The Flow Of Gases In Furnaces

364

APPENDIX X

I;;

TABLE 6

HEAT RELEASED BY THE COMBUSTION OF THE PRINCIPAL COMBUSTIBLES AT
CONSTANT PRESSURE. WATER ASSUMED TO REMAIN AS VAPOR

B.t.u.

Substance
Molec-

Calories

Burned,
ular
Molec-
Reaction of Combustion

Per
per

Unit Weight or Volume
Formula
Weight
Formula
Per Pound
Per Cu.Ft
Ounce Mole-
Gram Molecule

cule

Hydrogen. . .
H2
2
H2 -f 0 . 5O2 = H2O
52,384
293.2
6,548
58.2

Carbon to CO
C
12
C+0.502 = CO
4,411
148.1
3,308
29.4

Carbon .
C
12
Q_i_Oo = CO
14,640
491.7
10980
97.6

Carbon mon-

oxide ......
CO
28
CO + 0.5O2 = CO2
4,366
343.6
7,673
68.2

Methane ....
CH4
16
CH4+202==CO+2H20
21,961
983.4
21,961
195.2

Acetylene. . . .
C2H2
26
C2H2 + 2 . 5O2 = 2CO2 + H2O
21,108
1536.0
34,300
304.9

Ethylene ....
C2H4
28
C2H4+3O2==2CO2+2H2O
20,545
1610.0
35,955
319.6

Ethane ......
C2H6
30
C2H6 + 3 . 502 = 2CO2 + 3H2O
20,392
1812.5
38,241
339.9

Benzene (gas)
C6H6
78
C6H6 + 7 . 5O2 = 6CO2 -f 3H2O
17,308
3779 . 2
84,380
750.2

Sulphur
S
32
S 4- O2 = SO?
3,893
348.6
7,785
69.2

Sulphur .....
S
32
S-f-1.5O2 = SO3
5,164
462.5
10,328
91.8

Evaporation

of water . . .
H2O
18

1,073
54 . 06
1,207
10.73

Low values are given for B.t.u. and calories released by different substances. Various
authorities differ on these values. The values given are from Les Sources de L'ttneryie
Calorifique, by Damour, Carnot and Rengade.