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Method and device for producing pressure high-purity nitrogen and high-purity oxygen

A high-purity oxygen and high-purity nitrogen technology, applied in the field of gas production methods and devices, can solve the problems of difficulty in preparing high-purity oxygen, expensive catalysts, and long process routes

Inactive Publication Date: 2010-11-17
上海启元科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For users who only produce high-purity nitrogen with single or double towers, usually without argon towers, it is difficult to prepare high-purity oxygen
Use chemical method to clear methane and other components in oxygen, and then set up an oxygen rectification tower to remove it. The investment is large, the palladium catalyst and other catalysts are expensive, and the process route is long.

Method used

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  • Method and device for producing pressure high-purity nitrogen and high-purity oxygen
  • Method and device for producing pressure high-purity nitrogen and high-purity oxygen
  • Method and device for producing pressure high-purity nitrogen and high-purity oxygen

Examples

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Effect test

Embodiment 1

[0029] A device for producing pressurized high-purity nitrogen and high-purity oxygen, its structure is as follows figure 1 As shown, the purified air is compressed, and the purified compressed air is cooled in the air pre-cooling system, and after entering the molecular sieve purification system to remove carbon dioxide and moisture, the purified compressed air 1 enters the fractionation tower cold box in the main heat exchanger The upper section E1 and the lower section E2 heat exchange and cool down to a saturated state, and enter the high-pressure rectification tower C1 through the throttle valve V1, and part of the compressed air extracted from the lower section E2 of the main heat exchanger is used as the heat source 14 entering the reboiler of the oxygen rectification tower. Oxygen rectification tower reboiler K2, compressed air is liquefied into oxygen rectification tower reboiler condensate 15, this oxygen rectification tower reboiler condensate 15 is liquid air, enter...

Embodiment 2

[0036] A method and device for producing pressurized high-purity nitrogen and high-purity oxygen, the structure of which is as follows figure 2 As shown, the difference from Example 1 is that the heat source entering the oxygen rectification tower reboiler K2 is the nitrogen separated by the high-pressure rectification tower C1, and the nitrogen is liquefied into the oxygen rectification tower reboiler condensate 15, and the condensate It is liquid nitrogen, and the liquid nitrogen is refluxed to the top of the high-pressure rectification tower C1 as the reflux liquid of the high-pressure rectification tower. The position of the reboiler K2 of the oxygen rectification tower should be higher than that of the feed port of the liquid nitrogen to overcome the resistance of the nitrogen pipeline.

Embodiment 3

[0038] A device for producing pressurized high-purity nitrogen and high-purity oxygen, its structure is as follows image 3 As shown, the difference from Example 2 is that the liquid nitrogen 4 of the high-pressure rectification tower is divided into two strands before entering the throttle valve V3, and one strand enters the top of the medium-pressure rectification tower C2 after being depressurized in the throttle valve V3 as a medium pressure The reflux liquid of the rectification tower C2, the other stream is decompressed in the throttle valve V4 and enters the top of the oxygen rectification tower C3 as the reflux liquid of the oxygen rectification tower C3. The oxygen liquid 6 enters below the C3 liquid nitrogen inlet of the oxygen rectification tower after being depressurized by the throttle valve. In this way, the extraction rate of high-purity nitrogen under pressure is appropriately reduced to increase the extraction rate of high-purity oxygen.

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Abstract

The invention relates to a method and a device for producing pressure high-purity nitrogen and high-purity oxygen. The device comprises a high-pressure tower, a medium-pressure tower and an oxygen tower. A reboiler is arranged at the bottom of the oxygen tower; and liquid nitrogen and oxygen-enriched liquid air separated from the air in the high-pressure tower enter the medium-pressure tower to be separated into medium-pressure nitrogen and oxygen-enriched liquid in the high-pressure tower. A part of low-purity oxygen which is rich in methane and other high boiling point components is exhausted from the bottom of the medium-pressure tower; a low methane-containing oxygen-enriched liquid extraction opening is formed on the side of the medium-pressure tower; and the oxygen-enriched liquid enters into the oxygen tower for rectification, and the high-purity oxygen is extracted from a tower bottom or a plurality of tower plates on the upper part of the tower bottom. Compared with the prior art, the device and the method can realize simultaneous preparation of pressure nitrogen and high-purity oxygen, wherein the extraction ratio of the pressure nitrogen is 65 to 72 percent, the nitrogen pressure is 0.15 to 0.4 MPa, and the extraction ratio of the high-purity oxygen is 10 to 20 percent of the oxygen in air. The device can prepare low-cost protective gas pressure nitrogen for the float glass and other industries using pressure nitrogen, and can produce high additional value high-purity oxygen products.

Description

technical field [0001] The invention relates to a gas production method and device, in particular to a method and device for producing pressured high-purity nitrogen and high-purity oxygen. Background technique [0002] With the rapid development of the electronics industry and the chip industry, the demand for high-purity oxygen has increased sharply. Usually, the photovoltaic industry also needs high-purity oxygen while using high-purity nitrogen. In the traditional air separation process, the raw material for producing high-purity oxygen The source is industrial-grade liquid oxygen or oxygen (above 99.5%). It is necessary to set up a tower to remove high-boiling components, or extract an oxygen-rich fraction without high-boiling components from the middle of the argon column, and then send it into high-purity oxygen. Distillation takes place in the distillation column. For users who only produce high-purity nitrogen with single or double towers, usually without argon tow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04
Inventor 周大荣俞建
Owner 上海启元科技发展有限公司
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