Filter for determination of mercury in exhaust gases
AssigneePerma Pure LLC
InventorsTom A. Baldwin, John Ward, III, Allan Budd
Life of this patent
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Abstract
An apparatus, process, coating, and filter for the accurate measurement of total mercury concentration in flue gas. In one aspect, the concentrations of both elemental and oxidized mercury are preserved by the apparatus for analysis. Accordingly, embodiments of the present apparatus and process can be used to determine regulatory compliance or for process control measurement.
Claims19
An apparatus for measuring mercury concentration in a flue gas, the apparatus comprising a gas sample acquisition probe, a static filter, and an analyzer, wherein:
- the gas sample acquisition probe is configured to initiate transport of a gas sample from the flue gas to the static filter;
- the static filter comprises a porous filter element configured to remove particulate material from the gas sample and output a filtered gas sample;
- the analyzer is configured to measure the amount of gaseous mercury present in the filtered gas sample;
- the static filter comprises metal surfaces that are coated with a protective coating that reduces chemical reactivity of the metal surfaces to gaseous mercury;
- the chemical reactivity of the metal surfaces that is reduced comprises oxidation of elemental mercury to a chemically combined form of mercury and loss of oxidized mercury through adsorption on the metal surfaces;
- and
- the coated metal surfaces of the static filter are positioned to contact a gas sample flowing through the static filter.
An apparatus for measuring mercury concentration in a flue gas, the apparatus comprising a gas sample acquisition probe, a static filter, and an analyzer, wherein:
- the gas sample acquisition probe is configured to initiate transport of a gas sample from the flue gas to the static filter;
- the static filter comprises a porous filter element configured to remove particulate material from the gas sample and output a filtered gas sample;
- the analyzer is configured to measure the amount of gaseous mercury present in the filtered gas sample;
- the static filter comprises metal surfaces that are coated with a protective coating that reduces chemical reactivity of the metal surfaces to gaseous mercury;
- the chemical reactivity of the metal surfaces that is reduced comprises oxidation of elemental mercury;
- the gaseous mercury measured in the particulate free gas sample is selected from the group consisting of Hg+2, Hg0, and a combination thereof;
- and
- the coated metal surfaces of the static filter are positioned to contact a gas sample flowing through the static filter.
Dependencies are inferred from the claim text.