EP2142803A1 - Screw-rotor machine, energy-conversion system and method for energy conversion - Google Patents
Screw-rotor machine, energy-conversion system and method for energy conversionInfo
- Publication number
- EP2142803A1 EP2142803A1 EP08724313A EP08724313A EP2142803A1 EP 2142803 A1 EP2142803 A1 EP 2142803A1 EP 08724313 A EP08724313 A EP 08724313A EP 08724313 A EP08724313 A EP 08724313A EP 2142803 A1 EP2142803 A1 EP 2142803A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- expander
- screw
- oil
- conduit
- working medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 230000008569 process Effects 0.000 description 11
- 238000005461 lubrication Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- -1 i.e. Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/04—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/021—Control systems for the circulation of the lubricant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/025—Lubrication; Lubricant separation using a lubricant pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/50—Bearings
Definitions
- the present invention relates, in a first aspect, to a screw-rotor machine, preferably an expander, which machine comprises two screw rotors and a housing having an inlet opening and an outlet opening, which housing forms a working space in which the screw rotors are rotatably arranged in engagement with each other, at least one of the rotors being provided with at least one axle journal mounted in bearings, which bearing is oil lubricated and arranged in a bearing chamber, which bearing chamber communicates with the working space via a gap seal.
- the invention in a second aspect, relates to an energy-conversion system comprising an expander, a condenser, a pump and an evaporator arranged in a closed conduit circuit, and a machine driven by the expander.
- the invention in a third aspect, relates to a method for energy conversion, in which a working medium is brought to pass through a closed conduit circuit comprising an expander, a condenser, a pump and an evaporator arranged in series, the expander driving a machine.
- the invention is intended to be applied in a so-called ORC process
- An oil-injected screw expander has excellent efficiency, but has some disadvantages.
- the object of the present invention is to enable energy conversion by means of an ORC process at relatively low power levels with improved performance, increased reliability and with elimination of the disadvantages associated with hitherto known technique within the field.
- a screw-rotor machine of the kind mentioned by way of introduction has the special features that the bearing chamber, in addition to communicating with the working space, also communicates with an oil supply conduit and a drainage conduit, which drainage conduit is connected with a pressure that is lower than the lowest pressure in the working space of the machine when it is open to the outlet.
- an oil separator is arranged in the drainage conduit for separation of oil from medium flowing through the drainage conduit.
- the oil separator is connected to the oil supply conduit via an oil pump.
- the oil separator is connected to an evacuation pump via a conduit for working medium.
- the oil separator is, via a connection conduit for working medium, connected to a conduit connected with the outlet opening of the screw-rotor expander.
- An additional advantage is that the working medium flowing through the bearing chamber is brought back to the main flow of the working medium. This is particularly valuable when the expander is included in an ORC process, since then it is important to avoid discharge to the surroundings of working medium. The need of supplying additional working medium is also eliminated.
- the drainage conduit from the bearing chamber is connected to the circuit of the system between the expander and the pump. Then, the connection is most suitably made between the expander and the condenser.
- the object set forth is attained by a method of the kind mentioned by way of introduction comprising the special measures of using, as an expander, a screw-rotor expander having at least two screw rotors, at least one rotor of which is mounted in at least one oil-lubricated bearing, bringing working medium to leak out to said bearing, and leading away mixture of oil and working medium from the bearing.
- oil is sepa- rated from said mixture.
- the working medium is a compound based on carbon, fluorine or nitrogen.
- the advantages of the invented method are util- ized in a context where said advantages are particularly significant.
- the working medium having passed the oil separator is supplied to the conduit circuit between the expander and the pump.
- Figure 1 is a diagram illustrating an energy-conversion system according to the invention.
- Figure 2 is a longitudinal section through a screw expander according to the invention.
- FIG. 1 an energy-conversion system according to the invention is illustrated.
- the system applies an ORC process with a suitable working medium, such as, e.g., RI34a, ammonia, some hydrocarbon compound or carbon dioxide.
- Working medium is supplied at a first pressure via the conduit 5 to the inlet of a screw expander 1, in which the working medium expands to a lower pressure, and exits the expander 1 through the outlet conduit 6.
- the outlet conduit 6 directs the low-pressure working medium to a condenser 2 so that the working medium exits the same in the liquid phase through the conduit 7.
- a pump 3 By means of a pump 3, the pressure of the liquid working medium is raised and is fed through conduit 8 to an evaporator 4, where the working medium is evaporated and is fed back to the inlet conduit 5 of the expander 1 at said first pressure.
- the expander drives a machine 9, which either may be a generator or a machine that directly utilizes the mechanical energy.
- the working medium flows through a closed circuit and experiences phase changes by dissipation and supply, respectively, of heat.
- the system may be used for generation of cold, heat refinement, energy conversion of heat into mechanical energy and/or generation of electricity.
- the system is well adapted to utilize low-grade heat, such as, e.g., from solar energy and incineration.
- Supplied heat is typically at a temperature lower than 140 °C, and with suitable choice of working medium, sources of heat having a temperature down to 30-40 °C may be utilized.
- the expander 1 is described in more detail, reference being made to Fig. 2 where the same is formed in a special way in accordance with the invention.
- the expander 1 comprises two screw rotors 102, only one of which is made visible in the figure.
- One of the rotors is of the male rotor type and the other of the female rotor type, and are surrounded by a housing 101 that delimits a working space 115 having the shape of two cylinders intersecting each other. Between the rotors 102 and the housing 101, V-shaped working chambers are formed, which, when the rotors rotate, drift from the inlet 114 of the expander toward the outlet 113 thereof.
- the functional mode in detail of a screw-rotor expander should be generally known and requires therefore, in this connection, not any further detailed description.
- the screw rotor 102 visible in the figure has an output shaft 103 connected with the driven unit 9 illustrated in Fig. 1. At the other end thereof, the screw rotor is formed with an axle journal 104 mounted in a bearing 106. This is arranged in a bearing chamber 105. The bearing chamber communicates with the working space of the expander 1 via narrow gap 107.
- An oil circuit having a supply conduit 111, a drainage conduit 108, an oil separator 109, and an oil pump 110 are connected to the bearing chamber 105.
- the oil separator is, via a conduit 112 for working medium, connected with the outlet conduit 6 of the expander 1.
- gaseous working medium of relatively high pressure is supplied to the inlet opening 114 of the expander, is expanded in the expander 1 , and exits the same through the outlet 113 of the expander at a lower pressure out through the outlet conduit 6.
- Oil is supplied to the bearing chamber by means of the oil pump 110 through the supply conduit 111.
- the oil is then drained from the bearing chamber 105 via the drainage conduit 108 and the oil separator 109 so as to be recircu- lated.
- the pressure conditions are such that the pressure in the bearing chamber is lower than the part of the working space of the expander that is exposed to the gap 107 between the end portion 116 of the expander and the bearing chamber 105. Thereby, there is no risk that oil from the lubrication circuit leaks out from the bearing chamber 105 via the gap 107 into the working space 115 of the expander. Instead, there is a leakage flow of working medium from the working space 115 of the expander via the gap 107 into the bearing chamber 105, where the working medium is intermixed in the oil.
- the oil separator needs to be dimensioned only for the separation of the relatively limited amount of working medium that leaks out through the gap 107 and the limited amount of oil that circulates in the lubrication circuit for the bearing. This will be of a completely different size than in an oil-injected expander, where it is a matter of a much greater amount of oil and where all working medium is mixed with the oil.
- a corresponding bearing chamber may be arranged also at the output shaft 103 of the expander, as well as at the axle journals of the other rotor.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0700819A SE531038C2 (en) | 2007-04-02 | 2007-04-02 | Screw rotor machine, energy conversion system and method of energy conversion |
PCT/SE2008/050367 WO2008121070A1 (en) | 2007-04-02 | 2008-03-31 | Screw-rotor machine, energy-conversion system and method for energy conversion |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2142803A1 true EP2142803A1 (en) | 2010-01-13 |
EP2142803A4 EP2142803A4 (en) | 2014-07-09 |
EP2142803B1 EP2142803B1 (en) | 2018-07-04 |
Family
ID=39808545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08724313.5A Active EP2142803B1 (en) | 2007-04-02 | 2008-03-31 | Screw-rotor machine, energy-conversion system and method for energy conversion |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2142803B1 (en) |
AU (1) | AU2008233326B2 (en) |
RU (1) | RU2453731C2 (en) |
SE (1) | SE531038C2 (en) |
WO (1) | WO2008121070A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITVI20120227A1 (en) * | 2012-09-11 | 2012-12-11 | Virgilio Mietto | DISOLVEMENT DEVICE FOR A VOLUMETRIC COMPRESSOR AND VOLUMETRIC COMPRESSOR. |
DE102013200413A1 (en) * | 2013-01-14 | 2014-07-31 | Magna Powertrain Ag & Co. Kg | Expander cycle |
US20160040557A1 (en) | 2013-03-13 | 2016-02-11 | Echogen Power Systems, L.L.C. | Charging pump system for supplying a working fluid to bearings in a supercritical working fluid circuit |
FR3003897A1 (en) * | 2013-03-29 | 2014-10-03 | Jean Thiessard | CRYOGENIC THERMAL MACHINE |
JP5860435B2 (en) * | 2013-05-31 | 2016-02-16 | 株式会社神戸製鋼所 | Power generator |
DE102014014032A1 (en) | 2014-09-26 | 2016-03-31 | Martin Maul | Device for power generation, in particular ORC system |
DE102016204405A1 (en) | 2016-03-17 | 2017-09-21 | Martin Maul | Device for power generation, in particular ORC system |
CN106211591A (en) * | 2016-08-31 | 2016-12-07 | 竞陆电子(昆山)有限公司 | Water absorber for pcb board finished product cleaning product line |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3178104A (en) * | 1962-08-20 | 1965-04-13 | Gardner Denver Co | Bearing lubrication system for compressor apparatus |
WO1999013224A1 (en) * | 1997-08-25 | 1999-03-18 | Svenska Rotor Maskiner Ab | Oil-free screw rotor apparatus |
WO2000042322A1 (en) * | 1999-01-11 | 2000-07-20 | E.I. Du Pont De Nemours And Company | Screw compressor |
WO2006131759A2 (en) * | 2005-06-10 | 2006-12-14 | City University | Expander lubrication in vapour power systems |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB242702A (en) * | 1924-08-11 | 1925-11-11 | Sebastian Ziani De Ferranti | Improvements in and relating to induction electricity meters |
SE422349B (en) * | 1977-11-28 | 1982-03-01 | Stal Refrigeration Ab | OIL SEPARATION AT A PLANT TO COMPRESS A GAS |
SU1765522A1 (en) * | 1990-05-21 | 1992-09-30 | Научно-исследовательский и конструкторский институт центробежных и роторных компрессоров | Screw oil-filled compressor unit |
US5727926A (en) * | 1992-11-25 | 1998-03-17 | Kawasaki Jukogyo Kabushiki Kaisha | Pitch link for rotary wing aircraft and automatic adjuster thereof |
RU2076246C1 (en) * | 1994-02-18 | 1997-03-27 | Товарищество с ограниченной ответственностью "ЭКМОТО" | Air-steam-driven-machine |
SE503871C2 (en) * | 1994-06-21 | 1996-09-23 | Svenska Rotor Maskiner Ab | Rotary displacement compressor with liquid circulation system |
JP2003161114A (en) * | 2001-11-28 | 2003-06-06 | Sanyo Electric Co Ltd | Rankine cycle |
GB0511864D0 (en) * | 2005-06-10 | 2005-07-20 | Univ City | Expander lubrication in vapour power systems |
-
2007
- 2007-04-02 SE SE0700819A patent/SE531038C2/en unknown
-
2008
- 2008-03-31 AU AU2008233326A patent/AU2008233326B2/en not_active Ceased
- 2008-03-31 EP EP08724313.5A patent/EP2142803B1/en active Active
- 2008-03-31 RU RU2009140309/06A patent/RU2453731C2/en active
- 2008-03-31 WO PCT/SE2008/050367 patent/WO2008121070A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3178104A (en) * | 1962-08-20 | 1965-04-13 | Gardner Denver Co | Bearing lubrication system for compressor apparatus |
WO1999013224A1 (en) * | 1997-08-25 | 1999-03-18 | Svenska Rotor Maskiner Ab | Oil-free screw rotor apparatus |
WO2000042322A1 (en) * | 1999-01-11 | 2000-07-20 | E.I. Du Pont De Nemours And Company | Screw compressor |
WO2006131759A2 (en) * | 2005-06-10 | 2006-12-14 | City University | Expander lubrication in vapour power systems |
Non-Patent Citations (1)
Title |
---|
See also references of WO2008121070A1 * |
Also Published As
Publication number | Publication date |
---|---|
RU2009140309A (en) | 2011-05-10 |
SE531038C2 (en) | 2008-11-25 |
AU2008233326A1 (en) | 2008-10-09 |
WO2008121070A1 (en) | 2008-10-09 |
RU2453731C2 (en) | 2012-06-20 |
EP2142803A4 (en) | 2014-07-09 |
EP2142803B1 (en) | 2018-07-04 |
SE0700819L (en) | 2008-10-03 |
AU2008233326B2 (en) | 2012-03-08 |
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