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Full text of "The Flow Of Gases In Furnaces"

340

APPENDIX IX

Settings." The temperature curves plotted in this bulletin con-
firm in a very interesting manner the hydraulic laws governing the
flow of hot gases. The illustrations in this article are taken from
this bulletin and the only additional feature is that in three of the
figures lines have been added to show the flow of the hot gases
and soot pockets and the flow of the chilled gas in Figs. 170, 174
and 177 of this article (Figs. 2,4 and 6 of Bulletin 145).

Fig. 170 shows a gas fired type boiler installed at the Carnegie

FIG. 174.

Diagram showing flow of gases in single pass horizontally baffled boiler. Underfeed
stoker coal firing. Temperature measurements made in this boiler setting are shown in
curves, Figs. 175 and 176. By looking at this figure upside down the analogy to the flow
of water will be clearly observed. This type of baffling is particularly well adapted for
the formation of cool gas and soot pockets.

Institute of Technology. By turning this figure upside down it
will appear that the flow from the firebox falls on the inclined
baffle on the lower tubes and cascades over the end of the baffle
into and among the tubes, flowing under the top of the baffle.
This flow continues until the last baffle is overflowed and a cascade
is formed to the breeching. The hot gases being very much lighter
than the air have a tendency to rise. Relatively cooler gases will
have tendency to fall below hotter gases or stratify above colder
air or gas. Portions of the setting have been indicated as forming
cold or cool gas pockets while other portions are indicated as the