Emergency security and adjustment control system for industrial driving steam turbine

Abstract

The invention relates to the technical field of steam turbines, in particular to an industrial driving steam turbine emergency security and adjustment control system. The system comprises a valve hydraulic servo-motor hydraulic system, an emergency trip system and an OPC overspeed protection system. Wherein the valve hydraulic servo-motor hydraulic system comprises a main steam valve hydraulic servo-motor hydraulic system and a regulating valve hydraulic servo-motor hydraulic system. The main steam valve hydraulic servo-motor hydraulic system comprises a main steam valve hydraulic servo-motor for controlling opening and closing of a main steam valve through a connecting rod; the main steam valve servo pump supplies oil to a power oil cavity of the main steam valve hydraulic servo-motor; and the main steam valve micro oil tank forms a circulating oil path. The regulating valve hydraulic servo-motor hydraulic system comprises a regulating valve hydraulic servo-motor for controlling the opening degree of a regulating valve through a connecting rod; the regulating valve servo pump is used for supplying oil to a power oil cavity of the regulating valve hydraulic servo-motor; and the regulating valve micro oil tank forms a circulating oil path. The main steam valve servo pump and the adjusting valve servo pump are both controlled by a DEH system to operate. The method can adapt to variable-speed working conditions and can give consideration to quick and safe response.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and in particular to an emergency safety and regulation control system for an industrial driven steam turbine. Background Art

[0002] Industrial drive steam turbines are widely used to power core equipment in steam power generation, such as large induced draft fans and air compressors. These devices require high power, and using steam turbines to drive them can significantly improve energy efficiency and economics.

[0003] However, because driven auxiliary equipment often requires variable speed operation, traditional low-pressure electro-hydraulic control systems relying on turbine spindle pumps (whose oil supply depends on the fixed main engine speed) cannot meet dynamic control requirements. To overcome this limitation, conventional solutions generally use hydraulic control systems with an external, independently controlled oil source. This architecture requires a separate high-pressure oil station, a complex pressure reducing valve assembly, and an oil pipeline network, resulting in limited on-site space, increased installation and maintenance costs, and the risk of leakage and increased energy consumption.

[0004] Therefore, there is an urgent need for an industrial drive steam turbine emergency safety and regulation control system to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the technical problems existing in the prior art and provides an industrial drive steam turbine emergency safety and regulation control system, which can adapt to variable speed working conditions and can take into account rapid and safe response.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: An industrial driven steam turbine emergency safety and regulation control system comprises: a valve oil motor hydraulic system, which includes a main steam valve oil motor hydraulic system and a regulating valve oil motor hydraulic system; The main steam valve oil motor hydraulic system includes: The main steam valve oil motor is mechanically connected to the main steam valve through a connecting rod and is used to control the opening and closing of the main steam valve; A main steam valve servo pump, whose hydraulic oil outlet is connected to the power oil chamber of the main steam valve oil motor, is used to provide hydraulic power; A main steam valve micro oil tank, the oil outlet of which is connected to the oil inlet of the main steam valve servo pump, and the oil inlet of which is connected to the oil return port of the main steam valve oil motor, forming a circulating oil circuit; The regulating valve oil motor hydraulic system includes: The regulating valve oil motor is mechanically connected to the regulating valve through a connecting rod and is used to control the opening of the regulating valve; A regulating valve servo pump, whose hydraulic oil outlet is connected to the power oil chamber of the regulating valve oil motor, is used to provide hydraulic power; A micro oil tank for the regulating valve, the oil outlet of which is connected to the oil inlet of the regulating valve servo pump, and the oil inlet of which is connected to the oil return port of the regulating valve oil motor, forming a circulating oil circuit; The control ends of the main steam valve servo pump and the regulating valve servo pump are connected to a DEH system, and the DEH system controls the operation of the main steam valve servo pump and the regulating valve servo pump.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the valve oil motor hydraulic system also includes: A servo pump control circuit, through which the DEH system is respectively connected to and controls the main steam valve servo pump and the regulating valve servo pump.

[0009] Furthermore, the valve oil motor hydraulic system also includes: A valve position sensor is provided on the main steam valve oil motor and / or the regulating valve oil motor; The valve position feedback circuit connects the valve position sensor and the DEH system, and feeds back the valve position signal to the DEH system. The DEH system controls the operation of the main steam valve servo pump and / or the regulating valve servo pump in a closed loop according to the valve position signal.

[0010] Furthermore, an emergency shutoff system is also included, and the emergency shutoff system includes: AST solenoid valve group and manual shutdown valve set in parallel; The oil circuit outlets of the AST solenoid valve group and the manual shutdown valve are connected to the shut-off oil circuit of the main steam valve oil motor; When any solenoid valve in the AST solenoid valve group is actuated or the manual shutdown valve is actuated, the hydraulic oil in the power oil chamber of the main steam valve oil motor is discharged to close the main steam valve.

[0011] Furthermore, the AST solenoid valve group is composed of multiple parallel AST solenoid valves. The AST solenoid valve is a normally closed type. When the power is off, the oil circuit is opened to discharge the hydraulic oil in the power oil chamber of the main steam valve oil motor.

[0012] Furthermore, the control end of the AST solenoid valve is connected to the ETS system through the AST solenoid valve control circuit. When the ETS system sends a shutdown signal, the power supply of the AST solenoid valve is cut off.

[0013] Furthermore, an OPC overspeed protection system is also included, and the OPC overspeed protection system includes: OPC solenoid valve group set in parallel; The oil circuit outlet of the OPC solenoid valve group is connected to the shut-off oil circuit of the regulating valve oil motor; When any solenoid valve in the OPC solenoid valve group is actuated, the hydraulic oil in the power oil chamber of the regulating valve oil motor is discharged to close the regulating valve.

[0014] Furthermore, the OPC solenoid valve group is composed of a plurality of parallel OPC solenoid valves, and the OPC solenoid valves are normally open. When energized, the oil circuit is opened to discharge the hydraulic oil in the power oil chamber of the regulating valve oil motor.

[0015] Furthermore, the control end of the OPC solenoid valve is simultaneously connected to the DEH system and the ETS system through the OPC solenoid valve control circuit. When the DEH system or the ETS system sends an overspeed protection signal, the OPC solenoid valve is energized.

[0016] The beneficial effects of the present invention are: 1. In the valve oil motor hydraulic system of this embodiment, the main steam valve and the regulating valve are independently configured with closed oil circuits driven by servo pumps, and the hydraulic oil is self-circulated through a micro oil tank, completely eliminating the external control oil station; the servo pump directly drives the oil motor combined with the DEH system closed-loop control, eliminating the hysteresis problem of the traditional hydraulic system and achieving high valve position control accuracy.

[0017] 2. In the emergency shutdown system of this embodiment, two normally closed AST solenoid valves are connected in parallel with a manual shutdown valve for triple redundancy and connected to the main steam valve oil-operated shut-off oil circuit. The operation of any component can drain the oil and shut down the system, meeting 100% shutdown reliability under single fault conditions. The normally closed AST solenoid valve automatically conducts when power is lost, meeting the fail-safe principle. The ETS system directly controls the solenoid valve power supply to achieve millisecond-level emergency shutdown response.

[0018] 3. In the OPC overspeed protection system of this embodiment, dual OPC solenoid valves (normally open) are redundantly connected in parallel, and single point failure does not affect the overspeed protection function; the normally open OPC solenoid valve is activated when energized to avoid the closing of the regulating valve caused by false triggering, and the response time is short, effectively suppressing speed overspeed; the DEH and ETS dual systems cooperate to trigger OPC action, which can cover all overspeed risk scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the steam turbine emergency safety and regulation control system of the present invention.

[0020] Figure 2 It is a schematic diagram of the main steam valve oil motor hydraulic system and emergency shutoff system of the present invention.

[0021] Figure 3 It is a schematic diagram of the regulating valve oil motor hydraulic system and overspeed protection system of the present invention.

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. AST solenoid valve, 2. AST solenoid valve control circuit, 3. Manual shutdown valve, 4. Servo valve control circuit, 5. Main steam valve servo pump, 6. Main steam valve oil motor, 7. Valve position sensor, 8. Valve position sensor feedback circuit, 9. Control valve oil motor, 10. Control valve servo pump, 11. OPC solenoid valve control circuit, 12. OPC solenoid valve, 13. ETS system, 14. DEH system, 15 Steam source, 16. Main steam valve, 17. Control valve, 18. Steam turbine, 19. Generator. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0024] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0025] In the description of this application, the term "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art will recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0026] Example This embodiment provides an industrial drive steam turbine emergency safety and regulation control system, such as Figure 1 As shown, it includes: a valve oil motor hydraulic system, which includes a main steam valve oil motor 6 hydraulic system and a regulating valve oil motor 9 hydraulic system; The main steam valve oil motor 6 hydraulic system includes: The main steam valve oil motor 6 is mechanically connected to the main steam valve 16 through a connecting rod and is used to control the opening and closing of the main steam valve 16; The main steam valve servo pump 5 has its hydraulic oil outlet connected to the power oil chamber of the main steam valve oil motor 6 for providing hydraulic power; The main steam valve 16 mini oil tank has its oil outlet connected to the oil inlet of the main steam valve servo pump 5, and its oil inlet connected to the oil return port of the main steam valve oil motor 6 to form a circulating oil circuit; The hydraulic system of the regulating valve oil motor 9 includes: The regulating valve oil motor 9 is mechanically connected to the regulating valve 17 through a connecting rod and is used to control the opening of the regulating valve 17; The regulating valve servo pump 10 has a hydraulic oil outlet connected to the power oil chamber of the regulating valve oil motor 9 for providing hydraulic power; The oil outlet of the regulating valve 17 is connected to the oil inlet of the regulating valve servo pump 10, and the oil inlet is connected to the oil return port of the regulating valve oil motor 9 to form a circulating oil circuit; The control ends of the main steam valve servo pump 5 and the regulating valve servo pump 10 are connected to a DEH system 14 , and the DEH system 14 controls the operation of the main steam valve servo pump 5 and the regulating valve servo pump 10 .

[0027] The valve oil motor hydraulic system further includes a servo pump control circuit, and the DEH system 14 is connected to and controls the main steam valve servo pump 5 and the regulating valve servo pump 10 respectively through the servo pump control circuit.

[0028] In this embodiment, the valve oil motor hydraulic system includes a main steam valve oil motor 6 hydraulic system and a regulating valve oil motor 9 hydraulic system. The two systems have the same structure, except that the steam valves controlled by the main steam valve oil motor 6 and the regulating valve oil motor 9 are different, one controls the main steam valve 16 and the other controls the regulating valve 17; the connecting rod of the main steam valve oil motor 6 is connected to the main steam valve 16 for controlling the opening and closing of the main steam valve 16; the connecting rod of the regulating valve oil motor 9 is connected to the regulating valve 17 for controlling the valve position of the regulating valve 17.

[0029] In this embodiment, the main steam valve servo pump 5 and the regulating valve servo pump 10 are controlled by the DEH system 14 through their respective servo pump control circuits. These power the main steam valve oil motor 6 and the regulating valve oil motor 9, respectively, through hydraulic oil circuits. Specifically, the DEH system 14 controls the start, stop, and direction of the main steam valve servo pump 5 and the regulating valve servo pump 10, respectively, thereby precisely adjusting the piston displacement of the main steam valve oil motor 6 and the regulating valve oil motor 9.

[0030] like Figure 1As shown, the specific working process of this embodiment is: the high-pressure steam provided by the steam source 15 passes through the main steam valve 16 and the regulating valve 17 in sequence and enters the turbine 18: the main steam valve oil motor 6 drives the main steam valve 16 through the connecting rod to perform full opening or full closing operation to control the steam on and off; the regulating valve oil motor 9 drives the regulating valve 17 through the connecting rod to continuously adjust the opening to control the steam flow; the steam drives the rotor of the steam turbine 18 to rotate and do work, and finally drives the generator 19 to output electrical energy; among them, the main steam valve oil motor 6 and the regulating valve oil motor 9 are respectively provided with hydraulic power by the main steam valve servo pump 5 and the regulating valve servo pump 10 through the closed circulation oil circuit, and both are controlled by the DEH system 14.

[0031] In a preferred embodiment, if Figure 1 As shown, the valve oil motor hydraulic system also includes: A valve position sensor 7 is provided on the main steam valve oil motor 6 and / or the regulating valve oil motor 9; The valve position feedback circuit connects the valve position sensor 7 and the DEH system 14, and feeds back the valve position signal to the DEH system 14. The DEH system 14 controls the operation of the main steam valve servo pump 5 and / or the regulating valve servo pump 10 in a closed loop according to the valve position signal.

[0032] In this embodiment, both the main steam valve oil motor 6 and the regulating valve oil motor 9 are equipped with valve position sensors 7. The valve position signals collected by the valve position sensors 7 are sent to the DEH system 14 through the valve position feedback circuit, forming a feedback loop to assist the DEH system 14 in controlling the operation of the main steam valve servo pump 5 and the regulating valve servo pump 10.

[0033] In a preferred embodiment, an emergency trip system is also included, such as Figure 2 As shown, the emergency shutoff system includes: AST solenoid valve group and manual shutdown valve 3 arranged in parallel; The oil outlets of the AST solenoid valve group and the manual shutdown valve 3 are connected to the shut-off oil circuit of the main steam valve oil motor 6; When any solenoid valve in the AST solenoid valve group is actuated or the manual shutdown valve 3 is actuated, the hydraulic oil in the power oil chamber of the main steam valve oil motor 6 is discharged to close the main steam valve 16.

[0034] Specifically, the AST solenoid valve group is composed of multiple parallel AST solenoid valves 1. The AST solenoid valve 1 is a normally closed type. When the power is off, the oil circuit is opened to discharge the hydraulic oil in the power oil chamber of the main steam valve oil motor 6.

[0035] Specifically, the control end of the AST solenoid valve 1 is connected to the ETS system 13 through the AST solenoid valve control circuit 2. When the ETS system 13 sends a shutdown signal, the power supply of the AST solenoid valve 1 is cut off.

[0036] In this embodiment, the AST solenoid valve assembly consists of two parallel AST solenoid valves 1. The two AST solenoid valves 1 and the oil outlet of the manual shutdown valve 3 are connected in parallel to the hydraulic oil circuit of the main steam valve oil motor 6. The AST solenoid valves 1 are controlled by the ETS system 13. When either of the two AST solenoid valves 1 or the manual shutdown valve 3 is actuated, the hydraulic oil of the main steam valve oil motor 6 is released, closing the main steam valve 16.

[0037] This embodiment adopts two normally closed AST solenoid valves 1 and a manual shutdown valve 3 in parallel with triple redundancy, which are connected to the main steam valve oil motor 6 to shut off the oil circuit; any component can drain the oil and shut down, meeting 100% isolation reliability under single fault; the normally closed AST solenoid valve 1 automatically conducts when power is lost, meeting the fault safety principle; the ETS system 13 directly controls the solenoid valve power supply to achieve millisecond-level emergency shutdown response action.

[0038] In a preferred embodiment, an OPC overspeed protection system is also included, such as Figure 3 As shown, the OPC overspeed protection system includes: OPC solenoid valve group set in parallel; The oil circuit outlet of the OPC solenoid valve group is connected to the shut-off oil circuit of the regulating valve oil motor 9; When any solenoid valve in the OPC solenoid valve group is actuated, the hydraulic oil in the power oil chamber of the regulating valve oil motor 9 is released, so that the regulating valve 17 is closed.

[0039] Specifically, the OPC solenoid valve group is composed of a plurality of parallel OPC solenoid valves 12. The OPC solenoid valve 12 is a normally open type. When energized, the oil circuit is opened to discharge the hydraulic oil in the power oil chamber of the regulating valve oil motor 9.

[0040] Specifically, the control end of the OPC solenoid valve 12 is simultaneously connected to the DEH system 14 and the ETS system 13 through the OPC solenoid valve control circuit 11. When the DEH system 14 or the ETS system 13 sends an overspeed protection signal, the OPC solenoid valve 12 is energized.

[0041] In this embodiment, the OPC solenoid valve assembly consists of two parallel OPC solenoid valves 12. The oil circuits of these two OPC solenoid valves 12 are connected in parallel to the hydraulic circuit of the control valve motor 9. The OPC solenoid valves 12 are controlled by both the DEH system 14 and the ETS system 13. When either the DEH system 14 or the ETS system 13 issues an actuation signal, either OPC solenoid valve 12 actuates, releasing the hydraulic oil from the control valve motor 9 and closing the control valve 17.

[0042] This embodiment adopts dual OPC solenoid valves 12 (normally open) in redundant parallel connection, and single point failure does not affect the overspeed protection function; the normally open OPC solenoid valve 12 is activated when energized to avoid the closing of the regulating valve 17 caused by false triggering, and the response time is short, effectively suppressing speed overspeed; the DEH and ETS dual systems cooperate to trigger the OPC action, which can cover all overspeed risk scenarios.

[0043] The operation process of this embodiment is as follows: 1. Before starting the steam turbine 18, the AST solenoid valve group is controlled by the ETS system 13 and is energized, with the oil circuit remaining closed. The manual shutdown valve 3 is in its initial reset state. The oil pressure in the power oil chamber of the main steam valve motor 6 is established. The OPC solenoid valve group is de-energized, with the oil circuit remaining closed. The oil pressure in the power oil chamber of the regulating valve motor 9 is established.

[0044] 2. The main steam valve servo pump 5 begins operating upon receiving a command from the DEH system 14, supplying oil to the power oil chamber of the main steam valve oil motor 6, driving it to open the main steam valve 16. The DEH system 14 receives the valve position feedback signal from the valve position sensor 7. When the main steam valve 16 reaches a preset opening, it controls the main steam valve servo pump 5 to stop operating, completing the opening of the main steam valve 16.

[0045] 3. After the main steam valve 16 is opened, the regulating valve servo pump 10 begins operating upon command from the DEH system 14, supplying oil to the power oil chamber of the regulating valve motor 9, driving it to open the regulating valve 17. The DEH system 14 receives the valve position feedback signal from the valve position sensor 7 and controls the operating state of the regulating valve servo pump 10 according to a preset speed increase curve, driving the regulating valve motor 9 to open the regulating valve 17 as needed. When the regulating valve 17 reaches the predetermined initial opening, the regulating valve servo pump 10 is controlled to stop, and the opening of the regulating valve 17 is completed.

[0046] 4. When the steam turbine 18 is operating normally, the DEH system 14 controls the operating state (forward / reverse) of the regulating valve servo pump 10 according to the set operating strategy, driving the regulating valve oil motor 9 to open or close the regulating valve 17. When the DEH system 14 adopts the valve position control strategy, the DEH system 14 performs closed-loop control of the opening of the regulating valve 17 based on the valve position signal fed back by the valve position sensor 7.

[0047] 5. When the speed of the steam turbine 18 exceeds 103% of the rated speed, the DEH system 14 controls the OPC solenoid valve group to be energized, the oil circuit is connected, and the hydraulic oil in the power oil chamber of the regulating valve oil motor 9 is discharged, so that the regulating valve 17 is quickly closed.

[0048] 6. When the speed of the steam turbine 18 exceeds 109% of the rated speed (high speed design) or 110% of the rated speed (3000 r / min and below design), the ETS system 13 controls the AST solenoid valve group to be de-energized and the oil circuit is opened. At the same time, the DEH or ETS system 13 controls the OPC solenoid valve group to be energized and the oil circuit is opened; thereby, the hydraulic oil in the power oil chamber of the main steam valve oil motor 6 is discharged, and the main steam valve 16 is closed.

[0049] 7. When other emergency conditions require manual shutdown, operate the manual shutdown valve 3 to activate it, open the oil circuit, discharge the hydraulic oil in the power oil chamber of the main steam valve oil motor 6, and close the main steam valve 16.

[0050] In summary, this embodiment adopts the main steam valve servo pump 5 and the regulating valve servo pump 10 to drive the main steam valve oil motor 6 and the regulating valve oil motor 9 respectively, and constructs a closed circulation oil circuit through the main steam valve 16 micro oil tank and the regulating valve 17 micro oil tank, completely eliminating the independent control oil station; at the same time, through the parallel arrangement of the AST solenoid valve group and the manual shutdown valve 3, any component action can be realized to discharge the hydraulic oil in the power oil chamber of the main steam valve oil motor 6 to close the main steam valve 16, and through the parallel arrangement of the OPC solenoid valve group, the DEH system 14 or the ETS system 13 is triggered to energize and discharge the hydraulic oil in the power oil chamber of the regulating valve oil motor 9 to close the regulating valve 17, forming a highly integrated, redundant and reliable emergency safety and regulation control architecture.

[0051] Although the embodiments or examples of the present disclosure have been described with reference to the accompanying drawings, it should be understood that the above-mentioned methods, systems and devices are merely exemplary embodiments or examples, and the scope of the present invention is not limited by these embodiments or examples, but is only limited by the claims after authorization and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. In addition, the steps may be performed in an order different from that described in this disclosure. Further, the various elements in the embodiments or examples may be combined in various ways. It is important that as technology evolves, many of the elements described herein may be replaced by equivalent elements that appear after this disclosure.

Claims

1. An industrial drive steam turbine emergency safety and regulation control system, characterized in that: include: Valve oil motor hydraulic system, which includes main steam valve oil motor hydraulic system and regulating valve oil motor hydraulic system; The main steam valve oil motor hydraulic system includes: The main steam valve oil motor is mechanically connected to the main steam valve through a connecting rod and is used to control the opening and closing of the main steam valve; A main steam valve servo pump, whose hydraulic oil outlet is connected to the power oil chamber of the main steam valve oil motor, is used to provide hydraulic power; A main steam valve micro oil tank, the oil outlet of which is connected to the oil inlet of the main steam valve servo pump, and the oil inlet of which is connected to the oil return port of the main steam valve oil motor, forming a circulating oil circuit; The regulating valve oil motor hydraulic system includes: The regulating valve oil motor is mechanically connected to the regulating valve through a connecting rod and is used to control the opening of the regulating valve; A regulating valve servo pump, whose hydraulic oil outlet is connected to the power oil chamber of the regulating valve oil motor, is used to provide hydraulic power; A micro oil tank for the regulating valve, the oil outlet of which is connected to the oil inlet of the regulating valve servo pump, and the oil inlet of which is connected to the oil return port of the regulating valve oil motor, forming a circulating oil circuit; The control ends of the main steam valve servo pump and the regulating valve servo pump are connected to a DEH system, and the DEH system controls the operation of the main steam valve servo pump and the regulating valve servo pump.

2. The industrial drive steam turbine emergency safety and regulation control system according to claim 1, characterized in that: The valve oil motor hydraulic system also includes: A servo pump control circuit, through which the DEH system is respectively connected to and controls the main steam valve servo pump and the regulating valve servo pump.

3. The industrial drive steam turbine emergency safety and regulation control system according to claim 1, characterized in that: The valve oil motor hydraulic system also includes: A valve position sensor is provided on the main steam valve oil motor and / or the regulating valve oil motor; The valve position feedback circuit connects the valve position sensor and the DEH system, and feeds back the valve position signal to the DEH system. The DEH system controls the operation of the main steam valve servo pump and / or the regulating valve servo pump in a closed loop according to the valve position signal.

4. The industrial drive steam turbine emergency safety and regulation control system according to claim 1 or 3, characterized in that: The system also includes an emergency shutoff system, the emergency shutoff system comprising: AST solenoid valve group and manual shutdown valve set in parallel; The oil circuit outlets of the AST solenoid valve group and the manual shutdown valve are connected to the shut-off oil circuit of the main steam valve oil motor; When any solenoid valve in the AST solenoid valve group is actuated or the manual shutdown valve is actuated, the hydraulic oil in the power oil chamber of the main steam valve oil motor is discharged to close the main steam valve.

5. The industrial drive steam turbine emergency safety and regulation control system according to claim 4, characterized in that: The AST solenoid valve group is composed of multiple parallel AST solenoid valves. The AST solenoid valve is a normally closed type. When the power is off, the oil circuit is opened to discharge the hydraulic oil in the power oil chamber of the main steam valve oil motor.

6. The industrial drive steam turbine emergency safety and regulation control system according to claim 5, characterized in that: The control end of the AST solenoid valve is connected to the ETS system through the AST solenoid valve control circuit. When the ETS system sends a shutdown signal, the power supply of the AST solenoid valve is cut off.

7. The industrial drive steam turbine emergency safety and regulation control system according to claim 1 or 3, characterized in that: Also included is an OPC overspeed protection system, the OPC overspeed protection system comprising: OPC solenoid valve group set in parallel; The oil circuit outlet of the OPC solenoid valve group is connected to the shut-off oil circuit of the regulating valve oil motor; When any solenoid valve in the OPC solenoid valve group is actuated, the hydraulic oil in the power oil chamber of the regulating valve oil motor is discharged to close the regulating valve.

8. The industrial drive steam turbine emergency safety and regulation control system according to claim 7, characterized in that: The OPC solenoid valve group is composed of multiple parallel OPC solenoid valves. The OPC solenoid valve is a normally open type. When energized, the oil circuit is opened to discharge the hydraulic oil in the power oil chamber of the regulating valve oil motor.

9. The industrial drive steam turbine emergency safety and regulation control system according to claim 8, characterized in that: The control end of the OPC solenoid valve is connected to the DEH system and the ETS system at the same time through the OPC solenoid valve control circuit. When the DEH system or the ETS system sends an overspeed protection signal, the OPC solenoid valve is energized.

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