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

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...

AI Technical Summary

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

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