Measurement of gas temperature distribution in combustion chambers

The FTD-2D system is used for online measurement of the temperature distribution in combustion chamber levels to optimise combustion operation and reduce emissions:

• Limit value monitoring of temperature avarage and maximum at the combustion chamber outlet to avoid slagging of the following heating surfaces or to comply with the minimum temperature according to BImSchV.
• Correction of extreme flame inclinations to avoid asymmetrical thermal heating surface loads and/or slagging of the combustion chamber walls
• SNCR control

Measuring principle

• Radiance measurement of the soot radiation of luminous flames, two spectral ranges (NIR) or radiance measurement of the CO2 absorption band.
• Tomographic determination of the temperature distribution with sensors arranged in a grid pattern

Realisation

• 6-12 Metis MF11 or Metis MY45 pyrometers arranged around the circumference of the combustion chamber.
• Robust components for reliable continuous operation in harsh industrial environments.
• Required measuring openings Ø≈15…40mm
• Industrial PC for measurement data recording, tomography calculation, display, archiving, alarm output and integration into the process control system.
• Low air consumption (approx. 2 m³/h per sensor)
• Time-delay-free measurement

 

Results

2D flue gas temperature distribution in the first radiation pass of an MVA.

Without correction or optimisation of the combustion

With correction via the secondary air based on the online measurement of the temperature distribution (FTD-2D)