EP2589747B1 - Turbine à vapeur et procédé de réglage de la poussée d'une turbine à vapeur - Google Patents

Turbine à vapeur et procédé de réglage de la poussée d'une turbine à vapeur Download PDF

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Publication number
EP2589747B1
EP2589747B1 EP11800520.6A EP11800520A EP2589747B1 EP 2589747 B1 EP2589747 B1 EP 2589747B1 EP 11800520 A EP11800520 A EP 11800520A EP 2589747 B1 EP2589747 B1 EP 2589747B1
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EP
European Patent Office
Prior art keywords
steam
dummy member
valve
pressure
steam turbine
Prior art date
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EP11800520.6A
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German (de)
English (en)
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EP2589747A1 (fr
EP2589747A4 (fr
Inventor
Takashi Maruyama
Asaharu Matsuo
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Mitsubishi Power Ltd
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Mitsubishi Hitachi Power Systems Ltd
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Publication of EP2589747A1 publication Critical patent/EP2589747A1/fr
Publication of EP2589747A4 publication Critical patent/EP2589747A4/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D3/00—Machines or engines with axial-thrust balancing effected by working-fluid
    • F01D3/04—Machines or engines with axial-thrust balancing effected by working-fluid axial thrust being compensated by thrust-balancing dummy piston or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings

Definitions

  • the present invention relates to a steam turbine and a method of adjusting a thrust force of the steam turbine, particularly regarding a steam turbine and a method of adjusting a thrust force of the steam turbine which are capable of balancing of a thrust force acting on a rotor shaft of the steam turbine which includes at least a high-pressure (HP) blade cascade, an intermediate-pressure (IP) blade cascade and a plurality of dummy members that are attached to a common rotor shaft.
  • HP high-pressure
  • IP intermediate-pressure
  • the steam turbine Since the rotor shaft is subjected to the thrust force acting thereon, the steam turbine is provided with a thrust bearing. With a limited load capacity of the bearing, it is necessary to design the steam turbine in consideration of a thrust balance so that the thrust force acting on the rotor shaft does not exceed the load capacity of the bearing under any operating condition.
  • the dummy members (dummy pistons) and the blade cascades are attached to the same rotor shaft, so as thrust forces in a counter-thrust direction are generated by the dummy members to balance the forces acting in an axial direction of the entire rotor shaft.
  • the thrust force acting on the rotor shaft is kept within the scope of the load capacity of the bearing under any operation condition.
  • FIG.13 shows an outline view regarding a conventional steam turbine under a normal operating condition, the conventional steam turbine being provided with dummy members for adjusting the thrust forces.
  • a turbine casing (not shown) is formed around a rotor shaft 10.
  • the turbine casing includes an inlet part (not shown) for introducing high-pressure (HP) main steam 22, an inlet part (not shown) for introducing reheat steam 24 and an inlet part (not shown) for introducing low-pressure (LP) main steam 26.
  • HP high-pressure
  • LP low-pressure
  • a HP blade cascade 2 to which the HP main steam is supplied, an IP blade cascade 4 to which the reheat steam 24 is supplied and a low-pressure (LP) blade cascade 6 to which the LP main steam 26 is supplied are attached to the rotor shaft 10 in this order.
  • the IP blade cascade 4 and the LP blade cascade 6 have steam inlets that are open to one side, whereas the HP blade cascade 2 has a steam inlet is open to other side being opposite to the one side.
  • a high-pressure (HP) dummy member 12 is provided between the steam inlet of the HP blade cascade 2 and the steam inlet of the IP blade cascade 4.
  • an intermediate-pressure (IP) dummy member 14 and a low-pressure (LP) dummy member 16 are provided in this order. Further, a thrust balance conduit 30 is provided so as to communicate the outlet side of the IP dummy member 14 to a latter half of the IP blade cascade 4.
  • the HP main steam 22 from a boiler and the like enters the HP blade cascade 2. And, the HP main steam 22 gives a rotary force to the rotor shaft 10 while the steam passes through the HP blade cascade 2.
  • the steam that has done the work through the HP blade cascade 2 drops the pressure and the temperature gradually and is discharged out of the steam turbine 1 as a low-temperature reheat steam 28.
  • the low-temperature reheat steam 28 discharged out of the steam turbine 1 is reheated by a reheat boiler (not shown) to be the reheat steam 24.
  • the IP reheat steam 24 that is reheated by the reheat boiler gives the rotary force to the rotor shaft 10 and gradually reduces the pressure and the temperature while the reheat steam 24 passes through the IP blade cascade 4.
  • the LP main steam 26 gives the rotary force to the rotor shaft 10 and gradually reduces the pressure and the temperature while the LP main steam 26 passes through the LP blade cascade 6.
  • a part of the high-pressure (HP) main steam 22 passes by the high-pressure (HP) dummy member 12 and a part of the low-temperature reheat steam 28 that has passed through the HP blade cascade and has reduced the temperature and the pressure, passes by the intermediate- pressure (IP) dummy member 14 and the low-pressure (LP) dummy member 16.
  • HP high-pressure
  • IP intermediate- pressure
  • LP low-pressure
  • the thrust forces acting on the rotor shaft 10 at the cascades and the dummy members on the rotor shaft are represented by encircled numbers, 1 to 6 and an example regarding a set of the pressure values between adjacent pair of each blade cascade (dummy parts) are shown in FIG. 13 .
  • the thrust forces indicated by encircled numbers 1,2,3,4,5 and 6 denote the thrust forces acting on the LP dummy member 16, the IP dummy member 14, the HP blade cascade 2, the HP dummy member 12, the IP blade cascade 4 and the LP blade cascade 6, respectively.
  • the thrust force acting on each of the blade cascades can be computed based on the gas pressure force working on each blade cascade and the thrust force acting on each of the dummy members can be computed based on a pressure difference between both sides of each dummy member and a cross-sectional area of each dummy member.
  • the dummy members 12, 14 and 16, and the thrust balance conduit 30 are provided so as to balance the thrust forces by the steam pressure.
  • the thrust force acting on the HP dummy member 12 roughly serves as a counterbalance to the thrust force acting on the HP blade cascade 2
  • the thrust acting on the IP dummy member 14 roughly serving as a counterbalance to the thrust force acting on the IP blade cascade 4
  • the thrust force acting on the LP dummy member 16 roughly serving as a counterbalance to the thrust force acting on the LP blade cascade 6.
  • the resultant thrust force acting on the whole steam turbine 1 is balanced.
  • the resultant thrust force needs to be brought into balance not only in a case where the steam turbine is operated under a normal operating condition but also in a case where either the HP main steam supply or the reheat steam supply is stopped.
  • FIG.14 shows the outline of the state of the steam turbine provided with conventional dummy parts for adjusting thrust balance, when the supply of the HP main steam 22 is stopped.
  • FIG.15 shows the outline of the state of the steam turbine provided with conventional dummy parts for adjusting thrust balance, when the supply of the reheat steam and the LP main steam is stopped.
  • the pressure at the outlet of the IP dummy member 14 becomes a level of vacuum pressure and in response to the vacuum pressure level, the thrust force represented by the encircled numeral 2 as shown in FIG.15 increases.
  • the pressure difference between both sides of the IP blade cascade 4 becomes approximately 0.
  • the thrust force represented by the encircled numeral 5 becomes approximately 0.
  • the resultant thrust force acting toward the direction of the IP dummy member side increases.
  • the thrust force generated in the HP blade cascade 2 represented by the encircled numeral 3 is approximately the same as that of a normal operation condition, whereas the thrust force represented by the encircled numeral 2 generated in the HP dummy member 12 increases by an amount corresponding to the vacuum pressure level at the outlet of the HP dummy member 12.
  • the thrust force acting in the direction of the HP dummy member (rightward in FIG.15 ) increase.
  • the increase of the thrust force generated in the IP system is greater than the increase of the thrust force generated in the HP system. Accordingly, the resultant thrust force generated in the whole steam turbine 1 increases in the leftward direction in FIG.15 . Thus, the resultant thrust force acting on the whole steam turbine is not balanced.
  • the HP dummy member 12 is upsized so that thrust force in the rightward direction increases and the resultant thrust force is balanced.
  • the upsizing of the HP dummy member 12 spoils the balancing in the normal operation and thus, this approach is not appropriate.
  • the IP dummy member 14 is downsized and the LP dummy member 16 is upsized.
  • Patent Reference 1 discloses another technology; according to this technology, thrust forces acting on the steam turbine are evaluated based on the measured data such as bearing temperatures. Based on the results of the measurements, the thrust forces acting on the dummy members can be adjusted in an electronic control approach, and the resultant thrust force developed in the whole steam turbine is brought into balance.
  • Patent Reference 1 where the balancing of the thrust forces is performed by use of an electric control, there is a possibility that the reliability of the electric system may cause a problem.
  • the present invention provides a steam turbine according to claim 1 having at least a high-pressure (HP) blade cascade, an intermediate-pressure (IP) blade cascade and a plurality of dummy members that are attached to a common rotor shaft.
  • the steam turbine includes:
  • the thrust force generated at the IP dummy member when the steam flow into the IP chamber stops can be eliminated.
  • the diameter of the LP dummy member can be reduced and the thrust forces acting on the rotor of the steam turbine can be balanced in the entire operation range of the steam turbine without using the electric control of the complicated system.
  • the above pressure reducing unit includes a first conduit that connects the both sides of the target dummy member and a first valve that is provided in the first conduit to adjust the pressure difference between the both sides of the target dummy member.
  • the above steam turbine may further include:
  • control unit may control the third valve to open so as to generate the pressure difference between the both sides of the target dummy member.
  • the above pressure reducing unit may include, but is not limited to:
  • the second valve may be closed when the steam flow into the IP chamber stops.
  • the second conduit is often provided even in the conventional steam turbines.
  • the pressure reducing unit can be provided by simply fitting the second valve to the existing second conduit without newly installing a conduit to the steam turbine.
  • the remodeling can be easily accomplished.
  • the above steam turbine may further include:
  • the above steam turbine may also include:
  • control unit may control the third valve to open so as to generate the pressure difference between the both sides of the target dummy member.
  • the present invention provides in claim 6 a method of adjusting a thrust force of a steam turbine having at least a HP blade cascade, an IP blade cascade and a plurality of dummy members that are attached to a common rotor shaft.
  • the method may include, but is not limited to, the step of reducing a pressure difference between both sides of a target dummy member of said plurality of the dummy members when the steam flow into the IP chamber stops, the target dummy member having one side communicating with a part of the IP chamber.
  • the pressure difference between the both sides of the target dummy member may be reducible by use of a first valve provided in a first conduit that connects the both sides of the target dummy member.
  • the pressure difference may be generated between the both sides of the target dummy member by opening a third valve which is provided in a third conduit that connects the one side of the target dummy member to an outlet of the IP chamber.
  • the pressure difference between the both sides of the target dummy member may be reducible by use of a second valve provided in a second conduit that connects the part of the IP chamber and the one side of the target dummy member.
  • the pressure difference may be generated between the both sides of the target dummy member by opening a third valve which is provided in a third conduit that connects the one side of the target dummy member to an outlet of the IP chamber.
  • the steam turbine and the method of adjusting the thrust force of the steam turbine can be provided which are operable to balance the thrust forces in the entire operation range of the steam turbine without upsizing the LP dummy member, as well as, without using the electric control of a complicated system.
  • FIG.1 shows a configuration of a single-casing reheat steam turbine provided with a plurality of dummy members for adjusting thrust forces, according to a first preferred embodiment of the present invention.
  • a low-pressure (LP) casing 32 and a HP-IP casing 34 are formed around a rotor shaft 10.
  • the HP-IP casing 34 is provided with a high-pressure (HP) steam inlet 23 through which HP steam 22 is supplied to the steam turbine and a reheat steam inlet 25 through which reheat steam 24 is supplied to the steam turbine.
  • the LP casing 32 is provided with a low-pressure (LP) steam inlet 27 through which LP steam 26 is supplied to the steam turbine.
  • HP blade cascade 2 to which the HP main steam is supplied
  • IP intermediate-pressure
  • LP low-pressure
  • a steam inlet side of the IP blade cascade 4 and the LP blade cascade 6 are arranged such that the steam streams through the IP blade cascade 4 and the LP blade cascade 6 in the same direction, whereas a steam inlet side of the HP blade cascade 2 is arranged such that the steam streams through the HP blade cascade 2 in the opposite direction.
  • a HP dummy member 12 is provided between the steam inlet side of the HP blade cascade 2 and the steam inlet side of the IP blade cascade 4.
  • an IP dummy member 14 and a LP dummy member 16 are provided in this order.
  • a thrust balance conduit 30 is provided to communicate the steam outlet side of the IP dummy member 14 to a part of the IP blade cascade 4.
  • FIG.2 shows an outline of a normal operating state of the steam turbine provided with the dummy members for adjusting thrust forces.
  • a normal operating state means an operating state of the steam turbine in which all of the HP steam 22, the reheat steam 24 and the LP steam 26 are supplied to the steam turbine.
  • the diameter of the IP dummy member 14 is upsized in comparison with the conventional dummy member 14, whereas the diameter of the LP dummy member 16 is downsized in comparison with the conventional dummy member 16.
  • the thrust forces of the steam turbine as a whole are prevented from being unbalanced.
  • a conduit 42 is provided to communicate the steam inlet side of the IP dummy member 14 to the steam outlet side thereof and a valve 43 is provided on the conduit 42.
  • a conduit 44 is connected to the conduit 42 on a side closer to the steam outlet side of the IP dummy part than the valve 43 and in communication to the steam outlet side of the IP blade cascade 4.
  • a valve 45 is provided on the conduit 44.
  • a valve 41 is provided on the thrust balance conduit 30.
  • a control unit 52 is provided.
  • the control unit 52 reads a detected value detected by a pressure sensor 54 which is provided at the reheat steam inlet 25 and controls opening and closing of the valves 41, 43 and 45 based on the detected value.
  • the control unit 52 controls the valve 41 to open and the valves 43 and 45 to close as shown in FIG.2 .
  • the valve mark filled in with black indicates an opened state
  • the valve mark filled in with white indicates a closed state.
  • the unit k denotes a pressure value in kgf/cm 2 to show pressure values as only example values at indicated places.
  • the steam turbine is provided with the dummy members 12, 14 and 16, and the thrust balance conduit 30. In the normal operating state, the resultant thrust force generated by the steam pressures is balanced.
  • FIG.3 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention when the supply of the HP main steam is stopped.
  • the control unit 52 is omitted.
  • FIG.4 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention when the supply of the reheat steam and the LP main steam is stopped.
  • the control unit 52 determines that the reheat steam 24 is not supplied based on the pressure value detected by the pressure sensor 54 (not shown in FIG.4 )
  • the control unit 52 opens the valve 43.
  • the pressure difference between both sides of the IP dummy member 14 becomes approximately 0.
  • an excessive thrust force is generated at the IP dummy member 14 in the leftward direction.
  • the thrust force can be prevented from being generated at the IP dummy member 14.
  • the diameter of the LP dummy member 16 is designed so as to generate a counter thrust force (leftward in FIG.4 ) approximately by an amount corresponding to the above-described increased thrust force generated in the HP system.
  • the thrust force generated in the whole steam turbine 1 is balanced.
  • the diameter of the LP dummy member 16 is designed in advance so as to balance the thrust forces in a case where the valves 41 and 43 are opened in the state where the supply of the reheat steam and the LP main steam is stopped and, the diameter of the IP dummy member 14 is designed in advance so as to balance the thrust forces in the normal operating state and the state where the supply of the HP main steam is stopped.
  • the thrust force is prevented from being generated at the IP dummy member 14 when the supply of the reheat steam and the LP main steam is stopped, and it becomes unnecessary to upsize the diameter of the LP dummy member 16, apart from the conventional technology in which the diameter upsizing was inevitable.
  • the diameter of the LP dummy member 16 can be small and the steam leakage to the gland can be reduced. As a result, the performance of the steam turbine can be enhanced.
  • FIG.5 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention in a case where the valve 43 is in an abnormal condition in the normal operating state of the steam turbine.
  • the control unit 52 determines that the valve 43 or 41 is not working properly.
  • the control unit 52 opens the valve 45.
  • FIG.6 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention, after taking a countermeasure against the malfunction of the valve 43 in the normal operating state of the steam turbine.
  • the steam outlet side of the IP dummy member 14 communicates with the steam outlet side of the IP blade cascade 4 via the conduit 44.
  • a part of the steam at the steam outlet side of the IP dummy member 14 streams to the steam outlet side of the IP blade cascade 4.
  • This causes the pressure at the steam outlet side of the IP dummy member 14 to drop so that the pressure difference between both sides of the IP dummy member 14 is generated, thereby generating the thrust force at the IP dummy member 14.
  • the resultant thrust force generated in the whole steam turbine 1 is balanced.
  • it is necessary to design the conduits 44 and the valve 45 in advance so that the steam flow rate through the conduit 44 is almost the same as the steam flow rate through the valve 43 when the valve 45 is opened in a case when the valve 43 is abnormally opened.
  • FIG.7 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention in a case where the valve 41 is in an abnormal condition in the normal operating state of the steam turbine.
  • the control unit 52 determines that the valve 43 or 41 is not working properly.
  • the control unit 52 opens the valve 45.
  • FIG.8 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention, after taking a countermeasure against the malfunction of the valve 41 in the normal operating state of the steam turbine.
  • the steam outlet side of the IP dummy member 14 communicates with the steam outlet side of the IP blade cascade 4 via the conduit 44. Then, a part of the steam at the steam outlet side of the IP dummy member 14 streams into the steam outlet side of the IP blade cascade 4. Thus, the pressure at the steam outlet side of the IP dummy member 14 drops so that the pressure difference between both sides of the IP dummy member 14 is generated. Accordingly, the thrust force is generated at the IP dummy member 14 so that the resultant thrust force generated in the whole steam turbine 1 is balanced.
  • FIG.9 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention, in a case where the function of the valve 43 is out of order while the supply of the reheat steam and the LP main steam is stopped
  • FIG.9 shows the case where the valve 43 stays closed.
  • both sides of the IP dummy member 14 are not in communication with each other.
  • the thrust force generated at the dummy member 14 causes the resultant thrust force generated in the whole steam turbine 1 to be unbalanced.
  • the diameter of the IP dummy member 14 is greater than that of the conventional IP dummy member. For a corresponding amount, the unbalance (i.e. being out of balance) regarding the developed resultant thrust force increases.
  • the pressure detected by the pressure sensor 56 provided on the thrust balance conduit 30 drops. When the detected pressure value drops below a prescribed value, then the control unit 52 (not shown in FIG.9 ) determines that the valve 43 is not working properly.
  • control unit 52 closes the valve 41.
  • FIG.10 shows an outline of a state of the steam turbine provided with the dummy members for adjusting thrust forces of the present invention, after taking a countermeasure against the malfunction of the valve 43 while the supply of the reheat steam and the LP main steam is stopped.
  • the resultant force is kept balanced, even when the abnormal condition regarding the valve 43 takes place.
  • the disclosed technology of the present invention is also applicable to HP-IP steam turbines.
  • FIG.11 shows an outline of a HP-IP steam turbine provided with the dummy members for adjusting thrust forces according to a second preferred embodiment of the present invention.
  • the HP-IP steam turbine 101 depicted in FIG.11 is provided with a turbine casing (not shown) is formed around a rotor shaft (not shown).
  • the turbine casing encloses the inlet parts (not shown) for introducing HP steam and IP steam.
  • a high-pressure (HP) chamber blade cascade 102 to which the HP steam is supplied and an intermediate-pressure (IP) chamber blade cascade 104 to which the IP steam is supplied are attached to the rotor shaft such that steam inlets of the HP chamber blade cascade 102 and the IP chamber blade cascade 104 are disposed facing each other. Further, between the steam inlet of the HP chamber blade cascade 102 and the steam inlet the IP chamber blade cascade 104, a first dummy member 111 and a second dummy member 112 are provided. Further, a third dummy member 113 is provided at a steam outlet of the HP chamber blade cascade 102.
  • a balance conduit 121 is provided to communicate a location between the first dummy member 111 and the second dummy member 112 to both sides of the third dummy member 113.
  • a balance conduit 122 is provided to communicate the steam outlet of the third dummy member 113 to the steam outlet of the IP chamber blade cascade 104.
  • a valve 141 is provided on the balance conduit 121 between both sides of the third dummy member 113 and the downstream side of the third dummy member 113 and a valve 142 is provided on the balance conduit 122.
  • the table in FIG.11 summarizes a balance of the thrust forces of the cases, when the turbine is operated normally, the supply of the HP steam is stopped (the HP system is closed), and the IP steam is stopped (the IP system is closed).
  • the figures of the thrust forces in the table of FIG.11 show not the absolute values but the relative ratios among thrust forces appearing in design calculations.
  • the resultant thrust force is substantially balanced when the HP system is closed.
  • the resultant thrust force becomes unbalanced because of the thrust force acting on the third dummy member 113 and the resultant thrust force increases rightward.
  • the valve 141 CV1
  • the pressure difference between both sides of the third dummy member 113 is reduced and thus, the resultant thrust force generated in the whole steam turbine can be balanced.
  • the pressure difference between both sides of the third dummy member 113 can be also reduced via the steam leakage through the dummy member 113, by appropriately closing the valve 142 instead of opening the valve 141. As a result, the resultant thrust force generated in the whole steam turbine can be balanced.
  • FIG.12 shows an outline of the HP-IP steam turbine provided with the dummy members for adjusting thrust forces according to a third preferred embodiment of the present invention.
  • FIG.12 As in FIG.11 are given common numerals and are not explained further.
  • a first dummy member 111' is provided.
  • the first dummy member 111' is formed by integrating the first dummy member 111 and the second dummy member 112 (shown in FIG.11 ), whose diameter is as same as the diameter of the first dummy member 111.
  • the steam turbine in FIG.12 is not provided with the balance conduit 121.
  • the balance conduit 122 is provided with a bypass conduit 123 that bypasses the valve 142.
  • an orifice 124 is provided on the bypass conduit 123.
  • the resultant thrust force can be balanced, except when the IP system is closed.
  • the resultant thrust force can be balanced by adjusting the opening of the valve 142.

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  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)

Claims (10)

  1. Turbine à vapeur ayant au moins une grille de pales haute pression (2), une grille de pales à pression intermédiaire (4) et une pluralité d'éléments factices (12, 14, 16) qui sont fixés sur un arbre de rotor commun (10), la turbine à vapeur étant caractérisée en ce qu'elle comprend :
    une unité de détection qui détecte un flux de vapeur dans une chambre à pression intermédiaire ;
    une unité de réduction de pression qui réduit une différence de pression entre deux côtés d'un élément factice à pression intermédiaire cible (14) de ladite pluralité d'éléments factices (12, 14, 16) lorsque le flux de vapeur dans la chambre à pression intermédiaire s'arrête, l'élément factice cible (14) ayant un côté communiquant avec une partie de la chambre à pression intermédiaire, l'unité de réduction de pression comprenant un premier conduit (42) qui raccorde les deux côtés de l'élément factice cible (14) ; et une première vanne (43) qui est prévue dans le premier conduit pour ajuster la différence de pression entre les deux côtés de l'élément factice cible (14) ; et
    une unité de commande (52) qui commande l'unité de réduction de pression sur la base d'un résultat de détection obtenu par l'unité de détection.
  2. Turbine à vapeur selon la revendication 1, comprenant en outre :
    un troisième conduit (44) qui raccorde le côté de l'unité de réduction de pression à une sortie de la chambre à pression intermédiaire ; et
    une troisième vanne (45) qui est prévue dans le troisième conduit (44),
    dans laquelle, lorsque la première vanne (43) s'ouvre alors que le flux de vapeur dans la chambre de pression intermédiaire n'est pas arrêté, l'unité de commande (52) commande la troisième vanne (45) afin qu'elle s'ouvre pour générer la différence de pression entre les deux côtés de l'élément factice cible (14).
  3. Turbine à vapeur selon la revendication 1 ou 2,
    dans laquelle l'unité de réduction de pression comprend :
    un deuxième conduit (30) qui raccorde une partie de la chambre à pression intermédiaire et le côté de l'élément factice cible ; et
    une deuxième vanne (41) qui est prévue dans le deuxième conduit (30) pour ajuster la différence entre les deux côtés de l'élément factice cible (14),
    dans laquelle la deuxième vanne (41) est fermée lorsque le flux de vapeur dans la chambre à pression intermédiaire s'arrête.
  4. Turbine à vapeur selon la revendication 3, comprenant en outre :
    un conduit de dérivation (123) qui est prévu pour contourner la deuxième vanne ; et
    un orifice (124) qui est prévu dans le conduit de dérivation (123).
  5. Turbine à vapeur selon la revendication 3, comprenant en outre :
    un troisième conduit (44) qui raccorde le côté de l'unité de réduction de pression à une sortie de la chambre à pression intermédiaire ; et
    une troisième vanne (45) qui est prévue dans le troisième conduit (44),
    dans laquelle, lorsque la deuxième vanne (41) se ferme alors que le flux de vapeur dans la chambre à pression intermédiaire n'est pas arrêté, l'unité de commande (52) commande la troisième vanne (45) afin qu'elle s'ouvre pour générer la différence de pression entre les deux côtés de l'élément factice cible (14).
  6. Procédé pour ajuster une force de poussée d'une turbine à vapeur selon l'une des revendications 1 à 5, ayant au moins une première grille de pales haute pression (2), une grille de pales à pression intermédiaire (4) et une pluralité d'éléments factices (12, 14, 16) qui sont fixés à un arbre de rotor commun (10), le procédé comprenant l'étape de :
    réduire une différence de pression entre les deux côtés d'un élément factice cible (14) de ladite pluralité d'éléments factices (12, 14, 16) lorsque le flux de vapeur dans la chambre à pression intermédiaire s'arrête, l'élément factice cible (14) ayant un côté communiquant avec une partie de la chambre à pression intermédiaire.
  7. Procédé pour ajuster la force de poussée de la turbine à vapeur selon la revendication 6,
    dans lequel la différence de pression entre les deux côtés de l'élément factice cible (14) peut être réduite à l'aide d'une première vanne (43) prévue dans un premier conduit (42) qui raccorde les deux côtés de l'élément factice cible (14).
  8. Procédé pour ajuster la force de poussée de la turbine à vapeur selon la revendication 7,
    dans lequel, lorsque la première vanne (43) s'ouvre, alors que le flux de vapeur dans la chambre à pression intermédiaire n'est pas arrêté, la différence de pression est générée entre les deux côtés de l'élément factice cible en ouvrant une troisième vanne (45) qui est prévue dans un troisième conduit (44) qui raccorde le côté de l'élément factice cible à une sortie de la chambre à pression intermédiaire.
  9. Procédé pour ajuster la force de poussée de la turbine à vapeur selon l'une quelconque des revendications 6 à 8,
    dans lequel la différence de pression entre les deux côtés de l'élément factice cible (14) peut être réduite à l'aide d'une deuxième vanne (41) prévue dans un deuxième conduit (30) qui raccorde une partie de la chambre à pression intermédiaire et le côté de l'élément factice cible (14).
  10. Procédé pour ajuster la force de poussée de la turbine à vapeur selon la revendication 9,
    dans lequel, lorsque la deuxième vanne (41) se ferme alors que le flux de vapeur dans la chambre à pression intermédiaire est arrêté, la différence de pression est générée entre les deux côtés de l'élément factice cible en ouvrant une troisième vanne (45) qui est prévue dans un troisième conduit (44) qui raccorde le côté de l'élément factice cible (14) à une sortie de la chambre à pression intermédiaire.
EP11800520.6A 2010-06-30 2011-05-13 Turbine à vapeur et procédé de réglage de la poussée d'une turbine à vapeur Active EP2589747B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010148624A JP5517785B2 (ja) 2010-06-30 2010-06-30 蒸気タービンおよび蒸気タービンのスラスト調整方法
PCT/JP2011/061109 WO2012002051A1 (fr) 2010-06-30 2011-05-13 Turbine à vapeur et procédé de réglage de la poussée d'une turbine à vapeur

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EP2589747A1 EP2589747A1 (fr) 2013-05-08
EP2589747A4 EP2589747A4 (fr) 2014-08-27
EP2589747B1 true EP2589747B1 (fr) 2018-08-15

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US (1) US20120017592A1 (fr)
EP (1) EP2589747B1 (fr)
JP (1) JP5517785B2 (fr)
KR (1) KR101466457B1 (fr)
CN (1) CN102906373B (fr)
WO (1) WO2012002051A1 (fr)

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CN112412548B (zh) * 2020-11-23 2021-12-31 东方电气集团东方汽轮机有限公司 一种汽轮机变工况下轴向推力的调整系统及其使用方法
KR102525617B1 (ko) * 2021-02-04 2023-04-24 한국수력원자력 주식회사 발전소의 밸런스 피스톤 축추력 조정 장치
CN113047911B (zh) * 2021-03-10 2022-01-14 东方电气集团东方汽轮机有限公司 一种推力平衡结构

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Also Published As

Publication number Publication date
CN102906373A (zh) 2013-01-30
WO2012002051A1 (fr) 2012-01-05
JP5517785B2 (ja) 2014-06-11
US20120017592A1 (en) 2012-01-26
JP2012012970A (ja) 2012-01-19
EP2589747A1 (fr) 2013-05-08
KR20130004403A (ko) 2013-01-09
KR101466457B1 (ko) 2014-11-28
EP2589747A4 (fr) 2014-08-27
CN102906373B (zh) 2015-02-18

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