However, if there is too much air, heat energy from combustion is used to warm the excess cold air, which reduces boiler efficiency. Reducing excess air is one of the most effective boiler improvement techniques. The lower the exhaust gas, the less heat loss. Flame temperature is raised, increasing radiant heat transfer in the combustion chamber walls. The increase of efficiency reduces stack temperatures.
Pollution is reduced because less fuel is required.
This is an excellent time to also have your boilers tuned-up. A good tune-up, using precision test equipment, can detect and correct excess air losses, unburned fuel losses, sooting, fire side fouling and high stack temperatures. When the tune-up is completed, there should be a good record of the boiler s excess air and efficiency across the entire load range, at all existing firing rates. Burner adjustment should be done only by a qualified technician who is knowledgeable about your specific burner and who has the necessary instrumentation to properly set combustion. Do not attempt to make burner adjustments on your own unless you have received proper training and possess the right instrumentation.