US20120317982A1 - Vapour power plant with hermetic turbogenerator - Google Patents

Vapour power plant with hermetic turbogenerator Download PDF

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Publication number
US20120317982A1
US20120317982A1 US13/528,458 US201213528458A US2012317982A1 US 20120317982 A1 US20120317982 A1 US 20120317982A1 US 201213528458 A US201213528458 A US 201213528458A US 2012317982 A1 US2012317982 A1 US 2012317982A1
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US
United States
Prior art keywords
working fluid
slide bearings
vapour
cycle
turbogenerator
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.)
Abandoned
Application number
US13/528,458
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English (en)
Inventor
Wojciech Klonowicz
Pawel Hanausek
Aleksandra Borsukiewicz-Gozdur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TURBOSERVICE SPOLKA Z O O
Original Assignee
TURBOSERVICE SPOLKA Z O O
Priority date (The priority date 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 date listed.)
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Publication date
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Assigned to TURBOSERVICE, SPOLKA Z O. O. reassignment TURBOSERVICE, SPOLKA Z O. O. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BORSUKIEWICZ-GOZDUR,ALEKSANDRA, HANAUSEK,PAWEL, Klonowicz, Wojciech
Publication of US20120317982A1 publication Critical patent/US20120317982A1/en
Abandoned legal-status Critical Current

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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

Definitions

  • the invention relates to the vapor power plant with hermetic turbogenerator.
  • the vapor power plant is based on the Organic Rankine Cycle (ORC), i.e. on the thermal power plant cycle that works with low boiling point fluids instead of water.
  • ORC Organic Rankine Cycle
  • hermetic turbogenerator to work in vapor power plants that are based on the thermal power plant cycle with low boiling point fluids is disclosed in the Polish Patent Application P 390472.
  • This hermetic turbogenerator consists of an electric generator and of a vapour turbine that are both placed in the hermetic casing of the turbogenerator.
  • the electric generator is cooled with the working fluid vapour that has been expanded in the vapour turbine.
  • the inlet of the high pressure vapour of the working fluid is arranged in the hermetic casing in front of the vapour turbine, and the outlet of the expanded vapour is positioned in the hermetic casing behind the electric generator.
  • a system of power generation known from the description of the invention GB1083239 is based on thiophenc as the cycle working fluid that is heated and evaporated in a vapour generator, expanded in a turbine, cooled and condensed in a condenser and supplied back to the vapour generator.
  • thiophene is used to lubricate the turbine bearings.
  • the invention does not relate to the hermetic generator and does not incorporate any piping system attached to the turbine bearings to return the lubricating fluid as its liquid phase.
  • a portable micro power plant operating with mercury vapour as the working fluid is known from the invention U.S. Pat. No. 2,961,550.
  • the system incorporates a hermetic turbogenerator and its internal bearings are lubricated by the working fluid liquid that is, under low pressure, supplied from the condenser.
  • the invention does not relate to the turbogenerator in which the electric generator is cooled with the working fluid vapour, and can not be applied to the cases where low boiling point fluids are used as the cycle working fluids.
  • a power plant known from the invention US 20110047958 contains a vapour turbine with an electric generator, an evaporator, a condenser, a cycle pump, and is working with HFE as the cycle working fluid that is mixed with fluoric oil acting as lubricant for the bearings.
  • a fraction of the working fluid with a high content of the lubricant is extracted from the evaporator and is used to lubricate the rolling bearings.
  • a method to secure the lubrication of the high speed turbogenerator bearings is known from the international publication WO 9205342. In this method, for the case of the cycle working fluid pump emergency stoppage, the ORC turbogenerator rotor slide bearings are lubricated with the cycle working fluid supplied from the lower part of the evaporator upon the principle that the evaporator pressure would then increase.
  • the solution does not apply to the hermetic turbogenerator in which the electric generator is cooled with the working fluid vapour, and it does not properly regard the thermal process inertia that excludes the rotor bearings emergency supply.
  • a vapour power plant with the hermetic turbogenerator is known from the Polish Patent Application P 390472.
  • the electric generator placed together with the vapour turbine inside a hermetic casing is cooled with the expanded working fluid vapour.
  • the inlet of the high pressure vapour is located in the hermetic casing upstream to the turbine inlet.
  • the outlet of the expanded vapour is located in the hermetic casing downstream to the electric generator position.
  • the expanded vapour of the working fluid flows around the electric generator and carries away heat emitted by the generator.
  • the goal of the present invention is, for the standard ORC power plant of moderate power output, to provide a solution that (1) enables an effective lubrication of the slide bearings enclosed in the hermetic turbogenerator that is cooled with the working fluid vapour of the power plant cycle, that (2) provides effective protection of the turbogenerator bearings lubrication in case of the power plant cycle emergency stoppage, that (3) works without lubricants other than the cycle working fluid and that (4) works without the effect of lowering the power plant efficiency.
  • FIG. 1 is a schematic diagram showing main components of a vapour power plant.
  • the ORC power plant contains the main thermal cycle of the working fluid, whereby that cycle works with the low boiling point working fluid and extends from the preheater and evaporator through the vapour turbine, the latter being placed together with the electric generator in a common hermetic casing to form the hermetic turbogenerator, next through the condenser, the working fluid buffer container, the main cycle pump and back to the preheater.
  • the electric generator is cooled by the expanded vapour of the working fluid, whereby the high pressure vapour inlet is located in the common hermetic casing upstream to the turbine and the expanded vapour outlet of the common hermetic casing is located downstream to the electric generator position.
  • the ORC power plant described above contains an additional, internal cycle of the working fluid that serves for the slide bearing lubrication and that consists of the slide bearings supplying piping, the latter being attached to the main working fluid cycle downstream to the main cycle pump, of the slide bearings housing and of the return piping which directs the main portion of the working fluid liquid from the slide bearings to the working fluid buffer container and back to the main cycle pump.
  • the remaining portion of the working fluid liquid that, in the slide bearings labyrinth seals, expands to the vapour phase is directed from the hermetic casing to the condenser, jointly with the working fluid vapour having been expanded in the turbine.
  • An additional, emergency supplying piping that incorporates an emergency working fluid pump then connects the working fluid buffer container and the slide bearing supplying piping.
  • the emergency pump is activated in case of cycle pump failure during the power plant operation.
  • Both the slide bearing supplying piping and emergency supplying piping include non-return valves directly prior to piping connection point.
  • the advantage of the present invention lies in continuous, long lasting lubrication of the turbogenerator slide bearings, in contrast to the relevant situation with the known hermetic turbogenerator. This advantage effectively reduces maintenance requirements in cases where the ORC power plant with hermetic turbogenerator is used in real industrial conditions.
  • the relevant ORC power plant solution enables the working fluid liquid as lubricant to be supplied to the slide bearings at much higher pressure than that of the slide bearings exterior.
  • the homogeneity and cleanliness of the working fluid are the advantage of the solution with the working fluid as lubricant for the hermetic turbogenerator slide bearings, when no other lubricant is needed.
  • the main working fluid cycle of the ORC power plant converts low temperature heat into mechanical energy that is then transformed into electrical energy.
  • a special working fluid mostly of organic nature, circulates in that cycle.
  • the working fluid liquid that flows through the preheater 6 and next through the evaporator 5 extracts heat from the supplying energy carrier 9 .
  • the working fluid being then in form of the hot working fluid vapor is directed to the turbine 2 that, due to the working fluid vapor expansion, generates mechanical power.
  • the turbine 2 drives the electric generator 3 by means of the common shaft connecting the turbine and generator rotors. Both the turbine 2 and electric generator 3 are placed in the common turbogenerator casing 1 .
  • the electric generator 3 is cooled with the expanded working fluid vapour coming from the turbine outlet.
  • the expanded working fluid vapour leaves the turbogenerator casing 1 and is directed, via the piping 13 , to the condenser 7 where it is cooled and condensed to liquid phase with help of the cooling fluid 11 .
  • the resulting working fluid liquid flows from the condenser 7 through the buffer container 14 to the main cycle pump 8 that raises the working fluid pressure.
  • the pressurized working fluid liquid is then directed to the preheater 6 and the whole working fluid circulation is repeated.
  • the main working fluid cycle is supplemented by an additional, internal working fluid cycle that serves for lubrication of the turbogenerator slide bearings.
  • the slide bearings supply piping 12 is connected to the outlet of the main cycle pump 8 and is used to supply the pressurized working fluid liquid to the slide bearings housing 4 .
  • the pressurized working fluid liquid lubricates the turbogenerator slide bearings and, at the same time, its pressure drops. Then, the main portion of the working fluid liquid is from the slide bearings housing returned to the buffer container 14 by using the return piping 10 .
  • the slide bearings supply piping 12 is additionally connected with the working fluid buffer container 14 via the emergency supply piping 18 that incorporates the emergency supply pump 15 .
  • Both the slide bearings supply piping 12 and the emergency supply piping 18 upstream to their connection point, are equipped with non-return valves, 16 and 17 respectively.
  • the power plant control system decouples the electric generator from the electric network and activates the emergency supply pump 15 to allow for a safe stoppage of rotating elements of the turbogenerator.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Motor Or Generator Cooling System (AREA)
US13/528,458 2011-06-20 2012-06-20 Vapour power plant with hermetic turbogenerator Abandoned US20120317982A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PLP.395363 2011-06-20
PL395363A PL217172B1 (pl) 2011-06-20 2011-06-20 Elektrownia parowa z hermetycznym turbogeneratorem parowym

Publications (1)

Publication Number Publication Date
US20120317982A1 true US20120317982A1 (en) 2012-12-20

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US13/528,458 Abandoned US20120317982A1 (en) 2011-06-20 2012-06-20 Vapour power plant with hermetic turbogenerator

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US (1) US20120317982A1 (pl)
EP (1) EP2538041A2 (pl)
PL (1) PL217172B1 (pl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130160450A1 (en) * 2011-12-22 2013-06-27 Frederick J. Cogswell Hemetic motor cooling for high temperature organic rankine cycle system
US20170002695A1 (en) * 2014-03-24 2017-01-05 Yu Bee KIM Organic rankine binary cycle power generation system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10690014B2 (en) * 2017-05-12 2020-06-23 DOOSAN Heavy Industries Construction Co., LTD Cooling module, supercritical fluid power generation system including the same, and supercritical fluid supply method using the same
SE2051385A1 (en) * 2020-11-27 2022-05-28 Climeon Ab Turbine and turbine-generator assembly with magnetic coupling

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044561A (en) * 1974-08-06 1977-08-30 Bbc Brown Boveri & Company Limited Steam turbine having bearing structures lubricated with steam condensate in recirculating system
US4191021A (en) * 1976-08-11 1980-03-04 Hitachi, Ltd. Small power plant utilizing waste heat
US4363216A (en) * 1980-10-23 1982-12-14 Lucien Bronicki Lubricating system for organic fluid power plant
PL390472A1 (pl) * 2010-02-17 2010-07-19 Turboservice Spółka Z Ograniczoną Odpowiedzialnościąturboservice Spółka Z Ograniczoną Odpowiedzialnością Hermetyczny turbogenerator parowy, elektrownia parowa z hermetycznym turbogeneratorem parowym oraz sposób chłodzenia hermetycznego turbogeneratora parowego
US20100281865A1 (en) * 2009-05-06 2010-11-11 General Electric Company Organic rankine cycle system and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044561A (en) * 1974-08-06 1977-08-30 Bbc Brown Boveri & Company Limited Steam turbine having bearing structures lubricated with steam condensate in recirculating system
US4191021A (en) * 1976-08-11 1980-03-04 Hitachi, Ltd. Small power plant utilizing waste heat
US4363216A (en) * 1980-10-23 1982-12-14 Lucien Bronicki Lubricating system for organic fluid power plant
US20100281865A1 (en) * 2009-05-06 2010-11-11 General Electric Company Organic rankine cycle system and method
PL390472A1 (pl) * 2010-02-17 2010-07-19 Turboservice Spółka Z Ograniczoną Odpowiedzialnościąturboservice Spółka Z Ograniczoną Odpowiedzialnością Hermetyczny turbogenerator parowy, elektrownia parowa z hermetycznym turbogeneratorem parowym oraz sposób chłodzenia hermetycznego turbogeneratora parowego

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Feedwater Heater". Wikipedia. https://web.archive.org/web/20080105164655/http://en.wikipedia.org/wiki/Feedwater_heater. January 5, 2008. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130160450A1 (en) * 2011-12-22 2013-06-27 Frederick J. Cogswell Hemetic motor cooling for high temperature organic rankine cycle system
US9689281B2 (en) * 2011-12-22 2017-06-27 Nanjing Tica Air-Conditioning Co., Ltd. Hermetic motor cooling for high temperature organic Rankine cycle system
US20170002695A1 (en) * 2014-03-24 2017-01-05 Yu Bee KIM Organic rankine binary cycle power generation system

Also Published As

Publication number Publication date
PL217172B1 (pl) 2014-06-30
PL395363A1 (pl) 2013-01-07
EP2538041A2 (en) 2012-12-26

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Owner name: TURBOSERVICE, SPOLKA Z O. O., POLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KLONOWICZ, WOJCIECH;HANAUSEK,PAWEL;BORSUKIEWICZ-GOZDUR,ALEKSANDRA;REEL/FRAME:028508/0861

Effective date: 20120615

STCB Information on status: application discontinuation

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