Retrofit of Waste-To-Energy Facilities Equipped with Electrostatic Precipitators: Vol. III, Test Protocol

Many municipal waste combustion facilities are equipped with electrostatic precipitators (ESPs); few have acid gas control systems. A retrofit technology using water spray temperature reduction combined with dry acid gas control reagent and powdered activatedcarbon (PAC) injection was tested. 2000 rng/dsm3 @ 7% O2 (150 ib/hr) of trona (a natural sodium sesquicarbonate ore) injected through arapid dispersion lance successfully controlled more than 50% of the acid gases. This should let facilities under 250 TPD meet the small plant guidelines for acid gas control. Various levels of PAC were injected along with the trona. 300 rng/dsm3 @ 7% O2 of PAC provides a comfortable margin between the emissions limitations achieved and both large and small plant regulatory guidelines fortetra-through octa-chlorinated dibenzo-p-dioxins and dibenzofurans and mercury, when ESP is operated below 350?F, Bi-fluid nozzles were used to spray finely atomized water between the economizer outlet and ESP inlet to maintain temperatures in the desired 300-350?F range. Particulate and metals emissions limitations were met by this 400 ft2/1000acft2 specific collector area (SCA)m 3-field ESP.Both the water sprays and PAC improved ESP performance. The proof-of-concept demonstration was successful.