Selective catalytic reduction (SCR) systems rely on an accurate measure of the NOx molar flux to control the amount and distribution of ammonia reagent entering the reactor. The NOx flux usually is derived from a single-point NOx concentration measurement or look-up table value, and a calculated flue gas flow rate. The reagent flow then is trimmed based on a feedback signal from the NOx CEM to maintain the desired NOx emission. This control scheme results in unnecessarily high operating costs when inlet NOx deviates from expected values. ADA Environmental Solutions has devised a feasible means of adapting SCR sootblowers into movable sampling probes during the time that they are not needed for cleaning the catalyst. Feasibility tests will be performed at a utility boiler site in this Phase I project. The advantages of the SootSniffer technology (patent-pending) are quantified in terms of improved reagent usage, less downtime for air heater washes, improved flyash sales, and online tracking of catalyst reactivity. Supplemental
Keywords: small business, SBIR, monitoring, air emissions, engineering, chemistry, EPA. , Air, Ecosystem Protection/Environmental Exposure & Risk, RFA, Scientific Discipline, Chemical Engineering, Chemistry, Engineering, Environmental Chemistry, Environmental Engineering, Environmental Monitoring, Monitoring/Modeling, air toxics, tropospheric ozone, NOx control, NOx molar flux, Nitrogen Oxides, Nox, air pollutants, air quality data, air sampling, ambient air, ambient air quality, ambient monitoring, atmospheric monitoring, emission control strategies, emissions control, monitoring, nitrogen oxides (Nox) prevention
