The accurate and reliable measurement of gas path temperatures is critical for any boiler operator or engineer to determine the performance of a furnace, and to better understand the consequences of decisions or modifications which are made in the combustion process. Clyde Bergemann offers both the optical and acoustic methods of furnace exit gas temperature measurement. FEGT measurement reduces operating costs by providing

• better control of furnace wall blowers and soot blowers,
• better burner control (tilt and excess air),
• and superior steam temperature control.

SpectraTemp and AccuTemp can also be used for improved process optimization in other industrial processes where accurate control of the temperature of particulate laden gas streams is important.

For those applications where a single point of FEGT will suffice, the SpectraTemp™ is a widely installed device which will provide years of reliable service to the plant operator. This device monitors the radiation emission from the particulate matter in the flue gas path, is easy to install and operate and can provide the data required to monitor the process effectively.

SpectraTemp determines particulate temperature by measuring light emissions for the particulates at three different wavelengths. These wavelengths are selected to avoid interferences from cool, heat-transfer surfaces (e.g. boiler walls). SpectraTemp’s design gives it a unique capability to determine a line-of-sight average temperature all the way across a particulate-laden stream. Automatic calibration, fault detection, and alarms are incorporated into SpectraTemp; and both analog and digital outputs are supplied for interfacing with plant control systems.

For larger, or more demanding applications, the use of acoustic pyrometer technology can be advantageous. An acoustic signal generator transmits a sound across the furnace which is receives at the far side. The exact time of travel of the sound wave is recorded, and this accurately determines the mean temperature of the gas. When more than one transmitter is coupled to more than one receiver, this system can be expanded to provide an accurate cross-sectional view of the temperatures across the entire gas path. This information is frequently useful for burner tuning, NOx reduction and similar objectives

Specifications

• Provides true, full width measurements to an absolute accuracy of +/- 25F @ 2500F with a range of 0 ˇV 4000F.
• Generates a high-energy sound pulse (185 dB) utilizing standard plant electric and service air (110 VAC & 80 psi @ 10 scfm).
• Uses NEMA4 enclosures and meets all electrical and safety standards 4 ˇV 20 mA data outputs

Features

• Avoids distortion from distance, reflection, and soot blower noise.
• Uses long-lasting rugged components for reliable operation.
• Uncompromised repeatability: day to day ˇK year to year.
• Traces the occurrence and development of boiler tube leaks.
• Ideal for trending long term boiler changes from PRB fuel switching.
• Requires no calibration, cleaning, or routine maintenance.
  „h Ease of installation using modular components.
  „h Multi-functional control platform for system upgrade and expansion.