LNG powered ship fuel supply system transfer line

Abstract

The utility model belongs to ship fuel supply technical field, specifically disclose LNG power ship fuel supply system delivery line, including cold box, gas delivery section, gas input section, GVU valve box, air input pipe, air output pipe, fan and gas engine, gas delivery section is double -walled pipe structure, including inner tube and the outer tube of bushing in the outer side of inner tube, GVU valve box includes valve piece and casing, cold box, inner tube, valve piece, gas input section and gas engine are connected in proper order, constitute gas delivery line, air input pipe, casing, outer tube, fan and air output section constitute air delivery line, and air input pipe is linked together with heat exchange structure. The utility model's gas delivery section uses double -walled pipe all -time, not only can promote the service life of gas pipeline, can also guarantee the stability of gas state in gas pipeline inside, and through heat exchange structure to the air of entering outer tube heat exchange treatment, guarantee the stability of air temperature of entering outer tube, and then guarantee the state of inner tube gas.

Description

Technical Field

[0001] This utility model belongs to the technical field of ship fuel supply systems, specifically relating to the transmission pipeline of LNG-powered ship fuel supply systems. Background Technology

[0002] In recent years, with increasing environmental protection requirements and the advancement of energy transition, LNG-powered inland waterway vessels have gradually gained popularity. However, in their development, the design and construction issues of double-walled pipes have become a significant factor restricting their healthy development.

[0003] Currently, LNG-powered inland waterway vessels are being constructed using double-walled pipe systems without detailed design. This approach overlooks the significant impact of the double-walled pipe system on the gas state within the system.

[0004] First, the structure and material selection of the double-walled pipe directly affect the temperature of the combustion gas inside. Without detailed design, the temperature of the combustion gas inside the pipe may rise or fall abnormally, thus affecting the engine's combustion efficiency and performance. For example, excessively high temperatures may lead to gas leakage risks and abnormal gas engine output, while excessively low temperatures may cause difficulty in starting the engine.

[0005] Secondly, the design of the double-walled pipe is also crucial for the stability of the internal gas pressure. A double-walled pipe that is not designed in detail may not be able to effectively maintain the stability of the internal gas pressure, resulting in insufficient or excessive gas supply, which will affect the ship's power output and economy.

[0006] Furthermore, the design of double-walled pipes is also crucial to the safety and energy efficiency of the fuel supply system. A well-designed double-walled pipe system can effectively reduce the risk of gas leaks, ensuring the safe operation of the ship. At the same time, by optimizing the gas delivery path and insulation measures, it can reduce energy consumption and improve the energy efficiency of the fuel supply system.

[0007] Currently, due to non-standard design and construction of double-walled pipes, LNG-powered ships have encountered numerous problems, such as gas leaks, frequent engine failures, and increased fuel consumption, which seriously affect the normal operation and economic benefits of the ships.

[0008] To address the safety and energy efficiency issues of LNG-powered ships in existing technologies, it is necessary to improve the structure of the fuel supply system pipelines for LNG-powered ships, thereby resolving the current technical problems. Utility Model Content

[0009] The purpose of this invention is to provide a fuel supply system pipeline for LNG-powered ships. The gas transmission section uses double-walled pipes throughout, which not only improves the service life of the gas pipeline but also ensures the stability of the gas state inside the pipeline. Furthermore, the heat exchange structure treats the air entering the outer pipe to ensure the stability of the air temperature entering the outer pipe, thereby ensuring the state of the gas in the inner pipe.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: an LNG-powered ship fuel supply system pipeline, including a cold box, a gas delivery section, a gas input section, a GVU valve box, an air input pipe, an air output pipe, a blower, and a gas engine. The gas delivery section is a double-walled pipe structure, including an inner pipe and an outer pipe sleeved on the outside of the inner pipe, with a gap between the inner pipe and the outer pipe.

[0011] The GVU valve box includes a valve and a housing sleeved on the outside of the valve. The valve has an air inlet and an air outlet, and the housing has an air inlet and an air outlet. One end of the inner tube passes through the air outlet into the housing and is connected to the air inlet of the valve. The other end is connected to the cold box. The connection between the inner tube and the cold box is also inside the outer tube. The two ends of the outer tube are respectively connected to the air outlet and an air output pipe. The air output pipe is equipped with a fan.

[0012] One end of the gas input section passes through the housing and is connected to the gas outlet, while the other end is connected to the gas engine; the air inlet is connected to the air input pipe, and the air input pipe is connected to a heat exchange structure located away from the GVU valve box.

[0013] By adopting the above technical solution, double-walled pipes are used throughout the entire process from the cold box to the gas engine GVU valve box inlet. On the one hand, this can improve the service life of the inner pipe (i.e., the gas pipeline), and on the other hand, it can ensure the stability of the gas state inside the gas pipeline. Furthermore, the heat exchange structure is used to treat the air entering the outer pipe, so that the air temperature entering the outer pipe is stabilized, thereby ensuring the stability of the gas in the inner pipe.

[0014] To better realize this utility model, the outer tube is made of stainless steel.

[0015] By adopting the above technical solutions, stainless steel possesses excellent corrosion resistance, enabling it to withstand the erosion of humid air and various chemicals that the outer pipes of LNG-powered ships will encounter during operation. The inner pipes are typically also made of stainless steel, and using stainless steel for the outer pipes ensures that the expansion coefficients of the inner and outer pipes are consistent, reducing stress caused by differences in thermal expansion and contraction. Stainless steel has high mechanical strength and tensile strength, which is crucial during ship operation when the double-walled pipes are subjected to vibration and dynamic stress. Stainless steel also exhibits good fatigue resistance, ensuring long-term reliable operation of the pipeline. The corrosion resistance and durability of stainless steel result in a long service life and low operating costs.

[0016] To better realize this utility model, the outer wall of the outer tube is wrapped with heat insulation material and stainless steel sheet from the inside to the outside.

[0017] By adopting the above technical solution, flame-retardant insulation materials (including but not limited to rubber and plastic materials) are used to ensure that the outer pipe of the double-walled pipe is isolated from the outside world, and stainless steel sheets are covered on the outermost insulation material for protection, further ensuring the stability of the gas transmission state in the pipeline.

[0018] To better realize this utility model, multiple sets of thermal insulation supports are provided between the inner tube and the outer tube.

[0019] By adopting the above technical solution, heat transfer between the inner and outer pipes is reduced by using insulation materials, the change in the gas state of the inner pipe is reduced, and the temperature difference deformation is reduced, thereby improving the service life of the double-walled pipe.

[0020] To better realize this utility model, each set of thermal insulation supports consists of three support blocks. The three support blocks are arranged at equal intervals along the circumference of the inner tube, and an air channel is provided between any two adjacent support blocks.

[0021] By adopting the above technical solution, stable support between the inner and outer pipes is ensured, while air passage is provided to ensure smooth airflow and further improve the stability of the inner pipe temperature, thereby ensuring the stability of the gas delivery state inside the inner pipe.

[0022] To better realize this utility model, the heat exchange structure includes a circulating water jacket, which is fixedly connected to the inner wall of the air input pipe. The gas engine is provided with an exhaust pipe water jacket, and the circulating water jacket is connected to the exhaust pipe water jacket.

[0023] By adopting the above technical solution, a circulating water jacket is added to the air intake end. The water inside the circulating water jacket is supplied through the exhaust pipe water jacket of the gas engine on the LNG-powered ship. The water temperature in the exhaust pipe water jacket of the gas engine is adjusted by the water temperature control unit inside the ship, so that the air undergoes heat exchange treatment before entering the outer pipe, ensuring the stability of the air temperature entering the outer pipe, thereby ensuring the state of the gas in the inner pipe.

[0024] To better realize this utility model, the circulating water jacket has an annular corrugated structure.

[0025] By adopting the above technical solution, the part of the circulating water jacket that comes into contact with the air adopts an annular corrugated structure, which increases the contact area between water and air, thereby improving the control of the temperature of the air entering the double-walled pipe.

[0026] To better realize this utility model, the outer wall of the air input pipe is wrapped with heat insulation material and stainless steel sheet from the inside to the outside.

[0027] By adopting the above technical solution, the air input pipe and water jacket are insulated and protected, reducing the impact of the external environment on the water temperature, ensuring the stability of the air temperature in the input pipe, and ensuring the stability of the gas transmission status in the pipeline.

[0028] Beneficial effects:

[0029] This invention utilizes a double-walled pipe throughout the entire process from the cold box to the GVU valve box inlet. This extends the service life of the inner pipe (i.e., the gas pipeline) and ensures the stability of the gas state within the pipeline. Furthermore, a heat exchange structure treats the air entering the outer pipe, and by increasing the fan power, the air exchange rate of the double-walled pipe is ensured to be more than 40 times per hour. This increases the heat exchange frequency between the air and the water inside the water jacket, allowing the air to undergo heat exchange before entering the outer pipe. This ensures the stability of the air temperature entering the outer pipe, thereby guaranteeing the state of the gas in the inner pipe. Attached Figure Description

[0030] Figure 1 This is a top view of the present invention;

[0031] Figure 2 This is a cross-sectional view of the present invention.

[0032] Figure 3 This is an enlarged view of point M in this utility model;

[0033] Figure 4 This is a cross-sectional view of the present invention (AA section).

[0034] Figure 5 This is a cross-sectional view of the present invention.

[0035] Figure 6 This is a cross-sectional structural diagram of the fuel conveying section of this utility model;

[0036] Figure 7 This is a structural diagram of the GVU valve box of this utility model.

[0037] In the diagram: 1. Gas transmission section; 101. Inner pipe; 102. Outer pipe; 2. Air input pipe; 3. Fan; 4. Air output pipe; 5. GVU valve box; 501. Valve; 5011. Air inlet; 5012. Air outlet; 502. Shell; 5021. Air inlet; 5022. Air outlet; 6. Cold box; 7. Heat exchange structure; 701. Circulating water jacket; 8. Insulation support; 801. Support block; 802. Air passage; 9. Gas engine; 10. Gas input section. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Example

[0040] like Figures 1-7 As shown, the LNG-powered ship fuel supply system pipeline, to achieve the above objectives, adopts the following technical solution: The LNG-powered ship fuel supply system pipeline includes a cold box 6, a gas delivery section 1, a gas input section 10, a GVU valve box 5, an air input pipe 2, an air output pipe 4, a blower 3, and a gas engine 9. The cold box 6 is a conventional design for LNG-powered ships, installed on the crew deck, and will not be described in detail in this embodiment. The gas delivery section 1 is a double-walled pipe structure. Fluid simulation software is used to calculate and design the pipeline to ensure that the gas in the double-walled fuel supply pipe of the same ship reaches the same state as different gas engines. Furthermore, the fuel supply double-walled pipe is prefabricated and inspected in the land-based shipyard, and finally the prefabricated pipe is welded and inspected on board. Ultimately, this reduces the risk of leakage, facilitates maintenance, and reduces pressure drop. At the same time, reducing the number of bends optimizes the flow field distribution.

[0041] The GVU valve box 5 includes a valve 501 and a housing 502 sleeved on the outside of the valve 501. The GVU valve box 5 is also equivalent to a double-walled pipe structure, which seals the valve 501 through the housing 502. The valve 501 is an essential component for controlling the flow of gas, including but not limited to control valves, pressure gauges, etc., which shall be adapted and used by those skilled in the art. The valve 501 has an inlet end 5011 and an outlet end 5012. The housing 502 has an inlet port 5021 and an outlet port 5022. One end of the inner tube 101 passes through the outlet port 5022 and enters the housing 502, and is connected to the inlet end 5011 of the valve 501. The other end is connected to the cold box 6. The connection between the inner tube 101 and the cold box 6 is also located inside the outer tube 102. The two ends of the outer tube 102 are connected to the outlet port 5022 and the air output pipe 4, respectively. The air output pipe 4 is equipped with a fan 3.

[0042] One end of the gas input section 10 passes through the housing 502 and is connected to the gas outlet 5012, while the other end is connected to the gas engine 9; the air inlet 5021 is connected to the air input pipe 2, and the air input pipe 2 is connected to a heat exchange structure 7 that is far away from the GVU valve box 5.

[0043] The working principle of this utility model can be summarized as follows: Fuel enters the cold box 6 sequentially through the inner pipe 101, the GVU valve box 5 (valve 501), and the gas input section 10, and finally enters the ship's gas engine 9 for combustion and energy release. During the fuel transfer process, air, under the strong suction of the fan 3, first undergoes heat exchange treatment through the heat exchange structure 7, and then sequentially enters the outer pipe 102 through the air input pipe 2 and the GVU valve box 5 (shell 502), where it exchanges heat with the inner pipe 101 and the fuel inside, ensuring stable gas delivery. Finally, it is discharged through the air output pipe 4.

[0044] To save costs, current inland LNG-powered vessel gas transmission pipelines often lack double-walled pipes for deck-mounted pipelines, leaving them exposed. This makes the pipelines susceptible to external temperature fluctuations, leading to instability in the internal gas equipment and shortening the pipeline's lifespan. In contrast, this invention utilizes double-walled pipes throughout the entire process from the cold box 6 to the gas engine GVU valve box 5 inlet. This extends the lifespan of the inner pipe 101 (the gas pipeline) and ensures stable gas conditions within the pipeline. Furthermore, the heat exchange structure 7 treats the air entering the outer pipe 102, stabilizing its temperature and thus ensuring stable gas flow in the inner pipe 101.

[0045] Preferably, the outer pipe 102 is made of stainless steel. For cost savings, the outer pipe 102 of the double-walled pipe for inland LNG-powered vessels uses carbon steel, while the inner pipe 101 is made of stainless steel. For LNG-powered vessels, firstly, they operate on water and frequently travel to coastal areas, coming into contact with seawater, which can cause the carbon steel pipe to corrode. Secondly, carbon steel and stainless steel cannot be used in contact. Although there are supporting components to isolate them, it is difficult to guarantee that the carbon steel pipe inside the double-walled pipe will not rust and detach, thus affecting the safety of the stainless steel inner pipe 101.

[0046] The outer pipe 102 of this invention is also made of stainless steel. Stainless steel has excellent corrosion resistance, which can withstand the erosion of humid air and various chemicals that the outer pipe 102 will come into contact with during the operation of LNG-powered ships. The inner pipe 101 is also usually made of stainless steel. Using stainless steel for the outer pipe 102 ensures that the expansion coefficients of the inner and outer pipes 102 are consistent, reducing stress caused by differences in thermal expansion and contraction. Stainless steel has high mechanical strength and tensile strength. During ship operation, the double-walled pipe will be affected by vibration and dynamic stress. Stainless steel has good fatigue resistance, which can ensure the long-term reliable operation of the pipeline. The corrosion resistance and durability of stainless steel result in a long service life and low operating costs.

[0047] Preferably, the outer wall of the outer pipe 102 is wrapped with heat-insulating material and stainless steel sheet from the inside out. Currently, the double-wall pipes of inland LNG-powered ships are directly exposed to the outside of the deck or the inside of the engine room. Double-wall pipes exposed to the outside of the deck are affected by the external temperature, and double-wall pipes inside the engine room are also affected by the high temperature of the engine room, which will also affect the internal gas pipeline. This utility model uses flame-retardant heat-insulating materials (including but not limited to rubber and plastic materials) to ensure that the outer pipe 102 of the double-wall pipe is isolated from the outside environment, and a stainless steel sheet is covered on the outermost heat-insulating material for protection, further ensuring the stability of the gas transmission state in the pipeline.

[0048] Preferably, multiple sets of thermal insulation supports 8 are provided between the inner pipe 101 and the outer pipe 102. The use of thermal insulation material reduces heat transfer between the inner pipe 101 and the outer pipe 102, reduces changes in the gas state of the inner pipe 101, and reduces temperature difference deformation, thereby improving the service life of the double-walled pipe.

[0049] Preferably, each set of thermal insulation supports 8 consists of three support blocks 801, which are equidistantly arranged along the circumference of the inner pipe 101. An air passage 802 is provided between any two adjacent support blocks 801. This ensures stable support between the inner pipe 101 and the outer pipe 102, while also providing an air passage to ensure smooth airflow and further improve the temperature stability of the inner pipe 101, thereby ensuring the stability of the gas delivery state inside the inner pipe 101.

[0050] Preferably, the heat exchange structure 7 includes a circulating water jacket 701, which is fixedly connected to the inner wall of the air input pipe 2. The gas engine 9 is equipped with an exhaust pipe water jacket, and the circulating water jacket 701 is connected to the exhaust pipe water jacket. The existing double-walled pipe ventilation uses a fan 3 to draw outside air into the outer pipe 102 of the double-walled pipe, maintaining an air exchange rate of 30 times per hour. However, the drawn-in air will also affect the gas state of the inner pipe 101 as the outside temperature changes. This invention adds a circulating water jacket 701 to the air inlet end 5011 of the air input section. The water inside the circulating water jacket 701 is circulated and supplied through the exhaust pipe water jacket of the gas engine 9 on the LNG-powered ship. The water temperature inside the exhaust pipe water jacket of the gas engine 9 is flexibly adjusted by the water temperature control unit inside the ship, increasing the power of the fan 3 to ensure that the air exchange rate of the double-walled pipe is more than 40 times per hour, increasing the heat exchange frequency between the air and the water inside the circulating water jacket 701, so that the air undergoes heat exchange treatment before entering the outer pipe 102, ensuring the stability of the air temperature entering the outer pipe 102, thereby ensuring the state of the gas in the inner pipe 101.

[0051] Preferably, the circulating water jacket 701 has an annular corrugated structure. The part of the circulating water jacket 701 that comes into contact with air adopts an annular corrugated structure, which increases the contact area between water and air, thereby improving the control of the temperature of the air entering the double-walled pipe.

[0052] Preferably, the outer wall of the air inlet pipe 2 is wrapped with heat-insulating material and stainless steel sheets from the inside out. This provides heat insulation and protection for the air inlet pipe 2 and the water jacket, reduces the influence of the external environment on the water temperature, ensures the stability of the air temperature in the inlet pipe 102, and ensures the stability of the gas transmission in the pipeline.

[0053] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An LNG-powered ship fuel supply system pipeline, comprising a cold box (6), a gas delivery section (1), a gas input section (10), a GVU valve box (5), an air input pipe (2), an air output pipe (4), a blower (3), and a gas engine (9), characterized in that, The gas transmission section (1) is a double-walled pipe structure, including an inner pipe (101) and an outer pipe (102) sleeved on the outside of the inner pipe (101), with a gap between the inner pipe (101) and the outer pipe (102); The GVU valve box (5) includes a valve (501) and a housing (502) sleeved on the outside of the valve (501). The valve (501) has an air inlet (5011) and an air outlet (5012). The housing (502) has an air inlet (5021) and an air outlet (5022). One end of the inner tube (101) passes through the air outlet (5022) into the housing (502) and is connected to the air inlet (5011) of the valve (501). The other end is connected to the cold box (6). The connection between the inner tube (101) and the cold box (6) is also located inside the outer tube (102). The two ends of the outer tube (102) are respectively connected to the air outlet (5022) and the air output pipe (4). The air output pipe (4) is equipped with a fan (3). One end of the gas input section (10) passes through the housing (502) and is connected to the gas outlet (5012), and the other end is connected to the gas engine (9); the air inlet (5021) is connected to the air input pipe (2), and the air input pipe (2) is connected to a heat exchange structure (7) that is far away from the GVU valve box (5).

2. The LNG-powered ship fuel supply system pipeline according to claim 1, characterized in that, The outer tube (102) is made of stainless steel.

3. The LNG-powered ship fuel supply system pipeline according to claim 1, characterized in that, The outer wall of the outer tube (102) is wrapped with heat insulation material and stainless steel sheet from the inside to the outside.

4. The LNG-powered ship fuel supply system pipeline according to claim 1, characterized in that, Multiple sets of thermal insulation supports (8) are provided between the inner tube (101) and the outer tube (102).

5. The LNG-powered ship fuel supply system pipeline according to claim 4, characterized in that, Each set of thermal insulation supports (8) consists of three support blocks (801). The three support blocks (801) are arranged at equal intervals along the circumference of the inner tube (101), and an air channel (802) is provided between any two adjacent support blocks (801).

6. The LNG-powered ship fuel supply system pipeline according to claim 1, characterized in that, The heat exchange structure (7) includes a circulating water jacket (701), which is fixedly connected to the inner wall of the air input pipe (2). The gas engine (9) is provided with an exhaust pipe water jacket, and the circulating water jacket (701) is connected to the exhaust pipe water jacket.

7. The LNG-powered ship fuel supply system pipeline according to claim 6, characterized in that, The circulating water jacket (701) has an annular corrugated structure.

8. The LNG-powered ship fuel supply system pipeline according to claim 1, characterized in that, The outer wall of the air input pipe (2) is wrapped with heat insulation material and stainless steel sheet from the inside to the outside.

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