Method for detecting combustion conditions in combustors

• US 5,107,673 A
• Filed: 04/30/1991
• Issued: 04/28/1992
• Est. Priority Date: 08/09/1988
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Inose, Hiroshi, Sato, Isao, Hirose, Fumiyuki, Arai, Osamu, Urushidani, Haruo, Kirikami, Seiichi, Shimura, Akira
• Primary Examiner(s): Casaregola, Louis J.
• Application Number:
  US07/693,612
• Time in Patent Office: 364 Days
• Field of Search: 60/39.24, 60/39.27, 60/39.281, 60/39.29, 60/39.33, 60/39.5, 60/39.02, 431/76
• US Class Current: 60/772
• CPC Class Codes: F05D 2270/0831 indirectly, at the exhaust
• CPC Class Codes: F23N 2241/20 Gas turbines
• CPC Class Codes: F23N 5/003 using detectors sensitive to combustion gas properties F23N5/02, F23N5/18 - F23N5/26 take precedence

Abstract

A method for detecting combustion conditions in a plurality of combustors in a gas-turbine apparatus which includes the combustors and a gas turbine driven by combustion gas from the combustors, comprises a step for measuring concentration of unburnt component in the combustion gas by means of a plurality of sensors disposed on the downstream side of the gas turbine, a step for obtaining a distribution pattern of the measured concentration, and a step for investigating the distribution pattern to detect combustion conditions in the combustors.

Claims

1. A method for detecting combustion conditions in a plurality of combustors in a gas-turbine apparatus which includes a gas turbine driven by combustion gas from said combustors, said method comprising the steps of:

measuring a concentration of at least one uncombusted component in said combustion gas by a plurality of sensors disposed on a downstream side of said gas turbine;

obtaining a distribution pattern of said measured concentration; and

examining said distribution pattern to detect combustion conditions in said combustors.

2. A detecting method according to claim 1, wherein said steps are repeated over a predetermined time period.

3. A detecting method according to claim 1, wherein the step of measuring includes measuring the combustion gas at a position at which the combustion gas from the combustors flows at an increased speed.

4. A detecting method according to claim 1, wherein the step of examining includes storing the distribution pattern in a memory means, and comparing said distribution pattern with distribution patterns prestored in said memory means.

5. A control method for controlling combustion in a plurality of combustors in a gas-turbine apparatus which includes a gas turbine driven by combustion gas from said combustors, said method comprising the steps of:

measuring a concentration of at least one uncombusted component in said combustion gas by a plurality of sensors disposed on a downstream side of said gas turbine;

obtaining a distribution pattern of said measured concentration;

examining said distribution pattern to detect combustion conditions in said combustors; and

adjusting flow rates of air and/or fuel to be fed to the respective combustors in dependence upon detected combustion conditions.

6. A control method for controlling combustion according to claim 5, wherein each of said combustors includes a first stage combustion chamber and a second stage combustion chamber disposed downstream of said first stage combustion chamber, and wherein the step of adjusting includes adjusting flow rates of air and/or fuel fed to the respective second stage combustion chambers.

7. A control method for controlling combustion according to claim 6, wherein the step of examining includes storing the distribution pattern in a memory means, and comparing said distribution pattern with distribution patterns prestored in said memory means.

8. A control method for controlling combustion according to claim 5, wherein the step of measuring includes measuring the combustion gas at a position at which the combustion gas from the combustors flows at an increased speed.

9. A control method for controlling combustion according to claim 5, wherein the step of examining includes storing the distribution pattern in a memory means, and comparing said distribution pattern with distribution patterns prestored in said memory means.