Document 3QYXkyg7dRgvyGQwprN2nNn6a

cipitator before entering the (q'^9 draft fan suction. From the air inlet to the i-d fan Inlet the path is divided into four paralleling^! with dampers at the air-heater iofijBj and near the car dumper. This &wiil be in line with the policy of elimi nating *11 dost nuisance. These colaTeciors discharge to a' central dust ^collector above the bunkers. From this vacuum system the collected eoal dust exhausts to the bunker. The principal power-plant equipment of Station C is given below. Acknowledgments. Power is indebted to the firaddock IJght and Power Co for their cooperation, and to H S Fred erick of the Stone & Webster Engineer ing Corp for the basic data that la con tained in this article. This permits shutting down lane to clean the precipitator wife) discharging any flyash to the The unit remains In service durlpJralUl operation with the other three., carrying the gaa Bow. ^ jtfjj The dry-bottom boilers will hsvsVri fractory-lised ash hoppers belovfvtL furnaces. Vacuum dry-type eemUntS matio ash-handling equipment include? ash-storage silos, ash moistenertffdiS chargers, motor-driven exhuiiuJS transport piping, valves and io'foH)9 There are 33 points of autcntsUe^Sig trol on the ash system, the boiler? hopper being the only point lefftTt manual control. ' Coal Handling. Coal will be deilraw] on railroad sidings, which will be&Uefl with a track scale having an autonuSuH weigh beam. Trackage will *c5$gWl 850 p$*. 983 f modate about 100 coal cars. A ioUrja type car dumper will discharge car'eng] tents into a 2-outlet hopper. IndinSi feeders-and two inclined-belt conVera?--. deliver coal from the hopper IntftftjS entrance chute of the Bradford brkpTM For the initial installation, twr claiming hoppers will be adjattrt the car dumper, each with a feeder^ livering to its respective conveyor.^ ing to the Bradford breaker. Te& design under the car-dumper claiming hoppers contemplstes;ihg ture installation of a convayoigfl stocking-out boom at the louth'cwTii \--!j*2P-l Cvcocro4MtoVr AcolnllWdejnnsHsr/.. '0AA */, HEAT-BALANCE LAYOUT FEATURES deooroting heeler opereting at over 150 ptio el full cepebllily of mein unit. Evoporotor hot teperote evoporotor. condenser the coal-atoroge area. -'ig Bulldorers will.be used for'pj&jffl coal in the storage area and reclsffli,"' at a later time. ..i$] The Bradford breaker dischsrie^^ per will have a short horitonul^ conveyor delivering coal into a diitfj hausters. Four motor-driven oil pumps serve to ignite the coal in the furnace. Automatic combustion control will supervise end adjust steam and furnace draft pressure, fuel-air, steamflow fuel* flow, end primary-oir* fuel-flow ratios for each of the boilers. Automatic su perheat temperature control equipment will also bo provided. The (wo tubular air heaters arranged in parallel on each boiler will be fitted with dampers so one can be shut down at low loads. The increased velocity will result in better heat transfer. Two forced-draft and two induceddraft fans, each with individual singlespeed motor drive, will serve each steam generator. Forced-draft fans will be direct connected with flow control by inlet vanes. Induced-draft fans will be driven through magnetic couplings. Each boiler has its own radial brick chimney. Each stack exit will be equipped with a venturi throat or noxxle to give (he flue gas a leaving velocity slightly under 7000 fpm at full load. Ash Control. Because of the nearness of residential areas to the plant site special precautions have been taken to reduce flyash leaving the stock to a negligible value. After leaving the air heaters the flue gas enters a mechani cal flyash separator from which it flows into a 3-secdon electrostatic pre ing hopper equipped with e cost pier. From here coal feeds' chutes. Oho leads to a belt iaS running to the initial stockings'll1 other two chutes discharge to inclined belt conveyors leading^ station. Only one station conve'ma be installed initially. *!i3m The Inclined conveyor to delivers onto a horiiontel veyor extending over the bunkeri-Jjjg coal bunkers with about 120Q$ pacily will be installed in tbe;m equipped with one auiomstlp Kale to check pulveriser pcrfofFj Dust-collecting equipment "rasL, stalled at all points of coal WS)*the station, the Bradford krea*5lj 71 ($90) POWER OeloWft PRINCIPAL POWER-PLANT EQUIPMENT Station Cr Units No. 1 and 2, Alexandria, Va. Broddock Light and. Power Cor Inc ISftEAM-OENERATINO EQUIPMENT, ftjv W'ailUr*. ............................................................Combustion Engineering Co gk-ggO.QOO lb por hr continuous, ITS pslg, (II P, IS,620 iq (t Ifi^perhtatara, 7................................................ Combustion Engineering Co jV|.itiitt. lew-temp 11,700 tq It; Int-temp 17,700 eg It; hlgh-ump *s It i bpp*i control end tilting burner* fc'BceaaaJtere, t ............................................. Combustion Engineering Co it;*-Continued* flnnad tube, 17,170 aq It ii-'SIr prehiitcra, 7................................................Combustion Bnglnsering Co 3S/,Tbultr. 4-pau- 177.700 >1 It t>)Bcmra, IS per boiler....................................Combustion Engineering Co &".TUiini, pulverised cost, four In etch cornet * Pulveriser*, 4 per boiler..................................Combustion Engineering Co Ripmsnd bowl, 21,406 tb per hr, 100 grlndabillty on Herdgrov* eetle BElonl blowers............ ................................Diamond Power Specialty Corp jEWBoner end euperhtr, II: eeanemlenr, S; sir prtheeter. S K(P*rc*d-dralt lent, I per boiler............................. American Blower Corp ELrtitO.OOl tins, 100 P, It-ln, tote] bead, 1700 rpm, lalsl-vin* coatrol RyMeuver-tpp* damper to fan outlet . lMladtccd-drfi leas, 7 per boiler..............................American Blower Carp Lr|/|l#,000 dm. IIS 7, li-ln. eoetlon, 770 rpn> Wl-d Iib magnetic coupling..............................Blectrlc Machinery Mtg Co EsIPerred-drilt (an drive.....................Allls-Chatmers Manufacturing Co fitf.IM bp, 1170 rpm, 7700 v, 1-phtss, SO cpclt |Fteduced-drlt (to drive................... Allis-Cbslmers Manufacturing Co BM709 bp, SOD rpm, 7M0 *, SO cycle, J-pfaaaa vCemhnttlou-cMtrol tpstem.............. ..........................................Hagen Corp Klnieiiir Row and level control....................................... Ballop Meter Co gluperhttt control......................X............................... Loode A Northrop Co t*8*....................................... Mfeeourl Boiler A Sheet Iran Work# RWater-treeMnt equipment............................................................... Infilco Inc rialetp valves................. Consolidated Dlv, Mtnnlag,.Maiw*ll A Moore rijrsed and chick oelvoe.................................................. Bdwerd Velvet, loe HWewoff valves .................................................................Yereall-Werlng Co e*(i*r,8v,8<nne and |iga*......................... Diamond Tower Specialty Cerp *#,WI* Tllr>>.......... Koneocb Dl. Manning, Maxwell ft Moore jyi EQUIPMENT, 1.....................................................Oenertl Bteeirle Co *-1-.}'*' ,M p*1*- "* 1 -' Hg eba, 7 blted points. 1100 ?Ivj M * l-Pbso*, 60 cycle, 0.IS pi. direct-connected male -Wtad pilot atelier Bp- 'Tlom*11- *............................. Worthington Pump sod Machinery Corp cio7.i^ ita ,'P,M- Inner air coolers end hetwell RL footing pumps.................... Worthington Pump and Machinery Corp Mndoaeer. verilcal. 7S.4M gpm, 4l.ft total bead \ * PmS drlvas.......... ............ AHIi-Chelmira Manufacturing Co *i2r*bP' 1,0 rpra' 1,00 * dft-trele W ,if*0UB5 P'lmV * P*v enndanadl........ Kinney Manufacturing Co i*. 1 ** ',,B- H| aba, epproe If lb per br water vapor and 16 LI*r hr alt at 70 9 I ^T*......................................................... ... Blectrlc Ce Evaporator, I per unit.............. Horlfonloli SJO aq It .. Weetlnghoufo Blectrlc Corp Evaporator deaerating prtheater....Worthington Pump and Mach Corp. Bvaperater eondaneera............................... Wsstlngheuee Blectrlc Corp Horlsontal, ISM aq ft >7th-atefe oondcaaratlng htater. .Werthlngton Pump end Mach Corp 710,006 lb par hr, trey type^ IS-pala ateem press, vent coadoneer SUt-etat* deaerating better............ Worthington Pump and Mach. Corp ' 110,000 lb per hr, trap type, 177-pale attam praat, 7 vent can- denaere, lS.777.gat storage tank Bollar-feed pumps, I par nnlt... .Werthlogten Pump and Mack Corp 1077 gpm, 747j.lt total head, 1770 rpm, constant speed Boiler-teed pump drives............................... ............Oenertl Bleetrle Co 000 hp, 3400 rpm, 7709 v, SO-cpcU, squirrel cage Betradlon nenretom valves................................Atwood ft Merrill Ce COAL-AttD-AM.HANDUMa EQUIPMENT, R R track ecale, I................... ................ The Howe Bcele Co Rotarp railroad car dumper.... .............................. Link-Belt Co Coal bunktr duplet gates.... ...Btepbcna-Ademaon Manufacturing Co Bradford breaker.................. ................ Penneplvenla Crasher Co Automatic eoal ecale.............. .............................Stock Engineering Ce f Lansing Cerp Vacuum-cleaning equipment .. .............. V Blllmpre Dlv, Lamten Cerp Oneteve Preeten, Agents - Dust-*!l*<tieg equipment..............1................................. Panghere Carp, Hand-operated windswept dual velvea...... The AUen-Sherman-Hoff Co Aah-handUng equipment........... ..................The Allen-Bhermen-Heff Ce Coal spraying equipment.......... .............................. /oknaen-Merch Cerp Belt-cenvtpoc tripper................ ..................Robins Conveyor* Division Coal-bandllng equipment......... . .Stephena-Adameon Manufacturing Co MISCELLANEOUS BOtf/PIfEWr.- Oag* board* ........................................................................Hagan Corp Station piping............................ ...........................Benjamin P Bhaw Co Circolatlng-watar piping....................Naw York Central Iron Work* Motor-oporotad main stasm valves. Chapman Valva ft Manufacturing Ce ISOO-lb weld valvas....................................Heonleg, Maxwell ft Mooct Olobe valves ....................... ....................Hanning, Maswell ft Moor* BlactrU travallog erana......................................................Whiting Corp Automatic air filter*...................................... American Air Filter Corp Vcatllajlen lane.......................................... Weetingbouse Blectrlc Corp Freight aod passenger elevatori................................. Otli Elevator Ce Bowago ojacter pumps............................ Chicago Pump A Machine Co Tank* ........................................ J B Hurley Machine end Boiler Worha Boiler-room air-supply fans. ..Btnncvant Dlv, Wcatlnghooie Blee Corp Hydrostatic teat pump................Worthington Pump end Machinery Co Miscellaneous pumps... ..Yeomens Brother* Air eempraeiore.............................. ....................... Ingeraolt-Rend Co Floor grating................................... ....... Headrick Manufacturing C* Btmturel steel spd bankera...... ............. Bethlehem 8t*e) Co Qtlvenlaed eobatetlen steel.......... ................... American Bridge Co Channel-type roof slab................... ..................... Lattak Products Ce Stair treads and platform plates.. ..American Abraelve Metal* Co Mlicsltanoeu* Iron-........................ ........ Bmplr* City Iron Works Rilling* .......................................... ...............A P fere* Iron Work* Corrugated asbestos........................ .......................... The Bnbereld Co Steel aaah ...................................... .........The William Bayloy Ce velvea.................................. vlnettag equipment.......... . ELECTRICAL EQUIPMENT: Allle-Chetmer* Mfg Co y5_MdTAR SYSTEM: Btarlon-iervfce rransfermm..................J Moloney Electric Co ^Weertnghout* Electric Cerp I0*8.............. Kttniejia*^41230 TSP..m.W. IoSrOth-ifnt gt.to.o.unWtePheoatmlntdpgheonndeeMaBclheicnterlrcy CCoarrpp Btatiea-eerviee circuit breeker*................................Oenera'l Blectrle'Co 7700-v etatlon-servlc* switchboard............ f-T-B Circuit Breaker Ce nS?s bn &*dautJ iL** *rl*os....6...0..-..e..j.c..l.e..,...a..q.Wu..le.r.r.ae.t.llnWcgaehgaoetul,ncgeTbOoOBulrsep*cmtBrlcleeCtrolerp Corp Bwitehbearde............................................. (Weatlaghoua# Blwtrie Corp \ Kalak Co RDvala t--.e*e**lr*S elVq ItI"P>.................*.7....0...0...Wg.ep..e.m..t.l..a..g1..7.b.1.o.0..B..rMIpnmgBerleseotllr.lRe .oCderCp e Coalyard unit substation................................... AlUa-Chalman Mt| Co ESSfTsw'3...T^Hlel.-al^. Z|B**Kf7tpW0re,0e<ad`qbhbf|cSJ"S"...*..1-.TM..>..*.p...h..a..e..e..p...O.....O......-..c...y.W.c..lee..,.e..t.Il.nt..Wg..h..o'.rnWpemeeetBlnlegebteroleaeCoBrlpeetrleECNoGrpINEERS AND CONSTRUCTORS Btoao ft Wobetar Engineering Corporation ` October 1940 .......... ($91) 79 Sir*e,- 77l