Orange County NC Website
Browse       Search
• <br />n• <br />iRod:ant ElectmaG Semi -Dry Lime 8 <br />Nol io wale Reluse Scrubber Carbon <br />Feed Zone Sape+kaeater Turbine Added <br />Chute Ilurnace) GpneratorE Spark <br />Grapple Crane Oombusbun Steam <br />Crane Operator Chamber Evaporator Economrxer Feed ~Ammonia Lime <br />lines Tank 5'ila <br />�-( Carbon D.I rnihc <br />rill Slo Limp <br />'I — — - Sdo <br />Raghouee <br />Cooling <br />Towers <br />Tppma Floor _ r�su uu uu <br />Ammon a eo ier Water IndeRefuse HofdiN Pit n Infect on Treatment .usr w>4_ rmy Aar Fan <br />Marto Gaom tlC —� _Py :o� A+^ rc lamd6ll ��... <br />Grate Stoker Lime Continuoafs Waa a,c , Water <br />Surface Grate Addao Emissions _ I l_ -- -fi=r Yank <br />Moaironry <br />.nan <br />System paw. nil A nL iie::o-s uew�.ro w�^L <br />} y Refuse volume is reduced 1 g.1 LL {U <br />r r Refuse weight is reduced 4:1 <br />Figure B -2. Typical Mass -Burn Waterwall System4 <br />The off -gas exiting the boiler passes through an air pollution control system where <br />the majority of pollutants is removed and is discharged through a stack to the <br />atmosphere. Waste is burned out to an ash in the furnace. Heat extracted from the <br />waterwalls and the boiler section generates steam which, in most facilities, is <br />directed to a turbine generator for electric power production. Waterwall systems are <br />fabricated on -site. They are generally applied to larger systems, 200 TPD up to 750 <br />TPD, with multiple units used when higher capacity is required. They are forgiving in <br />their operation, and are reasonably efficient in the burnout of waste and in the <br />generation of energy. <br />1.1.2 Mass - Burn /Modular Combustion <br />Modular combustion is another incineration process. Unprocessed MSW is placed <br />directly into a refractory lined chamber. The primary chamber of the incinerator <br />includes a series of charging rams which push the burning waste from one level to <br />another until it burns out to an ash and is discharged to a wet ash pit, as in Figure B- <br />3. No or limited under -fire air is used to limit the entraining of ash into the flue <br />(exhaust) gas stream. <br />4 Source: Fairfax County, VA. <br />GBB/C08027 -01 B -5 August 15, 2008 <br />