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S--DIY EM d <br />r>tt F zwe S,g healer <br />�eeAt (Lars ) i..wama strA <br />GmPP* C.-WO Cow steam <br />G_ Owvaaor Ch~ Elccraw emart>aer Feed ,� -�A-0- Lime <br />Ears Ta* Soo <br />. .. .Carbon 0aWm <br />.$AO Lime. <br />7 <br />TWVFW <br />Carooft.e AomiAna Kain _ 1,4,.d Urtll <br />Refuse Hddp PA Ae Fro+ P7staon Teeadneb 5ow� de,1+. E.ar A..FM <br />.rx <br />Alum oob.�acs s.w'.m` ,a .wFd ' view <br />S � Aid E 1 MM ..... �`"mv1 !A T.* <br />Me4npa j �� <br />HldLLY YakerteL2dUCLC lU "i ^�y� <br />4m. Realse AEfAht K fldil�Q'A.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 />a Source: Fairfax County, VA. <br />GBB/C08027 -01 B -5 August 15, 2008 <br />