A mercury removal method and device based on online activation of activated carbon

Abstract

The invention discloses a mercury removal method based on active carbon online activation and a mercury removal device based on activated carbon online activation. Low temperature plasma treatment is carried out on active carbon and high-activity gas, so that the high-activity gas is changed into high-activity atomic or ionic state by plasma and is loaded on the active carbon, an active site is formed on the active carbon, and further online activation of the active carbon is realized; and then the online activated active carbon is fed into a flue, so as to adsorb and remove mercury in flue gas in the flue, and further mercury removal treatment of the flue gas is realized. According to the mercury removal method and device, a method for online activating the active carbon by virtue plasma is utilized for obtaining modified active carbon, mercury removal efficiency of the active carbon is improved, and the advantages of short consumed time and convenience in treatment are realized.

Description

technical field [0001] The invention belongs to the field of mercury removal from flue gas, and more specifically relates to a mercury removal method and device based on online activation of activated carbon. Background technique [0002] Mercury is a trace heavy metal element with extremely neurotoxicity. It migrates and transforms between land and oceans around the world through discharge, deposition, and re-release. It has high volatility, easy migration, high bioaccumulation, and long-lasting It is a kind of global pollutants. Controlling mercury emissions is a common problem faced by the world, and mercury emissions from coal-fired power plants account for a large part of the man-made sources of mercury emissions. Mercury in the flue gas of coal-fired power plants mainly exists in three forms, elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ), particulate mercury (Hg p ). Among the three forms of mercury, elemental mercury (Hg 0 ) is the most difficult to be ca...

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Problems solved by technology

[0004] However, further studies have shown that the above-mentioned activated carbon chemical activation modification method and device still have the following disadvantages: 1) The operation steps of chemical activation modified activated carbon are complicated and time-consuming, and must be provided by a professional company. The content of active substances loaded on activated carbon far exceeds the amount required for activated carbon to adsorb and remove Hg in flue gas, resulting in a waste of chemically active reagents; 2) chemical activation is separated from activated carbon injection devices, which increases the cost of activated carbon injection , since the activated carbon after modification and activation is separated from the injection device, a corresponding activated carbon injection device needs to be added during use; 3) The properties of the injected activated carbon are single and fixed, and cannot change with the composition of the flue gas, and cannot adapt to the variability of the composition of the flue gas. Reduce the adsorption effect of activated carbon on mercury and increase the cost of mercury removal from flue gas

Therefore, the existing activated carbon injection device that cannot change the properties of activated carbon with the change of tail flue gas composition cannot guarantee an optimal mercury removal efficiency in different flue gas compositions, thus further increasing the cost of mercury removal

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