An air pollution control system was installed at Dominion Generation’s Chesterfiled Plant in April 2008. The air pollution control system includes limestone injection, fabric filter, and a single absorber module to control emissions from the Chesterfiled plant’s number 6 boiler unit. The unit burns medium to high sulfur eastern bituminous coal. For sites such as this, a dry electrostatic precipitator has typically been used to control particulate emission. Recently, however, fabric filters have been installed at several installations to control particulate emissions under these conditions. With this type of emission control arrangement, ash loadings to the FGD are generally much lower than a typical dry ESP / Wet FGD arrangement. The are several advantages of operating a Wet FGD system with low ash loadings. Under this operating scenario, equilibrium inert / ash concentrations of the scrubber will remain quite low (usually under wt 2%) and absorber solids concentrations is mostly gypsum. Low concentrations of ash minimizes the potentialal of Wet FGD chemistry issues, such as aluminum fluoride blinding. Chemical analysis of the absorber slurries that are equipped with Fabric Filters upstream indicates lower concentrations of some dissolved metals, such as Selenium that is an important regulatory species. The low ash content of the FGD also results in very low gypsum moistures values (5% - 8%) to while operating with a typical hydroclone, vacuum filter system. Additionally, equipment wear is lessened as highly abrasive ash particles are not present in high quantities. SESS will present photos of absorber equipment from the most recent outage (September) 2010 at Chesterfield 6. Click Here For Complete Presentation Text
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