Method and apparatus for monitoring mercury in a gas sample

A fluid sample and monitoring system technology, applied in measuring devices, separation methods, gas processing, etc., can solve problems such as wrong readings

Active Publication Date: 2008-10-15
THERMO ELECTRON A DE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, existing elemental mercury detectors using CVAAS measurement techniques give false readings

Method used

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  • Method and apparatus for monitoring mercury in a gas sample
  • Method and apparatus for monitoring mercury in a gas sample
  • Method and apparatus for monitoring mercury in a gas sample

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Embodiment Construction

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Abstract

A converter of the Continuous Emission Monitoring System (CEMS) receives a gas sample containing vaporized mercury from a probe. The converter converts oxidized mercury present within the gas sample into an elemental mercury component and an oxidizing component using thermal cracking. The converter also reduces the pressure of the gas sample to minimize recombination of the elemental mercury component with the oxidizing components. A mercury analyzer of the system receives the reduced pressure gas sample from the converter and detects the fluorescence of the elemental mercury within the sample. The mercury analyzer holds the gas sample at the reduced pressure to reduce an effect of fluorescence quenching on the fluorescence of the elemental mercury within the sample and provides substantially accurate measurement of the concentration of the elemental mercury in the gas sample.

Description

Method and device for monitoring mercury in gas samples technical field Embodiments of the present invention relate to monitoring mercury-containing compounds, and more particularly to monitoring gaseous emissions by converting mercury in such compounds to elemental mercury and employing fluorescence detection in combination with mechanisms to reduce fluorescence quenching in such compounds Mercury Monitoring for Mercury Content in Medium. Background technique Emissions from fossil fuel combustion facilities, such as coal-fired facilities and exhaust from municipal solid waste incinerators, include mercury. Emissions contain mercury vapor either as elemental mercury Hg0 or as a constituent of mercury-containing compounds such as oxidized mercury. Mercury oxide usually exists as mercury (Hg+2), such as mercuric chloride or mercuric nitrate. Due to the potential environmental hazards caused by mercury emissions, many countries have enacted or are considering regulations t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00
CPCC22B43/00B01D53/64B01D2257/602C22B7/001B01D53/30G01N33/0013G01N33/0045B01D53/346C22B7/02G01N21/6404Y02P10/20
Inventor 詹姆斯·H·格拉西戴特尔·基塔杰弗里·索查德克·阿佩尔
Owner THERMO ELECTRON A DE
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