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Appl. Sci. 2020, 10, x FOR PEER REVIEW 3 of 14 Appl. Sci. 2020, 10, 6824 3 of 13 to the development of a pump-drive turbine module for sCO2 cycle application with hydrostatic bearings using liquid CO2 as lubricant. The proposed design is unique and quite favorable because stable operation is possible due to the high stiffness and damping of the hydrostatic bearing and there stable operation is possible due to the high stiffness and damping of the hydrostatic bearing and there is no oil contamination on the working fluid by using liquid CO2 as the lubricant. It is known that is no oil contamination on the working fluid by using liquid CO2 as the lubricant. It is known that most oils dissolve well in sCO2; thus, for reliable operation of the cycle, a CO2 purity control system most oils dissolve well in sCO2; thus, for reliable operation of the cycle, a CO2 purity control system is necessary when using oil lubrication bearings. This paper presents a design approach for a rotor is necessary when using oil lubrication bearings. This paper presents a design approach for a rotor bearing system with hydrostatic bearings for sCO2 turbomachinery application. The detailed design bearing system with hydrostatic bearings for sCO2 turbomachinery application. The detailed design parameters for the rotor-bearing system were provided. We performed bearing performance parameters for the rotor-bearing system were provided. We performed bearing performance prediction prediction and rotordynamic analysis of the pump-drive turbine module. In addition, to show the and rotordynamic analysis of the pump-drive turbine module. In addition, to show the viability of viability of the designed pump-drive turbine in sCO2 cycle applications, we conducted operating tests the designed pump-drive turbine in sCO2 cycle applications, we conducted operating tests in a sCO2 in a sCO2 test facility. test facility. 2. Pump-Drive Turbine Module Design Figure 1 provides a schematic diagram of the pump-drive turbine module for sCO2 cycle 2 application. Ass shown iin tthe ffiigure,, the pump is driven by a drive turbine directly connected to a rotor; therrottorrisissusupppoortretdedbybya saesteotfohfyhdyrodsrtoasttiactbiceabreinargisn.gDsu. rDinugrionpgeroapteiornat,ihoing,hh-tiegmh-ptemraptuereataunrde hanigdhh-pigrehs-spurreessCuOre2 CisOsupispsliuepdptloiedrtivoedtrhiveetuthrbeitnuer,blienaed,ilnegadtointghetogtehneergaetnioenraotifoandorfivaidnrgivfoinrcgef,oarncde, tahnedrethbeyreinbcyreinacsrienagsitnhgetphreepssruesrseuoref tohfethleiqluiqiduiCdOC2Ofloflwoiwnignginitnotoththeeppuumpp..TThheeppump--drriiveturbine 2 module iissininsstatallleleddininthtehveevrteicrtailcdalirdecirtieocnti;otnh;e tphuemppuims passisemasbslemd batletdheabtotthtoemb,otthtoemtu,rbthineetiusrlboicnaeteids laotctahtedtoapt, tahnedtotwp,oarnaditawl oberaardiniagls baenadrinagtshraunsdt baeathrirnugstabreaprliancgedarbeeptwlaecend tbhetmw.eeTnhethbeema.riTnhges bsueparpionrgtsinsgutphpeorrottionrgctohmeproritsoertcwoomrpadrisael btweaorirnagdsialnbdeaprianigrsofatnhdruaspt baeiraroifntghsr.uBsetcbaeuasreinitgws.aBseincastuasleleidt wanads idnrsitvaellnedinatnhdedvreivrteincailndtihrecvtieornti,cathlediwreecitgiohnt,otfhethweeriogthationfgthbeodroytawtiansgsbuopdpyorwteads sbuyptphoertehdrubsyt tbheeartihnrgus.tTbheaerpinugms.pT-dhreivpeumtuprb-dinreivmeotudrublienewmasodeusliegwneadstdoeosipgenreadtetoinotpherKatIeMinMth2e50KkIMWMsC2O50kteWst 2 2 sfaCcOili2ttye;sthfeacoiplietyra;tihnegocpoenrdatiitniogncsoanrdeidtieotnesrmarieneddetbeyrmcyinceledabnyaclyscilseoafntahleysiismopflteheresciumppelreartedcuRpaenraktiende Rankine cycle [6]. The rated speed of the pump-drive turbine was 21,000 rpm, and it was designed to cycle [6]. The rated speed of the pump-drive turbine was 21,000 rpm, and it was designed to generate generate a pump power of 143 kW at the rated speed. a pump power of 143 kW at the rated speed. Figure 1. Pump-drive turbine module. Figure 1. Pump-drive turbine module. Figure 2 shows a schematic diagram of a hydrostatic radial bearing for a pump-drive turbine. Figure 2 shows a schematic diagram of a hydrostatic radial bearing for a pump-drive turbine. From a CO2 pump installed outside of the pump-drive turbine, the bearing was supplied with liquid From a CO2 pump installed outside of the pump-drive turbine, the bearing was supplied with liquid CO2 at a pressure of 70 bar and temperature of 20 ◦C. The bearing discharge pressure was maintained CO2 at a pressure of 70 bar and temperature of 20 °C. The bearing discharge pressure was maintained at 60 bar. An orifice restrictor was installed as a flow control device and a recess was machined around at 60 bar. An orifice restrictor was installed as a flow control device and a recess was machined the supply hole to enhance the bearing’s load capacity. As shown in the figure, two rows of recesses around the supply hole to enhance the bearing’s load capacity. As shown in the figure, two rows of were machined in the axial direction, and 12 supply holes were created in the circumferential direction recesses were machined in the axial direction, and 12 supply holes were created in the circumferential for each row. The axial recess location was selected such that the land width ratio equals 0.25. Table 1 shows the other design parameters of the radial bearing.PDF Image | Development of Pump-Drive Turbine Module Super CO2 Application
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