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Appl. Sci. 2020, 10, 6824 10 of 13 Figure 10. Predicted unbalance response at the two bearings (ISO G2.5). 4.5. Pump-Drive Turbine Operating Test 4.5. Pump-Drive Turbine Operating Test Figure 11 shows the bearings and rotor of the manufactured pump-drive turbine. The internal Figure 11 shows the bearings and rotor of the manufactured pump-drive turbine. The internal flowpathwasdesignedsuchthatpressurizedliquidCO suppliedfromtheoutsidecanbesupplied flow path was designed such that pressurized liquid CO22 supplied from the outside can be supplied to the radial and thrust bearings and discharged to the outside. As shown in the figure, the thrust to the radial and thrust bearings and discharged to the outside. As shown in the figure, the thrust bearing consists of six recesses; five supply holes were made in each recess. The radial and thrust bearing consists of six recesses; five supply holes were made in each recess. The radial and thrust bearings were made of brass and the rotor was made of STS 420. The pump and turbine impeller were bearings were made of brass and the rotor was made of STS 420. The pump and turbine impeller attached to both sides of the rotor through a tie rod, as shown in Figure 11b. In addition, to measure were attached to both sides of the rotor through a tie rod, as shown in Figure 11b. In addition, to the shaft vibration, proximity probes were installed vertically and horizontally near the turbine-side measure the shaft vibration, proximity probes were installed vertically and horizontally near the radialbearing.Thismanufacturedpump-driveturbinewasinstalledonthe250kWsCO testcycle turbine-side radial bearing. This manufactured pump-drive turbine was installed on the 2520 kW sCO2 facility in KIMM, as shown in Figure 12, and an operation test was conducted. To supply pressurized test cycle facility in KIMM, as shown in Figure 12, and an operation test was conducted. To supply liquidCO tothebearing,aCO pumpwasalsoinstalledinthetestcycleandpipingwasconstructed pressurize2 d liquid CO2 to the b2earing, a CO2 pump was also installed in the test cycle and piping was tothepump-driveturbine.ThesupplypressureoftheliquidCO forthebearingis70barandbearing constructed to the pump-drive turbine. The supply pressure o2f the liquid CO2 for the bearing is 70 11 of 14 discharge pressure is maintained at 60 bar. bar and bearing discharge pressure is maintained at 60 bar. (a) (b) Appl. Sci. 2020, 10, x FOR PEER REVIEW Figure11..Pump-driveturbineassembly..(a)Radialandthrustbeariing;;((b))Rottorandiimpelllerr.. (a) (b) Fiigurree1122..TTeessttlloopfforrpump--drriivetturrbiine..((aa))TTessttlloopfforrssuperrcriittiicallCO2 ccyycclele;;((b))Pump--drriivee tturrbiineemodulle.. Inthetest,high-temperature,high-pressureCO (84bar,136◦C)generatedthroughapumpanda 2 In the test, high-temperature, high-pressure CO2 (84 bar, 136 °C) generated through a pump and heater (boiler) was supplied to the drive turbine; the flow rate was adjusted through a valve to increase a heater (boiler) was supplied to the drive turbine; the flow rate was adjusted through a valve to the rotating speed. The discharged high0temperature CO from the drive turbine flowed into the 2 increase the rotating speed. The discharged high0temperature CO2 from the drive turbine flowed into cooler(condenser).Afterflowingthroughthecooler,CO passedthroughtheliquidseparatorand 2 the cooler (condenser). After flowing through the cooler, CO2 passed through the liquid separator flowed into the pump. and flowed into the pump. Figure 13 shows the rotor vibration measured by the displacement sensor installed near the turbine Figure 13 shows the rotor vibration measured by the displacement sensor installed near the side radial bearing with increase in rotating speed to the rated speed of 21,000 rpm. In the figure, turbine side radial bearing with increase in rotating speed to the rated speed of 21,000 rpm. In the waterfall diagrams of the vibration amplitude in the vertical and horizontal direction are presented. figure, waterfall diagrams of the vibration amplitude in the vertical and horizontal direction are presented. No subsynchronous vibration is found in the entire speed range, indicating that the hydrostatic bearing is operating in a stable state, as predicted in Figure 8. It was also observed that 1X synchronous vibration was dominant for the entire test speed range and no critical speed was present under the rated speed. This is consistent with the predicted rotordynamic analysis results shown in Figure 9. In addition, the measured vibration amplitude in the x-direction was similar to 2PDF Image | Development of Pump-Drive Turbine Module Super CO2 Application
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