Turning control method and device

Abstract

The invention belongs to the field of barring control, and particularly relates to a barring control method and device, which realize barring input and barring exit by controlling barring input and exit logic. The barring input control method comprises the steps that the rotor rotating speed after a steam turbine is shut down is obtained, and when the rotor rotating speed of the steam turbine is reduced to a first rotating speed set value, lubricating oil enters a barring; turning soft start condition parameters are obtained, whether the turning soft start condition parameters meet the corresponding set parameters or not is judged, if yes, a turning driving gear is controlled to be meshed with a large gear of the steam turbine, and the turning is put into the steam turbine; the barring quit control method comprises the steps that after barring is input, when the rotating speed of a turbine large gear is larger than that of a barring driving gear or the barring needs to quit actively, the barring driving gear is controlled to be disengaged from the turbine large gear, and barring lubricating oil supply is stopped; according to the barring control method, the barring meshing and disengaging process is smoother, the stability and reliability of the system are improved, and the service life of the system is prolonged.

Description

Technical Field

[0001] This application belongs to the field of barring control, and particularly relates to a barring control method and device. Background Art

[0002] The traditional barring control method for steam turbines is to implement the control logic through a local PLC (Programmable Logic Controller) control cabinet or in a DCS (Distributed Control System). This method often causes relatively large impacts and wear on the motor and gears. In recent years, the soft start control method for barring has gradually replaced the traditional method and become the mainstream solution. By restricting the starting current and adjusting the starting torque, this impact and wear have been effectively reduced. However, after the soft starter circuit is adopted in the local control cabinet, the logic is still implemented by the DCS, resulting in situations such as unsmooth process implementation, imperfect control logic, and low success rate of automatic input. Summary of the Invention

[0003] A barring control method and device are proposed to solve the problem of low success rate of automatic input after the soft start of the local barring control cabinet in the prior art;

[0004] A barring control method includes: a barring input control method and a barring withdrawal control method; the barring input control method includes:

[0005] Step 1: Obtain the rotor speed after the steam turbine stops. When the rotor speed of the steam turbine drops to the first speed set value, make the lubricating oil enter the barring;

[0006] Step 2: Obtain the barring soft start condition parameters, and determine whether the barring soft start condition parameters meet the corresponding set parameters. If so, control the barring handle to be in the working position to engage the large gear of the steam turbine with the driving gear of the barring, and make the barring be put into the steam turbine;

[0007] The barring withdrawal control method includes:

[0008] After the barring is put in, when the speed of the large gear of the steam turbine is greater than the speed of the driving gear of the barring or when the barring needs to be actively withdrawn, control the barring handle to be in the non - working position to disengage the large gear of the steam turbine from the driving gear of the barring, and stop the supply of barring lubricating oil.

[0009] A barring control device includes: a data acquisition module, a data processing module, a controller, and a human - machine interaction module;

[0010] The data acquisition module is used to obtain the rotor speed signal after the steam turbine stops and the barring soft start condition parameter signal, and send the rotor speed signal and the barring soft start condition parameter signal after the steam turbine stops to the data processing module;

[0011] The data processing module is used to determine whether the received rotor speed signal of the steam turbine after shutdown is less than or equal to the first speed signal setting value, and if so, generate a pre-start signal, and send the pre-start signal to the controller; determine whether the received cranking soft start condition parameter signal meets the corresponding setting parameter signal to obtain a judgment result, and generate a cranking input signal according to the generated pre-start signal and the obtained judgment result, and send the cranking input signal to the controller;

[0012] The controller is used to control the data acquisition module to obtain the cranking gear soft start condition parameter signal according to the received pre-start signal; and control the cranking gear driving gear to mesh with the turbine gear according to the received cranking gear input signal;

[0013] The data acquisition module is also used to obtain the speed signal of the steam turbine gear and the speed signal of the cranking gear driving gear, and send the speed signal of the steam turbine gear and the speed signal of the cranking gear driving gear to the data processing module;

[0014] The data processing module determines whether the speed of the steam turbine gear is greater than the speed of the cranking gear according to the received steam turbine gear speed signal and the cranking gear driving gear speed signal. If so, a cranking gear disengagement signal is generated and the cranking gear disengagement signal is sent to the controller;

[0015] The human-machine interaction module is used to generate a turning gear active exit signal and send the turning gear active exit signal to the controller;

[0016] The controller is also used to control the disengagement of the turning gear driving gear from the turbine large gear and stop the supply of turning gear lubricating oil according to the received turning gear disengagement signal or the turning gear active exit signal.

[0017] The beneficial effects of the present application are as follows: a cranking control method of the present application realizes cranking input and cranking exit by controlling the cranking input and exit logic, and the present invention has the following advantages:

[0018] 1. Make the engagement and disengagement process of the gear smoother. The control method of this application can effectively reduce the friction between gears and improve the stability, reliability and service life of the system;

[0019] 2. The turning gear control method of the present application can independently manage the turning gear master control logic, realize the entire process of turning gear input and output, reduce the dependence on DCS, and can start the turning gear even when the discrete control system of the whole plant fails, increase the risk resistance, and enhance the reliability and stability of the system. It realizes the protection and control of key equipment in emergency situations, and effectively avoids production interruption and equipment damage caused by system failure;

[0020] 3. The barring gear control device of the present application adds a human-machine interaction unit, which has stronger operability and expandability, and has a good human-machine interaction setting method for some common parameters such as time control, input inversion control, and control mode selection, facilitating customization and upgrading.

[0021] 4. The barring gear control device of the present application is a non-PLC type thermal control device, suitable for harsh environments such as in-situ and on-site, with low maintenance costs, and can work and operate for a long time. Description of the Drawings

[0022] Figure 1 It is the barring gear engagement timing diagram of the specific embodiment of the present application;

[0023] Figure 2 It is the barring gear withdrawal timing diagram when the rotational speed of the large gear of the steam turbine is greater than that of the driving gear of the barring gear in the specific embodiment of the present application;

[0024] Figure 3 It is the barring gear withdrawal timing diagram when the barring gear actively withdraws in the specific embodiment of the present application;

[0025] Figure 4 It is the structure diagram of the barring gear control device in the specific embodiment of the present application;

[0026] Figure 5 It is the logic block diagram of the barring gear engagement instruction in the specific embodiment of the present application;

[0027] Figure 6 It is the logic block diagram of the engagement solenoid valve and the air release solenoid valve instructions in the specific embodiment of the present application;

[0028] Figure 7 It is the logic block diagram of the disengagement solenoid valve instruction in the specific embodiment of the present application;

[0029] Figure 8 It is the logic block diagram of the barring gear motor start instruction in the specific embodiment of the present application. Specific Embodiment

[0030] Specific Embodiment 1: The following will combine the attached drawings in the embodiments of the present invention Figure 1 to Figure 8 , describe this embodiment, and clearly and completely describe the technical solutions in the embodiments of the present invention:

[0031] A barring gear control method, characterized in that it includes: a barring gear engagement control method and a barring gear withdrawal control method; the barring gear engagement control method includes:

[0032] Step 1: Obtain the rotational speed of the rotor after the steam turbine shuts down. When the rotational speed of the steam turbine rotor drops to the first rotational speed set value, make the lubricating oil enter the barring gear;

[0033] Step 2: Obtain the turning gear soft start condition parameters, and determine whether the turning gear soft start condition parameters meet the corresponding set parameters. If so, control the turning gear handle to be in the working position to engage the large steam turbine gear with the driving gear of the turning gear, and put the turning gear into the steam turbine;

[0034] The turning gear withdrawal control method includes:

[0035] After the turning gear is put in, when the speed of the large steam turbine gear is greater than the speed of the driving gear of the turning gear or when the driving gear of the turning gear needs to be withdrawn actively, control the turning gear handle to be in the non-working position to disengage the large steam turbine gear from the driving gear of the turning gear, and stop the supply of turning gear lubricating oil.

[0036] Specifically, before the turning gear is put in, after the steam turbine stops, the rotor starts to coast down (when the steam turbine stops, the period from the closing of the automatic main steam valve and the governing valve to the complete stop of the rotor is called the rotor coast down). When the speed of the steam turbine rotor drops to the first speed set value, the turning gear oil injection solenoid valve starts, allowing lubricating oil to enter the turning gear device; when the turning gear meets the soft start condition, control the driving gear of the turning gear to disengage from the large steam turbine gear, and stop the supply of turning gear lubricating oil; after the turning gear of the steam turbine is put in, when the turning gear needs to be overhauled, the turning gear needs to be disengaged from the rotor gear of the steam turbine, and the supply of turning gear lubricating oil is stopped.

[0037] Further, the turning gear soft start condition parameters include the turning gear lubricating oil pressure, the turning gear jacking oil pressure, the speed of the steam turbine rotor, and whether the turning gear motor end cover is locked; determining whether the turning gear soft start condition parameters meet the corresponding set parameters includes: simultaneously determining whether the turning gear lubricating oil pressure is within the lubricating oil pressure set range, whether the turning gear jacking oil pressure is within the jacking oil pressure set range, whether the speed of the steam turbine rotor is less than the second speed set value, and whether the turning gear motor end cover is locked; if the turning gear lubricating oil pressure is within the lubricating oil pressure set range, the turning gear jacking oil pressure is within the jacking oil pressure set range, the speed of the steam turbine rotor is less than the second speed set value, and the turning gear motor end cover is locked, then the turning gear soft start condition parameters meet the corresponding set parameters.

[0038] Specifically, when the turning gear meets the soft start condition, the turning gear automatic input process starts.

[0039] Further, the method for controlling the turning gear handle to be in the working position to engage the large steam turbine gear with the driving gear of the turning gear includes:

[0040] Step 21: Set the threshold of the number of input times, and set the number of input times i = 1;

[0041] Step 22: Open the turning gear disengagement solenoid valve; opening the turning gear disengagement solenoid valve makes the turning gear handle in the non-working position, and disengages the driving gear of the turning gear from the large steam turbine gear; close it 1 second after starting the motor, so that the driving gear of the turning gear rotates at an initial speed;

[0042] Step 23: After the motor is turned off for 2 seconds, start the meshing solenoid valve and the air release solenoid valve of the barring gear. After starting the meshing solenoid valve and the air release solenoid valve, detect whether the driving gear of the barring gear is meshed with the large gear of the steam turbine and whether the meshing limit switch is closed at an interval of the set time. If the driving gear of the barring gear is meshed with the large gear of the steam turbine and the meshing limit switch is closed, go to Step 24; otherwise, go to Step 25; the meshing solenoid valve and the air release solenoid valve are opened simultaneously to make the barring gear handle in the working position; the meshing limit switch is used to close after the driving gear of the barring gear is meshed with the large gear of the steam turbine;

[0043] Step 24: Start the motor to make the driving gear of the barring gear reach the rated speed; after the driving gear of the barring gear reaches the rated speed, close the meshing solenoid valve and the air release solenoid valve after an interval of 10 seconds and end;

[0044] Step 25: Let the number of input times \(i = i + 1\), and judge whether the number of input times \(i\) is greater than or equal to the input times threshold. If so, go to Step 27; if the number of input times \(i\) is less than the set input times threshold, go to Step 26;

[0045] Step 26: Close the meshing solenoid valve and the air release solenoid valve, and return to Step 22 after 4 seconds of closing the meshing solenoid valve and the air release solenoid valve;

[0046] Step 27: Generate a fault signal and end. Specifically, Step 25, Step 26 and Step 27 can effectively reduce the rubbing between the driving gear of the barring gear and the rotor gear of the steam turbine caused by inappropriate relative positions, and timely remind relevant operators to perform equipment maintenance when the barring gear is repeatedly input without success.

[0047] Further, after the barring gear is engaged, when the speed of the large gear of the steam turbine is greater than the speed of the driving gear of the barring gear, the method for controlling the barring gear handle to be in the non-working position to disengage the large gear of the steam turbine from the driving gear of the barring gear and stop the supply of barring gear lubricating oil includes:

[0048] When the speed of the large gear of the steam turbine is greater than the speed of the driving gear of the barring gear, the driving gear of the barring gear is automatically disengaged from the large gear of the steam turbine;

[0049] After the driving gear of the barring gear is automatically disengaged, turn off the motor. After turning off the motor for 2 seconds, open the disengaging solenoid valve to make the handle in the non-working position; close the disengaging solenoid valve 5 seconds after the disengaging solenoid valve is opened;

[0050] Obtain the current speed of the steam turbine rotor, and stop the supply of barring gear lubricating oil when the current speed of the steam turbine rotor is greater than the second speed setting value.

[0051] Specifically, after the steam turbine is started, when the spindle speed of the steam turbine is greater than the barring gear speed, the barring gear can be automatically tripped, and the barring gear device is in the non-engaged state. At this time, the barring gear handle needs to be pushed to the non-working position, and at the same time, the oil injection solenoid valve is closed to stop the supply of barring gear lubricating oil.

[0052] Further, after the barring gear is engaged and when the barring gear needs to be disengaged actively, the method of controlling the barring gear handle to be in a non-operating position to disengage the large steam turbine gear from the barring gear driving gear and stop the supply of barring gear lubricating oil includes:

[0053] Start the motor and reverse it. After the motor reverses for 2 seconds, open the disengaging solenoid valve to disengage the large steam turbine gear from the barring gear driving gear with the handle in the non-operating position; close the disengaging solenoid valve 5 seconds after the disengaging solenoid valve is opened;

[0054] Obtain the current speed of the steam turbine rotor, and stop the supply of barring gear lubricating oil when the current speed of the steam turbine rotor is greater than the second speed setting value.

[0055] Specifically, after the barring gear of the steam turbine is engaged and when the barring gear needs to be overhauled, the barring gear needs to be disengaged from the steam turbine rotor gear. At this time, the barring gear handle needs to be pushed to the non-operating position to disengage the large steam turbine gear from the barring gear driving gear, close the fuel injection solenoid valve, and stop the supply of barring gear lubricating oil; in actual operation, in order to save energy, the staff can also turn off the barring gear motor according to the actual situation after the barring gear is disengaged from the steam turbine rotor gear.

[0056] Further, the first speed setting value is 200 rpm.

[0057] Further, the second speed setting value is 2 rpm. Specifically, the state where the speed of the steam turbine rotor is less than 2 rpm is the zero-speed state.

[0058] Specifically, to control the engagement or disengagement of the barring gear, the barring gear handle needs to be pushed to the corresponding position.

[0059] Specific Embodiment 2: The following will combine the attached Figure 1 to the attached Figure 8 , describe this embodiment, and clearly and completely describe the technical solutions in the embodiments of the present invention:

[0060] A barring gear control device includes: a data acquisition module, a data processing module, a controller, and a human-machine interaction module;

[0061] The data acquisition module is used to obtain the rotor speed signal and barring gear soft start condition parameter signal after the steam turbine stops, and send the rotor speed signal and barring gear soft start condition parameter signal after the steam turbine stops to the data processing module;

[0062] The data processing module is used to determine whether the received rotor speed signal after the steam turbine stops is less than or equal to the set value of the first speed signal. If so, a pre-start signal is generated and sent to the controller; it is used to determine whether the received soft start condition parameter signal of the barring gear meets the corresponding set parameter signal to obtain a judgment result, and a barring gear engagement signal is generated according to the generated pre-start signal and the obtained judgment result, and the barring gear engagement signal is sent to the controller;

[0063] The controller is used to control the data acquisition module to obtain the soft start condition parameter signal of the barring gear according to the received pre-start signal; to control the engagement of the barring gear driving gear and the large gear of the steam turbine according to the received barring gear engagement signal;

[0064] The data acquisition module is also used to obtain the large gear speed signal of the steam turbine and the barring gear driving gear speed signal, and send the large gear speed signal of the steam turbine and the barring gear driving gear speed signal to the data processing module;

[0065] The data processing module determines whether the large gear speed of the steam turbine is greater than the barring gear driving gear speed according to the received large gear speed signal of the steam turbine and the barring gear driving gear speed signal. If so, a barring gear disengagement signal is generated and sent to the controller;

[0066] The human-machine interaction module is used to generate a barring gear active disengagement signal and send the barring gear active disengagement signal to the controller;

[0067] The controller is also used to control the disengagement of the barring gear driving gear and the large gear of the steam turbine according to the received barring gear disengagement signal or barring gear active disengagement signal, and stop the supply of barring gear lubricating oil.

[0068] Furthermore, the data processing module and the controller adopt an RS flip-flop digital logic circuit.

[0069] Furthermore, a barring gear control device is characterized in that it further includes a housing and an indicator light; a controller is arranged inside the housing;

[0070] The indicator light includes a first indicator light, a second indicator light and a third indicator light; the first indicator light is used to receive the barring gear engagement signal generated by the data processing module and emit light according to the barring gear engagement signal; the second indicator light is used to receive the barring gear disengagement signal generated by the data processing module and emit light according to the barring gear disengagement signal; the third indicator light is used to receive the barring gear active disengagement signal generated by the human-machine interaction module and emit light according to the barring gear active disengagement signal.

[0071] Specifically, the data processing module and the controller are the main core parts of the barring gear control device; the data processing module and the controller adopt an RS flip-flop digital logic circuit and a reset state priority mode, that is: Set state: When the input terminal S of the RS flip-flop is at high level (HIGH, 1) and R is at low level (LOW, 0), the flip-flop enters the set state. At this time, the output terminal Q of the flip-flop is at high level; Reset state: When the input terminal R of the RS flip-flop is at high level (HIGH, 1), the flip-flop enters the reset state. At this time, the output terminal Q of the flip-flop is at low level; When Q is at high level (HIGH, 1), it is regarded as start permission.

[0072] As Figure 5 shown, the data processing module includes a first comparator, a second comparator, a third comparator, a fourth comparator, a first NOT gate circuit, a second NOT gate circuit, a third NOT gate circuit, a fourth NOT gate circuit, an OR gate circuit, and an RS flip-flop;

[0073] The barring gear soft start condition parameter signals include the barring gear lubricating oil pressure signal, the barring gear jacking oil pressure signal, the steam turbine rotor speed signal, and the barring gear motor end cover opening and closing signal;

[0074] The first comparator is used to judge whether the received rotor speed signal after the steam turbine stops is less than or equal to the first speed signal set value. If so, it generates a high-level pre-start signal and inputs the high-level pre-start signal to the input terminal S of the RS flip-flop;

[0075] The second comparator is used to judge whether the barring gear lubricating oil pressure signal is within the lubricating oil pressure set range. If so, it generates a high-level lubricating oil pressure normal signal and inputs the high-level lubricating oil pressure normal signal to the input terminal of the first NOT gate circuit;

[0076] The third comparator is used to judge whether the barring gear jacking oil pressure signal is within the jacking oil pressure set range. If so, it generates a high-level jacking oil pressure normal signal and inputs the high-level jacking oil pressure normal signal to the input terminal of the second NOT gate circuit;

[0077] The fourth comparator is used to judge whether the steam turbine rotor speed signal is less than the second speed set value. If so, it generates a high-level steam turbine rotor speed normal signal and inputs the high-level steam turbine rotor speed normal signal to the input terminal of the third NOT gate circuit;

[0078] The fifth comparator is used to judge whether the barring gear motor end cover is closed according to the barring gear motor end cover opening and closing signal. If so, it generates a high-level barring gear motor end cover normal signal and inputs the high-level barring gear motor end cover normal signal to the input terminal of the fourth NOT gate circuit;

[0079] The first NOT gate circuit, the second NOT gate circuit, the third NOT gate circuit, and the fourth NOT gate circuit are used to convert the input high-level signal into a low-level signal, and transmit the converted low-level signals to the first input terminal, the second input terminal, the third input terminal, and the fourth input terminal of the OR gate circuit respectively; the OR gate circuit is used to generate a low-level second pre-start signal according to the input low-level lubricating oil pressure normal signal, low-level turning gear oil pressure normal signal, low-level steam turbine rotor speed normal signal, and low-level turning gear motor end cover normal signal, and input the low-level second pre-start signal to the input terminal R of the RS flip-flop;

[0080] The RS flip-flop is used to generate a high-level turning gear engaged signal according to the high-level pre-start signal received by the input terminal S and the low-level second pre-start signal received by the input terminal R, and input the high-level turning gear engaged signal to the controller;

[0081] When the steam turbine rotor speed drops to the first speed setting value, the controller controls the fuel injection solenoid valve to start, so that the lubricating oil enters the turning gear;

[0082] As Figure 6 shown, the action instruction of the engaging solenoid valve adopts the RS flip-flop digital logic circuit and the reset state priority mode; the setting (S) condition is the engaging state of the turning gear device, and the rotor speed is less than the second speed setting value, and there is a start instruction, and the start instruction can be automatically issued by the turning gear device controller, or the operator operates locally, or a remote control instruction; the reset (R) condition is any one of the following: speed limit exceeded, start permission condition not met, turning gear has been running for more than 5 seconds, failure to engage successfully 12 seconds after the engaging instruction is issued, and failure to engage successfully 45 seconds after the remote start instruction is issued;

[0083] The action instruction of the air release solenoid valve is the same as that of the engaging solenoid valve;

[0084] As Figure 7 shown, the action instruction of the disengaging solenoid valve includes: a) automatically energized for 2 s when starting the automatic engagement process; b) adopting the RS flip-flop digital logic circuit and the reset state priority mode. The setting (S) condition is that when in the turning gear state, a disengagement instruction is received, and the reset (R) condition is that the action instruction of the disengaging solenoid valve is delayed for 5 s. The logical relationship between a) and b) is OR;

[0085] Turning gear motor stop instruction: The turning gear motor stop instruction is triggered when any of the following conditions occurs: the rotor speed is not less than the second speed setting value and the turning gear device is not in the engaged state, the start permission instruction disappears, the remote stop instruction, the local stop instruction, and the turning gear device is not in the engaged state 45 seconds after the remote start instruction is issued;

[0086] As Figure 8As shown in the figure, the barring motor start command: an RS flip-flop digital logic circuit is adopted, and the reset state priority mode is adopted. The set (S) condition is that the rotor speed is zero speed and there is a start command. This start command can be a cyclic command automatically issued by the barring device controller, or an on-site operation by the operator, or a remote control command, or the barring device is in the engaged state 45 seconds after the remote start command is issued; the reset (R) condition is the barring motor stop command. The barring motor start command is a 1-second pulse;

[0087] Cyclic command: an intermediate process variable, which is a marking point for the remote start command to cycle the automatic engagement process logic when the controller is in the soft start mode, the rotor speed is less than the second speed setting value, and the barring device is in the non-engaged state.

[0088] Motor reverse: When the controller receives the on-site disengagement command, the barring device is in the engaged state, and the barring current is less than 1A, the motor reverse command is triggered.

[0089] Furthermore, the controller is controlled in any one of the on-site, DCS remote, and automatic modes.

[0090] When the on-site automatic control mode of the controller is selected, if the soft start permission conditions are met, that is, the barring lubricating oil pressure is within the lubricating oil pressure setting range, the barring jacking oil pressure is within the jacking oil pressure setting range, the steam turbine rotor speed is less than the second speed setting value, and the barring motor end cover is locked, the barring device controller automatically issues a start command to start the barring automatic input process.

[0091] When the on-site manual control mode of the controller is selected, if the permission conditions are met, that is, the barring lubricating oil pressure is within the lubricating oil pressure setting range, the barring jacking oil pressure is within the jacking oil pressure setting range, the steam turbine rotor speed is less than the second speed setting value, and the barring motor end cover is locked, select the "Barring Input" button through the operation panel of the barring device controller to start the barring input process. When the barring is input, the "Barring Withdrawal" button can be selected through the operation panel of the barring device controller to start the barring withdrawal process. At the same time, the operator can monitor and customize some common parameters such as time control, input inversion control, and control mode selection through the operation panel of the barring device controller to meet the needs of on-site testing and debugging.

[0092] When the DCS remote control mode of the controller is selected, the barring device controller receives the DCS "Barring Input" control command to start the barring input process and can cycle through the automatic engagement process. When the barring is input, it can receive the DCS "Barring Withdrawal" control command to start the barring withdrawal process.

[0093] Although the present invention has been described herein with reference to particular embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Accordingly, it should be understood that numerous modifications may be made to the exemplary embodiments, and other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a separate embodiment may be used in other described embodiments.

Claims

1. A turning gear control method, characterized in that: include: Turning gear input control method and turning gear exit control method; The control methods of turning gear input include: Step 1: Obtain the rotor speed of the steam turbine after it is shut down, and when the rotor speed of the steam turbine drops to a first speed setting value, allow lubricating oil to enter the turning gear; Step 2: Obtain the cranking gear soft start condition parameters, and determine whether the cranking gear soft start condition parameters meet the corresponding set parameters. If so, control the cranking gear handle to be in the working position so that the turbine large gear meshes with the cranking gear driving gear, and the cranking gear is put into the turbine; The cranking exit control methods include: After the turning gear is put into operation, when the speed of the turbine large gear is greater than that of the turning gear driving gear or the turning gear needs to be actively exited, the turning gear handle is controlled to the non-working position to disengage the turbine large gear from the turning gear driving gear and stop the turning gear lubricating oil supply.

2. A turning gear control method according to claim 1, characterized in that: The cranking soft start condition parameters include cranking lubricating oil pressure, cranking top shaft oil pressure, turbine rotor speed and whether the cranking motor end cover is locked; Judging whether the cranking gear soft start condition parameters meet the corresponding set parameters includes: simultaneously judging whether the cranking gear lubricating oil pressure is within the lubricating oil pressure setting range, whether the cranking gear top shaft oil pressure is within the top shaft oil pressure setting range, whether the turbine rotor speed is less than the second speed setting value and whether the cranking gear motor end cover is locked; if the cranking gear lubricating oil pressure is within the lubricating oil pressure setting range, the cranking gear top shaft oil pressure is within the top shaft oil pressure setting range, the turbine rotor speed is less than the second speed setting value and the cranking gear motor end cover is locked, then the cranking gear soft start condition parameters meet the corresponding set parameters.

3. A turning gear control method according to claim 2, characterized in that: The method of controlling the turning gear handle to be in the working position so that the turbine gear meshes with the turning gear driving gear includes: Step 21: Set the input times threshold, set the input times i=1; Step 22: Open the turning gear disengagement solenoid valve; the turning gear disengagement solenoid valve is opened to put the turning gear handle in the non-working position, and the turning gear driving gear is disengaged from the turbine large gear; the starting motor is turned off after 1 second, so that the turning gear driving gear rotates at the initial speed; Step 23: 2 seconds after the motor is turned off, start the engagement solenoid valve and the bleed solenoid valve of the turning gear. After starting the engagement solenoid valve and the bleed solenoid valve, check at a set interval whether the turning gear driving gear is engaged with the large gear of the steam turbine and whether the engagement limit switch is closed. If the turning gear driving gear is engaged with the large gear of the steam turbine and the engagement limit switch is closed, go to step 24, otherwise go to step 25; the engagement solenoid valve and the bleed solenoid valve are opened at the same time to put the turning gear handle in the working position; the engagement limit switch is used to close after the turning gear driving gear is engaged with the large gear of the steam turbine; Step 24: Start the motor to make the cranking driving gear reach the rated speed; after the cranking driving gear reaches the rated speed, close the meshing solenoid valve and the bleed solenoid valve after an interval of 10 seconds and end; Step 25: Set the number of inputs i=i+1, and determine whether the number of inputs i is greater than or equal to the number of inputs threshold. If so, go to step 27; if the number of inputs i is less than the set number of inputs threshold, go to step 26; Step 26: close the engagement solenoid valve and the deflation solenoid valve, and return to step 22 after closing the engagement solenoid valve and the deflation solenoid valve for 4 seconds; Step 27: Generate a fault signal and end.

4. A turning gear control method according to claim 3, characterized in that: After the turning gear is put into operation, when the speed of the turbine's large gear is greater than the speed of the turning gear's driving gear, the turning gear handle is controlled to be in the non-working position to disengage the turbine's large gear from the turning gear's driving gear. The methods for stopping the turning gear's lubricating oil supply include: When the speed of the turbine's large gear is greater than that of the cranking gear, the cranking gear and the turbine's large gear will automatically disengage. After the turning gear is automatically disengaged, the motor is turned off. 2 seconds after the motor is turned off, the disengagement solenoid valve is opened to put the handle in the non-working position; the disengagement solenoid valve is closed after 5 seconds of opening; The current speed of the turbine rotor is obtained, and when the current speed of the turbine rotor is greater than the second speed setting value, the cranking lubricating oil supply is stopped.

5. A turning gear control method according to claim 4, characterized in that: After the cranking gear is put into operation, when the cranking gear needs to be automatically withdrawn, the cranking gear handle is controlled to be in the non-working position to disengage the turbine gear from the cranking gear driving gear. The method of stopping the cranking gear lubricating oil supply includes: Start the motor and reverse it. After the motor reverses for 2 seconds, open the disengagement solenoid valve, so that the handle is in the non-working position and the turbine large gear is disengaged from the turning gear. After the disengagement solenoid valve is opened for 5 seconds, close it. The current speed of the turbine rotor is obtained, and when the current speed of the turbine rotor is greater than the second speed setting value, the cranking lubricating oil supply is stopped.

6. A turning gear control method according to claim 1, characterized in that: The first speed setting value is 200 rpm.

7. A turning gear control method according to claim 2, characterized in that: The second speed setting value is 2 rpm.

8. A turning gear control device, characterized in that: include: Data acquisition module, data processing module, controller and human-computer interaction module; The data acquisition module is used to obtain the rotor speed signal and the cranking soft start condition parameter signal after the steam turbine is shut down, and send the rotor speed signal and the cranking soft start condition parameter signal after the steam turbine is shut down to the data processing module; The data processing module is used to determine whether the received rotor speed signal of the steam turbine after shutdown is less than or equal to the first speed signal setting value, and if so, generate a pre-start signal, and send the pre-start signal to the controller; determine whether the received cranking soft start condition parameter signal meets the corresponding setting parameter signal to obtain a judgment result, and generate a cranking input signal according to the generated pre-start signal and the obtained judgment result, and send the cranking input signal to the controller; The controller is used to control the data acquisition module to obtain the cranking gear soft start condition parameter signal according to the received pre-start signal; and control the cranking gear driving gear to mesh with the turbine gear according to the received cranking gear input signal; The data acquisition module is also used to obtain the speed signal of the steam turbine gear and the speed signal of the cranking gear driving gear, and send the speed signal of the steam turbine gear and the speed signal of the cranking gear driving gear to the data processing module; The data processing module determines whether the speed of the steam turbine gear is greater than the speed of the cranking gear according to the received steam turbine gear speed signal and the cranking gear driving gear speed signal. If so, a cranking gear disengagement signal is generated and the cranking gear disengagement signal is sent to the controller; The human-machine interaction module is used to generate a turning gear active exit signal and send the turning gear active exit signal to the controller; The controller is also used to control the disengagement of the turning gear driving gear from the turbine large gear and stop the supply of turning gear lubricating oil according to the received turning gear disengagement signal or the turning gear active exit signal.

9. A turning gear control device according to claim 8, characterized in that: The data processing module and controller use RS trigger digital logic circuit.

10. A turning gear control device according to claim 8, characterized in that: The controller is controlled by any of the following methods: local, remote distributed control system, or automatic.

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