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TABLE 1. The design specifications of the turbo-expander Inlet pressure Inlet temperature Outlet pressure Outlet temperature Flow rate Rotational speed Efficiency Impeller diameter Brake type Bearing type 1.0 MPa 68 K 0.5 MPa 56.6 K 0.15 kg/sec 1550 rev/sec 65 % 25 mm Alternator loaded Active magnetic bearings Our magnetic bearing turbo-expanders have been already applied for several air separation plants and their reliability has been confirmed sufficiently. In the case of open type impeller, we can choose the way of 5-axis numerically controlled milling machine and the manufacturing cost becomes moderate, but the leakage loss at the impeller shroud clearance should be considered carefully. The new turbo-expander was tested at the process pressure of 1 MPa ~ 0.5 MPa in the prototype refrigerator. Though the reciprocating compressor has a flow rate of 0.3 kg/sec at 2 MPa ~ 1 MPa, it has smaller flow rate of 0.15 kg/sec at 1 MPa ~ 0.5 MPa. And also the flow rate of the turbo-expander decreases to 0.15 kg/sec. TABLE 1 shows the design specifications of the turbo-expander. FIGURE 1 shows the cross-sectional drawing of the turbo-expander. Turbine- housing Connectors Upper- radial bearing Alternator Water- cooling jacket Axial- bearings Lower- radial bearing Turbine shaft Insulator Turbine impeller Inlet Outlet FIGURE 1. The cross-sectional drawing of the turbo-expander 897PDF Image | NEON CRYOGENIC TURBO-EXPANDER WITH MAGNETIC BEARINGS
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