System for combining flow from compressor bleeds of an industrial gas turbine for gas turbine performance optimization

  • US 6,615,574 B1
  • Filed: 01/14/2000
  • Issued: 09/09/2003
  • Est. Priority Date: 01/14/2000
  • Status: Expired due to Term
First Claim
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1. A system for bleeding air from plural ports in a multi-stage compressor to provide cooling and/or sealing air to an associated turbine for optimizing gas turbine performance, comprising:

  • a first casing portion surrounding a lower pressure stage of the compressor, said first casing portion having at least one bleed aperture defined therethrough;

    a first extraction flow path for conducting bleed air from said first casing portion to the turbine;

    a second casing portion surrounding a mid pressure stage of the compressor, said second casing portion having at least one bleed aperture defined therethrough;

    a second extraction flow path for conducting bleed air from said second casing portion to the turbine;

    a first cross over flow path interconnecting said first extraction flow path and said second extraction flow path for selective cross over flow therebetween;

    a first control valve provided in said first extraction flow path, upstream of said first cross over path;

    a second control valve provided in said second extraction flow path, upstream of said first cross over path;

    a first cross over control valve provided in said first cross over flow path for selectively controlling flow between said first extraction flow path and said second extraction flow path; and

    an ejector in flow communication with said first cross over flow path and said second extraction flow path, at a junction therebetween, whereby flow through and between said first and second extraction flow paths can be selectively controlled to supply air to the turbine at a proper pressure with an economic mixture of bleed air, so that the lower pressure, first extraction flow path can be communicated to a target portion of the turbine at a higher pressure than said low pressure extraction.

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