SINGLE WHEEL RADIAL FLOW GAS TURBINE

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SINGLE WHEEL RADIAL FLOW GAS TURBINE ( single-wheel-radial-flow-gas-turbine )

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US 7,062,900 B1 12 SINGLE WHEEL RADIAL FLOW GAS TURBINE CROSS-REFERENCE TO RELATED APPLICATION This application claims the bene?t of US. Provisional Patent Application No. 60/482,671 ?led on Jun. 26, 2003, Which is incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates generally to gas turbines, and more particularly to a single-Wheel radial ?oW gas turbine in Which the rotor has a centrifugal compressor and a radial outWard ?oW turbine on the same side of the Wheel and in Which the stator has a radial ?oW combustor and noZZle vanes positioned radially betWeen the compressor and the turbine. 2. Description of the Related Art Industrial gas turbines are commonly employed in appli cations Where high poWer to Weight ratio, loW emissions, andhighavailabilityrequirementsprohibittheuseofrecip rocating engines. For example, in the oil and gas industry, small industrial gas turbines are used for pipeline compres sion, oil pumping, Water injection, gas lift, and o?fshore platformpoWergeneration.Also,inthelargeelectricpoWer plant market, gas turbine combined cycle plants are pre ferred because of their loW air emissions and part load performance.Currently,approximately40,000industrialgas turbines are installed throughout the World. US. Pat. No. 3,015,211 to Luttrell, Which is incorporated herein by ref erence, is an example of a gas turbine device. 20 25 30 35 ForsmallerpoWerapplications(forinstance,lessthan about 500 kW), existing gas turbines often employ a cen trifugal compressor, a 1800 How turning combustor, and a radial in?oW turbine. Such gas turbines are often called radial?oW orcentrifugalturbines.Suchconventionalradial ?oW gas turbines are more compact than axial ?oW gas turbines,butbecauseoftheir1800How turningcombustors, they are very complex and expensive to manufacture and they are someWhat intolerant to rugged environmental oper atingconditions. For a number of industrial applications, customers desire simple, loW cost gas turbines that can function under very rugged environmental conditions, are easy to repair or replace,canbeoperatedbypersonnelWithminimaltraining, are portable, and can handle a Wide variety of fuel sources. Suchapplicationsincludeupstreamoilproductionandmili tary poWer generation. Thus, a need currently exists for a lightWeight,small,portable,andruggedgasturbinethatcan provideaverysimplepoWergenerationaltemative.ItWould beasigni?cantadvancementinthearttoprovideagas turbine that incorporates only one rotating part and has no lube oil or sealed gas requirements so that manufacturing, maintenance, repair, and replacement costs are loW. Such a design Would be highly portable, able to operate in rugged environments on a Wide range of fuels, and tolerant of ingestion of large particle matter such as sand or dirt. SUMMARY OF THE INVENTION A singleWheelradial?oWgasturbineinaccordanceWith the present invention comprises a single rotor Wheel having acentrifugal?oW compressorsectionatitsinnerportionand a centrifugal radially outWard ?oW turbine section at its outer portion. The compressor and turbine sections are locatedonthesamesideoftheWheel.TheWheel,Whichis preferably in the form of a relatively thin disk, is directly coupled to a generator/starter. A radially outWard ?oW combustor section and a noZZle section are mounted on the interior of a stationary shroud facing the Wheel. The air ?oW through the gas turbine of the present inventionisgenerallyradial.Air?oW entersthegasturbine axially through an opening in the central portion of the shroud, then the air is turned radially outWard through the centrifugalcompressor.Fromthecompressorsection,theair ?oWentersthestationaryradialcombustionsectionWhereit is heated using direct combustion via fuel injectors. If desired,Watermay beinjectedradiallydoWnstreamfromthe fuel injectors to achieve signi?cant poWer augmentation, NO reduction,andmetaltemperaturemoderation.Station aryXnoZZlevanesradiallydoWnstreamfromthecombustion sectionthenturntheair?oW sharplytoWardthetangential direction and direct the How onto turbine blades in the turbinesectioninordertodrivetheWheel,andtheexcess rotational energy (poWer) is absorbed by the generator. Itisanobjectofthepresentinventiontoprovideasimple, compact, inexpensive gas turbine. It is another object of the present invention to provide a highlyportablegasturbine. It is a further object of the present invention to provide a gasturbinethatiscapableofoperatingonaWiderangeof fuels. It is another object of the present invention to provide a gas turbine that is capable of operating in rugged environ ments. Itisyetanotherobjectofthepresentinventiontoprovide a gas turbine With a high tolerance for ingestion of particles such as sand and dirt. Simple cycle gas turbines consist of three principal com ponents: a compressor, a combustor, and a turbine. The compressor ingests and compresses ambient air, the com bustor heats that air by fuel combustion, and the turbine expands the resulting hot air to generate mechanical shaft 40 output poWer. This open thermodynamic compression-com bustion-expansion process is also called the Brayton ther modynamic cycle. Brayton cycle industrial gas turbines are WidelyusedinapplicationsrangingfrompoWergeneration togascompression. Modern smallindustrialgasturbinesaretechnicallycom plex machines, consisting of multiple rotating parts, bear ings, seals, lube oil systems, and sophisticated electronic controls.Mostgasturbinesabove500kWoutputpoWer employaxialcompressorandaxialturbinedesign;i.e.,the50 air?oW folloWs primarily along the direction of the axis of thegasturbineshaft.Thistypeofdesignisadirectevolution fromtheairplanejetengineandclearlyprovidesthehighest aerodynamic ef?ciency. HoWever, the axial design does not provideloWestWeight,smalldimensions,portability,orease ofmaintanence.As amatteroffact,modern axial?oW gas turbines are so technically sophisticated that a user cannot performeventhemostbasicrepairs,diagnostics,andtrouble shooting Without the gas turbine manufacturer’s participa tion.Additionally,althoughtheyareoptimiZedforhighest60 ef?ciency, most modern gas turbines do not alloW use of a Wide range of fuels and cannot handle severe environmental conditions. Portability, fuel ?exibility, and ruggedness are sacri?ced for ef?ciency. While this may be desirable for mostpermanentlyinstalledlargepoWerplantapplications,it 65 is not practical for small portable poWer generation appli cations. 45 55

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