Advanced Potassium Rankine Power Conversion Sys [space by PDF

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One of the long–duration tests featured an inlet temperature of 1088 K and an outlet vapor quality of 92%. This indicates that there is a good chance that potassium vapor turbines can be designed to operate with reasonable amounts of wet potassium in the vapor stream. 2. Operation of turbines in potassium. A multi-stage, axial flow turbine is used in this design. The turbine uses nine stages and a tilting pad bearing system lubricated with 750 K liquid potassium. The turbine produces a shaft power of 127 kW operating at approximately 55,000 rpm.

Stress analyses of the boiler tubes have been initiated at the potassium entrance to the boiler, where the temperature difference between the potassium side (liquid at about 26 850 K) and the lithium side (at 1310 K) is 460 K, with a total radial ∆T across the boiler tube wall of over 100 K. An axial temperature difference of 30 K has been calculated at the potassium wet front, where the CHF point is. This temperature difference moves slightly down the tube, as the boiling/vaporization process is a transient process.

7 cm for the 100–kWe unit. Expected pump efficiency is 47% and turbine efficiency is 13% for this system. The turbo-pump operates at approximately 24,000 rpm. 77 MPa pressure. 21 MPa. 84 MPa. Detailed design analysis of the boiler feed pump and turbine were performed using Rocketdyne design codes. Parametric analyses allowed the results to be condensed into performance curves that could be used in ALKASYS-SRPS to predict turbopump characteristics. The performance of small axial–flow partial admission turbopumps operating on potassium vapor can be estimated using Fig.

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Advanced Potassium Rankine Power Conversion Sys [space reactor designs]

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