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Air separation unit and method

A technology of air separation and low pressure column, applied in separation methods, distillation separation, chemical instruments and methods, etc., can solve the problems of increasing investment cost, increasing the size of low pressure column, etc., and achieve the effect of shortening delivery time

Inactive Publication Date: 2018-12-28
汪条英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, it is possible to increase the size of the low-pressure column
Both solutions imply increased investment costs

Method used

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  • Air separation unit and method
  • Air separation unit and method

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Embodiment Construction

[0031] Air distillation facility (in figure 1 ) consists of a medium-pressure column 1, which typically operates at a pressure of about 6 bar absolute, above which is installed a low-pressure column 2, which typically operates at slightly higher than atmospheric pressure. Note that there are no columns for the production of impure or pure argon. Evaporator-condenser 4 maintains at the top of column 1 a vapor consisting essentially of pure nitrogen in heat exchange relationship with a liquid from the bottom of column 2 consisting essentially of pure oxygen.

[0032] Column 1 receives pressurized and purified air to be separated and produces an oxygen-enriched liquid stream and a nitrogen-enriched liquid stream, both of which are sent to low pressure column 2 .

[0033] figure 1 The illustration in is highly schematic and essentially the purpose is to show the fluid inlets / outlets of the plant and the distillation sections it defines.

[0034] The main shell of low pressure c...

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PUM

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Abstract

The invention relates to an air separation unit and method. The device comprises a medium-pressure tower (1) and a low-pressure tower (2) but does not comprise an argon production tower, the low-pressure tower comprises at least four distillation sections (24, 25, 26, 27 and 28), at least the first middle distillation section (25) of the low-pressure tower is surrounded by an auxiliary casing, theauxiliary casing defines a space, the space is divided into a lower part section and an upper part section in the radial direction of the tower, one or more middle sections are positioned in the middle part of the low-pressure tower, and the capacity of each first middle section is larger than that of at least one adjacent section (24 and 26).

Description

technical field [0001] The present invention relates to an air separation unit and method. Background technique [0002] During the design process of an air separation unit, it is often necessary to modify its design in response to changes in customer requirements. For example, a customer may realize that he needs to produce argon when the unit has been designed not to produce argon, or even already exists without an argon column. [0003] One way to solve this problem is to design a unit with a column capable of producing argon but venting the argon-rich gas into residual nitrogen when argon is not needed. In addition, it is also possible to increase the size of the low pressure column. Both solutions imply increased investment costs. [0004] An air distillation facility allowing for the production of argon generally consists of a medium pressure column typically operated at about 6 bar absolute, topped with a gas typically operating at slightly above atmospheric pressu...

Claims

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Application Information

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IPC IPC(8): B01D3/14
CPCB01D3/146
Inventor 汪条英
Owner 汪条英
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