JP2007211683A - Control device of steam turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the safety by reducing the burden of a worker and securing a stable turbine start-up time in a control device of a steam turbine. <P>SOLUTION: This control device of the steam turbine is provided with a governing valve 14 in a steam pipe line 13 for supplying steam from a boiler 11 to a steam turbine 12, a start-up speed control piston 31 increasing an opening of the governing valve based on a start-up command value to enhance the rotating speed of the steam turbine 12, and a speed control governor 32 controlling the opening of the governing valve 14 and controlling the rotating speed of the steam turbine 12 to a specified speed; and the control device 34 controls to change over between the start-up speed control piston 31 and the speed control governor 32 according to the operation state of the steam turbine 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steam turbine control apparatus that can stably and automatically start a steam turbine at a predetermined start time.

  The steam turbine secures power by driving and rotating the rotor via the moving blades with the supplied steam. In order to secure a stable driving force, the rotor is maintained at a constant rotational speed. There is a need. Generally, steam supplied to the steam turbine is provided by providing a steam control valve in a supply passage for supplying steam to the steam turbine, and controlling the opening of the steam control valve using a governor (governor). The amount is adjusted and the turbine speed is controlled.

  As a steam turbine control device using such a speed control device, there is one described in Patent Document 1 below.

JP 05-321604 A

  In the conventional steam turbine control device described above, the amount of steam to the steam turbine is adjusted by adjusting the opening degree of the steam control valve by the speed governor, and the turbine speed is controlled. However, this speed governor adjusts the opening of the steam control valve by feeding back the rotation speed of the rotor of the steam turbine, and adjusts the opening of the steam control valve when the turbine is started. It is difficult to perform control that gradually increases the amount of steam and increases the turbine speed.

  For this reason, conventionally, a steam control valve is provided in the supply passage for supplying steam to the steam turbine, and a manual operation valve is provided on the upstream side thereof. When the turbine is started, the operation is performed with the opening of the steam control valve fully opened. By gradually opening the manual operation valve, the person gradually increases the amount of steam supplied to the steam turbine and increases the turbine speed.

  However, if a large amount of steam is supplied to the steam turbine when the turbine is started, the impact may damage the rotor blades, etc., and the operator operates the manually operated valve to gradually increase the opening. There is a problem that the work to go is difficult and the burden on the worker is large. In addition, when a steam turbine is used in a nuclear power plant, it is necessary to secure a turbine startup time that satisfies the requirements of the plant in consideration of safety. It is difficult to secure time.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a steam turbine control device that reduces the burden on an operator and secures a stable turbine startup time to improve safety. .

  In order to achieve the above object, a steam turbine control device according to a first aspect of the present invention includes a steam amount adjusting valve provided in a steam passage for supplying steam to the steam turbine, and the steam amount adjusting based on a start command value. A first speed control means for increasing the rotational speed of the steam turbine by increasing the opening of the valve, and the rotational speed of the steam turbine is controlled to a predetermined rotational speed by adjusting the opening of the steam amount adjusting valve. And a control means for switching the speed adjusting means for adjusting the opening degree of the steam amount adjusting valve in accordance with the operating state of the steam turbine.

  In a steam turbine control device according to a second aspect of the present invention, the steam amount adjusting valve has a valve body capable of opening and closing the steam passage, and one end of an opening adjusting rod supported rotatably is the valve. The opening adjustment rod is urged and supported in a direction in which the valve body opens the steam passage, and the hydraulic piston as the first speed adjusting means is connected to the body in accordance with the supply hydraulic pressure. The steam passage can be closed by the valve body by pressing the other end of the adjusting rod.

  In the steam turbine control device according to a third aspect of the invention, the hydraulic piston is capable of closing the steam passage by the valve body by pressing the other end of the opening adjustment rod by a built-in compression spring. By supplying hydraulic pressure to the hydraulic piston, it is possible to release the pressure to the other end of the opening adjustment rod and open the steam passage by the valve body.

  In the steam turbine control device according to a fourth aspect of the present invention, a flow rate adjusting valve is provided in a hydraulic pipe that supplies hydraulic pressure to the hydraulic piston, and the control means controls the opening of the flow rate adjusting valve in accordance with a start command value. It is characterized by setting.

  In the steam turbine control device according to the fifth aspect of the present invention, the steam amount adjusting valve has a valve body capable of opening and closing the steam passage, and one end of an opening adjusting rod supported rotatably is the valve. And the opening adjustment rod is biased and supported in a direction in which the valve body opens the steam passage, and the control rod of the first speed control means is opened in the low rotation region of the steam turbine. It is engageable with the other end of the degree adjusting rod, and the control rod of the second speed adjusting means can be engaged with the other end of the opening adjusting rod in the high rotation region of the steam turbine. It is said.

  According to the steam turbine control device of the first aspect of the present invention, the steam amount adjusting valve is provided in the steam passage for supplying the steam to the steam turbine, and the opening degree of the steam amount adjusting valve is increased based on the start command value. A first speed control means for increasing the rotational speed of the steam turbine, a second speed control means for controlling the rotational speed of the steam turbine to a predetermined rotational speed by adjusting the opening of the steam amount adjusting valve, Since the control means for switching the speed adjusting means for adjusting the opening degree of the steam amount adjusting valve according to the operating state is provided, when the turbine starts, the first speed adjusting means opens the opening amount of the steam amount adjusting valve based on the start command value. Is increased to increase the rotational speed of the steam turbine. Thereafter, when the rotational speed of the steam turbine exceeds a predetermined rotational speed, the second speed control means adjusts the opening of the steam amount control valve to rotate the rotational speed of the steam turbine. Will be controlled to a predetermined speed. It is possible to reduce the burden on the worker at the time of turbine starting, it is possible to improve safety by ensuring a stable turbine starting time.

  According to the steam turbine control device of the second aspect of the present invention, one end of the opening adjustment rod that is rotatably supported is connected to the valve body of the steam amount adjustment valve, and the opening adjustment rod is connected to the valve body. Urged and supported in the direction to open the steam passage, and the steam passage can be closed by the valve body by pressing the other end of the opening adjustment rod according to the hydraulic pressure supplied to the hydraulic piston as the first speed adjusting means. Therefore, it is possible to close the steam passage by moving the valve body via the opening adjustment rod by the hydraulic pressure supplied to the hydraulic piston, and with a simple configuration, the steam amount at the start of the turbine is adjusted to properly control the steam turbine. The number of rotations can be increased.

  According to the steam turbine control apparatus of the third aspect of the invention, the other end of the opening adjustment rod is pressed by the compression spring built in the hydraulic piston, and the steam passage can be closed by the valve body. Since the steam passage can be opened by the valve body by releasing the pressure on the other end of the opening adjustment rod by supplying hydraulic pressure to the valve, the compression spring of the hydraulic piston moves the opening passage through the opening adjustment rod when the turbine is stopped. The steam passage is closed by the valve body, and when the turbine is started, the steam passage is opened by the valve body by supplying hydraulic pressure to the hydraulic piston and releasing the pressure to the opening adjustment rod. Steam can be supplied automatically.

  According to the steam turbine control device of the fourth aspect of the present invention, the flow rate adjusting valve is provided in the hydraulic pipe for supplying the hydraulic pressure to the hydraulic piston, and the control means sets the opening of the flow rate adjusting valve according to the start command value. When the turbine is started, the control means can set the opening of the flow rate adjusting valve based on the start command value to supply a predetermined amount of hydraulic pressure to the hydraulic piston, and stably supply steam when starting the turbine be able to.

  According to the steam turbine control device of the fifth aspect of the invention, one end of the opening degree adjusting rod supported rotatably is connected to the valve body of the steam amount adjusting valve, and the opening degree adjusting rod is connected to the valve body. Is supported in the direction of opening the steam passage, and the control rod of the first speed control means can be engaged with the other end of the opening adjustment rod in the low rotation region of the steam turbine, and in the high rotation region of the steam turbine. Since the control rod of the second speed adjusting means can be engaged with the other end of the opening adjustment rod, the turbine speed is controlled using the first speed adjusting means in the low rotation region of the steam turbine, and the steam turbine In the high speed region, the turbine speed is controlled using the second speed control means, and by switching the speed control means appropriately, a stable turbine start-up time is secured and safety is improved. Can do.

  Exemplary embodiments of a control apparatus for a steam turbine according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a schematic configuration diagram showing a steam turbine control device according to one embodiment of the present invention, and FIG. 2 is a control rod and an opening adjustment rod of an activation speed control piston in the steam turbine control device of this embodiment. FIG. 3 is a cross-sectional view of the steam amount adjusting valve in the steam turbine control device of the present embodiment.

  The steam turbine of the present embodiment is used for driving an auxiliary feed water pump arranged in parallel with the feed water pump when the feed water pump that supplies the secondary cooling water to the steam generator is not operated in the nuclear power plant. It is important to ensure a stable turbine startup time.

  In the steam turbine system, as shown in FIG. 3, a steam control valve 14 as a steam amount adjusting valve is provided in a steam pipe 13 that supplies steam generated in the boiler 11 to the steam turbine 12. In the steam control valve 14, a hollow casing 16 is fixed to the support ring 15, and a steam passage 17 communicating with the steam pipe 13 is formed in the casing 16. A partition wall portion 18 having a U-shaped cross section that divides the upstream side and the downstream side is formed in the steam passage 17, and a communication passage 19 is formed in the partition wall portion 18. The valve body 20 is movably located in the communication passage 19 of the steam passage 17 in the casing 16, and can open and close the communication passage 19 and adjust the flow area (opening). One end portion of the operating rod 21 is fixed to the support portion 20a of the valve body 20, and the other end portion of the operating rod 21 is rotatably supported by the mounting piece 15a of the support ring 15. One end of the first connecting rod 22 is connected to the other end of the first connecting rod 22, and one end of the second connecting rod 23 is connected to the other end of the first connecting rod 22.

  On the other hand, as shown in FIG. 1, the steam turbine control device of this embodiment, which controls the rotation speed of the steam turbine 12 by controlling the opening and closing of the steam control valve 14 of the steam turbine system described above, During the start-up operation, the start speed control piston as the first speed control means for controlling the rotation speed of the steam turbine 12 to increase by adjusting (increasing) the opening of the steam control valve 14 based on the start command value. (Hydraulic piston) 31 and a speed control governor as a second governing means for controlling the rotation speed of the steam turbine 12 to a predetermined rotation speed by adjusting the opening of the steam control valve 14 during steady operation of the steam turbine 12. 32 and a speed limiting governor 33, and two speed adjusting means for adjusting the opening degree of the steam control valve 14 according to the operating state of the steam turbine 12, that is, an activation speed control piston And a 1 and a control unit 34 for switching between the governor 32 and 33.

  In the starting speed control piston 31, a disk-shaped piston 36 is fitted in a sealed cylinder 35 and is supported so as to be movable in the vertical direction, and a compression spring built in the cylinder 35. 37 is biased and supported downward. A control rod 38 is fixed to the piston 36, and the tip end portion of the control rod 38 extends outside the cylinder 35. The cylinder 35 is divided into a first chamber 39 and a second chamber 40 by a piston 36, and first and second ports 41 and 42 for supplying and discharging hydraulic pressure are provided in the chambers 39 and 40, respectively. Yes.

  A first hydraulic pipe 44 extending from the hydraulic tank 43 to the first port 41 is provided. The first hydraulic pipe 44 includes a hydraulic pump 45, a needle valve (flow adjustment valve) 46, an electromagnetic valve 47, and a three-way valve 48. Is provided. A second hydraulic pipe 49 is provided from the hydraulic tank 43 to the second port 42, and a switching pipe 50 connected to the three-way valve 48 is provided in the second hydraulic pipe 49.

  Therefore, in a state where no hydraulic pressure is supplied to the start speed control piston 31, the piston 36 is supported at the lowered position by the urging force of the compression spring 37. From this state, the switching pipe 50 side of the three-way valve 48 remains closed. When the hydraulic pump 45 is driven by opening the needle valve 46, the electromagnetic valve 47, and the three-way valve 48, the hydraulic pressure in the hydraulic tank 43 is supplied to the activation speed control piston 31 through the first hydraulic pipe 44, and the first port 41 One chamber 39 is supplied. Then, by supplying hydraulic pressure to the first chamber 39, the piston 36 rises against the urging force of the compression spring 37, and the control rod 38 integrated with the piston 36 can be raised. At this time, by adjusting the opening degree of the needle valve 46 by the control device 34, the hydraulic pressure supplied to the starting speed control piston 31 can be adjusted, and the speed at which the control rod 38 is raised can be controlled. When the piston 36 moves up, the hydraulic pressure in the second chamber 40 is returned to the hydraulic tank 43 through the second hydraulic pipe 49. When the driving of the hydraulic pump 45 is stopped and the switching pipe 50 side of the three-way valve 48 is opened, the hydraulic pressure in the first chamber 39 is changed to the first hydraulic pipe 44, the three-way valve 48, the switching pipe 50, and the second hydraulic pipe. The control rod 38 can be lowered together with the piston 36 by being returned to the hydraulic tank 43 through 49.

  On the other hand, the speed control governor 32 and the speed limiting governor 33 have substantially the same structure, and the speed control governor 32 controls the rotational speed of the steam turbine 12 by the amount of steam in the region up to the rated rotational speed of the steam turbine 12. The speed limiting governor 33 is a fail-safe governor for the speed control governor 32, and in the region up to the upper limit rotational speed higher than the rated rotational speed of the steam turbine 12, the rotational speed of the steam turbine 12 depends on the amount of steam. To control.

  That is, a speed control governor 32 and a speed limiting governor 33 are mounted adjacently on the upper portion of the housing 51, and detection rods 52 and 53 are extended downward. On the other hand, a driving gear 55 is fixed to the main shaft (rotor) 54 of the steam turbine 12, and driven gears 56, 57 mesh with both sides of the driving gear 55, and the driven gears 56, 57 are driven. The shafts 58 and 59 are rotatably supported by the housing 51, and the upper ends are connected to the detection rods 52 and 53. Further, output shafts 60 and 61 protrude from the side portions of the governors 32 and 33, and control rods 62 and 63 are connected to the output shafts 60 and 61 and extend downward.

  Accordingly, when the control device 34 outputs the command values to the speed control governor 32 and the speed limiting governor 33, the governors 32 and 33 are connected to the control rods 62 and 61 via the output shafts 60 and 61 in accordance with the command values. 63 can be moved up and down. In this case, each governor 32, 33 detects the rotational speed of the main shaft 54 of the steam turbine 12 through the drive gear 55, the driven gears 56, 57, the driven shafts 58, 59, and the detection rods 52, 53. Feedback control is performed.

  In addition, an opening adjustment rod 64 is rotatably supported in a position below the start speed control piston 31, the speed control governor 32, and the speed limiting governor 33. The other end of the second connecting rod 23 reaching the control valve 14 is connected, and a tension spring 65 is locked to the other end. In this case, the opening adjusting rod 64 is urged clockwise in FIG. 1 by the tension spring 65, so that the second connecting rod 23, the first connecting rod 22, and the operation are operated as shown in FIG. 3. The valve body 20 is urged and supported through a rod 21 in a direction to open the communication passage 19 of the steam passage 17 in the steam control valve 14.

  As shown in FIG. 2, the control rod 38 of the start speed control piston 31 has a pair of support pieces 66a and 66b fixed to a tip portion at a predetermined interval by a connecting pin 67, and the support pieces 66a and 66b have an opening degree. The adjustment rod 64 is clamped. In this case, the opening adjustment rod 64 is urged upward in FIG. 2 by the urging force of the tension spring 65, and the connecting pin 67 of the control rod 38 presses the upper surface portion of the opening adjustment rod 64. it can.

  Therefore, when the control rod 38 of the starting speed control piston 31 is lowered by the urging force of the compression spring 37, the connecting pin 67 presses the opening adjustment rod 64 and descends in FIG. 14 communication passages 19 are closed. On the other hand, when the control rod 38 is raised, the connecting pin 67 stops pressing the opening adjustment rod 64, and the opening adjustment rod 64 is raised in FIG. 2 by the tension spring 65, that is, rotated clockwise in FIG. The valve body 20 can open the communication passage 19 of the steam control valve 14.

  In this case, in the control rod 38, the support pieces 66a and 66b hold the opening adjustment rod 64, and the connecting pin 67 can press the opening adjustment rod 64 when lowered, but the support pieces 66a and 66b when raised. The stroke of the control rod 38 and the rotation range of the opening adjustment rod 64 are set so that the holding state of the opening adjustment rod 64 is not released.

  Note that the control rods 62 and 63 of the speed control governor 32 and the speed limiting governor 33 also support the opening degree adjusting rod 64 with the support piece provided at the tip, similarly to the control rod 38 of the start speed control piston 31. The connecting pins can push the opening adjusting rod 64 downward and the stroke of the control rods 62 and 63 and the opening adjusting rod so that the holding state of the opening adjusting rod by the support piece is not released when it is raised. 64 rotation ranges are set.

  In the steam turbine control apparatus of the present embodiment configured as described above, when the steam turbine 12 is stopped without requiring the driving force of the steam turbine 12, as shown in FIGS. The device 34 stops the hydraulic pressure supply to the start speed control piston 31 and stops the operation of the speed control governor 32 and the speed limiting governor 33. That is, in the starting speed control piston 31, the piston 36 is positioned in the lowered position by the biasing force of the compression spring 37 that is larger than the biasing force of the tension spring 65, and the control rod 38 integrated with the piston 36 is connected to the connecting pin 67. 1 presses the opening adjustment rod 64 and rotates counterclockwise in FIG. 1, and the valve body 20 is connected to the steam control valve 14 via the second connection rod 23, the first connection rod 22, and the operation rod 21. The communication passage 19 of the steam passage 17 is closed. On the other hand, in the speed control governor 32 and the speed limiting governor 33, the control rods 62 and 63 are positioned above the opening adjustment rod 64, and the opening adjustment rod 64 is not pressed.

  When the steam turbine 12 is started from such a state of the steam turbine 12, the control device 34 opens the needle valve 46, the electromagnetic valve 47, and the three-way valve 48 to drive the hydraulic pump 45, and the inside of the hydraulic tank 43. Is supplied from the first hydraulic pipe 44 to the first port 41 of the start speed control piston 31 to pressurize the first chamber 39. Then, the first chamber 39 is pressurized, so that the piston 36 rises against the urging force of the compression spring 37 and raises the control rod 38 integrated with the piston 36. When the control rod 38 is raised, the pressing of the opening adjustment rod 64 is released by the connecting pin 67, and the opening adjustment rod 64 is rotated clockwise in FIG. 1 by the urging force of the tension spring 65. The valve body 20 opens the communication passage 19 of the steam passage 17 in the steam control valve 14 through the second connection rod 23, the first connection rod 22, and the operation rod 21.

  At this time, an appropriate turbine start-up time is set in accordance with a device (in this embodiment, an auxiliary feed water pump) that operates on the steam turbine with a driving force of 12, and the control device 34 determines the turbine start-up time (turbine start-up time). The opening degree of the needle valve 46 is adjusted according to the command value. Therefore, the amount of hydraulic pressure supplied per unit time to be supplied to the starting speed control piston 31 is defined by the set opening of the needle valve 46, whereby the rising speed of the control rod 38 is set, and the steam control valve The opening speed of the communication passage 19 is defined by the valve body 20 at 14. Accordingly, when the valve body 20 of the steam control valve 14 opens the communication passage 19 at a predetermined opening speed, the steam of the boiler 11 is supplied to the steam turbine at a predetermined speed, and the turbine speed is set at a predetermined speed. To rise.

  When the control rod 38 of the starting speed control piston 31 is raised to the highest position, the valve body 20 opens the communication passage 19 of the steam passage 17 in the steam control valve 14 to 50% through the opening adjustment rod 64 and the like. The rotational speed of the steam turbine 12 increases to 50% of the rated rotational speed (low rotational speed region). Then, the control rod 38 of the starting speed control piston 31 is separated from the opening adjusting rod 64, and the opening control of the steam control valve 14 by the starting speed control piston 31 is finished, while the speed control governor 32 (speed limiting governor) is finished. The opening degree control of the steam control valve 14 according to 33) is started.

  That is, when the rotational speed of the steam turbine 12 is 50% or more of the rated rotational speed (high rotational speed region), the control device 34 instructs the speed control governor 32 (speed limiting governor 33) to provide a specified rotational speed command value. The speed control governor 32 moves the control rod 62 up and down via the output shaft 60 in accordance with this command value. Then, the speed control governor 32 moves the control rod 62 up and down according to the command value, thereby adjusting the rotation position of the opening adjustment rod 64 by the control rod 62, and the second connecting rod 23 and the first connecting rod. 22, the opening degree of the steam control valve 14 by the valve body 20 is adjusted via the operation rod 21. Accordingly, the valve body 20 of the steam control valve 14 adjusts the communication passage 19 to a predetermined opening speed, thereby adjusting the amount of steam supplied from the boiler 11 to the steam turbine and maintaining the turbine speed at a predetermined specified speed. Thus, the turbine 12 can be operated stably. At this time, the speed control governor 32 detects the rotation speed of the main shaft 54 of the steam turbine 12 via the drive gear 55, the driven gear 56, the driven shaft 58, and the detection rod 52, and the actual turbine rotation speed is detected. Feedback control is performed to achieve the specified rotational speed.

  As described above, in the steam turbine control apparatus of the present embodiment, the steam control valve 14 is provided in the steam pipe 13 for supplying steam from the boiler 11 to the steam turbine 12, and the steam control valve is controlled based on the start command value. A startup speed control piston 31 that increases the opening degree and increases the rotation speed of the steam turbine 12, and a speed control governor 32 that controls the rotation speed of the steam turbine 12 to a specified rotation speed by adjusting the opening degree of the steam control valve 14. The control device 34 switches and controls the start speed control piston 31 and the speed control governor 32 in accordance with the operating state of the steam turbine 12.

  Therefore, when the steam turbine 12 is started, the start speed control piston 31 increases the opening of the steam control valve 14 based on the start command value to control the amount of steam to the steam turbine 12 to increase the turbine speed, Thereafter, when the rotational speed of the steam turbine 12 exceeds a predetermined rotational speed, the speed control governor 32 adjusts the opening degree of the steam control valve 14 to control the rotational speed of the steam turbine 12 to the specified rotational speed. The turbine 12 can be automatically started at a predetermined time, so that the burden on the operator at the time of starting the turbine can be reduced, and a stable turbine starting time can be secured to improve safety.

  Further, in the steam turbine control device of the present embodiment, one end of the opening adjustment rod 64 that is rotatably supported is connected to the valve body 20 of the steam control valve 14, and the opening adjustment rod 64 is pulled. The valve body 20 is urged and supported by the spring 65 in the direction to open the steam passage 17, and the control rod 38 of the start speed control piston 31 presses the other end portion of the opening adjustment rod 64 by the built-in compression spring 37. The steam passage is closed by the valve body 20, and the hydraulic pressure is supplied to the start speed control piston 31, thereby releasing the pressing of the other end portion of the opening adjustment rod 64 by the control rod 38 and the steam passage by the valve body 20. 17 can be opened.

  Therefore, when the steam turbine 12 is stopped, the control rod 38 rotates the opening degree adjusting rod 64 by the compression spring 37 of the start speed control piston 31 to close the steam passage 17 by the valve body 20, and when the steam turbine 12 is started. Then, by supplying hydraulic pressure to the starting speed control piston 31 and releasing the pressing of the opening adjustment rod by the control rod 38, the steam passage 17 is opened by the valve body 20, and with a simple configuration, the turbine can be started. It is possible to automatically adjust the amount of steam and appropriately increase the rotation speed of the steam turbine.

  In the steam turbine control device according to the present embodiment, the needle valve 46 is provided in the first hydraulic pipe that supplies hydraulic pressure to the start speed control piston 31, and the control device 34 opens the opening of the needle valve 46 according to the start command value. Is set. Therefore, when the turbine is started, a predetermined amount of hydraulic pressure can be supplied to the start speed control piston 31 by the opening of the needle valve 46, and steam can be stably supplied when the turbine is started.

  Further, in the steam turbine control device of the present embodiment, the control rod 38 of the start speed control piston 31 is engaged with the opening adjustment rod 64 in the low speed region (0 to 50% of the rated speed) of the steam turbine 12. The control rod 62 of the speed control governor 32 can be engaged with the other end of the opening adjustment rod 64 in the high rotation region of the steam turbine 12 (50 to 100% of the rated rotation speed). Therefore, in the low rotation region of the steam turbine 12, the turbine speed is controlled using the start speed control piston 31, and in the high rotation region of the steam turbine 12, the turbine speed is controlled using the speed control governor 32. By properly switching and using the two speed control means, a stable turbine startup time can be secured and safety can be improved.

  In this case, when the activation speed control piston 31 is used, the engagement between the control rod 62 of the speed control governor 32 and the opening adjustment rod 64 is released, while when the speed control governor 32 is used, the activation speed control piston 31 is disengaged. The engagement between the control rod 38 and the opening adjustment rod 64 is released. Therefore, mutual control does not interfere, and the steam control valve 14 can be appropriately controlled to open and close via the opening adjustment rod 64.

  In the embodiment described above, the steam turbine control device of the present invention has been described as applied to a steam turbine that drives an auxiliary feed water pump in a nuclear power plant, but is applied to a steam turbine used in other plants. Also good.

  The steam turbine control device according to the present invention reduces the burden on the worker at the time of starting the turbine and ensures a stable turbine starting time, and can be applied to any kind of steam turbine. it can.

It is a schematic block diagram showing the control apparatus of the steam turbine which concerns on one Example of this invention. It is sectional drawing showing the engagement relation of the control rod and opening degree adjustment rod of a starting speed control piston in the control apparatus of the steam turbine of a present Example. It is sectional drawing of the steam quantity adjustment valve in the control apparatus of the steam turbine of a present Example.

Explanation of symbols

11 Boiler 12 Steam turbine 13 Steam piping 14 Steam control valve (Steam control valve)
17 Steam passage 19 Communication passage 20 Valve element 31 Start speed control piston (first speed control means)
32 Speed control governor (second speed control means)
33 Speed limiting governor (second speed control means)
37 Compression spring 38 Control rod 44 First hydraulic piping 45 Hydraulic pump 46 Needle valve (flow adjustment valve)
62, 63 Control rod 64 Opening adjustment rod 65 Tension spring

Claims (5)

  A steam control valve provided in a steam passage for supplying steam to the steam turbine, and a first control for increasing the rotation speed of the steam turbine by increasing the opening of the steam control valve based on a start command value. Speed control means, second speed control means for controlling the rotational speed of the steam turbine to a predetermined rotational speed by adjusting the opening of the steam quantity control valve, and the steam quantity adjustment according to the operating state of the steam turbine. A control device for a steam turbine, comprising: control means for switching the speed control means for adjusting the opening of the valve.   2. The steam turbine control device according to claim 1, wherein the steam amount adjusting valve has a valve body capable of opening and closing the steam passage, and one end portion of an opening adjusting rod supported rotatably is the valve. The opening adjustment rod is urged and supported in a direction in which the valve body opens the steam passage, and the hydraulic piston as the first speed adjusting means is connected to the body in accordance with the supply hydraulic pressure. The steam turbine control device, wherein the steam passage can be closed by the valve body by pressing the other end of the adjusting rod.   3. The steam turbine control device according to claim 2, wherein the hydraulic piston is capable of closing the steam passage by the valve body by pressing the other end of the opening adjustment rod with a built-in compression spring. 4. An apparatus for controlling a steam turbine, wherein the steam passage can be opened by the valve body by releasing the pressure applied to the other end of the opening adjustment rod by supplying hydraulic pressure to the hydraulic piston.   The steam turbine control device according to claim 3, wherein a flow rate adjusting valve is provided in a hydraulic pipe that supplies hydraulic pressure to the hydraulic piston, and the control means controls an opening degree of the flow rate adjusting valve according to an activation command value. A control device for a steam turbine, wherein the control device is set.   2. The steam turbine control device according to claim 1, wherein the steam amount adjusting valve has a valve body capable of opening and closing the steam passage, and one end portion of an opening adjusting rod supported rotatably is the valve. And the opening adjustment rod is biased and supported in a direction in which the valve body opens the steam passage, and the control rod of the first speed control means is opened in the low rotation region of the steam turbine. It is engageable with the other end of the degree adjusting rod, and the control rod of the second speed adjusting means can be engaged with the other end of the opening adjusting rod in the high rotation region of the steam turbine. Steam turbine control device.

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