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US 2011/0005237A1 Jan.13,2011 32 is located downstream of bypass line 36; in alternative embodiments, eductor line 32 may be located upstream of bypassline36. [0014] Byplacingeductorline32upstreamofturbineinlet liquidsuckedoutofdischargehousing42isprimarilyoil,the valve26,eductorline32isabletocontinuouslysupplyrefrig erant 22 to eductor system 20 Whenever refrigerant 22 is circulating through system 10, regardless of the mode of turbine 18. Even ifturbine 18 is in a bypass mode during startup and refrigerant 22 from evaporator 16 is being divertedthroughbypassline36,refrigerant22may stilHow to eductor system 20. [0015] InotherdesignsofanORCsystem,theeductorline may commonly be connected to the turbine such that the refrigerantsourcefortheeductorsystemisdeliveredfromthe turbine. For example, the eductor line may be connected to the high pressure volute such that the eductor system uses refrigerant that Was ?oWing through the high pressure volute oftheturbine.Inthosedesigns,hoWever,theeductorsystem isonlyoperableWhenrefrigerantfromtheevaporatorisHow ing through the turbine. As explained above in reference to FIG. 1, during a startup of the system, the vaporiZed refrig erantfromtheevaporatorispreventedfrom?oWingthrough the turbine. The refrigerant instead ?oWs through the bypass line, and then to the condenser. Thus, When the eductor sys tem is dependent on refrigerant from the turbine, it is not feasible to remove the oil from the turbine during a bypass or startupmode oftheturbine. [0016] Thestartupmode,hoWever,maybeanimportant time for removing oil from those areas of the turbine sur roundingtheimpeller(i.e.thehighpressurevoluteanddis charge housing). Some of the equipment inside the turbine may bedamagediftheturbinestartsupWithoilintheseareas. Moreover, during operation and particularly during shut doWnoftheORC system,theoilinsidetheturbinecommonly migrates to the discharge housing and the high pressure volute. [0017] Again,becauseeductorline32ofsystem10is locatedupstreamofturbineinletvalve26andreceivesrefrig erant 22b directly from evaporator 16, eductor system 20 is able to remove oil from turbine 18 during all modes of run ning system 10. Eductor line 32 receives a small portion of refrigerant 22 from evaporator 16 and thus has a minimal impact on operation and ef?ciency of turbine 18. For example,inoneembodiment,lessthanoneWeightpercentof refrigerant 22 from evaporator 16 ?oWs to line 32; and in a preferred embodiment, approximately 0.2 Weight percent ?oWs to line 32. In the embodiment shoWn in FIG. 2, eductor line 32 does not include a valve since line 32 is con?gured to receive refrigerant 22 Whenever refrigerant 22 is ?oWing throughORC system10.ItisrecogniZedthateductorline32 may includeacontrolvalve.As shoWninFIG.2,eductorline 32may include?lter60,Whichiscon?guredtoremovepar ticulatesfromrefrigerant22. liquidmay containsomeamountofrefrigerant.)Secondline 68iscon?guredtodeliverrefrigerant22toprimary?oW inlet 78 of second eductor 64. Line 80 is connected to secondary ?oW inlet 82 of second eductor 64 and delivers liquid removed from high pressure volute 44 of turbine 18. Liquid extractedfromhighpressurevolute44ismostlyoil;hoWever, theliquidmay includesome oftherefrigerant?oWing inside turbine 18. After ?oWing through eductors 62 and 64, the refrigerant and the oil collectively travel to oil sump 56 through line 84. The refrigerant, Which is vapor, may be recycled back to discharge housing 42 from sump 56 via line 86. [0020] Althougheductorsystem20,asshoWninFIG.2, includestWoeductors,itisrecogniZedthateductorsystem20 may operate With only ?rst eductor 62. Because eductor line 32 is located upstream of turbine inlet valve 26, eductor line 32may deliverrefrigerantto?rsteductor62atalltimes.As such,?rsteductor62iseffectiveatremovingoilfromturbine 18,particularlyduringastartupofturbine18.By removing oilfromdischargehousing42priortostartingupturbine18, system 10 exhibits a decrease in a number of failed star‘tups, ascomparedtoanORC systeminWhichtheeductorsystem is not operable during startup because it is dependent on refrigerantfromtheturbine. [0021] Althoughsecondeductor64isnotrequired,itis recogniZedthatusingsecondeductor64,incombinationWith ?rst eductor 62 and eductor line 32, further increases the effectiveness of system 10 for removing oil from turbine 18. Asexplainedabove,oilmaycollectinbothdischargehousing 42 and high pressure volute 44. Second eductor 64 is able to remove oil from high pressure volute 44, Where itcommonly collectsoncetheoilisseparatedfromthevaporiZedrefriger ant inside volute 44. Using a tWo-eductor system improves overallrecoveryoftheoilbecausetheoilmay beremoved from both areas around impeller 40 Where itcan accumulate. [0022] Althoughthisdisclosurefocusesontheuseofeduc tor line 32 and eductor system 20 during a startup of turbine 18, it is recogniZed that the oil removal system described herein is used to remove oil from the discharge housing and thehighpressurevoluteatanypointthatORC systemis running. This includes an operational mode of the turbine When refrigerant from the evaporator is ?oWing through the turbine. [0023] Althoughthepresentinventionhasbeendescribed With reference to preferred embodiments, Workers skilled in theartWillrecogniZethatchangesmay bemade informand detail Without departing from the spirit and scope of the invention. 1.Anoil-removalsystemforpreventingfailuresinan organic rankine cycle (ORC) system having an evaporator, a turbine, a condenser and a pump, and con?gured to circulate arefrigerantthroughtheORC system,theoil-removalsystem [0018] IntheembodimentshoWninFIG.2,eductorsystem 20 includes ?rst eductor 62 and second eductor 64, Which operate as venturi devices, and each includes a primary ?oW inletandasecondary?oW inlet.Ineacheductor,highpressure refrigerantfromevaporator16?oWsthroughtheprimary?oW comprising: inlet, creating enough suction force to draW liquid out of turbine 18. [0019] Eductorsystem20alsoincludes?rstline66and second line 68, both of Which are connected to eductor line 32. First line 66 is con?gured to deliver refrigerant 22 to primary?oW inlet70of?rsteductor62.Secondary?oW inlet aneductorlinelocatedupstreamoftheturbineandcon?g ured to receive a portion of the refrigerant exiting the evaporator;and an eductor system con?gured to receive the refrigerant from the eductor line and extract liquid out of the tur bine. 72 of ?rst eductor 62 is connected to line 74 and delivers oil 76, Which isremoved from discharge housing 42 ofturbine 18,through?rsteductor62.(ItisrecogniZedthatalthoughthePDF Image | OIL REMOVAL FROM A TURBINE OF AN ORGANIC RANKINE CYCLE
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