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67 <br />1.1.1 Mass - Burn /Waterwall Combustion <br />In mass -burn waterwall combustion, MSW is placed directly into the system for <br />incineration with no pre - processing except for removal of identifiable white goods <br />(refrigerators, washing machines, microwave ovens, etc.). Waste is placed onto a <br />grate at the bottom of a combustion chamber in a furnace with walls built of water <br />tubes, as shown in Figure B -1. Air for combustion is forced through the grates <br />(under -fire air) and through parts in the sides of the combustion chamber (over -fire <br />air). <br />Figure B -1. Waterwall Furnace Section <br />Half the heat generated from the burning waste is absorbed by the waterwalls and <br />the balance heats water in the boiler, as shown Figure B -2. <br />3 Source: Babcock and Wilcox. <br />GBB/C08027 -01 B -4 August 15, 2008 <br />