Waste-heat recovery system

Abstract

A waste-heat recovery system for a waste-heat source includes an ORC (Organic-Rankine Cycle) postconnected thereto, the waste-heat source being in connection with the heating device of the ORC, as well as with an expansion machine, coupled to a generator, for steam expansion in the ORC, which has magnetic bearings with an associated control device and a power supply via a direct current intermediate circuit of a generator frequency converter. The unit made up of the expansion machine, the generator and the frequency converter is cooled by the coolant from the ORC circuit.

1 - 7 . (canceled) 
     
     
         8 . A waste-heat recovery system implementing an ORC (Organic-Rankine Cycle) for a waste-heat source, comprising:
 a heating device in connection with the waste-heat source;   a generator;   an expansion machine coupled to the generator, wherein the expansion machine is in connection with the waste-heat source and configured for steam expansion in the ORC, and wherein the expansion machine has magnetic bearings with an associated control device and a power supply via a direct current intermediate circuit of a generator frequency converter; and   an ORC circulation conduit channeling a coolant;   wherein a unit which is cooled by the coolant from the ORC circulation conduit is formed by the expansion machine, the generator, and the frequency converter.   
     
     
         9 . The waste heat recovery system as recited in  claim 8 , further comprising:
 a feeding pump connected to the ORC circulation conduit channeling a coolant, wherein a cool, liquid coolant is withdrawn downstream from the feeding pump and supplied for cooling to the unit formed by the expansion machine, the generator, and the frequency converter.   
     
     
         10 . The waste heat recovery system as recited in  claim 9 , wherein the cool, liquid coolant is withdrawn downstream from the feeding pump and conveyed to the expansion machine for cooling the bearings. 
     
     
         11 . The waste heat recovery system as recited in  claim 9 , further comprising:
 a condenser on an intake side, wherein a heated coolant emerging from the unit formed by the expansion machine, the generator, and the frequency converter is conveyed to the condenser.   
     
     
         12 . The waste heat recovery system as recited in  claim 9 , further comprising:
 a temperature monitoring device linked to a superposed control device, wherein the temperature monitoring device (i) measures temperature values at points within the unit which is cooled, (ii) compares the measured temperature values to specified setpoint values, and (iii) controls a throughput of the coolant as a function of a result of the comparison.   
     
     
         13 . The waste heat recovery system as recited in  claim 12 , wherein separate control circuits are provided for component elements of the unit which is cooled, in order to control the throughput of the coolant. 
     
     
         14 . The waste heat recovery system as recited in  claim 13 , wherein valves for control of the throughput of the coolant are provided in the component elements of the unit which is cooled.