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Full text of "The Flow Of Gases In Furnaces"

COMBUSTION AND BOILER SETTINGS

341

location of eddies. Arrows indicate approximately the flow of the
cold and the hot gases. The pockets of relatively cold, chilled
gases form banks of soot and dirt. Letters on this figure designate
the points where the pyrometer couples were located.


	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
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Length of Path of Gasee from
Position of Thermocouple A, Feet
FIG. 175.
Curve showing temperature of gases flowing through single pass horizontally baffled
boiler. Positions of thermo-couple are indicated by letters in Fig. 174. Solid lines curve
show temperatures indicated by couples. Dotted" curve shows approximate computed
true temperatures, dash curve computed velocity of gases at different points. The velocity
curve, being probably based on the sectional area of the pass, is erroneous. Upper and
ower diagrams show similar data for two different initial temperatures.
Fig. 171 shows the curve of temperature drop through the
setting. One of the interesting features of this curve is the dif-
ference between the indications of the large and the small couples.
It is rather important that the pyrometer couple be suited to the