Steam temperature control and measurement

Steam temperature control and measurement

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This ends our system-by-system survey of boiler and HRSG C&I systems, and we return in Chapter 11 to look in more detail how the dynamics of these systems are taken into account by the boiler and turbine master controls to match the unit load demand, particularly for units that are required to change load frequently in response to the grid's requirement for power.

Chapter Contents:

  • 7.1 Why steam temperature control is needed
  • 7.2 The spray water attemperator
  • 7.2.1 The mechanically atomised attemperator
  • 7.2.2 The variable area attemperator
  • 7.2.3 The variable annulus desuperheater
  • 7.2.4 Other types of attemperator
  • 7.2.5 Radial discharge mechanically atomised attemperators
  • 7.2.6 Location of temperature sensors
  • 7.2.7 Control systems for spray water attemperators
  • Controller saturation effects
  • Prevention of overcooling
  • Multistage attemperators
  • 7.3 Advanced steam temperature control
  • 7.3.1 Two-loop control
  • 7.3.2 State controller with observer
  • 7.4 Controlling the temperature of reheated steam
  • 7.4.1 Reheat sprays
  • 7.4.2 Gas pass biasing dampers
  • 7.4.3 Temperature control with tilting burners
  • 7.4.4 Flue gas recycling
  • 7.4.5 Hot air injection
  • 7.5 Temperature measurement
  • 7.5.1 Measurement of air and flue gas temperature
  • 7.5.2 Measurement of steam temperature
  • 7.5.3 Measurement of metal temperature
  • 7.6 Summary

Inspec keywords: steam turbines; temperature measurement; power generation control; boilers; steam power stations; temperature control

Other keywords: steam temperature control; unit load demand; turbine master controls; HRSG C&I systems; steam temperature measurement; boiler

Subjects: Thermal variables measurement; Thermal variables control; Steam power stations and plants; Control of electric power systems

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