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Monitoring system and method of gas state total mercury in smoke

A flue gas and gaseous technology, which is used in measurement devices, preparation of test samples, instruments, etc., can solve problems such as regular maintenance, oxidation of elemental mercury, complex structure, etc., and achieve efficient conversion, low cost, and accurate measurement results. Effect

Active Publication Date: 2015-06-10
FOCUSED PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this method is that the addition of hydrogen causes newly generated HCl in the gas, and the HCl that is not absorbed by water and removed by condensation will cause elemental mercury to be oxidized
The structure of this kind of sample gas treatment device is very complicated, and because the cleaning liquid itself is a consumable, it needs regular maintenance; in addition, the use of liquid acid absorption also needs to consider the impact of gas-liquid separation efficiency on monitoring results

Method used

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  • Monitoring system and method of gas state total mercury in smoke
  • Monitoring system and method of gas state total mercury in smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The monitoring system of gaseous total mercury in flue gas according to the embodiment of the present invention. The monitoring system includes:

[0040] Sampling unit, filter unit and detection unit, these are the prior art in this field, do not repeat them here;

[0041] figure 1 A schematic structural diagram of the conversion unit 31 in the embodiment of the present invention is given schematically, as shown in figure 1 As shown, the conversion unit includes:

[0042] a gas container 312 having an inlet port and an outlet port;

[0043] A heating component 313, the heating component is arranged on the gas container; optionally, a thermal insulation material 314 is arranged around the heating component 313.

[0044] small hole 32, said small hole is arranged at the inlet end of said gas container;

[0045] The main body 33 is provided with a constriction hole 331 and an expansion hole 333 in communication, the constriction hole communicates with the outlet end, a...

Embodiment 2

[0055] An application example of the monitoring system and method according to Embodiment 1 of the present invention.

[0056] In this application example, the diluent gas expands rapidly after entering the expansion hole at high speed, thereby creating a negative pressure area at the expansion hole, so that the flue gas to be measured passes through the small hole at the speed of sound. The flue gas to be measured enters the quartz container and is heated to 900 degrees by the electric heating wire around the quartz container, and all the ionic mercury in the flue gas is converted into elemental mercury. The converted flue gas enters the shrinkage hole and the expansion hole at high speed and mixes with the dilution gas, and the temperature drops sharply to about 100 degrees, which prevents the recombination of mercury. The section perpendicular to the central axis of the contraction hole and the expansion hole is a circle, and the contraction hole and the expansion hole are ...

Embodiment 3

[0058] An application example of the monitoring system and method according to Embodiment 1 of the present invention.

[0059] In this application example, the diluent gas expands rapidly after entering the expansion hole at high speed, thereby creating a negative pressure area at the expansion hole, so that the flue gas to be measured passes through the small hole at the speed of sound. The flue gas to be measured enters the quartz container and is heated to 700 degrees by the electric heating wire around the quartz container, and all the ionic mercury in the flue gas is converted into elemental mercury. The converted flue gas enters the contraction hole and the expansion hole at high speed and mixes with the dilution gas, and the temperature drops sharply to about 150 degrees, which prevents the recombination of mercury. The section perpendicular to the central axis of the contraction hole and the expansion hole is a circle, and the contraction hole and the expansion hole ar...

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Abstract

The invention provides a monitoring system and a method of gas state total mercury in smoke. The monitoring system comprises a sampling unit, a converting unit and a detecting unit. The converting unit comprises a gas container, a heating component, a small hole, a body and a gas pipeline. The gas container is provided with an inlet end and an outlet end. The heating component is arranged on the gas container. The small hole is formed in the inlet end of the gas container. A shrinking hole and an expansion hole which are communicated with each other are formed in the body, the shrinking hole is communicated with the outlet end, and the expansion hole is communicated with the detecting unit. The included angle between the axis of the shrinking hole and the axis of the expansion hole is an obtuse angle. An outlet end of the gas pipeline is arranged in the shrinking hole. The monitoring system and the method of the gas state total mercury in the smoke have the advantages of being high in mercury conversion efficiency, low in cost, accurate in measurement, long in maintenance period and the like.

Description

technical field [0001] The invention relates to flue gas monitoring, in particular to a monitoring system and method for gaseous total mercury in flue gas. Background technique [0002] Mercury is a toxic heavy metal that often exists in fossil fuels and garbage, and then appears in the flue gas emitted during combustion or garbage incineration. Mercury discharged into the atmosphere is very harmful to humans and animals. Therefore, it is necessary to monitor the mercury content in flue gas and take timely control measures. [0003] At present, the monitoring of mercury usually adopts atomic absorption spectroscopic analysis method and atomic fluorescence spectroscopic analysis method, but both of them can only monitor elemental mercury in flue gas. Therefore, if the gaseous total mercury in the flue gas is to be monitored, all the ionic mercury in the sample gas must be converted into elemental mercury before the sample gas enters the optical analysis chamber. Pyrolysis i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/44G01N33/00
Inventor 柯亮杨铁军陈立波吴磊李若曦
Owner FOCUSED PHOTONICS