Skip to main content

Full text of "The Flow Of Gases In Furnaces"

See other formats



flame and the cooler gases with which they come in contact.
Immediately below the roof of the kiln the hot gases are
relatively at rest. The burning of bricks does not permit
of sudden or quick changes of temperature, as bricks will
crack and spawl if subjected to such changes; therefore it
would not be advantageous to use a kiln which worked in this

By still further obstructing the smoke hole of the kiln, the
lower surface of the layer of hot gases can be driven downward


FIG, 3.



until it comes into contact with the sole of the kiln, thus giving
the maximum efficiency which is possible with kilns working on the
updraft system. Under these conditions, the brick can be burned
to an extent which is fairly satisfactory, but they will not be of
extra good quality, because, in spite of all, the currents of hot
gases have a tendency to flow directly to the highest opening.
The equalization of the temperature will be affected very little by
the eddy currents which will be formed. These eddy currents
will be of very slight intensity when the hot gases in the kiln are
as shown in Fig. 1, but nevertheless they do not disappear entirely