This paper mainly studied the removal of Hg by biomass activated carbon in the simulated flue gas. Biomass activated carbon of different materials were made through the control of activator concentration, activation temperature in the self-developed biomass preparation system. In the fixed bed system, the flue gas Hg removal efficiency of activated carbon samples were evaluated. The experimental results showed that the adsorption performance of biomass activated carbon was not proportional with the change of the activator concentration and activation temperature, the overall trend was firstly increased and then decreased.
The biomass carbons were studied with ZnCl2 as activating agent, methylene blue as index and its Hg adsorption experiment was conducted. The adsorption of soybean stem activated carbon for methylene blue was 149.84μg/g, and its adsorption capacity to Hg in flue gas in 4 hours was 14.57μg and penetration rate was 5.30% at the conditions of 600°C activation temperature, 90 min activation time and ZnCl2 concentration 50%, and the mechanism was analyzed.
To reduce mercury emission in the flue gas at coal-fired power plant, it is very important and meaningful to research the mercury content and the existing status of other elements in coal. In this paper, mercury and sulfur content including their relevant relations of existing speciations from five coal samples were studied. Experimental method was based on U.S. EPA Method 7471 and experimental apparatus was automatic mercury analysis system Hydra AA. The results showed that in these 5 coal samples, the range of mercury content was from 0.284μg/g to 0.663μg/g and the average content was 0.401μg/g. The range of sulfur content was from 0.688% to 5.546% and the average content was 2.30% . The existing status of mercury and sulfur in coal was very complex. Under normal circumstances, when there was high sulfur content in coal, there was also high mercury content. However, the low sulfur coal may be of high mercury content.
In this paper, Ca-based sorbent, Ca(OH)2 and CaCO3, was modified with different concentration of KMnO4 and their mercury adsorption capability in the flue gas was experimentally conducted by using a lab-scale multi-phase flow reactor system developed by Shanghai University of Electric Power, and the result showed that the removal efficiency of flue gas mercury of Ca-based sorbent was greatly improved with modification by different concentration of KMnO4, and the removal efficiencies were 80.92%,85.38%,82.35%,83.51% and 89.84% respectively. The removal efficiencies of Ca(OH)2 modified with KMnO4 is increased significantly may be because strong oxidation of KMnO4 made Hg0 convert into oxidized mercury, Hg2 +, which is easier to be removed, as well as, the modification by KMnO4 may change the surface properties of Ca(OH)2 so that it became more active to capture mercury in the flue gas.
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