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O2 Trim-Control
Combustion Optimisation
Your advantages at a glance:
- Energy savings
- Reduces pollutant emissions (NOx, CO2, CO, etc.)
- Compensation for disturbances (e.g., air pressure, heating value fluctuations, etc.)
- Proven feedforward control for firing rate changes via adaptive correction/learning graphs
- High operational reliability
- Solid, low-maintenance, proven in operation
- An integrated PID O2 trim-control is available as an option for the LT1/LT2 lambda transmitter.
The O2 trim-control aims to optimize combustion and can compensate for various disturbances:
- Air pressure
- Temperature
- Calorific value
- Pollution
- Moisture
- Mechanical play
Disturbances can lead to significant changes in the residual oxygen content in the exhaust gas of an uncontrolled combustion system. This can potentially result in hazardous conditions for the system. An O2 trim-control maintains the oxygen level in the exhaust gases stable and compensates for nearly all disturbances.
Examples of the influence potential of the following disturbances:
| Disturbances of combustion | Typical fluctuations | O2 Change in Vol. % |
| Air temperature | ± 20 °C | ± 1,5 Vol. % |
| Air pressure | ± 25 mbar | ± 0,8 Vol. % |
| Calorific value | ± 10 % | ± 2,0 Vol. % |
A universal PID controller module is implemented in the LT1/LT2 and can be activated as an option. Alternatively, a fixed setpoint or a load-dependent setpoint curve can be set as the O2 setpoint. The setpoints and setpoint graphs can be entered for up to 4 fuels. The fuel specification is made via the digital inputs. The PID O2 trim-control compares the measured residual oxygen value in the exhaust gas with the setpoint and corrects the fuel/air ratio via the continuous controller output until the setpoint and actual values match. The controller output is advantageously connected to an electronic fuel/air composite control system. However, direct connection to an air damper or fuel control device via a servomotor with positioning electronics is also possible. In the event of burner start-up, malfunction, maintenance, etc., a fixed, parameterizable replacement value is output. Up to 4 limit values/limit value graphs can be activated for monitoring purposes, based on the specified setpoint graph.
Further downloads can be found in the support section.
