Notice of RetractionStudy on flyash characteristics and its effect on mercury removal in coal-fired derived flue gas

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

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In this paper, fly ash sampled at ESP inlet and outlet in a coal fired power station was analyzed, and its characteristics and effect on mercury removal were experimentally studied. It shows that particles consisted in the fly ash are mostly smaller than 50-100 μm , and some were even smaller than 10 μm. The main contents in the fly ash were attained through approximate and ultimate analysis. BET surface area, t-plot external surface area, single point adsorption total volume of pores, cumulative volume of pores, average pore width, and BJH average pore width were studied. This characteristics is the fundamental factors that can explain the effect of fly ash on mercury in the flue gas, and different fly ashes show significant differences in mercury removal. It was found that the fly ash can absorb mercury to a certain extent in the flue gas, mercury removal rate can reach 40% at maximum. About the influence factors, longer residence time and higher injection rate help improving mercury removal. It shows a higher mercury removal efficiency in compressed air than in flue gas. The temperature inside the duct also has effect on the mercury adsorption efficiency, and fly ash has higher adsorption efficiency at lower temperature.