Method for performing mercury removal treatment on boiler flue gas by utilizing coal ash-based mercury removal adsorbent

Abstract

The invention discloses a method for performing mercury removal treatment on boiler flue gas by utilizing a coal ash-based mercury removal adsorbent. The method comprises the following steps of: arranging the coal ash-based mercury removal adsorbent in a boiler flue for adsorbing mercury in the flue gas, performing desulfurization treatment on the flue gas subjected to mercury removal adsorption, and after the coal ash-based mercury removal adsorbent reaches the absorbing saturation, discharging the flue gas into atmosphere; and blowing out and collecting Hg2+ and a few amount of Hg0 adsorbed in the coal ash-based mercury removal adsorbent by using hot air, wherein the coal ash-based mercury removal adsorbent is prepared from the following raw materials in percent by weight: 5-15 percent of white mud, 10-15 percent of clay, 2-10 percent of cement and the balance of coal ash. The adsorbent is reasonable in formula, high-efficiency and economical; the coal ash-based mercury removal adsorbent is regenerated by employing a low-temperature regeneration technology; and moreover, the adsorbed mercury is independently treated in a centralized mode, and secondary pollution caused by introducing Hg into byproducts is avoided.

Description

technical field [0001] The invention relates to a flue gas mercury removal technology, in particular to a method for treating boiler flue gas with mercury removal by using a fly ash-based mercury removal adsorbent. Background technique [0002] Hg is a toxic heavy metal element, which can cause serious pollution to the environment when discharged into the environment. There are two sources of Hg emissions into the environment, natural emissions and man-made emissions, and coal combustion is the largest source of anthropogenic Hg emissions. Hg emissions from coal-fired power plants can account for 70% of man-made Hg emissions, and the average mercury content per kilogram of coal is 0.22mg. According to this calculation, the amount of mercury and its pollutants emitted by coal combustion is huge every year, which will cause serious harm to the ecological environment and human health. Once flue gas mercury enters the environment, it will eventually transform into highly toxic...

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Problems solved by technology

The results of the study showed that calcium-based substances such as Ca(OH) 2 , for HgCl 2 The adsorption efficiency can reach 85%; basic adsorbents such as CaO can also achieve good adsorption of HgCl 2 effect, but the adsorption efficiency of these calcium-based substances on elemental mercury is very low

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