HEAT CAPACITY AND CALORIFIC INTENSITY CURVES 365
TABLE 7
AIR SUPPLY, OXYGEN REQUIRED AND PRODUCTS OF COMBUSTION OF THE
USUAL COMBUSTIBLES
This table is based upon the assumption that air = l volume of oxygen, 02-f-4 volumes
of nitrogen, N2. This assumption is sufficiently accurate for most purposes and greatly
simplifies the work of computation. If greater accuracy is desired, use 3.8 volumes for N2
and 4.8 volumes for air.
The volumes may be considered as cubic feet, cubic meters, ounce molecules or gram
molecules as desired for the purpose in hand.
Substance Burned, 1 Volume
Molecular
Oxygen Required,
d
Required
Products of Complete Combustion with Air.
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Hydrogen. . . . Carbon* to CO Carbon* ......
H2 C
CO CH4
C2EU
c2!6
S
s
2 12 12
28 16 26 28 30 78
32 32
0.5
0.5
2 0
2.5
1.0
2.0 2.0 4.0
2.0 8.0 10.0 12.0 14.0 30.0
4.0 0.0
3.0 3.0 5.0
3.0 11.0 13.0 10. 0 19.0 39.0
5.0 7.0
0.5 1.0
0.5 1.0
2.0 4 0
2.5 5.0
1.0
i 6
Carbon monoxide ......
'i.'o'
0.5 1.0 1.5 1.5
0.5 1.0 2.0 2.0 2.0 6.0
0.5 2.0 2.5 3.0 3.5 7.5
1 0
2.0 8.0 10.0 12.0 14.0 30.0
4 0
2.5 10.0 12.5 15.0 17.5 37.5
5 0
"s62"
1 0
1.0 1.0 2.0 2.0 2.0 6.0
'2.'6' 1.0 2.0 3.0 3.0
[Methane
Acetylene. . . . Ethylenc ..... Ethane. .
Benzene
Sulphur
Sulphur ......
1.5
6.0
7.5
1.0
* Carbon may be considered as a gas or as a solid.
TABLE 8
HEAT CAPACITY IN B.T.U. OP GASES MEASURED FROM 32° TO t = T—491
PEE CUBIC FOOT OF GAS
Temperature, Degrees F.
N2 = 28, O2 = 32, H2 = 2, CO = 28
H2O=18
C02 = 44
CH4 = 16
32
0.00
0.00
0.00
0.00
392
7.00
8.71
9.32
11.03
752
14.21
18.59
20.1
24.43
1112
21.71
29.57
32.44
40.4
1472
29.32
41.46
45.7
57.7
1832
37.43
55.31
62.57
79.44
2192
45.59
69.87
78.33
102.6
2552
54.05
85.64
96.5
128.2
2912
62.77
102.5
116.4
156.1
3272
71.58
120.2
137.1
180.6
3632
80.85
139.8
160.4
219.4
3992
90.22
160.3
184.6
254.6
4352
99.94
181.9
210.4
292.3
4712
109 . 87
204.6
237.6
3-32.7
5072
120
229.9
266.2
374.9
5432
130.4
255.1
296 . 5
419.8
Adapted from Les Sources de L'Energie Calorifique, by Damour, Carnot and Rengade.
NOTE.—AS CBU and other hydrocarbons (CnKxn) break up at low temperatures around
1450° F., their heat capacity is valueless and such gases cannot be preheated successfully.
Some data as to the dissociation of CH4 and C«HW were given on page 1014 of The Iron Age,
April 24, 1913.