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Krypton and xenon concentration and neon and helium concentration circulating nitrogen containing integrating device and method

A technology that integrates devices and nitrogen, applied in refrigeration and liquefaction, lighting and heating equipment, liquefaction and other directions, can solve the problems of high equipment investment cost, low recovery rate and high energy consumption, and achieve the effect of reducing investment cost and energy consumption

Active Publication Date: 2018-08-17
瀚沫能源科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in view of the defects of low equipment recovery rate, high equipment investment cost and high energy consumption in the above-mentioned prior art, those skilled in the art urgently need to develop a method that can integrate the processes of neon-helium enrichment and krypton-xenon enrichment

Method used

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  • Krypton and xenon concentration and neon and helium concentration circulating nitrogen containing integrating device and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like figure 1 As shown, this embodiment provides an integrated device for enriching krypton-xenon and enriching neon-helium containing circulating nitrogen, including: a nitrogen circulating compressor 1, a cold box 2, and a main heat exchanger 3 arranged in the cold box 2, a lean Krypton tower 5, lean krypton tower condensing evaporator 6, subcooler 7, crude neon tower condensing evaporator 8 and rough neon tower 9, lean krypton tower 5 bottom is provided with lean krypton tower reboiler 4.

[0038] Specifically, the nitrogen cycle compressor 1 communicates with the top of the krypton-poor tower reboiler 4 through a pipeline, and the bottom of the krypton-poor tower reboiler 4 communicates with the top of the krypton-poor tower condensing evaporator 6 through a pipeline through cooler 7; The top of the krypton tower 5 communicates with the outside of the cold box 2 through the main heat exchanger 3 through pipelines, and communicates with the upper part of the poor kry...

Embodiment 2

[0046] This embodiment provides an integrated method for enriching krypton-xenon and enriching neon-helium with circulating nitrogen, which specifically includes the following steps:

[0047] Step 1, inject the liquid oxygen from the air separation equipment into the krypton-poor tower 5 in the cold box 2, and the pressure nitrogen generated by the nitrogen circulation compressor 1 and heat-exchanged by the main heat exchanger 3 passes through the krypton-poor tower again Boiler 4 provides heat for poor krypton tower 5;

[0048] Step 2, at the same time, the pressure nitrogen gas liquefied in the lean krypton tower reboiler 4 is cooled by the cooler 7, and then enters the lean krypton tower condensing evaporator 6 after throttling through the throttle valve to provide cooling capacity for the lean krypton tower 5;

[0049] Step 3, the liquid oxygen is rectified and concentrated in the krypton-poor tower 5, and the krypton-xenon concentrate meeting the design concentration is o...

Embodiment 3

[0055] This embodiment provides an integrated application of krypton-xenon enrichment and neon-helium enrichment with circulating nitrogen, please continue to refer to figure 1 As shown, the main heat exchanger 3 is configured in the cold box 2 to recover cooling capacity, the lean krypton tower 5 is used to concentrate krypton and xenon, and the thick neon tower 9 is used to concentrate neon and helium.

[0056] During use, liquid oxygen from air separation equipment (usually an external compression process) (amount of 1000Nm3 / h, composition: O2: 99.7%, Kr: ~ 109ppm; Xe: 17ppm; methane: ~ 33ppm; other components Divide: argon) directly injected into the poor krypton tower 5 in the cold box 2, the operating pressure of the poor krypton tower 5 is generally 0.05MPaG~0.2MPaG, and the operating temperature will be different depending on the pressure and the concentration limit. Pressure nitrogen (saturated state, 0.5-1.0Mpa) provides heat for the lean tower 5 through the lean tow...

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Abstract

The invention discloses a krypton and xenon concentration and neon and helium concentration circulating nitrogen containing integrating device and method. The integrating device comprises a nitrogen circulating compressor, a cold box and further comprises a main heat exchanger, a poor krypton tower, a poor krypton tower condensation evaporator, a subcooler, a rough neon tower condensation evaporator and a rough neon tower, all of which are arranged in the cold box, and a poor krypton tower reboiler is arranged at the bottom of the poor krypton tower. The poor krypton tower and the rough neon tower are integrated in one cold box, through mutual guide-in of nitrogen or liquid nitrogen, the cooling capacity of the liquid oxygen and the high nitrogen content of noncondensable gas are sufficiently utilized, and the krypton and xenon concentration and neon and helium concentration investment cost and the liquid nitrogen supplementing amount are reduced; and through usage of the nitrogen circulating compressor, the nitrogen of the noncondensable gas is utilized, additional nitrogen supplementing is not needed, and accordingly the purpose of energy consumption reduction is achieved.

Description

technical field [0001] The invention relates to a gas concentration method, in particular to an integrated device and method for krypton-xenon concentration and neon-helium concentration containing circulating nitrogen. Background technique [0002] Neon and helium are inert gases, and their content in air is only 18.18×10 -6 and 5.24×10 -6 . Neon and helium are non-condensable gases in the rectification column of the air separation plant, but accumulate in the top of the main condenser and in the nitrogen reflux liquid in a gaseous state. [0003] The content of krypton and xenon in the atmosphere is about 1.138×10 -6 and 0.0857×10 -6 After the trace amount of krypton and xenon enter the cryogenic rectification tower of the air separation unit with the air, the high boiling point components krypton, xenon, hydrocarbons (mainly methane) and fluorides are all accumulated in the liquid oxygen of the low pressure tower. [0004] There is also non-condensable gas rich in ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04
CPCF25J3/04642F25J3/04745F25J3/0489F25J2200/32F25J2200/34F25J2215/30F25J2215/32F25J3/04351
Inventor 郝文炳
Owner 瀚沫能源科技(上海)有限公司