Gas Turbine Blade Temperature Sensor

 

Land Turbine Sentry - Gas Turbine Blade Temperature Sensor

In utility turbines it has been accepted practice to obtain turbine blade temperature by back-calculation from exhaust gas temperature readings. This method gives only a prediction of average blade row temperature, and uncertainties associated with this approach require the turbine to be operated below it's optimum efficiency.

 

Turbine Sentry uses optical pyrometers to measure blade temperatures, giving significantly better accuracy than traditional methods and showing individual blades clearly.

 

Benefits include:

  • Continuous on-line measurement of individual blade condition
  • Increased efficiency through improved engine firing rate
  • Detection of blocked cooling channels
  • Reliable, accurate blade row temperature
  • Early warning of potential blade failure caused by over-temperature operation
  • Continuous monitoring of blade coating condition
 turbine-sentry

 

Features

 

  • Modular Design - subsystems design simplify installation and maintenance
  • Rotor Sentry - single data processing unit, field-expandable to handle up to 32 turbines
  • Performance - 30 readings per blade for high resolution blade temperature profiles
  • Reliability - electronics separated from harsh engine environment by fiber optic link
  • Ease of Use - menu structured PC control,running under Windows NT®, for automatic or manual operation
  • Compatibility - exported tabular data can beused in any spreadsheet program accepting ASCII file format
  • Certified - Pyrometer manufactured to ATEX directive 94/9/EC (CE Ex II 3 G T6)

 

 

Description

 

The Turbine Sentry uses blade sentry pyrometers that are engine mounted to view the rotating gas turbine blades directly through a pressure-proof sight glass assembly. The optical signal collected by the pyrometer is transmitted through a rugged, flexible, fiber optic light guide to a remote electronic signal conditioner. The signal conditioner provides the following linear 4 to 20mA outputs for further analysis:

 

  • Profile - a high speed signal sent to the data acquisition system for data logging
  • Peak - the highest temperature on the blade array
  • Average - the average temperature of the blade array
  • Average Peak - the average of the highest temperature of each of the blades

 

A key phasor/power supply module (KP/PSU) provides power for each pyrometer and converts the gas turbine, once per revolution pulse (from the GT), into a trigger signal for use with Rotor Sentry data acquisition system. The KP/PSU also provides user connections to pyrometer outputs of peak rotor temperature, average rotor temperature and average peak rotor temperature outputs from the pyrometer.

 

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