Question

An input stream of low quality coke (a solid carbonaceous fuel) flows into a furnace at a rate of 2150 lbm/hr. The coke contains 35% (w/w) atomic carbon, 20% (w/w) atomic sulfur, and remainder non-combustible ash, and it undergoes combustion in a furnace. A second input of gas is the source of oxygen and this stream contains 5% excess oxygen and little bit of inert nitrogen. The molar ratio of nitrogen to oxygen is 0.1.


The exit stream contains an un-reacted solid portion and the product gases. Analysis of the gas portion indicates that the selectivity of CO2 to CO in the reaction is 5.2. A flow-meter indicates that the gas portion has a total flow rate of 355 ft3/hr. A detector indicates that the combined mole fraction of the CO2 and CO in the gas is 0.329. An electrochemical analyzer that measures concentration of SO2 in the gas shows a reading of 474. The total absolute pressure of the exit gas mixture is found to be 97 atm.


Calibration data for the electrochemical analyzer that follows a power-law model is given below

C (gm SO2/L gas)	5	20	35	50	75
R	1	125	730	2248	8062

the molar volume of exit gas is 3.929 ft³/lbmol

the mass flow of the solid portion of product is 1448.4 lbm/hr

for exit gas, T(actual) - T(ideal) is approx. 50 K

Two choices, A and B, are correct

The three A-B-C choices are all correct

Answer 1