Hydraulic control system of double-cylinder double-speed steam turbine

Abstract

The utility model discloses a double-cylinder double-speed turbine hydraulic control system which comprises an oil station, an emergency safety device, a first high-pressure energy accumulator, a second high-pressure energy accumulator and a low-pressure energy accumulator, the oil station is connected with a non-pressure oil return pipe, a pressure oil return pipe and a pressure oil pipe, and the emergency safety device is connected with an emergency trip oil pipe and an overspeed protection oil pipe. The first high-pressure energy accumulator and the second high-pressure energy accumulator are connected with a pressure oil pipe and a non-pressure oil return pipe respectively, the low-pressure energy accumulator is connected with the non-pressure oil return pipe and a pressure oil return pipe respectively, and the emergency safety device is further connected with the pressure oil pipe and the non-pressure oil return pipe. The system further comprises an execution mechanism which is connected with the oil station and the emergency security device. The utility model has the beneficial effects that when the running parameters of the steam turbine exceed extreme values, the steam turbine is timely operated and quickly shut down for protection; the system is compact in structure, small in occupied space, stable in operation, reliable in structure and capable of saving cost.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a double-cylinder double-speed steam turbine hydraulic control system. Background Art

[0002] With the continuous improvement of efficient and clean utilization of energy, highly flexible, high-efficiency and low-investment steam turbine groups have become the development trend of power plants, and two-cylinder two-speed steam turbines meet this demand.

[0003] The quick closing valve and regulating valve of each module of the double-cylinder double-speed steam turbine need to be controlled and adjusted by a matching actuator. The existing steam turbine configuration structure is complex, the components are easily damaged, and the operation is unreliable. Utility Model Content

[0004] The utility model aims to provide a double-cylinder double-speed steam turbine hydraulic control system to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-cylinder double-speed steam turbine hydraulic control system, comprising an oil station, a critical safety device, a first high-pressure accumulator, a second high-pressure accumulator and a low-pressure accumulator, the oil station is connected with a non-pressure return oil pipe, a pressurized return oil pipe and a pressure oil pipe, the critical safety device is connected with an emergency trip oil pipe and an overspeed protection oil pipe, the first high-pressure accumulator and the second high-pressure accumulator are respectively connected with a pressure oil pipe and a non-pressure return oil pipe, the low-pressure accumulator is respectively connected with a non-pressure return oil pipe and a pressurized return oil pipe, and the critical safety device is also connected with a pressure oil pipe and a non-pressure return oil pipe;

[0006] It also includes an actuator, which includes a high-pressure quick valve closing oil motor, a high-pressure valve regulating oil motor, a medium-pressure quick valve closing oil motor, a medium-pressure valve regulating oil motor, an air-supply quick valve closing oil motor and an air-supply valve regulating oil motor. The actuator is connected to the oil station and the emergency safety device.

[0007] Preferably, there are two groups of high-pressure quick-valve closing oil motors, and both groups of high-pressure quick-valve closing oil motors are connected to the pressure oil pipe, the pressure return oil pipe and the emergency shut-off oil pipe.

[0008] Preferably, there are four groups of high-pressure valve regulating oil motors, and the four groups of high-pressure valve regulating oil motors are all connected to the overspeed protection oil pipe, the pressure oil pipe and the pressurized return oil pipe.

[0009] Preferably, there are two groups of medium-pressure fast valve closing oil motors, and both groups of medium-pressure fast valve closing oil motors are connected to the emergency shut-off oil pipe, the pressure oil pipe and the pressurized return oil pipe.

[0010] Preferably, there are two groups of medium-pressure valve regulating oil motors, and both groups of medium-pressure valve regulating oil motors are connected to the overspeed protection oil pipe, the pressure oil pipe and the pressurized return oil pipe.

[0011] Preferably, the servomotor of the air admission quick - closing valve is connected to the emergency stop oil pipe, the pressure oil pipe and the pressurized return oil pipe.

[0012] Preferably, the servomotor of the air admission control valve is connected to the overspeed protection oil pipe, the pressure oil pipe and the pressurized return oil pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: by sharing a single oil source for the actuator module, the present utility model saves space; meanwhile, it is equipped with a protection device to quickly shut down the turbine in a timely manner when the operating parameters of the steam turbine exceed the extreme values for protection; this set of system has a compact structure, occupies a small space, operates stably, has a reliable structure and saves costs. Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the module of the present utility model.

[0015] In the figure: 1, oil station; 2, emergency protection device; 3, first high - pressure accumulator; 4, second high - pressure accumulator; 5, low - pressure accumulator; 6, servomotor of high - pressure quick - closing valve; 7, servomotor of high - pressure control valve; 8, servomotor of intermediate - pressure quick - closing valve; 9, servomotor of intermediate - pressure control valve; 10, servomotor of air admission quick - closing valve; 11, servomotor of air admission control valve. Detailed Embodiment

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0017] Please refer to Figure 1 , the present utility model provides a technical solution: a hydraulic control system for a double - cylinder double - speed steam turbine, including an oil station 1, an emergency protection device 2, a first high - pressure accumulator 3, a second high - pressure accumulator 4 and a low - pressure accumulator 5. The oil station 1 is connected to a non - pressurized return oil pipe (DV), a pressurized return oil pipe (DP) and a pressure oil pipe (HP). The emergency protection device is connected to an emergency stop oil pipe (AST) and an overspeed protection oil pipe (OPC). The first high - pressure accumulator and the second high - pressure accumulator are respectively connected to the pressure oil pipe (HP) and the non - pressurized return oil pipe (DV). The low - pressure accumulator is respectively connected to the non - pressurized return oil pipe (DV) and the pressurized return oil pipe (DP). The emergency protection device is also connected to the pressure oil pipe (HP) and the non - pressurized return oil pipe (DV);

[0018] It also includes an actuator which includes a high-pressure quick-closure valve oil motor 6, a high-pressure governing valve oil motor 7, an intermediate-pressure quick-closure valve oil motor 8, an intermediate-pressure governing valve oil motor 9, a make-up gas quick-closure valve oil motor 10 and a make-up gas governing valve oil motor 11. The actuator is connected to the oil station 1 and the emergency protection device 2.

[0019] In an embodiment of the present utility model, there are two groups of high-pressure quick-closure valve oil motors. Both groups of high-pressure quick-closure valve oil motors are connected to the pressure oil pipe (HP), the pressurized return oil pipe (DP) and the emergency trip oil pipe (AST).

[0020] In an embodiment of the present utility model, there are four groups of high-pressure governing valve oil motors. All four groups of high-pressure governing valve oil motors are connected to the overspeed protection oil pipe (OPC), the pressure oil pipe (HP) and the pressurized return oil pipe (DP).

[0021] In an embodiment of the present utility model, there are two groups of intermediate-pressure quick-closure valve oil motors. Both groups of intermediate-pressure quick-closure valve oil motors are connected to the emergency trip oil pipe (AST), the pressure oil pipe (HP) and the pressurized return oil pipe (DP).

[0022] In an embodiment of the present utility model, there are two groups of intermediate-pressure governing valve oil motors. Both groups of intermediate-pressure governing valve oil motors are connected to the overspeed protection oil pipe (OPC), the pressure oil pipe (HP) and the pressurized return oil pipe (DP).

[0023] In an embodiment of the present utility model, the make-up gas quick-closure valve oil motor is connected to the emergency trip oil pipe (AST), the pressure oil pipe (HP) and the pressurized return oil pipe (DP).

[0024] In an embodiment of the present utility model, the make-up gas governing valve oil motor is connected to the overspeed protection oil pipe (OPC), the pressure oil pipe (HP) and the pressurized return oil pipe (DP).

[0025] In a specific embodiment of the present utility model, the oil station 1 provides pressure oil. The high-pressure quick-closure valve oil motor 6, the intermediate-pressure quick-closure valve oil motor 8 and the make-up gas quick-closure valve oil motor 10 respectively control the high-pressure, intermediate-pressure and make-up steam quick-closure valves to achieve the purpose of cutting off the steam inlet for emergency shutdown of the main steam valve. The high-pressure governing valve oil motor 7, the intermediate-pressure governing valve oil motor 9 and the make-up gas governing valve oil motor 11 respectively control the high-pressure, intermediate-pressure and make-up gas governing valves to change the steam flow rate entering the steam turbine to adjust the power of the steam turbine. When the steam turbine fails and needs to be shut down, the emergency protection device 2 acts and drains the emergency trip oil and the overspeed protection oil, closing all the steam turbine valves to shut down the steam turbine. Two sets of high-pressure accumulators and one set of low-pressure accumulators are configured. The high-pressure accumulators provide the required oil volume when a large amount of oil is consumed for the quick action of the oil motors during the emergency shutdown of the system, and the low-pressure accumulators ensure the smooth return oil of the intermediate-pressure module and the make-up gas module.

[0026] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. The hydraulic control system of a double-cylinder and double-speed steam turbine includes an oil station, an emergency protection device, a first high-pressure accumulator, a second high-pressure accumulator and a low-pressure accumulator, and is characterized in that: The oil station is connected with a non-pressure return oil pipe, a pressure return oil pipe and a pressure oil pipe. The emergency protection device is connected with an emergency shutdown oil pipe and an overspeed protection oil pipe. The first high-pressure accumulator and the second high-pressure accumulator are respectively connected with the pressure oil pipe and the non-pressure return oil pipe. The low-pressure accumulator is respectively connected with the non-pressure return oil pipe and the pressure return oil pipe. The emergency protection device is also connected with the pressure oil pipe and the non-pressure return oil pipe; It further includes an actuator. The actuator includes a high-pressure quick-closure valve oil motor, a high-pressure regulating valve oil motor, an intermediate-pressure quick-closure valve oil motor, an intermediate-pressure regulating valve oil motor, a gas supply quick-closure valve oil motor and a gas supply regulating valve oil motor. The actuator is connected with the oil station and the emergency protection device.

2. The hydraulic control system of the double-cylinder and double-speed steam turbine according to claim 1, wherein: There are two groups of high-pressure quick-closure valve oil motors. Both groups of high-pressure quick-closure valve oil motors are connected with the pressure oil pipe, the pressure return oil pipe and the emergency shutdown oil pipe.

3. The hydraulic control system of the double-cylinder and double-speed steam turbine according to claim 2, characterized in that: There are four groups of high-pressure regulating valve oil motors. All four groups of high-pressure regulating valve oil motors are connected with the overspeed protection oil pipe, the pressure oil pipe and the pressure return oil pipe.

4. The hydraulic control system of the double-cylinder and double-speed steam turbine according to claim 3, characterized in that: There are two groups of intermediate-pressure quick-closure valve oil motors. Both groups of intermediate-pressure quick-closure valve oil motors are connected with the emergency shutdown oil pipe, the pressure oil pipe and the pressure return oil pipe.

5. The hydraulic control system of the double-cylinder and double-speed steam turbine according to claim 4, wherein: There are two groups of intermediate-pressure regulating valve oil motors. Both groups of intermediate-pressure regulating valve oil motors are connected with the overspeed protection oil pipe, the pressure oil pipe and the pressure return oil pipe.

6. The hydraulic control system of the double-cylinder and double-speed steam turbine according to claim 5, wherein: The gas supply quick-closure valve oil motor is connected with the emergency shutdown oil pipe, the pressure oil pipe and the pressure return oil pipe.

7. The hydraulic control system of the double-cylinder and double-speed steam turbine according to claim 6, characterized in that: The gas supply regulating valve oil motor is connected with the overspeed protection oil pipe, the pressure oil pipe and the pressure return oil pipe.

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