Method for performing flue gas mercury concentration measurement by utilizing modified high-sulfur petroleum coke

Abstract

The invention provides a method for performing dry-process mercury concentration measurement on power plant flue gas by replacing activated carbon with special modified high-sulfur petroleum coke adsorbents. The process of preparing modified high-sulfur petroleum coke comprises the two steps of Na2S solution activation and NH4Br solution modification performed on original petroleum coke. A special adsorption tube contains two sections of special modified high-sulfur petroleum coke adsorbents, namely an adsorption section and a penetration section in the flue gas flowing sequence. During measurement, the flue gas sequentially flows through the dust removal device, the adsorption tube and a water removal device. In the adsorption tube, gas-phase mercury in the flue gas is absorbed by the special modified high-sulfur petroleum coke adsorbents. The content of the mercury in the adsorbents is analyzed by utilizing a neutron activation analysis method or the content of the mercury in a filtrate is analyzed by utilizing a cold vapor atomic absorption spectrometry (CVAAS) or a cold vapor atomic fluorescence spectrometry (CVAFS) after the adsorbents are leached with an acid liquor. The method provided by the invention has the benefit that the expensive activated carbon is replaced with the special modified high-sulfur petroleum coke adsorbents, so that the dry-process flue gas mercury concentration measurement cost is effectively reduced.

Description

technical field [0001] The invention relates to the field of flue gas mercury measurement in power plants, in particular to a method for measuring flue gas mercury concentration by using modified high-sulfur petroleum coke. 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 conce...

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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