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Full text of "The Flow Of Gases In Furnaces"

HOT-BLAST STOVES

97

manner. The wall act, indicated by dotted lines, may be removed,
as it is useless.

The construction shown by Fig. 51 is very good; in this there
are two vertical regenerators placed side by side in place of a
horizontal regenerator. The correct direction is given to the
flowing gas currents. The main defect of these regenerators is
due to the frictional resistance which they offer to the passage of
the gases.

Regenerators in which the built-up checkerwork is replaced
by vertical channels or cells, constructed in a manner similar to
that used in the hot-blast stove designed by Withwell, are
considered in the section upon " Hot-blast Stoves."

III. HOT-BLAST STOVES

The regenerative principles of Siemens were applied by Cowper
in 1860 to the heating of the air for blowing blast furnaces, w At
first, however, these hot-blast
stoves were not a success.
Percy Wedding, in his Manual
of Metallurgy, shows some of
the early designs of hot-blast
stoves, one of which is given in
Fig. 59. The first stoves were
heated with coal fires; the gas
from the blast furnace was not
utilized until later. The hot

products  of  combustion   from

the fire flowed directly upward

to the top of  the  stove and

passed out of the structure through a primitive chimney valve

in the dome.   The cold blast entered the apparatus at the top and

(1) Note by translator.—The early blast furnaces were simple open-topped
shafts with no bell or hopper. The gas was burned at the head of the furnace,
and the blast pressure was very low. The charging was very elementary;
in many cases the top of the furnace was reached by an inclined plane up which
the charge was carted in simple dump-carts which were backed up to the open
shaft and dumped the charge into it. Later, when the bell and hopper were
utilized to close the top of the furnace the gas became available for heating
the blast and making steam. (The name, Hot Blast Stove, is a survival from
the early coal-fired stove.)