Device and measuring method used for continuous measuring of content of mercury of different valence states in flue gas

Abstract

The invention discloses a device and a measuring method used for continuous measuring of the content of mercury of different valence states in flue gas. The device comprises a sampling device, a divalent mercury reduction system, a divalent mercury absorption system, and a mercury analyzer; one end of the sampling device is connected with a flue gas introducing pipeline, and the other end is connected with the divalent mercury reduction system and the divalent mercury absorption system in parallel via pipelines; and discharge pipelines of the divalent mercury reduction system and the divalent mercury absorption system are connected with the mercury analyzer. The device and the measuring method possess following advantages: operation is convenient and rapid, reliability is high, the content of mercury of different valence states and the content of total mercury in flue gas can be measured, and 24h continuous measuring of the content of mercury of different valence states in flue gas is realized.

Description

technical field [0001] The invention relates to the field of mercury content measurement in flue gas, and is a convenient and reliable measurement technology for measuring mercury content in various valence states in flue gas at the tail of a boiler, in particular to a device and measurement device for continuously measuring mercury content in various valence states in flue gas method. Background technique [0002] Heavy metal mercury (Hg) is secondary to particulate matter, NOx and SO in coal-fired power plants 2 The latter is the fourth pollutant that must be controlled. Hg is a trace element in the process of coal combustion, and its harm to the human body is cumulative. It can damage the human nervous system and cause permanent damage. Mercury in coal-fired flue gas presents three forms: zero-valent mercury (Hg 0 ), divalent mercury (Hg 2+ ) and particulate mercury (Hg P ), where Hg 0 It accounts for more than 70% of the total mercury in flue gas, of which Hg 0 It...

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Problems solved by technology

The difference between the two is that the 101A method uses a mixed solution of 4%wt potassium permanganate and 10% sulfuric acid to simultaneously adsorb zero-valent mercury and divalent mercury; the third method is the tris method, which is roughly the same as the US environment No. 29 method is similar, only replace the solution of 10%wt hydrogen peroxide·5%wt nitric acid in U.S. Environment Agency No. 29 method with hydroxymethylaminomethanol solution; the fourth is the Ontario method (OH method), The sampling system is more complex than the previous three methods

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