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o <br />J00,141 <br />Figure B -3. Typical Modular Combustion Systems <br />Less than the ideal (stoichiometric) amount of combustion air is injected into the <br />primary combustion chamber, and a combustible gas is produced from the <br />incomplete waste combustion. The gas from the burning waste is directed to a <br />secondary combustion chamber where additional air is added to complete the <br />burning process. Hot gases pass though a separate waste heat boiler for steam <br />generation and then through an air pollution control system before discharge through <br />the stack to the atmosphere. <br />A major advantage of this system is injection of less air than ideal in the primary <br />combustion chamber. With less air, the fans can be smaller and the chamber itself <br />can be smaller than with other systems. Also, with less air flow, less particulate <br />matter (soot) enters the gas stream and the air pollution system can be sized for a <br />smaller load. <br />Modular systems are factory built and can be brought to a site and set up in a <br />relatively short period of time. They are less efficient than waterwall units in waste <br />burn -out and in energy generation. They have been built in unit sizes up to 150 <br />TPD. Multiple units are used to increase plant size to 300 - 400 TPD, such as in <br />Agawam, MA. <br />1.1.3 Refuse - derived Fuel /Dedicated Boiler <br />RDF, in its simplest form, is shredded MSW with ferrous metals removed. Additional <br />processing, such as screening, can be applied to the incoming waste stream to <br />remove and recover glass, aluminum, and other non - combustible materials. <br />Additional processing stages may also be placed in the processing line, such as <br />5 Source: Consutech Systems, Richmond, VA. <br />GBB/C08027 -01 B -6 August 15, 2008 <br />