A mixture of 75 mole % propane C3Ha and 25 mole % hydrogen is burnt with 25% excess air. The combustion of propane occurs according to the following two reactions: C3H8 + 5 O2 3 CO2 + 4 H2O C3H8 + 7/2 O2 → 3 CO + 4 H2O 1. Fractional conversions of 90% of the propane and 85% of the hydrogen are achieved; of the propane that reacts, 95% reacts to form CO2 and the rest reacts to form CO. The hot combustion product gas passes through a boiler in which heat transferred from the gas converts boiler feed water into steam. (a) Calculate the air feed rate

A mixture of 75 mole % propane C3Ha and 25 mole % hydrogen is burnt with 25% excess air. The combustion of propane occurs according to the following two reactions: C3H8 + 5 O2 3 CO2 + 4 H2O C3H8 + 7/2 O2 → 3 CO + 4 H2O 1. Fractional conversions of 90% of the propane and 85% of the hydrogen are achieved; of the propane that reacts, 95% reacts to form CO2 and the rest reacts to form CO. The hot combustion product gas passes through a boiler in which heat transferred from the gas converts boiler feed water into steam. (a) Calculate the air feed rate

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Problem 4
A mixture of 75 mole % propane C3HB and 25 mole % hydrogen is burnt with 25%
excess air. The combustion of propane occurs according to the following two reactions:
C3H8 + 5 O2 → 3 CO2 + 4 H2O
C3H8 + 7/2 O2 → 3 CO + 4 H2O
Fractional conversions of 90% of the propane and 85% of the hydrogen are achieved; of
the propane that reacts, 95% reacts to form CO2 and the rest reacts to form CO. The hot
combustion product gas passes through a boiler in which heat transferred from the gas
converts boiler feed water into steam.
(a) Calculate the air feed rate
(b) Calculate the unreacted propane and hydrogen in the stack gas
(c) Calculate the concentration of CO (ppm) in the stack gas
(d) The CO in the stack gas is a pollutant. Its concentration can be decreased by
increasing the percent excess air fed to the furnace. Give two cost related implications of
doing so.

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