A turbine expander unit working fluid oil supply system

Abstract

The utility model relates to turbine expander technical field, concretely relates to a turbine expander unit working medium oil supply system, and working medium oil supply system mainly includes oil tank main part, supply pump subassembly, treatment device, shunt pipeline and recovery pipe, and supply pump subassembly pumps out oil from oil tank main part, and after cooling filtration by treatment device, divides into brake shunt pipe and lubrication shunt pipe by shunt pipeline, respectively into brake oil hole and lubricating oil hole of turbine expander subassembly, and oil return returns oil tank main part by recovery pipe. Through the integration of lubrication and brake function in common oil tank main part and supply pump subassembly, accurate shunt supply is carried out through brake shunt pipe and lubrication shunt pipe with independent control valve, effectively solve the problem of complex structure, high cost, simultaneously, recovery pipe directly connected between oil tank main part and turbine expander subassembly recovery mouth, establishes working medium oil return path, guarantees that oil liquid after work can be concentrated effectively guided back to oil tank.

Description

Technical Field

[0001] This utility model relates to the field of turbine expander technology, specifically to a working fluid oil supply system for a turbine expander unit. Background Technology

[0002] As a core piece of equipment in industrial processes such as energy recovery and gas liquefaction, the stable and efficient operation of a turboexpander highly depends on a reliable working fluid supply system. This system not only needs to provide sufficient lubrication for the high-speed rotor of the expander to reduce friction and wear, but also needs to supply pressurized oil to the brake section to control the speed and absorb excess power.

[0003] Traditional technical solutions typically employ two independent oil supply systems to meet the lubrication and braking functions respectively. However, two complete oil supply systems result in complex system structures, large footprints, and high initial investment and daily maintenance costs. After use, the lubricating oil and brake fluid are usually directly mixed and flow back by gravity or simple pipelines, making it impossible to form a loop with the two oil supply systems. Utility Model Content

[0004] The purpose of this invention is to provide a working fluid oil supply system for a turbine expander unit, which integrates lubrication and braking functions into a shared oil tank body and supply pump assembly, and simultaneously recovers the working fluid oil for lubrication and braking.

[0005] This application provides a working fluid oil supply system for a turbine expander unit, applied to a turbine expander assembly. The turbine expander assembly is provided with a brake oil port, a lubricating oil port, and a recovery port, including:

[0006] The fuel tank body has a supply pump assembly at its output end, an overflow valve between the supply pump assembly and the fuel tank body, and a recovery pipe connected to the recovery port on the fuel tank body.

[0007] The processing device, wherein the input end of the processing device is connected to the output end of the supply pump assembly via a pipeline, is used for pre-treating the oil.

[0008] The flow divider includes a brake flow divider and a lubrication flow divider. The input end of the flow divider is connected to the output end of the processing device. The brake flow divider and the lubrication flow divider are respectively connected to the brake oil hole and the lubrication oil hole. A control valve is provided on the brake flow divider.

[0009] In some embodiments, the supply pump assembly includes a main supply pump and a standby supply pump, which are connected in parallel at the output end of the tank body.

[0010] In some embodiments, the processing apparatus includes a cooler assembly, including a cooler body, wherein the input end of the cooler body is connected to the output end of the supply pump assembly and the output end is connected to the branch line.

[0011] In some embodiments, the cooler assembly further includes a temperature control valve, wherein the hot end of the temperature control valve and the input end of the cooler body are connected in parallel with the output end of the supply pump assembly, the cold end of the temperature control valve is connected to the output end of the cooler body, and the output end of the temperature control valve is connected to the diversion pipeline.

[0012] In some embodiments, the processing apparatus further includes a filter assembly, the input of which is connected to the output of the cooler body, and the output of which is connected to the branch line.

[0013] In some embodiments, the diversion pipeline includes a main pipeline, the brake diversion pipeline and the lubrication diversion pipeline are connected in parallel on the main pipeline, the end of the main pipeline is provided with a return pipeline communicating with the oil tank body, and a pressure regulating valve is provided between the main pipeline and the return pipeline.

[0014] In some embodiments, an accumulator assembly is also included, the oil port of which is connected to the lubrication manifold.

[0015] In some embodiments, an oil-gas separation component is further included, which is disposed on the main body of the oil tank. The inlet and outlet of the oil-gas separation component are connected to the main body of the oil tank, and the outlet is connected to the outside.

[0016] The beneficial effects of this utility model are as follows: Lubrication and braking functions are integrated into a shared oil tank and supply pump assembly. After processing by a single device, the working fluid is distributed through a diversion pipeline with independent control function, reducing equipment manufacturing costs and floor space. The control valve installed on the brake diversion pipeline enables independent regulation of the brake oil circuit pressure and flow rate, effectively isolating it from impacting the stability of the lubrication circuit. Furthermore, the overflow valve between the supply pump assembly and the oil tank effectively limits the pump's outlet pressure, preventing system overpressure and avoiding energy loss and abnormal heating of the working fluid due to overpressure. Simultaneously, the integration of lubrication and braking functions into a shared oil tank allows for the simultaneous recovery of lubrication and braking working fluids through a recovery pipeline, facilitating subsequent unified oil-gas separation and purification of the returned oil, further reducing equipment manufacturing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pipeline of the working fluid oil supply system of the turbine expander unit in this utility model;

[0018] Figure 2 This is a top view schematic diagram of the working fluid oil supply system of the turbine expander unit in this utility model;

[0019] Figure 3 This is a schematic diagram of the working fluid oil supply system of the turbine expander unit in this utility model.

[0020] Reference numerals: 1. Turbine expander assembly; 11. Brake oil port; 12. Lubricating oil port; 13. Recovery port; 2. Oil tank body; 21. Supply pump assembly; 211. Main supply pump; 212. Backup supply pump; 22. Overflow valve; 23. Recovery pipe; 3. Processing device; 31. Cooler assembly; 311. Cooler body; 312. Temperature control valve; 32. Filter assembly; 321. Pressure regulating valve; 4. Diverter pipe; 41. Brake diverter pipe; 42. Lubrication diverter pipe; 43. Control valve; 44. Accumulator assembly; 5. Oil-gas separator assembly. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] As a core piece of equipment in industrial processes such as energy recovery and gas liquefaction, the stable and efficient operation of a turboexpander highly depends on a reliable working fluid supply system. This system not only needs to provide sufficient lubrication for the high-speed rotor of the expander to reduce friction and wear, but also needs to supply pressurized oil to the braking system to control the speed and absorb excess power. Typically, such systems use an oil pump to pressurize the working fluid in the tank, which then undergoes cooling and filtration before being delivered to the lubrication and braking points. After completing its lubrication and braking functions, the working fluid needs to be effectively collected and returned to the tank for further treatment and recycling.

[0027] Traditional solutions typically employ two independent oil supply systems to separately meet the lubrication and braking functional requirements. However, two complete oil supply systems result in complex system structures, large footprints, and high initial investment and daily maintenance costs. Furthermore, the lubricating and braking oils used are usually directly mixed and flow back via gravity or simple pipelines, failing to form a loop with the two oil supply systems. Therefore, this application provides a working fluid supply system for a turbine expander unit.

[0028] Reference Figures 1 to 3 This application provides a working fluid oil supply system for a turbine expander unit, applied to turbine expander component 1. The turbine expander is a key component necessary for obtaining cooling capacity in air separation equipment, natural gas (petroleum gas) liquefaction separation equipment, and cryogenic pulverizing equipment. Its main principle is to use gas under certain pressure to perform adiabatic expansion in the turbine expander to do work on the outside and consume the internal energy of the gas itself, thereby strongly cooling the gas itself to achieve the purpose of refrigeration. The energy output by the turbine expander is consumed by a coaxial booster compressor, etc.

[0029] The turbine expander assembly 1 is pre-equipped with functional interfaces, namely a brake oil hole 11, a lubricating oil hole 12, and a recovery port 13. The brake oil hole 11 is connected to the braking component of the main shaft in the turbine expander assembly 1, and is used to input brake fluid oil into the braking component to control the speed and absorb residual power. The lubricating oil hole 12 is connected to the bearing component of the main shaft in the turbine expander assembly 1, and provides lubricating fluid oil to the high-speed rotor of the turbine expander assembly 1 to reduce friction and wear. The recovery port 13 is connected to the internal cavity of the main body shell in the turbine expander assembly 1. After the brake fluid oil and the lubricating fluid oil are input, they both enter the internal cavity and are then discharged from the turbine expander assembly 1 through the recovery port 13.

[0030] The working fluid supply system includes an oil tank body 2, a processing device 3, and a distribution pipeline 4. The oil tank body 2 serves as a storage container for the working fluid. In this embodiment, the oil tank body 2 is required to store at least 5 minutes' worth of oil for the oil pump, with a volume of approximately 800 liters. Depending on the application scenario, the volume of the oil tank body 2 can be set to other sizes. It is internally equipped with a heating element to heat the working fluid to a preset temperature. In this embodiment, the oil supply temperature is set at approximately 40°C to prevent the working fluid from being too thin or too thick, which could affect the bearing operation.

[0031] A supply pump assembly 21 is installed at the output end of the oil tank body 2. An overflow valve 22 is installed between the supply pump assembly 21 and the oil tank body 2. A recovery pipe 23 connected to the recovery port 13 is installed on the oil tank body 2. The oil tank body 2 is the starting point of the supply system. The supply pump assembly 21, which pressurizes the working oil in the oil tank, is installed at the output end of the oil tank body 2 to provide initial power for its circulation throughout the system. In this embodiment, the oil supply pressure is greater than 0.5 MPa and the oil supply rate is about 60 liters / minute to ensure normal lubrication and cooling of the bearing.

[0032] Reference Figures 1 to 3 In some embodiments, the supply pump assembly 21 includes a main supply pump 211 and a standby supply pump 212, which are connected in parallel at the output end of the oil tank body 2. To ensure absolute continuity of oil supply, the supply pump assembly 21 can adopt a redundant design, i.e., it includes one main supply pump 211 and one standby supply pump 212, which are connected in parallel at the output end of the oil tank body 2. The supply pump assembly 21 can be a three-screw pump to ensure that the oil supply pressure is between 0.5 and 2.0 MPa and the maximum oil supply rate is not less than 60 liters / minute. The main supply pump 211 undertakes the oil supply task during normal operation, while the standby supply pump 212 is in a hot standby state. The main pump's operating status is monitored by the control system. Once an abnormal pressure or fault is detected in the main pump, it can be automatically started immediately, achieving uninterrupted switching and greatly improving the system's ability to cope with sudden failures.

[0033] An overflow valve 22 is installed between the outlet pipeline of the supply pump assembly 21 and the oil tank. The overflow valve 22 is a pressure protection device used to limit the maximum output pressure of the supply pump. When the pump outlet pressure exceeds the set safety value due to some reason, such as the downstream valve being accidentally closed or the pipeline being blocked, the overflow valve 22 will open quickly and guide part of the high-pressure working oil directly back to the oil tank, thereby preventing the pump from overloading and protecting the subsequent pipelines and components from overpressure impact.

[0034] The input end of the processing device 3 is connected to the output end of the supply pump assembly 21 through a pipeline for pre-treatment of the oil. The pressurized working oil output from the supply pump assembly 21 is transported to the input end of the processing device 3 through a pipeline for heating pre-treatment and purification adjustment of the working oil.

[0035] Reference Figures 1 to 3 In some embodiments, the processing device 3 includes a cooler assembly 31, which includes a cooler body 311. The input end of the cooler body 311 is connected to the output end of the supply pump assembly 21, and the output end is connected to the diversion pipeline 4. The high-temperature working oil enters the cooler body 311 from the input end and carries away the heat absorbed during pumping and power operation by exchanging heat with the cooling medium, thereby reducing the oil temperature to a suitable viscosity range to meet the requirements of lubrication and braking. In this embodiment, the cooling medium can be water. The temperature of the working oil after cooling and output from the cooler assembly 31 is not higher than 50°C, ensuring normal lubrication and cooling of the bearing.

[0036] To achieve more precise control of the working oil temperature, in some embodiments, the cooler assembly 31 further includes a temperature control valve 312. The hot end of the temperature control valve 312 and the input end of the cooler body 311 are connected in parallel with the output end of the supply pump assembly 21; the cold end of the temperature control valve 312 is connected to the output end of the cooler body 311; and the output end of the temperature control valve 312 is connected to the diversion pipeline 4. The temperature control valve 312 is a self-acting regulating valve, with its hot end inlet connected in parallel with the input end of the cooler body 311 to jointly receive hot oil from the supply pump; its cold end... The inlet is connected to the output end of the cooler body 311 after cooling. The temperature sensing element inside the temperature control valve 312 can sense the temperature of the working oil flowing in in real time and automatically adjust the mixing ratio of the hot end working oil and the cold end working oil. For example, when the oil temperature is low at the beginning of system startup, the temperature control valve 312 will preferentially guide the working oil to bypass the cooler body 311 or reduce the cooling flow to make the working oil reach the working temperature quickly. When the oil temperature is too high, it will guide all the working oil to flow through the cooler for sufficient cooling so that the working oil is always at the optimal working viscosity.

[0037] Reference Figures 1 to 3In some embodiments, the processing device 3 further includes a filter assembly 32. The input end of the filter assembly 32 is connected to the output end of the cooler body 311, and the output end of the filter assembly 32 is connected to the diversion pipe 4. In this embodiment, the input end of the filter assembly 32 is connected to the output end of the temperature control valve 312. The working oil after temperature regulation then enters the filter assembly 32 of the processing device 3. The filter assembly 32 is equipped with a replaceable filter element, which can effectively filter out solid contaminants such as metal shavings and dust carried in the working oil, thereby significantly reducing wear and extending the equipment life.

[0038] The diversion line 4 includes a brake diversion line 41 and a lubrication diversion line 42. The input end of the diversion line 4 is connected to the output end of the processing device 3. The brake diversion line 41 and the lubrication diversion line 42 are respectively connected to the brake oil hole 11 and the lubrication oil hole 12. A control valve 43 is provided on the brake diversion line 41. Specifically, the diversion line 4 includes a main line. The brake diversion line 41 and the lubrication diversion line 42 are connected in parallel on the main line. A return pipe connected to the oil tank body 2 is provided at the end of the main line. A pressure regulating valve 321 is provided between the main line and the return pipe.

[0039] The input end of the branch line 4 is first connected to a main line, which serves as the main channel for pressure oil distribution. At the end of the main line, a return pipe leading to the main oil tank 2 is installed. A pressure regulating valve 321 is installed between the two lines to set and maintain the working pressure required for the entire lubrication and braking system. The pressure regulating valve 321 senses the real-time pressure of the main line and automatically adjusts its opening. When the system oil consumption decreases, causing the pressure in the main line to rise, the valve opening increases, leading the excess working oil back to the oil tank through the return pipe. When the oil consumption increases, causing the pressure to fall, the valve closes, reducing the amount of oil returned. Through the dynamic adjustment of the pressure regulating valve 321, the high stability of the main line pressure is effectively improved.

[0040] Two independent functional branches branch off from the main pipeline: a brake shunt pipe 41 and a lubrication shunt pipe 42. The brake shunt pipe 41 supplies oil to the brake oil port 11 of the turbine expander assembly 1 to drive the brake, consuming power, controlling speed, or achieving braking effect. Since braking demand fluctuates frequently with load changes, a control valve 43 is installed on the brake shunt pipe 41. The control valve 43 can be an electro-hydraulic proportional valve or a servo valve; in this embodiment, a pneumatic regulating valve with a handwheel and positioner is used. The control valve 43 receives commands from the unit's control system and can quickly and accurately adjust the flow and pressure of the brake oil circuit, thereby achieving a more sensitive braking response and more precise speed control. In this embodiment, the output end of the brake shunt pipe 41 is equipped with two brake branch pipes, respectively connected to the expansion end brake assembly and the booster end brake assembly of the turbine expander assembly 1. Each brake branch pipe is equipped with a control valve 43 to further improve braking response speed and speed control effect.

[0041] The lubrication diversion pipe 42 is responsible for supplying oil to the lubrication oil hole 12 of the turbine expander assembly 1, providing lubrication for the high-speed rotating bearing. Since the lubrication oil supply requires constant pressure and sufficient flow, unaffected by brake circuit fluctuations, to further enhance lubrication reliability, in this embodiment, the supply system also includes an accumulator assembly 44, whose oil port is connected to the lubrication diversion pipe 42. The accumulator assembly 44 typically separates the oil chamber from the air chamber using a diaphragm or air bladder. When the pipeline pressure increases, it stores some working oil; when the pressure decreases, it releases the stored working oil, supplementing the oil supply and stabilizing the pressure, providing additional protection for the bearing. Simultaneously, when the supply pump assembly 21 suddenly loses power or encounters other faults and cannot continue supplying oil, the working oil stored in the accumulator assembly 44 continues to supply lubricating oil to the main unit for one to two minutes, ensuring the safety of the main unit and further improving the safety and stability of the entire system.

[0042] Reference Figures 1 to 3In some embodiments, the supply system further includes an oil-gas separation component 5, which is disposed on the oil tank body 2. The air inlet and oil return ends of the oil-gas separation component 5 are connected to the oil tank body 2, and the air outlet is connected to the outside. After completing its lubrication and braking functions, the working oil is discharged from the dedicated recovery port 13 on the turbine expander assembly 1. It then returns to the main oil tank 2 via the recovery pipe 23 under gravity or a certain back pressure. Therefore, the oil-gas separation assembly 5 maintains the pressure balance inside the oil tank and ensures that the returned working oil can participate in the next cycle in the best condition. When the working oil mixed with air bubbles returns to the oil tank, the flow rate decreases, and the oil-gas mixture enters the separation assembly. Inside the separation assembly, through mechanical separation methods such as expansion, speed reduction, and change of flow direction, or by using a special filter element, the fine air bubbles are aggregated into large air bubbles and separated from the working oil. The separated clean working oil settles back to the bottom of the oil tank, while the separated gas is guided to the outside of the oil tank through the gas outlet of the oil-gas separation assembly 5, usually connected to the atmosphere or a low-pressure recovery system. This effectively prevents the accumulation of gas in the working oil, avoids problems such as emulsification and deterioration of compressibility of the working oil, ensures the stability of pump suction conditions, and reduces oil deterioration.

[0043] In summary, the working fluid supply system for the turbine expander provided in this application, through the sequential connection of the supply pump assembly 21, the processing device 3, and the diversion pipeline 4 starting from the oil tank output end, and combined with the recovery pipe 23 and the oil-gas separation assembly 5, constitutes a highly efficient and controllable complete working fluid circulation system. It not only realizes the integrated supply and independent and precise control of lubrication and braking functions, but also effectively improves the safety, stability and economy of the turbine expander unit through multi-stage pressure protection and working fluid treatment.

[0044] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A turbine expander unit working medium oil supply system applied to a turbine expander assembly (1), wherein a brake oil hole (11), a lubricating oil hole (12) and a recovery port (13) are arranged on the turbine expander assembly (1), characterized in that, include: The oil tank body (2) is provided with a supply pump assembly (21) at the output end of the oil tank body (2), and an overflow valve (22) is provided between the supply pump assembly (21) and the oil tank body (2). The oil tank body (2) is provided with a recovery pipe (23) that communicates with the recovery port (13). The processing device (3) is connected to the output end of the supply pump assembly (21) via a pipeline for pre-treating the oil. The diversion pipe (4) includes a brake diversion pipe (41) and a lubrication diversion pipe (42). The input end of the diversion pipe (4) is connected to the output end of the processing device (3). The brake diversion pipe (41) and the lubrication diversion pipe (42) are respectively connected to the brake oil hole (11) and the lubrication oil hole (12). A control valve (43) is provided on the brake diversion pipe (41).

2. The supply system of claim 1, wherein The supply pump assembly (21) includes a main supply pump (211) and a standby supply pump (212), which are connected in parallel at the output end of the oil tank body (2).

3. The supply system of claim 1, wherein The processing device (3) includes a cooler assembly (31) and a cooler body (311). The input end of the cooler body (311) is connected to the output end of the supply pump assembly (21), and the output end is connected to the diversion pipeline (4).

4. The supply system of claim 3, wherein The cooler assembly (31) also includes a temperature control valve (312), the hot end of the temperature control valve (312) and the input end of the cooler body (311) are connected in parallel with the output end of the supply pump assembly (21), the cold end of the temperature control valve (312) is connected to the output end of the cooler body (311), and the output end of the temperature control valve (312) is connected to the diversion pipeline (4).

5. The supply system of claim 4, wherein The processing device (3) further includes a filter assembly (32), the input end of which is connected to the output end of the cooler body (311), and the output end of which is connected to the diversion pipe (4).

6. The supply system of claim 1, wherein The diversion pipeline (4) includes a main pipeline, the brake diversion pipeline (41) and the lubrication diversion pipeline (42) are connected in parallel on the main pipeline, and a return pipeline connected to the oil tank body (2) is provided at the end of the main pipeline. A pressure regulating valve (321) is provided between the main pipeline and the return pipeline.

7. The supply system according to claim 1, characterized in that, It also includes an accumulator assembly (44), the oil port of which is connected to the lubrication manifold (42).

8. The supply system of claim 1, wherein It also includes an oil-gas separation component (5), which is installed on the main body of the oil tank (2). The air inlet and oil return ends of the oil-gas separation component (5) are connected to the main body of the oil tank (2), and the air outlet is connected to the outside.

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