A rankine cycle arrangement comprising an ejector

Abstract

A rankine cycle arrangement, the arrangement ( 100 ) comprising: an expander ( 1 ), a heat exchanger ( 2 ) connected to an inlet channel ( 3 ) of the expander ( 1 ) for heating working fluid to be fed in the expander ( 1 ), a condenser ( 5 ) connected to an outlet channel ( 6 ) of the expander ( 1 ) for cooling working fluid expanded in the expander ( 1 ), and a pump ( 8 ) connected to an outlet ( 9 ) of the condenser and to an inlet ( 10 ) of the heat exchanger for rising pressure of working fluid. The arrangement further comprises an ejector ( 11 ) comprising a high-pressure inlet ( 12 ), a low-pressure inlet ( 13 ), and an outlet channel ( 14 ). The ejector ( 11 ) is connected in parallel with the expander ( 1 ) such that a first portion of working fluid is capable to bypass the expander through said ejector ( 11 ).

1 - 12 . (canceled) 
     
     
         13 . A rankine cycle arrangement, the arrangement comprising:
 an expander for converting heat energy of working fluid into mechanical energy,   a heat exchanger connected to an inlet channel of the expander for heating working fluid to be fed in the expander, the heat exchanger comprising a receiving channel being arranged to receive heat energy,   a condenser connected to an outlet channel of the expander for cooling working fluid expanded in the expander, the condenser comprising a receiving channel being arranged to receive cooling fluid,   a pump connected to an outlet of the condenser and to an inlet of the heat exchanger for rising pressure of working fluid,   an ejector comprising a high-pressure inlet, a low-pressure inlet, and an outlet channel, the ejector being connected in parallel with the expander such that a first portion of working fluid is capable to bypass the expander through said ejector, and wherein   the outlet channel of the expander is connected to the low-pressure inlet,   the outlet channel of the ejector is connected to an inlet of the condenser for conducting working fluid from the ejector to the condenser, and   an outlet of the heat exchanger is connected to the high-pressure inlet.   
     
     
         14 . The arrangement as claimed in  claim 13 , wherein the expander comprises a turbine. 
     
     
         15 . The arrangement as claimed in  claim 13 , wherein said working fluid is carbon dioxide (CO 2 ). 
     
     
         16 . The arrangement as claimed in  claim 13 , wherein said working fluid comprises refrigerant, ammonia, hydrocarbon, alcohol or combination thereof. 
     
     
         17 . The arrangement as claimed in  claim 13 , wherein the heat exchanger is a counterflow plate heat exchanger. 
     
     
         18 . The arrangement as claimed in  claim 13 , wherein the condenser is a counterflow plate heat exchanger. 
     
     
         19 . The arrangement as claimed in  claim 13 , wherein at least one of the pumps is a centrifugal pump or a plunger pump. 
     
     
         20 . The arrangement as claimed in  claim 13 , comprising at least two ejectors arranged in series, wherein
 the outlet channel of a preceding ejector is connected to the high-pressure inlet of the following ejector.   
     
     
         21 . The arrangement as claimed in  claim 13 , comprising a controlling means arranged to control the first portion of working fluid in relation to a second portion of working fluid being fed in the expander. 
     
     
         22 . The arrangement as claimed in  claim 13 , comprising a generator for generating electricity, and arranged to be rotated by the expander. 
     
     
         23 . The arrangement as claimed in  claim 13 , comprising
 a first conduit system arranged to connect in series:   the outlet channel of the ejector,   the condenser,   the pump,   the heat exchanger, and   the inlet channel of the expander,   
       and further comprising
 a second conduit system arranged to connect with the first conduit system between said heat exchanger and said inlet channel of the expander, the second conduit system further arranged to connect to the high-pressure inlet of the ejector. 
 
     
     
         24 . The arrangement as claimed in  claim 13 , comprising
 a first conduit system arranged to connect in series:   the outlet channel of the ejector,   the condenser,   the pump,   the heat exchanger, and   the inlet channel of the expander,   
       and further comprising
 a third conduit system arranged to connect with the first conduit system between the condenser and the pump, the third conduit system comprising 
 a second pump, 
 a second heat exchanger, 
 the third conduit system further arranged to connect to the high-pressure inlet of the ejector.