Concept explainers
(a)
Interpretation:
Explain whether a fuel air mixture that is too lean or too rich will ignite.
Concept introduction:
It is given that the lower flammability and upper flammability limits of propane is 2.3 mole% and 9.5 mole%.
The gas mixture of propane will burn if the propane mole percentage is within this range. The mixture will not burn if the percentage is not within this range.
(b)
Interpretation:
Calculate the minimum molar flow rate of the diluting gas.
Concept introduction:
It is given that the lower flammability and upper flammability limits of propane is 2.3 mole% and 9.5 mole%.
The gas mixture of propane will burn if the propane mole percentage is within this range. The mixture will not burn if the percentage is not within this range.
In addition,
Total material balance at steady state can be written as,
Materials into the system = Materials out of the system
(c)
Interpretation:
Estimate the ratio of diluting air to fuel gas and the percentage of propane.
Concept introduction:
It is given that the lower flammability and upper flammability limits of propane is 2.3 mole% and 9.5 mole%.
The gas mixture of propane will burn if the propane mole percentage is within this range. The mixture will not burn if the percentage is not within this range.
The actual diluting air is given as 130% of the minimum value.
In addition,
Total material balance at steady state can be written as,
Materials into the system = Materials out of the system
(d)
Interpretation:
Explain why feeding air rate is greater than the minimum value.
Concept introduction:
It is given that the lower flammability and upper flammability limits of propane is 2.3 mole% and 9.5 mole%.
The gas mixture of propane will burn if the propane mole percentage is within this range. The mixture will not burn if the percentage is not within this range.
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