Flue Gas Monitoring And Dynamic Spiking For Sulfur Trioxide/Sulfuric Acid
First Claim
1. A system for monitoring sulfur trioxide/sulfuric acid levels in an emission stream flowing through an exhaust, the system comprising:
- a probe positionable relative to the exhaust to be able to extract essentially simultaneously a first supply train of sample gas from the exhaust and a second supply train of sample gas from the exhaust;
means for measuring sulfur trioxide/sulfuric acid content in the first supply train;
means for supplying SO2 gas of a known quantity to a catalyst, converting that SO2 gas that has been supplied to the catalyst to SO3 gas, spiking the second supply train with the catalyst converted SO3 gas to create a spiked train, and then measuring sulfur trioxide/sulfuric acid content in the spiked train;
whereby the system is configured such that a comparison of the measuring can help validate the system.
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Abstract
Systems and methods are disclosed for measuring sulfur trioxide/sulfuric acid content of flue gas. A probe is provided that extracts two separate lines of gas samples simultaneously from the flue gas. One of the two lines is dynamically spiked with a known quantity of sulfur trioxide, preferably generated in the probe. A comparison of sulfur trioxide/sulfuric acid content measurements from the spiked and unspiked lines helps identify and adjust for inherent biases in the measuring system. Also disclosed are catalyst structures and methods for use thereof for generating sulfur trioxide at known concentration.
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Citations
8 Claims
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1. A system for monitoring sulfur trioxide/sulfuric acid levels in an emission stream flowing through an exhaust, the system comprising:
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a probe positionable relative to the exhaust to be able to extract essentially simultaneously a first supply train of sample gas from the exhaust and a second supply train of sample gas from the exhaust; means for measuring sulfur trioxide/sulfuric acid content in the first supply train; means for supplying SO2 gas of a known quantity to a catalyst, converting that SO2 gas that has been supplied to the catalyst to SO3 gas, spiking the second supply train with the catalyst converted SO3 gas to create a spiked train, and then measuring sulfur trioxide/sulfuric acid content in the spiked train; whereby the system is configured such that a comparison of the measuring can help validate the system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of monitoring sulfur trioxide/sulfuric acid levels in an emission stream flowing through an exhaust, the method comprising:
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placing a probe relative to the exhaust so as to extract essentially simultaneously a first supply train of sample gas from the exhaust and a second supply train of sample gas from the exhaust; measuring the sulfur trioxide/sulfuric acid content in the first supply train; spiking the second supply train with a known quantity of SO3 gas; measuring the sulfur trioxide/sulfuric acid content in the second supply train after the spiking; and then comparing results of the measuring.
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Specification