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Anti-surge speed control of a compressor in a VPSA apparatus

A technology of compressors and centrifugal compressors, applied in engine control, pump control, mechanical equipment, etc., can solve problems such as unexpected occurrences

Active Publication Date: 2015-02-04
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, surge can occur quite unexpectedly during the evacuation and purge steps and especially during the transition between the purge and evacuation steps

Method used

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  • Anti-surge speed control of a compressor in a VPSA apparatus
  • Anti-surge speed control of a compressor in a VPSA apparatus
  • Anti-surge speed control of a compressor in a VPSA apparatus

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Embodiment Construction

[0032] see figure 1 , shows a vacuum pressure swing adsorption apparatus 1 designed to generate an oxygen product. Although the vacuum pressure swing adsorption apparatus 1 is a single bed design, it should be understood that this is for purposes of illustration and that the present invention will have advantages for use with single or multiple adsorption beds designed to pressurize and evacuate. Same suitability for multi-bed designs with multiple compressors. Furthermore, the invention is equally applicable to vacuum pressure swing adsorption devices designed to generate other products such as carbon dioxide, nitrogen, hydrogen or helium. Therefore, the vacuum pressure swing adsorption device 1 is shown and described herein for exemplary purposes only.

[0033] The vacuum pressure swing adsorption device 1 draws in air via an inlet 10 which contains a filter to filter out particles. The resulting air feed stream is drawn by compressor 12 which has an aftercooler 14 to rem...

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Abstract

The present invention relates to a method and control system to control the speed of a centrifugal compressor operating within a vacuum pressure swing adsorption process to avoid an operation at which surge can occur and directly driven by an electric motor that is in turn controlled by a variable frequency drive. In accordance with present invention an optimal speed for operation of the compressor is determined at which the compressor will operate along a peak efficiency operating line of a compressor map thereof. This speed is adjusted by a feed back speed multiplier when the flow or other parameter referable to flow through the compressor is below a minimum and a feed forward multiplier during evacuation and evacuation with purge steps that multiplies the feed back multiplier to increase speed of the compressor and thereby avoid surge.

Description

technical field [0001] The present invention provides a method and control system for controlling the speed of a centrifugal compressor operated within a vacuum pressure swing adsorption plant and driven directly by an electric motor to avoid the compressor going into surge. More specifically, the present invention relates to such methods and systems, wherein the velocity is increased during at least those steps of a repeated cycle performed by a vacuum pressure swing adsorption apparatus, wherein the compressor may experience surge, and the total increase is based on A step change in progress. Background technique [0002] In a vacuum pressure swing adsorption process, one or more adsorbents are used to adsorb one or more components of a feed stream and thereby produce a purified product stream. A typical process has a series of consecutively executed steps according to a repeating loop. In a repeating cycle, adsorbent beds containing adsorbent are alternately used to pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/02B01D53/047
CPCB01D2259/401B01D2257/102F04D27/0261B01D2253/112B01D2259/402B01D2256/18B01D2256/12B01D2258/06B01D53/0476B01D2256/16F04D15/0066B01D2256/22B01D2256/10B01D2251/302B01D2259/40007F05D2270/04Y02B30/70
Inventor A.C.罗辛斯基P.W.贝朗格M.S.曼宁
Owner PRAXAIR TECH INC
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