EP2179145B1 - Oil removal from a turbine of an organic rankine cycle (orc) system - Google Patents
Oil removal from a turbine of an organic rankine cycle (orc) system Download PDFInfo
- Publication number
- EP2179145B1 EP2179145B1 EP07810848.7A EP07810848A EP2179145B1 EP 2179145 B1 EP2179145 B1 EP 2179145B1 EP 07810848 A EP07810848 A EP 07810848A EP 2179145 B1 EP2179145 B1 EP 2179145B1
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- European Patent Office
- Prior art keywords
- refrigerant
- turbine
- eductor
- evaporator
- orc
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- 239000003507 refrigerant Substances 0.000 claims description 63
- 239000007788 liquid Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 14
- 239000012530 fluid Substances 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
Definitions
- the present disclosure relates to an organic rankine cycle (ORC) system. More particularly, the present disclosure relates to an improved method and system for recovering oil from a turbine of an ORC system.
- ORC organic rankine cycle
- Rankine cycle systems are commonly used for generating electrical power.
- the rankine cycle system includes an evaporator or a boiler for evaporation of a motive fluid, a turbine that receives the vapor from the evaporator to drive a generator, a condenser for condensing the vapor, and a pump or other means for recycling the condensed fluid to the evaporator.
- the motive fluid in rankine cycle systems is often water, and the turbine is thus driven by steam.
- An organic rankine cycle (ORC) system operates similarly to a traditional rankine cycle, except that an ORC system uses an organic fluid, instead of water, as the motive fluid.
- Oil may be used for lubrication in the ORC system, particularly inside the turbine.
- oil provides lubrication for the bearings of the turbine.
- the oil may migrate to areas of the ORC system where the oil is not desired, such as an area surrounding an impeller of the turbine.
- it may be difficult to recover the oil from these undesired areas. In some cases, the unrecoverable oil may result in failed startups of the ORC system.
- An oil-removal system is used in an organic rankine cycle (ORC) system to prevent failures, particularly during startup, by removing oil from inside a turbine of the ORC system.
- the oil-removal system includes an eductor line located upstream of the turbine and configured to receive a portion of a refrigerant exiting an evaporator of the ORC system.
- the eductor line delivers the refrigerant to an eductor system, which removes the oil from an area surrounding an impeller of the turbine and delivers the oil back to an oil sump.
- An organic rankine cycle (ORC) system may be used to generate electrical power.
- Oil is used within the ORC system to provide lubrication for various pieces of equipment, particularly inside a turbine of the ORC system.
- the oil may travel to other areas of the turbine where the oil is not needed, and in some cases, the oil may be destructive to some of the equipment.
- the system is starting up, if there is oil in certain areas of the turbine, such as the impeller, the oil may result in a system failure.
- This disclosure focuses on a method and system for effectively removing the oil from the turbine during a startup of the ORC system.
- FIG. 1 is a schematic of ORC system 10, which includes condenser 12, pump 14, evaporator 16, turbine 18, and eductor system 20 connected to turbine 18.
- Refrigerant 22 circulates through system 10 and is used to generate electrical power.
- Liquid refrigerant 22a from condenser 12 passes through pump 14, resulting in an increase in pressure.
- High pressure liquid refrigerant 22a enters evaporator 16, which utilizes heat source 24 to vaporize refrigerant 22.
- Heat source 24 may include, but is not limited to, any type of waste heat, including fuel cells, microturbines, and reciprocating engines, and other types of heat sources such as solar, geothermal or waste gas.
- Refrigerant 22 exiting evaporator 16 is a vaporized refrigerant (22b), at which point it passes through turbine inlet valve 26 and into turbine 18. Vaporized refrigerant 22b is used to drive turbine 18, which in turn powers generator 28 such that generator 28 produces electrical power. Vaporized refrigerant 22b exiting turbine 18 is returned to condenser 12, where it is condensed back to liquid refrigerant 22a. Heat sink 30 is used to provide cooling water to condenser 12.
- Eductor system 20 is connected to turbine 18 and is configured to remove oil from those areas of turbine 18 where it may commonly collect.
- eductor line 32 receives a portion of vaporized refrigerant 22b flowing from evaporator 16 and delivers refrigerant 22b to eductor system 20.
- ORC system 10 also includes bypass valve 36 and bypass line 38, which may be used to prevent refrigerant 22b from passing through turbine 18 during a startup.
- turbine 18 temporarily runs in a bypass mode, at which time it does not receive any refrigerant, in order to reach the predetermined operating conditions (i.e. temperature and pressure) for turbine 18.
- refrigerant 22b flows through bypass line 38 and is directed through bypass orifice 39 to increase a temperature of refrigerant 22b, and imitate operating conditions inside turbine 18.
- bypass valve 36 is closed when turbine inlet valve 26 is open, and vice versa.
- FIG. 2 is a schematic of a portion of ORC system 10 from FIG. 1 , including turbine 18, eductor system 20, eductor line 32, turbine inlet valve 26, generator 28, bypass valve 36, and bypass line 38.
- Turbine 18 includes impeller 40, discharge housing 42, and high pressure volute 44.
- Volute 44 is designated as "high pressure voluteā since the volute is at high pressure when turbine 18 is operating. However, volute 44 is at low pressure when system 10 and turbine 18 are in the bypass mode during startup.
- vaporized refrigerant 22b passes through inlet valve 26 into high pressure volute 44, and then through nozzles 46, which impart motive force to impeller 40 to drive shaft 48 inside gear box 50.
- Gears 52 connect drive shaft 48 to generator 28, which uses the shaft energy to generate electrical power.
- Gear box 50 also includes bearings 54, oil sump 56, and oil pump 58.
- Eductor line 32 is located upstream of turbine inlet valve 26, and is configured to receive a portion of vaporized refrigerant 22b exiting evaporator 16 (and flowing to turbine 18). Line 32 then delivers refrigerant 22b to eductor system 20, which is configured to remove liquid (primarily oil) from turbine 18.
- eductor line 32 is located downstream of bypass line 36; in alternative embodiments, eductor line 32 may be located upstream of bypass line 36.
- eductor line 32 By placing eductor line 32 upstream of turbine inlet valve 26, eductor line 32 is able to continuously supply refrigerant 22 to eductor system 20 whenever refrigerant 22 is circulating through system 10, regardless of the mode of turbine 18. Even if turbine 18 is in a bypass mode during startup and refrigerant 22 from evaporator 16 is being diverted through bypass line 36, refrigerant 22 may still flow to eductor system 20.
- the eductor line may commonly be connected to the turbine such that the refrigerant source for the eductor system is delivered from the turbine.
- the eductor line may be connected to the high pressure volute such that the eductor system uses refrigerant that was flowing through the high pressure volute of the turbine.
- the eductor system is only operable when refrigerant from the evaporator is flowing through the turbine.
- the vaporized refrigerant from the evaporator is prevented from flowing through the turbine.
- the refrigerant instead flows through the bypass line, and then to the condenser.
- the startup mode may be an important time for removing oil from those areas of the turbine surrounding the impeller (i.e. the high pressure volute and discharge housing). Some of the equipment inside the turbine may be damaged if the turbine starts up with oil in these areas. Moreover, during operation and particularly during shut down of the ORC system, the oil inside the turbine commonly migrates to the discharge housing and the high pressure volute.
- eductor line 32 of system 10 is located upstream of turbine inlet valve 26 and receives refrigerant 22b directly from evaporator 16, eductor system 20 is able to remove oil from turbine 18 during all modes of running system 10.
- Eductor line 32 receives a small portion of refrigerant 22 from evaporator 16 and thus has a minimal impact on operation and efficiency of turbine 18. For example, in one embodiment, less than one weight percent of refrigerant 22 from evaporator 16 flows to line 32; and in a preferred embodiment, approximately 0.2 weight percent flows to line 32.
- eductor line 32 does not include a valve since line 32 is configured to receive refrigerant 22 whenever refrigerant 22 is flowing through ORC system 10. It is recognized that eductor line 32 may include a control valve. As shown in FIG. 2 , eductor line 32 may include filter 60, which is configured to remove particulates from refrigerant 22.
- eductor system 20 includes first eductor 62 and second eductor 64, which operate as venturi devices, and each includes a primary flow inlet and a secondary flow inlet.
- first eductor 62 and second eductor 64 which operate as venturi devices, and each includes a primary flow inlet and a secondary flow inlet.
- high pressure refrigerant from evaporator 16 flows through the primary flow inlet, creating enough suction force to draw liquid out of turbine 18.
- Eductor system 20 also includes first line 66 and second line 68, both of which are connected to eductor line 32.
- First line 66 is configured to deliver refrigerant 22 to primary flow inlet 70 of first eductor 62.
- Secondary flow inlet 72 of first eductor 62 is connected to line 74 and delivers oil 76, which is removed from discharge housing 42 of turbine 18, through first eductor 62. (It is recognized that although the liquid sucked out of discharge housing 42 is primarily oil, the liquid may contain some amount of refrigerant.)
- Second line 68 is configured to deliver refrigerant 22 to primary flow inlet 78 of second eductor 64.
- Line 80 is connected to secondary flow inlet 82 of second eductor 64 and delivers liquid removed from high pressure volute 44 of turbine 18. Liquid extracted from high pressure volute 44 is mostly oil; however, the liquid may include some of the refrigerant flowing inside turbine 18. After flowing 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.
- eductor system 20 may operate with only first eductor 62. Because eductor line 32 is located upstream of turbine inlet valve 26, eductor line 32 may deliver refrigerant to first eductor 62 at all times. As such, first eductor 62 is effective at removing oil from turbine 18, particularly during a startup of turbine 18. By removing oil from discharge housing 42 prior to starting up turbine 18, system 10 exhibits a decrease in a number of failed startups, as compared to an ORC system in which the eductor system is not operable during startup because it is dependent on refrigerant from the turbine.
- second eductor 64 is not required, it is recognized that using second eductor 64, in combination with first eductor 62 and eductor line 32, further increases the effectiveness of system 10 for removing oil from turbine 18.
- oil may collect in both discharge housing 42 and high pressure volute 44.
- Second eductor 64 is able to remove oil from high pressure volute 44, where it commonly collects once the oil is separated from the vaporized refrigerant inside volute 44.
- Using a two-eductor system improves overall recovery of the oil because the oil may be removed from both areas around impeller 40 where it can accumulate.
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Description
- The present disclosure relates to an organic rankine cycle (ORC) system. More particularly, the present disclosure relates to an improved method and system for recovering oil from a turbine of an ORC system.
- Rankine cycle systems are commonly used for generating electrical power. The rankine cycle system includes an evaporator or a boiler for evaporation of a motive fluid, a turbine that receives the vapor from the evaporator to drive a generator, a condenser for condensing the vapor, and a pump or other means for recycling the condensed fluid to the evaporator. The motive fluid in rankine cycle systems is often water, and the turbine is thus driven by steam. An organic rankine cycle (ORC) system operates similarly to a traditional rankine cycle, except that an ORC system uses an organic fluid, instead of water, as the motive fluid.
- Oil may be used for lubrication in the ORC system, particularly inside the turbine. For example, oil provides lubrication for the bearings of the turbine. During operation of the ORC system, the oil may migrate to areas of the ORC system where the oil is not desired, such as an area surrounding an impeller of the turbine. During a startup of the ORC system, it may be difficult to recover the oil from these undesired areas. In some cases, the unrecoverable oil may result in failed startups of the ORC system.
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- There is a need for an improved method and system for removing the oil from the turbine during the startup of the ORC system.
- An oil-removal system is used in an organic rankine cycle (ORC) system to prevent failures, particularly during startup, by removing oil from inside a turbine of the ORC system. The oil-removal system includes an eductor line located upstream of the turbine and configured to receive a portion of a refrigerant exiting an evaporator of the ORC system. The eductor line delivers the refrigerant to an eductor system, which removes the oil from an area surrounding an impeller of the turbine and delivers the oil back to an oil sump.
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FIG. 1 is a schematic of an organic rankine cycle (ORC) system, including a turbine and an eductor system for removing oil from the turbine. -
FIG. 2 is a schematic of the turbine and the eductor system ofFIG. 1 . - An organic rankine cycle (ORC) system may be used to generate electrical power. Oil is used within the ORC system to provide lubrication for various pieces of equipment, particularly inside a turbine of the ORC system. As the ORC is operating, however, the oil may travel to other areas of the turbine where the oil is not needed, and in some cases, the oil may be destructive to some of the equipment. Moreover, when the system is starting up, if there is oil in certain areas of the turbine, such as the impeller, the oil may result in a system failure. This disclosure focuses on a method and system for effectively removing the oil from the turbine during a startup of the ORC system.
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FIG. 1 is a schematic ofORC system 10, which includescondenser 12,pump 14,evaporator 16,turbine 18, andeductor system 20 connected toturbine 18. Refrigerant 22 circulates throughsystem 10 and is used to generate electrical power.Liquid refrigerant 22a fromcondenser 12 passes throughpump 14, resulting in an increase in pressure. High pressureliquid refrigerant 22a entersevaporator 16, which utilizesheat source 24 to vaporize refrigerant 22.Heat source 24 may include, but is not limited to, any type of waste heat, including fuel cells, microturbines, and reciprocating engines, and other types of heat sources such as solar, geothermal or waste gas. Refrigerant 22 exitingevaporator 16 is a vaporized refrigerant (22b), at which point it passes throughturbine inlet valve 26 and intoturbine 18. Vaporizedrefrigerant 22b is used to driveturbine 18, which inturn powers generator 28 such thatgenerator 28 produces electrical power. Vaporizedrefrigerant 22b exiting turbine 18 is returned tocondenser 12, where it is condensed back toliquid refrigerant 22a.Heat sink 30 is used to provide cooling water to condenser 12. -
Eductor system 20 is connected toturbine 18 and is configured to remove oil from those areas ofturbine 18 where it may commonly collect. As explained in more detail below in reference toFIG. 2 ,eductor line 32 receives a portion of vaporizedrefrigerant 22b flowing fromevaporator 16 and deliversrefrigerant 22b toeductor system 20. - As shown in
FIG. 1 ,ORC system 10 also includesbypass valve 36 andbypass line 38, which may be used to preventrefrigerant 22b from passing throughturbine 18 during a startup. During a startup ofsystem 10,turbine 18 temporarily runs in a bypass mode, at which time it does not receive any refrigerant, in order to reach the predetermined operating conditions (i.e. temperature and pressure) forturbine 18. In that case,refrigerant 22b flows throughbypass line 38 and is directed throughbypass orifice 39 to increase a temperature ofrefrigerant 22b, and imitate operating conditions insideturbine 18. After passing throughbypass orifice 39,refrigerant 22b is directed to condenser 12. In some embodiments,bypass valve 36 is closed whenturbine inlet valve 26 is open, and vice versa. -
FIG. 2 is a schematic of a portion ofORC system 10 fromFIG. 1 , includingturbine 18,eductor system 20,eductor line 32,turbine inlet valve 26,generator 28,bypass valve 36, andbypass line 38.Turbine 18 includes impeller 40,discharge housing 42, andhigh pressure volute 44. (Volute 44 is designated as "high pressure volute" since the volute is at high pressure whenturbine 18 is operating. However,volute 44 is at low pressure whensystem 10 andturbine 18 are in the bypass mode during startup.) During an operational mode ofturbine 18, vaporizedrefrigerant 22b (from evaporator 16) passes throughinlet valve 26 intohigh pressure volute 44, and then throughnozzles 46, which impart motive force to impeller 40 to driveshaft 48inside gear box 50. Gears 52 connectdrive shaft 48 togenerator 28, which uses the shaft energy to generate electrical power.Gear box 50 also includesbearings 54,oil sump 56, andoil pump 58. -
Eductor line 32 is located upstream ofturbine inlet valve 26, and is configured to receive a portion of vaporizedrefrigerant 22b exiting evaporator 16 (and flowing to turbine 18).Line 32 then deliversrefrigerant 22b toeductor system 20, which is configured to remove liquid (primarily oil) fromturbine 18. In the embodiment shown inFIG. 2 ,eductor line 32 is located downstream ofbypass line 36; in alternative embodiments,eductor line 32 may be located upstream ofbypass line 36. - By placing
eductor line 32 upstream ofturbine inlet valve 26,eductor line 32 is able to continuously supply refrigerant 22 toeductor system 20 whenever refrigerant 22 is circulating throughsystem 10, regardless of the mode ofturbine 18. Even ifturbine 18 is in a bypass mode during startup and refrigerant 22 fromevaporator 16 is being diverted throughbypass line 36, refrigerant 22 may still flow toeductor system 20. - In other designs of an ORC system, the eductor line may commonly be connected to the turbine such that the refrigerant source for the eductor system is delivered from the turbine. For example, the eductor line may be connected to the high pressure volute such that the eductor system uses refrigerant that was flowing through the high pressure volute of the turbine. In those designs, however, the eductor system is only operable when refrigerant from the evaporator is flowing through the turbine. As explained above in reference to
FIG. 1 , during a startup of the system, the vaporized refrigerant from the evaporator is prevented from flowing through the turbine. The refrigerant instead flows through the bypass line, and then to the condenser. Thus, when the eductor system is dependent on refrigerant from the turbine, it is not feasible to remove the oil from the turbine during a bypass or startup mode of the turbine. - The startup mode, however, may be an important time for removing oil from those areas of the turbine surrounding the impeller (i.e. the high pressure volute and discharge housing). Some of the equipment inside the turbine may be damaged if the turbine starts up with oil in these areas. Moreover, during operation and particularly during shut down of the ORC system, the oil inside the turbine commonly migrates to the discharge housing and the high pressure volute.
- Again, because
eductor line 32 ofsystem 10 is located upstream ofturbine inlet valve 26 and receives refrigerant 22b directly fromevaporator 16,eductor system 20 is able to remove oil fromturbine 18 during all modes of runningsystem 10.Eductor line 32 receives a small portion of refrigerant 22 fromevaporator 16 and thus has a minimal impact on operation and efficiency ofturbine 18. For example, in one embodiment, less than one weight percent of refrigerant 22 fromevaporator 16 flows toline 32; and in a preferred embodiment, approximately 0.2 weight percent flows toline 32. In the embodiment shown inFIG. 2 ,eductor line 32 does not include a valve sinceline 32 is configured to receive refrigerant 22 whenever refrigerant 22 is flowing throughORC system 10. It is recognized thateductor line 32 may include a control valve. As shown inFIG. 2 ,eductor line 32 may includefilter 60, which is configured to remove particulates from refrigerant 22. - In the embodiment shown in
FIG. 2 ,eductor system 20 includesfirst eductor 62 andsecond eductor 64, which operate as venturi devices, and each includes a primary flow inlet and a secondary flow inlet. In each eductor, high pressure refrigerant fromevaporator 16 flows through the primary flow inlet, creating enough suction force to draw liquid out ofturbine 18. -
Eductor system 20 also includes first line 66 andsecond line 68, both of which are connected toeductor line 32. First line 66 is configured to deliver refrigerant 22 toprimary flow inlet 70 offirst eductor 62.Secondary flow inlet 72 offirst eductor 62 is connected to line 74 and deliversoil 76, which is removed fromdischarge housing 42 ofturbine 18, throughfirst eductor 62. (It is recognized that although the liquid sucked out ofdischarge housing 42 is primarily oil, the liquid may contain some amount of refrigerant.)Second line 68 is configured to deliver refrigerant 22 toprimary flow inlet 78 ofsecond eductor 64.Line 80 is connected tosecondary flow inlet 82 ofsecond eductor 64 and delivers liquid removed fromhigh pressure volute 44 ofturbine 18. Liquid extracted fromhigh pressure volute 44 is mostly oil; however, the liquid may include some of the refrigerant flowing insideturbine 18. After flowing througheductors oil sump 56 throughline 84. The refrigerant, which is vapor, may be recycled back to dischargehousing 42 fromsump 56 vialine 86. - Although
eductor system 20, as shown inFIG. 2 , includes two eductors, it is recognized thateductor system 20 may operate with onlyfirst eductor 62. Becauseeductor line 32 is located upstream ofturbine inlet valve 26,eductor line 32 may deliver refrigerant tofirst eductor 62 at all times. As such,first eductor 62 is effective at removing oil fromturbine 18, particularly during a startup ofturbine 18. By removing oil fromdischarge housing 42 prior to starting upturbine 18,system 10 exhibits a decrease in a number of failed startups, as compared to an ORC system in which the eductor system is not operable during startup because it is dependent on refrigerant from the turbine. - Although
second eductor 64 is not required, it is recognized that usingsecond eductor 64, in combination withfirst eductor 62 andeductor line 32, further increases the effectiveness ofsystem 10 for removing oil fromturbine 18. As explained above, oil may collect in both dischargehousing 42 andhigh pressure volute 44.Second eductor 64 is able to remove oil fromhigh pressure volute 44, where it commonly collects once the oil is separated from the vaporized refrigerant insidevolute 44. Using a two-eductor system improves overall recovery of the oil because the oil may be removed from both areas around impeller 40 where it can accumulate. - Although this disclosure focuses on the use of
eductor line 32 andeductor system 20 during a startup ofturbine 18, it is recognized that the oil removal system described herein is used to remove oil from the discharge housing and the high pressure volute at any point that ORC system is running. This includes an operational mode of the turbine when refrigerant from the evaporator is flowing through the turbine. - Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the scope of the invention, which is defined by the claims.
Claims (15)
- An organic rankine cycle (ORC) system (10) having an evaporator (16), a turbine (18), a condenser (12) and a pump (14), and configured to circulate a refrigerant (22) through the ORC system, and having an oil-removal system for preventing failures in the ORC system, characterized in that the oil-removal system comprises:an eductor line (32) located upstream of the turbine and configured to receive a portion of the refrigerant exiting the evaporator; andan eductor system (20) configured to receive the refrigerant from the eductor line and extract liquid out of the turbine.
- The ORC system of claim 1 wherein the eductor system (20) comprises:a first eductor (62) configured to receive the refrigerant from the eductor line and extract liquid out of a discharge housing (42) of the turbine.
- The ORC system of claim 2 wherein the eductor system (20) comprises:a second eductor (64) configured to receive the refrigerant from the eductor line and extract liquid out of a high pressure volute (44) of the turbine.
- The ORC system of claim 1, 2 or 3 further comprising:an oil sump (56) configured to receive the liquid extracted from the eductor system.
- The ORC system of claim 1, 2, 3 or 4 wherein the refrigerant exiting the evaporator is a vapor.
- The ORC system of any preceding claim wherein the liquid extracted from the turbine includes oil, refrigerant, and combinations thereof.
- The ORC system of any preceding claim wherein the eductor line (32) comprises a filter (60) configured to remove particulates from the refrigerant.
- The ORC system of any preceding claim comprising:said condenser (12) configured to condense a vaporized refrigerant;said pump (14) configured to increase a pressure of the condensed refrigerant;said evaporator (16) configured to receive the condensed refrigerant and vaporize the refrigerant;said turbine (18) configured to receive the vaporized refrigerant and generate power, wherein the turbine includes an impeller (40), a discharge housing (42), a high pressure volute (44), and an oil sump (56);an inlet valve (26) configured to control a delivery of refrigerant from the evaporator to the turbine; anda bypass valve (36) configured to prevent the refrigerant from flowing through the turbine during a startup of the turbine, and divert the refrigerant to the condenser;said eductor line (32) being located upstream of the inlet valve and configured to receive a portion of the refrigerant from the evaporator.
- The ORC system of claim 8 wherein the inlet valve (26) is in a closed position when the bypass valve (36) is in an open position.
- A method of operating an organic rankine cycle (ORC) system having an evaporator, a turbine, and a refrigerant configured to circulate through the evaporator and the turbine, the method comprising:preventing the refrigerant exiting the evaporator from passing through the turbine during a startup of the turbine;delivering the refrigerant from the evaporator to a bypass line configured to deliver the refrigerant to the condenser during a startup of the turbine;delivering a portion of the refrigerant from the evaporator to an eductor system during a startup of the engine; andextracting liquid out of the turbine using the eductor system.
- The method of claim 10 wherein delivering a portion of the refrigerant from the evaporator to the eductor system includes:delivering a first portion of the refrigerant to a first eductor, wherein the first eductor is configured to extract liquid from a discharge housing of the turbine; anddelivering a second portion of the refrigerant to a second eductor, wherein the second eductor is configured to extract liquid from a high pressure volute of the turbine.
- The method of claim 10 or 11 wherein delivering a portion of the refrigerant from the evaporator to an eductor system is performed by an eductor line located upstream of the turbine.
- The method of claim 10, 11 or 12 wherein the portion of the refrigerant delivered to the eductor system is less than one percent of a total weight of refrigerant from the evaporator.
- The method of claim 10, 11, 12 or 13 further comprising:delivering the liquid extracted out of the turbine to an oil sump of the turbine.
- The method of any of claims 10 to 14 wherein the liquid extracted from the turbine includes at least one of oil, refrigerant, and combinations thereof.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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SI200731871A SI2179145T1 (en) | 2007-07-27 | 2007-07-27 | Oil removal from a turbine of an organic rankine cycle (orc) system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/US2007/016892 WO2009017471A1 (en) | 2007-07-27 | 2007-07-27 | Oil removal from a turbine of an organic rankine cycle (orc) system |
Publications (3)
Publication Number | Publication Date |
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EP2179145A1 EP2179145A1 (en) | 2010-04-28 |
EP2179145A4 EP2179145A4 (en) | 2014-04-09 |
EP2179145B1 true EP2179145B1 (en) | 2016-11-09 |
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EP07810848.7A Active EP2179145B1 (en) | 2007-07-27 | 2007-07-27 | Oil removal from a turbine of an organic rankine cycle (orc) system |
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US (1) | US20110005237A1 (en) |
EP (1) | EP2179145B1 (en) |
JP (1) | JP4913904B2 (en) |
CN (1) | CN101765704A (en) |
AU (1) | AU2007357132A1 (en) |
CA (1) | CA2694678C (en) |
DK (1) | DK2179145T3 (en) |
MX (1) | MX2010001077A (en) |
SI (1) | SI2179145T1 (en) |
WO (1) | WO2009017471A1 (en) |
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---|---|---|---|---|
ES2467943T3 (en) * | 2008-01-03 | 2014-06-13 | Walter Loidl | Thermal motor |
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-
2007
- 2007-07-27 CN CN200780100057A patent/CN101765704A/en active Pending
- 2007-07-27 EP EP07810848.7A patent/EP2179145B1/en active Active
- 2007-07-27 JP JP2010518153A patent/JP4913904B2/en active Active
- 2007-07-27 CA CA2694678A patent/CA2694678C/en active Active
- 2007-07-27 DK DK07810848.7T patent/DK2179145T3/en active
- 2007-07-27 US US12/670,757 patent/US20110005237A1/en not_active Abandoned
- 2007-07-27 SI SI200731871A patent/SI2179145T1/en unknown
- 2007-07-27 MX MX2010001077A patent/MX2010001077A/en not_active Application Discontinuation
- 2007-07-27 WO PCT/US2007/016892 patent/WO2009017471A1/en active Application Filing
- 2007-07-27 AU AU2007357132A patent/AU2007357132A1/en not_active Abandoned
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SI2179145T1 (en) | 2017-02-28 |
JP2010534785A (en) | 2010-11-11 |
AU2007357132A1 (en) | 2009-02-05 |
DK2179145T3 (en) | 2017-01-09 |
CN101765704A (en) | 2010-06-30 |
EP2179145A4 (en) | 2014-04-09 |
WO2009017471A1 (en) | 2009-02-05 |
CA2694678C (en) | 2014-09-16 |
EP2179145A1 (en) | 2010-04-28 |
JP4913904B2 (en) | 2012-04-11 |
US20110005237A1 (en) | 2011-01-13 |
CA2694678A1 (en) | 2009-02-05 |
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