746
MODERN GASWORKS PRACTICE
and, thirdly, the sensible heat entering with the blast. The various sources in which this heat is dispersed are shown in the following table
Distribution of Energy per 1,000 Cubic Feet
B.Th.U. Equi valent in Pounds of Carbon.
A, heat of combustion of carbon 340,750 23-5
B, total heat in entering steam 18,359 1-266
C, sensible heat in entering blast 715 ■049
Total heat above 60° F. fed into apparatus on fuel account . 359,824 24-815
D, energy of CO in water gas 90,591 6-248
E, energy of H2 in water gas 108,908 7-511
F, sensible heat in escaping illuminating gas, vapours, etc. . 35,583 2-454
G, sensible heat in escaping blast products 70,838 4-885
H, heat lost by radiation from shells 12,454 •859
J, heat carried away from shells by conveetion 15,696 1-083
K, heat rendered latent in gasification of oil 21,393 1-475
L, sensible heat in ash and unconsumed coal recovered . 3,712 ■256
Total energy accounted for Unaccounted for (-18 per cent.) 359,176 649 24-771 •044
The final profit and loss account is, tlierefore, as follows:—
B.Th.U. Lb.
Energy utilized . . 220,892 15-234
„ wasted . . 138,283 9-537
„ unaccounted for 649 0-044
Total . 359,824 24-815
Assuming the unaccounted-for energy to be wasted, this leaves a heat efficiency of 61-4 per cent.
If the oil fed into the plant is taken into consideration as a furtlier source of heat the result will be somewhat modified. In Glasgow’s experiments 5 gallons of crude petroleum were admitted per 1,000 cubic feet of gas. The oil had a calorific power of approximately 18,500 B.Th.U. per 1b., and 5 gallons weighed 351b. There-fore:—
Heat entering with oil = 35 X 18,500 = 647,500 B.Th.U. Adding this to the above, the total energy supplied
= 359,824 + 647,500 = 1,007,324 B.Th.U. per 1,000 cubic feet of gas