Device for performing flue gas mercury concentration measurement by utilizing modified fly ash

Abstract

The invention relates to a device for performing flue gas mercury concentration measurement by utilizing modified fly ash. The device comprises a dust removal device, an adsorption tube, a temperature control device, a tail gas treatment device, a flow control device and an atmosphere control device. During measurement, flue gas sequentially flows through dust removal device, the adsorption tube and the tail gas treatment device. In the adsorption tube, gas-phase mercury in the flue gas is absorbed by a special modified fly ash adsorbent. The atmosphere of an adsorption environment is controlled by the atmosphere control device in the process that the flue gas passes through the adsorption tube. The temperature control is performed by the temperature control device in the process that the flue gas passes through the dust removal device and the adsorption tube. The content of the mercury in the adsorbent is analyzed by utilizing a neutron activation analysis method or the content of the mercury in a filtrate is analyzed by utilizing a cold atomic absorption spectrometry or a cold atomic fluorescence spectrometry after the adsorbent is leached with acid liquor. The device provided by the invention has the benefit that the adsorption atmosphere is controlled by adopting the atmosphere control device, so that the adsorption efficiency of the cheap adsorbent is improved, and while the cost is reduced, the flue gas mercury concentration measurement accuracy is ensured.

Description

technical field [0001] The invention relates to the field of flue gas mercury measurement in power plants, in particular to a device for measuring flue gas mercury concentration by using modified fly ash. Background technique [0002] Mercury is a highly toxic heavy metal pollutant that is stable at room temperature. Both mercury and its compounds are highly biotoxic and bioaccumulative, posing serious threats to human health and global ecosystems. At present, mercury emissions from coal-fired power plants are the main source of man-made mercury pollution, and mercury in coal-fired flue gas is mainly in the form of elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ) and particulate mercury (Hg p ). In order to control atmospheric mercury pollution, it is of great significance to monitor the mercury concentration in the flue gas of coal-fired power plants. [0003] Scholars at home and abroad have done a lot of work on the measurement of mercury concentration in flue ga...

AI Technical Summary

Problems solved by technology

Activated carbon has a good adsorption effect on mercury, but the cost is high, which is not conducive to popularization

[0006] Whether it is wet measurement or dry measurement, it is necessary to take samples on site and bring them back to the laboratory for analysis. The measurement time required is long, and the mercury concentration in the flue gas cannot be continuously detected.

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