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Balanced draught, also known as balanced draft, refers to a method of controlling the air supply and exhaust in a boiler furnace to maintain stable operating conditions. Here’s how it typically operates:
- Forced Air Supply: One fan, positioned below the furnace, forces air through the fuel bed or grate into the combustion chamber. This ensures that there is adequate oxygen for efficient combustion of the fuel.
- Exhausting Flue Gases: A second fan is located in the flue gas uptake, usually at the top of the boiler or furnace. This fan draws the combustion gases (flue gases) out of the furnace and expels them through a chimney or stack. By creating negative pressure in the flue gas system, it helps maintain a steady flow of exhaust gases.
- Pressure Regulation: The goal of balanced draught systems is to maintain near-atmospheric pressure within the furnace. This balanced pressure environment prevents disruptions in combustion caused by either excess air infiltration or insufficient exhaust. It ensures that the furnace operates efficiently and minimizes the risk of backdrafts or incomplete combustion.
- Applications: Balanced draught systems are commonly used in industrial boilers, power plants, and other large-scale combustion facilities. They offer precise control over air and gas flow, which is crucial for optimizing fuel efficiency, reducing emissions, and maintaining stable operating conditions.
In summary, balanced draught systems play a critical role in controlling the combustion process in boiler furnaces by balancing the forced supply of combustion air with the exhaust of flue gases. This approach helps achieve efficient and environmentally friendly operation of boiler systems.
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