What is a induced draft fan?

What is a induced draft fan?

An induced draught fan (ID fan) is provided to maintain a negative pressure in the furnace by sucking the products of combustion from it with a slight positive pressure at the discharge end vis-à-vis the bottom of the chimney/stack.

What are two advantages of an induced draft fan?

The advantages of induced draft fans are: The air flow is evenly distributed; Less noise; The space under the tube bundle can be used.

What is an induced draft system?

Induced draft: When air or flue gases flow under the effect of a gradually decreasing pressure below atmospheric pressure. In this case, the system is said to operate under induced draft. The stacks (or chimneys) provide sufficient natural draft to meet the low draft loss needs.

Why FD fan is used in boiler?

Forced Draft Fans (FD) supply the air necessary for fuel combustion by pushing air through the combustion air supply system and into furnace. These fans are located at the inlet of boiler to push high pressure fresh air into combustion chamber, where it mixes with the fuel to produce positive pressure.

Where are induced draft fans?

The induced draft fan is situated above the bundle, creating negative air pressure to draw the air through to the next step of the process, which could be another application like a dryer or an air treatment system for pollution control. It could also be the exhaust to the outside air.

What is the difference between ID and FD fan?

The key difference between a forced draft and an induced draft fan is, FD fan forces outside air into the heating system whereas an ID fan draws flue gases from the system out into the atmosphere.

What is difference between ID fan and FD fan?

What is the difference between an induced draft and forced draft evaporator?

Induced draft implies an inlet fan placed on top of the cooling tower and the creation of low pressure. Axial fans are always used for this type of draft. Forced draft means an exhaust fan placed at the base of the cooling tower which then causes overpressure.

What does inducer fan do?

The purpose of the inducer motor is to move air and gasses out of the furnace and up through the heating vents. This determines how much and how fast air will flow through the heat exchanger.

What is an induced draft fan in a boiler?

Induced Draft Fans or ID Fans removes flue gases from the combustion chambers and creates a vacuum of negative air pressure with a blower to suck the air out of the combustion chamber. These air or flue gases are discharged from the boiler through a stack or chimney.

What is the function of FD fan?

A forced-draft (FD) fan is a type of pressurized fan that gives off positive pressure within a system. It is mainly used in industries that employ boiler systems in order to promote boiler efficiency, but it has a wide range of applications.