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An air separation device and method with nitrogen liquefier

A technology of air separation and liquefier, applied in liquefaction, refrigeration and liquefaction, cold treatment separation, etc., to achieve the effects of optimizing energy consumption, saving equipment investment, and flexible use

Active Publication Date: 2022-07-12
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the customer requires a higher pressure gaseous oxygen product to be produced in a full low-pressure process, it is necessary to extract a liquid oxygen product stream from the tower, pressurize it through at least one liquid oxygen pump, and then enter the heat exchanger to evaporate to obtain Gaseous oxygen product; the high-purity liquid oxygen collected at the bottom of the low-pressure tower is preferably extracted, pressurized by the liquid oxygen pump, and then enters the heat exchanger to evaporate to obtain high-purity gaseous oxygen product, but there is a problem, due to the design requirements of the heat exchanger , a heat exchange stream with matching pressure is required to evaporate the pressurized high-purity liquid oxygen

Method used

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  • An air separation device and method with nitrogen liquefier
  • An air separation device and method with nitrogen liquefier
  • An air separation device and method with nitrogen liquefier

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Embodiment Construction

[0082] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to such an embodiment described below, and the technical idea of ​​the present invention may be implemented in combination with other known technologies or other technologies having the same functions as those known technologies.

[0083] In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of the two elements or the interaction relationship between the two elements. F...

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Abstract

The present invention discloses a device and method for producing a higher pressure gaseous oxygen product in a full low pressure air separation process with a nitrogen liquefier. In the present invention, the high-purity liquid oxygen collected at the bottom of the low-pressure column is first extracted, and pressurized by at least one liquid oxygen pump to obtain the pressurized high-purity liquid oxygen, and the existing compressor and / or the nitrogen liquefier is used. The booster produces a nitrogen heat exchange stream with matching pressure for evaporating pressurized high-purity liquid oxygen in the heat exchanger to obtain a higher pressure gaseous oxygen product. The present invention efficiently integrates the existing air separation device and nitrogen liquefier, saves equipment investment and optimizes energy consumption.

Description

technical field [0001] The invention belongs to the field of low temperature air separation, and relates to an air separation device and method with a nitrogen liquefier. Background technique [0002] In many chemical projects (eg, coal chemical, oxy-fuel combustion, etc.), very large quantities of gaseous oxygen product are required, in some examples as high as 100 to 200 tons of oxygen per day. At this magnitude, cryogenic air separation units are the preferred method for producing oxygen products. In cryogenic air separation units, air is compressed and then purified to remove higher boiling impurities such as carbon dioxide, moisture and hydrocarbons. The resulting compressed and purified feed air can be cooled in the main heat exchanger to a temperature suitable for its rectification, and then introduced into a rectification system having a high pressure column and a low pressure column. [0003] In the low-temperature air separation process, the air that has been coo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J3/04309F25J3/04412F25J2210/40F25J2215/04F25J2215/50F25J3/04224F25J3/04236F25J3/0423F25J3/04357F25J3/04393F25J3/0409F25J1/0202F25J1/0015F25J1/0037F25J1/004F25J1/0045F25J1/0035F25J1/0234F25J1/0288
Inventor 赵伯伟
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE