Impending regulations of mercury emission from coal-fired utilities are driving current efforts to develop efficient control technologies. This includes a comprehensive field test program that considers full-scale use of mercury control by injection of activated carbon upstream of a particulate collection device (baghouse or ESP). The present effort aims at numerical modeling of the in-flight mercury capture by adsorption using Computational Fluid Dynamics (CFD). Such a modeling capability enables optimization of sorbent injection strategies in order to better overcome mass transfer limitations. CFD provides detailed duct-scale information on the flow of flue gases as well as the dispersion of injected sorbent. Sorbent particle trajectories are determined using Lagrangian tracking, while a convective-diffusive transport equation describes the gas-phase mercury distribution. Mercury sink terms are defined based on a particle model for mass transfer and surface adsorption on an entrained sorbent particle. We present simulation results for the sorbent dispersion of large-scale field tests carried out at the Brayton Point power station in Massachusetts.
Computational Modeling of Mercury Control by Sorbent Injection
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Madsen, JI, Rogers, WA, & O’Brien, TJ. "Computational Modeling of Mercury Control by Sorbent Injection." Proceedings of the ASME 2004 Power Conference. ASME 2004 Power Conference. Baltimore, Maryland, USA. March 30–April 1, 2004. pp. 533-542. ASME. https://doi.org/10.1115/POWER2004-52099
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