1. Controls for Combustion Optimization Dr. Martin Bergemann Dipl. -Ing
Controls for Combustion Optimization Dr. Martin Bergemann Dipl.-Ing. Harald Petermann
February 27th 2014
Gas Sensor Workshop

2. February 27th 2014
Gas Sensor Workshop

3. The Association Afecor
is the association of the leading European controls manufacturers
has been established 1963
works to influence directives and standards ensuring safe, efficient and environment friendly use of primary energy sources.
holds seminars to exchange information between experts and stakeholders on legislation, technologies and market development
February 27th 2014
Gas Sensor Workshop

4. Safety Considerations Conclusions
Content
Standards
Sensor Types
System Examples
Safety Considerations
Conclusions
February 27th 2014
Gas Sensor Workshop

5. Combustion Control – Relevant Standards
Standards of CEN TC 58 "Safety and control devices for burners and appliances burning gaseous or liquid fuels“
EN Safety and control devices for gas burners and gas burning appliances – General requirements
EN Safety and control devices for burners and appliances burning gaseous or liquid fuels – Control functions in electronic systems – Methods for classification and assessment;
EN 298 Automatic burner control systems for burners and appliances burning gaseous or liquid fuels
EN Gas/air ratio controls for gas burners and gas burning appliances . Part 2: Electronic types
EN Combustion product sensing devices for gas burners and gas burning appliances;
EN 1854 Pressure sensing devices for gas burners and gas burning appliances
February 27th 2014
Industrieforum GAT

6. Sensor Types Ionisation Temperature Flue Gas O2,CO no extra sensor
low cost
contamination
drift
simple
moderate cost
accuracy (method)
implementation
accurate
wide range
high cost
aux. heating
February 27th 2014
Gas Sensor Workshop

7. Zirconium Oxide Sensor
Source: Lamtec
February 27th 2014
Gas Sensor Workshop

8. Combustion Control Residential Boiler
Source: Siemens
February 27th 2014
Gas Sensor Workshop

9. Performance Example Residential Boiler
Source: Viessmann
February 27th 2014
Gas Sensor Workshop

10. Oxygen Trim Control Commercial Dual Fuel
Source: Siemens
February 27th 2014
Gas Sensor Workshop

11. Combustion Control – Safety Considerations
The adaptive combustion control system has to be integrated into the safety concept of the gas burning appliance
If the sensor fails, the appliance has to return to a safe mode
For ionisation sensors a failure of the sensor leads to a safety-shutdown. Sensor deterioration is being compensated for as a matter of calibration cycles
For flue gas sensors which are not fail safe in itself or being supervised by other means, only a limited trim of the lambda value is possible
February 27th 2014
Gas Sensor Workshop

12. Conclusion
Combustion optimization solutions do exist for residential and commercial applications
Implementation of systems integrated into the combustion chamber often requires a lot of engineering, the cost of which often offsets the low price of the sensors
Systems measuring the flue will mostly do minor adjustments for safety reasons
Sensor development is underway so that less expensive solutions will become available in the next few years
February 27th 2014
Gas Sensor Workshop