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

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 priorart, 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...

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.

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