Starting process control method and device applied to small and medium-sized gas turbines
By designing a gas turbine starting process control device and method containing multiple modules, the shortcomings of sequential start control of small and medium-sized gas turbines are solved, and the coordination and coordination of various components of the gas turbine and the safe operation of the unit are realized.
Patent Information
- Application Number
- CN202411728279.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-04-25
AI Technical Summary
There is a lack of effective methods and devices for sequential start-up control of small and medium-sized gas turbines in the prior art, resulting in unstable starting process and prone to failures and safety hazards.
A starting process control device and method including a lubricant module, a fuel module, a start-up module, a control module, a time counter module and a pneumatic control module is designed. By automatically controlling the operation of each module, the sequential start-up and safe operation of the gas turbine are realized.
Through automated operation, the method and device ensure the coordination and cooperation of the various components of the gas engine, realize the flexible start and safe operation of the unit, and avoid the faults and dangers caused by improper start.
Smart Images
Figure CN119878379A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a starting process control method and device applied to small and medium-sized gas turbines. Background Art
[0002] Gas turbine sequential start control is a key link to ensure stable and efficient operation of gas turbines. It involves the coordinated cooperation of multiple components and modules of gas turbines to ensure that during the start-up of the gas turbine, each component and module performs the corresponding operations in the correct sequence to avoid the occurrence of faults and reduce the impact of human error operations, thereby improving the reliability, applicability and operability of the unit.
[0003] There are many studies on the sequential start control methods and devices for gas turbines abroad, but China started late. There are more studies on the sequential start control of heavy-duty gas turbines, and fewer studies on the sequential start methods and devices for small and medium-sized gas turbines. Therefore, it is of great significance to study the sequential start methods and devices applied to small and medium-sized gas turbines. Summary of the invention
[0004] The purpose of the present invention is to solve the above-mentioned problems and to provide a method and device for controlling the starting process of small and medium-sized gas turbines.
[0005] The above purpose is achieved through the following technical solutions: A starting process control device for small and medium-sized gas turbines, comprising: a lubricating oil module, a fuel module, a starting module, a control module, a time counter module and a pneumatic control module; The lubricating oil module is used to automatically control the opening of the lubricating oil supply and return pump and the opening of the lubricating oil heater; The fuel module is used to automatically control the opening of the fuel supply pump; The pneumatic control module is used to automatically control the opening of the compressed air supply valve; The starting module is used to automatically start the frequency converter; The time counter module is used for step sequence timing.
[0006] A control method for a start-up process control device applied to a small and medium-sized gas turbine, the method comprising the following steps: (1) When the oil seal release mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the fuel module and the control module start to set the target speed of the starter motor to the oil seal release speed, and perform the command operation. When the engine speed reaches the oil seal release speed, the oil seal release operation is performed; (2) When the oil seal mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the fuel module and the control module start to set the target speed of the starter motor to the oil seal speed and perform the command operation. When the engine speed reaches the oil seal speed, the oil seal operation is performed; (3) When the cold blow mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the control module and the starting module start to set the target speed of the starting motor to the cold blow speed and perform the command operation. When the engine speed reaches the cold blow speed, the cold blow operation is performed; (4) When the water washing mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the control module and the starting module start to set the target speed of the starting motor to the water washing speed and perform the command operation. When the engine speed reaches the water washing speed, the water washing operation is performed; (5) When the start mode is selected, the oil module automatically controls to open the oil supply and return pumps and the oil heater. The fuel module automatically controls to open the fuel supply pump. When the start signal is met, the control module, the start module, and the time counter module are started in sequence to perform purging. When the purge program execution time reaches the set time, the control module, the start module, the time counter module, and the fuel module automatically control to open the igniter, and the oil supply pump and the air supply valve. The fuel module automatically controls to open the fuel regulating valve to the specified opening according to the rules until the ignition is successful.
[0007] The control method of a starting process control device for a small and medium-sized gas turbine, the step (1) is specifically as follows: when the oil seal release mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and the fuel module automatically controls to open the fuel supply pump. When the oil seal release signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the target speed of the starter motor to the oil seal release speed, and sends a speed increase instruction. At the same time, the fuel module automatically controls to open the fuel valve. When the engine speed reaches the oil seal release speed, the time counter module is triggered and the step timing starts. When the execution time of the oil seal release program reaches the set time, the time counter module stops and the oil seal release is completed.
[0008] The control method of the starting process control device applied to small and medium-sized gas turbines, the step (2) is specifically as follows: when the oil seal mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and the fuel module automatically controls to open the anti-corrosion oil supply valve. When the oil seal signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the target speed of the starter motor to the oil seal speed, and sends a speed increase instruction. At the same time, the fuel module automatically controls to open the fuel valve. When the engine speed reaches the oil seal speed, the time counter module is triggered and the step timing starts. When the oil seal program execution time reaches the set time, the time counter module stops and the oil seal is completed.
[0009] The control method of a starting process control device for a small and medium-sized gas turbine, the step (3) is specifically as follows: when the cold blowing mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, and turns on the lubricating oil heater. When the cold blowing signal is met, the control module automatically triggers the next sequence control module, the starting module automatically starts the inverter, sets the target speed of the starting motor to the cold blowing speed, and sends a speed increase instruction. When the engine speed reaches the cold blowing speed, the time counter module is triggered, and the step timing starts. When the execution time of the cold blowing program reaches the set time, the time counter module stops, and the cold blowing is completed.
[0010] The control method of a starting process control device for a small and medium-sized gas turbine, the step (4) is specifically as follows: when the water washing mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, and turns on the lubricating oil heater. When the water washing signal is met, the control module automatically triggers the next sequence control module, the starting module automatically starts the inverter, sets the target speed of the starting motor to the water washing speed, and sends a speed increase instruction. When the engine speed reaches the water washing speed, the water washing valve is opened, the water washing pump is turned on, and the time counter module is triggered at the same time, and the step timing starts. When the water washing program execution time reaches the set time, the time counter module stops and the water washing is completed.
[0011] In the control method for a start-up process control device applied to a small and medium-sized gas turbine, in the step (5), the control module will automatically determine whether the ignition is successful. If so, the sequential start of the start-up mode is completed; if not, the engine is tripped, the start-up program is exited, and processing is awaited. Beneficial Effects
[0012] 1. The present invention includes mode selection, automatic judgment of whether the starting conditions are met, execution of the starting program, automatic judgment of the tripping protection system, and automatic judgment of whether the XX mode is completed. The sequential starting method ensures the coordination of various components of the gas turbine on the one hand, and realizes flexible starting and safe operation of the unit on the other hand, and fully automated operation, avoiding failures and dangers caused by improper starting. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a sequential start-up flow chart of the present invention; Figure 2 This is a flowchart for executing startup in each mode. DETAILED DESCRIPTION
[0014] A starting process control device for small and medium-sized gas turbines, comprising: a lubricating oil module, a fuel module, a starting module, a control module, a time counter module and a pneumatic control module; The lubricating oil module is used to automatically control the opening of the lubricating oil supply and return pump and the opening of the lubricating oil heater; The fuel module is used to automatically control the opening of the fuel supply pump; The pneumatic control module is used to automatically control the opening of the compressed air supply valve; The starting module is used to automatically start the frequency converter; The time counter module is used for step sequence timing.
[0015] Reference Figure 1 ,The present invention is an automatic sequential starting method, including five starting modes: oil seal release mode, oil seal mode, cold blow mode, start mode and water wash mode; After selecting the start mode you want to run, the method can automatically perform the subsequent steps in sequence: by automatically obtaining the parameters of each gas turbine sensor and actuator, automatically determine whether the start condition is met, if not, an alarm will be issued, and the condition item will be displayed as met, and reset to the initial position. If it is met, the selected start mode will be automatically executed, and in the process, track and determine whether the trip item is triggered. If triggered, the emergency shutdown will be performed, and the trip reason will be displayed. The start program will be immediately exited, waiting for personnel to handle it. After the processing is completed, it will be reset to the initial state. If it is not triggered, the start mode is completed.
[0016] The difference between the starting mode and the starting mode is as follows: the starting mode includes the starting mode, the starting mode refers to the mode in which the engine goes from stationary to rotating, which includes five modes, while the starting mode refers to the process in which the engine goes from stationary to ignition and then to slow-running condition.
[0017] The starting conditions mentioned above are characterized in that the engine body and its accessories such as the fuel system, lubricating oil system, pneumatic control system, starting system, and control system must meet the specified conditions before the engine can be started in sequence. The starting conditions met are as follows: the starting system is powered and normal, the lubricating oil system is supplied with oil and the oil pressure and oil temperature are normal, the fuel system valve position is normal, the engine body speed is lower than the set value, and the pneumatic control system is supplied with air and the pressure is normal (only required for the starting mode) The execution of the XX mode start-up procedure is characterized in that the unit must execute the corresponding procedures of each module in a specific order according to the actual situation on site. The specific operation execution mechanism is shown in Figure 2 The various modes described are defined as follows: Oil seal mode: only applicable to the engine that will not be used for a long time, and its fuel device needs to be oil sealed to prevent rust and corrosion and reduce service life; Oil seal release mode: only applicable to the oil seal state of the fuel oil device of the gas engine, and used to unseal the oil seal of the fuel oil device of the gas engine; Cold blowing mode: Applicable to before starting, after starting or oil seal failure, and after shutdown of the gas turbine. The cold blowing before starting is to listen to the sound of the low-pressure rotor and its driven components; the cold blowing after ignition or oil seal failure is to eliminate the lubricating oil and fuel in the flow part, which are the residual oil after the oil seal failure of the fuel device or the failure of starting; after emergency shutdown, in order to cool the gas turbine, cold blowing sequence control will also be performed.
[0018] Water washing mode: when the flow part of the gas turbine is contaminated and the specified parameters exceed the allowable value, the flow part is cleaned; Startup mode: It is the sequential logic control of the entire startup process of the gas turbine, from inverter startup, driving the turbine rotor to rotate, turbine ignition, rotor acceleration until reaching slow speed.
[0019] The trip item is a protection function for the unit under normal and emergency conditions, including main body protection and auxiliary protection functions (fuel system protection, lubricating oil system protection, air system protection, starting system protection). If the trip item is triggered under protection conditions, the engine will immediately shut down and exit the starting procedure.
[0020] The control method for a start-up process control device applied to a small and medium-sized gas turbine is characterized in that the method comprises the following steps: (1) When the oil seal release mode is selected, the lubricating oil module automatically controls the opening of the lubricating oil supply and return pump, the oil heater, and the fuel module automatically controls the opening of the fuel supply pump. When the oil seal release signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the target speed of the starter motor to the oil seal release speed, and sends a speed increase command. At the same time, the fuel module automatically controls the opening of the fuel valve. When the engine speed reaches the oil seal release speed, the time counter module is triggered and the step timing starts. When the execution time of the oil seal release program reaches the set time, the time counter module stops and the oil seal release is completed; (2) When the oil seal mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and the fuel module automatically controls to open the anti-corrosion oil supply valve. When the oil seal signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the target speed of the starter motor to the oil seal speed, and sends a speed increase command. At the same time, the fuel module automatically controls to open the fuel valve. When the engine speed reaches the oil seal speed, the time counter module is triggered and the step timing starts. When the oil seal program execution time reaches the set time, the time counter module stops and the oil seal is completed. (3) When the cold blow mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump and turn on the lubricating oil heater. When the cold blow signal is met, the control module automatically triggers the next sequence control module, and the start module automatically starts the inverter, sets the target speed of the starter motor to the cold blow speed, and sends a speed increase command. When the engine speed reaches the cold blow speed, the time counter module is triggered and the step timing starts. When the cold blow program execution time reaches the set time, the time counter module stops and the cold blow is completed. (4) When the water washing mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump and the lubricating oil heater. When the water washing signal is met, the control module automatically triggers the next sequence control module, and the starting module automatically starts the inverter, sets the target speed of the starting motor to the water washing speed, and sends a speed increase command. When the engine speed reaches the water washing speed, the water washing valve is opened, the water washing pump is turned on, and the time counter module is triggered at the same time, and the step timing starts. When the water washing program execution time reaches the set time, the time counter module stops and the water washing is completed; (5) When the start mode is selected, the oil module automatically controls the opening of the oil supply and return pumps and the oil heater, the fuel module automatically controls the opening of the fuel supply pump, and the pneumatic control module automatically controls the opening of the compressed air supply valve. When the start signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the start motor target speed to the purge speed, and sends a speed increase command. When the engine speed reaches the purge speed, the time counter module is triggered, and the step timing starts. When the purge program execution time reaches the set time, the control module automatically triggers the next sequence control module. The start module sets the start motor target speed to the ignition speed and sends a speed increase command. When the engine speed reaches the ignition speed, the time counter module is triggered, and the step timing starts. When the program execution time reaches the set time, the control module automatically triggers the next sequence control module. The fuel module automatically controls to open the igniter, open the fuel shut-off valve, open the start oil circuit shut-off valve, open the fuel supply pump, and the pneumatic control module automatically controls to open the air supply valve. After the valve has been opened feedback signal reaches 2s, the control module automatically triggers the next sequence control module. The fuel module automatically controls to open the fuel regulating valve to the specified opening according to the rules, as shown in the following formula: Among them, FV is the valve opening; t is the time when fuel filling starts; At the same time, the time counter module is triggered and the step timing starts. During the startup process, if the low-pressure turbine outlet temperature exceeds the limit, the step timing stops, FV remains unchanged, and the control module stops increasing fuel consumption. After the low-pressure turbine outlet temperature drops below the limit value, the control module continues to increase fuel consumption according to formula (1-1) until ignition is successful.
[0021] The control module will automatically determine whether the ignition is successful. If so, the sequential start of the start mode will be completed. If not, the engine will be tripped, the start program will be exited, and wait for processing.
[0022] During the starting process of any mode, the protection system will work. If the trip item is triggered, the control system will act on the inverter and the fuel shut-off valve respectively, disconnect the starting motor, quickly cut off the fuel supply, ensure the safety of the unit, and display the "gas turbine emergency shutdown" signal. According to the fault type displayed by the control system, troubleshoot the fault. After the fault is resolved, reset it to return to the initial position and reselect the mode.
[0023] Figure 2 These are the corresponding operations performed by different modules of the gas turbine in each mode. The operations of the modules described in the figure are in parallel, and there is no order from top to bottom.
[0024] The present invention includes mode selection, automatic judgment of whether the starting conditions are met, execution of the starting program, automatic judgment of the tripping protection system, and automatic judgment of whether the XX mode is completed. The sequential starting method ensures the coordination of various components of the gas turbine on the one hand, and realizes flexible starting and safe operation of the unit on the other hand, and fully automated operation, avoiding failures and dangers caused by improper starting.
Claims
1. A startup process control device for small and medium-sized gas turbines, characterized in that: Its components include: lubricating oil module, fuel module, starting module, control module, time counter module and pneumatic control module; The lubricating oil module is used to automatically control the opening of the lubricating oil supply and return pump and the opening of the lubricating oil heater; The fuel module is used to automatically control the opening of the fuel supply pump; The pneumatic control module is used to automatically control the opening of the compressed air supply valve; The starting module is used to automatically start the frequency converter; The time counter module is used for step sequence timing.
2. A control method for a start-up process control device for a small and medium-sized gas turbine according to claim 1, characterized in that: The method comprises the following steps: (1) When the oil seal release mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the fuel module and the control module start to set the target speed of the starter motor to the oil seal release speed, and perform the command operation. When the engine speed reaches the oil seal release speed, the oil seal release operation is performed; (2) When the oil seal mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the fuel module and the control module start to set the target speed of the starter motor to the oil seal speed and perform the command operation. When the engine speed reaches the oil seal speed, the oil seal operation is performed; (3) When the cold blow mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the control module and the starting module start to set the target speed of the starting motor to the cold blow speed and perform the command operation. When the engine speed reaches the cold blow speed, the cold blow operation is performed; (4) When the water washing mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and at the same time, the control module and the starting module start to set the target speed of the starting motor to the water washing speed and perform the command operation. When the engine speed reaches the water washing speed, the water washing operation is performed; (5) When the start mode is selected, the oil module automatically controls to open the oil supply and return pumps and the oil heater. The fuel module automatically controls to open the fuel supply pump. When the start signal is met, the control module, the start module, and the time counter module are started in sequence to perform purging. When the purge program execution time reaches the set time, the control module, the start module, the time counter module, and the fuel module automatically control to open the igniter, and the oil supply pump and the air supply valve. The fuel module automatically controls to open the fuel regulating valve to the specified opening according to the rules until the ignition is successful.
3. The control method for a startup process control device for a small and medium-sized gas turbine according to claim 2 is characterized in that: The step (1) is specifically as follows: when the oil seal release mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and the fuel module automatically controls to open the fuel supply pump. When the oil seal release signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the target speed of the starter motor to the oil seal release speed, and sends a speed increase instruction. At the same time, the fuel module automatically controls to open the fuel valve. When the engine speed reaches the oil seal release speed, the time counter module is triggered and the step timing starts. When the execution time of the oil seal release program reaches the set time, the time counter module stops and the oil seal release is completed.
4. The control method for a startup process control device for a small and medium-sized gas turbine according to claim 2 is characterized by: The step (2) is specifically as follows: when the oil seal mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, turns on the lubricating oil heater, and the fuel module automatically controls to open the anti-corrosion oil supply valve. When the oil seal signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the starter motor target speed to the oil seal speed, and sends a speed increase instruction. At the same time, the fuel module automatically controls to open the fuel valve. When the engine speed reaches the oil seal speed, the time counter module is triggered and the step timing starts. When the oil seal program execution time reaches the set time, the time counter module stops and the oil seal is completed.
5. The control method for a startup process control device for a small and medium-sized gas turbine according to claim 2 is characterized by: The step (3) is specifically as follows: when the cold blowing mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, and turns on the lubricating oil heater. When the cold blowing signal is met, the control module automatically triggers the next sequence control module, the starting module automatically starts the inverter, sets the target speed of the starting motor to the cold blowing speed, and sends a speed increase instruction. When the engine speed reaches the cold blowing speed, the time counter module is triggered, and the step timing starts. When the execution time of the cold blowing program reaches the set time, the time counter module stops, and the cold blowing is completed.
6. The control method for a startup process control device for a small and medium-sized gas turbine according to claim 2 is characterized by: The step (4) is specifically as follows: when the water washing mode is selected, the lubricating oil module automatically controls to open the lubricating oil supply and return pump, and turns on the lubricating oil heater. When the water washing signal is met, the control module automatically triggers the next sequence control module, the start module automatically starts the inverter, sets the starter motor target speed to the water washing speed, and sends a speed increase instruction. When the engine speed reaches the water washing speed, the water washing valve is opened, the water washing pump is turned on, and the time counter module is triggered at the same time, and the step timing starts. When the water washing program execution time reaches the set time, the time counter module stops, and the water washing is completed.
7. The control method for a startup process control device for a small and medium-sized gas turbine according to claim 2 is characterized by: In step (5), the control module will automatically determine whether the ignition is successful. If so, the sequential start of the start mode is completed. If not, the engine is tripped, the start program is exited, and processing is awaited.