EP2348196A2 - Dispositif de protection de turbine et procédé de commande pour une turbine à vapeur - Google Patents

Dispositif de protection de turbine et procédé de commande pour une turbine à vapeur Download PDF

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Publication number
EP2348196A2
EP2348196A2 EP10173147A EP10173147A EP2348196A2 EP 2348196 A2 EP2348196 A2 EP 2348196A2 EP 10173147 A EP10173147 A EP 10173147A EP 10173147 A EP10173147 A EP 10173147A EP 2348196 A2 EP2348196 A2 EP 2348196A2
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EP
European Patent Office
Prior art keywords
pressure
valve device
deaerator
turbine
shutdown valve
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
Application number
EP10173147A
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German (de)
English (en)
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EP2348196A3 (fr
EP2348196B1 (fr
EP2348196A8 (fr
Inventor
Yosuke Hirakawa
Mitsuru Sudo
Ichiro Hiraga
Tsugutomo Teranischi
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Mitsubishi Power Ltd
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Hitachi Ltd
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Publication of EP2348196A8 publication Critical patent/EP2348196A8/fr
Publication of EP2348196A3 publication Critical patent/EP2348196A3/fr
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Publication of EP2348196B1 publication Critical patent/EP2348196B1/fr
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Classifications

    • 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
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/14—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to other specific conditions
    • 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
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/20—Checking operation of shut-down devices
    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/345—Control or safety-means particular thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/28—Feed-water heaters, i.e. economisers or like preheaters for direct heat transfer, e.g. by mixing water and steam

Definitions

  • the present invention relates to a turbine protection device to protect a turbine of a steam turbine system.
  • a steam turbine system of an electric-power generating steam turbine plant is provided with a deaerator to store a condensate which is prepared by heating a condensate exhausted from a condenser using a extraction steam from a turbine so as to deaerate gases such as oxygen, etc.
  • a pressure within the deaerator (a deaerator internal pressure) is decreased from a pressure of the extraction steam (an extraction pressure) due to a pressure loss of a path through which the extraction steam passes from the turbine to the deaerator, thereby the deaerator internal pressure is balanced at a lower pressure than the extraction pressure.
  • the deaerator internal pressure may become equal to or greater than the extraction pressure.
  • the decompression speed of the extraction pressure deaerator internal pressure may become lower than the decompression speed, the balance between the deaerator internal pressure and the extraction pressure may break down, and the deaerator internal pressure may become equal to or higher than the extraction pressure.
  • a low-temperature steam flows from the deaerator to the turbine and a water induction is generated.
  • a flow of steam from the deaerator to the turbine is defined as a backflow. If the water induction is generated in the turbine, a casing and a rotor of the turbine at high temperature are cooled by the low-temperature steam suddenly, and then the casing and the rotor are deformed. Also, a contact between a rotational body such as the rotor and a stationary body such as the casing, or an abnormal vibration occurs, resulting in damage of the turbine. That is, it is necessary to suppress generation of the water induction. For this reason, it is necessary to prevent steam from flowing backward from the deaerator to the turbine.
  • a check valve is conventionally provided between the turbine and the deaerator so as to prevent the steam from flowing backward from the deaerator to the turbine. Further, a shutdown valve device is provided so as to interrupt the steam flowing between the turbine and the deaerator.
  • JP 11-148310 A discloses a technique for a water induction protection device which is provided with a shutdown valve (a shutdown valve device) to interrupt steam flowing between a feedwater heater and a turbine in a steam turbine system, and prevents the water induction from being generated when a water level of a feedwater heater is increased abnormally.
  • a shutdown valve a shutdown valve device
  • JP 11-148310 A for example, if a water level of a feedwater heater is increased by water leakage from a tube within the feedwater heater, the shutdown valve interrupts the steam flowing between the turbine and the feedwater heater so as to prevent the water induction from being generated.
  • JP 11-148310 A For example, if the technique disclosed in JP 11-148310 A is applied to the deaerator, it is possible to prevent the water induction caused by increase in the water level within the deaerator from being generated.
  • the check valve is instantaneously closed so as to prevent the steam from flowing backward from the deaerator to the turbine when the deaerator internal pressure is equal to or greater than the extraction pressure, for example, the check valve is instantaneously closed when the extraction pressure drops quickly (e.g., when the turbine trip occurs). Therefore, if the check valve is opened and closed frequently, a component such as a valve disc may be deformed by an impact at the time of closing the check valve, and the steam flowing backward from the deaerator to the turbine may not be interrupted completely.
  • an object of the present invention is to provide a turbine protection device which can interrupt the steam flowing backward from the deaerator to the turbine completely even if the check valve provided between the deaerator and the turbine can not interrupt the steam flowing between the deaerator and the turbine completely.
  • the present invention provides a turbine protection device comprising: a shutdown valve device, in which the shutdown valve device is operated so as to interrupt steam flowing backward from a deaerator to a turbine when a deaerator internal pressure is equal to or greater than an extraction pressure.
  • FIG. 1 in a steam turbine system 1 according to this embodiment, the steam generated in the boiler 13 rotates a high-pressure turbine 14, and is taken into a reheater 13a of the boiler 13.
  • the steam reheated by the reheater 13a rotates a middle-pressure turbine 15 and a low-pressure turbine 16, and is taken into a condenser 18 to be condensed into a condensate.
  • a generator 17 is connected to the low-pressure turbine 16 as a load.
  • the condensate generated by condensing the steam in the condenser 18 is pressurized by a condensate pump 19, is heated by a low-pressure heater 4 (e.g., using the extraction steam from the low-pressure turbine 16), is fed to the deaerator 5, is heated using the extraction steam from the middle-pressure turbine 15 (or the low-pressure turbine 16) so as to deaerate gases, and is stored in the deaerator 5.
  • the condensate stored in the deaerator 5 is pressurized by a feed pump 6, is heated in a high-pressure heater 7 (e.g., using the extraction steam from the high-pressure turbine 14 or the middle-pressure turbine 15), and is taken into the boiler 13.
  • the high-pressure turbine 14, the middle-pressure turbine 15, and the low-pressure turbine 16 are referred to as a turbine 2 in a mass.
  • the turbine 2 is connected to the deaerator 5 via an extraction steam inlet tube 3 (inlet tube), and the extraction steam from the turbine 2 passes through the extraction steam inlet tube 3 so as to be taken into the deaerator 5 as the extraction steam for heating and deaerating.
  • Two check valves 3a are connected to the extraction steam inlet tube 3 in series, and a flow direction of the steam in the extraction steam inlet tube 3 is limited to a direction from the turbine 2 to the deaerator 5.
  • the extraction steam inlet tube 3 is connected to any one or more of the high-pressure turbine 14, the middle-pressure turbine 15, and the low-pressure turbine 16.
  • an extraction pressure of the extraction steam from the turbine 2 (hereinafter, denoted by "P1") is decreased due to a pressure loss caused by passing through the extraction steam inlet tube 3. Therefore, at the time of normal operation of the steam turbine system 1, the deaerator internal pressure (hereinafter, denoted by "P2") becomes lower than the extraction pressure P1. That is, at the time of normal operation of the steam turbine system 1, the deaerator internal pressure P2 is balanced at a pressure which is lower than the extraction pressure P1 so as to prevent the steam from flowing backward from the deaerator 5 to the turbine 2.
  • the two check valves 3a are opened so as to allow the steam to flow from the turbine 2 to the deaerator 5 when the deaerator internal pressure P2 is less than the extraction pressure P1
  • the two check valves 3a are instantaneously closed so as to interrupt the steam flowing backward from the deaerator 5 to the turbine 2 when the deaerator internal pressure P2 is equal to or greater than the extraction pressure P1 at the time of an occurrence of the turbine trip, etc.
  • the extraction steam inlet tube 3 is provided with a shutdown valve device 12 between the two check valves 3a and the deaerator 5.
  • the shutdown valve device 12 includes a stop valve 12a to interrupt the steam flowing through the extraction steam inlet tube 3, and a valve driving unit 12b to open and close the stop valve 12a rapidly.
  • the valve driving unit 12b drives the stop valve 12a so as to close the extraction steam inlet tube 3, to interrupt the steam flowing backward from the deaerator 5 to the turbine 2, and to prevent an occurrence of a water induction, when a water level within the deaerator 5 measured by a water level gauge (not shown) becomes greater than a predetermined value.
  • the steam turbine system 1 includes a turbine extraction pressure gauge 9 to measure the extraction pressure P1 of the extraction steam from the turbine 2, a deaerator internal pressure gauge 10 to measure the deaerator internal pressure P2 of the deaerator 5, and a control unit 11 to control the shutdown valve device 12 by sending commands to the valve driving unit 12b.
  • the turbine extraction pressure gauge 9 is provided in proximity to a juncture between the turbine 2 and the extraction steam inlet tube 3, and measures the extraction pressure P1 on condition that the pressure loss caused by the extraction steam inlet tube 3 does not occur.
  • the control unit 11 calculates the extraction pressure P1 based on a measured signal input from the turbine extraction pressure gauge 9, and calculates the deaerator internal pressure P2 based on a measured signal input from the deaerator internal pressure gauge 10.
  • control unit 11 send commands to the valve driving unit 12b so as to drive the stop valve 12a to close the extraction steam inlet tube 3, when the deaerator internal pressure P2 becomes equal to or greater than the extraction pressure P1. That is, the shutdown valve device 12 is closed. Therefore, the stop valve 12a interrupts the steam flowing backward from the deaerator 5 to the turbine 2.
  • the deaerator internal pressure P2 is decreased.
  • the control unit 11 sends commands to the valve driving unit 12b so as to drive the stop valve 12a to open the extraction steam inlet tube 3. That is, the shutdown valve device 12 is opened.
  • the extraction steam from the turbine 2 passes through the extraction steam inlet tube 3 so as to be taken into the deaerator 5.
  • a turbine protection device 20 includes the turbine extraction pressure gauge 9, the deaerator internal pressure gauge 10, the control unit 11, and the shutdown valve device 12.
  • the extraction pressure P1 is P1H and the deaerator internal pressure P2 is P2H which is lower than P1H slightly
  • the steam turbine system 1 is in normal operation, for example, when an amount of electric-power generation required for the generator 17 (see FIG. 1 ) is decreased and the load of the turbine 2 drops
  • the extraction pressure P1 is decompressed to P1L at the time t1 associated with a drop in the load.
  • the deaerator internal pressure P2 is decreased to P2L at the time t2 associated with depression in the extraction pressure P1.
  • the deaerator internal pressure P2 when the decompression speed of the extraction pressure P1 is higher than that of the deaerator internal pressure P2, for example, the extraction pressure P1 is decreased to the deaerator internal pressure P2 at the time t3. After that, the deaerator internal pressure P2 is kept higher than the extraction pressure P1 until the time t4 at which the deaerator internal pressure P2 is decreased to P1L.
  • the control unit 11 controls the shutdown valve device 12 so that the shutdown valve device 12 (see FIG. 1 ) is closed from the time t5 at which a differential pressure ⁇ P, which is resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 when the steam turbine system 1 (see FIG. 1 ) is in normal operation, becomes equal to or greater than a first predetermined value ( ⁇ Pf1) which is set in advance till the time t6 at which the differential pressure ⁇ P becomes less than a second predetermined value ( ⁇ Pf2) which is set in advance. Also, after the time t6 at which the differential pressure ⁇ P becomes equal to or less than the second predetermined value ⁇ Pf2, the control unit 11 controls the shutdown valve device 12 to be closed.
  • the control unit 11 sends commands to the valve driving unit 12b (see FIG. 1 ) so that the stop valve 12a (see FIG. 1 ) closes the extraction steam inlet tube 3 so as to close the shutdown valve device 12 (see FIG. 1 ). Also, when the differential pressure ⁇ P becomes equal to or less than the second predetermined value ⁇ Pf2, the control unit 11 sends commands to the valve driving unit 12b so that the stop valve 12a opens the extraction steam inlet tube 3 so as to open the shutdown valve device 12. In this way, the control unit 11 controls the shutdown valve device 12 by sending commands based on the differential pressure ⁇ P between the deaerator internal pressure P2 and the extraction pressure P1.
  • the first predetermined value ⁇ Pf1 and the second predetermined value ⁇ Pf2 are set to values as small as possible.
  • the first predetermined value ⁇ Pf1 may differ from or may be the same as the second predetermined value ⁇ Pf2.
  • the first predetermined value ⁇ Pf1 and the second predetermined value ⁇ Pf2 may be "0". In the case where the first predetermined value ⁇ Pf1 is "0", the control unit 11 closes the shutdown valve device 12 (see FIG.
  • the control unit 11 opens the shutdown valve device 12 (see FIG. 1 ) when the extraction pressure P1 becomes equal to or greater than the deaerator internal pressure P2.
  • the first predetermined value ⁇ Pf1 and the second predetermined value ⁇ Pf2 are set as differential pressures resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2. Therefore, in the case the extraction pressure P1 is higher than the deaerator internal pressure P2, the first predetermined value ⁇ Pf1 and the second predetermined value ⁇ Pf2 becomes negative values.
  • this procedure is incorporated in a program which the control unit 11 runs as a subroutine, and may be run by the control unit 11 at intervals of 100 ms, etc.
  • the control unit 11 calculates the extraction pressure P1 (step S1), and further calculates the deaerator internal pressure P2 (step S2). As described above, the control unit 11 can calculate the extraction pressure P1 based on the measured signal input from the turbine extraction pressure gauge 9, and can calculate the deaerator internal pressure P2 based on the measured signal input from the deaerator internal pressure gauge 10. In this way, the control unit 11 calculates the extraction pressure P1 and the deaerator internal pressure P2 at every time the procedure to control the shutdown valve device 12 is executed. Therefore, the control unit 11 monitors the extraction pressure P1 and the deaerator internal pressure P2 at all times.
  • the control unit 11 calculates the differential pressure ⁇ P by subtracting the extraction pressure P1 from the deaerator internal pressure P2 (step S3). Also, when the calculated differential pressure ⁇ P is equal to or greater than the first predetermined value ⁇ Pf1 (step S4 --> Yes), if the shutdown valve device 12 is opened (step S5 --> Yes), the control unit 11 sends commands to the valve driving unit 12b so as to drive the stop valve 12a to close the shutdown valve device 12 (step S6), and the procedure to control the shutdown valve device 12 is completed (RETURN). If the shutdown valve device 12 is not opened (step S5 --> No), i.e., if the shutdown valve device 12 is closed, the procedure to control the shutdown valve device 12 is completed (RETURN).
  • step S4 --> No when the calculated differential pressure ⁇ P is less than the first predetermined value ⁇ Pf1 (step S4 --> No), if the differential pressure ⁇ P is greater than the second predetermined value ⁇ Pf2 (step S7 --> No), the control unit 11 completes the procedure to control the shutdown valve device 12 (RETURN). Also, when the differential pressure ⁇ P is equal to or less than the second predetermined value ⁇ Pf2 (step S7 --> Yes), if the shutdown valve device 12 is closed (step S8 --> Yes), the control unit 11 sends commands to the valve driving unit 12b so as to drive the stop valve 12a to open the shutdown valve device 12 (step S9), and completes the procedure to control the shutdown valve device 12 (RETURN). If the shutdown valve device 12 is not closed (step S8 --> No), i.e., if the shutdown valve device 12 is opened, the procedure to control the shutdown valve device 12 is completed (RETURN).
  • control unit 11 judges whether the shutdown valve device 12 is opened or closed is not limited.
  • the control unit 11 may includes a flag OP to indicate whether the shutdown valve device 12 is opened or closed, and the control unit 11 sets the flag OP to "0" in step S6 when the shutdown valve device 12 is closed and sets the flag OP to "1" in step S9 when the shutdown valve device 12 is opened.
  • the control unit 11 judges that the shutdown valve device 12 is opened if the flag OP is "1", and judges that the shutdown valve device 12 is closed if the flag OP is "0".
  • the shutdown valve device 12 may be provided with a sensor (not shown) to detect whether the stop valve 12a closes or opens the extraction steam inlet tube 3. For example, if the sensor (not shown) sends a detection signal to indicate whether the stop valve 12a closes or opens the extraction steam inlet tube 3 to the control unit 11, the control unit 11 can detect whether the stop valve 12a closes or opens the extraction steam inlet tube 3 based on the detection signal from the sensor (not shown). Also, the control unit 11 can judge whether the shutdown valve device 12 is opened or closed.
  • the control unit 11 of the steam turbine system 1 monitors the extraction pressure P1 and the deaerator internal pressure P2 at all times, closes the shutdown valve device 12 when the differential pressure ⁇ P resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 becomes equal to or greater than the first predetermined value ⁇ Pf1, and opens the shutdown valve device 12 when the differential pressure ⁇ P becomes equal to or less than the second predetermined value ⁇ Pf2.
  • the turbine extraction pressure gauge 9 measures the extraction pressure P1
  • the measured value can slightly change.
  • the measured value of the deaerator internal pressure gauge 10 can slightly change. Therefore, the extraction pressure P1 and the deaerator internal pressure P2 calculated by the control unit 11 can also slightly change, and further the differential pressure ⁇ P resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 can also slightly change.
  • the control unit 11 sends commands to the valve driving unit 12b so as to close the shutdown valve device 12 at every time the differential pressure ⁇ P becomes equal to or greater than the first predetermined value ⁇ Pf1, and sends commands to the valve driving unit 12b so as to open the shutdown valve device 12 at every time the differential pressure ⁇ P becomes equal to or less than the second predetermined value ⁇ Pf2. Therefore, the control unit 11 frequently sends commands to the valve driving unit 12b so as to control the shutdown valve device 12, and the shutdown valve device 12 is opened and closed frequently. As a result, there arises a problem that the stop valve 12a and the shutdown valve device 12 are degraded.
  • the control unit 11 may be provided with an internal timer, and may close the shutdown valve device 12 when a condition that the differential pressure ⁇ P resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 is equal to or greater than the first predetermined value ⁇ Pf1 continues for a predetermined time period.
  • the control unit 11 may open the shutdown valve device 12.
  • FIG. 4 a procedure by which the control unit 11 having the internal timer controls the shutdown valve device 12 (see FIGS. 1 and 2 ). Like the procedure shown in FIG. 3 , this procedure is incorporated in a program which the control unit 11 runs as a subroutine, and may be run by the control unit 11 at intervals of 100 ms, etc.
  • the same reference numbers are used to denote the same steps as those in FIG. 3 , and their repeated explanations will be omitted.
  • the control unit 11 calculates the extraction pressure P1 (step S1), calculates the deaerator internal pressure P2 (step S2), and further calculates the differential pressure ⁇ P by subtracting the extraction pressure P1 from the deaerator internal pressure P2 (step S3). Also, when the calculated differential pressure ⁇ P is equal to or greater than the first predetermined value ⁇ Pf1 (step S4 --> Yes), the control unit 11 stops a measuring of an opening valve waiting time (step S10), and if the shutdown valve device 12 is opened (step S5 --> Yes), the control unit 11 judges whether a closing valve waiting time is being measured or not (step S11).
  • the opening valve waiting time means a waiting time during which the differential pressure ⁇ P resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 becomes equal to or less than the second predetermined value ⁇ Pf2 and the control unit 11 opens the shutdown valve device 12.
  • the closing valve waiting time means a waiting time during which the differential pressure ⁇ P resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 becomes equal to or greater than the first predetermined value ⁇ Pf1 and the control unit 11 closes the shutdown valve device 12.
  • step S11 --> No the control unit 11 starts measuring of the closing valve waiting time by the internal timer (step S12), and the procedure to control the shutdown valve device 12 is completed (RETURN). Also, if the closing valve waiting time is being measured (step S11 --> Yes), in the case where a predetermined time Tm1 (a first predetermined time) has elapsed since measuring of the closing valve waiting time started (step S13 --> Yes), the control unit 11 closes the shutdown valve device 12 (step S6) and completes the procedure to control the shutdown valve device 12 (RETURN), and in the case where the predetermined time Tm1 has not elapsed (step S13 --> No), the control unit 11 completes the procedure to control the shutdown valve device 12 (RETURN) without closing the shutdown valve device 12.
  • Tm1 a first predetermined time
  • step S5 if the shutdown valve device 12 is not opened (step S5 --> No), i.e., if the shutdown valve device 12 is closed, the control unit 11 completes the procedure to control the shutdown valve device 12 (RETURN).
  • step S13 for example, the predetermined time Tm1 to determine whether the shutdown valve device 12 should be closed or not may be determined as a time during which the control unit 11 can close the shutdown valve device 12 with the proper timing based on an experiment, etc.
  • step S4 when the calculated differential pressure ⁇ P is less than the first predetermined value ⁇ Pf1 (step S4 --> No), the control unit 11 compares the differential pressure ⁇ P and the second predetermined value ⁇ Pf2 (step S7). Also, when the differential pressure ⁇ P is greater than the second predetermined value ⁇ Pf2 (step S7 --> No), the control unit 11 completes the procedure to control the shutdown valve device 12 (RETURN). Also, when the differential pressure ⁇ P is equal to or less than the second predetermined value ⁇ Pf2 (step S7 --> Yes), the control unit 11 stops the measuring of the closing valve waiting time (step S14).
  • step S8 --> Yes the control unit 11 judges whether the opening valve waiting time is being measured or not (step S15). In addition, when the shutdown valve device 12 is not closed (step S8 --> No), i.e., when the shutdown valve device 12 is opened, the control unit 11 completes the procedure to control the shutdown valve device 12 (RETURN).
  • step S15 --> No the control unit 11 starts measuring of the opening valve waiting time by the internal timer (step S16), and completes the procedure to control the shutdown valve device 12 (RETURN). Also, if the opening valve waiting time is being measured (step S15 --> Yes), in the case where the predetermined time Tm2 (a second predetermined time) has elapsed since measuring of the opening valve waiting time started (step S17 --> Yes), the control unit 11 closes the shutdown valve device 12 (step S9) and completes the procedure to control the shutdown valve device 12 (RETURN), and in the case where the predetermined time Tm2 has not elapsed (step S17 --> No), the control unit 11 completes the procedure to control the shutdown valve device 12 (RETURN) without opening the shutdown valve device 12.
  • Tm2 a second predetermined time
  • the predetermined time Tm2 to determine whether the shutdown valve device 12 should be opened or not may be determined as a time during which the control unit 11 can open the shutdown valve device 12 with the proper timing based on an experiment, etc., and may be the same as or differ from the predetermined time Tm1 in step S13.
  • the control unit 11 when the differential pressure ⁇ P resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 is equal to or greater than the first predetermined value ⁇ Pf1, the control unit 11 (see FIG. 1 ) starts measuring of the closing valve waiting time by the internal timer (step S12), and when the predetermined time Tm1 has elapsed on condition that the differential pressure ⁇ P is equal to or greater than the first predetermined value ⁇ Pf1, the control unit 11 closes the shutdown valve device 12 (see FIG. 1 )(step S13).
  • the control unit 11 when the differential pressure ⁇ P resulted from subtracting the extraction pressure P1 from the deaerator internal pressure P2 is equal to or less than the second predetermined value ⁇ Pf2, the control unit 11 (see FIG. 1 ) starts measuring of the opening valve waiting time by the internal timer (step S16), and when the predetermined time Tm2 has elapsed on condition that the differential pressure ⁇ P is equal to or less than the second predetermined value ⁇ Pf2, the control unit 11 opens the shutdown valve device 12 (see FIG. 1 )(step S17).
  • the control unit 11 does not close the shutdown valve device 12. o
  • the control unit 11 does not open the shutdown valve device 12. Therefore, the shutdown valve device 12 is prevented form being operated frequently so as to suppress the problem that the shutdown valve device 12 is degraded.
  • the control unit 11 monitors the extraction pressure P1 and the deaerator internal pressure P2 at all times.
  • the control unit 11 closes the shutdown valve device 12 so as to interrupt the steam flowing backward from the deaerator 5 to the turbine 2 by the stop valve 12a.
  • the steam turbine system 1 can interrupt the steam flowing through the extraction steam inlet tube 3 by the stop valve 12a of the shutdown valve device 12, and can interrupt the steam flowing backward from the deaerator 5 to the turbine 2 effectively.
  • the control unit 11 closes the shutdown valve device 12.
  • the control unit 11 opens the shutdown valve device 12. In this way, the shutdown valve device 12 is prevented from being operated frequently so as to suppress the problem that the shutdown valve device 12 is degraded.
  • the control unit 11 can close the shutdown valve device 12. Therefore, even if two check valves 3 a can not interrupt the steam flowing through the extraction steam inlet tube 3 completely, the steam flowing backward from the deaerator 5 to the turbine 2 can be interrupted completely, and the turbine 2 can be prevented from being damaged.
  • the turbine protection device 20 is provided between the deaerator 5 and the turbine 2 in this embodiment as shown in FIG. 1 , for example, the turbine protection device 20 according to this embodiment may be provided between the feedwater heater (not shown) and the turbine 2. In this case, even if the pressure within the feedwater heater becomes higher than the extraction pressure P1, the steam flowing backward from the feedwater heater to the turbine 2 can be interrupted by the stop valve 12a, and the turbine 2 can be prevented from being damaged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Turbines (AREA)
EP10173147.9A 2009-08-18 2010-08-18 Dispositif de protection de turbine et procédé de commande pour une turbine à vapeur Active EP2348196B1 (fr)

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JP2009189423A JP5118672B2 (ja) 2009-08-18 2009-08-18 タービン保護装置

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EP2348196A2 true EP2348196A2 (fr) 2011-07-27
EP2348196A8 EP2348196A8 (fr) 2011-09-28
EP2348196A3 EP2348196A3 (fr) 2017-06-14
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CN103954022A (zh) * 2014-04-09 2014-07-30 美的集团股份有限公司 温度检测保护装置和空调器
CN109488394A (zh) * 2018-10-19 2019-03-19 哈尔滨汽轮机厂有限责任公司 百万核电汽轮机控制系统机堆协调的控制方法
CN109091013B (zh) * 2018-10-30 2021-03-16 四川爱创科技有限公司 咖啡机系统开机防干烧方法
JP7093319B2 (ja) 2019-02-21 2022-06-29 三菱重工業株式会社 汽力プラントの復水給水系統及び汽力プラント復水給水系統の運転方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11148310A (ja) 1997-11-19 1999-06-02 Toshiba Eng Co Ltd 蒸気タービンプラントのウォータインダクション防止装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515651A (en) * 1947-10-04 1950-07-18 Reconstruction Finance Corp Steam heating system
DE971506C (de) * 1953-11-27 1959-02-05 Brown Schalt- und Regeleinrichtung fuer Dampfkraftanlagen mit Zwischenueberhitzung bei veraenderlichem Zwischendruck
US3955358A (en) * 1974-08-08 1976-05-11 Westinghouse Electric Corporation Combined cycle electric power plant and a heat recovery steam generator with improved fluid level control therefor
JPS5124438A (en) * 1974-08-09 1976-02-27 Hitachi Ltd Karyokuburantono kyusokufukaseigensochi
JPS56117004A (en) * 1980-02-20 1981-09-14 Hitachi Ltd Method and device for controlling pressure of deaerator
JPS56132409A (en) * 1980-03-19 1981-10-16 Hitachi Ltd Method of controlling operation pressure of deaerator
JPS61205309A (ja) * 1985-03-08 1986-09-11 Hitachi Ltd 給水加熱器の保護運転方法及びその装置
US4819436A (en) * 1988-05-26 1989-04-11 General Electric Company Deaerator pressure control system
JPH08210107A (ja) * 1995-02-01 1996-08-20 Fuji Electric Co Ltd 抽気蒸気タービンプラント
US7416294B2 (en) * 2004-02-19 2008-08-26 Fujifilm Corporation Image forming apparatus and liquid control method
JP4158120B2 (ja) * 2006-05-18 2008-10-01 株式会社日立製作所 蒸気タービンプラント

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11148310A (ja) 1997-11-19 1999-06-02 Toshiba Eng Co Ltd 蒸気タービンプラントのウォータインダクション防止装置

Also Published As

Publication number Publication date
EP2348196A3 (fr) 2017-06-14
EP2348196B1 (fr) 2019-10-09
US20110041503A1 (en) 2011-02-24
JP5118672B2 (ja) 2013-01-16
JP2011038500A (ja) 2011-02-24
EP2348196A8 (fr) 2011-09-28

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