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Figure B-3. Typical Modular Combustion Sysneml <br />Less than the ideal �otoichkon�otrc1 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 vvestm 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 channber. With less air, the fans can bosrna||ar 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 fora <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 vvabenwa|| unite in waste <br />burn'outand 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 Fuel/Dedicated Boiler <br />RDF,inits simplest form, is shredded mBNwith ferrous metals removed. Additional <br />processing, such as screening, can be applied to the incoming waste stream to nanuve and recover glass, aluminum, <br />and other non-combustible materials. <br />Additional processing stages <br />may also be placed in the processing line, such as <br />sSource: Consutech Systems, Richmond, VA. <br />GBE/C08027-01 B-6 August 15,2OOQ <br />