When analyzing the burner’s behaviour, the focus of attention is often on fuel supply, atomization, control behaviour and emissions values. However, experienced service engineers know: optimum air supply is crucial for a wide adjustment range, stable combustion and the best emissions values. This means it is vital to ensure that blowers, air ducts and controls are coordinated with one another.
There is therefore an optimum fuel to air supply ratio for every combustion process. The combustion plant operates with a stable flame, optimum efficiency and lowest emissions in this range. The challenge for service engineers lies in determining the optimum air ratio and setting the system on that basis.
The details of how the differences in terms of the fuel-air mixture can be best set vary according to the boiler manufacturer, type of fuel and control plan. Some burners control the quantity of air which is taken into the boiler, others the quantity of fuel and still more allow the setting of both parameters. In any case, it is important to know the exact oxygen content in the process to ensure reliable and cost-effective operation.