Process and system for producing engineered fuel
A process and system for producing an engineered fuel product that meets customer specifications for composition and combustion characteristics is provided. The engineered fuel product is preferably a high-BTU, alternative fuel that burns cleaner than coal or petroleum coke (petcoke) and has significantly reduced NOx, SO 2 and GHG emissions.
1. A process for treating a solid waste material, the process comprising:
removing a first set of waste components from the solid waste material, the first set of waste components comprising ferrous and non-ferrous metals;
shredding the solid waste material after the first set of waste components are removed from the solid waste material;
removing a second set of waste components from the solid waste material, the second set of waste components comprising one or more of organics, glass, aggregates, wood, electrical components, batteries, textiles, rubber and yard waste;
proportionally adding a clean stream to the solid waste material, the clean stream comprising fibers and clean plastics, such that a desired plastics content is introduced into the solid waste material;
removing a third set of waste components from the solid waste material, the third set of waste components comprising ferrous and non-ferrous metals;
reshredding the solid waste material;
densifying the solid waste material;
passing the solid waste through a screener to reject materials of 2-inch particle size or less after shredding the solid waste material to a particle size of 10-inch or less; and
prior to proportionally adding the clean stream to the solid waste material:
introducing the solid waste material into a separator, the solid waste material comprising heavier weight components, medium weight components and lighter weight components, wherein the combined medium weight components and lighter weight components have a combined density of 8 pounds/cubic foot or less,
separating the heavier weight components from the medium weight components and the lighter weight components in the separator,
positioning a receiver at either a first receiving location or a second receiving location with respect to the separator, wherein the receiver is capable of receiving the medium weight components and the light weight components, and wherein the first receiving location receives more of the medium weight components than the second receiving location, and
capturing an amount of the medium weight components and an amount of the lighter weight components in the receiver,
wherein the solid waste material is shred to a particle size of 10-inch or less before removing the second set of waste components and is reshred to a particle size of 2-inch or less after removing the third set of waste components, and wherein the ferrous and non-ferrous metals of the first set of waste components have dimensions of 12-inch by 8-inch by ½-inch thickness or greater, and wherein the ferrous and non-ferrous metals in the third set of waste components have a size of ten square inches or smaller.