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Full text of "The Flow Of Gases In Furnaces"

DESIGN  OF HOT-BLAST  STOVES

311

of 62 and 4 volumes of N2- While this is not absolutely accurate,
it is sufficiently close for the purpose and saves considerable time
in computing. Table No. 6 summarizes the instantaneous
calorific intensities as read from the curves for different conditions.
Tables 6 and 8, Appendix X, give the data used in the computa-
tions of Table No. 5, both being abstracted from Les Sources
de UEnergie Calorifique by Damour, Carnot and Rengade.

TABLE 1

TEMPEKA.TURE ON CENTEB LINHE OP CHECKER. WALL LAID UP IN" STRAIGHT
PASSES IN" PEE CENT VALUE OF THE SURFACE TEMPER ATTIRE OP THE
BRICK. ALLOWING FOR THE CORNER EFFECT

Heating Period in Minutes, Wall Thickness
		15
	30
	45
	CO

Indies
	Millimeters
	Temperature on Center Line in Per Cent of Surface Temperature
			
2.0
	50
	99.0
	99.9
	99.99
	

2.5
	63
	94.0
	99.5
	99.9
	....

3.0
	75
	91.0
	99.0
	99.5
	....

3.5
	90
	80.0
	97.0
	98.5
	99.8

4.0
	100
	70.0
	93.0
	98.0
	99. />

4.5
	113
	59.5
	87.0
	-    96.0
	99.0

TABLE 2

TIME IN* MINUTES REQUIRED FOR THE CENTER LINU OF A WALL TO

GIVEN PERCENTAGE VALUES or^ THE SURFACE TEMPERATURE, A&LO-WING

FOR THE   CORNTER EFFECT

Center Line Temperature
		
	
	
	
	

in Per Cent of Surface
		
	
	
	
	

Temperature
		95
	90
	SO
	70
	(>()

Wall Thickness
		
	
	
	
	

Inclies
	Millimeters
	Time In Minutes
				
2.0
	50
	32
	26
	18
	14
	12

2.5
	63
	54
	42
	30
	24
	20

3.0
	75
	76
	56
	44
	32
	27

3.5
	90
	106
	82
	62
	50
	38

4.0
	100
	130
	104
	76
	62
	48

4.5
	113
	170
	134
	98
	78
	60