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US 7,608,230 B2Granted
Sample conditioning system for removing selenium from a gas stream
AssigneeApogee Scientific, Inc.
InventorsScott E. McLaren, Kevin M. Fisher
Life of this patent
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Abstract
A sample conditioning system removes selenium from a flue gas sample to provide more accurate measure of mercury in the gas stream. Ammonia or another basic reagent is added to the sampled gas stream to increase the pH of the condensate, and thereby ensuring the removal of hydrogen selenide.
Claims9
A method for conditioning a flue gas stream to remove selenium prior to measuring mercury in the gas stream, said method comprising:
- adding a basic reagent to the gas stream to increase solubility of hydrogen selenide in water;
- and
- removing moisture and soluble gases, including hydrogen selenide, from the gas stream.
A method for measuring mercury in a flue gas stream comprising:
- adding a reducing agent to the gas stream to consume available oxidizing agents in the gas stream and convert oxidized forms of mercury in the gas stream to elemental mercury;
- adding a basic reagent to the gas stream to increase solubility of hydrogen selenide in water;
- removing moisture and soluble gases, including hydrogen selenide, from the gas stream;
- and
- measuring elemental mercury in the gas stream.
2 more elements
Dependencies are inferred from the claim text.