OCR Text |
Show - 2 - produces .tea. using flue ga. heat recovery boiler.. The incinerator pl.nt i. owned by the Quebec Urban COlllD1ni ty (Que) and i. loea ted in an indu.trial area of Quebec City, adj.cent to residential and commercial zone.. It receives municipal and commercial .olid va.te collected by the oue, a. well aa fro •• everal other ~cipalitie. and private contr.ctor •• All of the .tea. generated by the plant' • . :" four incinerator un1 ta i. .old to a local paper cOlllp&ny. 'lbe incinerator pl.nt employ. the technolocn developed in Europe .nd repre.ented a contellpOrary de.ign when built in 1974. Throughout the ye.re, • number of de.ign change. were _de to illiprove the oper.tional proble_ in the pl.nt, .uch as furnace .l.gging and elli.aions of l.rge unburned materi.l. Bovev~r, aome of the de.ign changea compounded exiating ellie8ion problems. PLANT OPERATION The principle ele_nt. of the Quebec Urban C .... 'ni ty am1cipal vaste incineration plant are .hown in Figure. 1 and 2, and include • refae .torage pit and crane .y.te., four inciner.tora/boller., each rated at 227 tonne. per day, electrostatic precipitator., ash quenching 8y.teu vith storage pit and cr.ne, and a common .tack. Each inciner.tor conai.ta of • vibrating feeder-hopper, feed chute, dryug!burning!burn-out grates, refr.ctory-lin.ed lower burning zone, v.tenralled partially-lined upper burning zone chamber, • vertical tube _chan1cally-rapped va~te he.t recovery boiler vith .uperh.ater .nd economizer, a two-.tage electroetatic precipitator, an induced· dr.ft fan, and • vet aah quench/re.,.al sy.te •• DESIGN MODERNIZATIOR In May 1985, • cOliprehenai ve .tudy va. cOllpleted under HITBP Oft the .:>4ernization of the Quebec incinerators. Th. .tudy detalled the _ny ch.nges that vould be required to tr.nafora the incinerator. into • -.tate-of-the-art- _. burning de.ign and to reduce the ex1.tinCJ emi.sion proble-. Based on the .tudy findinCJ., the CO2 decided to experi.ant by upgr.ding ane of the incinerator unite to a ..... the iapact of the prqpoaed change. before aodificationa were _de to all the 1Ulits. TO en.ure th.t the .o.t .ppropriate furn.ce configuration v.. developed, • . one-aixth .c.le, three-di_naional flow IIIOdel of the furn.ce V.8 fabric.ted of vood and plexigl.... Through the plexigl ••• panel., tr.ined obeervers vere able to vi.ually •••••• the .u.x1ng pattern of the various furnace configurations being inve.tigat.d. S.vdust and air were used to simul.te • number of combustion conditions. In addition, video t.pe. vere _de of the model .tudies to .llow for a .ore detailed a •• e •• .ent .t • l.ter date. In .11, 52 different condition. vere run which looked at, . |