Document 5kQRDbo1G9J5E9mv4avJwQVre

as if1 :;si V.fef .-to:- s- .1, frVI- |V: if. $*.' t.jjr1 ' n- S* '< V *yf 'V V:i, ^Vocesj ff h*aNnfrta Cendtntah ntwn} from procut LATEST AOOC0 STEAMING CAPACfTT for buddings and grow. ing load Is o 50.000-lb-per.hr puIvcrlzed-coaMIrod boiler City waftr FLEXIBLE SUPPLY for tfeom to both pJont process end rwg generation employs reducing volve ond desuperheating trqttrfl ftlADTAM A A large Worcester, Mass, manufacturing concern expanJijiq HUIl I Ule vU power plant to keep ahead of growing process and power neSr Plant expansion, including sw buildings and a greater demand for electric energy and process steam, made the recent addition to the C Street .power house, of the Norton Co, Wor a SO.OO0-lb-per-hr pulverited-coal-fired unit operating In parallel with the still (airty new 1939 units. The additional steam generator is designed for 690-psi drum pressure and 650 throttle. The unit has-a furnace station a flexibility that permits ij3j plying full plant process needs oo'-oKj ter how electric-power demand nriam Below the 650-psi level and team from three sources is a r*-* steam irom uiree soujcc* * *T..vi|t steam header. These thjee woitaa.titjS cester, Mass., an important element in volume of 3700 cu ft, a total healing (1)- two existing stoker-hrod bojlasfl meeting and planning for futute growth. surface of 15,070 eo h, a heat release (2) 120-psl bleed point from tha 2S0C By 1939, considerable progress had of 18,800 Btu per cu ft ond a tubular kw turbine-generator (3) outputtfaSJ been made in preparing for expected air heater of 5900 cu ft The entire the two 3*fn. *leam-pre**urred&iM| load growth as far as it could be de termined by conditions at that time. Two 50,000-lb-per-hr puWerized-cool- setting is steelclad. The two older 1939 pulverised-coal boilers are equipped with economitera but this most recent valves and desuperheater From this 120-psi header plant process steam aa well **.*^5* bred high-pressure steam generators, unit is not. The three steam' generators for a 500-kw 3600-rp/n slstiotH^SS designed for 690-pai drum pressure and 650-psi turbine throttle pressure, were 7(o5n0e-Fnsetwe,amtwotoolademr)aianllhseuapdpelry f6o5r0d-pies-i turBbeinleo-wgethnieeraptroers.sure level ru0*l^QB ready to come on the line, replacing two of four older low-pressure (125-psi) stoker-fired units. The remaining two low-pressure units served as standby in summer, but were on the line all the tribulion within the power plow itself, 0/1 th/s header, see flow diagram above, comes a 60,000-lb-per-hr 3600- rpm turbine-driven boiler-feed pump, o 2500-kw extraction turbine and two steam main. It receive* the the high-pressure Iurbina-driven feed pump, the exhaust of the main turbine-generator, and also haust from the 500-kw stsikitv,3??B time through the winter. Steam for lo comotives used on live plant grounds came off tho high-pressure units. These locomotives use steam at 440 psi. Despile'this enlargement of steam-generat ing facilities, plant growth since (939 - has made additional steam- and electric- pressure-reducing valves, 650-120 psi. turbine-generator. Steam at Ideal heal balance would call for full aure level goes to some limited use of extraction turbines and boiler- points and to raise the teraper^/Jtw feed pump. But in industrial steam the 120,000 lb-per-hr deaexstof, plants heavy demands for process and majority enters the heating psoowweerr rraarreellyy ooccccuurr ttooggeetthheerr.. BBeeccaauussee CCeonnddaannssaattaa dBaottuumm.. AAlthougcohBfti<flfdll generating capacity a necessity. t,his 1is so, the pressure-reducing stations buildings spread out ove-r -* . New Equipment. Latest addition is hbaadd !to be included. They give to the able area and about 209k 0 ,'4l 106 (618) POWER food in process become*.contaminated, body in the drum. Such a method, the ftjose o( eondensoie is returned. designer feels, effects rapid separation 3jdskeup, roughly about 20%, consists M steam from water. Also, the separa f^of city water admitted at the deaerator- tion is free and without disturbance. to meet water needs, For loodiag. Before the 1939 plant fti.four boiler-feed pumps--two 120,- change, a aingle slack employing only jOOO-lb-per-hr, 3600 rpm motor-driven, natural draft proved ample for opera jg'siad two 60,000-lb-per-hr, 3600 rpm, one tion of the underfeed stoker-fired boil- motor and one turbine-driven--are era. When the 1939 plant expansion ^booked up to pull woter from the de- went into effect a single stack design yaerator and introduce it to the boiler was followed for handling all flue gas ^against boiler pressure. A diOerenUaJ- from the pulverlzed-coal and stokerIpump control regulates pump output in fired boilers. But it was necessary to ^'esajuaction with the boiler water-level add a separate induced-draft fan to T control servo the stoker units in addition to the R`. Conyovar Control Generating steam fans called for in the design of the then 1st the 690-psi pressure level nnd oper- ' new putverned-coal-fircd boilers. A /ititg with a 20% city-water makeup mechanical dust collector was also jlfmakei a good water-treatment system a placed In the flue-gas circuit, which ^necessity. The problems-of silica and added further to fan loading. ^`carryover are particularly important. A Tho 50,000-lb-per-hr boiler addition Aiucceitfu) system for control of theae uses the already existing steel stack. Efictori comes from a series of daily This stack, together with induced- and Br'check* for various chemical concentre- forced-draft fans, is set up just outside. KViiom in the boiler water followed up the power plant building. The fans gb'y an over-all superviaion and advice have a special outdoor housing for pro K*by so outside water consultant A spec- tection against the weather. ipified amount of various chemicals as As in the older units, a mechanical Undetermined by these cheeks is added. dust collector has been connected into I:.-Control of carryover alao receives the new boiler exit flue-gas path. HiU /help from the design of the bailee dr? ^misting system. The eteom-water mix B''(aming Irom the steaming tubes enters unit consists of a aeries of 6-in.-dla tubular cyclone dust collectors. These individual tubular collectors have a Rtbe steam-release drum above the water ^')ml. Releasing all generated steam In Uie open drum space of the main boiler aingle inlet, comparatively narrow, with inlet height approximately ten times .width of opening. Tube inlet and diam ijvFUft 'be water level prevents E^fgeyitring and turbulence of the water ?Jy eter are proportioned so as not to effect any change in gas velocity. Snch a velocity change between tube entrance and the precipitating portion of tbe tube could quite readily set up an erosive action. The particular lube in service at this plant hot a lower capacity than the standard design but a higher degree of collection. The lubes operate on a Bat collection efficiency curve with almost 100% collection o! dust particles larger than 20 microns (approximately 675 mesh). Draft loss ranges between H in. and 4 in. wg. Coal. System. The new boiler fires in pulverised form e bituminous cool, ranging from 13,600 to 13,900 Btu per lb ond having on ash-fusion temperature of 2750-2950 F. Combustion control op erates from a compressed-air actuated system that regulates the coal to air ratio and rate of fuel feed (or various steam loads. Freight cars haul the coal in and it it unloaded to a plant coal-storago pile. From storage it is admitted to the coal handling system for delivery to unit pulverizers for grinding. Incoming cos) to the pulverizer moves on a belt over a magnetic drum where all tramp metal is separated. From here coal (alia to the pulverizer where U undergoes a combined impact and attri tion form of pulverization. A pulverizer fan mounts on the pul verizer shaft and from the fan cham ber blows the eoal and air mixture through pipes directly to the burners where it enters the furnace. PRINCIPAL EQUIPMENT OF C STREET POWER PLANT Norton Company, Worcester, Mass. GKKtRATOKS AMD AUXILIARIES: KlS"' * ' r. m ..I, 1IDF... **.' M,00 lb p,r hr- 721 PL T*0 P-.-Tph'bWol^t.**.**' * p" "nhJ-|JP#u^twr(lt|u...t....c..o..a...l...................... >vUr. S0.MO.lb anti.................. I RUi* Static Carp 'Pln7'"A SO.OOtMb wniii. 10S0 iq ft... 1 ` P unit....................... =SV-* 11 ,Ub**' .M0*lb unit... * ' ` *u'P,Bdd 'vm........................ j louty one foificUM*........ Dlimond Powir 8pic Cflfp rvltftt* yii,^"1......................................... .. Oiayi Column Co Pi*****- ..........,*................................ Miaolns. MiawiU k # iT.i vai*n... ................................................ .;Hf Corp ..Yarnill-Warlnf Co K *ai tali...!!'* ....................8tron|. Cartlala A Hammond Co '"chicileaf................................... Prat-Dinlol Corp KJ. ihnr, | M, unit.. Ibs-.sstssa'tKa-' BP .8.t.t.i.r.1..r.*.a..n..t..C. o ___ WoatlathouM Klee Corp .. .Waillf*|houto Bloc Corp Htlr.^Prr fcJ-Afaa .............................................................. P Sturiovant Co to old ttohor unlta [ 'V*-tu Wotirt11""' hP* Z*prr6....................MH-Chilratra Mt| Co ri hP- Z-apoad...................... AlliB.CIulmara Mf| Co ^"U< ,,B` . .Unllrd C o.Hav.i.a|.aj.ro.nr Corp Corp f?*^*1* 0*N*RATORS AND A UXIUARIES: St.ViVi'oI' iTl*' *'** S800 rpm............ Oaottal Blactrtc Co aw],,*?!: ?*' m kw. 3000 rpm.......... Allla-Chalmara M(| Co - `Mpoard.............................................Ornaral Klatirle Co %|R <*obof tqqg WATKK-r/tKATUtNT SYSTBU AMD AUXILIARIES: Dnirilor, oni, izo.000 lb prr hr... Worthln|i#ii '0amp S Uicbr Carp Cbimlcit pump, 1, automatic Autb vitoa, WorthlaatM Pump A Mochp Cotp Candmuti ratam pumpi. A..............................................tnamoU-HmC Co lit fpra, 1480 rpm, StLS-fi hnd PRESSURS REDUCERS, CONTROLS. INSTRUMENTS: Praaanra r4ncara, S, S-to. valvaa.......... ..Mai Nrllan Btfulnor Ca Daiuparhapitnt aiatlana, I..................... ..............................Blliolt Co Ortupr/hiaiar coatrot ....................... .Miioa-Nallaa Rosulilor Ca PVUPS A*D COUPPSSSOKS Bolltr faad. two, 100D>pai oultat.................... . .Inforaall.Rpnd Co 1400 rpm, 1ZO.OOO 1b pti hr, motor drtvan Boilrr /rod, two, !OO0>pti ooilrt...................................... fntaraofl.Rand Co JMO rpm. OOAOO lb prr hr. I motor, and I lurbina-driwan Boilar-taad moton, two, f00 hp. 1000 rpm........Waatlnthouaa Blac Corp Boilar-tpad mator, oar, IIS hp. 1000 rpm........Wtttlft|bout Bite Corp Batlir-fred toibfnr, oar, IZS Hp.......................... ferry Slttm Turbina Co Praaaura raiulatora, I..................................... Nonhorn Equipment Ca OlSatanital prtitura pump conuol Campreiaer*. t......................................................... Waailnshoua* Kite Cotp 100 pat. atindby lor combination comiola Comboatioo conirola, watrr and aioam Now. Racordara, bollrt temp, aiaam and waiar.... jhBallay Motat Co Ca|*, draft........ J Ballay Mttrt Co. | Hoyaa Corp Co Oaaaa, prraioto.. ( Aabcroft \Manninf, Maawill A Mooto. tnc CONSULTING ENGINEER.. ..............................Sill A WarHas'on |6I9) 107