The Flow Of Gases In Furnaces

338

APPENDIX IX

setting and baffling boilers coupled with the design of the boilers
themselves. is well calculated to intensify combustion and soot
difficulties. At the same time the troubles with existing plant

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Length of Path of Gases from
Position of Tiernoocouple A, Feet
FlG. 171.
Curve showing temperature of the gases flowing through the B. <fe W. type boiler setting
shown in Fig. 170. The letters on the curve refer to pyrometer locations as indicated in
Fig. 170. Solid curves show temperatures indicated by pyrometer couples. Dotted
curve shows the computed temperatures from experimental data. Dash curve shows
computed velocity of gases. This curve is probably based on the assumption that the
flowing gases entirely fill the full area of the passage. As the basic assumption does not
agree with the action of the gases in this matter, the true velocity curve will be much
higher at certain points. Upper and lower diagrams show similar data for two different
initial temperatures.
may be considerably reduced by consideration of the laws govern-
ing the flow of hot gases.
In April, 1919, the Bureau of Mines issued their Bulletin
No. 145 on " Measuring the Temperature of Gases in Boiler