Working Principle | Boilers Guide
Jan 13, 2015 · The idea is this: The system needs to control fuel and air as "the amount of fuel and air needed for this percentage load." So we convert fuel flow to percent by multiplying it by a constant. We convert the airflow to percent by running mass flow through a PWC to get raw percentage, then trimming that percentage from the output of the O 2 trim loop.
Ignition --This function is essential to combustion. There are several methods of accomplishing ignition in modern gas heating equipment: 1. Standing pilot systems have a pilot burner that is on all the time. 2. Intermittent pilot systems light the pilot on each call for heat. After the pilot is proved to be burning, the main burner is lighted. 3.
Dec 18, 2017 · When the thermostat calls for heat, the main gas valve activates so that pilot can light the main burners to generate heat. Thanks to safety devices within the unit, the; Electronic Ignition. Today, many modern furnaces rely on electronic ignition instead of a standing gas pilot.
Working Principle. Both gas and oil fired boilers use controlled combustion of the fuel to heat water. The key boiler components involved in this process are the burner, combustion chamber, heat exchanger, and controls. The burner mixes the fuel and oxygen together and, with the assistance of an ignition device, provides a platform for combustion. This combustion takes place in the combustion chamber, and the …
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In its most simple form, the air flow SP is the greater of the boiler master and the actual fuel flow PV (%) and the fuel flow SP is the lesser of the boiler master and the actual air flow PV (%, after it is run through the FAR PWC and O 2-trimmed). This forces air to lead on firing rate increases, and fuel to lead on decreases, and ensures that if the system ever runs out of air, it will never add too much fuel.