An intelligent speed control system for steam turbine units

Abstract

The present invention discloses an intelligent speed control system for a steam turbine unit, comprising a steam turbine unit and an intelligent speed control controller, wherein the intelligent speed control controller is controlled and connected to the steam turbine unit. The present invention can realize functions such as one-key startup, automatic warm-up, load regulation, adaptive adjustment of speed control parameters, and intelligent control of the steam turbine unit, replace the currently complex independent controllers, reduce the failure rate, and reduce the equipment maintenance cost, thereby realizing a fully automatic intelligent control mode and improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine unit control, and in particular to an intelligent speed regulation control system for a steam turbine unit. Background Art

[0002] Domestically imported KKK, SIEMENS, and Elliott steam turbines are equipped with on-site independent overspeed protectors, independent speed controllers, and safety instrument interlock systems. These three devices work independently and are connected together through hard circuits (relays) to achieve steam turbine speed control. The maintenance is complex and the failure rate is high, which brings certain hidden dangers to factory production. It is impossible to achieve remote one-button start of steam turbine units and load control. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide an intelligent speed control system for a steam turbine unit.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] An intelligent speed control system for a steam turbine unit comprises a steam turbine unit and an intelligent speed controller, wherein the intelligent speed controller is controlled and connected to the steam turbine unit;

[0006] The intelligent speed control controller is used to output an interlock shutdown signal to the steam turbine unit when the interlock shutdown is triggered, the main steam valve of the steam turbine unit is closed, and the interlock solenoid valve is de-energized; it is used to output an interlock reset signal to the steam turbine unit when the interlock reset is triggered, and the interlock solenoid valve is energized; it is used to establish a quick oil shut-off, open the quick shut-off valve, and prepare to start the machine when the starting conditions of the steam turbine unit are met; it is used to control the steam turbine to gradually increase the speed from 0 speed to the first-order target speed when a warm-up mode is triggered, start automatic warm-up, and start the automatic start when the opening of the main steam valve is greater than the set value and the speed is lower than the set value It is used to automatically trigger the interlock protection function; when the second-stage warm-up mode is triggered, the steam turbine is controlled to enter the second-order target speed and start automatic warm-up; when the acceleration mode is triggered, the steam turbine is controlled to quickly pass through the critical speed to enter the minimum operating speed, and the critical speed residence time protection function is started to prevent the steam turbine unit from being unable to leave the critical area. Once the critical speed stays for more than the set time, the interlock shutdown is triggered; when starting a normal shutdown, the steam turbine is controlled to start automatically reducing the load to the first-order target speed, and the interlock shutdown is triggered after waiting for the set time.

[0007] Furthermore, the intelligent speed controller is also used to allow an operator to manually set a target speed of the steam turbine or to allow a third-party target value to automatically adjust the steam turbine load when starting a normal operation mode.

[0008] Furthermore, the intelligent speed controller is also used to allow the target speed of the turbine to be set to exceed the normal speed regulation maximum value when starting the overspeed test mode, so as to test whether the safety shutdown function of the turbine unit can be normally triggered when overspeeding.

[0009] Furthermore, the intelligent speed controller is also used to adjust the main steam valve to see whether it meets the linear control index when the static test mode is started and the turbine unit is in an interlocked state.

[0010] The beneficial effects of the present invention are as follows: by utilizing the present invention, functions such as one-key startup, automatic warm-up, load regulation, adaptive adjustment of speed regulation parameters, and intelligent control of the steam turbine unit can be realized, replacing the currently complex independent controllers, reducing the failure rate, and reducing the equipment maintenance cost, thereby realizing a fully automatic intelligent control mode and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the framework of the system of the embodiment of the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0013] This embodiment provides an intelligent speed control system for a steam turbine unit. Figure 1 As shown, it includes a steam turbine unit and an intelligent speed controller, and the intelligent speed controller is controlled and connected to the steam turbine unit;

[0014] The intelligent speed control controller is used to output an interlock shutdown signal to the steam turbine unit when the interlock shutdown is triggered, the main steam valve of the steam turbine unit is closed, and the interlock solenoid valve is de-energized; it is used to output an interlock reset signal to the steam turbine unit when the interlock reset is triggered, and the interlock solenoid valve is energized; it is used to establish a quick oil shut-off, open the quick shut-off valve, and prepare to start the machine when the starting conditions of the steam turbine unit are met; it is used to control the steam turbine to gradually increase the speed from 0 speed to the first-order target speed when a warm-up mode is triggered, start automatic warm-up, and start the automatic start when the opening of the main steam valve is greater than the set value and the speed is lower than the set value It is used to automatically trigger the interlock protection function; when the second-stage warm-up mode is triggered, the steam turbine is controlled to enter the second-order target speed and start automatic warm-up; when the acceleration mode is triggered, the steam turbine is controlled to quickly pass through the critical speed to enter the minimum operating speed, and the critical speed residence time protection function is started to prevent the steam turbine unit from being unable to leave the critical area. Once the critical speed stays for more than the set time, the interlock shutdown is triggered; when starting a normal shutdown, the steam turbine is controlled to start automatically reducing the load to the first-order target speed, and the interlock shutdown is triggered after waiting for the set time.

[0015] It should be noted that the operating speed of the steam turbine is obtained through the speed probe and fed back to the intelligent speed controller. Figure 1 As shown, multiple speed probes can be set, and a speed probe signal selection controller can be set to switch and receive signals from different speed probes.

[0016] In this embodiment, the intelligent speed controller is also used to allow the operator to manually set the target speed of the steam turbine or allow a third-party target value to automatically adjust the steam turbine load when starting the normal operation mode.

[0017] In this embodiment, the intelligent speed controller is also used to allow the target speed of the turbine to be set to exceed the normal speed maximum value when starting the overspeed test mode, so as to test whether the safety shutdown function of the turbine unit can be normally triggered when overspeeding.

[0018] In this embodiment, the intelligent speed controller is also used to adjust the main steam valve to see whether it meets the linear control index when the static test mode is started and the turbine unit is in an interlocked state.

[0019] It should be noted that if Figure 1 As shown, various start signals and parameter settings can be input into the intelligent speed controller through the on-site operation panel or DCS system.

[0020] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the present invention.

Claims

1. An intelligent speed control system for a steam turbine unit, characterized in that: It comprises a steam turbine unit and an intelligent speed regulating controller, wherein the intelligent speed regulating controller is controlled and connected to the steam turbine unit; The intelligent speed control controller is used to output an interlock shutdown signal to the steam turbine unit when the interlock shutdown is triggered, the main steam valve of the steam turbine unit is closed, and the interlock solenoid valve loses power; when the interlock reset is triggered, the interlock reset signal is output to the steam turbine unit, and the interlock solenoid valve is energized; when the starting conditions of the steam turbine unit are met, the quick oil shut-off is established, the quick shut-off valve is opened, and preparations are made for starting the machine; when the first-stage warm-up mode is triggered, the steam turbine is controlled to gradually increase the speed from 0 to the first-order target speed, and automatic warm-up is started, and the function of automatically triggering the interlock protection when the opening of the main steam valve is greater than the set value and the speed is lower than the set value is started; when the second-stage warm-up mode is triggered, the steam turbine is controlled to enter the second-order target speed and start automatic warm-up; when the acceleration mode is triggered, the steam turbine is controlled to quickly pass through the critical speed to enter the minimum working speed, and the steam turbine unit is activated. The critical speed retention time protection function prevents the steam turbine unit from being unable to leave the critical area. Once the critical speed stays for more than the set time, the interlock shutdown is triggered; It is used to control the steam turbine to automatically reduce the load to the first-order target speed when starting a normal shutdown, and trigger an interlock shutdown after waiting for the set time.

2. The intelligent speed control system of a steam turbine unit according to claim 1 is characterized in that: The intelligent speed controller is also used to allow an operator to manually set a target speed of the steam turbine or to allow a third-party target value to automatically adjust the steam turbine load when starting a normal operating mode.

3. The intelligent speed control system of a steam turbine unit according to claim 1 is characterized in that: The intelligent speed controller is also used to allow the target speed of the steam turbine to be set to exceed the normal speed maximum value when starting the overspeed test mode, so as to test whether the safety shutdown function of the steam turbine unit can be normally triggered when overspeeding.

4. The intelligent speed control system of a steam turbine unit according to claim 1 is characterized in that: The intelligent speed controller is also used to adjust the main steam valve to see whether it meets the linear control index when the static test mode is started and the steam turbine unit is in an interlocked state.

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