Bubbling type ultrasonic atomized mercury valence transformation device and method

Abstract

The invention discloses a bubbling type ultrasonic atomized mercury valence transformation device and a method, and aims to efficiently transform mercury of oxidation state, which is in coal-fired flue gas and can not be measured easily, into mercury of element state, which can be measured easily. The device provided by the invention is characterized in that flue gas extracted in the field is treated by a bubbling type reactor, so that a great amount of micron-sized bubbles are generated; meanwhile, an ultrasonic atomization technology is used to treat stannous chloride hydrochloric acid solution, so that a great amount of micron-sized fog drips are formed; after the bubbles and the fog drips are combined, the contact area of sample gas and stannous chloride hydrochloric acid solution can be improved greatly; and meanwhile, a baffle plate is arranged to prolong the interaction time of sample gas and stannous chloride hydrochloric acid solution. According to the invention, the efficiency of transforming mercury of oxidation state into mercury of element state through a stannous chloride wet chemistry method can be improved to the utmost extent, the operation of continuously transforming mercury of oxidation state into mercury of reduction state on line under the condition of a laboratory and practical flue gas can be realized, and real-time, comprehensive and accurate measurement of mercury state in an on-line mode can be implemented.

Description

technical field [0001] The invention belongs to the field of heavy metal mercury measurement, and relates to a device and method for efficiently converting oxidized mercury which is difficult to measure in coal-fired flue gas into easy-to-measure elemental mercury. Background technique [0002] Mercury and its compounds are receiving widespread attention as a class of toxic and harmful substances due to their high volatility, atmospheric migration, bioaccumulation, and nerve damage. With the increasing consumption of coal resources in the world, coal-fired power plants have become the world's largest single source of anthropogenic mercury emissions. The United States, Canada, China, etc. have formulated relevant laws, regulations or industry standards for mercury emissions from coal-fired power plants, and research on various technologies to control mercury emissions from coal-fired power plants, such as adding removers to coal, activated carbon adsorbent tail flue injection...

AI Technical Summary

Problems solved by technology

The conversion efficiency of the high-temperature heating method depends on the choice of temperature and the purge of inert gas. Recently, the conversion temperature has been controversial, and the additional energy loss and the use of inert gas have also increased the complexity and cost of its use.

The stannous chloride wet chemical method can be carried out at room temperature, and the limitation of its utilization lies in the low conversion efficiency. How to achieve the required conversion efficiency in a limited time and space has become the key to the application of this method in industrial devices.

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