The Flow Of Gases In Furnaces

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96

RATIONAL CONSTRUCTION OF FURNACES

It is comparatively easy to correct these regenerators in a
manner which will cause them to work better. Fig. 55 shows the

correction or change which
should be made. [This
change, however, does not
affect the frictional resist-
ance of this type of checker
work.] The hot gases enter
the top part of the cham-
ber and leave at the bot-

FIG. 56. torn; the height of the cham-

ber h may be calculated

according to the formula of Professor Yesmann in the same manner
as the height of the flues leading to the reversing valves; in this
way it is possible to design
these chambers of such a
height that the lower free
surface of the current of
gases will be at the level
of the bottom of the
chamber.

The checkers designed
by Dalen (a well-known
German designer of fur-
naces) show a construction equally erroneous (Figs. 56 and
57). Here the hot gases are conducted into the checker cham-
ber, not at the top, but below the middle of the chamber.

Such a regenerator heats
the gas nicely (Fig. 56),
but it works very in-
efficiently, because the
heated gases are very
light and the hottest
gases are trapped in the
upper part of the cham-
ber and cannot pass out
to the flues, while the
upper portion of the checker does not do any work at all and
forms a pocket filled with immobile heated gas.

Fig. 58 shows a horizontal regenerator constructed in a rational

FIG. 57.

FIG. 58.