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4 the combustion chamber issurrounded by a hol low space 296 which through openings 298 and 300 communicates with the combustion chamber. The correspondingpartsof‘thegasgeneratorfor the low pressure turbine comprise a combustion chamber302inwhichfuelisburnedona.Stoker 304. Fuelissupplied‘tothestokerbymeansof a supply conduit 306 provided with a rotatable constant speed. Without control of the compres v sor by means'of the valve 336 the air quantity suppliedtothegasgeneratorswouldbeconstant tive fluid to be cooled by air passing directly from the space 296 surrounding the combustion chamber. >T'heothersafetycontroldevicecon 222.611 " i . sluice Valve 308 operated by an electric motor 3|_0.Amotor312drivestheStoker>304.An, `pressureturbine`isusedasanimpulseforthe ash chute 814 is provided below the stoker and ' has a rotatable `sluice valve 3I6. The lower por control. yBy means ò'f conduits 364, 366 and 368, the thermostat 362 acts on suitable bellows di agrammatically indicated at 310, 312 and 314 in such a way that upon increase of the tempera» ture in the inlet conduit 343 thenspeed'of the motors 3l0’and 3|2 will be reduced, the valve 360 will be more or less closed, and the valvie. tion of the combustion chamber is surrounded by a hollow space 3|8 which, through openings 320 and 322, communicates with the combustion 15 chamber, 324indicatesanaircompressor,328 an electric/generator, 328 a starting motor, and 330 a gearing for driving a centrifugal governor ' 816 arranged in a by-pass conduit 318 will be ' 332. The compressor 324 is`provided with a bleederpipe334havingavalve336operableby20 the governor 332 by means of a suitable linkage 338 in ysubstantially the same ~manner as de scribed with reference to the valve 13,6 shown in Fig. l, with the exception that in the present embodimentthevalve336willbeopenedalready25 ' at a little> decrease of ’theload below full load. This is,necessary for`the following reasons.` In the present embodiment, the air compressor is directly connected to the electrical generator _326 opened correspondingly. i , Inthepresent'embodimentthereareprovided, in` addition to the normal control means, two safety controlling devices constructed in the form ofthermostats. Theoneofthesecontrollingde vices has for its purpose to prevent undue rise ofthetemperatureofthemotiveiluidintheinlet conduit 342 of the high pressure turbinel and is in the form ofa thermostat 380 wihch at a cer tain maximum temperature by'means of a bel _lows 382 opens a valve 384 disposed in a second vwhich is assur-nedAto be driven at substantially 3,0by-pass conduit`386 and thereby causes the mo "result that a portion of the compressed air can pa'ss‘from the hollow space ,296' directly to the highpressure turbine without taking part in the combustion. ' Control of the llowVpressure gasgeneratoris I effected in'substantially the same manner as the controlofthehighpressuregasgenerator. How ever, instead of the load governor a thermostat 362 provided in the inlet conduit 348 of the low at`alloads. Thiswouldresultinaconsiderable vsistsofathermostat388locatedintheexhaust decreaseoftemperatureofthemotivefluid'atlow 35pipe380'ofthelowpressureturbineandadapted- -loads so that the plant weuld operate at very poor partial load efliciencies. ' Air compressediin the compressor 324 passes throughtheconduit'340intothehollowspacel 296 surrounding the combustion chamber 280 40 and therefrom partly through the openings 300 ,to the zone of `combustion and partly through the openings 238 to the combustion chamber where it servies as. secondary' combustion air. The motive fluid produced in the gas generator is supplied through a conduit 342 provided with a control valve 344 to the high pressure'turbine 216 upon rise ofthe temperature in the exhaust pipe to a certain maximum value to open a valve 390 by means of a bellows 392._ The valve 330 is locatedinaby-pas'sconduit384throughwhich motiveiluidnotheated-in`thecombustioncham ber 302 can flow to the inlet of the low pressure turbine and thereby cool the heated motive iluid supplied through the conduit 348. Y f, ' From the foregoing description, it will be evi dent that many specific different arrangements may be employed within the scope of the inven tion, and it is to -be understood that the inven- ~ and thence through the conduit 346 to the gas I tion includes all that falls within the scope of ' generator ofthe low pressure turbine, in which the excess of air contained in the exhaust gases 50 is utilized for burning the fuel supplied to the low pressure gas generator., The motive 'fluid ' produced therein passes through `a conduit 348 provided with a valve 350 to the low pressure turbine 218. 55 Control of the high pressure gas `generator is’ effected in.`such a manner that the governor 332 in addition to the bleeder valve 336 controls the speed of the motor 288 actuating `the fuel supply valve 286 and the speed of the motor `28|)which drives the stoker 282, this regulation being ef fected .by varying resistances 352 and 354 by meansof a‘control member 358 diagrammati r-allyindicatedinthedrawings` Upondecreasein load the speeds of-the motors 288 and 230 are reduced so that the supply of fuel and the velocity. ofv-the stoker will be decreased. The governor -further actsrupon the valve 344 and upon a valve _ ` 358arrangedIinabv-passconduit360. Thelast named valves are mechanically interconnected to 70 each other in such manner that.yat full load the `valve 344 is entirely‘opened and thevalve 358 is closed. Upondecreaseinloadthevalve344re duces the cross-sectional area, whereas the valve 358 isopened to a corresponding degree with the 75.means for supplying fuel to the several heating v ‘the appended claims. WhatIclaimis: l ` 1. In a gas turbine plant of the continuous _ combustion type, a plurality of'turbines, com pressor means driven by at least- one of said turbines and arranged to produce a variable quantity of motive fluid, a plurality of inde pendent heating means arranged at least before part of saidturbines, means for supplying motive fluid.from said compressor means to said heat ing means and to said turbines, and a plurality of independent positively metering heat supply .means for supplying independent variable quan titlesoi'heattotheseveralheatingmeans.' 2. In a gas turbine plant of the continuous combustion type, a plurality of turbines, com pressor means driven by at least one of said turbines and arranged to produce a quantity of motive ñuid variable ink response to varia tions in the load on the plant, a plurality of independent heating means arranged at least be fore part of said turbines, means for supplying motive ñuid from said compressor means to said heating means and to said turbines, a plurality of indepedent positively metering heat supply`PDF Image | Lsholm Turbine Plant 1942
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