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Draught Fans – Workhorses Of Industrial Processing Plants

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By Author: Neel Rao
Total Articles: 85
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A draught fan is a variety of industrial process fan, also called a blower, that is extensively used in factories of several sectors in the industry. These fans are among the most crucial elements in any factory/plant, and can hence be called workhorses of industrial processing plants. Draught fans can be further segregated into two sub-categories- FD (forced draught) fans and ID (induced draught) fans.

A forced draught fan brings in air from the external environment and pushes it inside the system with high pressure. Likewise, an induced draught fan gathers flue gasses that are there within the system and expels them into the outside atmosphere. Both these variants are of equal significance in an industrial plant. It will now be worthwhile to briefly elaborate upon some salient aspects of the subject at hand.

• Draught fans are of immense value in plants that are involved in generating thermal power. In these plants, the FD fans provide the air at the required pressure to the heating system to ensure that the process of combustion goes on smoothly. Similarly, the ID fans, by promptly removing the flue gasses, ...
... make sure that only a low level of contaminants is there within the combustion chamber.

The boiler’s inlet is the exact location where the FD fans are installed. And, an ID fan is found in the middle of the chimney and dust collector.

• A forced draught fan assures that there is never a shortage of fresh air inside the combustion chamber. With that, the right air-fuel ratio is optimally maintained, and this is pivotal for the efficient working of the system without compromising on safety. And, the basic functionality of ID fans mentioned above makes certain that the flow of air gets equally spread throughout the system.

• A forced draught fan can be used both as a primary air fan and a secondary air fan. Sometimes, there is a sudden requirement for extra air in the boiler for proper completion of the process. In these situations, the air provided by the primary fan won’t be enough. Here, the plant operates another FD fan that serves as the secondary air fan. At this point, it needs to be mentioned that most of the plants deploy secondary air fans only to handle contingencies; they aren’t operated regularly.

• As forced draught fans are helpful in ensuring that the fuel gets totally combusted, there is a marked decline in the volume of emissions. In the same way, because the FD fans continuously supply air to the system; the boiler’s capacity gets significantly enhanced.

• Both the forced draught and the induced draught fans related to a heating system work in coordination. As a direct result of that, the process inside the system progresses without any hassles.

• Numerous kinds of FD and ID fans are now available in the markets, to address the varying specifications of different plants. The exact draught fan that is suitable to be used in a given plant is dependent on the particular processes and kind of airflow needed. Whatever the need of a unit/factory, it will have no difficulty in obtaining the appropriate FD and ID fans.

Before draught fans are installed in a plant the management must have clarity about the corresponding, technical aspects & requirement. It is only then that the right blowers can be selected.

Reitz India is a leading manufacturer and supplier of premium Centrifugal Fans that find wide usage in heavy industrial applications. Reitz India has incorporated latest technology in PA Fan and SA Fan design and fabrication to provide energy efficient solutions with high quality manufacturing standards.

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