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Full text of "The Flow Of Gases In Furnaces"

102

RATIONAL CONSTRUCTION OF FURNACES



In a very large number of designs for hot-blast stoves the
attempt is made to circulate the hot gases in cooling and the
cold gases in heating, in directions contrary to their natural con-
vection currents.

The accompanying sketches of hot-blast stoves—Hartmann
(Fig. 65), Hugh Kennedy (Fig. 66), Macco (Fig. 67), Frank
Roberts (Fig. 68), Harvey (Fig. 69)—show that the laws governing
the subdivision of currents of hot gases while cooling and cold
gases while heating are not very well understood at the present
time.

Construction of the Combustion Chamber for a Hot Blast Stove.
—In the statements which follow, the attempt has been made to

Combustion Chamber

Fig. 65

• '    >' Plow of Products Combustion
-----^. u<]ow of Air

Fig. 66

K. 67

show the rational location of the combustion chamber for a hot-
blast stove. For this purpose it is necessary to digress slightly
at this point, in order to set forth the rational chamber conditions
which are necessary for combustion.
If a flame or jet of burning gases in which the reaction of
combustion has not been completed is directed into a cold chamber
or upon cold objects, combustion will not be completed, even in
the presence of an enormous excess of air. Theoretical combustion,
without an excess of air, can only be obtained when the reactions
of combustion are completed in a chamber where the flame is sur-
rounded by incandescent walls and within which it is held for
one or two seconds. The construction of the combustion chamber