The iPOG™ is a free, user-friendly software package that accurately estimates Hg removals and emissions rates for broad ranges of coal quality, the most common configurations for furnace firing and flue gas cleaning, and inherent and external Hg controls. It supports coal cleaning and blending, Hg removal in units for NO_X and SO_X control, and activated carbon injection (ACI) and halogen addition. This flexibility is compounded by minimal input data requirements and extremely fast execution times. Being based on statistical regressions of an American Hg field test database and streamlined input data requirements, iPOG™ cannot resolve differences among different Hg controls within the measurement uncertainties, or depict the distinctive features of particular gas cleaning systems. Such limitations are especially pronounced whenever SO_3 adsorption interferes with Hg removal via ACI, and also when distinctive SCR design specifications strongly affect extents of Hg~0 oxidation. Two case studies show its utility in addressing "What if…?" scenarios, in which the impact of adding Hg controls to existing cleaning systems can be quickly and conveniently evaluated.
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