Turbine hydraulic control device, carbon dioxide energy storage system and control method thereof

Abstract

The application discloses a turbine hydraulic control device, a carbon dioxide energy storage system and a control method thereof. The turbine hydraulic control device comprises a first oil motor for driving control of a main gas valve and a second oil motor for driving control of an adjusting valve, the first oil motor is connected to an oil tank through a first servo valve, the second oil motor is connected to the oil tank through a second servo valve, a first oil inlet pipeline and a first oil outlet pipeline connected between the first servo valve and the oil tank and a second oil inlet pipeline and a second oil outlet pipeline connected between the second servo valve and the oil tank are respectively provided with throttling holes, the flow of oil inlet and oil outlet is limited through the throttling holes, so that the driving action of the first oil motor and the second oil motor on the main gas valve and the adjusting valve can be carried out gently, in particular, the main gas valve and the adjusting valve can be gently driven to stop, the risk of damage to the valve itself, equipment and pipelines caused by violent impact in the valve closing process is avoided, and long-term stable operation of the system is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a turbine hydraulic control device, a carbon dioxide energy storage system and a control method thereof. BACKGROUND

[0002] It is inevitable to use clean energy such as solar energy and wind energy to slow down the consumption of traditional non-renewable energy such as coal and oil. Due to the intermittent, fluctuating and off-peak power generation characteristics of clean energy, energy storage technology has become one of the key technologies for the development of clean energy. At present, the energy storage technology based on carbon dioxide gas-liquid phase change cycle uses excess power or clean energy to compress and condense gaseous carbon dioxide at normal temperature and pressure in the gas storage unit into liquid carbon dioxide and store it in the liquid storage unit during the low electricity consumption period, and stores the heat generated during the compression process. During the electricity peak period, the stored heat is used to heat the liquid carbon dioxide to a gaseous state, and the gaseous carbon dioxide drives the turbine to drive the generator to generate electricity, and the gaseous carbon dioxide after work returns to the gas storage unit for recycling. The technology has the advantages of simple structure, flexible layout, high energy storage efficiency, etc., and has gradually attracted widespread attention.

[0003] The carbon dioxide energy storage system includes a turbine generator set, a main gas valve and an adjusting valve are arranged on the gas inlet pipeline of the turbine generator set, and the main gas valve and the adjusting valve are respectively driven by corresponding oil motor assemblies. At present, the control mode of the main gas valve and the adjusting valve in the turbine generator set of the carbon dioxide energy storage system is the same as that of the turbine generator set of the traditional thermal power generation system, that is, the main gas valve is opened first and then the adjusting valve is opened when the turbine generator set is started, and the main gas valve is closed first and then the adjusting valve is closed when the turbine generator set is stopped. And in the process of stopping, the main gas valve and the adjusting valve are closed by using the emergency stop mode, that is, by triggering the emergency stop button to quickly discharge the safety oil, the main gas valve and the adjusting valve are quickly closed, so as to cut off the gas inlet and realize stopping, for example, the technical solution disclosed in patent application CN202311231333.0.

[0004] The operation cycle of the turbine generator set of the traditional thermal power generation system is long and the shutdown frequency is low, so the main gas valve and the regulating valve adopt the emergency shutdown closing mode, and the adverse effects on the system can be ignored. Unlike the traditional thermal power generation system, in the carbon dioxide energy storage system, the energy storage process and the energy release process are usually not performed at the same time, and the working principle requires that the energy storage compressor set and the turbine generator set are alternately and frequently started and stopped, usually at least once a day to match the day and night fluctuation of the power grid load. In this case, the main gas valve and the regulating valve of the turbine generator set frequently adopt the emergency shutdown closing mode, which has the following defects: (1) During the rapid closing process of the main gas valve and the regulating valve, the valve rod and the valve body collide violently, and long-term repeated action can cause the valve body components to loosen, accelerate wear, break the gasket and cause leakage between the moving and static clearances, greatly shortening the service life of the valve; (2) The control oil pipeline shakes due to the rapid action of the valve, which can easily cause the pipeline connection to loosen and fall off and cause oil leakage and other safety hazards; (3) The pressure of the turbine inlet pipeline suddenly rises when the valve is closed, which can impact the inlet pipeline and the safety valve, affecting the stability of the system. SUMMARY

[0005] In view of the problems existing in the prior art, the present application provides a turbine hydraulic control device, a carbon dioxide energy storage system and a control method thereof, to solve the problem of how to avoid violent impact during valve closing and reduce damage to the valve itself, equipment and pipeline.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The first aspect of the present application is to provide a turbine hydraulic control device for driving and controlling the main gas valve and the regulating valve of the turbine generator, which comprises:

[0008] An oil tank for storing pressure oil;

[0009] A first oil motor for driving and controlling the opening degree of the main gas valve;

[0010] A second oil motor for driving and controlling the opening degree of the regulating valve;

[0011] A first servo valve connected between the first oil motor and the oil tank for controlling the circulation of pressure oil between the first oil motor and the oil tank;

[0012] A second servo valve connected between the second oil motor and the oil tank for controlling the circulation of pressure oil between the second oil motor and the oil tank;

[0013] The first servo valve and the oil tank are connected with a first oil inlet pipeline and a first oil outlet pipeline, the second servo valve and the oil tank are connected with a second oil inlet pipeline and a second oil outlet pipeline, and throttle holes are arranged on the first oil inlet pipeline, the first oil outlet pipeline, the second oil inlet pipeline and the second oil outlet pipeline.

[0014] In one specific scheme, the first oil motor is provided with a first lower oil cavity and a first upper oil cavity, the second oil motor is provided with a second lower oil cavity and a second upper oil cavity, and the first servo valve and the second servo valve are three-position four-way valves respectively.

[0015] The oil inlet of the first servo valve is connected with the first oil inlet pipeline, the oil outlet of the first servo valve is connected with the first oil outlet pipeline, the first control oil port of the first servo valve is connected to the first lower oil cavity, and the second control oil port of the first servo valve is connected to the first upper oil cavity.

[0016] The oil inlet of the second servo valve is connected with the second oil inlet pipeline, the oil outlet of the second servo valve is connected with the second oil outlet pipeline, the first control oil port of the second servo valve is connected to the second lower oil cavity, and the second control oil port of the first servo valve is connected to the first upper oil cavity.

[0017] In one specific scheme, the first lower oil cavity and the oil tank are connected with a first rapid oil discharge pipeline, and a first electric control valve is arranged on the first rapid oil discharge pipeline; the second lower oil cavity and the oil tank are connected with a second rapid oil discharge pipeline, and a second electric control valve is arranged on the second rapid oil discharge pipeline.

[0018] In one specific scheme, the first oil motor further comprises a first piston rod connected between the first lower oil cavity and the first upper oil cavity, a power output end of the first piston rod extends to the outside of the first end of the first oil motor and is connected with a first valve connecting plate, a first spring is sleeved on the first piston rod between the first valve connecting plate and the first end of the first oil motor, and the first valve connecting plate is used for being connected with the main gas valve.

[0019] The second oil motor further comprises a second piston rod connected between the second lower oil cavity and the second upper oil cavity, a power output end of the second piston rod extends to the outside of the first end of the second oil motor and is connected with a second valve connecting plate, a second spring is sleeved on the second piston rod between the second valve connecting plate and the first end of the second oil motor, and the second valve connecting plate is used for being connected with the regulating valve.

[0020] In one specific implementation, in the moving direction of the first piston rod, a first full-closed feedback device is arranged on the first side of the first valve connecting plate, and a first full-open feedback device is arranged on the second side of the first valve connecting plate; in the moving direction of the second piston rod, a second full-closed feedback device is arranged on the first side of the second valve connecting plate, and a second full-open feedback device is arranged on the second side of the second valve connecting plate.

[0021] In one specific implementation, the second oil discharge pipeline is connected with an oil discharge branch, the oil discharge branch and the throttle hole on the second oil discharge pipeline are arranged in parallel with each other, and the oil discharge branch is provided with a throttle hole and a third electric control valve.

[0022] The second aspect of the present application provides a carbon dioxide energy storage system, comprising a gas storage unit, an energy storage unit, a liquid storage unit and an energy release unit connected in sequence in a closed loop, wherein the energy release unit comprises a turbine generator, and a main gas valve and an adjusting valve are arranged on the gas inlet pipeline of the turbine generator; the carbon dioxide energy storage system further comprises the turbine hydraulic control device as described above, and the turbine hydraulic control device is used for driving control of the main gas valve and the adjusting valve.

[0023] The third aspect of the present application provides a control method of the carbon dioxide energy storage system as described above, and the control method comprises:

[0024] In the starting process of the turbine generator, the turbine hydraulic control device first drives the main gas valve to be fully opened, and then drives the adjusting valve to be opened;

[0025] In the shutdown process of the turbine generator, the turbine hydraulic control device first drives the adjusting valve to be fully closed, and then drives the main gas valve to be fully closed;

[0026] The driving of the adjusting valve to be fully closed comprises: based on the communication control of the second servo valve, the pressure oil in the second oil motor is discharged to the oil tank through the second oil discharge pipeline until the adjusting valve reaches the fully closed state;

[0027] The driving of the main gas valve to be fully closed comprises: based on the communication control of the first servo valve, the pressure oil in the first oil motor is discharged to the oil tank through the first oil discharge pipeline until the main gas valve reaches the fully closed state.

[0028] In one specific scheme, during the start-up process of the turbine generator: first, the oil pressure of the first oil motor is adjusted based on the connection control of the first servo valve, the main air valve is driven to be fully opened by the first oil motor through the first valve connecting plate, at this time the first valve connecting plate triggers the first full opening feedback device to feedback the state signal that the main air valve has been fully opened; then, according to the state signal that the main air valve has been fully opened, the oil pressure of the second oil motor is adjusted based on the connection control of the second servo valve, and the regulating valve is driven to be opened by the second oil motor through the second valve connecting plate.

[0029] During the shutdown process of the turbine generator: first, the oil pressure of the second oil motor is adjusted based on the connection control of the second servo valve, the regulating valve is driven to be fully closed by the second oil motor through the second valve connecting plate, at this time the second valve connecting plate triggers the second full closing feedback device to feedback the state signal that the regulating valve has been fully closed; then, according to the state signal that the regulating valve has been fully closed, the oil pressure of the first oil motor is adjusted based on the connection control of the first servo valve, and the main air valve is driven to be fully closed by the first oil motor through the first valve connecting plate.

[0030] In one specific scheme, when the regulating valve is driven to be closed, the third electrically controlled valve is opened to connect the oil discharge branch, so as to increase the speed of discharging the pressure oil in the second oil motor to the oil tank, thereby shortening the closing time of the regulating valve.

[0031] The turbine hydraulic control device, the carbon dioxide energy storage system and the control method thereof provided by the embodiments of the present application, the turbine hydraulic control device comprises a first oil motor for driving control of a main air valve and a second oil motor for driving control of a regulating valve, the first oil motor is connected to an oil tank through a first servo valve, the second oil motor is connected to the oil tank through a second servo valve, a first oil inlet pipeline and a first oil discharge pipeline connected between the first servo valve and the oil tank and a second oil inlet pipeline and a second oil discharge pipeline connected between the second servo valve and the oil tank are respectively provided with throttle holes, the flow rates of oil inlet and oil discharge are limited through the throttle holes, so that the driving actions of the first oil motor and the second oil motor on the main air valve and the regulating valve can be performed smoothly, in particular, the main air valve and the regulating valve can be smoothly driven to be closed, the risk of damage to the valves themselves, equipment and pipelines caused by violent impact during valve closing process is avoided, and long-term stable operation of the system is ensured.

[0032] Further, in the control method thereof, when the turbine enters the shutdown process, the turbine hydraulic control device first drives the closing regulating valve to the fully closed state, and then drives the closing main gas valve to the fully closed state. In the operation process of the carbon dioxide energy storage system, when the energy release condition ends and reaches the shutdown node, the opening degree of the regulating valve (usually less than 50%) is relatively small at this time, and in the case of driving to close and stop smoothly, the regulating valve can relatively quickly reach the fully closed state, so that the turbine generator can be shut down more quickly by closing the regulating valve first and then closing the main gas valve. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of a carbon dioxide energy storage system in the embodiment of the present application;

[0034] Figure 2 is a structural schematic diagram of a turbine hydraulic control device in the embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the present application clearer, the specific embodiments of the present application will be described in detail below with reference to the drawings. The examples of these preferred embodiments are illustrated in the drawings. The embodiments of the present application shown in the drawings and described according to the drawings are merely exemplary, and the present application is not limited to these embodiments.

[0036] It should be noted that the same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0037] Here, it should also be noted that, in order to avoid obscuring the present application due to unnecessary details, only the structures and / or processing steps closely related to the scheme according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0038] Referring to Figure 1 and Figure 2 , the embodiments of the present application first provide a turbine hydraulic control device 700 and a carbon dioxide energy storage system comprising the turbine hydraulic control device 700.

[0039] As Figure 1As shown, the compressed energy storage system mainly comprises a gas storage unit 100, an energy storage unit 200, a liquid storage unit 300 and an energy release unit 400 connected in sequence. Among them, the gas storage unit 100 is used to store gaseous carbon dioxide at normal pressure, and the liquid storage unit 300 is used to store liquid carbon dioxide. The gaseous carbon dioxide flowing out of the gas storage unit 100 is converted into liquid carbon dioxide at a preset energy storage pressure through the energy storage unit 200, flows into the liquid storage unit 300, and completes the energy storage in the process. The liquid carbon dioxide output from the liquid storage unit 300 is converted into gaseous carbon dioxide at normal pressure through the energy release unit 400 to release energy, and flows into the gas storage unit 100, which completes the release and application of energy in the process. Generally, the gaseous carbon dioxide is compressed and liquefied into liquid carbon dioxide by the energy storage unit 200 during the low electricity consumption period or by using wind and light abandoned electricity, and stored in the liquid storage unit 300, and the energy conversion and compression energy and heat energy are stored; during the electricity consumption peak period, the liquid carbon dioxide is gasified and expanded to do work by the energy release unit 400, and the stored energy is released and converted into electric energy for use.

[0040] As a specific case, in the embodiment, as shown in the figure, Figure 1 The energy storage unit 200 mainly comprises a compressor 201 and an energy storage heat exchanger 202 connected between the gas storage unit 100 and the liquid storage unit 300. Further, a condenser 500 is arranged on the connecting pipeline between the energy storage unit 200 and the liquid storage unit 300. The gaseous carbon dioxide in the gas storage unit 100 is compressed by the compressor 201, then cooled by the energy storage heat exchanger 202, and then liquefied by the condenser 500 to form liquid carbon dioxide stored in the liquid storage unit 300.

[0041] As a specific case, in the embodiment, as shown in the figure, Figure 1 The energy release unit 400 mainly comprises an energy release heat exchanger 401 and a turbine generator 402 connected between the liquid storage unit 300 and the gas storage unit 100. Further, an evaporator 600 is arranged on the connecting pipeline between the liquid storage unit 300 and the energy release unit 400. The liquid carbon dioxide in the liquid storage unit 300 is heated and evaporated by the evaporator 600, then input to the energy release heat exchanger 401 to increase the temperature, then enters the turbine generator 402 to expand and do work to release energy, and finally is converted into gaseous carbon dioxide at normal pressure and stored in the gas storage unit 100.

[0042] Among them, in the energy release unit 400, a main gas valve 404 and an adjusting valve 405 are arranged in sequence on the gas inlet pipeline 403 of the turbine generator 402, the main gas valve 404 is mainly used to control the on-off of the gas inlet pipeline 403, and the adjusting valve 405 is mainly used to control the gas flow input to the turbine generator 402.

[0043] Specifically, as shown in Figure 1 The carbon dioxide energy storage system further comprises the turbine hydraulic control device 700, which is in power connection with the main gas valve 404 and the regulating valve 405, and is used to drive and control the main gas valve 404 and the regulating valve 405. It should be noted that Figure 1 The turbine hydraulic control device 700 shown in the figure only shows the part connected with the main gas valve 404 and the regulating valve 405, and the specific structure of the turbine hydraulic control device 700 can be referred to Figure 2 .

[0044] As shown in Figure 2 In this embodiment, the turbine hydraulic control device 700 mainly comprises an oil tank 1, a first oil motor 2, a second oil motor 3, a first servo valve 4 and a second servo valve 5.

[0045] The oil tank 1 is used to store pressure oil, the first oil motor 2 is used to be connected to the main gas valve 404 to drive and control the opening degree of the main gas valve 404, and the second oil motor 3 is used to be connected to the regulating valve 405 to drive and control the opening degree of the regulating valve 405. The first servo valve 4 is connected between the first oil motor 2 and the oil tank 1, and is used to control the circulation and delivery of pressure oil between the first oil motor 2 and the oil tank 1, so as to adjust the oil pressure of the first oil motor 2, so that the first oil motor 2 can drive to open or close the main gas valve 404. The second servo valve 5 is connected between the second oil motor 3 and the oil tank 1, and is used to control the circulation and delivery of pressure oil between the second oil motor 3 and the oil tank 1, so as to adjust the oil pressure of the second oil motor 3, so that the second oil motor 3 can drive to open or close the regulating valve 405.

[0046] In this embodiment, the first servo valve 4 and the oil tank 1 are connected with a first oil inlet pipeline 4a and a first oil outlet pipeline 4b, the second servo valve 5 and the oil tank 1 are connected with a second oil inlet pipeline 5a and a second oil outlet pipeline 5b, and throttle holes 6 are arranged on the first oil inlet pipeline 4a, the first oil outlet pipeline 4b, the second oil inlet pipeline 5a and the second oil outlet pipeline 5b respectively.

[0047] The turbine hydraulic control device 700 as described above limits the flow of oil inlet and oil outlet through the throttle hole 7, thereby enabling the driving action (opening or closing) of the first oil motor 2 and the second oil motor 3 on the main air valve 404 and the regulating valve 405 to be performed smoothly, in particular, enabling the main air valve 404 and the regulating valve 405 to be driven to be closed smoothly, thereby avoiding the risk of damage to the valve itself, equipment and pipeline caused by violent impact during valve closing, and ensuring long-term stable operation of the system.

[0048] In this embodiment, as shown in Figure 2 The first oil motor 2 further includes a first piston rod 23 connected between the first lower oil cavity 21 and the first upper oil cavity 22, the power output end of the first piston rod 23 extends to the outside of the first end of the first oil motor 2 and is connected with a first valve connecting plate 24, a first spring 25 is sleeved on the first piston rod 23 between the first valve connecting plate 24 and the first end of the first oil motor 2, and the first valve connecting plate 24 is used to be connected with the main air valve 404. Wherein, the piston part of the first piston rod 23 is spaced from the first lower oil cavity 21 and the first upper oil cavity 22, and in this embodiment, the first lower oil cavity 21 is located on the side away from the first valve connecting plate 24, and the first upper oil cavity 22 is located on the side close to the first valve connecting plate 24. Wherein, by adjusting the oil pressure of the first lower oil cavity 21 and the first upper oil cavity 22, a pressure difference is formed between them, and combined with the elastic force of the first spring 25, the first piston rod 23 is driven to move, thereby driving the first valve connecting plate 24 to drive the main air valve 404 to be opened or closed.

[0049] In this embodiment, as shown in Figure 2 The first servo valve 4 is a three-position four-way valve, the oil inlet of the first servo valve 4 is connected with the first oil inlet pipeline 4a, the oil outlet of the first servo valve 4 is connected with the first oil outlet pipeline 4b, the first control oil port of the first servo valve 4 is connected to the first lower oil cavity 21, and the second control oil port of the first servo valve 4 is connected to the first upper oil cavity 22.

[0050] When the main air valve 404 needs to be opened: the first channel 41 of the first servo valve 4 is controlled to move to the middle position, so that the first control oil port of the first servo valve 4 is connected to the oil inlet, and the second control oil port of the first servo valve 4 is connected to the oil outlet. The pressure oil in the oil tank 1 is input to the first lower oil chamber 21 through the first oil inlet pipe 4a, and the pressure oil in the first upper oil chamber 22 is discharged to the oil tank 1 through the first oil outlet pipe 4b. The first piston rod 23 moves toward the first end of the first hydraulic actuator 2, driving the first valve connecting plate 24 to open the main air valve 404.

[0051] When the main air valve 404 needs to be closed: the second channel 42 of the first servo valve 4 is moved to the middle position, so that the second control port of the first servo valve 4 is connected to the inlet port, and the first control port of the first servo valve 4 is connected to the outlet port. The pressurized oil in the oil tank 1 is input to the first upper oil chamber 22 through the first inlet pipe 4a, and the pressurized oil in the first lower oil chamber 21 is discharged to the oil tank 1 through the first outlet pipe 4b. The first piston rod 23 moves away from the first end of the first hydraulic actuator 2, driving the first valve connecting plate 24 to close the main air valve 404. Since throttling orifices 6 are provided on both the first inlet pipe 4a and the first outlet pipe 4b, the flow rate of the inlet and outlet oil is limited, thereby allowing the first hydraulic actuator 2 to smoothly close the main air valve 404.

[0052] In this embodiment, as Figure 2 As shown, the second hydraulic actuator 3 is provided with a second lower oil chamber 31 and a second upper oil chamber 32. The second hydraulic actuator 3 also includes a second piston rod 33 connected between the second lower oil chamber 31 and the second upper oil chamber 32. The power output end of the second piston rod 33 extends to the outside of the first end of the second hydraulic actuator 3 and is connected to a second valve connecting plate 34. A second spring 35 is sleeved on the second piston rod 33 between the second valve connecting plate 34 and the first end of the second hydraulic actuator 3. The second valve connecting plate 34 is used to connect to the regulating valve 405. The piston portion of the second piston rod 33 separates the second lower oil chamber 31 and the second upper oil chamber 32. In this embodiment, the second lower oil chamber 31 is located on the side away from the second valve connecting plate 34, and the second upper oil chamber 32 is located on the side close to the second valve connecting plate 34. Specifically, by adjusting the oil pressure of the second lower oil chamber 31 and the second upper oil chamber 32, a pressure difference is created between them. Combined with the elastic force of the second spring 35, the second piston rod 33 is driven to move, thereby driving the second valve connecting plate 34 to open or close the regulating valve 405.

[0053] In this embodiment, as shown in Figure 2 The second servo valve 5 is a three-position four-way valve, the oil inlet of the second servo valve 5 is connected with the second oil inlet pipeline 5a, the oil outlet of the second servo valve 5 is connected with the second oil outlet pipeline 5b, the first control oil port of the second servo valve 5 is connected to the second lower oil chamber 31, and the second control oil port of the second servo valve 5 is connected to the second upper oil chamber 32.

[0054] When it is needed to open the regulating valve 405, the third channel 51 of the second servo valve 5 is controlled to move to the intermediate position, so that the first control oil port of the second servo valve 5 is communicated with the oil inlet, the second control oil port of the second servo valve 5 is communicated with the oil outlet, the pressure oil in the oil tank 1 is input to the second lower oil chamber 31 through the second oil inlet pipeline 5a, the pressure oil in the second upper oil chamber 32 is discharged to the oil tank 1 through the second oil outlet pipeline 5b, the second piston rod 33 moves towards the first end of the second oil cylinder 3, and drives the second valve connecting plate 34 to open the regulating valve 405.

[0055] When it is needed to close the regulating valve 405, the fourth channel 52 of the second servo valve 5 is controlled to move to the intermediate position, so that the second control oil port of the second servo valve 5 is communicated with the oil inlet, the first control oil port of the second servo valve 5 is communicated with the oil outlet, the pressure oil in the oil tank 1 is input to the second upper oil chamber 32 through the second oil inlet pipeline 5a, the pressure oil in the second lower oil chamber 31 is discharged to the oil tank 1 through the second oil outlet pipeline 5b, the second piston rod 33 moves away from the first end of the second oil cylinder 3, and drives the second valve connecting plate 34 to close the regulating valve 405. Since the throttle hole 6 is arranged on the second oil inlet pipeline 5a and the second oil outlet pipeline 5b, the flow of the oil inlet and the oil outlet is limited, so that the second oil cylinder 3 can gently close the regulating valve 405.

[0056] As a preferred scheme, in this embodiment, as shown in Figure 2As shown, the second oil discharge pipeline 5b is connected with an oil discharge branch 5c, the oil discharge branch 5c and the throttle hole 6 on the second oil discharge pipeline 5b are arranged in parallel with each other, and the oil discharge branch 5c is provided with a throttle hole 6 and a third electric control valve 83. When the adjusting valve 405 is closed, the third electric control valve 83 is opened to make the oil discharge branch 5c communicate. At this time, the pressure oil discharged from the oil discharge port of the second servo valve 5 is simultaneously discharged to the oil tank 1 through the throttle hole 6 on the second oil discharge pipeline 5b and the throttle hole 6 on the oil discharge branch 5c. In this way, the oil discharge speed is appropriately increased to speed up the closing action of the adjusting valve 405, and the situation that the adjusting valve 405 is closed too slowly to cause the generator to generate reverse power is prevented.

[0057] Further, in the embodiment, a first full-closed feedback device 26 is arranged on the first side of the first valve connecting plate 24, and a first full-open feedback device 27 is arranged on the second side of the first valve connecting plate 24, in the moving direction of the first piston rod 23. When the first oil motor 2 drives the opening degree of the main air valve 404 to the full-closed state through the first valve connecting plate 24, the first valve connecting plate 24 triggers the first full-closed feedback device 26, and the first full-closed feedback device 26 feeds back a state signal that the main air valve is fully closed. When the first oil motor 2 drives the opening degree of the main air valve 404 to the full-open state through the first valve connecting plate 24, the first valve connecting plate 24 triggers the first full-open feedback device 27, and the first full-open feedback device 27 feeds back a state signal that the main air valve is fully open.

[0058] Further, in the embodiment, a second full-closed feedback device 36 is arranged on the first side of the second valve connecting plate 34, and a second full-open feedback device 37 is arranged on the second side of the second valve connecting plate 34, in the moving direction of the second piston rod 33. When the second oil motor 3 drives the opening degree of the adjusting valve 405 to the full-closed state through the second valve connecting plate 34, the second valve connecting plate 34 triggers the second full-closed feedback device 36, and the second full-closed feedback device 36 feeds back a state signal that the adjusting valve is fully closed. When the second oil motor 3 drives the opening degree of the adjusting valve 405 to the full-open state through the second valve connecting plate 34, the second valve connecting plate 34 triggers the second full-open feedback device 37, and the second full-open feedback device 37 feeds back a state signal that the adjusting valve is fully open.

[0059] Further, in the embodiment, the first lower oil cavity 21 and the oil tank 1 are connected by a first quick oil drain pipeline 7, and a first electric control valve 81 is arranged on the first quick oil drain pipeline 7a. When the main gas valve 404 needs to be closed urgently, the first electric control valve 81 is opened to make the first quick oil drain pipeline 7a communicate, so that the pressure oil in the first lower oil cavity 21 is quickly drained to the oil tank 1, and the main gas valve 404 is quickly closed. The second lower oil cavity 31 and the oil tank 1 are connected by a second quick oil drain pipeline 7b, and a second electric control valve 82 is arranged on the second quick oil drain pipeline 7b. When the regulating valve 405 needs to be closed urgently, the second electric control valve 82 is opened to make the second quick oil drain pipeline 7b communicate, so that the pressure oil in the second lower oil cavity 31 is quickly drained to the oil tank 1, and the regulating valve 405 is quickly closed.

[0060] Based on the turbine hydraulic control device 700 and the corresponding carbon dioxide energy storage system provided in the above embodiment, the embodiment further provides a control method of the carbon dioxide energy storage system, and the control method of the carbon dioxide energy storage system includes an energy storage stage and an energy release stage. In the energy release stage, during the starting process of the turbine generator 402, the turbine hydraulic control device 700 first drives the main gas valve 404 to be fully opened, and then drives the regulating valve 405 to be opened. During the shutdown process of the turbine generator 402, the turbine hydraulic control device 700 first drives the regulating valve 405 to be fully closed, and then drives the main gas valve 404 to be fully closed.

[0061] In the embodiment, the driving the regulating valve 405 to be fully closed includes: based on the communication control of the second servo valve 5, the pressure oil in the second oil motor 3 is drained to the oil tank 1 through the second oil drain pipeline 5b until the regulating valve 405 reaches the fully closed state. The driving the main gas valve 404 to be fully closed includes: based on the communication control of the first servo valve 4, the pressure oil in the first oil motor 2 is drained to the oil tank 1 through the first oil drain pipeline 4b until the main gas valve 404 reaches the fully closed state.

[0062] During the operation of the carbon dioxide energy storage system, in the energy release stage, when the energy release working condition ends and reaches a shutdown node, the opening degree of the regulating valve 405 (usually less than 50%) is relatively small at this time. Under the condition that the turbine hydraulic control device 700 based on the embodiment of the present application is driven to be gently closed, the regulating valve 405 can relatively faster reach the fully closed state. Therefore, in the process of shutdown, the turbine hydraulic control device 700 first drives the regulating valve 405 to be closed and then drives the main gas valve 404 to be closed, which can cut off the air inlet of the turbine generator 402 and shut down the turbine generator 402 faster.

[0063] Specifically, in the start-up process of the turbine generator 402: first, the oil pressure of the first oil motor 2 is adjusted based on the communication control of the first servo valve 4, the main air valve 404 is driven to open to the full open state by the first oil motor 2 through the first valve connecting plate 24, at this time the first valve connecting plate 24 triggers the first full open feedback device 27 to feedback the state signal that the main air valve has been fully opened; then, according to the state signal that the main air valve has been fully opened, the oil pressure of the second oil motor 3 is adjusted based on the communication control of the second servo valve 5, the regulating valve 405 is driven to open by the second oil motor 3 through the second valve connecting plate 34.

[0064] Specifically, in the shutdown process of the turbine generator 402: first, the oil pressure of the second oil motor 3 is adjusted based on the communication control of the second servo valve 5, the regulating valve 405 is driven to close to the full closed state by the second oil motor 3 through the second valve connecting plate 34, at this time the second valve connecting plate 34 triggers the second full closed feedback device 36 to feedback the state signal that the regulating valve has been fully closed; then, according to the state signal that the regulating valve has been fully closed, the oil pressure of the first oil motor 2 is adjusted based on the communication control of the first servo valve 4, the main air valve 404 is driven to close to the full closed state by the first oil motor 2 through the first valve connecting plate 24.

[0065] As a preferred scheme, in the embodiment, when the regulating valve 405 is driven to close, the third electric control valve 83 is opened to connect the oil discharge branch 5c, the speed of discharging the pressure oil in the second oil motor 3 to the oil tank 1 is increased to shorten the closing time of the regulating valve 405.

[0066] The above is only a specific embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A control method for a carbon dioxide energy storage system, the carbon dioxide energy storage system comprising a gas storage unit, an energy storage unit, a liquid storage unit and an energy release unit connected in series in a closed loop, the energy release unit comprising a turbine generator, a main gas valve and a regulating valve being provided on an intake line of the turbine generator, characterized in that, The carbon dioxide energy storage system further comprises a turbine hydraulic control device for driving control of the main gas valve and the regulating valve; The turbine hydraulic control device comprises: an oil tank for storing pressure oil; a first oil motor for driving control of the opening degree of the main gas valve; a second oil motor for driving control of the opening degree of the regulating valve; a first servo valve connected between the first oil motor and the oil tank for controlling the circulation of pressure oil between the first oil motor and the oil tank; a second servo valve connected between the second oil motor and the oil tank for controlling the circulation of pressure oil between the second oil motor and the oil tank; wherein the first servo valve and the oil tank are connected by a first oil inlet pipeline and a first oil outlet pipeline, and the second servo valve and the oil tank are connected by a second oil inlet pipeline and a second oil outlet pipeline, and a throttling hole is arranged on each of the first oil inlet pipeline, the first oil outlet pipeline, the second oil inlet pipeline and the second oil outlet pipeline; wherein the control method comprises: in the starting process of the turbine generator, the turbine hydraulic control device first drives the opening of the main gas valve to the full open state, and then drives the opening of the regulating valve; in the shutdown process of the turbine generator, the turbine hydraulic control device first drives the closing of the regulating valve to the full closed state, and then drives the closing of the main gas valve to the full closed state; wherein the driving of the closing of the regulating valve to the full closed state comprises: based on the communication control of the second servo valve, the pressure oil in the second oil motor is discharged to the oil tank through the second oil outlet pipeline until the regulating valve reaches the full closed state; wherein the driving of the closing of the main gas valve to the full closed state comprises: based on the communication control of the first servo valve, the pressure oil in the first oil motor is discharged to the oil tank through the first oil outlet pipeline until the main gas valve reaches the full closed state.

2. The control method of the carbon dioxide energy storage system according to claim 1, characterized by, The first oil motor is provided with a first lower oil cavity and a first upper oil cavity, the second oil motor is provided with a second lower oil cavity and a second upper oil cavity, and the first servo valve and the second servo valve are three-position four-way valves respectively; the oil inlet of the first servo valve is connected with the first oil inlet pipeline, the oil outlet of the first servo valve is connected with the first oil outlet pipeline, the first control oil port of the first servo valve is connected to the first lower oil cavity, and the second control oil port of the first servo valve is connected to the first upper oil cavity; the oil inlet of the second servo valve is connected with the second oil inlet pipeline, the oil outlet of the second servo valve is connected with the second oil outlet pipeline, the first control oil port of the second servo valve is connected to the second lower oil cavity, and the second control oil port of the first servo valve is connected to the first upper oil cavity.

3. The control method of the carbon dioxide energy storage system according to claim 2, characterized by, The first lower oil cavity and the oil tank are connected by a first rapid oil discharge pipeline, and a first electric control valve is arranged on the first rapid oil discharge pipeline; the second lower oil cavity and the oil tank are connected by a second rapid oil discharge pipeline, and a second electric control valve is arranged on the second rapid oil discharge pipeline.

4. The control method of the carbon dioxide energy storage system according to claim 2, characterized by, The first oil motor further comprises a first piston rod connected between the first lower oil cavity and the first upper oil cavity, a power output end of the first piston rod extending to outside of the first end of the first oil motor and connected with a first valve connecting plate, a first spring being sleeved on the first piston rod between the first valve connecting plate and the first end of the first oil motor, and the first valve connecting plate being used for being connected with the main air valve; The second oil motor further comprises a second piston rod connected between the second lower oil cavity and the second upper oil cavity, a power output end of the second piston rod extending to outside of the first end of the second oil motor and connected with a second valve connecting plate, a second spring being sleeved on the second piston rod between the second valve connecting plate and the first end of the second oil motor, and the second valve connecting plate being used for being connected with the regulating valve.

5. The control method of the carbon dioxide energy storage system according to claim 4, characterized by, In the moving direction of the first piston rod, a first full-closing feedback device is arranged on the first side of the first valve connecting plate, and a first full-opening feedback device is arranged on the second side of the first valve connecting plate; in the moving direction of the second piston rod, a second full-closing feedback device is arranged on the first side of the second valve connecting plate, and a second full-opening feedback device is arranged on the second side of the second valve connecting plate. In the starting process of the turbine generator: first, the oil pressure of the first oil motor is adjusted based on the communication control of the first servo valve, the main air valve is driven to be opened to a full-opening state by the first oil motor through the first valve connecting plate, at this time, the first valve connecting plate triggers the first full-opening feedback device to feed back a state signal that the main air valve has been fully opened; then, according to the state signal that the main air valve has been fully opened, the oil pressure of the second oil motor is adjusted based on the communication control of the second servo valve, and the regulating valve is driven to be closed by the second oil motor through the second valve connecting plate; In the stopping process of the turbine generator: first, the oil pressure of the second oil motor is adjusted based on the communication control of the second servo valve, the regulating valve is driven to be closed to a full-closing state by the second oil motor through the second valve connecting plate, at this time, the second valve connecting plate triggers the second full-closing feedback device to feed back a state signal that the regulating valve has been fully closed; then, according to the state signal that the regulating valve has been fully closed, the oil pressure of the first oil motor is adjusted based on the communication control of the first servo valve, and the main air valve is driven to be closed to a full-closing state by the first oil motor through the first valve connecting plate.

6. The control method of the carbon dioxide energy storage system according to any one of claims 1 to 5, characterized by, The second oil discharge pipeline is connected with an oil discharge branch, the oil discharge branch and the throttle hole on the second oil discharge pipeline are arranged in parallel with each other, and a throttle hole and a third electric control valve are arranged on the oil discharge branch; When the regulating valve is driven to be closed, the third electric control valve is opened to make the oil discharge branch communicate, so as to increase the speed of discharging the pressure oil in the second oil motor to the oil tank, thereby shortening the closing time of the regulating valve.

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