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Full text of "The Flow Of Gases In Furnaces"

106

RATIONAL CONSTRUCTION OF FURNACES

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wasteful, it is useful to direct the currents of gas and the cold
air for their combustion upward toward the dome of the stove
and give the combustion chamber an arrangement similar to that
shown in Fig. 73. There are many advantages in constructing
a hot-blast stove in this manner. In the Cowper hot-blast stove

the combustion chamber actually
occupies nearly 35 per cent of the
space inside of the shell and causes
an unnecessary increase of nearly
50 per cent in the cost of the
stove.

The analysis of this particular

FIG. 73.

FIG. 74.

case of combustion-chamber construction permits the following
rules to be deduced:
1.  The jet of flame in the chamber should not be directed
horizontally.
2.  The streams or jets of gas and air entering the chamber
should be, where possible, directed upward toward the dome or
roof.
3.  The products of combustion should be carried away from
the combustion chamber at the hearth level, in either a vertical
or a horizontal direction, as shown in Fig. 74.
Nevertheless, it is sometimes necessary that a vertical combus-
tion chamber should be used. In this case, it is not necessary to
repeat the error made by Cowper and construct the chamber as an
open pit (Fig. 70). It can be covered by an arch pierced by one or
Note by English translator.—Although Professor Groume-Grjimailo an-
nounced his theories over ten years ago they have not become very widely
known. Confusion and lack of knowledge still prevail among the designers
of hot-blast stoves. The direction of the natural convection currents of hot
gases in cooling and of cold gases in heating are ignored by the constructors
of three- and four-pass stoves.