Device and method for quantitatively analyzing total mercury of atmosphere/smoke based on low-temperature plasma
A low-temperature plasma and quantitative analysis technology, applied in the direction of material excitation analysis, etc., can solve the problems of mercury residue in the detector, complex instrument structure, spectral interference, etc., and achieve the effects of low cost, guaranteed accuracy, and improved inspection sensitivity
Inactive Publication Date: 2012-07-18
QINGDAO JIAMING MEASUREMENT & CONTROL TECH
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[0029] The standard mercury source is used to calibrate the system, and the quantitative analysis model obtained has the advantages of wide linear range, good reproducibility and high detection sensitivity. Using this system to monitor a piece of anthracite in a briquette furnace from the beginning of combustion to the process of burning out (enrichment flow rate: 0.5L / min; enrichment time: 5min), the Hg contained in the obtained flue gas 0 The concentration range is: 2.7-60.8ppt.
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Abstract
The invention relates to a device for quantitatively analyzing total mercury of atmosphere / smoke based on a low-temperature plasma. The device comprises a thermocatalytic reactor (1), a gold amalgam enrichment device (2), a low-temperature plasma excitation source (3) and a spectrometer (5), which keeps in communication through a quartz tube, wherein the spectrometer (5) connected with the low-temperature plasma excitation source (3) through an optical fiber probe. The thermocatalytic reactor is contacted with air / smoke completely to convert Hg<2+> into Hg<0>. A certain amount of surface gold-plating quartz sand is filled in a gold amalgam enrichment pipe and can completely adsorb the Hg<0> in the gas at a normal temperature. High-purity Ar filled into the excitation source is excited by high-frequency high-voltage electricity applied to a ceramic pipe by a neon lamp power supply to form the low-temperature plasma with a large amount of high-density high-energy electrons. The plasma further excites the Hg<0> vapor, so that the 253.7-nm characteristic excitation spectral line is transmitted. The spectrometer records the intensity of the characteristic spectral line and establishes a linear model based on the intensity of the spectral line and the Hg<0> concentration so as to calculate to obtain the Hg<0> content of the atmosphere / smoke.
Description
technical field [0001] The invention belongs to the field of low temperature plasma (Low temperature plasma, LTP) quantitative detection of trace mercury concentration in the atmosphere / flue gas, specifically a gold amalgam online enrichment-external heating evaporation-low temperature plasma excitation method , Realize the quantitative analysis technology and instrument of trace mercury in the atmosphere / flue gas. Background technique [0002] The excitation source uses dielectric barrier discharge technology to excite Ar gas to generate low-temperature plasma. This type of excitation source has the advantages of low energy consumption (less than 10W), small size, low working temperature (room temperature), simple structure, and easy processing. Ideal excitation source for excitation and detection of medium and trace heavy metal pollutants. While the existing commercialized Hg in the atmosphere / flue gas 0 Measuring instruments are mostly expensive imported instruments, ba...
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IPC IPC(8): G01N21/62
Inventor 武中臣陶琳张鹏彦高心岗
Owner QINGDAO JIAMING MEASUREMENT & CONTROL TECH
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