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In an effort to reduce nitrogen oxide (NOX) emission, many coal-fired electric utilities employ NOx control devices that utilize ammonia injection; this process, although successful at reducing NOx, results in a fly ash with elevated concentrations of ammonia. The reuse of ammoniated fly ash (AFA) raises environmental concerns due to the potential for ammonia to leach from the fly ash and impact water...
Rice husk, a common agricultural waste and renewable biomass, was pyrolyzed and then impregnated with NH4Cl and NH4Br to develop an efficient sorbent for gaseous mercury removal from flue gas. The sorbents’ performance was first investigated in a fixed-bed system with N2 atmosphere at 150°C and then in an entrained-flow system with real coal-fired flue gas at 150°C. For comparison, a commercial coal-based...
A sol–gel synthesized Cu-promoted CeO2–TiO2 (CuCeTi) catalyst was used in the low temperature selective catalytic reduction (SCR) of nitrogen monoxide (NO) with ammonia (NH3). The combination of copper oxide (CuO) and cerium oxide (CeO2) improved SCR performance at low temperatures by increasing the dispersion of active species and the volume of surface oxygen (O2) with low-temperature activity. NO...
Hg 0 oxidation by chlorine over CeO 2 –TiO 2 (CeTi) catalysts with different CeO 2 /TiO 2 ratios was investigated both in the absence and the presence of SO 2 . Experimental data were analyzed using a kinetic model incorporating mass transfer, adsorption equilibrium and mass balance with key variables of interest being residence time, catalyst type and...
This study employed a laboratory-scale fluidized bed incinerator to investigate the formations and controls of hydrogen chloride (HCl) and polycyclic aromatic hydrocarbons (PAHs) by adding different additives in the feedstock during waste incineration. The effects of different organic and inorganic chlorides on the formation and control of HCl and PAHs were also studied. Additionally, the thermodynamic...
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