The stack gas from a boiler furnace contains 10.8% CO2, 0.2% CO, 9.0% O2, and 80.0% N2. These gases enter the stack at 760°F, at a draft of 0.5 in. of H2O. The proximate analysis of the coal burnt in the furnace is 1.44% moisture, 34.61% volatile matter, 57.77% fixed carbon, and 6.18% ash. Heating value of the coal is 14,350 BTU/lb. This coal is also known to contain 0.78% sulfur and 1.3% N. The volatile matter of the dry refuse is 4% and the fixed carbon 21%. Air in the boiler room has a temperature of 74°F, and is 65% saturated with water vapor. The barometer is 29.7 in Hg. Compute: a. Percent heat loss due to unburnt combustibles in the refuse b. Percent heat loss due to potential heat losses c. Percent of the heating value required to vaporize the total water vapor formed on combustion d. Percent heat loss as sensible heat e. Amount of heat available for steam production, assuming no other heat losses thru radiation, etc.
The stack gas from a boiler furnace contains 10.8% CO2, 0.2% CO, 9.0% O2, and 80.0% N2. These gases enter the stack at 760°F, at a draft of 0.5 in. of H2O. The proximate analysis of the coal burnt in the furnace is 1.44% moisture, 34.61% volatile matter, 57.77% fixed carbon, and 6.18% ash. Heating value of the coal is 14,350 BTU/lb. This coal is also known to contain 0.78% sulfur and 1.3% N. The volatile matter of the dry refuse is 4% and the fixed carbon 21%. Air in the boiler room has a temperature of 74°F, and is 65% saturated with water vapor. The barometer is 29.7 in Hg. Compute: a. Percent heat loss due to unburnt combustibles in the refuse b. Percent heat loss due to potential heat losses c. Percent of the heating value required to vaporize the total water vapor formed on combustion d. Percent heat loss as sensible heat e. Amount of heat available for steam production, assuming no other heat losses thru radiation, etc.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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The stack gas from a boiler furnace contains 10.8% CO2, 0.2% CO, 9.0% O2, and 80.0% N2.
These gases enter the stack at 760°F, at a draft of 0.5 in. of H2O. The proximate analysis of the
coal burnt in the furnace is 1.44% moisture, 34.61% volatile matter, 57.77% fixed carbon, and
6.18% ash. Heating value of the coal is 14,350 BTU/lb. This coal is also known to contain 0.78%
sulfur and 1.3% N. The volatile matter of the dry refuse is 4% and the fixed carbon 21%. Air in
the boiler room has a temperature of 74°F, and is 65% saturated with water vapor. The
barometer is 29.7 in Hg. Compute:
a. Percent heat loss due to unburnt combustibles in the refuse
b. Percent heat loss due to potential heat losses
c. Percent of the heating value required to vaporize the total water vapor formed on
combustion
d. Percent heat loss as sensible heat
e. Amount of heat available for steam production, assuming no other heat losses thru
radiation, etc.
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