Answer / santosh raikar

Daught is nothing but the pressure difference between
furnace and atmosphere. there is two types of daught, one is
natural circulation and second is forced circulation. in
natural circulation the flue gases passes due to natural
pressure gradient exist due to temp and density difference.
in forced circulation a mechanical device is used to create
the pressure gradient, it may be fan/blower. and the
position also decide the type. if it is placed after the
furnace then it is termed as induced draught. and if it is
placed before the furnace then it will termed as forced daught.

this daught is to make to escape the flue gases from the
systum. in boiler force daught is used.

Answer / manisha

draught is like a pressure due to which flow of flue gases through chimney is takes place..........in a chimney induced draft is used.

Answer / magesh

Yes. The draft used is Induced draft. The draft is created
by a ID fan( Induced Draft). This fan sucks the flue gas
from the boiler furnace and forces out through chimney.
Usually the fan is controlled by a VFD where we can reduce
or increase the speed of the fan by adjusting the frequency.
As the power consumption of these fans are high, it is
better advisable to go with VFD( Variable Frequency Drive).
The technical specification of these fans can be googled.
Thanks.

Answer / pratik patel

The definations given by Mangesh and Santosh are right.
->the problem with the Forced daught boilers is that the
pressure in the Furnace is higher than the outside so when
there is leakage or if you open a inspection window the
flame will burst out.
->the problem with the Induce daught is that the pressure
is negative in the furnace. so there is a chance that
outside air can contaminate the furnace and combustion
through leakage or openings of inspection window.

--> so normaly balanced daught is used in which where both
fans (force daugth & induce daught fan) are provide one
before furnace and one after furnace.
these fans keeps the furnace pressure in balanced condition,
generally the pressure inside the furnace is kept negative
5-10 mm water column.

Answer / manish mudhliyar

DRAUGHT IS A DEVICE WHICH CREATES A PRESSURE DIFFERENCE TO
MAINTAIN THE FLOW OF ATMOSPHERIC AIR AND THE FLOW OF FLU
GASES.....

Answer / deepak

the difference of pressure is known as drought.
there are many type of drought we can use the drought
produced by means of chimney alone is known as chimney
drought.it is a natural drought

Answer / pinki tandan

Draught means a force-a force required to:
a.To remove the hot gases through the system
b.Maintain a flow of air through boiler combustion chamber.
c.To supply the flue gases to the atmosphere after heating water in the boiler.

Answer / ravi kumar singh

draught is like a pressure due to which flow of flue gases through chimney is takes place..........in a chimney induced draft is used.
there are two types of draught.1.natural draught,2. artificial draught

Answer / sherlock

When the fuel is burnt on the surface due to natural circulation of air, the draught is called natural or chimney draught.If the air is circulated with the help of fan driven by external source of power,the draught used is called artificial draught.

Answer / dharmendra singh

The pressure difference between furnace and atmosphere.generally drought is two types,first is natural and second is artificial.

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