The Boiler: How Does It Work?
A boiler is a widely used component that allows engines to generate energy. The first known engine that used a boiler system is the Hero engine or aeolipile. It’s device that spins when the fluid inside the container below the shaft where it is attached to is heated. A fuel burns under the container to heat the water and produce steam. The steam then passes through the flue to rotate the aeolipile. The same principle applies to boiler systems of today.
A boiler is often seen in industrial and oil refinery plants. It is also found in homes with the heating system. It consists of a burner, combustion chamber, heat exchanger, and fuel source. The burner ignites the combustion in the boiler. It receives electronic signal from a thermostat or any temperature-sensing device to trigger fire on the fuel.
The fuel inside a tank placed next to the fluid vessel is sprayed into the boiler though the nozzle mounted on the burner. This maintains the fire needed to boil the fluid to produce sufficient steam. The steam produced exits the boiler and enters into the steam engine to initiate a mechanical work. The boiler needs to convert the chemical energy in the fuel to heat energy to heat up the water in the most efficient manner.
A boiler system aims to produce enough steam to provide energy to the engine and to absorb as much heat energy from the combustion chamber as possible. The heat efficiency of the boiler depends on the heat transfer method applied, which is based on the type of boiler used, the heat transfer surface, and the presence of an economizer system.
Depending on the type of boiler, heat can be transferred from the combustion chamber to the water inside the boiler through convection, radiation, or conduction. Direct fire water heaters are the best examples of combustion chambers, transferring heat through conduction when the container makes direct contact with fire. Its efficiency depends on the type of heat transfer surface used.
The economizer in boiler has no direct role in the combustion or heat transfer. However, it taps exhaust gas to preheat the water to be placed in the boiler. Because the water is already warm or hot before entering the boiler, boiling can be a lot easier, eventually increasing the heating efficiency of the boiler.
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