CN117703539A - Turbine speed regulating system of steam turbine generator unit and power regulating method thereof - Google Patents
Turbine speed regulating system of steam turbine generator unit and power regulating method thereof Download PDFInfo
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Abstract
The application provides a turbine speed regulating system of a turbine generator unit and a power regulating method thereof. The electric servo adjusting mechanism comprises a cam, a ball screw and a servo motor. The cam is connected with a feedback sleeve in the hydraulic servo actuating mechanism, and the ball screw is connected with the high-pressure regulating door. When the power fluctuation of the turbo generator set exceeds the set value deviation, the length of the telescopic rod on the ball screw is controlled by the servo motor, the telescopic rod acts on the feedback sleeve through the cam, and the telescopic rod is matched with the wrong throttle slide valve to control the oil inlet and discharge amount of the piston chamber of the oil engine, so that the high-voltage regulating gate is driven to be opened and closed. According to the quick-adjusting valve position feedback mechanism, the connecting rod in the original mechanical valve position feedback mechanism is replaced by the ball screw and the servo motor, so that an adjusted electric signal can be quickly transmitted to the high-pressure adjusting door, a plurality of hydraulic adjusting parts are bypassed, and quick adjustment of the rotating speed, the main steam pressure or the unit power is realized.
Description
Technical Field
The application belongs to the technical field of turbine speed regulation, and particularly relates to a turbine speed regulation system of a steam turbine generator unit and a power regulation method thereof.
Background
Taking a steam turbine of Jiangsu nuclear power unit No. 1/2 as an example, the model of the steam turbine is K-1000/60-3000, an automatic adjusting and protecting system is an electrohydraulic adjusting system, and the electrohydraulic adjusting system automatically adjusts the steam pressure at the inlet of the steam turbine or the electric power of a generator according to a mechanical hydraulic adjusting loop and an electric adjusting loop instructed by a control system or an operator. The mechanical hydraulic regulation loop is completed by a high-speed spring centrifugal speed regulator and a corresponding hydraulic transmission mechanism so as to stabilize the rotating speed of the steam turbine, and the mechanical hydraulic regulation loop is regulated in real time to realize the primary frequency regulation function of hydraulic regulation. When the steam pressure at the inlet of the steam turbine or the electric power of the electric motor exceeds the set value deviation, the synchronizer motor in the electric regulating loop starts to work, and parameters of the unit are regulated to the set value according to main steam pressure control (N mode, namely, machine-following-pile mode) or power control (T mode, namely, machine-following-pile mode).
However, in actual work, because of numerous mechanical hydraulic regulation loop components of the steam turbine, certain hysteresis exists in pressure signal transmission, for example, when regulating electric power, when the average power 1060MW of a generator set runs, the power fluctuation range reaches 15-20 MW, the generator set frequently generates an over-power (1071 MW) alarm, the load of the generator set cannot be set to run at full power (1065 MWA), and the generator set cannot generate electricity at full power.
Disclosure of Invention
In view of this, the embodiments of the present application are directed to providing a turbine speed regulation system of a turbo generator set and a power regulation method thereof, which solves the problem of large power fluctuation of the existing turbo generator set by adding an electric regulation function in a mechanical valve position feedback mechanism of an original turbine speed regulation system.
The first aspect of the application provides a turbine speed regulating system of a steam turbine generator unit, which comprises a hydraulic servo executing mechanism, a high-pressure regulating door and an electric servo regulating mechanism. The hydraulic servo actuating mechanism comprises a feedback sleeve, a wrong throttle slide valve and a hydraulic motor. The high-pressure regulating door is connected with the hydraulic servo actuating mechanism. The electric servo adjusting mechanism comprises a cam, a ball screw and a servo motor. The cam is connected with a feedback sleeve in the hydraulic servo actuating mechanism, and the ball screw is connected with the high-pressure regulating door. When the power fluctuation of the turbo generator set exceeds the set value deviation, the length of the telescopic rod on the ball screw is controlled by the servo motor, the telescopic rod acts on the feedback sleeve through the cam, and the telescopic rod is matched with the wrong throttle slide valve to control the oil inlet and discharge amount of the piston chamber of the oil engine, so that the high-voltage regulating gate is driven to be opened and closed. The steam inlet amount of the turbine changes along with the opening change of the high-pressure regulating gate, the rotating speed of the turbine changes along with the change of the steam inlet amount of the turbine, and the power of the generator changes along with the change of the rotating speed of the turbine.
In the scheme, the connecting rod in the original mechanical valve position feedback mechanism is replaced by the ball screw and the servo motor, the connecting rod with the original fixed length is replaced by the telescopic rod capable of controlling the length of the ball screw through the servo motor, the electric regulating system formed by the ball screw and the servo motor is additionally arranged on the basis of keeping the functions of the original mechanical valve position feedback mechanism in a matched mode with the cam, the regulated electric signal can be quickly transmitted to the high-pressure regulating door, a plurality of hydraulic regulating components are bypassed, and the quick regulation of the rotating speed, the main steam pressure or the unit power is realized.
In one specific implementation of the present application, the input adjustment amount of the servo motor includes any one or more of a power deviation, a rotational speed deviation, and a high voltage adjustment gate fluctuation deviation.
In one specific implementation of the present application, the turbine governor system further includes a high-speed spring centrifugal governor and a hydraulic amplifier and an intermediate slide valve. The hydraulic amplifier and the middle slide valve are positioned between the high-speed spring centrifugal speed regulator and the hydraulic servo actuating mechanism. The high-speed spring centrifugal speed regulator is regulated in real time along with the rotating speed of the steam turbine.
In one specific implementation of the present application, the turbine governor system further includes a synchronizer motor and a synchronizer follower spool. The synchronizer follow-up slide valve is connected with the synchronizer motor and is positioned between the high-speed spring centrifugal speed regulator and the hydraulic amplifier and the middle slide valve.
In one specific implementation of the present application, the input adjustment includes any one or more of a power deviation, a rotational speed deviation, and a high voltage adjustment gate fluctuation deviation. If the input adjustment quantity is power deviation, the set value deviation corresponding to the power deviation is smaller than the adjustment deviation of the electric adjustment of the synchronizer. And if the input adjustment quantity is the rotation speed deviation, the set value deviation corresponding to the rotation speed deviation is smaller than the rotation speed fluctuation quantity of the turbine controlled by the mechanical hydraulic adjustment loop of the turbine.
In one specific implementation of the present application, the number of high voltage regulating gates is a plurality, the number of input regulating amounts is a plurality, and the plurality of input regulating amounts is configured to control any one or more of the plurality of high voltage regulating gates.
The second aspect of the present application provides a power adjustment method for a turbo generator set, where the power adjustment method includes: judging whether the power fluctuation of the steam turbine generator unit exceeds a set value deviation or not; when the power fluctuation of the turbo generator set exceeds the set value deviation, the servo motor in the turbo generator set speed regulating system controls the length of the telescopic rod on the ball screw rod, the telescopic rod acts on the feedback sleeve through the cam, the telescopic rod is matched with the wrong throttle slide valve to control the oil inlet and exhaust quantity of the oil engine piston chamber, the high-pressure regulating gate is driven to switch, the steam inlet quantity of the steam turbine and the rotating speed of the steam turbine are changed along with the change of the opening degree of the high-pressure regulating gate, and finally the power of the generator in the turbo generator set is regulated, so that the power fluctuation of the turbo generator set is maintained within the set value deviation.
In a specific implementation manner of the present application, before determining whether the power fluctuation of the turbo generator set exceeds the set value deviation, the power adjustment method further includes: determining the operation condition of the steam turbine generator unit; if the power platform is running, controlling an electric servo regulating mechanism of a turbine speed regulating system to operate; and if the electric servo regulating mechanism is controlled to be out of operation under other working conditions.
In a specific implementation manner of the present application, the power adjustment method further includes: judging whether the load shedding or the power fluctuation is larger than a preset threshold value or not when the stable power platform operates; and if the load shedding or the power fluctuation is larger than a preset threshold value, controlling the electric servo regulating mechanism to be out of operation.
In one specific implementation of the present application, the preset threshold is 30MW.
Drawings
FIG. 1 is a schematic diagram of a turbine governor system during steady power operation of a turbine.
FIG. 2 is a schematic diagram of a mechanical valve position feedback mechanism in the steam turbine tuning system of the embodiment of FIG. 1.
Fig. 3 is a schematic structural diagram of a turbine speed regulation system of a turbine generator unit according to an embodiment of the present application.
FIG. 4 is a schematic view of an electric servo-regulator in the turbine governor system of the embodiment of FIG. 3.
Fig. 5 is a schematic flow chart of a power adjustment method of a turbo generator set according to an embodiment of the present application.
Fig. 6 is a schematic flow chart of a power adjustment method of a turbo generator set according to another embodiment of the present application.
Detailed Description
Taking K1000-60/3000 type turbine speed regulating system as an example, the regulating components of the turbine speed regulating system during the steady power operation of the unit mainly comprise components such as a high-speed spring centrifugal speed regulator, a synchronizer motor 2, a synchronizer follow-up slide valve 3, a hydraulic amplifier and an intermediate slide valve 4, a hydraulic servo executing mechanism 5 (a feedback sleeve-a wrong throttle slide valve-a hydraulic engine) (4 sets), a high-pressure regulating door 6 (4 sets) and the like.
The following description is made of the technical scheme in a power control mode, i.e., a heel stacker mode.
FIG. 1 is a schematic illustration of a turbine speed regulation system during steady power operation of a turbine unit. FIG. 2 is a schematic diagram of a mechanical valve position feedback mechanism in the steam turbine tuning system of the embodiment of FIG. 1.
As can be seen from fig. 1, the regulation process of the turbine speed regulation system during the steady power operation of the unit mainly comprises two regulation loops, namely a mechanical hydraulic regulation loop consisting of a high-speed spring centrifugal speed regulator 1, a synchronizer follow-up slide valve 3, a hydraulic amplifier and middle slide valve 4, a hydraulic servo actuator 5 (a feedback sleeve-a wrong throttle slide valve-a hydraulic motor), a high-pressure regulating gate 6 and a mechanical valve position feedback mechanism 7; and the second is a synchronizer electric regulating loop consisting of a synchronizer motor 2, a synchronizer follow-up slide valve 3, a hydraulic amplifier, an intermediate slide valve 4, a hydraulic servo actuating mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor), a high-pressure regulating gate 6 and a mechanical valve position feedback mechanism 7. In the common parts of the two loops, a mechanical valve position feedback mechanism 7 (the structure diagram is shown in fig. 2) exists between the hydraulic servo actuating mechanism 5 (a feedback sleeve-a wrong throttle slide valve-a hydraulic motor) and the high-pressure regulating door 6, the mechanical valve position feedback mechanism 7 consists of a cam 71 and a connecting rod 72, and works together with a spring and a feedback sleeve on the hydraulic servo actuating mechanism 5 (the feedback sleeve-the wrong throttle slide valve-the hydraulic motor) to reversely act on the valve position change of the high-pressure regulating door 6 on the hydraulic servo actuating mechanism 5 (the feedback sleeve-the wrong throttle slide valve-the hydraulic motor) so as to keep the power oil pressure of the hydraulic servo actuating mechanism 5 (the feedback sleeve-the wrong throttle slide valve-the hydraulic motor) stable, thereby keeping the valve position of the high-pressure regulating door 6 stable.
The working process of the mechanical hydraulic regulating loop of the steam turbine comprises the following steps: when the rotating speed of the turbine changes, the high-speed spring centrifugal speed regulator 1 converts the rotating speed of the turbine into the axial displacement of the baffle plate of the high-speed spring centrifugal speed regulator through centrifugal force, so that the gap between the nozzle and the baffle plate changes; the synchronizer servo slide valve 3 is converted into opening change of an oil drain port of a primary pulsation oil way according to the gap change of the nozzle and the baffle plate, so that the control of the primary pulsation oil pressure is realized; the hydraulic amplifier and the middle slide valve 4 are used as a pressure control amplifying unit to convert the change of the primary pulsation oil pressure into the servo control of the secondary pulsation oil pressure; the secondary pulsation oil pressure enters the hydraulic servo mechanism of the high-pressure regulating gate 6, and the secondary pulsation oil pressure is converted into displacement of the wrong throttle slide valve through the cooperation of the wrong throttle slide valve and a spring in the hydraulic servo actuating mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor), so as to control the oil inlet and discharge quantity of a piston chamber of the oil motor and drive the high-pressure regulating gate 6 to switch and operate; the valve position change of the high-pressure regulating gate 6 is converted into displacement of the feedback sleeve in the same direction as the wrong throttle slide valve by a feedback sleeve in the hydraulic servo executing mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor) through a mechanical valve position feedback mechanism 7, when the displacement of the feedback sleeve is equal to the displacement of the wrong throttle slide valve, an oil port of the wrong throttle is blocked, the regulating process of the opening degree of the high-pressure regulating gate 6 is finished, and the stroke of the oil motor is kept unchanged; the high-pressure regulating gate 6 can influence the steam inlet amount of the turbine when opening changes, and finally influences the rotating speed of the turbine, and the rotating speed of the turbine and the load of the unit are stabilized through repeated cyclic feedback.
The synchronizer electric regulation loop working process comprises the following steps: when the power fluctuation of the unit exceeds the set value deviation X1, the axial displacement of the synchronizer follow-up slide valve 3 is regulated by the synchronizer motor 2, the opening of an oil drain port of a primary pulsation oil way is changed, and the control of the primary pulsation oil pressure is realized; the hydraulic amplifier and the middle slide valve 4 are used as a pressure control amplifying unit to convert the change of the primary pulsation oil pressure into the servo control of the secondary pulsation oil pressure; the secondary pulsation oil pressure enters the hydraulic servo mechanism of the high-pressure regulating gate 6, and the secondary pulsation oil pressure is converted into displacement of the wrong throttle slide valve through the cooperation of the wrong throttle slide valve and a spring in the hydraulic servo actuating mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor), so as to control the oil inlet and discharge quantity of a piston chamber of the oil motor and drive the high-pressure regulating gate 6 to switch and operate; the valve position change of the high-pressure regulating gate 6 is converted into displacement of the feedback sleeve in the same direction as the wrong throttle slide valve by a feedback sleeve in the hydraulic servo executing mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor) through a mechanical valve position feedback mechanism 7, when the displacement of the feedback sleeve is equal to the displacement of the wrong throttle slide valve, an oil port of the wrong throttle is blocked, the regulating process of the opening degree of the high-pressure regulating gate 6 is finished, and the stroke of the oil motor is kept unchanged; when the opening of the high-pressure regulating door 6 is changed, the steam inlet amount of the steam turbine is influenced, the rotating speed of the steam turbine is influenced, and finally the power is fed back to the power of the generator, so that the unit power is maintained to be in a set value for operation.
Through careful research, the regulation process of the K1000-60/3000 type turbine speed regulating system when the power control mode unit operates at the stable power can be seen, and the turbine mechanical hydraulic regulation loop carries out real-time regulation along with the turbine rotating speed through the high-speed spring centrifugal speed regulator 1; the synchronizer electric regulating circuit is regulated to be restored to the set value by the synchronizer motor 2 only when the unit power fluctuation exceeds the set value deviation X1. The opening degree of the high-pressure regulating gate 6 is regulated by changing the pressure of the primary and secondary pulsation oil through a plurality of hydraulic regulating components such as the synchronizer motor 2, the synchronizer follow-up slide valve 3, the hydraulic amplifier, the middle slide valve 4 and the like in both regulating modes, so that the high-pressure regulating gate 6 has the phenomenon of regulation lag or overshoot, and finally, the power fluctuation is large as a result of feedback to the power of the unit.
In order to solve at least one of the above problems, the present application provides a turbine speed regulating system of a turbine generator set and a power regulating method thereof, and in the following, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Fig. 3 is a schematic structural diagram of a turbine speed regulation system of a turbine generator unit according to an embodiment of the present application. FIG. 4 is a schematic view of an electric servo-regulator in the turbine governor system of the embodiment of FIG. 3.
As shown in fig. 3 and 4, the turbine speed regulating system of the turbo generator set comprises a hydraulic servo actuator 5, a high-pressure regulating door 6 and an electric servo regulating mechanism 8. The hydraulic servo actuator 5 comprises a feedback sleeve, a throttle error slide valve and a hydraulic motor. The high-pressure regulating gate 6 is connected with the hydraulic servo actuator 5. The electric servo-adjusting mechanism 8 includes a cam 81, a ball screw 82, and a servo motor 83. The cam 81 is connected to a feedback sleeve in the hydraulic servo actuator 5, and the ball screw 82 is connected to the high-pressure regulating gate 6. When the input adjustment quantity of the servo motor exceeds the set value deviation, the length of a telescopic rod on the ball screw 82 is controlled by the servo motor, the telescopic rod is acted on a feedback sleeve through a cam 81, the oil inlet and outlet quantity of a piston chamber of the oil engine is controlled by being matched with a wrong throttle slide valve, the high-pressure adjusting door 6 is driven to be switched on and off, the steam inlet quantity of a turbine changes along with the change of the opening of the high-pressure adjusting door 6, the rotating speed of the turbine changes along with the change of the steam inlet quantity of the turbine, and the power of a generator changes along with the change of the rotating speed of the turbine.
According to the technical scheme that this application embodiment provided, through setting up electric servo adjustment mechanism 8 and including cam 81, ball 82 and servo motor 83, replace ball 82 and servo motor 83 with the connecting rod 72 in the former mechanical valve position feedback mechanism 7, replace the connecting rod 72 of original fixed length for can control telescopic link length in the ball 82 through servo motor 83, with cam 81 cooperation increased the electric regulation system that constitutes by ball 82 and servo motor 83 on the basis that keeps former mechanical valve position feedback mechanism 7 function, can be with the signal of telecommunication of regulation on the high pressure regulating door 6, bypass a plurality of hydraulic pressure regulating parts, realized the quick regulation to rotational speed, main steam pressure or unit power. The electric private clothes adjusting mechanism in the embodiment of the application is adjusted by matching the servo motor 83 and the ball screw 82, so that accurate telescopic rod displacement can be realized under the condition of low energy consumption, and the effect of low consumption and high accuracy is achieved.
In addition, the original mechanical valve position feedback mechanism 7 is composed of a cam 71 and a link 72, and is used only as a mechanical transmission of component displacement. The hydraulic servo actuating mechanism 5, the high-pressure regulating door 6 and the electric servo regulating mechanism 8 in the turbine speed regulating system form an electric servo regulating loop of the turbine speed regulating system. According to the embodiment of the application, the electric adjusting function is added in the original mechanical valve position feedback mechanism 7, so that the valve position feedback mechanism in the mechanical hydraulic adjusting loop is optimized, the speed of adjusting the parameters of the turbine is improved, the phenomenon of hysteresis or overshoot is avoided, and the purpose of stabilizing the power of the turbine is achieved.
For example, in the following, referring to fig. 3 and 4, an operation procedure of the electric servo-regulator circuit of the turbine speed regulating system in the embodiment of the present application when the unit is operated at the steady power will be illustrated.
The working process of the electric servo regulating loop comprises the following steps: when the power fluctuation of the unit exceeds the set value deviation X2, the length of a telescopic rod in the ball screw 82 is regulated by a servo motor 83 in the electric servo regulating mechanism 8, the telescopic rod acts on a feedback sleeve in the hydraulic servo executing mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor) through a cam 81, the telescopic rod is matched with the wrong throttle slide valve to control the oil inlet and exhaust quantity of a piston chamber of the oil motor, the high-pressure regulating gate 6 is driven to switch, the steam inlet quantity of a steam turbine is influenced when the opening degree of the high-pressure regulating gate 6 is changed, the rotating speed of the steam turbine is influenced, and finally the telescopic rod is fed back to the power of a generator, so that the power of the unit is maintained to be in the set value operation.
In some embodiments, to ensure that the electric servo-regulator 8 has the function of the original mechanical valve position feedback mechanism 7, and that the regulating characteristics of the high-pressure regulating door 6 remain unchanged, the reference length of the telescopic rod (i.e. the telescopic link) in the electric servo-regulator 8 is the same as the length of the link in the original mechanical valve position feedback mechanism 7.
In at least one embodiment of the present application, the input adjustment amount of the servo motor 83 includes any one or more of a power deviation, a rotational speed deviation, and a high-voltage adjustment gate fluctuation deviation.
The input adjustment amount is the power deviation: when the deviation between the power of the unit and the set value exceeds X2 megawatts, the power of the unit is regulated, and the power of the unit is restored to the set power, wherein the electric servo regulation deviation X2 is smaller than the regulation deviation X1 of the electric regulation of the synchronizer.
The input adjustment quantity is the rotation speed deviation: when the deviation between the rotating speed of the turbine and the set value exceeds X3rpm, the rotating speed of the turbine is controlled to be stabilized near the set value, and the electric servo adjustment deviation X3 is smaller than the fluctuation amount of the rotating speed of the turbine controlled by the mechanical hydraulic adjustment loop of the turbine.
The input adjustment quantity is the fluctuation deviation of the high-voltage adjusting door: when the unit power is stable, the valve position of the high-pressure regulating door 6 fluctuates within a certain range, the average value of the valve positions at the moment is selected as a target valve position, the valve position is regulated through the electric servo regulating loop, and the opening of the valve is stable and motionless when the unit parameter is stable.
It should be noted that the number of the high-voltage adjusting gates 6 may be plural, and an electric adjusting system may be added for each high-voltage adjusting gate 6, so that single-channel adjustment of each high-voltage adjusting gate 6 may be realized, and the change of the air intake of the high-voltage cylinder may be controlled more precisely.
In at least one embodiment of the present application, the number of high-voltage regulating gates 6 is plural, the number of input regulating amounts is plural, and the plural input regulating amounts are configured to control any one or more of the plural high-voltage regulating gates 6.
For example, the input adjustment amounts include three adjustment inputs including power deviation, rotation speed deviation and fluctuation deviation of the high-voltage adjustment doors, and the number of the high-voltage adjustment doors 6 is 4, so that the three adjustment inputs can control the 4 high-voltage adjustment doors simultaneously, or can control any one of the high-voltage adjustment doors 6 independently, that is, can control all of the 4 high-voltage adjustment doors to throw power deviation or rotation speed deviation, can also realize 3 high-voltage adjustment doors to throw power deviation adjustment, and can realize that the 3 high-voltage adjustment doors throw power deviation adjustment, so as to obtain the minimum fluctuation disturbance of the air intake amount when the unit stably operates.
In at least one embodiment of the present application, the turbine governor system further includes a high-speed spring centrifugal governor 1 and a hydraulic amplifier and intermediate slide valve 4. The hydraulic amplifier and the intermediate slide valve 4 are located between the high-speed spring centrifugal governor 1 and the hydraulic servo actuator 5. The high-speed spring centrifugal speed regulator 1 carries out real-time regulation along with the rotating speed of the steam turbine. Therefore, a mechanical hydraulic regulation loop of the steam turbine is formed by arranging the high-speed spring centrifugal speed regulator 1, the hydraulic amplifier and the middle slide valve 4 in the speed regulation system of the steam turbine, and the functions of the original speed regulation system are reserved.
In at least one embodiment of the present application, the turbine governor system further includes a synchronizer motor 2 and a synchronizer follower spool 3. The synchronizer follow-up slide valve 3 is connected with the synchronizer motor 2 and is positioned between the high-speed spring centrifugal speed regulator 1 and the hydraulic amplifier and middle slide valve 4. Therefore, by arranging the synchronizer motor 2 and the synchronizer follow-up slide valve 3 in the turbine speed regulating system, an electric synchronizer regulating loop is formed, and the original speed regulating system function is maintained. According to the embodiment of the application, the basic design of the original turbine speed regulating system is not changed, and only one electric regulating system is added in the turbine mechanical regulating feedback loop, so that the high-pressure regulating door 6 can be directly finely regulated, and the purpose of quickly stabilizing the unit parameters is achieved.
The turbine mechanical hydraulic regulation loop consists of a high-speed spring centrifugal speed regulator 1, a synchronizer follow-up slide valve 3, a hydraulic amplifier and an intermediate slide valve 4, a hydraulic servo actuating mechanism 5 (a feedback sleeve-a wrong throttle slide valve-a hydraulic motor), a high-pressure regulating gate 6 and an electric servo regulating mechanism 8.
The working process of the mechanical hydraulic regulating loop of the steam turbine comprises the following steps: when the rotating speed of the turbine changes, the high-speed spring centrifugal speed regulator 1 converts the rotating speed of the turbine into the axial displacement of the baffle plate of the high-speed spring centrifugal speed regulator through centrifugal force, so that the gap between the nozzle and the baffle plate changes; the synchronizer servo slide valve 3 is converted into opening change of an oil drain port of a primary pulsation oil way according to the gap change of the nozzle and the baffle plate, so that the control of the primary pulsation oil pressure is realized; the hydraulic amplifier and the middle slide valve 4 are used as a pressure control amplifying unit to convert the change of the primary pulsation oil pressure into the servo control of the secondary pulsation oil pressure; the secondary pulsation oil pressure enters the hydraulic servo mechanism of the high-pressure regulating gate 6, and the secondary pulsation oil pressure is converted into displacement of the wrong throttle slide valve through the cooperation of the wrong throttle slide valve and a spring in the hydraulic servo actuating mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor), so as to control the oil inlet and discharge quantity of a piston chamber of the oil motor and drive the high-pressure regulating gate 6 to switch and operate; the valve position change of the high-pressure regulating valve 6 is converted into displacement in the same direction of the feedback sleeve and the wrong throttle slide valve by an electric servo regulating mechanism 8 (the function of the original mechanical valve position feedback mechanism 7) through a feedback sleeve in the hydraulic servo executing mechanism 5 (the feedback sleeve is the wrong throttle slide valve and the oil motor), when the displacement amounts of the feedback sleeve and the wrong throttle slide valve are equal, the wrong throttle oil port is blocked, the regulating process of the opening of the high-pressure regulating valve 6 is finished, and the stroke of the oil motor is kept unchanged; the high-pressure regulating gate 6 can influence the steam inlet amount of the turbine when opening changes, and finally influences the rotating speed of the turbine, and the rotating speed of the turbine and the load of the unit are stabilized through repeated cyclic feedback.
The synchronizer electric regulating circuit is composed of a synchronizer motor 2, a synchronizer follow-up slide valve 3, a hydraulic amplifier and an intermediate slide valve 4, a hydraulic servo actuating mechanism 5, a high-pressure regulating door 6 and an electric servo regulating mechanism 8.
The synchronizer electric regulation loop working process comprises the following steps: when the power fluctuation of the unit exceeds the set value deviation X1, the axial displacement of the synchronizer follow-up slide valve 3 is regulated by the synchronizer motor 2, the opening of an oil drain port of a primary pulsation oil way is changed, and the control of the primary pulsation oil pressure is realized; the hydraulic amplifier and the middle slide valve 4 are used as a pressure control amplifying unit to convert the change of the primary pulsation oil pressure into the servo control of the secondary pulsation oil pressure; the secondary pulsation oil pressure enters the hydraulic servo mechanism of the high-pressure regulating gate 6, and the secondary pulsation oil pressure is converted into displacement of the wrong throttle slide valve through the cooperation of the wrong throttle slide valve and a spring in the hydraulic servo actuating mechanism 5 (feedback sleeve-wrong throttle slide valve-oil motor), so as to control the oil inlet and discharge quantity of a piston chamber of the oil motor and drive the high-pressure regulating gate 6 to switch and operate; the valve position change of the high-pressure regulating valve 6 is converted into displacement in the same direction of the feedback sleeve and the wrong throttle slide valve by an electric servo regulating mechanism 8 (the function of the original mechanical valve position feedback mechanism 7) through a feedback sleeve in the hydraulic servo executing mechanism 5 (the feedback sleeve is the wrong throttle slide valve and the oil motor), when the displacement amounts of the feedback sleeve and the wrong throttle slide valve are equal, the wrong throttle oil port is blocked, the regulating process of the opening of the high-pressure regulating valve 6 is finished, and the stroke of the oil motor is kept unchanged; when the opening of the high-pressure regulating door 6 is changed, the steam inlet quantity of the steam turbine is influenced, the rotating speed of the steam turbine is influenced, and finally the high-pressure regulating door is fed back to the power of the generator, so that the unit power is maintained to be operated at a set value.
Fig. 5 is a schematic flow chart of a power adjustment method of a turbo generator set according to an embodiment of the present application. As shown in fig. 5, the power adjustment method includes the following steps.
S10: and judging whether the power fluctuation of the steam turbine generator unit exceeds the set value deviation.
S20: when the power fluctuation of the turbo generator set exceeds the set value deviation, the servo motor in the turbo generator set speed regulating system controls the length of the telescopic rod on the ball screw rod, the telescopic rod acts on the feedback sleeve through the cam, the telescopic rod is matched with the wrong throttle slide valve to control the oil inlet and exhaust quantity of the oil engine piston chamber, the high-pressure regulating gate is driven to be switched on and off, the steam inlet quantity of the steam turbine and the rotating speed of the steam turbine are changed along with the change of the opening degree of the high-pressure regulating gate, and finally the power of the generator in the turbo generator set is regulated, so that the power fluctuation of the turbo generator set is maintained in the set value deviation.
It should be noted that the turbine speed regulation system may be any hydraulic regulation type turbine speed regulation system, including but not limited to K1000-60/3000 type turbine speed regulation system.
The power adjustment method embodiment is a method embodiment corresponding to the turbine speed regulation system in the embodiment of the present application, and related technical features and technical effects thereof may be referred to the description in the embodiment of the present application, and are not repeated herein.
Fig. 6 is a schematic flow chart of a power adjustment method of a turbo generator set according to another embodiment of the present application. The embodiment shown in fig. 6 is a modification of the embodiment shown in fig. 5. As shown in fig. 6, the power adjustment method further includes steps S3 and S4 before step S10, which is different from the embodiment shown in fig. 5.
S3: and determining the operation condition of the steam turbine generator unit.
S4: and if the power platform operates stably, controlling the electric servo regulating mechanism of the turbine speed regulating system to operate.
S5: and if the electric servo regulating mechanism is in other operation conditions, controlling the electric servo regulating mechanism to exit operation.
For example, the electric servo control loop is only put into operation when the stabilized power platform is in operation, and the telescopic rod in the mechanism is locked at the reference length by the servo motor 83 when the stabilized power platform is in operation under other working conditions, namely, the control characteristics of the unit are the same as those before the electric servo control loop is added during the lifting power.
It should be noted that, when the servo motor 83 is out of operation, the ball screw may independently perform the function of the original mechanical link, that is, the newly added electric private service adjusting circuit has the fault tolerance recovery function.
In a specific implementation of the present application, the power adjustment method further includes steps S1 and S2.
S1: and when the stable power platform operates, judging whether the load shedding or the power fluctuation is larger than a preset threshold value.
S2: and if the load shedding or the power fluctuation is larger than a preset threshold value, controlling the electric servo regulating mechanism to be out of operation.
The preset threshold may be set according to actual requirements, which is not specifically limited in the embodiments of the present application.
For example, the preset threshold is 30MW, after the steady power operation is put into operation, if the load is thrown or the power fluctuation is greater than 30MW, the electric servo control loop automatically exits the operation, and the telescopic rod in the mechanism is quickly restored to the reference length by the servo motor 83.
It should be noted that, the combination of the technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all the technical features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A turbine speed regulation system for a steam turbine generator unit, comprising:
the hydraulic servo actuating mechanism comprises a feedback sleeve, a wrong throttle slide valve and a hydraulic motor;
the high-pressure adjusting door is connected with the hydraulic servo actuating mechanism; and
the electric servo adjusting mechanism comprises a cam, a ball screw and a servo motor, wherein the cam is connected with the feedback sleeve in the hydraulic servo actuating mechanism, the ball screw is connected with the high-pressure adjusting door,
when the input adjustment quantity of the servo motor exceeds the set value deviation, the servo motor controls the length of the telescopic rod on the ball screw, the telescopic rod acts on the feedback sleeve through the cam and is matched with the wrong throttle slide valve to control the oil inlet and oil outlet quantity of the piston chamber of the oil engine, the high-pressure adjusting door is driven to be opened and closed, the steam inlet quantity of the steam turbine changes along with the opening change of the high-pressure adjusting door, the rotating speed of the steam turbine changes along with the change of the steam inlet quantity of the steam turbine, and the power of the generator changes along with the change of the rotating speed of the steam turbine.
2. The turbine governor system of claim 1, further comprising:
high-speed spring centrifugal speed regulator; and
the hydraulic amplifier and the middle slide valve are positioned between the high-speed spring centrifugal speed regulator and the hydraulic servo actuating mechanism, wherein the high-speed spring centrifugal speed regulator is regulated in real time along with the rotating speed of the steam turbine.
3. The turbine governor system of claim 2, further comprising:
a synchronizer motor;
and the synchronizer follow-up slide valve is connected with the synchronizer motor and is positioned between the high-speed spring centrifugal speed regulator and the hydraulic amplifier as well as the middle slide valve.
4. A turbine speed regulation system according to any one of claims 1 to 3,
the input adjustment amount includes any one or more of a power deviation, a rotational speed deviation, and a high-voltage adjustment gate fluctuation deviation,
wherein if the input adjustment quantity is power deviation, the set value deviation corresponding to the power deviation is smaller than the adjustment deviation of the electric adjustment of the synchronizer,
and if the input adjustment quantity is the rotation speed deviation, the set value deviation corresponding to the rotation speed deviation is smaller than the rotation speed fluctuation quantity of the turbine controlled by the mechanical hydraulic pressure adjusting circuit of the turbine.
5. The turbine governor system of claim 4, wherein the number of high pressure governor gates is a plurality, the number of input governor gates is a plurality, and a plurality of the input governor gates are configured to control any one or more of the plurality of high pressure governor gates.
6. A method for regulating power of a turbo generator set, comprising:
judging whether the power fluctuation of the steam turbine generator unit exceeds a set value deviation or not;
when the power fluctuation of the turbo generator set exceeds the set value deviation, the servo motor of the turbo generator set speed regulating system controls the length of the telescopic rod on the ball screw, the telescopic rod acts on the feedback sleeve through the cam, the telescopic rod cooperates with the throttle spool valve to control the oil inlet and exhaust quantity of the piston chamber of the oil engine, the high-pressure regulating gate is driven to operate, the steam inlet quantity of the steam turbine and the rotating speed of the steam turbine are changed along with the change of the opening of the high-pressure regulating gate, and finally the power of the generator in the turbo generator set is regulated to maintain the power fluctuation of the turbo generator set within the set value deviation.
7. The power conditioning method according to claim 6, further comprising, prior to said determining whether the power fluctuation of the turbo generator set exceeds a set point deviation:
determining the operation condition of the steam turbine generator unit;
if the power platform is running, controlling the electric servo regulating mechanism of the turbine speed regulating system to operate;
and if the electric servo regulating mechanism is in other operation conditions, controlling the electric servo regulating mechanism to exit operation.
8. The power conditioning method of claim 7, further comprising:
judging whether the load shedding or the power fluctuation is larger than a preset threshold value or not when the stable power platform operates;
and if the load shedding or the power fluctuation is larger than the preset threshold value, controlling the electric servo regulating mechanism to withdraw from operation.
9. The method of power adjustment according to claim 8, characterized in that,
the preset threshold is 30MW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311756506.0A CN117703539A (en) | 2023-12-19 | 2023-12-19 | Turbine speed regulating system of steam turbine generator unit and power regulating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311756506.0A CN117703539A (en) | 2023-12-19 | 2023-12-19 | Turbine speed regulating system of steam turbine generator unit and power regulating method thereof |
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| Publication Number | Publication Date |
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| CN117703539A true CN117703539A (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311756506.0A Pending CN117703539A (en) | 2023-12-19 | 2023-12-19 | Turbine speed regulating system of steam turbine generator unit and power regulating method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117703539A (en) |
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2023
- 2023-12-19 CN CN202311756506.0A patent/CN117703539A/en active Pending
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