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Reîssued‘Oct. 13, 1942 - IRe.A2,201 UNITED STATES PATENT ‘OFFICE , 22,201 GAS TURBINE PLANT `Alf Lysholm, Stockholm, Sweden, assigner, byu mesne assignments, to Jarvis C. Marble, New York, N. Y., Leslie M. Merrill, Westfield, N. J., and Percy H. Batten, Bacine,-Wis., as trustees original No. 2,238,905, dated April zz. 1941, serial'> No.207,457,May 12,1938. Applicationforre issue April 21, 1942, Serial- No. 439,956. In GreatBritainMay 14,1937 21Claims. (Cl.60-41) The presentinvention relates to gas turbine plants of the continuous combustion type com prising a plurality of turbines or turbine stages and a 'plurality of heating means for heating the motivefluidtobeexpandedintheturbines. In order to obtain a.simple control of such gas tur bine plants, it has proved suitable, in designing the gas turbine system, to make endeavours to have the different parts of the plant at variations in loadadjust themselves automatically so that under normal conditions the change of the fuel supply to a single heating chamber or the like willbesufficienttoadjusttheusefulpower'as._ theprovisionofheatsupplyingdeviceshaving well as the power required for the compression ofthecombustionairinvaccordancewithvaryî-_ possibleaccuratelytoadjustthesupplyofheat ing operating conditions. , I However, such simple control is not always to theseveral heating devices vand to`-have the several heat supplying devices respond in dif ferentwaystotheactionofthecontrollingmem possible. Itisoneoftheobjectsoftheinven tiontoprovideinplantsinwhichasinglecon ber. . trol would n'ot be sufficient, simple controlling 20 means to be easily adapted to varying load con _ditions. Another object of the invention is to provide means whereby it will be possible to sup It is, for instance, `‘possible to actuate such heat supplying devices, such as fuel p_umps, _by a com mon centrifugal governor, each individual pump responding, however, in different manner to the common controlling impulse. There is a fur ply heat to the variouslheating means independ ently of one another. A further object of the 25 ther possibility of adjusting the characteristic invention is to avoid as far as possible the use of control valves for the supply of motive fluid to of each heat supplying device in a manner such- that all heat supplying devices or part of them will respond to the action of the control member throughout the whole range of load‘or only part .theturbines. Duetothelargevolumesofthe motive fluid and the high temperatures of the same such control valves are very expensive and ï thereof. The heat supplying devices may be in cause considerable losses of pressure. For a betteryunderstanding of the nature of the present'invention and the advantages to be de# riv‘ed from its use, reference is had to the accom panying drawings forming a parte! this specifi-` ~' Vare used for supplying metered quantities of fuel cation. ~ _ In the drawingsf Fig.V 1 shows more or less diagrammatically a gas turbine plant for driving an electrical gen erator, some of the parts of the plant being shown in section; l l - Fig. 2 is a.gas turbine plant adapted for marine propulsion and comprising four-gas turbines coupled in series, each of the turbines being pro "vided with heating means for the motive fluid; Fig. 3 is a diagram illustrating the operation 'ofthefuelpumpsofthegasturbineplantshown in Fig. 2; and Fig. 4 shows a gas turbine plant in which gas to separate combustion chambers in which the fuel is burnt with air compressed >in a compressor driven by part of the gas turbines. l desig nates a high pressure gas turbine mounted on ashaft l2 which by means of a coupling Il is connected with the shaft I6 of a'low pressure turbine I8. Another low pressure turbine 2li coupledinparallelwiththeturbineIBismounted on a shaft 22 which also carries an electrical ‘ _generator 24, pump'actuating cams 26 andv 28, and a. toothed gear 30 for driving a speed gov ernor32. Coupledtotheshaftofthelowpres sure turbine I8` 1s an air compressor consisting ofa low pressure compressorv 34 and a high pres ls produced»in gas generators associated with r surecompressor 36. The compressors are of the _ the turbine plant. In gas turbine plants in which the motive fluid rotary screw type having a casing and rotors 38, 40 and I2, 44 respectively provided with inter meshlng lobes cooperating within the casing to is heated by injection of fuel each individual combustion chamber may be provided -.with a separatefuelpumpthefuelsupplyingcharacAt' TheOutlet0fthelowpressurecompressoris LI teristic of which is independent of that of the other. fuel pumps or is individually adjustable. Assuming a plurality of such fuel pumps running at the same speed because of a common drive, said fuel pumps may, in accordance with’the` present invention, be varied separately and in dependently as to their fuel supplying charac teristics, that is, any influence due to controlling movements should act on each pump in a difier ent way so that thevsupply of fuel by one pump may be changed in a manner different from the changeofthefuelsupplyofotherpumps. By individual heat supplying] characteristics it is the form of fuel pumps, gas generators, heat exchangers and the like apparatus for imparting heat to the motive fluid. . In the embodiment shown inFig. l,fuelpumps provide compression -spaces of variable volume.PDF Image | Lsholm Turbine Plant 1942
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