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A device and method for producing high-purity nitrogen and low-purity oxygen

A low-purity, high-purity technology, applied in refrigeration and liquefaction, lighting and heating equipment, liquefaction, etc., can solve problems such as energy waste, achieve the effect of reducing production costs, reducing repeated construction and investment, and objective economic benefits

Active Publication Date: 2018-02-02
HENAN KAIYUAN AIR SEPARATION GRP CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiency of energy waste caused by the venting of low-concentration oxygen in the preparation process of the existing high-purity nitrogen device, the present invention provides a device for producing high-purity nitrogen and low-purity oxygen by using air and method

Method used

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  • A device and method for producing high-purity nitrogen and low-purity oxygen

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Embodiment 1

[0034] See attached figure 1 , the present invention produces the device of high-purity nitrogen and low-purity oxygen, comprises 1 main heat exchanger E1, 2 rectifying tower C1, 3 condenser K1, 4 condenser K2, 5 subcooler E2 and 6 turbo expanders ET1, each device is connected through pipelines, and the connection relationship is:

[0035] The air inlet of the main heat exchanger E1 is the input port of filtered and purified air, and its air outlet communicates with the air inlet at the lower part of the rectification tower C1 through the 101 pipeline; the high-purity nitrogen outlet at the top of the rectification tower C1 passes through The 201 pipeline is divided into two parts and enters the 201A pipeline and the 201B pipeline respectively. The 201A pipeline is connected with the high-purity nitrogen inlet of the main heat exchanger E1, and the high-purity nitrogen is discharged and collected from the main heat exchanger E1 outlet; the 201B pipeline is respectively connect...

Embodiment 2

[0040] See attached figure 1 , the present invention utilizes the device described in embodiment 1 to produce the method for high-purity nitrogen and low-purity oxygen, the detailed steps of this method are as follows:

[0041] a. The air from the atmosphere is firstly compressed, then filtered and purified by conventional methods to remove moisture and carbon dioxide in the air; the purified air enters the main heat exchanger E1 for cooling down to -170°C;

[0042] b. The air cooled by the main heat exchanger E1 in step a enters the rectification tower C1 from the lower part of the rectification tower C1 through the 101 pipeline (the rectification tower adopts a plate rectification tower) for rectification and separation, and after separation, the rectification tower C1 High-purity nitrogen is obtained at the top (the purity of high-purity nitrogen is ≥99.9995%), and oxygen-enriched liquid air is obtained at the bottom; among the obtained high-purity nitrogen, the high-purity...

Embodiment 3

[0045] Embodiment 3: basically the same as Embodiment 2, the difference is:

[0046] In step c: the oxygen-enriched liquid air is evaporated in K1 with an evaporation rate of 50%; the oxygen-enriched gas product 1 is obtained (the product has a purity of 24.9% and a pressure of 11KPa);

[0047] In step d: the oxygen-enriched gas product 2 is obtained, the purity of the obtained oxygen-enriched gas product 2 reaches 47%, and the pressure p reaches 0.23 MPa.

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Abstract

The invention discloses a device and a method for preparing high-purity nitrogen and low-purity oxygen. The device of the present invention comprises a main heat exchanger, a rectifying tower, two condensers, a subcooler and a turbo expander, and the devices are connected through pipelines. The air in the atmosphere enters the main heat exchanger to cool down after being compressed, filtered and purified, and then enters the rectification tower for separation. After separation, the top of the rectification tower obtains high-purity nitrogen, and the bottom obtains oxygen-enriched liquid air. Part of the obtained high-purity nitrogen is reheated to normal temperature by the main heat exchanger and sent out for collection, and the remaining high-purity nitrogen is condensed into liquid nitrogen by the condenser as the reflux liquid. The oxygen-enriched liquid air is sequentially processed by the cooler, condenser, expander and main heat exchanger to obtain two oxygen-enriched gas products. Through the present invention, while obtaining high-purity nitrogen, it is also possible to obtain oxygen-enriched products with higher oxygen purity of different purities and pressures, and the device can also operate in multiple working conditions to meet the requirements of oxygen-enriched products with different purities and pressures. .

Description

technical field [0001] The invention belongs to the technical field of gas separation methods and devices, in particular to a device and method for producing high-purity nitrogen and low-purity oxygen from air. Background technique [0002] Safety and reliability, energy saving and emission reduction are the basic requirements and prerequisites for air separation equipment, the needs of building a resource-saving and environment-friendly society and scientific development, and also market expectations. Both the emerging coal chemical industry and the mature iron and steel metallurgy industry need a large amount of low-purity oxygen. In order to protect the environment and capture carbon dioxide, oxygen-enriched combustion has also become a trend in the development of power plants. [0003] In the current high-purity nitrogen plant, while producing high-purity nitrogen, the by-product is low-purity oxygen-enriched. Usually, since the oxygen content of this part of the gas i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J3/04284F25J3/0423F25J3/044F25J2200/72F25J2250/10F25J2250/20
Inventor 张世田贾军彭明扬
Owner HENAN KAIYUAN AIR SEPARATION GRP CO LTD
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