Active carbon absorbent for removing mercury in flue gas

Abstract

The invention aims to provide an active carbon absorbent for removing heavy metals especially mercury in flue gas and a preparation method thereof. By improving the preparation method of active carbon, the ratio of mesoporous pore canals in active carbon is increased, thus the oxidant load capacity and dispersion degree of active carbon are both improved; the performance of active carbon on absorbing mercury is enhanced, thus the mercury can be removed more easily, and moreover, the provided method has little pollution and can be applied to the industry.

Description

Technical field [0001] The invention relates to an activated carbon adsorbent for removing heavy metals in flue gas and a preparation method thereof, belonging to the field of air purification. Background technique [0002] As the main energy source of our country, the flue gas produced by coal contains a lot of heavy metals. These harmful or potentially harmful trace elements will be discharged into the atmosphere in different forms, causing a certain degree of air pollution. Although the content of harmful metal elements in coal is very low, due to the huge consumption of coal, its harm to the environment cannot be ignored. The "Clean Atmosphere Amendment" (CAAA) regulation, an amendment to the Air Purification Regulation passed by the US Congress in 1990, focused on strengthening the emission control of metal hazardous gas pollutants (HAP), mainly Hg, Cd, Pb, Cr and As, etc. . Among the 11 metals listed in the bill, mercury ranks first among toxic metals in terms of emission...

AI Technical Summary

Problems solved by technology

[0007] However, since the pore size distribution of activated carbon is mainly concentrated in the micropore area, and the micropores are too small for the oxidant molecules, it is difficult for the oxidant to enter the inner pores of the activated carbon, so the oxidant loaded on the activated carbon is only deposited on the surface.