68. The following coal has the following ultimate analysis by weight:

C = 70.5% H2 = 4.5% O2 = 6.0% N2 = 1.0% S = 3.0% Ash = 11%

Moisture = 4%

A stocker fired boiler of 195,000 kg/hr steaming capacity uses this coal as fuel. Calculate volume

of air in m3

/hr with air at 60°F and 14.7 air pressure if the boiler efficiency is 70% and FE = 1.10.

A. 234,019 m3 /hr

B. 215,830 m3/hr

C. 213,830 m3/hr

D. 264,830 m3/hr