CN218816562U

CN218816562U - Low-consumption multi-control-mode barring control system

Info

Publication number: CN218816562U
Application number: CN202222934516.6U
Authority: CN
Inventors: 徐凯宏; 赵曈; 冯晓; 王灿; 刘超
Original assignee: Northeast Forestry University
Current assignee: Northeast Forestry University
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-04-07
Anticipated expiration: 2032-11-04

Abstract

The utility model discloses a steam turbine unit is with low consumption multi-control mode barring control system relates to automated control technical field, including central control system, data feedback system, human-computer interaction system, executive motor and device etc.. By collecting parameters such as shafting rotating speed, oil pressure and the like of the steam turbine set, when the shafting rotating speed of the set is zero, the jigger is automatically engaged and drives the set, and after the set is started, the jigger is automatically disengaged; when the unit stops, the shafting idles, the low-consumption multi-control mode barring control system does not need to overcome the impact of static friction force at the moment, and the shafting is dynamically engaged and driven to barring; when the barring has operation which does not accord with the regulation, an alarm device in the man-machine interaction system sends out an acousto-optic alarm signal, and simultaneously, the picture display of a monitoring touch screen can be controlled to remind an operator of failure in the barring throwing; the control system has 6 control modes, and a user can select a more appropriate control mode. The overall automatic control level of the steam turbine set is improved.

Description

Low-consumption multi-control-mode barring control system

Technical Field

The utility model relates to an automatic control technical field, concretely relates to steam turbine unit is with low consumption multi-control mode barring control system.

Background

The barring device is a device for driving a rotor of a turbo generator unit to rotate by using a motor, is a driving device for driving a shaft system to rotate before the turbo generator unit is started and after the turbo generator unit is stopped, and is a device for ensuring that the rotor of the turbo generator can be uniformly heated or cooled before the turbo generator unit is started or after the turbo generator unit is stopped.

The electric automation control system is an important component for guaranteeing the running, the function and the equipment safety of the car turning machine. With the development of wireless communication technology, the control of the barring gear is gradually changed from a manual control method by an operator to a remote control method. The problems of the current control system of the turning gear include: a manual or relay control logic circuit is used for turning over the automobile, so that the overall automatic control level of the steam turbine set is not high enough; when the steam turbine unit is stopped, the impact of static friction force needs to be overcome to perform barring, so that shafting bending is easy to cause; the state of the vehicle driver cannot be monitored in real time at a long distance, and relevant parameters in the running process of the vehicle driver are not uploaded to a cloud terminal, so that data are not convenient to store and share; the control modes of the jigger are few, and the suitable occasions are few.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a low-consumption multi-control mode turning control system for a steam turbine unit, which is implemented by a programmable logic controller PLC.

The utility model discloses a low consumption multi-control mode barring control system for turboset, its characterized in that is introduced: the PLC programmable control replaces a manual or relay control logic circuit, and the control system can enter a full-automatic control mode after receiving a zero-rotation-speed signal without manual intervention, so that the overall automatic control level of the steam turbine set is improved; when the steam turbine unit stops, the shafting is lazed, but the control system does not need to overcome the impact of static friction force at the moment, and can be dynamically engaged and drive the shafting to be turned; by using remote control, when the barring machine does not meet the specified operation, the alarm device in the human-computer interaction system sends out an audible and visual alarm signal, and simultaneously can control and monitor the picture display of the touch screen to remind an operator of failure in the barring machine, and can realize the storage and sharing of related data such as operating parameters and the like when the barring machine works; the barring machine control system has 6 control modes in total, is suitable for a plurality of machine sets, and can select a more suitable control mode by a user.

In order to solve the problem existing in the background art, the utility model adopts the following technical scheme: a low-consumption multi-control mode turning control system is designed and comprises a central control system, a data feedback system, a man-machine interaction system, an execution motor, a device and other modules.

The low-consumption multi-control mode turning control system for the steam turbine set is characterized by comprising a central control system, a data feedback system, a man-machine interaction system, an execution motor and a device, wherein the central control system comprises a PLC (programmable logic controller), and the man-machine interaction system comprises an alarm device and a monitoring touch screen;

furthermore, the man-machine interaction system sends a command to the central control system, the data feedback system collects parameters on site through the execution motor and the device, the data feedback system feeds back temperature, pressure and speed signals to the central control system, the central control system feeds back collected system process parameters to the man-machine interaction system, the system operation state and accident alarm information can be displayed in a monitoring touch screen in the man-machine interaction system, and sound and light alarm is generated for a fault part to form closed-loop sampling control.

Furthermore, the data feedback system collects shafting rotating speed, oil pressure, engagement, disengagement and locking parameters of the turboset and transmits the parameters to the central control system, and the system controls the variable frequency starting of the locomotive motor through the soft starter to automatically engage and drive the turboset by judging whether the shafting rotating speed reaches zero or not, namely whether a zero rotating speed signal is received or not. After the steam turbine set is started, the system device judges whether a disengagement signal is received, and when the disengagement signal is received, the barring machine automatically disengages; when the steam turbine set stops, the shafting idles away, the data feedback system collects speed signals, shafting temperature and torque to form closed-loop collection, automatic frequency conversion control and adjustment are carried out, the low-consumption multi-control mode barring machine control system device can be dynamically connected and drives the shafting barring at the moment, the steam turbine set shafting cannot stop, the impact of static friction force does not need to be overcome, and the service life of the steam turbine set is prolonged.

In one embodiment, the barring machine system for the steam turbine unit can meet the requirements of pure manual input barring, zero-rotation-speed full-automatic input barring, quasi-manual input barring, inching input barring and emergency input barring, has the functions of low oil pressure protection, remote control and the like, and is simple and clear in wiring and convenient to maintain.

In one embodiment, in the starting mode of the local manual barring (purely manual input barring), when an external allowable barring condition is met, a button of 'electromagnetic valve action' on a local control cabinet is pressed, the electromagnetic valve is electrified to attract and generate a remote output signal, a barring contactor attracts, a barring motor is positively rotated through a soft starter, and a steam turbine starts to barring through a reduction gearbox; when the rotor of the steam turbine rotates in a rushing manner and the rotating speed of the rotor of the steam turbine exceeds the turning speed, the turning motor stops rotating forwards; once the condition that the turning gear cannot be turned off occurs, a 'turning gear' button on the local control cabinet can be directly pressed, and the turning gear motor stops rotating reversely.

In one embodiment, the local automatic barring (full automatic input barring) starting mode is that a TSI (turbine safety monitoring device) in a centralized control room sends a zero rotation speed signal to a barring control cabinet, and a PLC in the barring control cabinet automatically switches on an electromagnetic valve after confirming that the zero rotation speed signal is received, so that a hydraulic actuating mechanism is meshed with a turbine barring gear.

In one embodiment, the quasi-automatic input barring starting mode is that under the condition of power, when no zero rotating speed signal exists but the barring needs to be carried out, the barring gear can be directly meshed through a command, and the input barring is controlled quasi-automatically. The quasi-automatic control can be controlled locally or remotely.

In one embodiment, the quasi-manual turning-in starting mode is that under the condition of power, an operator can shake the handle to enable the turning gear to enter the meshing position, and the driver motor is commanded to be turned into the turning gear to realize quasi-manual control.

In one embodiment, the local inching barring starting mode is that an inching and input button on a local control cabinet is pressed, a barring contactor is electrified to attract, a barring indicator lamp is turned on, a barring motor rotates forwards, and a turbine can be barring through a reduction gearbox under the logical control of a PLC when a normal signal of a soft starter is input; and when the button is released, the barring contactor is powered off, and the inching function is realized.

The low-consumption multi-control mode barring control system is characterized by further comprising a local control cabinet, wherein the PLC, the human-computer interaction system, the alarm device and the monitoring touch screen are all arranged in the local control cabinet.

The utility model discloses the beneficial effect who brings is:

(1) The PLC is used for logic control, the original manual or relay contact control logic circuit is replaced for turning control, the control system can enter a full-automatic control mode after receiving a zero rotating speed signal, manual intervention is not needed, and the integral automatic control level of the steam turbine set is improved.

(2) When the steam turbine unit stops, the shaft system is lazed away, but the control system does not need to overcome the impact of static friction force at the moment, and can be dynamically engaged and drive the shaft system to be turned.

(3) By utilizing remote control, when the barring is not in accordance with the specified operation, the alarm device in the man-machine interaction system sends out an audible and visual alarm signal, and simultaneously, the picture display of the monitoring touch screen can be controlled to remind an operator of failure in barring throwing. Meanwhile, related data such as running parameters and the like of the turning gear during working are stored and shared, and when the running state of the turning gear is checked and analyzed subsequently or other working requirements exist, operators can track, search and share the data conveniently.

(4) The barring gear control system has 6 control modes in total, can adapt to a plurality of units, and can select a more appropriate control mode by a user.

Description of the drawings:

the accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a block diagram of a control system of a turning machine for a steam turbine unit;

FIG. 2 is a flow chart of a fully automatic control scheme of the low-consumption multi-control mode barring control system in one embodiment;

FIG. 3 is a flow chart of a control mode of the low-loss multiple control mode barring control system in one embodiment;

FIG. 4 is a schematic structural diagram of a turning gear for a rotor of a steam turbine set according to an embodiment;

fig. 5 is a schematic diagram of a front equipment layout of a local control cabinet in an embodiment.

Description of reference numerals:

110-central control system 120-data feedback system 130-man-machine interaction system

140-actuating motor and device 150-PLC controller 160-alarm device

170-monitoring the touch Screen

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In one embodiment, a low-consumption multi-control mode barring control system is provided, suitable for a steam turbine set rotor barring control. As shown in fig. 1, the turning gear control system of the steam turbine set includes a central control system 110, a data feedback system 120, a human-computer interaction system 130, an actuating motor and a device 140. Wherein the central control system 110 comprises a PLC controller 150, and the human-computer interaction system 130 comprises an alarm device 160 and a monitoring touch screen 170. The man-machine interaction system 130 sends a command to the central control system 110, the data feedback system 120 collects parameters on site through the execution motor and the device 140, the data feedback system 120 feeds back temperature, pressure and speed signals to the central control system 110, the central control system 110 feeds back collected system process parameters to the man-machine interaction system 130, the system operation state and accident alarm information can be displayed in a monitoring touch screen 170 in the man-machine interaction system 130, and sound-light alarm is generated in the alarm device 160 for a fault part to form closed-loop sampling control.

Wherein, the data feedback system 120 collects the shafting rotation speed, oil pressure, engagement, disengagement and locking parameters of the steam turbine set and transmits the parameters to the central control system 110. As shown in fig. 2, the system controls the variable frequency start of the in-vehicle machine motor through the soft starter by judging whether the zero rotating speed signal is received or not when the rotating speed of the shafting reaches zero, and automatically engages and drives the steam turbine set. After the steam turbine set is started, the system device judges whether a disengagement signal is received, and when the disengagement signal is received, the barring machine automatically disengages; when the steam turbine set stops, the shafting idles away, the data feedback system 120 collects speed signals, shafting temperature and torque to form closed-loop collection, automatic frequency conversion control and adjustment are carried out, the low-consumption multi-control mode barring control system device can be dynamically connected and drives the shafting barring at the moment, the steam turbine set shafting cannot stop, the impact of static friction force does not need to be overcome, and the service life of the steam turbine set is prolonged.

The soft starter is an imported Schneider motor soft starter, so that the impact on a turning motor and a turbine turning gear is reduced, the turning motor is subjected to perfect overcurrent, overheat, overvoltage, undervoltage and low-power protection, the possible damage of accidents to the turning motor is prevented, and the technological requirement of stable and accurate turning is met.

The PLC controller 150 is implemented by using a modular tsx series programmable controller (PLC) of schneider electric (china) investment limited company, instead of a conventional relay logic.

The PLC 150 transmits relevant data (such as lubricating oil pressure, top shaft oil pressure, fault indication and the like) existing in a data area of the data feedback system 120 and in the operation process of equipment to the ESP-01S WiFi chip in a serial port communication mode, and performs AT instruction setting on the ESP-01S module so as to control the ESP-01S WiFi module to be networked. And then the ESP-01S module is connected with the address and the port number of the specified cloud server and is communicated with the cloud server through a TCP protocol, and data is transmitted to the cloud server from the main control unit through a network in a transparent transmission mode or a non-transparent transmission mode, so that the data is recorded, stored and shared.

The monitoring touch screen 170 is connected and communicated with the PLC controller 150 through a network cable, and the communication interface is RJ45. The monitoring software MCGS is provided, the rolling stock operation picture can be displayed, the historical trend can be stored, and the hard disk storage capacity can meet the 24-month operation requirement. The monitoring touch screen 170 is also provided with configuration software, the PLC 150 can be configured, and the configuration software is a Chinese interface and supports a functional block diagram configuration mode.

The low-consumption multi-control-mode barring control system for the steam turbine unit comprises 6 control modes, is suitable for a plurality of units, and can select a more suitable control mode by a user, wherein the more suitable control mode comprises a pure manual control mode, a quasi-automatic control mode, a full-automatic control mode, a inching mode and an emergency mode. The oil-gas separator has the functions of low oil pressure protection, remote control and the like, and is simple and clear in wiring and convenient to maintain. As shown in fig. 3, wherein in the pure manual control mode: under the condition of power loss, an operator can drive the jigger to realize pure manual control through the hand wheel and the extension rod; in the quasi-manual control mode: under the condition of power supply, an operator can enable the barring gear to enter a meshing position by shaking the handle, and the motor is driven to be put into the barring gear by an instruction to realize quasi-manual control; in a quasi-automatic control mode: under the condition of power, when no zero rotating speed signal exists but the turning is needed, the turning gear can be meshed directly through an instruction, and the turning is put into to implement quasi-automatic control; in the full-automatic control mode: under the condition of power supply, when a zero rotating speed signal exists or not, full-automatic control is carried out without manual intervention; in the inching input barring mode: pressing the inching button can put in the barring, and loosening the button can turn off the barring contactor; in the emergency input barring mode: the turning gear input function can be directly realized to deal with emergency.

Further, in the starting mode of the local manual barring (purely manual input barring), when the external allowable barring condition is met, the 'electromagnetic valve action' button on the local control cabinet is pressed, the electromagnetic valve is electrified to be attracted, a remote output signal is generated, and the barring contactor is attracted. The PLC in the local control cabinet starts to detect whether a meshing in-place signal is received or not 30 seconds after the electromagnetic valve is electrified, and if the meshing in-place signal is not received, the PLC can generate a motor micro-artery pulse string to enable the barring motor to rotate forwards through the soft starter, so that the barring motor can slightly move, and meshing between gears is facilitated. If the meshing in-place signal is received at the moment, the motor is automatically started and the operation of the turning gear motor is maintained. But the meshing in-place signal is still not received after the micro-motion is carried out twice, the PLC can also send out a signal to enable the barring contactor to be sucked in forcibly, and meanwhile, the barring indicator light is turned on and generates a remote output signal. After the barring contactor is closed, the barring motor is rotated forward through the soft starter, and the steam turbine starts to be barring through the reduction gearbox. Meanwhile, after receiving a signal of actuation of the barring contactor, the PLC generates 5-second delay to automatically power off the electromagnetic valve, so that barring input is completed; when the rotor of the steam turbine rotates in a rushing mode, the rotating speed of the rotor of the steam turbine exceeds the rotating speed of the turning gear, the turning gear is automatically disengaged under the action of the overrunning clutch, the swing gear returns to a throwing-off position (sends a throwing-off in-place signal) and is self-locked, after the PLC receives the throwing-off in-place signal, the throwing-off in-place indicator lamp is turned on, a remote output signal is generated, an instruction is sent to disconnect the turning contactor, and the turning motor stops rotating forwards. In case the condition that the throw-away can not be performed appears, a 'throw-away' button on the local control cabinet can be directly pressed, under the condition that the internal logic of the PLC is met, the PLC can send a signal to enable the throw-away contactor to be attracted, the turning gear motor is enabled to rotate reversely through the soft starter, and after the PLC receives a throw-away in-place signal, an instruction is sent to enable the throw-away contactor to be powered off, and the turning gear motor stops rotating reversely. In addition, the internal position of the double-state control of the disc parking can be generated in the PLC as long as the 'disc parking' button on the local control cabinet is pressed down at any time, and the PLC can send out an instruction to enable the electromagnetic valve, the disc parking contactor and the like to be powered off and enable the disc parking motor to stop running, so that the disc parking is realized. The 'parking' button is an alternate switch under the condition that the engagement in-place signal is effective, so that the situation that the motor of the turning gear is automatically started again due to the fact that the 'parking' button is not thrown away or the engagement in-place signal still exists when the 'parking' button is loosened is prevented.

Further, in the starting mode of the local automatic barring (full-automatic input barring), a zero rotating speed signal is sent to a barring control cabinet by a TSI (steam turbine safety monitoring device) in a centralized control room, and a PLC (programmable logic controller) in the barring control cabinet automatically switches on an electromagnetic valve after confirming that the zero rotating speed signal is received, so that a hydraulic actuating mechanism is meshed with a steam turbine barring gear.

Further, the quasi-automatic input barring starting mode can directly engage the barring gear through an instruction when no zero rotating speed signal exists and the barring needs to be carried out under the condition of power supply, and the input barring is subjected to quasi-automatic control. The quasi-automatic control can be controlled locally or remotely.

Further, the quasi-manual turning-in starting mode is characterized in that under the power-on condition, an operator can shake the handle to enable the turning gear to enter the meshing position, and the driver motor is instructed to be input into the turning gear to realize quasi-manual control

Furthermore, the local inching barring starting mode is that a inching and input button on a local control cabinet is pressed, a barring touch device is electrified to attract through logic control of a PLC (programmable logic controller), a barring indicator lamp is turned on, a barring motor rotates forwards, and a steam turbine can be barring through a reduction gearbox when a normal signal of the soft starter is input; and when the button is released, the barring contactor is powered off, and the inching function is realized.

Further, the emergency entry barring actuation mode first presses a "solenoid valve actuation" button to attempt to complete the engagement. The working principle of the barring contactor after actuation is the same as that of a local manual barring mode, and repeated analysis is not needed.

The remote control barring mode has the advantages that the working principle of remote control is similar to that of local control, and the difference between the remote control barring mode and the local control barring mode is that a selection switch 'local/remote control' on a local control cabinet is pressed to a 'local control' position, so that the local control is prior, and the remote control is invalid; and the remote control position is touched to indicate that the remote control takes precedence and the local control is invalid. In addition, in the local control mode, input signals are sent from buttons and selector switches on the local control cabinet, and in the remote control panel car mode, these input signals are sent from the centralized control room instead.

As described in the background art, a control device of a turning machine for a steam turbine unit is a device for ensuring that a steam turbine rotor can be uniformly heated or cooled before starting or after stopping, and preventing serious accidents such as large shaft bending of the steam turbine rotor. Fig. 4 is a schematic structural diagram of a turning device for a rotor of a steam turbine set, wherein a large gear is a main gear, and a small gear is a turning small gear with a spiral slideway on the inner diameter. The reliable turning gear of the steam turbine is guaranteed to be crucial to the stable operation of the steam turbine, and is mainly embodied in the following 2 aspects:

1. before starting the steam turbine set, the barring is started, steam is generally supplied to the shaft seal, and the steam enters the cylinder to enable the temperature in the cylinder to be high and low, so that the rotor is prevented from being bent due to uneven heating.

2. The steam turbine set is turned after being shut down, residual steam still gathers in the cylinder, and the temperature of the upper cylinder is higher than that of the lower cylinder due to different heat dissipation conditions of the upper cylinder and the lower cylinder. To prevent the rotor from being bent and deformed due to uneven cooling of the rotor in this case.

The components in each system part of the low-consumption multi-control mode barring control system device for the steam turbine set are directly or indirectly electrically connected to achieve data transmission or interaction.

The local control cabinet in the low-consumption multi-control mode barring control system for the steam turbine set is provided with a front opening door and is designed for a wall-mounted box body. The front door panel is provided with a monitoring touch screen, a button, an indicator lamp and a selector switch, internal equipment of the cabinet is divided into an upper layer, a middle layer and a lower layer, the upper layer equipment is a PLC (programmable logic controller) and an I/O (input/output) module, the middle layer is a power supply conversion module and a relay, and the lower layer is a terminal strip. The front equipment arrangement of the local control cabinet is shown in fig. 5.

The above-described embodiments only represent preferred embodiments relating to a control system device of a turning gear for a steam turbine set, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A low-consumption multi-control mode barring control system for a steam turbine unit is characterized by comprising a central control system, a data feedback system, a man-machine interaction system, an execution motor and a device, wherein the central control system comprises a PLC (programmable logic controller), and the man-machine interaction system comprises an alarm device and a monitoring touch screen;

the system comprises a man-machine interaction system, a data feedback system, a central control system and a monitoring touch screen, wherein the man-machine interaction system sends a command to the central control system, the data feedback system acquires parameters on site through an execution motor and a device, the data feedback system feeds back temperature, pressure and speed signals to the central control system, the central control system feeds back the collected system process parameters to the man-machine interaction system, the monitoring touch screen in the man-machine interaction system can display system operation state and accident alarm information, and sound and light alarm is generated for a fault part to form closed-loop sampling control.

2. The system of claim 1, wherein the data feedback system collects shafting rotation speed, oil pressure, engagement, disengagement, and locking parameters of the steam turbine, and transmits the parameters to the central control system, the system controls the variable frequency start of the locomotive motor through the soft starter by determining whether the shafting rotation speed is zero, that is, whether a zero rotation signal is received, and automatically engages and drives the steam turbine, after the steam turbine is started, the system device determines whether a disengagement signal is received, and when a disengagement signal is received, the locomotive automatically disengages; when the steam turbine set stops, the shafting idles away, the data feedback system collects speed signals, shafting temperature and torque to form closed-loop collection, automatic frequency conversion control and adjustment are carried out, the low-consumption multi-control mode barring machine control system device can be dynamically connected and drives the shafting barring at the moment, the steam turbine set shafting cannot stop, the impact of static friction force does not need to be overcome, and the service life of the steam turbine set is prolonged.

3. The system of claim 2, wherein the system can meet the requirements of zero-speed full-automatic input jigger, quasi-manual input jigger, pure manual input jigger, inching input jigger and emergency input jigger, has low-oil-pressure protection and remote control functions, and is simple and clear in wiring and convenient to maintain.

4. The system of claim 3, wherein the quasi-automatic input turning starting mode is a turning starting mode, when no zero rotation speed signal exists and turning is required, the turning gear can be directly engaged through a command, the input turning is controlled quasi-automatically, and the quasi-automatic control can be controlled locally and remotely.

5. The system of claim 3, wherein the quasi manual turning on mode is a starting mode in which an operator can turn the turning gear into the engaged position by shaking the handle in the presence of power, and the quasi manual control is performed by commanding the driving motor to turn on the turning gear.

6. The low-consumption multi-control mode barring control system for the steam turbine unit according to any one of claims 4 and 5 is characterized by further comprising a local control cabinet, wherein the PLC, the human-computer interaction system, the alarm device and the monitoring touch screen are all arranged in the local control cabinet.

7. The system of claim 6, wherein the components of the system portion of the system apparatus are electrically connected directly or indirectly to realize data transmission or interaction.