Turning control system of steam turbine power unit

Abstract

The invention discloses a barring control system of a turbine power unit, and relates to the technical field of barring. An electric barring system adopted by an existing ship steam turbine device cannot increase the barring speed. The far-end main controller receives the power supply and then performs self-inspection, if self-inspection is abnormal, the far-end main controller enters a ringing reminding mode, if self-inspection is normal, the far-end main controller enters an idle state and sequentially scans the test turning key, the warm-up turning key and the shutdown turning key, and when a signal that the test turning key, the warm-up turning key or the shutdown turning key is pressed down is received, the far-end main controller starts the ringing reminding mode; entering a corresponding working mode, driving a relay in the local box body, realizing starting control of a motor in a turning mechanism, and further driving a steam turbine to rotate; and the controller is also used for collecting the running state in real time through the local controller, controlling the turning mechanism to stop running through the relay when the running state does not meet a preset value, entering a normal running state if the running state meets the preset value, and entering a ringing reminding mode when the normal running state meets a preset ending condition. The method is used for controlling the barring mechanism.

Description

Technical Field

[0001] This invention relates to the field of rotary locomotive technology. Background Technology

[0002] Steam turbine power units are the core of ship propulsion, and their operation directly affects the ship's navigation. The requirements for ship propulsion systems are as follows: Before starting a ship powered by a steam turbine, the turbine must be turned every 5-10 minutes using a turning gear to ensure even heating. After shutdown, the turbine must transition evenly from a hot to a cold state, so it must also be turned every 5-8 minutes using a turning gear, with each turn stopping the turbine rotor in a new position (generally by 120°). Currently, the electric turning gear systems used in ship steam turbine units only solve the problem of automatic rotation; they do not improve the speed or process of turning. Furthermore, existing automated turning gear systems are expensive and complex to maintain, limiting their widespread application.

[0003] Furthermore, traditional manual rotation control suffers from problems such as a limited number of measurement points, errors in manual recording, and long rotation time. Therefore, it is necessary to improve the performance of the manual rotation control system to meet the requirements of arbitrary measurement points and rapid, high-precision continuous rotation. This would give the system advantages such as strong practicality, high accuracy, high efficiency, and a more modern rotation method. Therefore, a solution that improves system performance is needed. Summary of the Invention

[0004] The purpose of this invention is to address the problem that the electric turning gear system currently used in marine steam turbine units only solves the problem of automatic rotation but cannot improve the turning speed. Therefore, this invention proposes a turning gear control system for steam turbine power units.

[0005] A turning gear control system for a steam turbine power unit, the system comprising a remote main control box and a local control box;

[0006] The remote main control box is located at the far end of the turning mechanism, while the local control box is located at the near end of the turning mechanism.

[0007] The remote control box includes a remote enclosure, a remote controller installed inside the remote enclosure, and test turntable buttons, warm-up turntable buttons, shutdown turntable buttons, and a bell embedded on the front surface of the remote enclosure.

[0008] The local control box includes a local enclosure and local controllers and relays installed inside the local enclosure;

[0009] The remote main controller receives power and performs a self-test. If the self-test is abnormal, it enters the ringing reminder mode. If the self-test is normal, it enters the idle state and sequentially scans the test turning gear button, warm-up turning gear button, and stop turning gear button. When it receives a signal that the test turning gear button, warm-up turning gear button, or stop turning gear button has been pressed, it enters the corresponding working mode, drives the relay in the local housing, realizes the start control of the motor in the turning gear mechanism, and then drives the turbine to rotate.

[0010] It is also used to collect the operating status feedback from the local controller in real time. When the operating status does not meet the preset value, the turning mechanism is stopped by controlling the relay. When the operating status meets the preset value, it enters the normal operating status. When the normal operating status meets the preset end condition, it enters the ringing reminder mode.

[0011] The local controller is used to collect the operating status of the steam turbine in real time and feed it back to the remote main controller. The operating status includes the operating status of the turning gear, the operating status of the steam turbine, and the operating status of the lubricating oil system that supplies oil to the steam turbine.

[0012] Preferably, the operating status of the turning gear includes the motor current of the turning gear; the operating status of the turbine includes the main shaft temperature of the turbine and the status of the clutch on the turbine; and the operating status of the lubricating oil system includes the lubricating oil pressure.

[0013] Preferably, the preset termination condition is a preset running time or a preset running temperature.

[0014] Preferably, the remote main control box also includes a clutch disengagement indicator, a low lubricating oil pressure indicator, a motor overload indicator, a system fault indicator, a turning motor working indicator, and a turning process end indicator.

[0015] The clutch disengagement indicator, low lubricating oil pressure indicator, motor overload indicator, system fault indicator, turning motor working indicator, and turning process end indicator are all embedded on the front surface of the remote housing.

[0016] The remote master controller is also used to control the clutch disengagement indicator light to illuminate when it receives a clutch disengagement status.

[0017] It is also used to control the low lubricating oil pressure indicator and the motor overload indicator to light up when the received lubricating oil pressure and motor current do not meet their respective preset values, and at the same time control the system fault indicator to light up.

[0018] It is also used to control the turning motor's working indicator light to illuminate when the motor inside the turning mechanism starts;

[0019] It is also used to control the indicator light to illuminate when the motor inside the turning mechanism is disconnected, thus ending the turning process.

[0020] Preferably, the remote control box also includes a temperature display button, a current display button, and a digital tube (1);

[0021] Temperature display button, current display button and digital tube (1) are all embedded on the front surface of the far end box;

[0022] The remote master controller is also used to receive the key signal of the temperature display key and trigger the digital tube (1) to display the spindle temperature; it is also used to receive the key signal of the current display key and trigger the digital tube (1) to display the motor current.

[0023] Preferably, the remote control box also includes a stop button;

[0024] The stop button is embedded in the front surface of the remote enclosure;

[0025] The remote master controller is also used to control the turning gear mechanism to stop running after receiving the button signal from the stop button.

[0026] Preferably, the remote main control box also includes a mute button.

[0027] The mute button is embedded in the front surface of the far-end cabinet;

[0028] The remote master controller is also used to clear the ringing reminder sound after receiving the button signal of the clear button.

[0029] Preferably, the test turning gear operation mode is as follows: the turning gear mechanism rotates forward, driving the turbine main shaft to rotate 4 / 3 revolutions, and then stops operating.

[0030] Preferably, the warm-up turning mechanism is as follows: the turning mechanism rotates forward, stops after 10 minutes, reverses after 10 seconds, stops after 2 minutes, and then rotates forward again after 10 seconds. This process is repeated alternately between forward and reverse rotation of the turning mechanism until the turning mechanism stops operating.

[0031] Preferably, the shutdown turning gear working mode is as follows: the turning gear mechanism rotates forward, stops after working for 30 minutes, reverses after stopping for 10 seconds, stops after reversing for 6 minutes, restarts rotating forward after stopping for 10 seconds, and the turning gear mechanism alternates between forward and reverse rotation in this process. Once the turbine temperature is detected to be below 50°C, the operation is stopped.

[0032] The beneficial effects of this invention are:

[0033] This invention features a remote main control box and a local control box. The remote main control box has buttons for testing the turning gear, warming up the turning gear, and stopping the turning gear. Pressing the corresponding button activates the corresponding operating mode. During operation, the local controller collects the turning gear's running status in real time and feeds it back to the remote main controller. If the running status is not within the preset values, the turning gear mechanism is stopped. When the preset values ​​are met, the termination condition is met, and an alarm sounds. Therefore, this invention can monitor motor current, spindle temperature, and turning gear motor current in real time, and also has functions such as bearing temperature, lubricating oil pressure, and turning gear motor current overload protection, improving the fast, high-precision, and continuous turning performance of the turning gear. Attached Figure Description

[0034] Figure 1 This is a state transition diagram for the barring operation;

[0035] Figure 2 For testing the turning gear status transition diagram;

[0036] Figure 3 This is a diagram showing the state transition during warm-up and rotation.

[0037] Figure 4 This is a diagram showing the status transition of the turning gear during shutdown.

[0038] Figure 5 This is a layout diagram of the remote main control box operation panel. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0041] Example:

[0042] A turning gear control system for a steam turbine power unit, the system comprising a remote main control box and a local control box;

[0043] The remote main control box is located at the far end of the turning mechanism, while the local control box is located at the near end of the turning mechanism.

[0044] The remote control box includes a remote enclosure, a remote controller installed inside the remote enclosure, and test turntable buttons, warm-up turntable buttons, shutdown turntable buttons, and a bell embedded on the front surface of the remote enclosure.

[0045] The local control box includes a local enclosure and local controllers and relays installed inside the local enclosure;

[0046] The remote main controller receives power and performs a self-test. If the self-test is abnormal, it enters the ringing reminder mode. If the self-test is normal, it enters the idle state and sequentially scans the test turning gear button, warm-up turning gear button, and stop turning gear button. When it receives a signal that the test turning gear button, warm-up turning gear button, or stop turning gear button has been pressed, it enters the corresponding working mode, drives the relay in the local housing, realizes the start control of the motor in the turning gear mechanism, and then drives the turbine to rotate.

[0047] It is also used to collect the operating status feedback from the local controller in real time. When the operating status does not meet the preset value, the turning mechanism is stopped by controlling the relay. When the operating status meets the preset value, it enters the normal operating status. When the normal operating status meets the preset end condition, it enters the ringing reminder mode.

[0048] The local controller is used to collect the operating status of the steam turbine in real time and feed it back to the remote main controller. The operating status includes the operating status of the turning gear, the operating status of the steam turbine, and the operating status of the lubricating oil system that supplies oil to the steam turbine.

[0049] Further defined, the operating status of the turning gear mechanism includes the motor current of the turning gear mechanism; the operating status of the turbine includes the main shaft temperature of the turbine and the status of the clutch on the turbine; the operating status of the lubricating oil system includes the lubricating oil pressure.

[0050] Further, the preset termination condition is either the preset running time or the preset running temperature.

[0051] The structure of the remote main control box is further defined below. The remote main control box also includes a clutch disengagement indicator, a low lubricating oil pressure indicator, a motor overload indicator, a system fault indicator, a turning motor working indicator, and a turning process end indicator.

[0052] The clutch disengagement indicator, low lubricating oil pressure indicator, motor overload indicator, system fault indicator, turning motor working indicator, and turning process end indicator are all embedded on the front surface of the remote housing.

[0053] The remote master controller is also used to control the clutch disengagement indicator light to illuminate when it receives a clutch disengagement status.

[0054] It is also used to control the low lubricating oil pressure indicator and the motor overload indicator to light up when the received lubricating oil pressure and motor current do not meet their respective preset values, and at the same time control the system fault indicator to light up.

[0055] It is also used to control the turning motor's working indicator light to illuminate when the motor inside the turning mechanism starts;

[0056] It is also used to control the indicator light to illuminate when the motor inside the turning mechanism is disconnected, thus ending the turning process.

[0057] The remote control box also includes temperature display buttons, current display buttons and digital tube (1);

[0058] Temperature display button, current display button and digital tube (1) are all embedded on the front surface of the far end box;

[0059] The remote master controller is also used to receive the key signal of the temperature display key and trigger the digital tube (1) to display the spindle temperature; it is also used to receive the key signal of the current display key and trigger the digital tube (1) to display the motor current.

[0060] The remote control box also includes a stop button;

[0061] The stop button is embedded in the front surface of the remote enclosure;

[0062] The remote master controller is also used to control the turning gear mechanism to stop running after receiving the button signal from the stop button.

[0063] The remote control box also includes a mute button.

[0064] The mute button is embedded in the front surface of the far-end cabinet;

[0065] The remote master controller is also used to clear the ringing reminder sound after receiving the button signal of the clear button.

[0066] Specifically, the layout of the remote main control box operation panel is as follows: Figure 5 As shown. The front panel contains a four-digit LED display (1) and multiple buttons and indicator lights. The human-machine interface module needs to display the current of the rotary lobe motor (range 0~10A±0.1A), the spindle temperature (0~150℃±2℃), and alarm information on the one hand, and detect the operator's operation of the case on the other hand. Among them, the motor current and spindle temperature are displayed on the LED display (1), and the program needs to convert the numbers into characters and light up the corresponding LED display.

[0067] The information from the remote master control box and the local control box is mainly divided into three categories: switch quantity detection, switch quantity output, and analog quantity detection. Switch quantity detection and output can be controlled by programming the GPIO pins of the microcontroller. Analog quantity measurement requires the use of the microcontroller's internal ADC module. The motor current and temperature values ​​sent from the local control box are 4-20mA analog current signals, which are converted into 0-3.3V voltage signals by an analog amplifier circuit. After conversion, the digital quantities converted by the ADC can be converted into the actual measured physical quantities.

[0068] The following further defines three working modes. The test turning gear working mode is: the turning gear mechanism rotates forward, driving the turbine main shaft to rotate 4 / 3 revolutions, and then stops operating.

[0069] Specifically, its state transition diagram is as follows: Figure 2 As shown. The test turning gear procedure requires the turbine main shaft to rotate approximately 4 / 3 of its revolutions. After entering the test turning gear procedure, the turning gear mechanism motor can rotate once it meets the operating conditions. At the same time, the rotation time is recorded. Based on the running speed of the turning gear motor, the time it takes for the main shaft to rotate approximately 4 / 3 of its revolutions is estimated. When this time is reached, the test procedure is completed.

[0070] Further defining the warm-up turning mechanism's operating mode is as follows: the turning mechanism rotates forward, stops after 10 minutes, reverses after 10 seconds, stops after 2 minutes, and then rotates forward again after 10 seconds. This process alternates between forward and reverse rotation until the turning mechanism stops operating.

[0071] Specifically, its state transition relationship is as follows: Figure 3 As shown. The warm-up turning mechanism requires rotating forward for 10 minutes, then stopping for 10 seconds, and then rotating in reverse for 2 minutes. This forward and reverse rotation should be repeated until the operator presses the stop button or the turning mechanism motor's operating conditions no longer meet the requirements.

[0072] Further specified, the turning mechanism rotates forward and stops after 30 minutes of operation. After a 10-second stop, the turning mechanism rotates in reverse and stops after 6 minutes of reverse rotation. After a 10-second stop, the turning mechanism starts rotating forward again. This process alternates between forward and reverse rotation of the turning mechanism. Once the temperature of the turning mechanism is detected to be below 50°C, operation is stopped.

[0073] Specifically, its state transition diagram is as follows: Figure 4 As shown. The shutdown turning gear requirement is to continuously turn the gear forward for 30 minutes, stop production for 10 seconds, and then turn it in reverse for 6 minutes, alternating between the two. The turning gear will automatically stop when the unit (steam turbine) temperature is below 50℃.

[0074] Working principle:

[0075] The state transition relationship of the barring application is as follows: Figure 1As shown. After the remote master control box is powered on, it will execute a self-test program. If it is abnormal, it will enter a ringing reminder state, the system abnormality indicator light will illuminate, and other working modes will be unavailable until the fault is resolved. If the self-test passes, the remote master control box will enter an idle state and perform a key scan. When the corresponding function key is pressed, it will enter the corresponding function mode: test turning gear, warm-up turning gear, and shutdown turning gear. After entering each of these working modes, the remote master control box will drive the relays in the local control box according to the program, thereby realizing the start and stop control of the turning gear motor. At the same time, the remote master control box will continuously query the operating status of the local control box: motor current, spindle temperature, clutch engagement switch, manual turning gear switch, and low lubricating oil pressure switch. If these information do not meet the turning gear program, the motor will be immediately commanded to stop running, the system will exit the working mode and enter the ringing reminder mode, and the reason for the abnormal exit will be displayed through the indicator light. If the status collected by the local control box always meets the turning gear running conditions, the turning gear process will run normally according to the program settings until the termination conditions are met, such as reaching a specific running time or a specific temperature. After the operation ends, it will enter the bell reminder mode. The indicator light will show that the turning gear program has been completed. Press the confirmation button to cancel the bell, and the turning gear mechanism will enter the idle mode to wait for other tasks.

[0076] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A turning gear control system for a steam turbine power unit, characterized by, The system comprises a remote master control box and an on-site control box; The remote master control box is located at the far end of the turning gear mechanism, and the on-site control box is located at the near end of the turning gear mechanism; The remote master control box comprises a remote box body, a remote master controller arranged in the remote box body, and a test turning key, a warming turning key, a shutdown turning key and a bell embedded on the front surface of the remote box body; The on-site control box comprises an on-site box body, an on-site controller and a relay arranged in the on-site box body; The remote master controller is configured to, after receiving a power supply, perform self-checking, enter a bell reminding mode if the self-checking is abnormal, enter an idle state if the self-checking is normal, and sequentially scan the test turning key, the warming turning key and the shutdown turning key, and enter a corresponding working mode when receiving a signal that the test turning key, the warming turning key or the shutdown turning key is pressed, drive the relay in the on-site box body, and realize the starting control of the motor in the turning gear mechanism, thereby driving the steam turbine to rotate. The remote master controller is further configured to collect the running state fed back by the on-site controller in real time, stop the turning gear mechanism from running through the relay when the running state does not meet a preset value, enter a normal running state when the running state meets the preset value, and enter the bell reminding mode when the normal running state meets a preset end condition. The on-site controller is configured to collect the running state of the steam turbine when rotating in real time and feed back to the remote master controller, wherein the running state comprises the running state of the turning gear mechanism, the running state of the steam turbine and the running state of the lubricating oil system for supplying oil to the steam turbine.

2. A turning gear control system for a steam turbine power unit as claimed in claim 1, characterised in that, The running state of the turning gear mechanism comprises the motor current of the turning gear mechanism; the running state of the steam turbine comprises the main shaft temperature of the steam turbine and the state of the clutch on the steam turbine; and the running state of the lubricating oil system comprises the lubricating oil pressure.

3. A turning gear control system for a turbomachine power unit as claimed in claim 1, characterized in that The preset end condition is a preset running time or a running temperature.

4. A turning gear control system for a steam turbine power unit as claimed in claim 3, characterised in that, The remote master control box further comprises a clutch disengagement indicator light, a lubricating oil pressure low indicator light, a motor overload indicator light, a system fault indicator light, a turning motor working indicator light and a turning process end indicator light; The clutch disengagement indicator light, the lubricating oil pressure low indicator light, the motor overload indicator light, the system fault indicator light, the turning motor working indicator light and the turning process end indicator light are all embedded on the front surface of the remote box body; The remote master controller is further configured to control the clutch disengagement indicator light to light up when receiving the clutch disengagement state. The remote master controller is further configured to control the lubricating oil pressure low indicator light and the motor overload indicator light to light up respectively when receiving that the lubricating oil pressure and the motor current do not meet respective preset values, and control the system fault indicator light to light up at the same time. The remote master controller is further configured to control the turning motor working indicator light to light up when the motor in the turning gear mechanism starts. The remote master controller is further configured to control the turning process end indicator light to light up when the motor in the turning gear mechanism is disconnected.

5. A turning gear control system for a steam turbine power unit as claimed in claim 4, characterised in that, The remote master control box further comprises a temperature display key, a current display key and a number tube (1); The temperature display key, the current display key and the number tube (1) are all embedded on the front surface of the remote box body; The remote master controller is further configured to receive a key signal of the temperature display key and trigger the number tube (1) to display the main shaft temperature, and receive a key signal of the current display key and trigger the number tube (1) to display the motor current.

6. A turning gear control system for a steam turbine power unit as claimed in claim 5, characterised in that, The remote master control box further comprises a shutdown key. The stop button is embedded on the front surface of the remote box; The remote main controller is further configured to control the turning gear to stop running after receiving the key signal of the stop button.

7. A turning gear control system for a steam turbine power unit as claimed in claim 6, characterised in that, The remote main control box further comprises a clear button, The clear button is embedded on the front surface of the remote box; The remote main controller is further configured to clear the alarm sound after receiving the key signal of the clear button.

8. A turning gear control system for a turbomachine power unit according to claim 1, characterized in that, The test turning gear working mode is: the turning gear rotates forward, drives the steam turbine shaft to rotate for 4 / 3 turns, and then stops running.

9. A turning gear control system for a turbomachine power unit according to claim 1, characterized in that, The warming turning gear working mode is: the turning gear rotates forward, stops after 10 minutes, reverses after 10 seconds, stops after 2 minutes, rotates forward again after 10 seconds, and so on until the turning gear stops running.

10. A turning gear control system for a turbomachine power unit according to claim 1, characterized in that, The stop turning gear working mode is: the turning gear rotates forward, stops after 30 minutes, reverses after 10 seconds, stops after 6 minutes, rotates forward again after 10 seconds, and so on until the turning gear stops running.

Images