Furnace Exit-Gas Temperature (FEGT) Measurement System
Continuously measure Furnace Exit-Gas Temperature (FEGT) using Non-Contact Infrared Sensors to optimize overall performance of boilers and furnaces under varying conditions of coal quality, load, ash fouling, and slagging.
- Prevent failures by proactively monitoring the furnace temperature
- Determine precisely when to perform soot-blowing
- Set trigger alarms to take quick corrective actions when gas temperatures approach slagging/fouling limits with continuous online monitoring
- Measure and quantify trade-offs of heat rate and NOx and SO2 emissions
- Optimize heat transfer by controlling FEGT under varying conditions
- Prevent unwanted slag accumulation at inlet pendants by controlling FEGT below ash fusion temperatures
- Reduce down time due to failures by prevention
- Easily install and maintain while boiler is online.
In many combustion processes, one of the main combustion gases is CO2. Therefore, measuring the CO2 gas temperature is a reliable measurement of the combustion temperature.
Our combustion monitoring solution is a cost effective system that utilizes the IPE 140/45 pyrometer. This is a pyrometer specifically designed for reliable “non-contact” temperature measurement of hot combustion gas containing CO2.
The system is easy to install and maintain even while the boiler is online. It allows for a very quick reaction to undesirable conditions with continuous online monitoring of the combustion temperature.
LumaSense’s FEGT solution includes
- Infrared Temperature Sensor
- Protective Sealed Jacket Assembly
- Protective Cooling Jacket
- Vortex Air Cooler
- Removable CaF2 Window Assembly (Window Slide)
- Air Purge Assembly
- Extended Site Tube
- Mounting Flange (Ball Flange)
- Air Filter for Vortex Air Cooler
The FEGT system can be integrated directly into a plants control system or as part of a more complete solution as shown here.
400 to 2000 ° C (MB 20)
|Spectral Range||CO2 absorption band for hot CO2 gas|
|Uncertainty (Tamb. = 25 °C, ε=1, T90 =1s)||Up to 1300 °C: 0.6% of reading in °C Above 1300 °C: 0.8% of reading in °C|
0.1% of reading in °C + 1 °C
interface and display: 0.1 °C,
< 0.03% of temperature range
|Analog output||linear 0 to 20 mA or 4 to 20 mA, DC, switchable; load max. 500 Ohm|
24 VAC/DC (14 to 30 VAC/DC)
(AC: 48 to 62 Hz)
|Power Consumption||6 VA|
Stainless steel enclosure with vortex air cooling (air only required for long-term monitoring)
|IP Rating (pyrometer)||IP65 (DIN 40 050)|
|Note: The pyrometer is able to measure hot combustion gas (with typically approx. 10% CO2 ) with a thickness of 40 cm.|
|Max. Temperature Purge Air||
75 °C (into cooler)
Max. ambient temperature enclosure
|FEGT System Weight||approx. 6 kg|
5 µm filter
|Ambient temperature||0 to 53 °C at pyrometer housing|
|Storage temperature||-20 to 60 °C|
|Relative humidity||Non condensing conditions|
|Cooling Capacity||440 Watts|
|Air Consumption @ 6.9 bar||708 slpm / male inlet|