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Device and method for measuring mercury in flue gas based on low-temperature plasma pyrolysis

A low-temperature plasma and plasma technology, applied in the direction of measuring devices, separation methods, sampling devices, etc., can solve the problems of lack of measurement of particulate mercury, difficult conversion, interference, etc., and achieve simple and accurate mercury concentration , the effect of easy operation

Pending Publication Date: 2022-01-21
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

Theoretically speaking, particulate mercury can also be converted into elemental mercury for analysis and determination like oxidized mercury, but due to the interference of pipeline transmission and particulate matter such as smoke and dust, this conversion is difficult to achieve in actual operation
At present, the flue gas mercury online monitoring technology does not have the ability to measure particulate mercury, so the mercury continuous monitoring technology in the usual sense is only the continuous monitoring of the gaseous total mercury concentration

Method used

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  • Device and method for measuring mercury in flue gas based on low-temperature plasma pyrolysis
  • Device and method for measuring mercury in flue gas based on low-temperature plasma pyrolysis
  • Device and method for measuring mercury in flue gas based on low-temperature plasma pyrolysis

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Embodiment Construction

[0036] The present invention is described in further detail below in conjunction with embodiment.

[0037] Such as figure 1 , figure 2 Shown: Mercury in flue gas is divided into three forms: elemental mercury Hg 0 , Oxidized mercury Hg 2+ and particulate mercury Hg p , the existing mercury online testing system can only directly test elemental mercury, while oxidized mercury must be reduced to elemental mercury through a conversion system before it can be monitored. The current online detection system needs to filter the smoke and then detect the elemental mercury in the flue gas, but cannot measure the particulate mercury, and the oxidized mercury in the flue gas must be converted into elemental mercury for measurement. At present, the conversion methods of oxidized mercury are mainly chemical method and pyrolysis method. The chemical method uses reducing chemical reagents such as SnCl 2 Or the photocatalytic method, and the pyrolysis method is to convert the oxidized m...

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Abstract

The invention discloses a device and a method for measuring mercury in flue gas based on low-temperature plasma pyrolysis. The device comprises a sampling unit, a pretreatment system, a mercury analyzer, a calibration unit and a data acquisition and transmission system. The sampling unit is used for collecting sampled flue gas, pyrolyzing and releasing mercury in particulate matters and mercury in an oxidation state in the flue gas during sampling, and converting the mercury and the mercury into elemental mercury; the pretreatment system is used for controlling the sampling mode of the sampling unit to be dynamic pressure tracking sampling; the mercury analyzer is used for measuring the concentration of mercury in the sample; the calibration unit is used for converting a mercury standard substance with known concentration into Hg < 0 > and then inputting the Hg < 0 > into the mercury analyzer for detection through a gas circuit; and the data acquisition and transmission system is used for acquiring, storing and transmitting data obtained by the mercury analyzer. The device has the characteristics of simple structure, rapidness and stability.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation environmental protection monitoring, and in particular relates to a device and method for measuring mercury in flue gas based on low-temperature plasma pyrolysis. Background technique [0002] The development of promising mercury control and on-line monitoring technology to effectively remove mercury in gas is one of the urgent problems to be solved in environmental air pollution control. [0003] At present, the common sampling analysis methods mainly include EPA 29, EPA 101A, EPA30B and Ontario-Hydro methods. These methods require sampling before continuing to measure. The process is relatively complicated, and all of them require sampling after the particulate matter treatment device. There are three main forms of mercury in flue gas: elemental mercury Hg 0 , Oxidized mercury Hg 2+ and particulate mercury Hg p , the existing mercury online testing system can only directly te...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N21/31G01N21/64B01D53/64B01D53/32B01D53/00
CPCG01N1/2247G01N21/3103G01N21/6404B01D53/32B01D53/64B01D53/005G01N2001/225B01D2257/602B01D2259/818
Inventor 赵元财赵帅王慧青徐远纲赵永坚孟勇
Owner XIAN THERMAL POWER RES INST CO LTD
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