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Full text of "The Flow Of Gases In Furnaces"

MT f

126

RATIONAL CONSTRUCTION OF FURNACES

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this purpose according to the Meyl system, as constructed in a
works in Russia. This furnace, in spite of its complexity and high
cost, was very unsatisfactory in operation. The annealing of the
material was very irregular, and ultimately it became necessary

to rebuild the furnace. The
drawing (Fig. 101) shows
clearly the cause of these poor
results; the hot gases in the
heating chamber rose from
the gas ports at the bottom of
the chamber to the waste-gas
ports at its top and for this
reason the iron pot in which
the coils of wire were placed
was not heated uniformly.

Moreover, the small amount
of space in the chamber did
not afford the possibility for
the development of the flame,

FIG, 101.

a portion of the gases being chilled below their ignition temperature
by the comparatively cold pot.

It is very evident that a furnace of this kind should be recon-
structed to work upon the downdraffc principle and in addition
should be furnished with a combustion chamber.

HORIZONTAL TEM-
PERING FURNACES

Fig. 102 shows a fur-
nace constructed accord-
ing to the Krupp system
for use in the heat-treat-
ing or tempering of shells
at a plant in Russia.
The Krupp Company
have adhered to the
system of heating the
material in the furnace
by heat radiated from
the roof. It may be                          FIG. 102.

seen by  this  ridiculous  construction how  far from  the  true

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