Chemistry Work.

**Q 1.**

A heater burns normal butane (*n*-C** _{4}**H

**) using 40.0 percent excess air. Combustion is complete. The flue gas leaves the stack at a pressure of 100 kPa and a temperature of 260**

_{10}**C.**

^{0}- a) Calculate the complete flue gas analysis.
- b) What is the volume of the flue gas in cubic meter per kg mol of
*n*-butane?

**Q 2.**

An incinerator produces a dry exit gas of the following Orsat composition measured at 60** ^{0}**F and 30 inches of Hg absolute: 4.0% CO

**, 26.0% CO, 2.0% CH**

_{2}**, 16.0%H**

_{4}**and 52.0% N**

_{2 }**.**

_{2}A dry natural gas of the following (Orsat) composition: 80.5% CH** _{4}**, 17.8% C

**H**

_{2}**, and 1.7%N**

_{6}**is used at the rate of 1200ft**

_{2}**/min at 60**

^{3}**F and 30 inches of Hg absolute to burn the incineration off gas with air. The final products of combustion analyze on a dry basis: 12.2% CO**

^{0}**, 0.7% CO, 2.4% O**

_{2}**, and 84.7%N**

_{2}**.**

_{2}Calculate (a) the rate of flow in ft** ^{3}**/min of the incinerator exit gas at 60

**F and 30 inches of Hg absolute on a dry basis, and (b) the rate of air flow in ft**

^{0}**/min, dry, at 80**

^{3}**F and 29.6 inches of Hg absolute.**

^{0}

**Q 3.**

Compute the mass of wet air required (theoretically) to burn 1 lb. of coal having the following composition:

Carbon = 66.10% Hydrogen = 6.03% Oxygen = 11.91%

Nitrogen = 1.04% Sulfur = 2.40% Ash = 12.52%

What would be the analysis of the dry flue gases produced?

If 20% excess air were supplied for combustion of this coal, and the coal was burned at a rate of 3 tons/hr., compute the required capacity of the fan (actual ft^{3}) to supply the combustion air. Assume the air to be at a pressure of 14.7 psi and temperature of 86°F. Assume that the air at 86 F contains 0.013lb of moisture per lb of dry air.