USE OF SECONDARY-FIBER REJECTS AS FUEL FOR A COAL-FIRED STOKER BOILER

Secondary-fiber rejects are inevitably produced when recycling wastepa per into corrugating medium or linerboard. The rejected plastic strand s and difficult-to-recycle fibers are usually landfilled. This study i nvestigated the feasibility of chopping these rejects into 2-3 in. fla kes and then burning them in a spreader-stoker boiler. Two test burns were conducted using a mixture of 10% rejects and 90% coal. In one of the tests, about 5% lime-kiln dust was added to the rejects to help so rb any potential increased chlorine emissions from the plastics. Analy sis of stack gases and ash indicated that burning an admixture of reje cts and coal would produce no major environmental or operating problem s.