JP2002276305A - Steam turbine apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam turbine apparatus, in which a protection device that has been operated can be detected, without disposing additional devices to each protection device. SOLUTION: The steam turbine apparatus 2, unlike the prior art, utilizing a status signal generating portion 5 and an over-speed signal transmitting device 4 receiving a rotational speed signal S95 and outputting an over-speed signal S4 that becomes high voltage when the rotational speed of a turbine axel 92 exceeds a limit value. The status signal generating portion 5 receives a low oil pressure signal S7 of low pressure oil for emergency stop, an over-speed signal S4, a low oil pressure signal S84 of lubricating oil pressure, and an electrical signal S62. By combining these signals to perform logical processing, the status signal generating portion 5 generates a status signal S73 on over-speed trip, a status signal S74 on thrust abrasion trip, a status signal S75 on low pressure trip of lubricating oil, and a status signal S83 on operation of electric protection device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam turbine device having a security device which operates when an abnormality occurs, and which can detect a security device which has been operated without providing an additional device in each security device. Regarding the configuration.

[0002]

2. Description of the Related Art A steam turbine device is a rotary mechanical device that converts kinetic energy of steam into useful power, and is widely used as a prime mover used for driving a relatively large rotary load device such as a generator. Have been. This type of steam turbine device generally includes a security device that operates when an abnormality occurs. A conventional steam turbine device provided with a security device will be described below with reference to FIG. Here, FIG.
FIG. 2 is an explanatory view showing a conventional steam turbine device provided with a security device together with related devices. In FIG. 6, the turbine main body is schematically illustrated, the safety device and the oil circuit are illustrated as a hydraulic circuit diagram, the electric signal lines are illustrated as a connection diagram drawn by dotted lines, and the generator as a related device is indicated by an abbreviation. I have. The same applies to FIGS. 1 and 4 described later.

A conventional steam turbine apparatus 9 shown in FIG.
Is a turbine main body 91, a main steam supply system 96, a lubricating oil supply system 8, a low pressure emergency stop oil circuit 7, a high pressure emergency stop oil circuit 6, an emergency shutoff valve 72, an emergency governor 73, and a thrust protection device 74. , A lubricating oil pressure drop trip device 75, a solenoid trip device 83, a pressure responsive signal transmission device 77,
84, a display device 65, a limit switch 63, and an electric signal transmitting device (not shown). Reference numeral 66 denotes a generator driven by the turbine main body 91, which is a related device in this case.

[0004] The turbine body 91 includes a turbine axle 92 to which a power generator (not shown) for generating power when supplied with the main steam 99 is mounted, bearings 93 rotatably supporting the turbine axle 92, and a turbine 93. A gear 94 mounted on the axle 92, and a rotation speed signal S9 disposed in combination with the gear 94 and corresponding to the rotation speed of the turbine axle 92
Rotation speed transmission device for transmitting 5 (electromagnetic pickup, etc.)
95. The main steam supply system 96 includes the turbine body 9
1 has a main passage 99 for supplying main steam 99, and a main steam stop valve 97 and a steam control valve 98 disposed in the main passage. The high-pressure emergency stop oil circuit section 6 has a pipeline 61 for filling the high-pressure emergency stop oil 69. When the hydraulic pressure of the high-pressure emergency stop oil 69 in the pipeline 61 decreases due to the operation of the emergency shutoff valve 72 or the like, the main steam stop is performed. The valve 97 and the steam control valve 98 are closed, and the turbine main body 91 is emergency stopped.

The low-pressure emergency stop oil circuit section 7 has a pipe line 71 for filling a low-pressure emergency stop oil 79. The emergency shut-off valve 72 is connected to the pipeline 71 and operates when the hydraulic pressure of the low-pressure emergency stop oil 79 decreases, discharges the high-pressure emergency stop oil 69 in the pipeline 61 to lower the hydraulic pressure of the high-pressure emergency stop oil, and Main unit 91
To perform the security operation. Further, an emergency governor 73, a thrust protection device 74, a lubricating oil pressure drop trip device 75, and a pressure-responsive signal transmission device (such as a pressure switch) 77 are provided in the pipeline 71. The emergency governor 73 operates when the rotation speed of the turbine axle 92 exceeds the limit value, and discharges the low-pressure emergency stop oil 79 in the pipeline 71 to lower the low-pressure emergency stop oil pressure. The emergency governor 73 moves its attached lever in accordance with its operation and non-operation. Therefore, the movement state of this lever is detected by the limit switch 63 attached to the emergency governor 73, and the detection signal S73X
Output. This detection signal S73X is transmitted to the emergency governor 73.
, Which is sent to the display device 65.

When a thrust bearing (not shown) incorporated in the bearing 93 is worn, the turbine axle 92 moves in the axial direction. When this movement amount exceeds the limit value, the thrust protection device 74 operates to discharge the low-pressure emergency stop oil 79 in the pipeline 71. The operating state of the thrust protection device 74 is detected by the limit switch 63 attached to the thrust protection device 74, output as a detection signal S74X, and sent to the display device 65 as in the case of the emergency governor 73.

The lubricating oil pressure drop trip device 75 operates when the oil pressure of the lubricating oil 89 in the pipe line 82 described below falls below a specified value, and discharges the low-pressure emergency stop oil 79 in the pipe line 71. The operating state of the lubricating oil pressure drop trip device 75 is the same as that of the emergency governor 73.
The detection is detected by the limit switch 63 attached to the controller, output as a detection signal S75X, and sent to the display device 65. The emergency governor 73, the thrust protection device 74, and the lubricating oil pressure drop trip device 75 are collectively referred to as a mechanical security device. When one of the mechanical security devices operates, the low-pressure emergency device is operated as described above. The stop hydraulic pressure decreases. The oil pressure state of the low-pressure emergency stop oil pressure is detected by the pressure-responsive signal transmission device 77, and the oil pressure drop signal S of the low-pressure emergency stop oil pressure is detected.
It is output as 77 and sent to the display device 65.

The lubricating oil supply system 8 has a main oil pump 81 for pressurizing a lubricating oil 89 for lubricating the bearing 93 and a piping 82 for the lubricating oil 89. The pipe line 82 supplies the lubricating oil 89 pressurized by the main oil pump 81 to the bearing 93, and branches off from the main line to the low-pressure emergency stop oil circuit 7 for the low-pressure emergency stop oil 79. It has a branch pipe section for supplying the lubricating oil 89. A pressure-responsive signal transmission device (such as a pressure switch) 84 is provided in the main conduit of the conduit 82.
A solenoid trip device 83 and a throttle body 85 are connected to the branch pipe section from the side closer to the main pipe section, and this branch pipe section is connected to the pipe 71 via a lubricating oil pressure drop trip device 75 at the end of the throttle body 85. It is connected. Lubricating oil 89 in the main pipeline
When the oil pressure drop occurs, the lubrication oil pressure drop trip device 75
As a result, the security operation is performed, and the oil pressure state of the lubricating oil 89 is detected by the pressure-responsive signal transmitting device 84, output as a lubricating oil pressure lowering signal S84, and sent to the display device 65.

The solenoid trip device 83, which is an electric security device, is a kind of solenoid valve (three-way valve), and is an electric signal transmission device (a pressure that is used to detect an abnormality when an abnormality occurs and transmits an electric signal). A device such as a switch is used to detect a rise in the main steam 99 exceeding a specified value of the pressure or temperature, or a rise in the main steam 99 exceeding a specified value of the pressure of the exhaust (not shown) from the turbine body 91). The received electrical signal S62 is input. When the steam turbine device 9 operates normally, the solenoid trip device 83
9 is supplied to the branch pipe section after the solenoid trip device 83 and the low-pressure emergency stop oil circuit section 7. When the electric signal S62 indicates an abnormal state of the steam turbine device 9 indicating an abnormal state, the passage of the lubricating oil 89 from the main line to the branch line is blocked, and the inside of the branch line after the solenoid trip device 83. Of the lubricating oil 89 from the branch pipe portion, and the safety operation of discharging the low-pressure emergency stop oil 79 in the pipe line 71 through the path through the lubricating oil pressure drop trip device 75 and the throttle body 85.

In the case of the steam turbine device 9 of this case, the low-pressure emergency stop oil 7 of the solenoid trip device 83 is used.
Since the area of the passage for discharging 9 is small, there is a limit in the oil discharging capacity. Therefore, in order to increase the discharge capacity of the low-pressure emergency stop oil 79 during the safety operation of the solenoid trip device 83, the lubrication oil pressure drop trip device 75 is operated by the oil pressure drop due to the operation of the solenoid trip device 83, and the lubrication oil pressure drop trip device 75 Also low pressure emergency stop oil 79
Is to be discharged. This realizes a rapid drop in the hydraulic pressure of the low-pressure emergency stop oil 79 during the safety operation of the solenoid trip device 83. When the oil pressure of the low-pressure emergency stop oil 79 in the pipe line 71 decreases due to the safety operation of the security device (general term of the mechanical security device and the electrical security device (solenoid trip device 83)), the oil pressure decreases. Is provided so as not to affect the oil pressure value of the lubricating oil 89.

A detection signal (such as S73X) transmitted from the limit switch 63 in accordance with the operation state of the mechanical security device, a hydraulic pressure reduction signal S77, S84 transmitted from the pressure-responsive signal transmission device 77, 84, and an electric signal The electric signal S62 transmitted by the transmitting device is received by the display device 65. When the display device 65 is, for example, a display lamp type, a display lamp corresponding to the reception of each signal is turned on. When the display device 65 is, for example, a display device 65 using a monitor device, each display signal is received. A corresponding error message is displayed on the monitor screen. The display device 65 also receives the rotation speed signal S95 transmitted from the rotation speed transmission device 95, and displays the rotation speed of the turbine body 91.

The safety operation of the mechanical protection device such as the emergency governor 73 and the safety operation of the solenoid trip device 83 accompanying the detection of an abnormality of the electric signal transmission device are performed by the low-pressure emergency stop oil 79. Reduce hydraulic pressure. The emergency shut-off valve 72 is operated as described above by the decrease in the oil pressure of the low-pressure emergency stop oil 79, and the turbine main body 91 is emergency-stopped. The steam turbine device 9 in which the turbine main body 91 has been emergency-stopped in such a manner is subjected to restoration treatment for an abnormal part. Then, the lubricating oil 89 is
Is filled from the branch pipe portion of the pipe line 82 through the solenoid trip device 83, the throttle body 85, and the lubricating oil pressure drop trip device 75, and the oil pressure of the low-pressure emergency stop oil 79 is restored to the specified value. When the emergency shut-off valve 72 returns to the normal operation state by the recovery of the low-pressure emergency stop oil pressure, the line 61 of the high-pressure emergency stop oil circuit 6 is filled with the high-pressure emergency stop oil 69 from the high-pressure emergency stop oil supply circuit (not shown). The restriction on the closed state of the steam stop valve 97 and the steam control valve 98 is released. And then
As the steam turbine device 9 is brought into an operable state by the above-described restoration work, all the security devices and the like return to a normal (returned) state.

As a result, each detection signal [a detection signal (such as S73X) transmitted from each limit switch 63, a hydraulic pressure reduction signal (such as S77) transmitted from the pressure-responsive signal transmitting devices 77 and 84, and an electrical signal] All of the electrical signals S62 transmitted from the signal transmitting device are in a normal (recovery) state, and the abnormal display disappears from the display device 65. Thereby, the operation of the steam turbine device 9 is restarted. Each detection signal is a signal indicating an abnormal state of a high voltage (for example, a DC voltage of about 24 V to about 220 V DC) when an abnormality is detected, and the detection signal in the high voltage state is to directly operate an electromagnetic valve or the like. Can be
Generally, a signal indicating a normal (recovery) state of zero voltage (including the ground potential) is obtained at the time of normal (recovery).

[0014]

In the above-described steam turbine device 9 according to the prior art, it is possible to easily confirm the security device that has operated when an abnormality has occurred by the display on the display device, and to perform the recovery work accurately. Has been made. However, in recent years, the following has become a problem, and its solution has been desired. That is, (1) It is necessary to attach a limit switch 63 to each mechanical security device (such as the emergency governor 73) in order to detect each security device operated when an abnormality occurs. Further, in order to attach the limit switch 63 to the mechanical security device, a mount (not shown) for attachment is required. Therefore, the detection of the operation of each mechanical security device requires a gantry together with the limit switch 63, which requires an extra large installation space, which is a major obstacle to miniaturization efforts of the security device. Has become.

(2) Further, in the case of a comparatively small capacity steam turbine device of another conventional example, the display system is simplified as described below. That is, in this case, the display device 65 and the limit switch 63 are not provided, and the detection signal (S77 or the like) of the pressure-responsive signal transmission device (the pressure switch 77 or the like) is input to the electric safety device (the solenoid trip device 83). The rotation speed signal S95 transmitted from the rotation speed transmission device 95 is used as a display input of the rotation speed meter. The detection of each mechanical security device that has operated when an abnormality has occurred is performed by visually observing the movement position of a lever attached to the mechanical security device. In some cases, improvement of the display system is examined for an existing steam turbine device having such a simplified display system, but there is no space for mounting the limit switch 63 around each mechanical security device. In most cases, the display system is not improved.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a steam system which can detect a security device operated without providing an additional device (such as a limit switch) in each security device. An object of the present invention is to provide a turbine device.

[0017]

SUMMARY OF THE INVENTION According to the present invention, there are provided the following objects: 1) a lubricating oil for lubricating a turbine body having a turbine axle that rotates by power obtained from steam, and a bearing that rotatably supports the turbine axle. A low-pressure emergency stop oil used at the time of an emergency stop of the turbine main body when an abnormality occurs, a plurality of safety devices that operate at the time of the occurrence of the abnormality and lower the oil pressure of the low-pressure emergency stop oil, and a normal state when the safety device is not operating A plurality of signal transmission devices that individually transmit detection signals having two types of abnormal states when the abnormality occurs, and a logic process performed by combining a plurality of the detection signals to operate each of the security devices. A state signal generation unit for determining a state and generating a state signal corresponding to each of these operation states; or 2) the means described in the above item 1; In the plurality of detection signals used in combination when the state signal generating unit generates the state signal, a hydraulic pressure decrease signal of the low-pressure emergency stop oil is commonly used for all generated state signals. Or 3) In the means described in the above item 1 or 2, the signal transmission device individually transmits a hydraulic pressure decrease signal which is the detection signal of the hydraulic state of the lubricating oil and the low-pressure emergency stop oil. A pressure-responsive signal transmission device, an overspeed signal transmission device that transmits an overspeed signal that is a detection signal of an overspeed condition of the turbine axle, and an electrical signal that is a detection signal that enters the abnormal state when the abnormality occurs 4) In the means described in the above item 3, the state signal generating unit may determine whether or not the turbine axle has overspeed protection by the low-pressure emergency stop. Wherein the oil pressure signal from an oil AND the overspeed signal
A condition signal corresponding to the overspeed protection state of the turbine axle is generated by judging according to the condition, and the presence or absence of excessive movement protection in the axial direction of the turbine axle is determined by the overspeed signal, the oil pressure decrease signal of the lubricating oil and the electric signal. A distinction is made between the respective NOT conditions of the dynamic signal and the AND condition of the low oil pressure signal of the low-pressure emergency stop oil, and a state signal corresponding to the excessive movement protection state in the axial direction of the turbine axle is generated. The presence or absence of the occurrence is determined by an AND condition between the low-pressure emergency stop oil hydraulic pressure lowering signal and the lubricating oil hydraulic pressure lowering signal, and a state signal corresponding to the lubricating oil hydraulic pressure lowering protection state is generated. The operation status of the safety device that discharges the low-pressure emergency stop oil is determined by the AND condition between the low-pressure emergency stop oil oil pressure drop signal and the electrical signal. Generating a corresponding state signal additionally or, 5) in the means described in the item 3, wherein the operation display signal generating section, the presence or absence of overspeed protection generation of the turbine axle,
An overspeed protection state of the turbine axle is determined by determining an AND condition between the NOT condition of the lubricating oil pressure drop signal and the electrical signal, the low pressure emergency stop oil pressure drop signal, and the overspeed signal. Generate a corresponding status signal,
Judgment of the occurrence of excessive movement protection in the axial direction of the turbine axle is determined by the AND condition of the NOT condition of each of the overspeed signal, the oil pressure decrease signal of the lubricating oil and the electrical signal, and the oil pressure decrease signal of the low pressure emergency stop oil. To generate a state signal corresponding to the protection state of excessive movement in the axial direction of the turbine axle, and to determine whether or not lubrication oil pressure drop protection has occurred, to determine the respective NOT conditions of the overspeed signal and the electric signal, and to perform a low pressure emergency stop. A determination is made based on an AND condition between the oil pressure lowering signal of the oil and the oil pressure lowering signal of the lubricating oil to generate a state signal corresponding to the oil pressure lowering protection state of the lubricating oil, and the low pressure emergency stop oil is discharged in response to the electric signal. Check whether the security device that performs the
AND of low-pressure emergency stop oil oil pressure drop signal and electrical signal
This is achieved by generating a state signal corresponding to the operating state of the security device, determined by a condition.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, the same portions as those of the conventional steam turbine device shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. In addition, in the drawings used in the following description, only reference numerals shown in FIG. 6 are represented as much as possible. FIG. 1 is an explanatory view showing a steam turbine device according to an embodiment of the present invention together with related devices, FIG. 2 is a flowchart showing a state signal generator of FIG. 1, and FIG. 3 is an overspeed signal transmitting device of FIG. FIG. 1 to 3, reference numeral 1 denotes a state in which the state signal generating unit 3 and the overspeed signal transmitting device 4 are used and the limit switch 63 is not used in the steam turbine device 9 according to the conventional example shown in FIG. 6. It is a steam turbine device.

As shown in FIG. 3, the overspeed signal transmission device 4 has a comparator 41 and a reference voltage source 42 which are well known in the field of electric circuit technology, inputs a rotation speed signal S95, and controls the rotation speed of the turbine axle 92. This is a circuit device that outputs an overspeed signal S4 that becomes a high voltage when a limit value is exceeded. When the rotation speed transmitting device 95 is an electromagnetic pickup, the rotation speed signal S95 transmitted from the rotation speed transmitting device 95 is an alternating current, so that the rotation speed signal S95 when applied to the overspeed signal transmitting device 4 is obtained by an appropriate method. It is supplied to the overspeed signal transmitting device 4 after being converted to a direct current. Note that a device that converts the rotation speed signal S95 into a direct current may be incorporated in the overspeed signal transmission device 4.

The reference voltage source 42 is a circuit device that generates a reference voltage V _C having a DC voltage value corresponding to the rotation speed limit value of the turbine axle 92. The comparator 41 has a reference voltage V _C at an inverting input terminal and a rotation speed signal S at a non-inverting input terminal.
If the value of the rotation speed signal S95 is equal to or less than the reference voltage V _C , a DC voltage of zero voltage (earth potential) is output from the output terminal. Then the comparator 41 when the value of the speed signal S95 exceeds the reference voltage V _C, namely the rotational speed of the turbine axle 92 exceeds the limit value, and outputs the DC voltage of the high voltage from the output terminal. This DC voltage output from the comparator 41 is the overspeed signal S4
It is.

As shown in FIG. 2, the state signal generator 3 generates a low pressure emergency stop hydraulic pressure decrease signal S77, an overspeed signal S4,
Lubricating oil pressure drop signal S84 and electrical signal S62
Are input and logical processing is performed by combining these signals, whereby the state signal S73, the state signal S74, and the state signal S
75 and a state signal S83. State signal S73
6 is a signal related to the operation state of the emergency governor 73, and FIG.
In the related art, the detection signal S73X of the limit switch 63 attached to the emergency governor 73.
An overspeed signal S4 can detect an increase in the rotation speed of the turbine axle 92 that exceeds the limit value. However, if the emergency governor 73 operates, a decrease in the oil pressure of the low-pressure emergency stop oil 79 necessarily occurs. By confirming that both of the oil pressure decrease signals S77 are in an abnormal state, the accuracy of the operation determination of the emergency governor 73 is increased. That is, the state signal generator 3 determines the AND condition between the overspeed signal S4 and the oil pressure decrease signal S77, and determines the state signal S corresponding to the operation state of the emergency governor 73.
73 is generated. The state signal S73 is a DC voltage, and becomes a high voltage when the emergency governor 73 operates, and becomes a zero voltage when the emergency governor 73 is normal (recovery).

The state signal S75 is a signal relating to the operation state of the lubricating oil pressure lowering trip device 75, and corresponds to the detection signal S75X of the limit switch 63 attached to the lubricating oil pressure lowering trip device 75 in the conventional example shown in FIG. A decrease in the oil pressure of the lubricating oil 89 in the pipeline 82 below a specified value can be detected by an oil pressure decrease signal S84 from the pressure-responsive signal transmission device 84. However, in the state signal generating section 3, the lubrication oil pressure drop trip device 75 is activated. Low pressure emergency stop oil 79
By using the fact that the oil pressure drop always occurs, the accuracy of the operation judgment of the lubricating oil pressure drop trip device 75 is increased. That is, the state signal generator 3 determines the AND condition of the oil pressure lowering signal S84 and the oil pressure lowering signal S77, and generates a state signal S75 corresponding to the operating state of the lubricating oil pressure lowering trip device 75. The state signal S75 is a DC voltage, and becomes a high voltage when the lubricating oil pressure lowering trip device 75 operates, and becomes a zero voltage when the lubricating oil pressure lowering trip device 75 is normal (return).

The state signal S83 is a signal relating to the operation state of the electric security device (solenoid trip device 83). The solenoid trip device 83 receives the electric signal S62 transmitted from the electric signal transmitting device, and operates so as to reduce the oil pressure of the low-pressure emergency stop oil 79 in an abnormal state where the electric signal S62 becomes a high voltage. The state signal generator 3 confirms that both the electric signal S62 and the oil pressure decrease signal S77 are in an abnormal state, thereby increasing the accuracy of the operation determination of the solenoid trip device 83. That is, the state signal generator 3 determines the AND condition of the electric signal S62 and the oil pressure decrease signal S77, and generates the state signal S83 corresponding to the operation state of the solenoid trip device 83. The state signal S83 is a DC voltage, and becomes a high voltage when the solenoid trip device 83 operates, and becomes a zero voltage when the solenoid trip device 83 is normal (recovery).

The state signal S74 is output from the thrust protection device 7
4, which corresponds to the detection signal S74X of the limit switch 63 attached to the thrust protection device 74 in the conventional example shown in FIG. The state signal generation unit 3 determines whether the thrust protection device 74 is in the operating state, not by directly confirming the operation state of the thrust protection device 74, but by using a security device (emergency speed control) excluding the thrust protection device 74. The machine 73, the lubricating oil pressure drop trip device 75, and the solenoid trip device 83) do not operate but the oil pressure of the low-pressure emergency stop oil 79 is reduced. That is, the state signal generator 3 determines the respective NOT conditions of the overspeed signal S4, the oil pressure decrease signal S84 and the electric signal S62, and the oil pressure decrease signal S
77 and the thrust protection device 7
A state signal S74 corresponding to the operation state of No. 4 is generated. The state signal S74 is a DC voltage, and becomes a high voltage when the thrust protection device 74 operates, and becomes a zero voltage when the thrust protection device 74 is normal (recovery).

As with the steam turbine device 9 according to the conventional example, the hydraulic pressure of the low-pressure emergency stop oil 79 is always reduced regardless of which security device operates. The inventor pays attention to this, and uses a common oil pressure drop signal S77 for all the generated state signals for a plurality of the detection signals used in combination when generating all the state signals. . Then, an AND condition between the oil pressure decrease signal S77 and another signal is taken, and by confirming that both the other signal and the oil pressure decrease signal S77 are in an abnormal state, the accuracy of the operation determination of each security device can be improved. I try to raise it. Also, while any one of the safety devices is operating, the hydraulic pressure of the low-pressure emergency stop oil 79 is maintained in a reduced state,
The return of the oil pressure decrease signal S77 to the normal state means that the abnormal part that caused the emergency stop of the turbine main body 91 has been recovered. Therefore, the common use of the hydraulic pressure decrease signal S77 for generating each state signal is equivalent to the hydraulic pressure decrease signal S77.
The state signal can be returned to zero voltage indicating that the security device is normal (recovery) only by returning to the normal state at 77.

The state signal generator 3 and the overspeed signal transmitter 4 can be manufactured as so-called hardware combining logic elements, or as so-called software. In the latter case, when an electronic computer (not shown) is used for controlling the steam turbine device 1 or the like, it may be incorporated in a part of software for the electronic computer. The display input to the display device 65 of the steam turbine device 1 is generated by the state signal generation unit 3 in place of the signal transmitted by the limit switch 63 in response to the display input to the display device 65 of the conventional steam turbine device 9. The difference is that the state signal is input.

The display method for each of the status signals output from the status signal generator 3 on the display device 65 is as follows.
Basically equivalent to the case of the steam turbine device 9,
An example of the display contents is as follows. That is, when the respective status signals are abnormal, the status signal S73 is overspeed trip (emergency governor operation) and the status signal S73
74 is a thrust wear trip (operation of the thrust protection device), the status signal S75 is a lubrication oil pressure drop trip (operation of the lubrication oil pressure drop trip device), and the status signal S83 is an electric safety device operation (solenoid trip device operation). is there.

Since the steam turbine device 1 according to the embodiment of the present invention shown in FIGS. 1 to 3 has the above-described configuration, the mechanical security device can be used without attaching an additional device such as a limit switch to the security device. And a state signal corresponding to each operation state of the electric security device can be obtained. This eliminates the need for mounts for mounting limit switches. As a result, regarding efforts to downsize security devices,
It is possible to eliminate a hindrance caused by mounting the limit switch, which has occurred in the case of the conventional example. Further, if the present invention is applied to the existing steam turbine device described in the item (2) of the “problem to be solved by the invention”, it is not necessary to add a new detection device including a limit switch. Further, it is possible to easily improve the display system such as displaying the operation state of the security device on the display device at a time.

Next, a steam turbine device according to another embodiment of the present invention will be described with reference to FIGS.
FIG. 4 is an explanatory diagram showing a steam turbine device according to a different example of the embodiment of the present invention together with related devices, and FIG. 5 is a flowchart showing a state signal generating unit shown in FIG.
In the following description, the same parts as those of the steam turbine device of the present invention shown in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof will be omitted. 4 and 5, reference numeral 2 denotes FIGS.
This is a steam turbine device in which a state signal generator 5 is used instead of the state signal generator 3 in the steam turbine device 1 of the present invention shown in FIG. As shown in FIG. 5, the input detection signal and the output status signal of the status signal generator 5 are the same as those of the status signal generator 3.

The contents different from the state signal generator 3 of the state signal generator 5 are the state signal S73 and the state signal S7.
5 is a logic processing method related to an input signal for obtaining the fifth signal.
Then, for the state signal S73, the state signal generation unit 5 determines based on the respective NOT conditions of the oil pressure decrease signal S84 and the electric signal S62, and the AND condition of the oil pressure decrease signal S77 and the overspeed signal S4. A state signal S73 is generated. The state signal generator 5 determines the state signal S75 based on the respective NOT conditions of the overspeed signal S4 and the electric signal S62, and the AND conditions of the oil pressure decrease signal S77 and the oil pressure decrease signal S84. S75
Generate

That is, the state signal generator 5 is different from the state signal generator 3 in that a NOT condition is added when the state signals S73 and S75 are generated. Here, taking an example of the relationship between the overspeed signal S4 and the oil pressure decrease signal (corresponding to the decrease in lubricating oil pressure) S84 at the time of generation of the state signal S73, the advantage obtained by adding the NOT condition in the state signal generation unit 5 will be described. explain. When lubrication oil pressure drops,
In the case of a steam turbine device that drives the generator 66 having a relatively large capacity, it is general that a load shedding procedure for the generator 66 is performed simultaneously with an emergency stop procedure for the turbine body 91. In such a case, since the time required for interrupting the load of the generator 66 is shorter than the time required for the emergency stop of the turbine body 91, the turbine body 91 temporarily becomes lightly loaded during the emergency stop procedure. Overspeed.

The state signal generating section 5 sets the condition for generating the state signal S73 to be equal to the N of the oil pressure decrease signal S84 in order to prevent such an erroneous determination due to the accompanying abnormal phenomenon.
The accuracy of signal discrimination is improved by adding an OT condition. The relationship between the overspeed signal S4 and the electrical signal S62 when the state signal S73 is generated, the relationship between the oil pressure reduction signal S84 and the overspeed signal S4 when the state signal S75 is generated, and the electrical relationship between the oil pressure reduction signal S84 and the electrical signal S84. The relationship with the signal S62 is also
Although detailed description is omitted to avoid duplication, the overspeed signal S4 and the oil pressure decrease signal S84 at the time of generation of the state signal S73 are described.
This is for the purpose of improving the accuracy of signal discrimination at the time of generating the state signal, as in the case of The steam turbine device 2 according to the different embodiment of the present invention shown in FIGS. 4 and 5 has the above-described configuration. Therefore, in addition to the actions and effects of the steam turbine device 1 according to the present invention, when the state signal is generated, This has the advantage that the accuracy of signal discrimination is improved.

In the above description, the state signals generated by the state signal generators 3 and 5 and the detection signals input to the state signal generators 3 and 5 are DC high voltages (for example, 24 V to D).
It has been described that an abnormal state is indicated at about C220V, and a normal (recovery) state is indicated at DC zero voltage. However, the present invention is not limited to this, and the state signal and the detection signal can be reliably distinguished from the abnormal state and the normal state. If possible, those voltage values may be appropriate values. In the above description, the state signal generated by the state signal generators 3 and 5 and the detection signal input to the state signal generators 3 and 5 are DC voltages, but are not limited to this. Instead, for example, some or all of the signals may be light signals. By using a light signal as the signal, noise resistance and the like can be improved. When a light signal is used for the state signal generators 3 and 5, the presence or absence of a light signal, the intensity of the light signal, and the light frequency (including color) are classified into a normal state and an abnormal state.
Can be used.

[0034]

According to the steam turbine device of the present invention,
The following effects can be obtained by adopting the configuration described in the section of means for solving the above problems. By adopting a configuration according to the first to fourth aspects of the present invention, an additional device such as a limit switch is provided for a state signal corresponding to an operation state of the security device. As a result, a frame for mounting the limit switch can be omitted. As a result, it is possible to eliminate the obstructive factor associated with the mounting of the additional device, which has occurred in the case of the conventional example, with respect to the miniaturization of the security device. In addition, it is possible to improve the display system such as displaying the operation state of the security device with respect to the existing steam turbine device on the display device at a time. In addition, by adopting the configuration according to the first to third aspects of the means for solving the above problems, it is possible to generate the state signal while maintaining the effect of the first item. The accuracy of signal discrimination at the time can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a steam turbine device according to an embodiment of the present invention together with related devices.

FIG. 2 is a flowchart illustrating a state signal generator according to FIG. 1;

FIG. 3 is an electric circuit diagram showing the overspeed signal transmission device according to FIG. 1;

FIG. 4 is an explanatory diagram showing a steam turbine device according to another example of the embodiment of the present invention together with related devices.

FIG. 5 is a flowchart illustrating a state signal generator according to FIG. 4;

FIG. 6 is an explanatory view showing a conventional steam turbine device together with related devices.

[Explanation of symbols]

 2 Steam turbine device 4 Overspeed signal transmission device 5 State signal generator 92 Turbine axle

Claims (5)

[Claims] 1. A turbine body having a turbine axle rotated by power obtained from steam, a lubricating oil for lubricating a bearing for rotatably supporting the turbine axle, and an emergency stop of the turbine body when an abnormality occurs. A low-pressure emergency stop oil, a plurality of security devices that operate when the abnormality occurs and lower the oil pressure of the low-pressure emergency stop oil, and two types of states: a normal state when the security device is not operating, and an abnormal state when the abnormality occurs. A plurality of signal transmission devices for individually transmitting detection signals possessed, and a plurality of the detection signals are combined to perform a logical process to determine an operation state of each of the security devices, and to correspond to each of these operation states. And a status signal generation unit that generates a status signal to be generated. 2. The steam turbine device according to claim 1, wherein the state signal generation unit includes a plurality of the detection signals used in combination when generating the state signal, and a state signal generation unit for all the generated state signals. A steam turbine apparatus wherein a common oil pressure decrease signal of the low-pressure emergency stop oil is used. 3. The steam turbine device according to claim 1, wherein the signal transmission device individually transmits a hydraulic pressure reduction signal that is the detection signal of a hydraulic state of the lubricating oil and the low-pressure emergency stop oil. A pressure-responsive signal transmitter,
An overspeed signal transmitting device that transmits an overspeed signal that is a detection signal of an overspeed condition of the turbine axle, and an electrical signal transmitting device that transmits an electrical signal that is a detection signal that becomes the abnormal state when the abnormality occurs. A steam turbine device comprising: 4. The steam turbine device according to claim 3, wherein the state signal generating unit determines whether or not the overspeed protection of the turbine axle has occurred by comparing the low pressure emergency stop oil oil pressure drop signal and the overspeed signal. A state signal corresponding to the overspeed protection state of the turbine axle is generated by determining the condition based on the AND condition, and the presence / absence of overtravel protection in the axial direction of the turbine axle is determined by the overspeed signal, the oil pressure drop signal of the lubricating oil, A determination is made based on an AND condition between the respective NOT conditions of the electric signal and the hydraulic pressure reduction signal of the low-pressure emergency stop oil to generate a state signal corresponding to a protection state of excessive movement of the turbine axle in the axial direction, thereby reducing the lubricating oil pressure. Whether or not protection has occurred is determined based on an AND condition between the low pressure signal of the low pressure emergency stop oil and the low pressure signal of the lubricating oil, and a state signal corresponding to the low oil pressure protection state of the lubricating oil is generated. The operation state of the safety device that performs the operation of discharging the low-pressure emergency stop oil in response to the signal is determined based on the AND condition between the low-pressure emergency stop oil oil pressure drop signal and the electrical signal. A steam turbine device that generates a status signal corresponding to 5. The steam turbine device according to claim 3, wherein the operation display signal generation unit determines whether or not the overspeed protection of the turbine axle has occurred, by using each of the lubricating oil pressure decrease signal and the electric signal. And a state signal corresponding to an overspeed protection state of the turbine axle is determined by determining an AND condition of the NOT condition, the oil pressure drop signal of the low-pressure emergency stop oil, and the overspeed signal, and the axial direction of the turbine axle is determined. The presence or absence of excessive movement protection to the turbine axle is determined based on the AND condition of the NOT condition of each of the overspeed signal, the oil pressure decrease signal of the lubricating oil and the electrical signal, and the oil pressure decrease signal of the low pressure emergency stop oil. Generates a state signal corresponding to the over-travel protection state in the long direction, and determines whether or not lubrication oil pressure drop protection has occurred.
NOT conditions of the overspeed signal and the electric signal,
A determination is made based on an AND condition between the low-pressure emergency stop oil hydraulic pressure lowering signal and the lubricating oil hydraulic pressure lowering signal to generate a state signal corresponding to the lubricating oil hydraulic pressure lowering protection state. A state signal corresponding to the operation state of the safety device is generated by judging whether or not the operation state of the safety device performing the operation of discharging the oil has occurred, based on an AND condition between the hydraulic pressure drop signal of the low-pressure emergency stop oil and the electric signal. A steam turbine device characterized by: