Agenda - Council - 04/25/1989 - Laserfiche WebLink

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pp 2 of 2 The Shaffer furnace was not in service during my visit. It was down for refractory repairs and replacement. The propane burner is rated at 3 MM BTU/hr. The average propane consumption is 30 gph which results in burner heat release of 2.75 MM BTU/hr. The recovered aluminum requires approximately 840,000 BTU/hr, the scrap iron al:proximaLely 110,000 BTU/hr and the heat loss was estimated st 100,000 BTU/hr resulting in a net difference of approximately 1.75 MM BTU/hr discharged from the furnace with the burner at maximum rate. PARTICULATE REMOVAL The existing water spray is an inefficient method of removing particulates from a flue gas stream. The existing stack from your reverberatory furnace was observed to be clear. However, since a charge of dirty scrap could result in stack emissions, our recommendation is to install a baghouse filter to remove the particulates that can be generated from your recovery process. A baghouse installation recuires an !n~luen~ gas stream +' -~ - . ~,e¥_,~ we~ing of the fi!net ~n~ is above she aew Do!lit to ~- '~-~ ba~s. We therefore recommend that the water sprays be removed =-~ ~ ~m the Shaffer Furnace and that the flue gases be ~~ by alr ~lu~_on to attain the proper baghouse inlet temoeratures of =~ . ~,om 250 to 300 F. During the summer,the cooling air required to lower the baghouse inle~ temperature to 300 ~ is~.=°'00 SCFM w,~h th~ = ..... ~ rated caDac_~%,q ~ - of ~ ~'~- The products ~ co~ustlcn from the propane are 510 e~ resu!~ing ~ a tot~l recuired cas flow of 8910 SCFM or n3 000 ~_M=~t 300 F A portion of nhe cool~n$ =~r enters the system via the hco~ above nh=,_ furnace. ~'~=.,.~ balance o=_ th=.._~-ir re~,:.ire~_ ~-~ ~ ' s~c~,~ ~_ blower ~ ..... ~ a ~amper field ............ ~ight ueta!. Therefore, ~he bachouse must ~= ~=~ed the fire codes.