1.14ppm (one part per million) and 0.08ppm, known as "golden gas", so it is very difficult to extract directly from the air. Obtaining oxygen and nitrogen by the air separation unit is a method known in the art. Because the boiling points of krypton, xenon and hydrocarbons are closer to the boiling point of liquid oxygen, they are concentrated in liquid oxygen and discharged from the air separation unit to the liquid oxygen storage tank, wherein The contents of hydrocarbons, krypton and xenon are all lower than 100ppm, so using liquid oxygen as raw material to extract krypton and xenon gas has great economic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/02
CPCF25J3/028F25J3/04745F25J3/04975F25J3/04757F25J3/04278F25J2270/42F25J2270/12F25J2235/50F25J2240/46F25J2205/82F25J2205/30F25J3/0489F25J2200/04F25J2200/34
Inventor 包汉波何晖李相承康玉茹朱程浩李冬锋李剑锋吴秀杰袁士豪孙潇
Owner HANGZHOU HANGYANG
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