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System and apparatus for compressing and cooling an incoming feed air stream in a cryogenic air separation plant

A technology of low-temperature air separation and compressed air flow, which is applied to the components of pumping devices for elastic fluids, cold processing separation, pumping devices, etc., which can solve the problems of reduced overall equipment efficiency and power waste.

Inactive Publication Date: 2018-06-08
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Maintaining an approximately constant discharge pressure in such air separation plants can also result in wasted power and a reduction in overall plant efficiency under all operating conditions

Method used

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  • System and apparatus for compressing and cooling an incoming feed air stream in a cryogenic air separation plant
  • System and apparatus for compressing and cooling an incoming feed air stream in a cryogenic air separation plant
  • System and apparatus for compressing and cooling an incoming feed air stream in a cryogenic air separation plant

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Embodiment Construction

[0037] As used herein, the phrase common air compression (CAC) system refers to a plurality of compression stages, intercoolers, Aftercooler and pre-purification unit. A general air compression system typically includes a compressor in a MAC compression arrangement (or pre-MAC arrangement) and optionally one or more initial compression stages including a BAC compression arrangement, wherein each compressor within the general air compression system is configured for for compressing essentially all feed air streams.

[0038] As used herein, the phrase split air compression (SFAC) system refers to the compression, cooling, and / or expansion of a selected portion of a compressed pre-purified air stream from specified conditions to a flow, pressure, and temperature suitable for Multiple compression stages, intercoolers, aftercoolers, and turboexpanders that: (i) boil the liquid product from the distillation column system, (ii) generate cold turbo and / or hot turbo refrigeration for ...

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Abstract

A system and apparatus for compression of an incoming feed air stream using at least two variable speed compressor direct drive assemblies controlled in tandem is provided. The first variable speed driver assembly directly drives at least one compression stage in the lower pressure compressor while the second variable speed driver assembly directly drives higher pressure compression stage disposedeither in the common air compression train or the split functional compression train of the air separation plant. The first and second variable speed driver assemblies are preferably high speed, variable speed electric motor assemblies each having a motor body, a motor housing, and a motor shaft with one or more impellers directly and rigidly coupled to the motor shaft via a sacrificial rigid shaft coupling.

Description

technical field [0001] The present invention relates to the compression of a feed air stream in a cryogenic air separation plant, and more particularly to a method of compressing a feed air stream using at least two direct drive compression modules controlled in series. Background technique [0002] Cryogenic air separation is a very energy-intensive process due to the generation of high-pressure, very cold air streams and the large amounts of refrigeration required to drive the process. In a typical cryogenic air separation plant, the feed air stream is passed through a main air compressor (MAC) arrangement to achieve the desired intermediate discharge pressure and flow. Prior to such compression, dust and other contaminants are typically removed from the feed air stream via an air filter, typically located in the suction filter housing. The filtered air stream is compressed in a multi-stage MAC compression arrangement, typically to a minimum pressure of about 6 bar and of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04F04D25/06F04D17/12F04D27/02
CPCF04D17/12F04D25/16F04D27/0261F25J3/04781F25J3/04884F25J3/04957F25J3/04018F25J3/04024F25J3/0409F25J3/04133F25J3/0429F25J3/04296F25J3/04303F25J3/04412F25J3/04678F25J2230/20F25J2230/24F25J2230/40F25J2250/02F04D27/0269F04D29/266F04F5/52F05D2260/311Y02B30/70F04D25/06F04D27/004
Inventor C·L·施瓦尔茨A·F·阿卜杜勒瓦哈卜L·J·罗斯G·W·亨茨勒H·E·霍华德T·J·克洛维
Owner PRAXAIR TECH INC
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