The stack gas from a furnace gas the following composition: 10.8% CO2, 0.20% CO, 9.0% O2, and 80% N2. These gases enter the stack at 760OF, at a draft of 0.5 inH2O. The proximate analysis of the coal burnt in the furnace is 1.44% moisture, 34.61% VCM, 57.77% FC, and 6.18% ash. Heating value of the green coal is 15,000 BTU/lb. This coal is also known to contain 0.78% sulfur and 1.3% N. The dry refuse contains 4% VCM and 21% FC. Air in supplied to the furnace has a temperature of 74OF, and is 65% saturated with water vapor. The barometric pressure is 29.1 inHg. Compute for the following (by establishing a 100 lbs coal as your basis): (a)Percent heat loss due to unburnt combustibles in the refuse (b)Percent heat loss due to potential heat losses (c)Percent heating value required to vaporize the total water vapor formed during combustion
The stack gas from a furnace gas the following composition: 10.8% CO2, 0.20%
CO, 9.0% O2, and 80% N2. These gases enter the stack at 760OF, at a draft of 0.5
inH2O. The proximate analysis of the coal burnt in the furnace is 1.44% moisture,
34.61% VCM, 57.77% FC, and 6.18% ash. Heating value of the green coal is 15,000
BTU/lb. This coal is also known to contain 0.78% sulfur and 1.3% N. The dry refuse
contains 4% VCM and 21% FC. Air in supplied to the furnace has a temperature
of 74OF, and is 65% saturated with water vapor. The barometric pressure is 29.1
inHg. Compute for the following (by establishing a 100 lbs coal as your basis):
(a)Percent heat loss due to unburnt combustibles in the refuse
(b)Percent heat loss due to potential heat losses
(c)Percent heating value required to vaporize the total water vapor formed
during combustion
(d)Percent heat loss as sensible heat
(e)Amount of heat available for steam production, assuming no other heat
losses through radiation, etc.
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