Split seawater discharge potential energy recovery power generation system

Abstract

This invention provides a separate seawater discharge potential energy recovery and power generation system, including a seawater discharge pipe, a potential energy recovery pipe, a potential energy conversion component, a first valve, and a controller. Both the seawater discharge pipe and the potential energy recovery pipe are connected to an offshore platform. The seawater discharge pipe is arranged horizontally, and the potential energy recovery pipe is arranged vertically below the seawater discharge pipe. A first bypass port with a downward opening is provided on the seawater discharge pipe, located directly above the top opening of the potential energy recovery pipe. The potential energy conversion component is disposed inside the potential energy recovery pipe and is used to convert the potential energy of the seawater into electrical energy. The first valve is located at the first bypass port, and the controller is used to control the opening and closing of the first valve. In this separate seawater discharge potential energy recovery and power generation system, the seawater discharge pipe and the potential energy recovery pipe are separately arranged, and the addition of the potential energy conversion component will not affect the normal seawater discharge operation of the seawater discharge pipe.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, and in particular to a separate seawater discharge potential energy recovery and power generation system. Background Technology

[0002] During the development and production of offshore oil and gas fields, offshore platforms need to introduce large amounts of seawater over a long period as a cooling medium or process water. After cooling or processing, the seawater is usually discharged directly into the sea through a discharge system. This discharge process is often accompanied by certain pressure conditions and vertical height differences, and the potential energy contained in the discharged seawater is not effectively utilized for a long time, resulting in energy waste.

[0003] Currently, some technologies have attempted to recover the potential energy of discharged seawater. For example, existing solutions disclose the use of fixed head conditions to set up hydroelectric power generation devices or the deployment of potential energy recovery equipment based on the overall height difference of the platform. These technical solutions typically couple the discharge pipeline with the potential energy recovery device into an integrated structure. However, the discharge system of offshore platforms prioritizes process safety and continuous discharge. Directly integrating power generation equipment and other recovery devices into the main discharge pipeline can easily interfere with the original discharge function and affect system reliability.

[0004] Therefore, how to efficiently recover the potential energy of discharged seawater without altering the platform's structure and original discharge functions is a technical problem that needs to be solved. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a separate seawater discharge potential energy recovery and power generation system, aiming to solve the problem that the method of directly integrating power generation equipment into the main discharge pipeline to recover seawater potential energy in related technologies interferes with the original seawater discharge function and affects system reliability.

[0006] This invention provides a separate seawater discharge potential energy recovery and power generation system, comprising: A seawater discharge pipe is installed on an offshore platform and extends horizontally. The seawater discharge pipe is provided with at least a seawater inlet, a first discharge outlet and a first bypass outlet, with the opening of the first bypass outlet facing downwards. A potential energy recovery pipe is installed on the offshore platform and extends vertically. The top opening of the potential energy recovery pipe is located directly below the first bypass port and is used to collect seawater discharged through the first bypass port. The bottom of the potential energy recovery pipe extends downward to below the sea level. A potential energy conversion component is installed inside the potential energy recovery pipe and is used to convert the potential energy of seawater into electrical energy. The electrical energy output terminal of the potential energy conversion component is used to connect to electrical equipment or electrical energy storage equipment. The first valve is located at the first bypass port and is used to control the opening and closing of the first bypass port. The controller is electrically connected to the first valve and is used to control the opening and closing of the first valve.

[0007] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, a lifting mechanism is provided between the potential energy recovery pipeline and the offshore platform, and the lifting mechanism is electrically connected to the controller.

[0008] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, at least one second bypass port is also provided on the seawater discharge pipeline. The second bypass port is located upstream of the first bypass port. A bypass pipeline is connected to the second bypass port. A second discharge outlet is provided at the end of the bypass pipeline away from the seawater discharge pipeline. A second valve is provided inside the bypass pipeline. A flow monitoring device is also provided at the upstream end of the seawater discharge pipeline. The second valve and the flow monitoring device are both electrically connected to the controller. When the flow rate detected by the flow monitoring device is greater than a first preset value, the controller controls the second valve to open. When the flow rate detected by the flow monitoring device is less than the second preset value, the controller controls the first valve to close.

[0009] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, both the first valve and the second valve are flow regulating valves.

[0010] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, the top of the potential energy recovery pipe is provided with a conical interface, the inner diameter of the conical interface gradually increases from bottom to top, and the top opening diameter of the conical interface is larger than the diameter of the first bypass port.

[0011] According to the separate seawater discharge potential energy recovery and power generation system provided by the present invention, the lifting mechanism includes: A sliding assembly, wherein the fixed part of the sliding assembly is fixedly connected to the offshore platform, the moving part of the sliding assembly is slidably connected to the fixed part, and the sliding direction is vertical; the potential energy recovery pipe is fixedly connected to the sliding part. A linear drive assembly is disposed between the sliding part and the moving part, and is used to drive the moving part to slide along the fixed part. The linear drive assembly is electrically connected to the controller.

[0012] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, the linear drive component includes a hydraulic cylinder or a screw-nut mechanism driven by a motor, wherein the hydraulic cylinder or the motor is electrically connected to the controller.

[0013] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, the potential energy conversion component is disposed at the bottom inner side of the potential energy recovery pipe.

[0014] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, the potential energy conversion component includes a water turbine and a permanent magnet synchronous generator. The seawater passing through the potential energy recovery pipeline is used to drive the water turbine to rotate, and the water turbine is used to drive the permanent magnet synchronous generator to rotate.

[0015] According to the separate seawater discharge potential energy recovery power generation system provided by the present invention, the seawater discharge pipeline is an existing discharge pipeline on the offshore platform, and a T-joint is provided on the seawater discharge pipeline. Two interfaces of the T-joint are connected to the seawater discharge pipeline, and the other interface of the T-joint forms the first bypass port or the second bypass port.

[0016] The present invention has the following advantages due to the adoption of the above technical solutions: The present invention provides a separate seawater discharge potential energy recovery power generation system, comprising a seawater discharge pipe, a potential energy recovery pipe, a potential energy conversion component, a first valve, and a controller. Both the seawater discharge pipe and the potential energy recovery pipe are connected to an offshore platform. The seawater discharge pipe is arranged horizontally, and the potential energy recovery pipe is arranged vertically, located below the seawater discharge pipe. The seawater discharge pipe has at least a seawater inlet, a first discharge outlet, and a first bypass outlet. The opening of the first bypass outlet faces downwards and is located directly above the top opening of the potential energy recovery pipe, whose bottom extends downwards below sea level. The potential energy conversion component is disposed inside the potential energy recovery pipe and is used to convert the potential energy of the seawater into electrical energy. The generated electrical energy is used to power electrical equipment or stored in an energy storage device. The first valve is located at the first bypass outlet, and the controller controls the opening and closing of the first valve to control the opening and closing of the first bypass outlet. When the controller closes the first valve, seawater, such as cooling water, from the offshore platform enters through the seawater inlet of the seawater discharge pipe and exits through the first discharge outlet, allowing for normal seawater discharge operations. When the controller opens the first valve, seawater from the offshore platform enters through the seawater inlet of the seawater discharge pipe, and is discharged entirely or partially through the first bypass port. It then enters the potential energy recovery pipe, where it is converted into mechanical energy by the potential energy conversion component, and subsequently into electrical energy output. The separate seawater discharge potential energy recovery power generation system provided by this invention separates the seawater discharge pipe from the potential energy recovery pipe, with the potential energy conversion component located within the potential energy recovery pipe, thus not affecting normal seawater discharge operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a separate seawater discharge potential energy recovery and power generation system provided in an embodiment of the present invention.

[0019] Figure label: 100: Seawater discharge pipe; 110: Seawater inlet; 120: First discharge outlet; 130: First bypass outlet; 140: Second bypass outlet; 200: Potential energy recovery pipe; 300: Potential energy conversion component; 400: First valve; 500: Offshore platform; 600: Second valve; 700: Bypass pipe; 800: Lifting mechanism. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] The present invention provides a separate seawater discharge potential energy recovery power generation system, comprising a seawater discharge pipe, a potential energy recovery pipe, a potential energy conversion component, a first valve, and a controller. Both the seawater discharge pipe and the potential energy recovery pipe are connected to an offshore platform. The seawater discharge pipe is arranged horizontally, and the potential energy recovery pipe is arranged vertically, located below the seawater discharge pipe. The seawater discharge pipe has at least a seawater inlet, a first discharge outlet, and a first bypass outlet. The opening of the first bypass outlet faces downwards and is located directly above the top opening of the potential energy recovery pipe, whose bottom extends downwards below sea level. The potential energy conversion component is located inside the potential energy recovery pipe and is used to convert the potential energy of the seawater into electrical energy. The generated electrical energy is used to power electrical equipment or stored in an energy storage device. The first valve is located at the first bypass outlet, and the controller controls the opening and closing of the first valve to control the opening and closing of the first bypass outlet. When the controller closes the first valve, seawater, such as cooling water, from the offshore platform enters through the seawater inlet of the seawater discharge pipe and exits through the first discharge outlet, allowing for normal seawater discharge operations. When the controller opens the first valve, seawater from the offshore platform enters through the seawater inlet of the seawater discharge pipe, and is discharged entirely or partially through the first bypass port. It then enters the potential energy recovery pipe, where it is converted into mechanical energy by the potential energy conversion component, and subsequently into electrical energy output. The separate seawater discharge potential energy recovery power generation system provided by this invention separates the seawater discharge pipe from the potential energy recovery pipe, with the potential energy conversion component located inside the potential energy recovery pipe, thus not affecting normal seawater discharge operations.

[0027] The following is combined Figure 1 The present invention describes a separate seawater discharge potential energy recovery power generation system.

[0028] An embodiment of the present invention provides a separate seawater discharge potential energy recovery power generation system, including a seawater discharge pipe 100, a potential energy recovery pipe 200, a potential energy conversion component 300, a first valve 400, and a controller.

[0029] A seawater discharge pipe 100 is installed on an offshore platform 500 and extends horizontally. One end of the pipe is a seawater inlet 110, and the other end is a first discharge outlet 120. A first bypass outlet 130 is also provided on the side of the seawater discharge pipe 100, with the opening of the first bypass outlet 130 facing downwards. Seawater that has completed cooling or the process can enter through the seawater inlet 110, pass through the seawater discharge pipe 100, and be discharged into the sea through the first discharge outlet 120.

[0030] The potential energy recovery pipe 200 is also installed on the offshore platform 500, but it extends vertically. For example, the potential energy recovery pipe 200 can be installed on the legs of the offshore platform 500 or other fixed structures with a vertical plane. The entire potential energy recovery pipe 200 is located below the seawater discharge pipe 100, and its top opening is located directly below the first bypass port 130 to collect all the seawater discharged through the first bypass port 130. The bottom end of the potential energy recovery pipe 200 extends downward below sea level. The potential energy recovery pipe 200 is used to guide the seawater discharged through the first bypass port 130 into the sea in a vertical direction.

[0031] The potential energy conversion component 300 is installed inside the potential energy recovery pipe 200. When the discharged seawater flows through the potential energy recovery pipe 200, the potential energy conversion component 300 converts the potential energy of the seawater into mechanical energy, and then converts the mechanical energy into electrical energy before outputting it. The generated electrical energy can be directly used by electrical equipment or stored in an electrical energy storage device.

[0032] The first valve 400 is located at the first bypass port 130. The first valve 400 can be opened and closed under the control of the controller, thereby controlling the opening and closing of the first bypass port 130.

[0033] The working principle of the separated seawater discharge potential energy recovery power generation system provided in this embodiment is as follows: The controller opens the first valve 400, causing the first bypass port 130 on the seawater discharge pipe 100 to open. The discharged seawater passes through this first bypass port 130 before reaching the first discharge outlet 120. Therefore, all or part of the seawater is discharged through the first bypass port 130 and falls into the potential energy recovery pipe 200 below. Due to the height difference, when the falling seawater passes through the potential energy conversion component 300 in the potential energy recovery pipe 200, the component converts the seawater's potential energy into mechanical energy, and further converts the mechanical energy into electrical energy. The generated electrical energy is either directly used by electrical equipment or stored in an energy storage device.

[0034] The present invention provides a separate seawater discharge potential energy recovery power generation system, in which the seawater discharge pipe 100 and the potential energy recovery pipe 200 are designed separately, and a potential energy conversion component 300 is installed in the potential energy recovery pipe 200 to realize the separation of seawater discharge and potential energy recovery functions. During use, the addition of the potential energy conversion component 300 will not affect the normal seawater discharge operation. Moreover, when the potential energy conversion component 300 needs maintenance, the first valve 400 can be closed, and the seawater discharge pipe 100 can still operate normally without affecting the continuity of seawater discharge.

[0035] In some embodiments, a lifting mechanism 800 is provided between the potential energy recovery pipeline 200 and the offshore platform 500, and the lifting mechanism 800 is electrically connected to the controller.

[0036] The lifting mechanism 800 is used to adjust the overall height of the potential energy recovery pipe 200 and the potential energy conversion component 300, thereby changing the effective potential energy utilization height of the discharged seawater in the vertical direction. Through this lifting mechanism 800, the system can independently raise and lower without changing the overall height of the platform, adapting to sea level fluctuations and tidal changes without relying on the overall platform lifting and lowering, maintaining a stable potential energy utilization height difference, and improving the utilization efficiency of seawater potential energy in the vertical direction and the adaptability of the platform to operating conditions.

[0037] Furthermore, the lifting mechanism 800 may include a sliding component and a linear drive component.

[0038] The sliding component includes a fixed part and a sliding part. The fixed part can be fixedly connected to a fixed structure such as a pile leg, and the sliding part is slidably connected to the fixed part, with the sliding direction being vertical. The sliding part is connected to the potential energy recovery pipe 200 and is used to drive the potential energy recovery pipe 200 to move vertically, thereby changing its height.

[0039] The linear drive assembly is located between the sliding part and the moving part, or between the sliding part and a fixed structure such as a pile leg. The linear drive assembly is electrically connected to the controller. Under the control of the controller, the linear drive assembly can control the sliding part to slide along the fixed part to change the height of the potential energy recovery pipe 200.

[0040] Specifically, the fixed part of the sliding component can be a slide rail, and the sliding part can be a sliding frame, with the sliding frame and the slide rail slidingly connected.

[0041] The linear drive component can be a hydraulic cylinder. The cylinder body is connected to the slide rail or the pile leg, and the extension rod of the hydraulic cylinder is connected to the sliding frame. The controller controls the extension and retraction of the hydraulic cylinder, which in turn drives the sliding frame to move along the slide rail, ultimately changing the height of the potential energy recovery pipe 200.

[0042] Alternatively, the linear drive assembly can be a screw-nut mechanism driven by a motor. Both ends of the screw are rotatably connected to the slide rail, and one end is connected to the motor drive. The screw extends vertically. The screw is threadedly connected to the sliding frame. When the motor drives the screw to rotate, it drives the sliding frame to move vertically through the threaded engagement, ultimately changing the height of the potential energy recovery pipe 200.

[0043] In some embodiments, the seawater discharge pipe 100 is further provided with at least one second bypass port 140, the second bypass port 140 is located upstream of the first bypass port 130, a bypass pipe 700 is connected to the second bypass port 140, a second discharge outlet is provided at the end of the bypass pipe 700 away from the seawater discharge pipe 100, a second valve 600 is provided inside the bypass pipe 700, and a flow monitoring device is also provided at the upstream end of the seawater discharge pipe 100. Both the second valve 600 and the flow monitoring device are electrically connected to the controller.

[0044] Specifically, the flow monitoring device monitors the flow rate within the seawater discharge pipe 100 in real time and transmits the flow data to the controller. The controller has a first preset value and a second preset value for the flow rate and compares the flow data with these values ​​in real time. When the flow rate exceeds the first preset value, the large flow of seawater may cause impact damage to the potential energy conversion component 300. In this case, the controller will open the second valve 600 to divert some seawater in advance, thereby reducing the flow rate of seawater entering the potential energy recovery pipe 200 and ensuring the safe operation of the potential energy conversion component 300. Alternatively, when the flow rate is lower than the second preset value, it may cause the potential energy conversion component to idle and be damaged. In this case, the controller will close the first valve 400.

[0045] The second valve 600 can be a flow regulating valve. The controller can control the opening of the second valve 600, thereby adjusting the flow rate of the diverted seawater. Under the premise of ensuring the safety of the potential energy conversion component 300, a large flow rate in the potential energy recovery pipeline 200 can be guaranteed to ensure power generation efficiency.

[0046] Meanwhile, the first valve 400 can also be a flow regulating valve. The controller can control the opening of the first valve 400, thereby adjusting the flow rate of seawater entering the potential energy recovery pipe 200.

[0047] In some embodiments, a tapered interface may be provided at the top of the potential energy recovery pipe 200, with the bottom end of the tapered interface being the smaller end and the top end being the larger end, that is, the inner diameter of the tapered interface gradually increases from bottom to top, and the opening diameter at the top of the tapered interface is larger than the diameter of the first bypass port 130. In this way, it can be ensured that all seawater discharged through the first bypass port 130 is guided into the potential energy recovery pipe 200.

[0048] Specifically, the tapered interface can be connected to the top of the potential energy recovery pipe 200 via a flange.

[0049] In some embodiments, the potential energy conversion component 300 is disposed at the bottom inner side of the potential energy recovery pipe 200, thereby ensuring a large height difference between the inlet end of the potential energy recovery pipe 200 and the potential energy conversion component 300, thus improving the utilization rate of potential energy. Furthermore, by arranging the potential energy conversion component 300 at the bottom end of the potential energy recovery pipe 200 in a submerged configuration, the operational stability and service life of the equipment in marine environments are improved.

[0050] Specifically, the potential energy conversion component 300 may include a water turbine and a permanent magnet synchronous generator. When the seawater in the potential energy recovery pipe 200 falls, it drives the water turbine to rotate, that is, the water turbine converts the potential energy of the seawater into mechanical energy. The rotation of the water turbine drives the permanent magnet synchronous generator to rotate, and the permanent magnet synchronous generator converts the mechanical energy into electrical energy.

[0051] In some embodiments, the seawater discharge pipe 100 is an existing discharge pipe of the offshore platform 500, and the seawater discharge pipe 100 of the present invention can be formed simply by modifying the existing discharge pipe.

[0052] Cut off the existing discharge pipe at the location where the first bypass port 130 and the second bypass port 140 are set, and then install a tee connector. Two of the interfaces of the tee connector are connected to the two ports at the cut-off point of the existing discharge pipe, and the other interface forms the first bypass port 130 or the second bypass port 140.

[0053] In one specific embodiment, to verify the feasibility and practicality of the technical solution of the present invention, a separate seawater discharge potential energy recovery and power generation system was deployed on a near-shore oil and gas production platform to achieve efficient recovery and stable power generation of the potential energy of the cooled seawater discharge. The specific implementation is as follows: I. Implementation Scenarios and System Composition 1. Implementation scenario parameters The offshore platform 500 requires a cooling seawater flow rate of 3500~4800 m³ / h for daily operation. After cooling, the seawater is discharged into the sea through the original seawater discharge pipe 100. Before discharge, the pressure is stable at 320~350 kPa. The lower deck of the offshore platform 500 is about 28m above the sea level, and the maximum tidal range can reach 3.2m. It is subject to a complex marine environment with high salt spray and occasional surges.

[0054] 2. Core System Components Seawater discharge pipeline 100: The existing 32-inch carbon steel discharge pipeline of offshore platform 500 will be used, and a DN400 tee will be added 15m from the sea outlet to ensure that the original discharge function is not interfered with. Potential energy recovery pipeline 200: Made of 2205 duplex steel, with a pipe diameter of DN350, an initial design length of 30m, the upper end is connected to a tapered joint via a flange, and the lower end extends to 5m below sea level; Potential energy conversion component 300: integrated at the lower end of potential energy recovery pipe 200, including a 150kW permanent magnet synchronous generator set (protection level IP56) and a mixed-flow turbine, with a rated flow rate of 4000m³ / h, a rated head of 25m, and an efficiency of ≥82%; Lifting structure: It adopts a sliding component driven by a hydraulic cylinder, which is connected to the legs of the 500 offshore platform. The adjustable stroke is 0~5m, the response speed is 0.5m / min, and it can adapt to tidal changes in real time. Interface and support unit: including seismic-resistant pipe support and load transfer base, to transfer the system operating load to the 500 load-bearing structure of the offshore platform, with a maximum load capacity of ≤80t; It is equipped with a flow sensor (range 0~5000m³ / h), pressure transmitter, level gauge and PLC controller.

[0055] II. Implementation Steps 1. System Installation and Deployment Horizontal pipeline modification: Install a first valve 400 at the first bypass port 130 of the tee joint of the existing 32-inch discharge pipeline, and connect the short section of pipeline after the valve to the top of the potential energy recovery pipeline 200; add an additional bypass pipeline 700 to the seawater discharge pipeline 100, located on the upstream side of the first bypass port 130.

[0056] Installation of potential energy recovery pipe 200 and potential energy conversion component 300: The potential energy recovery pipe 200 is vertically laid along one side of the platform pile leg and fixed by the slide rail of the lifting mechanism 800. The potential energy conversion unit is rigidly connected to the inner bottom of the potential energy recovery pipe 200. The whole is sunk to 5m below the sea level and the buoyancy of seawater is used to fix it with the support to reduce the impact of wave surge. Control and power connection: The controller is connected to the platform central control system (CCS). The potential energy conversion component 300 is connected to the platform low voltage distribution board BZ-LOV-002 backup circuit through the grid connection cabinet (150kW / 380V). The grid connection method adopts converter rectification-inverter technology.

[0057] 2. Operation regulation and potential energy recovery Initial commissioning: The effective height of the potential energy recovery pipe 200 is adjusted to 23m by the lifting mechanism 800, so that the seawater falls vertically to form a stable potential energy difference; after the system is started, the controller controls the opening of the first valve 400 to 60%, guiding 2400m³ / h of cooling seawater into the potential energy recovery pipe 200. Dynamic adaptation: Real-time monitoring of tidal data; when the sea level rises by 1.5m, the lifting mechanism 800 automatically descends by 1.5m to maintain a constant effective vertical height; when the seawater flow fluctuates to 3800m³ / h, the controller adjusts the turbine guide vane opening to ensure that the generator set output power remains stable at around 135kW. Energy Conversion: Seawater impacts the turbine impeller under gravity within the potential energy recovery pipe 200, converting potential energy into mechanical energy, which drives the permanent magnet synchronous generator to generate electricity. The electrical energy is filtered by the grid-connected cabinet and then fed into the platform's power system to power auxiliary equipment such as platform lighting and small pump sets.

[0058] 3. Troubleshooting and Maintenance Abnormal operating condition response: When the detected seawater flow rate is lower than 1800 m³ / h or the pressure is lower than 250 kPa, the control unit automatically closes the 200 inlet valve of the potential energy recovery pipeline and opens the bypass pipeline, allowing seawater to be discharged directly into the sea through the original horizontal pipeline to avoid damage from idling; when the surge intensity exceeds 0.8 m, the system triggers the load reduction protection, and the generator set output power is reduced to 50%. Maintenance and support: When the potential energy conversion unit needs to be inspected, the potential energy recovery pipe 200 and the potential energy conversion component 300 are lifted as a whole to 1.2m above sea level using the lifting and adjustment device, and the platform crane is used for hoisting and maintenance. During this period, the original emission system operates normally and there is no downtime impact.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A separate seawater discharge potential energy recovery and power generation system, characterized in that, include: A seawater discharge pipe (100) is installed on an offshore platform (500) and extends horizontally. The seawater discharge pipe (100) is provided with at least a seawater inlet (110), a first discharge outlet (120) and a first bypass outlet (130), with the opening of the first bypass outlet (130) facing downward. A potential energy recovery pipe (200) is installed on the offshore platform (500) and extends vertically. The top opening of the potential energy recovery pipe (200) is located directly below the first bypass port (130) and is used to collect seawater discharged through the first bypass port (130). The bottom of the potential energy recovery pipe (200) extends downward to below the sea level. A potential energy conversion component (300) is disposed inside the potential energy recovery pipe (200) and is used to convert the potential energy of seawater into electrical energy. The electrical energy output terminal of the potential energy conversion component (300) is used to connect to electrical equipment or electrical energy storage equipment. The first valve (400) is located at the first bypass port (130) and is used to control the opening and closing of the first bypass port (130); The controller is electrically connected to the first valve (400) and is used to control the opening and closing of the first valve (400).

2. The separated seawater discharge potential energy recovery power generation system according to claim 1, characterized in that, A lifting mechanism (800) is provided between the potential energy recovery pipeline (200) and the offshore platform (500), and the lifting mechanism (800) is electrically connected to the controller.

3. The separated seawater discharge potential energy recovery power generation system according to claim 1, characterized in that, The seawater discharge pipe (100) is also provided with at least one second bypass port (140), the second bypass port (140) is located upstream of the first bypass port (130), the second bypass port (140) is connected to a bypass pipe (700), the bypass pipe (700) is provided with a second discharge outlet at the end away from the seawater discharge pipe (100), the bypass pipe (700) is provided with a second valve (600), the upstream end of the seawater discharge pipe (100) is also provided with a flow monitoring device, the second valve (600) and the flow monitoring device are both electrically connected to the controller, and when the flow rate detected by the flow monitoring device is greater than the first preset value, the controller controls the second valve (600) to open, and when the flow rate detected by the flow monitoring device is less than the second preset value, the controller controls the first valve (400) to close.

4. The separated seawater discharge potential energy recovery power generation system according to claim 3, characterized in that, Both the first valve (400) and the second valve (600) are flow regulating valves.

5. The separated seawater discharge potential energy recovery power generation system according to claim 1, characterized in that, The top of the potential energy recovery pipe (200) is provided with a tapered interface, the inner diameter of which gradually increases from bottom to top, and the top opening diameter of the tapered interface is larger than the diameter of the first bypass port (130).

6. The separated seawater discharge potential energy recovery power generation system according to claim 2, characterized in that, The lifting mechanism (800) includes: A sliding assembly, wherein the fixed part of the sliding assembly is fixedly connected to the offshore platform (500), the movable part of the sliding assembly is slidably connected to the fixed part, and the sliding direction is vertical; the potential energy recovery pipe (200) is fixedly connected to the sliding part. A linear drive assembly is disposed between the sliding part and the moving part, and is used to drive the moving part to slide along the fixed part. The linear drive assembly is electrically connected to the controller.

7. The separated seawater discharge potential energy recovery power generation system according to claim 6, characterized in that, The linear drive assembly includes a hydraulic cylinder or a lead screw and nut mechanism driven by a motor, wherein the hydraulic cylinder or the motor is electrically connected to the controller.

8. The separated seawater discharge potential energy recovery power generation system according to claim 1, characterized in that, The potential energy conversion component (300) is disposed at the bottom inner side of the potential energy recovery pipe (200).

9. The separated seawater discharge potential energy recovery power generation system according to claim 8, characterized in that, The potential energy conversion component (300) includes a water turbine and a permanent magnet synchronous generator. Seawater passing through the potential energy recovery pipe (200) is used to drive the water turbine to rotate, and the water turbine is used to drive the permanent magnet synchronous generator to rotate.

10. The separated seawater discharge potential energy recovery power generation system according to claim 3, characterized in that, The seawater discharge pipe (100) is an existing discharge pipe on the offshore platform (500). The seawater discharge pipe (100) is equipped with a tee connector. Two ports of the tee connector are connected to the seawater discharge pipe (100), and the other port of the tee connector forms the first bypass port (130) or the second bypass port (140).

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