U-shaped non-return device for closed discharge system of offshore platform aero-retrofit unit

Abstract

The utility model discloses a U-shaped non-return device for a closed discharge system of an offshore platform aero-retrofit unit, which comprises a U-shaped liquid seal pipe, a liquid level meter is arranged on the U-shaped liquid seal pipe, butterfly valves are arranged on the upstream and the downstream of the U-shaped liquid seal pipe, and a one-way valve is further arranged on the downstream of the U-shaped liquid seal pipe. The U-shaped liquid seal pipe is respectively connected with the buffer pipe positioned at the upstream and the vertical main pipeline through a three-way pipeline; the buffer pipe is connected with the pressure gauge; an inlet pipeline is arranged at the upstream of the buffer pipe; the vertical main pipeline is provided with a butterfly valve, and the downstream of the vertical main pipeline is connected with an outlet pipeline. The non-return device disclosed by the utility model can be arranged on a converging pipeline of all gas-liquid discharge pipelines of the turbine, so that the aim of preventing slag-containing gas in a closed discharge tank and each discharge pipeline from returning to a turbine fuel pipeline is fulfilled, and the stable operation of the turbine is ensured.

Description

Technical Field

[0001] This utility model relates to the field of turbine generator sets, and in particular to a U-shaped anti-reverse device for a closed-loop emission system of an offshore platform-derived generator set. Background Technology

[0002] Offshore oil platforms utilize modified turbine generator sets with high power and efficiency. However, gas turbines typically use liquid and gaseous fuels, requiring highly precise fuel nozzles. Impurities in the fuel lines can easily clog the nozzles. In emergency situations necessitating fuel-gas switching, clogged nozzles can cause uneven fuel injection, leading to fuel cut-off failure and impacting the stability of the offshore power station.

[0003] Currently, during the switching of offshore aero-derivative turbine units between natural gas and diesel, switching failures have occurred multiple times due to diesel nozzle blockage. Disassembly of the nozzles revealed sediment, and opening the metering valve and the check valve on the BYPASS line showed black impurities in the diesel fuel. For environmental reasons, offshore platforms often connect their oil and gas processes to closed-loop emission systems. These closed-loop tanks are mostly designed with slight positive pressure, and the gas inside often contains a significant amount of sediment. If the gas is not vented in time, the check valve on the emission line may not seal properly due to friction from the sediment, allowing sediment-laden gas to backflow into the fuel system, causing nozzle blockage. Cleaning the system and replacing components each time is costly. Therefore, designing a U-shaped check valve for the closed-loop emission system of offshore aero-derivative turbine units to prevent sediment-laden gas from backflowing to upstream users is of great significance. Utility Model Content

[0004] This invention addresses the problem of slag-containing gas from offshore closed-loop emission systems flowing back to upstream users and clogging fuel nozzles in the fuel lines of modified turbines, leading to unit fuel cut-off failure. It provides a U-shaped anti-reverse device for the closed-loop emission system of offshore platform modified turbines.

[0005] This utility model is achieved by adopting the following technical solution.

[0006] A U-shaped check valve for a closed-loop discharge system of an offshore platform modified unit includes a U-shaped liquid seal pipe equipped with a level gauge. Butterfly valves are installed upstream and downstream of the U-shaped liquid seal pipe, and a one-way valve is installed downstream of the U-shaped liquid seal pipe. The U-shaped liquid seal pipe is connected to an upstream buffer pipe and a vertical main pipeline via a tee line. A pressure gauge is connected to the buffer pipe, and an inlet pipeline is located upstream of the buffer pipe. A butterfly valve is installed in the vertical main pipeline, and an outlet pipeline is connected downstream of the vertical main pipeline.

[0007] Furthermore, the buffer tube is equipped with conversion flanges at both the upper and lower ends.

[0008] Furthermore, the upper conversion flange of the buffer pipe is connected to the inlet pipeline via a tee line; the lower conversion flange of the buffer pipe is connected to the U-shaped liquid seal pipe and the vertical main pipeline via a tee line.

[0009] Furthermore, the downstream end of the one-way valve is connected to the downstream pipe of the one-way valve, and the unused end of the downstream pipe of the one-way valve is connected to the vertical main pipeline and the outlet pipeline through a tee.

[0010] Furthermore, a closed-loop pipe is connected to the lowest end of the U-shaped liquid seal pipe.

[0011] This application has the following beneficial effects.

[0012] This invention is installed between the turbine discharge pipeline and the closed-loop tank, preventing downstream gas from flowing back into the turbine while allowing upstream users to smoothly discharge liquid into the closed-loop tank. This invention effectively solves the problem of turbine fuel nozzle blockage caused by slag-containing gas flowing back into the closed-loop tank and other discharge pipelines, reducing offshore operating pressure and ensuring stable turbine unit operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] The components include: 1. Inlet pipeline; 2. Tee pipeline; 3. Conversion flange; 4. Buffer pipe; 5. Pressure gauge; 6. Butterfly valve; 7. U-shaped liquid seal pipe; 8. Level gauge; 9. Check valve; 10. Closed manifold; 11. Downstream pipe of check valve; 12. Outlet pipeline; 13. Vertical main pipeline. Detailed Implementation

[0015] The present patent application will be further described below with reference to the embodiments.

[0016] like Figure 1 As shown, a U-shaped check valve for a closed-loop discharge system of an offshore platform modified unit includes an inlet pipeline 1, a tee pipeline 2, a conversion flange 3, a buffer pipe 4, a pressure gauge 5, three butterfly valves 6, a U-shaped liquid seal pipe 7, a level gauge 8, a check valve 9, a closed-loop pipe 10, a downstream pipe of the check valve 11, and an outlet pipeline 12.

[0017] Imported pipeline 1 is made of 316L stainless steel and is connected to the exhaust pipeline of the aero-modified unit.

[0018] The upper port of the tee pipe 2 is also connected to the exhaust pipe of the aero-derivative unit, the lower port is connected to the conversion flange 3, and the branch port is connected to the inlet pipe 1. The material is 316L stainless steel.

[0019] The conversion flange 3 is made of 316L stainless steel, enabling the diameter change and connection of the exhaust pipeline and buffer pipe 4 of the aero-derivative unit.

[0020] The buffer pipe 4 volume is set to 8.6 liters, and the function is to buffer and release the exhaust oil and gas of the modified aircraft turbine unit. According to the pipeline calculation, the unit diesel pressure has no effect on the diesel volume. All diesel pipelines in the skid are counted, the 1" pipeline is 2430mm long, the 3 / 4" pipeline is 5300mm long, and the 1 / 2" pipeline is 6700mm long. According to the calculation of V = πr 2 h, it is calculated that the maximum diesel exhaust of the turbine fuel mode shutdown is 4.2 liters each time, and the instantaneous exhaust of the modified aircraft turbine unit is: 2L of diesel and 2dm 3 Natural gas are discharged at the same time. This variable diameter pipe section can store 2 times the exhaust amount to accept the continuous exhaust of the turbine unit.

[0021] The pressure gauge 5 is installed on the wall of the buffer pipe 4, which can detect the pressure of the buffer pipe 4 and the upstream and downstream pipelines in real time, so as to realize the detection of the exhaust pressure. If the downstream connection appears pressure, the flow process needs to be adjusted, and the liquid level of the liquid seal device needs to be adjusted.

[0022] The butterfly valve 6 is provided with three, one is installed on the upstream and downstream of the U-shaped liquid seal pipe 7, and one is installed on the vertical main pipeline 13. The three butterfly valves 6 can realize pipeline conduction and switching, and realize the switching of the normal path and the liquid seal path.

[0023] The U-shaped liquid seal pipe 7 is filled with diesel oil, deionized water and the like to form a liquid seal. The vertical main pipeline butterfly valve is closed, and the upstream and downstream butterfly valves of the U-shaped liquid seal pipe 7 are opened. The gas downstream of the U-shaped reverse stopping device of the closed exhaust system of the modified aircraft turbine unit cannot flow in reverse, and the liquid discharged during the diesel blowing process of the upstream unit can be discharged downward through the liquid gravity, so that the modified aircraft turbine unit and the closed exhaust system are connected, and the gas and impurities cannot be backflowed. The U-shaped liquid seal pipe 7 is the core of the device, and the length is set after calculation, which can store enough length to balance the pressure. The liquid seal device can realize single liquid seal of the downstream pipeline, prevent the backflow of the micro-positive pressure gas and dregs in the downstream from polluting the key part of the upstream turbine unit.

[0024] The liquid level meter 8 adopts a magnetic reed liquid level meter, and the liquid level meter 8 is connected with the U-shaped liquid seal pipe 7 to display the liquid level height of the U-shaped liquid seal pipe 7. The corresponding pressure of the sealing downstream can be adjusted according to the liquid level height.

[0025] The one-way valve 9 is made of 316L stainless steel material, which can seal together with the U-shaped liquid seal pipe 7, and prevent the liquid in the U-shaped liquid seal pipe 7 from being sucked dry by siphon effect and backflowing.

[0026] The closed exhaust pipe 10 is arranged at the lowest point of the U-shaped liquid seal pipe 7, which is used for low-point exhaust and can also be used to supplement the liquid in the U-shaped liquid seal pipe 7 in reverse.

[0027] The downstream pipeline 11 of the one-way valve and the outlet pipeline 12 are connected through a three-way pipe, and are connected to the closed exhaust pipeline of the closed exhaust system of the offshore platform through a pipeline.

[0028] The pipeline and the valve used in the utility model are all made of 316L material, which can relieve the corrosion of the pipeline caused by the medium in the pipeline to the maximum extent.

[0029] The use method of the utility model is as follows:

[0030] The inlet pipeline 1 and the outlet pipeline 12 are respectively connected with the discharge pipeline of the marine modified unit and the closed discharge pipeline (the closed discharge pipeline is connected with the closed discharge tank) of the closed discharge system by using bolts.

[0031] After the connection, the upstream and downstream butterfly valves of the U-shaped liquid seal pipeline 7 are closed, the vertical main pipeline butterfly valve is opened, and the pressure of the pressure gauge 5 is observed; generally, the closed discharge system of the offshore platform has a slight positive pressure of 10-50 Kpa; the liquid height in the U-shaped liquid seal pipeline 7 is adjusted according to the pressure to realize liquid sealing.

[0032] The vertical main pipeline butterfly valve is closed, the upstream and downstream butterfly valves of the U-shaped liquid seal pipeline 7 are opened, the pipeline switching is realized, and the height of the liquid level meter 8 and the buffer pipe pressure display number are observed.

[0033] The one-way valve 9 and the U-shaped liquid seal pipeline 7 jointly ensure that the gas and liquid and the dregs in the closed discharge system cannot be backflowed to the turbine unit.

[0034] The U-shaped check device for the closed discharge system of the marine modified unit of the offshore platform can be directly connected between the closed discharge pipeline of the marine modified unit of the offshore platform and the closed discharge system, and after the connection, the pipeline switching of the main pipeline and the U-shaped liquid seal pipeline 7 is realized, which is convenient and fast. The device is provided with a magnetic reed liquid level meter, the liquid seal height in the liquid seal device can be directly observed, the liquid can be filled and discharged from the lower closed discharge pipeline 10, and the height can be adjusted. The device is directly connected to the system, the pressure gauge 5 is observed after the connection, the liquid surface height in the U-shaped liquid seal pipeline 7 is adjusted according to the pressure, the upstream and downstream butterfly valves of the U-shaped liquid seal pipeline 7 are opened, and the effect of preventing the backflow of the gas and liquid is realized. The check device can be installed on the converging pipeline of all the gas and liquid discharge pipelines of the turbine to avoid the backflow of the dregs-containing gas in the closed discharge tank and the discharge pipelines to the turbine fuel pipeline, and the stable operation of the turbine is ensured.

[0035] The embodiments of the specific embodiment are the preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: all equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A U-type check device for a closed discharge system of a marine platform conversion unit, characterized in that: The U-shaped liquid seal pipe (7) is provided with a liquid level meter (8), butterfly valves (6) are arranged upstream and downstream of the U-shaped liquid seal pipe (7), and a one-way valve (9) is further arranged downstream of the U-shaped liquid seal pipe (7); the U-shaped liquid seal pipe (7) is connected with the upstream buffer pipe (4) and the vertical main pipeline (13) through the three-way pipeline (2); the buffer pipe (4) is connected with a pressure gauge (5), and the upstream of the buffer pipe (4) is provided with an inlet pipeline (1); the vertical main pipeline (13) is provided with a butterfly valve (6), and the downstream of the vertical main pipeline (13) is connected with an outlet pipeline (12).

2. A U-type check device for a closed discharge system of a marine platform conversion unit set according to claim 1, characterized in that: The buffer pipe (4) is provided with a conversion flange (3) at the upper end and the lower end.

3. A U-shaped check device for a closed discharge system of a marine platform conversion unit set according to claim 2, characterized in that: The upper end conversion flange (3) of the buffer pipe (4) is connected with the inlet pipeline (1) through the three-way pipeline (2); and the lower end conversion flange (3) of the buffer pipe (4) is connected with the U-shaped liquid seal pipe (7) and the vertical main pipeline (13) through the three-way pipeline (2).

4. A U-shaped check device for a closed discharge system of a marine platform conversion unit set according to claim 1, characterized in that: The one-way valve (9) is connected with a one-way valve downstream pipe (11) at the downstream, and the free end of the one-way valve downstream pipe (11) is connected with the vertical main pipeline (13) and the outlet pipeline (12) through a three-way pipe.

5. A U-shaped check device for a closed discharge system of a marine platform conversion unit set according to claim 1, characterized in that: A closed discharge pipe (10) is connected to the lowest end of the U-shaped liquid seal pipe (7). The U-shaped liquid seal pipe (7) is provided with a liquid level meter (8), butterfly valves (6) are arranged upstream and downstream of the U-shaped liquid seal pipe (7), and a one-way valve (9) is further arranged downstream of the U-shaped liquid seal pipe (7); the U-shaped liquid seal pipe (7) is connected with the upstream buffer pipe (4) and the vertical main pipeline (13) through the three-way pipeline (2); the buffer pipe (4) is connected with a pressure gauge (5), and the upstream of the buffer pipe (4) is provided with an inlet pipeline (1); the vertical main pipeline (13) is provided with a butterfly valve (6), and the downstream of the vertical main pipeline (13) is connected with an outlet pipeline (12). The buffer pipe (4) is provided with a conversion flange (3) at the upper end and the lower end. The upper end conversion flange (3) of the buffer pipe (4) is connected with the inlet pipeline (1) through the three-way pipeline (2); and the lower end conversion flange (3) of the buffer pipe (4) is connected with the U-shaped liquid seal pipe (7) and the vertical main pipeline (13) through the three-way pipeline (2). The one-way valve (9) is connected with a one-way valve downstream pipe (11) at the downstream, and the free end of the one-way valve downstream pipe (11) is connected with the vertical main pipeline (13) and the outlet pipeline (12) through a three-way pipe. A closed discharge pipe (10) is connected to the lowest end of the U-shaped liquid seal pipe (7).

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