Percent Excess Oxygen Formula:
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Definition: Percent Excess Oxygen is the amount of oxygen in the incoming air not used during combustion and is related to percentage excess air.
Purpose: It helps in combustion analysis to determine the efficiency of the combustion process and ensure proper air-fuel ratios.
The calculator uses the formula:
Where:
Explanation: The formula calculates what percentage of oxygen in the incoming air exceeds what's theoretically needed for complete combustion.
Details: Proper calculation ensures efficient combustion, minimizes fuel waste, and helps control emissions in industrial processes.
Tips: Enter the total moles of air fed to the process and the theoretical moles of oxygen required. Both values must be > 0.
Q1: Why is 0.21 used in the formula?
A: 0.21 represents the mole fraction of oxygen in air (21% oxygen by volume in atmospheric air).
Q2: What's a typical percent excess oxygen range?
A: Most combustion systems operate with 2-10% excess oxygen for efficiency and safety.
Q3: How is this related to percent excess air?
A: Percent excess oxygen is directly proportional to percent excess air, since oxygen content in air is constant.
Q4: What if I get negative values?
A: Negative values indicate insufficient air for complete combustion (oxygen-deficient conditions).
Q5: How do I find theoretical oxygen requirements?
A: Theoretical oxygen is calculated from stoichiometric equations of the combustion reactions.