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Module 2: Characteristics of Gases - Oxygen Basis Conversions - Practice Problems
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Instructions:
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Work these problems on a sheet of paper and check your answers against those provided below.
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Helpful Calculators:
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The following calculators may be useful in solving these problems. You can access them either from the "Calculators" button on the screen or from the links below.
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Correction of Concentration (Measured
Standard O2 Basis)
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Correction of Concentration (Wet Dry Basis)
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Concentration Converter (Minor Gas Constituents)
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#1
- The concentration of formaldehyde in a gas stream is measured at 1.3 ppmvd. The gas stream oxygen concentration during the measurement was 13.6%. What is the formaldehyde concentration expressed on a 7% basis?
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Answer: 2.48 ppmvd
- Solution:
- Solution:
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#2
- The concentration of benzene has been measured at 100 µg/m3. What is the concentration expressed on an 11% O2 basis if the measured oxygen concentration in the gas stream was 3.1%?
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Answer: 55.6 µg/m3
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- Solution:
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#3
- The concentration of sulfuric acid vapor in a gas stream has been measured as 7 ppm. What is this concentration expressed at 7% O2 if the measured oxygen concentration was 10%?
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Answer:
- Solution:
- Solution:
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#4
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An emission test has determined that the emissions of hydrogen chloride (HCl) vapor from an industrial process are 10 mg/m3. Is the source in compliance with the regulatory limit of 15.0 mg/Dm3 at 7% oxygen if the following conditions existed during the test?
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Answer: Yes, the source is in compliance with the hydrogen chloride emission limit of 15.0 mg/Dm3) at 7% oxygen.
- Solution:
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Convert the emissions data to a dry basis.
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Convert the dry concentration to a 7% oxygen basis.
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- The source is in compliance with the emission limit of 15.0 mg/Dm3 at 7% O2.
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#5
- An SO2 emission test has indicated that the outlet concentration from a wet scrubber is 5 ppmvd. Is the wet scrubber meeting the manufacturer's guarantee of 25,000 µg/m3 at 7% oxygen? The oxygen in the gas stream during the test was 11.5%.
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Answer: Yes, the scrubber SO2 emissions satisfy the manufacturer's guarantee. The SO2 concentration is 19,700 µg/m3 at 7% oxygen level.
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- Solution:
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Convert the SO2 ppmvd level to 7% oxygen.
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Convert the SO2 concentration at 7% oxygen from ppm to micrograms per cubic meter.
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Where: MW of SO2 is the molecular weight of SO2 expressed as lbm/lb mole
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- Yes, the scrubber SO2 emissions satisfy the manufacturer's guarantee. The SO2 concentration at 7% oxygen level is less than 25,000 µg/m3.