Coaxial water pump startup control method and device

Abstract

The present invention discloses a coaxial feedwater pump starting control method and device, which relate to the technical field of feedwater pump starting control. The method comprises: acquiring parameters of a steam turbine coaxially driven feedwater pump system in real time; judging whether the turbine starting conditions are met, and if so, controlling a speed control system to send a starting signal to the steam turbine; judging whether the coaxial feedwater pump starting conditions are met, and if so, sending a starting signal to the coaxial feedwater pump to control the coaxial feedwater pump to start; calling and executing a coaxial feedwater pump parallel pumping program; controlling the speed of the coaxial feedwater pump until the coaxial feedwater pump reaches the rated operating condition. The method can provide a more accurate and reasonable coaxial feedwater pump starting control logic, improve safety performance, increase the degree of automation of equipment operation, reduce manual operation, and avoid errors caused by manual operation.

Description

Technical Field

[0001] The present invention relates to the technical field of start-up control of a coaxial water supply pump, and in particular to a start-up control method and device for a coaxial water supply pump. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. No statement herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] Due to the complex mechanical structure of the steam turbine coaxial drive feedwater pump (hereinafter referred to as the coaxial feedwater pump), there is currently a lack of corresponding experience in the control method and device for the automatic start-up of the steam turbine coaxial drive feedwater pump. The degree of automation of the coaxial feedwater pump start-up and incorporation into the steam turbine coaxial drive feedwater pump system is still relatively low, and many steps are heavily dependent on manual operation by the operating personnel, which increases the harm of the coaxial feedwater pump to the boiler water supply disturbance during the operation of the coaxial feedwater pump, and also affects the safe and stable operation of the equipment and the steam turbine coaxial drive feedwater pump system. Summary of the Invention

[0004] An embodiment of the present invention provides a coaxial water supply pump startup control method, which is used to provide more accurate and reasonable startup control logic of the coaxial water supply pump, improve safety performance, increase the degree of automation of equipment operation, reduce manual operation, and avoid errors caused by manual operation.

[0005] A coaxial feedwater pump startup control method is applied to a controller; the controller is connected to a steam turbine coaxially driven feedwater pump system; the steam turbine coaxially driven feedwater pump system includes: a steam turbine, a speed control system, a feedwater pump system, and a boiler; the speed control system is respectively connected to the steam turbine and the feedwater pump system for adjusting the speed of the feedwater pump system; the steam turbine is used to drive the feedwater pump system; the feedwater pump system includes a coaxial feedwater pump and an electric feedwater pump connected to the coaxial feedwater pump; the coaxial feedwater pump and the electric feedwater pump are used to supply water to the boiler; the boiler is initially supplied with water by the electric feedwater pump.

[0006] The coaxial feedwater pump startup control method includes:

[0007] Real-time acquisition of load, operating status, and measurement point data of the steam turbine coaxial drive feedwater pump system;

[0008] Determine whether the operating state of the steam turbine coaxial drive feedwater pump system and the measurement data of the measuring points meet the steam turbine start-up conditions, and if so, control the speed control system to send a start signal to the steam turbine; the steam turbine start-up conditions include: the operating state of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than a first preset pressure, and the speed control system does not receive an alarm signal or a trip signal;

[0009] After the steam turbine is started, the operating state of the steam turbine coaxial drive feed water pump system and the measurement data of the measuring points are judged to determine whether they meet the coaxial feed water pump start-up conditions. If so, a start-up signal is sent to the coaxial feed water pump to control the coaxial feed water pump to start. The coaxial feed water pump start-up conditions include: the operating state of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than the second preset pressure, and the speed control system has not received an alarm signal or a trip signal;

[0010] After the coaxial feedwater pump is started, the coaxial feedwater pump paralleling program is called and executed according to the load, operating status and measurement data of the turbine coaxial drive feedwater pump system; the coaxial feedwater pump paralleling program is used to control the coaxial feedwater pump to replace the electric feedwater pump to supply water to the boiler;

[0011] According to the load of the steam turbine coaxial drive feed water pump system, the speed of the coaxial feed water pump is controlled until the coaxial feed water pump reaches the rated operating condition.

[0012] An embodiment of the present invention provides a coaxial water supply pump starting control device, which is used to provide more accurate and reasonable starting control logic of the coaxial water supply pump, improve safety performance, increase the degree of automation of equipment operation, reduce manual operation, and avoid errors caused by manual operation.

[0013] A coaxial feedwater pump starting control device is applied to a controller; the controller is connected to a steam turbine coaxially driven feedwater pump system; the steam turbine coaxially driven feedwater pump system includes: a steam turbine, a speed control system, a feedwater pump system, and a boiler; the speed control system is respectively connected to the steam turbine and the feedwater pump system for adjusting the speed of the feedwater pump system; the steam turbine is used to drive the feedwater pump system; the feedwater pump system includes a coaxial feedwater pump and an electric feedwater pump connected to the coaxial feedwater pump; the coaxial feedwater pump and the electric feedwater pump are used to supply water to the boiler; the boiler is initially supplied with water by the electric feedwater pump.

[0014] The coaxial water pump starting control device includes:

[0015] Acquisition module, used to obtain real-time measurement data of the load, operating status, and measurement points of the steam turbine coaxial drive feedwater pump system;

[0016] The steam turbine starting module is used to determine the operating status of the steam turbine coaxial drive feedwater pump system and whether the measurement data of the measuring points meet the steam turbine starting conditions. If so, it controls the speed control system to send a starting signal to the steam turbine. The steam turbine starting conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than a first preset pressure, and the speed control system has not received an alarm signal or a trip signal;

[0017] The coaxial feedwater pump starting module is used to determine whether the operating status of the coaxial drive feedwater pump system of the steam turbine and the measurement data of the measuring points meet the coaxial feedwater pump starting conditions after the steam turbine is started. If so, a starting signal is sent to the coaxial feedwater pump to control the coaxial feedwater pump to start. The coaxial feedwater pump starting conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than the second preset pressure, and the speed control system has not received an alarm signal or a trip signal;

[0018] The parallel pump module is used to call and execute the parallel pump program of the coaxial feedwater pump after the coaxial feedwater pump is started, based on the load, operating status and measurement data of the measuring point of the coaxial drive feedwater pump system of the steam turbine; the parallel pump program of the coaxial feedwater pump is used to control the coaxial feedwater pump to replace the electric feedwater pump to supply water to the boiler;

[0019] The control module is used to control the speed of the coaxial feedwater pump according to the load of the steam turbine coaxial drive feedwater pump system until the coaxial feedwater pump reaches the rated operating condition.

[0020] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned steam turbine coaxially driven feedwater pump startup control method when executing the computer program.

[0021] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned coaxial water supply pump startup control method is implemented.

[0022] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned coaxial water supply pump startup control method is implemented.

[0023] Compared with the prior art, the embodiment of the present invention obtains the load, operating status and measurement data of the measuring points of the coaxially driven water feed pump system of the steam turbine in real time; judges whether the operating status of the coaxially driven water feed pump system of the steam turbine and the measurement data of the measuring points meet the starting conditions of the steam turbine, and if so, controls the speed control system to send a starting signal to the steam turbine; the steam turbine starting conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than the first preset pressure, and the speed control system does not receive an alarm signal or a trip signal; after the steam turbine is started, judges whether the operating status of the coaxially driven water feed pump system of the steam turbine and the measurement data of the measuring points meet the starting conditions of the coaxial water feed pump, and if so, sends a starting signal to the coaxial water feed pump to control the starting of the coaxial water feed pump; the coaxial feed pump The water pump starting conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than the second preset pressure, and the speed control system has not received an alarm signal or a trip signal; after the coaxial feed water pump is started, the coaxial feed water pump parallel pump program is called and executed according to the load, operating status, and measurement data of the measuring point of the turbine coaxial drive feed water pump system; the coaxial feed water pump parallel pump program is used to control the coaxial feed water pump to replace the electric feed water pump to supply water to the boiler; according to the load of the turbine coaxial drive feed water pump system, the speed of the coaxial feed water pump is controlled until the coaxial feed water pump reaches the rated operating condition, which can provide a more accurate and reasonable coaxial feed water pump startup control logic, improve safety performance, improve the degree of automation of equipment operation, reduce manual operation, and avoid errors caused by manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0025] Figure 1 This is a flow chart of a coaxial water supply pump startup control method according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic structural diagram of a steam turbine coaxially driven feedwater pump system according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic structural diagram of a water supply pump system according to an embodiment of the present invention;

[0028] Figure 4 This is a flow chart of a specific example of a coaxial water supply pump startup control method according to an embodiment of the present invention;

[0029] Figure 5This is a schematic diagram of a first working mode of a speed regulation system in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of a second working mode of a speed control system in an embodiment of the present invention;

[0031] Figure 7 This is a flow chart of a specific example of a coaxial water pump parallel pumping procedure according to an embodiment of the present invention;

[0032] Figure 8 This is a structural block diagram of a coaxial water pump startup control device according to an embodiment of the present invention;

[0033] Figure 9 Schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] Embodiments of the present invention provide a start / stop control method for a coaxially driven feedwater pump of a steam turbine, a start / stop control device for a coaxially driven feedwater pump of a steam turbine, a computing device, a computer-readable storage medium, and a computer program product.

[0035] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0036] In view of the shortcomings of the prior art, the present invention proposes a coaxial feed water pump starting control method and device, which automatically controls the process of the coaxial feed water pump from starting and pumping to full load output, thereby achieving close and precise coordination of the coaxial feed water pump, the hydraulic coupling, hydraulic torque converter, hydraulic brake, diaphragm coupling and other components in the speed control system, and ensuring automatic and precise control of the speed control system during the entire process of switching between the first working mode and the second working mode. By applying the technical solution of the present invention, the cumbersome steps and possible misoperations of the operating personnel can be greatly reduced, the risk of starting the coaxial feed water pump to full load is reduced, and the automation level of the turbine coaxial drive feed water pump system is significantly improved, thereby ensuring the safe and stable operation of the coaxial feed water pump.

[0037] The startup control idea of ​​the coaxial feedwater pump of the present invention is as follows: (1) the electric feedwater pump is used to supply water to the boiler. After the turbine is at a constant speed, the coaxial feedwater pump has not yet started. When the startup conditions are met and manually confirmed, the coaxial feedwater pump can be automatically started by the controller, that is, the speed-up process is started. During this process, the water from the coaxial feedwater pump is returned to the deaerator through the recirculation pipe; (2) the speed of the coaxial feedwater pump is gradually increased, and after the outlet pressure P4 of the coaxial feedwater pump is increased to be basically consistent with the outlet pressure P5 of the electric feedwater pump, the pump operation is performed, the electric feedwater pump is withdrawn, and the coaxial feedwater pump is switched to supply water to the boiler. At this time, the coaxial feedwater pump operates in the hydraulic coupling mode; (3) as the load of the coaxial drive feedwater pump system of the turbine increases and the amount of water supplied to the boiler increases, the controller gradually increases the speed of the coaxial feedwater pump to the switching zone, and switches the working mode of the speed control system from the hydraulic coupling mode to the hydraulic torque converter mode; (4) as the load further increases, the controller continues to increase the speed of the coaxial feedwater pump until the rated water supply is reached.

[0038] In response to the above control ideas, an embodiment of the present invention provides a coaxial feed water pump startup control method, which automatically controls the coaxial feed water pump from startup and pumping to full load output, thereby achieving close and precise coordination of various components such as the steam turbine, coaxial feed water pump, hydraulic coupling, torque converter, hydraulic brake, diaphragm coupling, etc. in the speed control system, ensuring automatic and precise control of the entire process of switching between the first working mode and the second working mode of the speed control system, greatly reducing the cumbersome operating steps and possible misoperations of the operating personnel, reducing the risk of boiler water outage during the process of starting the coaxial feed water pump to full load, and significantly improving the automation level of the steam turbine coaxial drive feed water pump system, thereby ensuring the safe and stable operation of the steam turbine coaxial drive feed water pump system.

[0039] The coaxial feedwater pump startup control method provided in an embodiment of the present invention can be applied to a controller; the controller is connected to a steam turbine coaxially driven feedwater pump system; the steam turbine coaxially driven feedwater pump system includes: a steam turbine, a speed control system, a feedwater pump system, and a boiler; the speed control system is respectively connected to the steam turbine and the feedwater pump system, and is used to adjust the speed of the feedwater pump system; the steam turbine is used to drive the feedwater pump system; the feedwater pump system includes a coaxial feedwater pump and an electric feedwater pump connected to the coaxial feedwater pump; the coaxial feedwater pump and the electric feedwater pump are used to supply water to the boiler; the boiler is initially supplied with water by the electric feedwater pump.

[0040] Figure 1 FIG. 1 is a flow chart of a coaxial water supply pump startup control method according to an embodiment of the present invention. Figure 8 As shown, the coaxial water supply pump startup control method provided by the embodiment of the present invention may include:

[0041] S101, real-time acquisition of load, operating status, and measurement point data of the steam turbine coaxial drive feedwater pump system;

[0042] S102, determining whether the operating state of the steam turbine coaxially driven feedwater pump system and the measurement data of the measurement points meet the steam turbine startup conditions. If so, controlling the speed control system to send a startup signal to the steam turbine. The steam turbine startup conditions include: the operating state of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than a first preset pressure, and the speed control system has not received an alarm signal or a trip signal;

[0043] S103, after the steam turbine is started, determining whether the operating status of the steam turbine coaxial drive feedwater pump system and the measurement data of the measuring points meet the coaxial feedwater pump start-up conditions; if so, sending a start signal to the coaxial feedwater pump to control the coaxial feedwater pump to start; the coaxial feedwater pump start-up conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than a second preset pressure, and the speed control system has not received an alarm signal or a trip signal;

[0044] S104, after the coaxial feedwater pump is started, calling and executing a coaxial feedwater pump paralleling program based on the load, operating status, and measurement data of the turbine coaxial drive feedwater pump system; the coaxial feedwater pump paralleling program is used to control the coaxial feedwater pump to replace the electric feedwater pump to supply water to the boiler;

[0045] S105 , controlling the speed of the coaxial feedwater pump according to the load of the steam turbine coaxially driven feedwater pump system until the coaxial feedwater pump reaches a rated operating condition.

[0046] The coaxial feed water pump startup control method provided by the embodiment of the present invention can provide a more accurate and reasonable coaxial feed water pump startup control logic, while ensuring the safe operation of the turbine coaxial drive feed water pump system that uses the turbine coaxial drive feed water pump technology, improving the degree of automation of equipment operation, reducing manual workload, and avoiding errors that may be caused by manual judgment of equipment failures.

[0047] Before introducing the coaxial feedwater pump startup control method, the application scenario of the method is first introduced, namely the controller and the steam turbine coaxial drive feedwater pump system connected to the controller.

[0048] Figure 2 FIG. 1 is a schematic diagram of a steam turbine coaxially driven feedwater pump system according to an embodiment of the present invention. Figure 2 As shown, the steam turbine coaxial drive feedwater pump system mainly includes four subsystems: steam turbine, speed control system, feedwater pump system, boiler (not shown in the figure). In one embodiment, the coaxial feedwater pump stop control method provided by the embodiment of the present invention can be applied to Figure 2Middle controller 1; controller 1 is connected to the steam turbine coaxial drive feed water pump system; the speed control system is connected to the steam turbine and the feed water pump system respectively, and is used to adjust the speed of the feed water pump system; the steam turbine is used to drive the feed water pump system; the feed water pump system includes a coaxial feed water pump 9 and an electric feed water pump connected to the coaxial feed water pump; the coaxial feed water pump 9 and the electric feed water pump are used to supply water to the boiler; the speed control system may include: a torque converter 11, a disc brake 8, a hydraulic brake 12, and a hydraulic coupling 6; the shaft power of the steam turbine is divided into two shafts after being transmitted through the input end of the speed control system, one shaft is connected to the torque converter 11 and the hydraulic brake 12 in sequence; the other shaft is connected to the hydraulic coupling 6 and the disc brake 8 in sequence. The working oil in the working oil chamber is pressurized by the working oil pump and then sent to each solenoid valve and electro-hydraulic position controller through the working oil cooler, which is used to control the start and stop and adjustment of the hydraulic coupling, torque converter, etc.; the lubricating oil in the lubricating oil chamber is pressurized by the lubricating oil pump and then sent to the speed control system and each bearing of the coaxial water pump for lubrication and cooling of each bearing.

[0049] In one embodiment, Figure 2 and Figure 3 As shown, the speed control system may include: an input end gear set, a torque converter, a disc brake, a hydraulic brake, a planetary gear set, a lubricating oil pump, a working oil pump, a hydraulic coupling, an input shaft, an output shaft, a diaphragm coupling, and an interlocking brake unit; the water pump system may also include a coaxial water pump pre-pump, an electric water pump pre-pump, a deaerator, a coaxial water pump inlet electric door, a coaxial water pump outlet electric door, a coaxial water pump recirculation regulating valve, front and rear electric doors of the coaxial water pump recirculation regulating valve, an electric water pump inlet electric door, an electric water pump outlet electric door, an electric Dynamic feed water pump recirculation regulating valve, front and rear electric doors of electric feed water pump recirculation regulating valve, feed water main pipe; the steam turbine is coaxially connected to the input end gear set through the input shaft, and the shaft power of the steam turbine is divided into two shafts after being transmitted through the input end gear set. One shaft is connected to the working oil pump, torque converter, hydraulic brake, and planetary gear set in sequence; the other shaft is connected to the lubricating oil pump, hydraulic coupling, diaphragm coupling, planetary gear set, disc brake and output shaft in sequence; the interlocking brake unit is respectively connected to each device in the speed control system for maintenance of each device in the speed control system.

[0050] The output shaft of the speed control system is coaxially connected to the input end of the coaxial feed water pump, and the deaerator outlet is divided into two routes: one route is connected to the coaxial feed water pump pre-pump and the coaxial feed water pump in sequence through the coaxial feed water pump inlet electric door, and the coaxial feed water pump outlet is divided into two routes, one route passes through the coaxial feed water pump recirculation regulating valve front electric door, the coaxial feed water pump recirculation regulating valve and the coaxial feed water pump recirculation regulating valve rear electric door and then returns to the deaerator, and the other route passes through the coaxial feed water pump outlet door and merges with the electric feed water pump outlet feed water before going to the heater; the other route of the deaerator outlet is connected to the electric feed water pump pre-pump and the electric feed water pump through the electric feed water pump inlet electric door in sequence, and the electric feed water pump outlet is divided into two routes, one route passes through the electric feed water pump recirculation regulating valve front electric door, the electric feed water pump recirculation regulating valve and the electric feed water pump recirculation regulating valve rear electric door and then returns to the deaerator, and the other route passes through the electric feed water pump outlet door and merges with the coaxial feed water pump outlet through the feed water main pipe and then goes to the heater.

[0051] In one embodiment, Figure 2 As shown, the speed control system may further include: an input end gear set 3 , a planetary gear set 7 , a lubricating oil pump 4 , a working oil pump 10 , an input shaft, an output shaft, and a diaphragm coupling 21 .

[0052] The steam turbine can be coaxially connected to the input-end gear set 3 through the input shaft. The shaft power of the steam turbine is divided into two shafts after being transmitted through the input-end gear set 3. One shaft is connected to the working oil pump 10, the torque converter 11, the hydraulic brake 12, and the planetary gear set 7 in sequence; the other shaft is connected to the lubricating oil pump 4, the hydraulic coupling 6, the diaphragm coupling 21, the planetary gear set 7, the disc brake 8 and the output shaft in sequence.

[0053] Figure 3 FIG. 1 is a structural diagram of a water supply pump system according to an embodiment of the present invention. Figure 3 As shown, the water feed pump system may also include: an electric door 22 at the inlet of the electric water feed pump, an electric water feed pump front pump 23, an electric water feed pump 24, an electric water feed pump outlet door 25, an electric door 26 after the electric water feed pump recirculation regulating valve, an electric water feed pump recirculation regulating door 27, an electric door 28 before the electric water feed pump recirculation regulating valve, a coaxial water feed pump inlet electric door 29, a coaxial water feed pump front pump 30, a coaxial water feed pump 31, a coaxial water feed pump outlet door 32, an electric door 33 after the coaxial water feed pump recirculation regulating valve, a coaxial water feed pump recirculation regulating door 34, an electric door 35 before the coaxial water feed pump recirculation regulating valve, a deaerator 36 and a water feed main pipe.

[0054] The following combination Figure 2 、 Figure 3From the perspective of the present invention, the output shaft of the speed control system is coaxially connected to the input end of the coaxial feed water pump 31, and the outlet of the deaerator 36 is divided into two paths: one path is connected to the coaxial feed water pump pre-pump 30 and the coaxial feed water pump 31 in sequence through the coaxial feed water pump inlet electric door 29, and the outlet of the coaxial feed water pump 31 is divided into two paths, one path passes through the coaxial feed water pump recirculation regulating valve front electric door 35, the coaxial feed water pump recirculation regulating valve 34 and the coaxial feed water pump recirculation regulating valve rear electric door 33 and then returns to the deaerator 36, and the other path passes through the coaxial feed water pump outlet door 32 and the electric feed water pump 24 The outlet water supply is merged and then goes to the heater; the other outlet of the deaerator 36 is connected to the electric water supply pump pre-pump 23 and the electric water supply pump 24 in sequence through the electric water supply pump inlet electric door 22, and the outlet of the electric water supply pump 24 is divided into two routes, one route passes through the electric water supply pump recirculation regulating valve front electric door 28, the electric water supply pump recirculation regulating valve 27 and the electric water supply pump recirculation regulating valve rear electric door 26 and then returns to the deaerator 36, and the other route passes through the electric water supply pump outlet door 25 and merges with the outlet of the coaxial water supply pump 31 through the water supply main pipe and then goes to the heater.

[0055] In one embodiment, the speed control system may also include a first solenoid valve connected to the disc brake, a second solenoid valve connected to the hydraulic coupling, a third solenoid valve, a fourth solenoid valve connected to the diaphragm coupling, a fifth solenoid valve connected to the torque converter, and a sixth solenoid valve connected to the hydraulic brake.

[0056] like Figure 2 As shown, in one embodiment, the speed control system may also include a first solenoid valve 13 connected to the disc brake 8, a second solenoid valve 15 and a third solenoid valve 16 connected to the hydraulic coupling 6, a fourth solenoid valve 17 connected to the diaphragm coupling 21, a fifth solenoid valve 18 connected to the torque converter 11 and a sixth solenoid valve 20 connected to the hydraulic brake 12.

[0057] It should be noted that since the thermal power plant unit also includes other equipment in addition to the turbine coaxial drive feed water pump system, the parameters in S101 can also include the load of the thermal power plant unit, and then the speed of the coaxial feed water pump is controlled according to the load of the thermal power plant unit.

[0058] In one embodiment, the measurement data of the measurement points may specifically include: pressure data of the pressure measurement point, speed data of the speed measurement point, and opening data of the valve measurement point.

[0059] In this embodiment, the pressure measuring points may include: one or any combination of the coaxial water supply pump outlet water supply, the electric water supply pump outlet water supply, and the water supply main pipe water supply; the speed measuring points may include: one or any combination of the coaxial water supply pump and the electric water supply pump; the valve measuring points may include: the electric water supply pump inlet electric door, the electric water supply pump outlet electric door, the electric water supply pump recirculation regulating valve, the front and rear electric doors of the electric water supply pump recirculation regulating valve, the coaxial water supply pump recirculation regulating valve, the scoop tube of the hydraulic coupling, the guide vane of the torque converter, the first solenoid valve, the third solenoid valve, the fourth solenoid valve, and the sixth solenoid valve, or any combination.

[0060] Specifically, if Figure 2 As shown, controller 1 may include a first electro-hydraulic position controller 5 and a second electro-hydraulic position controller 19. Controller 1 collects measurement data from measurement points in the turbine coaxially driven feedwater pump system via signal cables. These data may include: input shaft speed R1, speed control system superimposed speed R2, coaxial feedwater pump speed R3, scoop opening of hydraulic coupling 6, guide vane opening or position of torque converter 11, control oil pressure P1 of diaphragm coupling 21, lubricating oil pressure P2 in the speed control system, control oil pressure P3 of torque converter 11, the on / off status of disc brake 8, and the on / off status of hydraulic brake 12. Controller 1 may also control valves or devices such as the first electro-hydraulic position controller 5, first solenoid valve 13, second solenoid valve 15, third solenoid valve 16, fourth solenoid valve 17, fifth solenoid valve 18, second electro-hydraulic position controller 19, and sixth solenoid valve 20 via signal cables. The sampling scan period of controller 1 is typically 200ms.

[0061] like Figure 3 As shown, the controller 1 can collect measurement data of the deaerator liquid level H1, the coaxial water supply pump outlet water pressure P4, the electric water supply pump outlet pressure P5, the water supply main pipe pressure P6, the electric water supply pump speed R4 and other measurement points through the signal cable. The controller 1 can also control the start and stop of the coaxial water supply pump 31 and the electric water supply pump 24, and the switching of related electric valves and pneumatic control valves through the signal cable; the sampling scan period of the controller 1 is generally 200ms.

[0062] It should be noted that, in one embodiment, the pressure measurement points in the coaxial feedwater pump startup control method may include: coaxial feedwater pump outlet water supply, electric feedwater pump outlet water supply, feedwater main pipe water supply, diaphragm coupling control oil, lubricating oil in the speed control system, and torque converter working oil, or any combination thereof; the speed measurement points may include: coaxial feedwater pump, electric feedwater pump, input shaft, planetary gear set, output shaft, speed control system, and steam turbine, or any combination thereof; the valve measurement points may include: electric feedwater pump recirculation front and rear electric doors, coaxial feedwater pump recirculation regulating valve, coaxial feedwater pump recirculation regulating valve front and rear electric doors, electric feedwater pump recirculation regulating valve, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve, sixth solenoid valve, front pump inlet electric gate valve, scoop pipe of hydraulic coupling, guide vane of torque converter, and feedwater pump recirculation pipeline regulating valve, or any combination thereof.

[0063] In one embodiment, before the steam turbine is started, the steps further include: obtaining steam turbine parameters; controlling devices in the steam turbine coaxially driven feedwater pump system, excluding the speed control system, to send a start signal to the steam turbine; and controlling the steam turbine to start when the steam turbine parameters meet preset start conditions and the steam turbine receives start signals from all devices in the steam turbine coaxially driven feedwater pump system. It should be noted that steam turbine startup requires not only the start signal from the speed control system in S102 but also the start signals from other related devices in the steam turbine coaxially driven feedwater pump system and the steam turbine itself meeting preset start conditions.

[0064] Figure 4 FIG. 1 is a flow chart of a specific example of a coaxial water supply pump startup control method according to an embodiment of the present invention. Figure 4 As shown, the coaxial water supply pump startup control method may specifically include:

[0065] S401. Start the electric feed water pump to supply water to the boiler, prepare for starting the turbine coaxial drive feed water pump system, and reset the speed control system.

[0066] In one embodiment, before controlling the start-up of the steam turbine, it can also include: controlling the front and rear electric doors of the electric feed water pump recirculation regulating valve to open, and controlling the electric feed water pump recirculation regulating valve to be in the automatic position; the electric feed water pump recirculation regulating valve is placed in the automatic position, which means: adjusting its own opening according to the inlet feed water flow of the electric feed water pump; controlling the coaxial feed water pump recirculation regulating valve and the front and rear electric doors of the coaxial feed water pump recirculation regulating valve to be fully opened; and resetting the solenoid valve of the speed control system.

[0067] The boiler is initially supplied with water by an electric feedwater pump. Therefore, before the turbine is started, the electric feedwater pump is first used to supply water to the boiler. The electric doors before and after the electric feedwater pump recirculation are opened, and the electric feedwater pump recirculation regulating valve is placed in the automatic position. The opening is automatically adjusted according to the feedwater flow rate at the inlet of the electric feedwater pump. The coaxial feedwater pump recirculation regulating valve and its front and rear electric doors are fully opened. Check that the coaxial feedwater pump has been filled with water and its inlet electric door is fully opened. Reset the solenoid valves of the speed control system. The status of each solenoid valve after reset is shown in Table 1 below:

[0068] Table 1

[0069] Solenoid valve status Corresponding functional status The second solenoid valve 46.6 is energized Fluid coupling bypass valve open The third solenoid valve 46.1 loses power Drain the hydraulic coupling control oil The fifth solenoid valve 46.4 is energized Filling torque converter control oil The sixth solenoid valve 46.5 loses power Draining the hydraulic brake control oil The fourth solenoid valve 46.2 loses power Disengagement of diaphragm coupling The first solenoid valve 90.2 is energized Disc brake in braking state

[0070] S402: Determine whether the turbine startup conditions are met.

[0071] In one embodiment, the turbine startup conditions further include the following conditions: the pressure of the diaphragm coupling control oil is less than a third preset pressure, and the interlocking brake unit is in a released state.

[0072] In this step, when the speed control system is ready, a start signal is sent to the turbine through the controller. The speed control system side conditions for turbine start release include: (1) the speed control system is not in test mode; (2) the speed control system lubricating oil pressure P2>k; (3) the speed control system has no alarm or trip signal; (4) the diaphragm coupling control oil pressure P1<m; (5) the speed control system maintenance interlock brake unit has been released. If the turbine start release conditions are not met, return to S901 and start again.

[0073] Among them, the values ​​of the fixed first preset pressure k and the second preset pressure m are determined according to the actual operation conditions of the steam turbine coaxially driven feed water pump system. For example, in a certain embodiment, k is 0.34 MPa and m is 0.05 MPa.

[0074] It should be pointed out that the conditions required for starting the steam turbine involve various equipment such as the steam turbine body, speed control system, electric feed water pump, etc. Since the present invention only studies the automatic control method of the coaxial feed water pump, this step only focuses on the speed control system for the conditions for starting and releasing the steam turbine, and does not involve the conditions of other equipment systems. In fact, before the steam turbine is started, all supporting equipment systems must meet the conditions.

[0075] S403, the turbine is started up and the speed is increased. When R1>a, the fifth solenoid valve 46.4 is closed.

[0076] When the steam turbine receives the start signal from the speed control system, the turbine coaxial drive water pump system starts to execute the turbine start-up impulse procedure. During the speed increase process, when the input shaft speed R1 of the speed control system is greater than a, the controller automatically closes the fifth solenoid valve 46.4 and loses power, thereby completely draining the oil from the torque converter. After the oil is drained, the driven side of the speed control system is completely braked.

[0077] The value of the constant a is determined according to the actual operation of the steam turbine coaxially driven feedwater pump system. For example, in a certain embodiment, a is 2200 r / min.

[0078] S404: Determine whether the speed control system superposition speed R2 < n is satisfied?

[0079] When the fifth solenoid valve 46.4 is closed and loses power, the torque converter will completely drain the oil. After draining the oil, the driven side of the speed control system will be completely braked. If the superimposed speed of the speed control system R2 is less than n, it is determined that the driven shaft of the speed control system has been braked, and the turbine can continue to increase the speed, that is, execute S905.

[0080] The value of the constant n is determined according to the actual operation of the steam turbine coaxially driven feedwater pump system. For example, in a certain embodiment, n is 5 r / min.

[0081] S405, the turbine continues to increase speed to 3000r / min.

[0082] The steam turbine continues to execute the impulse start procedure and eventually increases its speed to 3000r / min. At this point, the coaxial feedwater pump drive side equipment has been started and the conditions for starting the pump are met. At the end of the steam turbine start-up, the status of each solenoid valve in the speed control system is shown in Table 2 below:

[0083] Table 2

[0084] Solenoid valve status Corresponding functional status The second solenoid valve 46.6 is energized Fluid coupling bypass valve open The third solenoid valve 46.1 loses power Drain the hydraulic coupling control oil The fifth solenoid valve 46.4 loses power Drain the torque converter control oil The sixth solenoid valve 46.5 loses power Draining the hydraulic brake control oil The fourth solenoid valve 46.2 loses power Disengagement of diaphragm coupling The first solenoid valve 90.2 is energized Disc brake in braking state

[0085] S406. Determine whether the coaxial water supply pump meets the starting conditions?

[0086] In one embodiment, the starting conditions of the coaxial water pump also include the following multiple conditions: the input shaft speed is greater than the first preset speed, the pressure of the diaphragm coupling control oil is less than the fourth preset pressure, the interlocking brake unit is in the released state, and the pressure of the torque converter working oil is less than the fifth preset pressure.

[0087] After the turbine is started, before starting the coaxial feedwater pump, it is necessary to determine whether the following conditions are met, including: (1) the speed control system is not in test mode; (2) the speed control system lubricating oil pressure P2 is greater than the third preset pressure k; (3) the speed control system does not have any alarm or trip signals; (4) the speed control system input shaft speed R1 is greater than the first preset speed q; (5) the diaphragm coupling control oil pressure P1 is less than the fourth preset pressure m; (6) the interlocking brake unit for speed control system maintenance has been released; (7) the torque converter working oil pressure P3 is less than the fifth preset pressure r. If the above conditions are met, execute S907; otherwise, jump back to S903.

[0088] Among them, the values ​​of the constants k, m, q, and r are determined according to the actual operating conditions of the steam turbine coaxially driven feed water pump system. For example, in a certain embodiment, k is 0.34 MPa, m is 0.05 MPa, q is 2700 r / min, and r is 0.05 MPa.

[0089] S407, open the third solenoid valve 46.1, open the sixth solenoid valve 46.5, close the first solenoid valve 90.2, and the coaxial water supply pump starts to start and increase speed.

[0090] The controller energizes and opens the third solenoid valve 46.1, energizes and opens the sixth solenoid valve 46.5, and de-energizes and closes the first solenoid valve 90.2, thereby filling the hydraulic coupling with control oil and filling the hydraulic brake with control oil. At the same time, the disc brake is disengaged, and the coaxial water pump starts to start and increase speed. Its speed is precisely controlled by the first electro-hydraulic position controller. At this time, the speed control system operates in the first working mode (hydraulic coupling working mode). The status of each solenoid valve in the speed control system is shown in Table 1.

[0091] During the startup process of the coaxial water supply pump, the speed control system switches between the first working mode and the second working mode. The first working mode and the second working mode are introduced below.

[0092] During the startup and speed-up phase of the coaxial water pump, its speed is precisely controlled by the first electro-hydraulic position controller. At this time, the speed control system operates in the first working mode, that is, the hydraulic coupling working mode. The status of each solenoid valve in the speed control system is shown in Table 3 below:

[0093] Table 3

[0094] Solenoid valve status Corresponding functional status The second solenoid valve 46.6 is energized Fluid coupling bypass valve open The third solenoid valve 46.1 is energized Fill the hydraulic coupling with control oil The fifth solenoid valve 46.4 loses power Drain the torque converter control oil The sixth solenoid valve 46.5 is energized Filling hydraulic brake control oil The fourth solenoid valve 46.2 loses power Disengagement of diaphragm coupling The first solenoid valve 90.2 loses power Disc brake is disengaged

[0095] When the coaxial feedwater pump's speed is low, power is transmitted directly from the planetary gear set via the hydraulic coupling. Adjusting the hydraulic coupling's scoop opening alone adjusts the oil level, and thus the pump's speed. During this period, the solenoid valves maintain their states as they did when the speed control system was started.

[0096] Figure 5 FIG. 1 is a schematic diagram of a first working mode of a speed control system according to an embodiment of the present invention. Figure 5 As shown, under this operating condition, power is transmitted solely to the output shaft via the hydraulic coupling. The controller adjusts the opening of the hydraulic coupling's scoop tube to control the coaxial feedwater pump's speed. This operating mode allows for a speed adjustment range of approximately 0-80%. The torque converter is drained and inoperative. The hydraulic brake is filled with oil, generating a reverse torque on the planetary gears. This maintains a low speed, preventing rust and friction marks.

[0097] When the coaxial feedwater pump cannot meet the boiler's water supply demand, the speed control system switches from the first operating mode to the second operating mode, namely the torque converter mode. At this time, the controller de-energizes and closes the third solenoid valve 46.1, energizes and opens the fifth solenoid valve 46.4, de-energizes and closes the sixth solenoid valve 46.5, and energizes and opens the fourth solenoid valve 46.2, thereby draining the hydraulic coupling working oil, injecting the diaphragm coupling, filling the torque converter working oil, and draining the hydraulic brake working oil. At this time, the status of each solenoid valve in the speed control system is shown in Table 4 below:

[0098] Table 4

[0099] Solenoid valve status Corresponding functional status The second solenoid valve 46.6 is energized Fluid coupling bypass valve open The third solenoid valve 46.1 loses power Drain the hydraulic coupling control oil The fifth solenoid valve 46.4 is energized Filling torque converter control oil The sixth solenoid valve 46.5 loses power Draining the hydraulic brake control oil The fourth solenoid valve 46.2 is energized Diaphragm coupling investment The first solenoid valve 90.2 loses power Disc brake is disengaged

[0100] Figure 6 FIG. 1 is a schematic diagram of a second working mode of a speed control system according to an embodiment of the present invention. Figure 6 As shown, in this state, the front and rear rotors of the hydraulic coupling are mechanically coupled via a diaphragm coupling, and the hydraulic coupling no longer performs a regulating function. Simultaneously, the hydraulic brake is vented, disengaging the brake position. The coaxial feedwater pump speed is now regulated by the torque converter's second electro-hydraulic position controller. By varying the position of the torque converter's guide vanes, the torque output to the driven shaft is adjusted and superimposed via gears on the planetary gear system's output shaft, i.e., the feedwater pump's output shaft.

[0101] It should be pointed out that as the load of the turbine coaxially driven feed water pump system rises and falls, the boiler feed water changes continuously. The control method proposed in the present invention can ensure that the speed control system can switch quickly and freely between these two working modes. The entire switching process is fast and stable, without dwell time, which can ensure stable and continuous changes in the boiler water supply.

[0102] Returning to S407, when the coaxial feedwater pump's speed is low, power is transmitted directly through the planetary gears via the hydraulic coupling. Adjusting the hydraulic coupling's scoop opening alone adjusts the oil level, and thus the coaxial feedwater pump's speed. During this period, the solenoid valves remain in the same state as when the speed control system was started.

[0103] like Figure 5 As shown, under this operating condition, power is transmitted solely to the output shaft via the hydraulic coupling. The controller adjusts the opening of the hydraulic coupling's scoop tube to control the coaxial feedwater pump's speed. This operating mode allows for a speed adjustment range of approximately 0-80%. The torque converter is drained and inoperative. The hydraulic brake is filled with oil, generating a reverse torque on the planetary gears. This maintains a low speed, preventing rust and friction marks.

[0104] S408. When the pump paralleling conditions are met, start the "coaxial water supply pump paralleling program".

[0105] After the coaxial feed water pump is started, if the turbine coaxial drive feed water pump system needs to continue to increase the load, the coaxial feed water pump needs to be merged into the turbine coaxial drive feed water pump system, and the electric feed water pump needs to be withdrawn from the turbine coaxial drive feed water pump system. At this time, the controller calls the "coaxial feed water pump parallel program", and after the coaxial feed water pump is merged, the electric feed water pump is withdrawn from the operation.

[0106] S409. The speed of the coaxial feedwater pump changes according to the load of the steam turbine coaxial drive feedwater pump system, and receives the speed instruction from the DCS (Distributed Control System) to the controller.

[0107] In one embodiment, controlling the speed of the coaxial feed water pump according to the load of the steam turbine coaxial drive feed water pump system until the coaxial feed water pump reaches the rated operating condition may include: adjusting the speed of the coaxial feed water pump through a hydraulic coupling according to the load of the steam turbine coaxial drive feed water pump system.

[0108] After the coaxial feedwater pump is incorporated into the steam turbine coaxial drive feedwater pump system, as the load of the steam turbine coaxial drive feedwater pump system changes and the boiler water supply volume is different, the controller begins to receive the speed command from the steam turbine coaxial drive feedwater pump system DCS, and then adjusts the speed of the coaxial feedwater pump through the first electro-hydraulic position controller of the hydraulic coupling.

[0109] S410. Determine whether the hydraulic coupling scoop tube opening is greater than b?

[0110] In one embodiment, the speed of the coaxial feed water pump is controlled according to the load of the steam turbine coaxial drive feed water pump system until the coaxial feed water pump reaches the rated operating condition. It may also include: when the scoop tube opening of the hydraulic coupling is greater than the first preset opening, the third solenoid valve is controlled to close, the fifth solenoid valve is controlled to open, the sixth solenoid valve is controlled to close, and the fourth solenoid valve is controlled to open in sequence.

[0111] When the turbine coaxially driven feedwater pump system increases its load to a certain level, if the hydraulic coupling scoop tube opening is greater than the first preset opening b, it indicates that the speed control system has approached the upper speed limit of the first working mode. If the speed needs to be further increased, it is necessary to switch to the second working mode, that is, the torque converter needs to intervene in the regulation and execute S911.

[0112] The value of the constant b is determined according to the actual situation of the steam turbine coaxially driven feedwater pump system and equipment. For example, in a certain embodiment, b is 90%.

[0113] S411, close the third solenoid valve 46.1, open the fifth solenoid valve 46.4, close the sixth solenoid valve 46.5, open the fourth solenoid valve 46.2, and the coaxial water pump continues to increase its speed.

[0114] When the speed control system's first operating mode fails to meet the boiler's water supply needs, it switches to the second operating mode (torque converter mode). At this point, the controller de-energizes and closes third solenoid valve 46.1, energizes and opens fifth solenoid valve 46.4, de-energizes and closes sixth solenoid valve 46.5, and energizes and opens fourth solenoid valve 46.2. This drains the hydraulic coupling's operating oil, injects the diaphragm coupling, fills the torque converter's operating oil, and drains the hydraulic brake's operating oil. The status of each solenoid valve in the speed control system is shown in Table 2.

[0115] In one embodiment, the speed of the coaxial feed water pump is controlled according to the load of the steam turbine coaxial drive feed water pump system until the coaxial feed water pump reaches the rated operating condition. It may also include: after the working oil of the hydraulic coupling is drained, the front and rear rotors of the hydraulic coupling are controlled to be mechanically coupled through a diaphragm coupling, and the hydraulic brake is controlled to disengage the braking position; the speed of the coaxial feed water pump is adjusted through the torque converter until the coaxial feed water pump reaches the rated operating condition.

[0116] like Figure 4 As shown, in this state, the front and rear rotors of the hydraulic coupling are mechanically coupled via a diaphragm coupling, and the hydraulic coupling no longer performs a regulating function. Simultaneously, the hydraulic brake is vented, disengaging the brake position. The coaxial feedwater pump's speed is now regulated by the torque converter's second electro-hydraulic position controller. By varying the position of the torque converter's guide vanes, the torque output to the driven shaft is adjusted and superimposed via gears on the output shaft of the planetary gear set, i.e., the coaxial feedwater pump's output shaft.

[0117] S412. The coaxial feedwater pump continues to increase in speed as the load of the steam turbine coaxially driven feedwater pump system increases until it reaches the rated operating condition.

[0118] When the coaxial feedwater pump switches to the second working mode, the controller begins to continue to receive the speed command from the DCS of the turbine coaxial drive feedwater pump system, and then adjusts the speed of the coaxial feedwater pump through the second electro-hydraulic position controller of the torque converter. As the load of the turbine coaxial drive feedwater pump system increases, the coaxial feedwater pump can increase its speed to the rated operating condition.

[0119] It should be pointed out that as the load of the turbine coaxially driven feed water pump system rises and falls, the boiler feed water changes continuously. The control method proposed in the present invention can ensure that the coaxial feed water pump can switch quickly and freely between these two working modes. The entire switching process is fast and stable, without dwell time, which can ensure stable and continuous changes in the boiler water supply.

[0120] In order to achieve precise automatic control of the coaxial feedwater pump startup and pumping process, ensure that the coaxial feedwater pump can be quickly and stably integrated into the turbine coaxial drive feedwater pump system during startup, and replace the electric feedwater pump for boiler water supply, in one embodiment, the coaxial feedwater pump pumping procedure may include:

[0121] Control the recirculation regulating valve of the coaxial water feed pump and the recirculation regulating valve of the electric water feed pump to the automatic position; the recirculation regulating valve of the coaxial water feed pump is placed in the automatic position, which means that the opening degree thereof is adjusted according to the inlet water flow of the coaxial water feed pump;

[0122] Controlling the coaxial water supply pump to increase speed at a rate lower than the first preset rate until the difference between the water supply pressure at the outlet of the coaxial water supply pump and the water supply pressure at the outlet of the electric water supply pump is less than the first preset difference and the difference between the water supply pressure at the outlet of the coaxial water supply pump and the water supply main pipe pressure is less than the second preset difference;

[0123] Controlling the electric door of the coaxial water pump outlet to open to full open at a second preset rate;

[0124] Control the coaxial water supply pump to increase the speed to a second preset speed and the electric water supply pump to decrease the speed to a third preset speed;

[0125] If the difference between the outlet water pressure of the coaxial water supply pump and the outlet water pressure of the electric water supply pump is greater than the third preset difference, and the difference between the main water supply pipe pressure and the outlet water pressure of the electric water supply pump is greater than the fourth preset difference, the electric door at the outlet of the electric water supply pump is controlled to close at the third preset rate;

[0126] When the electric door at the outlet of the electric water supply pump is fully closed, the electric water supply pump is controlled to stop running.

[0127] Figure 7 This is a flowchart of a specific example of a coaxial water pump parallel pumping procedure in an embodiment of the present invention, with reference to Figure 7 As shown, in some embodiments, the coaxial water pump parallel pump control program may include the following steps:

[0128] S701. Place the recirculation regulating valve of the coaxial water supply pump and the recirculation regulating valve of the electric water supply pump in the automatic position, and control the coaxial water supply pump to slowly increase the speed at a rate lower than the first preset rate.

[0129] First, the recirculation regulating valves of the coaxial water supply pump and the electric water supply pump are placed in the automatic position. The opening can be automatically adjusted according to the water supply flow rate at the corresponding water supply pump inlet to prevent the coaxial water supply pump from overloading or the electric water supply pump from being blocked during the parallel pumping process; the controller controls the coaxial water supply pump to slowly increase the speed at a rate lower than the first preset rate through the first electro-hydraulic position controller.

[0130] S702: Determine whether the conditions |P4-P5| < first preset difference c, |P4-P6| < second preset difference d are met.

[0131] The coaxial water feed pump slowly increases its speed until the outlet water pressure P4 of the coaxial water feed pump is balanced with the outlet water pressure P5 of the electric water feed pump and the main water feed pipe pressure P6 (the judgment condition is ︱P4-P5︱<first preset difference c, ︱P4-P6︱<second preset difference d) to prevent excessive impact on the water feed pipe or large disturbance to the water supply to the boiler when the outlet door of the coaxial water feed pump is opened.

[0132] The values ​​of the constants c and d are determined according to the actual conditions of the steam turbine coaxially driven feedwater pump system and equipment. For example, in a certain embodiment, c is 0.1 MPa and d is 0.1 MPa.

[0133] S703. Slowly open the electric door at the outlet of the coaxial water pump at a second preset rate, where the second preset rate is e.

[0134] After the conditions of S702 are met, the coaxial feedwater pump outlet electric door can be slowly opened at a second preset rate e to put the coaxial feedwater pump into the turbine coaxial drive feedwater pump system.

[0135] The value of the constant e is determined according to the actual situation of the steam turbine coaxially driven feedwater pump system and equipment. For example, in a certain embodiment, e is 2% / s.

[0136] S704. Determine whether the electric door at the outlet of the coaxial water pump is fully open?

[0137] Only when the electric gate of the coaxial water supply pump outlet is fully opened, that is, the coaxial water supply pump is fully put into the water supply system, can the speed of the coaxial water supply pump be further increased. Otherwise, it is easy to cause the coaxial water supply pump to stagnate and cause erosion of the outlet gate valve core.

[0138] S705 . On the original basis, the coaxial water supply pump speed R3 is increased by a second preset speed f, and the electric water supply pump speed R4 is reduced by a third preset speed g.

[0139] After the coaxial feed water pump is fully put into the turbine coaxial drive feed water pump system, the coaxial feed water pump speed R3 can be quickly increased to the second preset speed f, and at the same time the electric feed water pump speed R4 can be reduced to the third preset speed g, so as to ensure that the outlet water of the coaxial feed water pump can be quickly pushed into the water supply main pipe, and the electric feed water pump can quickly exit after reducing the speed; in this process, the electric feed water pump recirculation regulating valve will gradually open until it is fully open, and the coaxial feed water pump recirculation regulating valve will gradually close until it is fully closed.

[0140] The values ​​of the fixed values ​​f and g are determined according to the actual conditions of the steam turbine coaxially driven feedwater pump system and equipment. For example, in a certain embodiment, f is 200 r / min and g is 200 r / min.

[0141] S706: Determine whether the following conditions are met: P6-P5>fourth preset difference h, P4-P5>third preset difference i?

[0142] The electric door at the outlet of the electric feed water pump can only be closed when it is determined that the electric feed water pump is completely no longer responsible for the boiler water supply task. The judgment condition is that the outlet water supply pressure of the coaxial feed water pump and the main water supply pipe pressure are both much greater than the outlet water supply pressure of the electric feed water pump, that is, P6-P5>the fourth preset difference h, P4-P5>the third preset difference i.

[0143] The values ​​of the constants h and i are determined according to the actual conditions of the steam turbine coaxially driven feedwater pump system and equipment. For example, in a certain embodiment, h is 2 MPa and i is 2 MPa.

[0144] S707. Slowly close the electric door at the outlet of the electric water supply pump at a third preset rate, where the third preset rate is j.

[0145] When it is determined that the electric feed water pump is completely unable to bear the task of boiler water supply, the electric door at the outlet of the electric feed water pump can be slowly closed at a third preset rate j to prevent the withdrawal of the electric feed water pump from causing disturbance to the boiler water supply.

[0146] The value of the constant j is determined according to the actual situation of the steam turbine coaxially driven feedwater pump system and equipment. For example, in a certain embodiment, j is 3% / s.

[0147] S708. When the electric door at the electric pump outlet is fully closed, stop the electric water supply pump and complete the pumping.

[0148] After the electric door at the outlet of the electric feed water pump is fully closed, the electric feed water pump will be shut down, and the boiler water supply task will be undertaken solely by the coaxial feed water pump, and the entire pump paralleling process will be completed.

[0149] Compared with the prior art, the embodiment of the present invention obtains the parameters of the steam turbine coaxial drive water pump system in real time; the parameters include the load, operating status and measurement data of the measuring points of the steam turbine coaxial drive water pump system; judges whether the parameters meet the steam turbine starting conditions, and if so, controls the speed control system to send a starting signal to the steam turbine to control the steam turbine to start; the steam turbine starting conditions include: the speed control system is in test mode, the measurement data of the measuring points set at the speed control system are respectively within a plurality of preset data ranges, and the speed control system does not receive an alarm signal or a trip signal; after the steam turbine is started, judges whether the parameters meet the coaxial feed water pump starting conditions, and if so, sends a starting signal to the coaxial feed water pump to control the coaxial feed water pump to start; the coaxial The starting conditions of the coaxial feed water pump include: the operating status of the speed control system is not in the test mode, the measurement data of the measuring points set at the speed control system are respectively within the preset multiple data ranges, and the speed control system does not receive an alarm signal or a trip signal; after the coaxial feed water pump is started, the coaxial feed water pump parallel pump program is called and executed according to the parameters; the coaxial feed water pump parallel pump program is used to control the coaxial feed water pump to replace the electric feed water pump to supply water to the boiler; according to the load of the turbine coaxial drive feed water pump system, the speed of the coaxial feed water pump is controlled until the coaxial feed water pump reaches the rated operating condition, which can provide a more accurate and reasonable coaxial feed water pump startup control logic, improve safety performance, improve the degree of automation of equipment operation, reduce manual operation, and avoid errors caused by manual operation.

[0150] An embodiment of the present invention provides a coaxial feedwater pump starting control device, which is used to provide more accurate and reasonable starting control logic for a turbine coaxial feedwater pump. While ensuring the safe operation of a turbine coaxial drive feedwater pump system that applies turbine coaxial drive feedwater pump technology, it improves the degree of automation of equipment operation, reduces manual workload, and avoids errors that may be caused by manual judgment of equipment failures.

[0151] A coaxial feedwater pump starting control device is applied to a controller; the controller is connected to a steam turbine coaxially driven feedwater pump system; the steam turbine coaxially driven feedwater pump system includes: a steam turbine, a speed control system, a feedwater pump system, and a boiler; the speed control system is respectively connected to the steam turbine and the feedwater pump system for adjusting the speed of the feedwater pump system; the steam turbine is used to drive the feedwater pump system; the feedwater pump system includes a coaxial feedwater pump and an electric feedwater pump connected to the coaxial feedwater pump; the coaxial feedwater pump and the electric feedwater pump are used to supply water to the boiler; the boiler is initially supplied with water by the electric feedwater pump.

[0152] Figure 8 FIG. 1 is a structural block diagram of a coaxial water pump start-up control device according to an embodiment of the present invention. Figure 8 As shown, the present invention provides a coaxial water pump start-up control device that may include:

[0153] Acquisition module 801, for acquiring real-time measurement data of the load, operating status, and measurement points of the steam turbine coaxial drive feedwater pump system;

[0154] The steam turbine startup module 802 is configured to determine whether the operating status of the steam turbine coaxially driven feedwater pump system and the measurement data of the measurement points meet the steam turbine startup conditions. If so, it controls the speed control system to send a startup signal to the steam turbine. The steam turbine startup conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than a first preset pressure, and the speed control system has not received an alarm signal or a trip signal.

[0155] The coaxial feedwater pump starting module 803 is used to determine whether the operating status of the coaxial drive feedwater pump system of the steam turbine and the measurement data of the measuring points meet the coaxial feedwater pump starting conditions after the steam turbine is started. If so, a starting signal is sent to the coaxial feedwater pump to control the coaxial feedwater pump to start. The coaxial feedwater pump starting conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than the second preset pressure, and the speed control system has not received an alarm signal or a trip signal;

[0156] The pump paralleling module 804 is used to call and execute the coaxial feedwater pump paralleling program after the coaxial feedwater pump is started up, based on the load, operating status, and measurement data of the turbine coaxial drive feedwater pump system. The coaxial feedwater pump paralleling program is used to control the coaxial feedwater pump to replace the electric feedwater pump to supply water to the boiler.

[0157] The control module 805 is used to control the speed of the coaxial feedwater pump according to the load of the steam turbine coaxial drive feedwater pump system until the coaxial feedwater pump reaches the rated operating condition.

[0158] In one embodiment, the speed control system includes: an input end gear set, a torque converter, a disc brake, a hydraulic brake, a planetary gear set, a lubricating oil pump, a working oil pump, a hydraulic coupling, an input shaft, an output shaft, a diaphragm coupling, and an interlocking brake unit;

[0159] The feed water pump system also includes a coaxial feed water pump pre-pump, an electric feed water pump pre-pump, a deaerator, a coaxial feed water pump inlet electric door, a coaxial feed water pump outlet electric door, a coaxial feed water pump recirculation regulating valve, front and rear electric doors of the coaxial feed water pump recirculation regulating valve, an electric feed water pump inlet electric door, an electric feed water pump outlet electric door, an electric feed water pump recirculation regulating valve, front and rear electric doors of the electric feed water pump recirculation regulating valve, and a water supply main pipe;

[0160] The steam turbine is coaxially connected to the input-end gear set via an input shaft. The turbine's shaft power is transmitted through the input-end gear set and then divided into two shafts. One shaft is sequentially connected to the working oil pump, the torque converter, the hydraulic brake, and the planetary gear set; the other shaft is sequentially connected to the lubricating oil pump, the hydraulic coupling, the diaphragm coupling, the planetary gear set, the disc brake, and the output shaft. The interlocking brake unit is respectively connected to each device in the speed control system and is used to perform maintenance on each device in the speed control system.

[0161] The output shaft of the speed control system is coaxially connected to the input end of the coaxial feed water pump, and the deaerator outlet is divided into two routes: one route is connected to the coaxial feed water pump pre-pump and the coaxial feed water pump in sequence through the coaxial feed water pump inlet electric door, and the coaxial feed water pump outlet is divided into two routes, one route passes through the coaxial feed water pump recirculation regulating valve front electric door, the coaxial feed water pump recirculation regulating valve and the coaxial feed water pump recirculation regulating valve rear electric door and then returns to the deaerator, and the other route passes through the coaxial feed water pump outlet door and merges with the electric feed water pump outlet feed water before going to the heater; the other route of the deaerator outlet is connected to the electric feed water pump pre-pump and the electric feed water pump through the electric feed water pump inlet electric door in sequence, and the electric feed water pump outlet is divided into two routes, one route passes through the electric feed water pump recirculation regulating valve front electric door, the electric feed water pump recirculation regulating valve and the electric feed water pump recirculation regulating valve rear electric door and then returns to the deaerator, and the other route passes through the electric feed water pump outlet door and merges with the coaxial feed water pump outlet through the feed water main pipe and then goes to the heater.

[0162] In one embodiment, the speed control system also includes a first solenoid valve connected to the disc brake, a second solenoid valve connected to the hydraulic coupling, a third solenoid valve, a fourth solenoid valve connected to the diaphragm coupling, a fifth solenoid valve connected to the torque converter, and a sixth solenoid valve connected to the hydraulic brake.

[0163] In one embodiment, the measurement data of the measuring points specifically include: pressure data of the pressure measuring point, speed data of the speed measuring point, and opening data of the valve measuring point.

[0164] In one embodiment, the pressure measurement points include: water supply from the outlet of the coaxial water pump, water supply from the outlet of the electric water pump, water supply from the main water pipe, control oil from the diaphragm coupling, lubricating oil in the speed control system, and working oil of the torque converter, or any combination thereof;

[0165] Speed ​​measurement points include: coaxial feed water pump, electric feed water pump, input shaft, planetary gear set, output shaft, speed control system, steam turbine, or any combination thereof;

[0166] The valve measurement points include: electric doors before and after the electric water feed pump recirculation, coaxial water feed pump recirculation regulating valve, electric doors before and after the coaxial water feed pump recirculation regulating valve, electric water feed pump recirculation regulating valve, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve, sixth solenoid valve, electric gate valve for the front pump inlet, scoop tube for the hydraulic coupling, guide vane for the torque converter, one or any combination of the water feed pump recirculation pipeline regulating valve.

[0167] In one embodiment, the coaxial water supply pump startup control device may further include: a pre-control module, configured to:

[0168] Control the front and rear electric doors of the electric water supply pump recirculation regulating valve to open, and control the electric water supply pump recirculation regulating valve to be in the automatic position; the electric water supply pump recirculation regulating valve being in the automatic position means: adjusting its own opening according to the inlet water flow of the electric water supply pump;

[0169] Control the coaxial water feed pump recirculation regulating valve and the front and rear electric doors of the coaxial water feed pump recirculation regulating valve to fully open;

[0170] Reset the solenoid valve of the speed control system.

[0171] In one embodiment, the turbine startup conditions further include the following conditions: the pressure of the diaphragm coupling control oil is less than a third preset pressure, and the interlocking brake unit is in a released state.

[0172] In one embodiment, the coaxial water pump start-up conditions also include the following conditions: the input shaft speed is greater than a first preset speed, the pressure of the diaphragm coupling control oil is less than a fourth preset pressure, the interlocking brake unit is in the released state, and the pressure of the torque converter working oil is less than a fifth preset pressure.

[0173] In one embodiment, the device also includes: a judgment module for obtaining the parameters of the steam turbine; controlling the equipment in the steam turbine coaxially driven feed water pump system except the speed control system, and sending a start signal to the steam turbine; when the parameters of the steam turbine meet the preset start conditions and the steam turbine obtains the start signal of all equipment in the steam turbine coaxially driven feed water pump system, controlling the steam turbine to start.

[0174] In one embodiment, the coaxial feedwater pump paralleling procedure includes:

[0175] Control the recirculation regulating valve of the coaxial water feed pump and the recirculation regulating valve of the electric water feed pump to the automatic position; the recirculation regulating valve of the coaxial water feed pump is placed in the automatic position, which means that the opening degree thereof is adjusted according to the inlet water flow of the coaxial water feed pump;

[0176] Controlling the coaxial water supply pump to increase speed at a rate lower than the first preset rate until the difference between the water supply pressure at the outlet of the coaxial water supply pump and the water supply pressure at the outlet of the electric water supply pump is less than the first preset difference and the difference between the water supply pressure at the outlet of the coaxial water supply pump and the water supply main pipe pressure is less than the second preset difference;

[0177] Controlling the electric door of the coaxial water pump outlet to open to full open at a second preset rate;

[0178] Control the coaxial water supply pump to increase the speed to a second preset speed and the electric water supply pump to decrease the speed to a third preset speed;

[0179] If the difference between the outlet water pressure of the coaxial water supply pump and the outlet water pressure of the electric water supply pump is greater than the third preset difference, and the difference between the main water supply pipe pressure and the outlet water pressure of the electric water supply pump is greater than the fourth preset difference, the electric door at the outlet of the electric water supply pump is controlled to close at the third preset rate;

[0180] When the electric door at the outlet of the electric water supply pump is fully closed, the electric water supply pump is controlled to stop running at the first preset rate, the first preset difference, the second preset difference, the second preset rate, the second preset speed, the third preset speed, the third preset difference, the fourth preset difference, and the third preset rate.

[0181] In one embodiment, the control module 805 is specifically configured to:

[0182] According to the load of the steam turbine coaxial drive feedwater pump system, the speed of the coaxial feedwater pump is adjusted through the hydraulic coupling;

[0183] When the opening of the scoop tube of the hydraulic coupling is greater than the first preset opening, the third solenoid valve is controlled to close, the fifth solenoid valve is controlled to open, the sixth solenoid valve is controlled to close, and the fourth solenoid valve is controlled to open in sequence;

[0184] After the working oil of the hydraulic coupling is drained, the front and rear rotors of the hydraulic coupling are mechanically coupled through the diaphragm coupling, and the hydraulic brake is controlled to disengage the braking position;

[0185] The speed of the coaxial water feed pump is adjusted by the hydraulic torque converter until the coaxial water feed pump reaches the first preset opening of the rated working condition.

[0186] It should be noted that although the above detailed description mentions several modules of the coaxial feedwater pump stop control device and the coaxial feedwater pump start control device, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more modules described above can be embodied in a single module. Conversely, the features and functions of a single module described above can be further divided and embodied by multiple modules.

[0187] Based on the above invention concept, Figure 9As shown, the present invention also proposes a computer device 900, including a memory 901, a processor 902 and a computer program 903 stored in the memory 901 and executable on the processor 902, wherein the processor 902 implements the aforementioned coaxial water supply pump startup control method when executing the computer program 903.

[0188] Based on the aforementioned inventive concept, the present invention proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the aforementioned coaxial water supply pump startup control method is implemented.

[0189] Based on the aforementioned inventive concept, the present invention proposes a computer program product, which includes a computer program. When the computer program is executed by a processor, a coaxial water supply pump startup control method is implemented.

[0190] The embodiment of the present invention automatically controls the process of the coaxial water feed pump from starting and pumping to full load output, thereby achieving close and precise coordination of various components such as the coaxial water feed pump, the speed control system hydraulic coupling, the hydraulic torque converter, the hydraulic brake, and the diaphragm coupling, thereby ensuring automatic and precise control of the entire process of switching between the first working mode and the second working mode of the speed control system. By applying the technical solution of the present invention, the cumbersome steps and possible misoperations of the operating personnel can be greatly reduced, the risk of starting the coaxial water feed pump to full load can be reduced, and the automation level of the turbine coaxial drive water feed pump system can be significantly improved, thereby ensuring the safe and stable operation of the turbine coaxial drive water feed pump.

[0191] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0192] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0193] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0194] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0195] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coaxial water pump startup control method, characterized in that: Applicable to a controller; the controller is connected to a steam turbine coaxial drive feedwater pump system; The steam turbine coaxially driven feedwater pump system includes: a steam turbine, a speed control system, a feedwater pump system, and a boiler; the speed control system is connected to the steam turbine and the feedwater pump system respectively, and is used to adjust the speed of the feedwater pump system; the steam turbine is used to drive the feedwater pump system; the feedwater pump system includes a coaxial feedwater pump and an electric feedwater pump connected to the coaxial feedwater pump; the coaxial feedwater pump and the electric feedwater pump are used to supply water to the boiler; the boiler is initially supplied with water by the electric feedwater pump; The method comprises: Real-time acquisition of load, operating status, and measurement point data of the steam turbine coaxial drive feedwater pump system; Determine whether the operating state of the steam turbine coaxial drive feedwater pump system and the measurement data of the measuring points meet the steam turbine start-up conditions, and if so, control the speed control system to send a start signal to the steam turbine; the steam turbine start-up conditions include: the operating state of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than a first preset pressure, and the speed control system does not receive an alarm signal or a trip signal; After the steam turbine is started, the operating state of the steam turbine coaxial drive feed water pump system and the measurement data of the measuring points are judged to determine whether they meet the coaxial feed water pump start-up conditions. If so, a start-up signal is sent to the coaxial feed water pump to control the coaxial feed water pump to start. The coaxial feed water pump start-up conditions include: the operating state of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than the second preset pressure, and the speed control system has not received an alarm signal or a trip signal; After the coaxial feedwater pump is started, the coaxial feedwater pump paralleling program is called and executed according to the operating status of the steam turbine coaxial drive feedwater pump system and the measurement data of the measuring points; the coaxial feedwater pump paralleling program is used to control the coaxial feedwater pump to replace the electric feedwater pump to supply water to the boiler; According to the load of the steam turbine coaxial drive feed water pump system, the speed of the coaxial feed water pump is controlled until the coaxial feed water pump reaches the rated operating condition.

2. The method according to claim 1, wherein The speed control system includes: an input end gear set, a hydraulic torque converter, a disc brake, a hydraulic brake, a planetary gear set, a lubricating oil pump, a working oil pump, a hydraulic coupler, an input shaft, an output shaft, a diaphragm coupling, and an interlocking brake unit; The feed water pump system also includes a coaxial feed water pump pre-pump, an electric feed water pump pre-pump, a deaerator, a coaxial feed water pump inlet electric door, a coaxial feed water pump outlet electric door, a coaxial feed water pump recirculation regulating valve, front and rear electric doors of the coaxial feed water pump recirculation regulating valve, an electric feed water pump inlet electric door, an electric feed water pump outlet electric door, an electric feed water pump recirculation regulating valve, front and rear electric doors of the electric feed water pump recirculation regulating valve, and a water supply main pipe; The steam turbine is coaxially connected to the input-end gear set via an input shaft. The turbine's shaft power is transmitted through the input-end gear set and then divided into two shafts. One shaft is sequentially connected to the working oil pump, the torque converter, the hydraulic brake, and the planetary gear set; the other shaft is sequentially connected to the lubricating oil pump, the hydraulic coupling, the diaphragm coupling, the planetary gear set, the disc brake, and the output shaft. The interlocking brake unit is respectively connected to each device in the speed control system and is used to perform maintenance on each device in the speed control system. The output shaft of the speed control system is coaxially connected to the input end of the coaxial feed water pump, and the deaerator outlet is divided into two routes: one route is connected to the coaxial feed water pump pre-pump and the coaxial feed water pump in sequence through the coaxial feed water pump inlet electric door, and the coaxial feed water pump outlet is divided into two routes, one route passes through the coaxial feed water pump recirculation regulating valve front electric door, the coaxial feed water pump recirculation regulating valve and the coaxial feed water pump recirculation regulating valve rear electric door and then returns to the deaerator, and the other route passes through the coaxial feed water pump outlet door and merges with the electric feed water pump outlet feed water before going to the heater; the other route of the deaerator outlet is connected to the electric feed water pump pre-pump and the electric feed water pump through the electric feed water pump inlet electric door in sequence, and the electric feed water pump outlet is divided into two routes, one route passes through the electric feed water pump recirculation regulating valve front electric door, the electric feed water pump recirculation regulating valve and the electric feed water pump recirculation regulating valve rear electric door and then returns to the deaerator, and the other route passes through the electric feed water pump outlet door and merges with the coaxial feed water pump outlet through the feed water main pipe and then goes to the heater.

3. The method according to claim 2, wherein The speed control system also includes a first solenoid valve connected to the disc brake, a second solenoid valve connected to the hydraulic coupler, a third solenoid valve, a fourth solenoid valve connected to the diaphragm coupling, a fifth solenoid valve connected to the hydraulic torque converter, and a sixth solenoid valve connected to the hydraulic brake.

4. The method according to claim 3, wherein The measurement data of the measuring points specifically include: pressure data of the pressure measuring point, speed data of the speed measuring point, and opening data of the valve measuring point.

5. The method according to claim 4, wherein The pressure measurement points include: water supply from the outlet of the coaxial water pump, water supply from the outlet of the electric water pump, water supply from the main water pipe, control oil of the diaphragm coupling, lubricating oil in the speed control system, and working oil of the torque converter, or any combination thereof; Speed ​​measurement points include: coaxial feed water pump, electric feed water pump, speed control system input shaft, planetary gear set, speed control system output shaft, speed control system, steam turbine, or any combination thereof; The valve measurement points include: electric doors before and after the electric water feed pump recirculation, coaxial water feed pump recirculation regulating valve, electric doors before and after the coaxial water feed pump recirculation regulating valve, electric water feed pump recirculation regulating valve, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve, sixth solenoid valve, electric gate valve for the front pump inlet, scoop tube for the hydraulic coupling, guide vane for the torque converter, one or any combination of the water feed pump recirculation pipeline regulating valve.

6. The method according to claim 5, wherein Before controlling the turbine startup, it also includes: Control the front and rear electric doors of the electric water supply pump recirculation regulating valve to open, and control the electric water supply pump recirculation regulating valve to be in the automatic position; the electric water supply pump recirculation regulating valve being in the automatic position means: adjusting its own opening according to the inlet water flow of the electric water supply pump; Control the coaxial water feed pump recirculation regulating valve and the front and rear electric doors of the coaxial water feed pump recirculation regulating valve to fully open; Reset the solenoid valve of the speed control system.

7. The method according to claim 5, wherein The steam turbine startup conditions also include the following conditions: the pressure of the diaphragm coupling control oil is less than a third preset pressure, and the interlocking brake unit is in a released state.

8. The method according to claim 7, wherein The starting conditions of the coaxial water pump also include the following conditions: the input shaft speed is greater than the first preset speed, the pressure of the diaphragm coupling control oil is less than the fourth preset pressure, the interlocking brake unit is in the released state, and the pressure of the torque converter working oil is less than the fifth preset pressure.

9. The method according to claim 6, wherein The coaxial feed water pump paralleling procedure includes: Control the recirculation regulating valve of the coaxial water feed pump and the recirculation regulating valve of the electric water feed pump to the automatic position; the recirculation regulating valve of the coaxial water feed pump is placed in the automatic position, which means that the opening degree thereof is adjusted according to the inlet water flow of the coaxial water feed pump; Controlling the coaxial water supply pump to increase speed at a rate lower than the first preset rate until the difference between the water supply pressure at the outlet of the coaxial water supply pump and the water supply pressure at the outlet of the electric water supply pump is less than the first preset difference and the difference between the water supply pressure at the outlet of the coaxial water supply pump and the water supply main pipe pressure is less than the second preset difference; Controlling the electric door of the coaxial water pump outlet to open to full open at a second preset rate; Control the coaxial water supply pump to increase the speed to a second preset speed and the electric water supply pump to decrease the speed to a third preset speed; If the difference between the outlet water pressure of the coaxial water supply pump and the outlet water pressure of the electric water supply pump is greater than the third preset difference, and the difference between the main water supply pipe pressure and the outlet water pressure of the electric water supply pump is greater than the fourth preset difference, the electric door at the outlet of the electric water supply pump is controlled to close at the third preset rate; When the electric door at the outlet of the electric water supply pump is fully closed, the electric water supply pump is controlled to stop running.

10. The method according to claim 5, wherein According to the load of the steam turbine coaxial drive feedwater pump system, control the speed of the coaxial feedwater pump until the coaxial feedwater pump reaches the rated operating condition, including: According to the load of the steam turbine coaxial drive feedwater pump system, the speed of the coaxial feedwater pump is adjusted through the hydraulic coupling; When the opening of the scoop tube of the hydraulic coupling is greater than the first preset opening, the third solenoid valve is controlled to close, the fifth solenoid valve is controlled to open, the sixth solenoid valve is controlled to close, and the fourth solenoid valve is controlled to open in sequence; After the working oil of the hydraulic coupling is drained, the front and rear rotors of the hydraulic coupling are mechanically coupled through the diaphragm coupling, and the hydraulic brake is controlled to disengage the braking position; The speed of the coaxial water feed pump is adjusted by the hydraulic torque converter until the coaxial water feed pump reaches the rated operating condition.

11. The method according to claim 1, wherein Before the steam turbine is started, it also includes: Get the parameters of the steam turbine; Control the equipment in the steam turbine coaxial drive feedwater pump system except the speed control system, and send the start signal to the steam turbine; When the parameters of the steam turbine meet the preset starting conditions and the steam turbine obtains the starting signal of all equipment in the steam turbine coaxial drive feed water pump system, the steam turbine is controlled to start.

12. A coaxial water pump start-up control device, characterized in that: Applicable to a controller; the controller is connected to a steam turbine coaxial drive feedwater pump system; The steam turbine coaxially driven feedwater pump system includes: a steam turbine, a speed control system, a feedwater pump system, and a boiler; the speed control system is connected to the steam turbine and the feedwater pump system respectively, and is used to adjust the speed of the feedwater pump system; the steam turbine is used to drive the feedwater pump system; the feedwater pump system includes a coaxial feedwater pump and an electric feedwater pump connected to the coaxial feedwater pump; the coaxial feedwater pump and the electric feedwater pump are used to supply water to the boiler; the boiler is initially supplied with water by the electric feedwater pump; The device comprises: Acquisition module, used to obtain real-time measurement data of the load, operating status, and measurement points of the steam turbine coaxial drive feedwater pump system; The steam turbine starting module is used to determine the operating status of the steam turbine coaxial drive feedwater pump system and whether the measurement data of the measuring points meet the steam turbine starting conditions. If so, it controls the speed control system to send a starting signal to the steam turbine. The steam turbine starting conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than a first preset pressure, and the speed control system has not received an alarm signal or a trip signal; The coaxial feedwater pump starting module is used to determine whether the operating status of the coaxial drive feedwater pump system of the steam turbine and the measurement data of the measuring points meet the coaxial feedwater pump starting conditions after the steam turbine is started. If so, a starting signal is sent to the coaxial feedwater pump to control the coaxial feedwater pump to start. The coaxial feedwater pump starting conditions include: the operating status of the speed control system is not in the test mode, the lubricating oil pressure of the speed control system is greater than the second preset pressure, and the speed control system has not received an alarm signal or a trip signal; The parallel pump module is used to call and execute the parallel pump program of the coaxial feedwater pump after the coaxial feedwater pump is started, based on the load, operating status and measurement data of the measuring point of the coaxial drive feedwater pump system of the steam turbine; the parallel pump program of the coaxial feedwater pump is used to control the coaxial feedwater pump to replace the electric feedwater pump to supply water to the boiler; The control module is used to control the speed of the coaxial feedwater pump according to the load of the steam turbine coaxial drive feedwater pump system until the coaxial feedwater pump reaches the rated operating condition.

13. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 11 is implemented.

14. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 11 is implemented.

15. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 11 is implemented.

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