13.7×0.24(480-81) = 1311 B. t. u.,
= 9.22 per cent.
(D) The loss due to incomplete combustion as evidenced by the presence
of CO in the flue gas analysis is:
0.11
----------×.7857×10,150 = 61. B. t. u.,
14.33+0.11 = .43 per cent.
(E) The loss due to unconsumed carbon in the ash:
The analysis of the ash showed 17.9 per cent to be combustible matter,
all of which is assumed to be carbon. The test showed 10.00 of the total
dry fuel fired to be ash. Hence 10.00×.179 = 1.79 per cent of the total
fuel represents the proportion of this total unconsumed in the ash and
the loss due to this cause is
1.79 per cent × 14,600 = 261 B. t. u.,
= 1.83 per cent.
The heat absorbed by the boilers per pound of dry fuel is 11.71×970.4 =
11,363 B. t. u. This quantity plus losses (A), (B), (C), (D) and (E), or
11,363+22+618+1311+61+261 = 13,636 B. t. u. accounted for. The heat
value of the coal, 14,225 B. t. u., less 13,636 B. t. u., leaves 589
B. t. u., unaccounted for losses, or 4.15 per cent.
The heat balance should be arranged in the form indicated by Table 58.