SWAG agenda 042215 - Laserfiche WebLink

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F M, Adak IMComprehensive Review of NW Solid Waste Collection and pis.posal Options • Compatible with municipal recycling activities Potential for less environmental impact 12.3 CONVENTIONAL WTE TECHNOLOGY 12.3.1 Basic Combustion System The combustion of solid waste is accomplished in a furnace equipped with grates. A solid waste combustion system with energy recovery includes: • Some type of structure to house the furnace and its appurtenances; • A "tipping floor" where the solid waste from collection and transfer vehicles is deposited; • A storage pit or floor to store the solid waste delivered (solid waste combustion is a 7 days per week, 24 hours per day operation; storage space is provided to enable this continuous operation); • A charging system (normally overhead cranes) which mixes the various solid wastes received to develop a somewhat uniform material and then lifts it from the storage pit or floor and feeds (charges)the furnace; • One or more furnace subsystems (sometimes referred to as combustion trains), which receive and burn the solid waste; • A grate unit to move the solid waste through the furnaces; the most common grate designs are: - Reciprocating Grate. This grate design resembles stairs with moving grate sections which push the solid waste through the furnace. Rocking Grate. This grate design has pivoted or rocking grate sections which produce an upward and /or forward motion to move the solid waste through the furnace. - Roller Grate. This grate design has a series'of rotating steep drums or rollers which agitate and move the solid waste through the furnace. • Air pollution control subsystems to clean up the combustion gases; and, • An ash handling subsystem to manage the fly ash and bottom ash produced from the combustion of solid waste. v2.1 156 10/22/12