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ESL-IE-81-04-90 enclosed within a single housing. R-113 is the only fluid within the machinery housing, which is designed and fabricated as an ASME Section 8 pres sure vessel. The shaft seals and shaft couplings necessary in a conventional turbine-generator machinery train are not required in this concept. The salient features of this ORC turbine-generator design are summarized in Table 6. D Figure 2 Schematic of Machinery Design Approach TABLE 6 MAJOR FEATURES OF TURBINE-GENERATOR UNIT Principle cycle machines integrated in a single unit Turbine - radial inflow Generator - induction type, 4l60V, 30 Main cycle feed pump - centrifugal Bearings lubricated by liquid R-113 cycle fluid Generator cooled by R-113 cycle fluid Operating speed - 3640 rpm Standardized configuration serves appli cations from 750 kW to 2500 kW A cross section of the unit is shown in Figure 3. The machine operates with the shaft vertical, feed pump and thrust bearing at the top, turbine at the bottom, generator centrally located between the journal bearings. This orientation provides three advantages: 1. Gravity flow of liquid leakage from the pump and upper bearings provides a simple and ample cooling system for the generator; 2. Generator coolant and bearing liquid flows can be easily drained out of the machine to the system condenser, at a lower elevation. 3. Journal bearings are very lightly loaded during startup and shutdown, to minimize rubbing contact. 802095-1 MTl 19509 Figure 3 Cross Section of Turbine-Generator-Pumpl Unit Both journal bearings are tilting-pad type, and tI"Je main and reverse thrust bearings are self-equaliz~ng tilting-pad types. Bearing lubricant liquid is ! supplied through a 25 micron filter by the syste~ condensate pump during start-up, and by the main i feed pump during normal operation. The rotor wei~ht is supported during startup and shutdown by a hyd~o static pressure differential across the thrust i runner. When the rotor approaches 3600 rpm, this! pressure differential is equalized by an internwl valve actuated by feedpump discharge pressure. B~th journal and thrust bearings are thereby relieved pf the rotor weight during startup and shutdown. PROTOTYPE CONSTRUCTION AND TEST RESULTS , A 1000 kH prototype machine has been built and tested with R-113 under full load conditions. Figure 4 I shows the rotor assembly for this machine. At t~ left end of the shaft is the 36" diameter fully i shrouded radial-inflow turbine wheel, which is am investment casting. The wheel is attached to the' shaft by an interference pilot fit and bolted flange connection. The shaft is a SAE4l45 alloy steel forging. The induction generator rotor is secured to the shaft by a heavy shrink fit and a key, and, is located axially by a shoulder on the shaft. The' thrust runner is a separate piece clamped to the shaft by a locknut and a precision-ground locating shoulder on the shaft. The feed pump impeller is installed on the right-hand end of the shaft with a 519 Proceedings from the Third Industrial Energy Technology Conference Houston, TX, April 26-29, 1981PDF Image | ORC WASTE HEAT RECOVERY IN REFINERIES AND CHEMICAL Process
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