A marine LNG fuel and diesel dual source supply monitoring and control device

Abstract

The application relates to the technical field of marine fuel supply, in particular to a marine LNG fuel and diesel dual-source supply monitoring and control device, which comprises a fixing base, a conveying pump and a diesel fuel tank fixed at the top end of the fixing base, and a spring pipe arranged around the diesel fuel tank. An LNG fuel tank is mounted on one side of the top end of the fixing base, and a cavity seat is fixedly mounted on the top end of the diesel fuel tank through a support. When low temperature is encountered, waste hot water of the ship can be automatically circulated into the inside of the spring pipe, so that the diesel fuel tank is uniformly heated and insulated as a whole, the stable physical and chemical properties of the fuel are maintained, and when the hot water circulates, the hollow copper bar and the copper stirring rod rotate in the diesel fuel tank. The good heat conductivity of the copper stirring rod can conduct the heat of the hot water to the inside of the fuel. On the other hand, the rotation of the copper stirring rod promotes the formation of convection in the inside of the fuel, accelerates the heat exchange of the fuel in different areas, makes the fuel temperature more uniform, and guarantees stable supply.

Description

Technical Field

[0001] This invention relates to the field of marine fuel supply technology, specifically to a monitoring and control device for dual-source supply of marine LNG fuel and diesel. Background Technology

[0002] Ships are man-made transportation vehicles that primarily operate in geographical waters. Their interiors mainly consist of storage space, supporting structures, and drainage structures. They have propulsion systems that utilize external or internal energy sources. Their energy supply often employs a dual-tank configuration of LNG and diesel fuel to balance power stability and environmental requirements. Marine fuel supply systems are built around the two types of fuel, creating independent yet coordinated storage, transportation, and control systems. Monitoring and control of diesel fuel are particularly critical. Level sensors track the diesel storage tank level in real time, and delivery pumps deliver filtered and controlled-flow diesel to the engine according to instructions. Pressure sensors and automated systems work together to regulate pipeline pressure, ensuring a stable diesel supply.

[0003] However, in special sea areas, the low-temperature environment brings a series of severe challenges to marine fuel supply equipment. Under low-temperature conditions, the physical properties of marine fuel change significantly. Taking the common marine diesel and biodiesel blend as an example, the waxy components contained in diesel will gradually crystallize and precipitate at low temperatures. As the temperature decreases, the wax crystals continue to accumulate and grow, causing the fuel viscosity to increase sharply. This greatly increases the resistance to fuel transportation in pipelines, causing the delivery pump to consume more energy to maintain fuel flow. In severe cases, it may even cause the fuel flow to stop completely, interrupting the fuel supply to the engine and threatening the safety of ship navigation. Summary of the Invention

[0004] The purpose of this invention is to provide a monitoring and control device for dual-source supply of marine LNG fuel and diesel fuel, in order to solve the problem mentioned in the background art that the physical properties of marine fuel change significantly under low temperature conditions. As the temperature decreases, wax crystals continuously aggregate and grow, causing the fuel viscosity to increase sharply, which greatly increases the resistance of fuel transportation in pipelines.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a marine LNG fuel and diesel dual-source supply monitoring and control device, comprising a fixed base, a delivery pump and a diesel fuel tank fixed at the top of the fixed base, and a spring tube wound around and fixed to the outside of the diesel fuel tank. An LNG fuel tank is installed on one side of the top of the fixed base. A cavity seat is fixedly installed at the top of the diesel fuel tank via a bracket. An inlet pipe and an outlet pipe are symmetrically and alternately arranged on both sides of the cavity seat. A monitoring and control component is installed inside one side of the inlet pipe. A hollow copper rod is longitudinally and rotatably sealed inside the cavity seat. The bottom end of the hollow copper rod is rotatably sealed inside one side of the diesel fuel tank. A disc is fixedly installed outside the rotatable end of the top of the hollow copper rod. A pour point depressant injection component and a scale inhibitor injection component are installed at the top of the disc. The monitoring and control component includes a control valve and an alloy memory spring. The control valve is fixedly installed inside one side of the inlet pipe, and the alloy memory spring is placed laterally outside the top side of the inlet pipe near the control valve.

[0006] Furthermore, a delivery pipe is fixedly installed between the input end of the delivery pump and the bottom side of the diesel fuel tank, the output end of the outlet pipe is fixedly connected to the input end of the spring tube, and the output end of the spring tube is fixedly connected to a discharge pipe.

[0007] Furthermore, a limiting block is fixedly installed on the outside of the inlet tube near the top of the alloy memory spring. A limiting groove is embedded inside the top of the limiting block. A slide seat is slidably engaged inside the limiting groove. A rack is slidably installed through one side of the limiting groove.

[0008] Furthermore, one end of the rack is fixedly installed to one end of the slide, a gear is fixedly installed on the top of the valve stem of the control valve, one side of the gear is meshed with one side of the rack, and the two ends of the alloy memory spring are respectively installed on one side of the slide and the inner wall of the limiting slide groove.

[0009] Furthermore, a liquid storage tank 1 and a liquid storage tank 2 are fixedly installed on both sides of the top of the fixed base, and a limiting post is fixedly installed on one edge of the top of the disc. A limiting frame is provided on the outside of the limiting post, and a limiting groove is provided through the inside of the limiting frame. The limiting post and the limiting groove are slidably connected through the groove.

[0010] Furthermore, the pour point depressant injection assembly includes a piston rod and a suction cylinder. The piston rod is laterally slidably mounted on the outside of the top side of the cavity seat via a bracket. The suction cylinder is fixedly mounted on the outside of the cavity seat near the top of the piston rod via a bracket. One end of the piston rod is fixedly mounted at the middle position of the outside of one side of the limiting frame. The piston end of the piston rod is slidably and sealed inside one side of the suction cylinder.

[0011] Furthermore, a one-way inlet valve pipe and a one-way outlet valve pipe are fixedly installed inside the side of the suction cylinder away from the limiting frame. The input end of the one-way inlet valve pipe is fixedly installed inside the bottom side of the storage tank. A sealing rotating sleeve is fixedly installed at the output end of the one-way outlet valve pipe. A mounting base is fixedly installed outside the output end of the one-way outlet valve pipe. One end of the mounting base is fixedly installed outside the bottom side of the cavity seat.

[0012] Furthermore, the sealing rotating sleeve is installed through the rotating seal on one side of the hollow copper rod, and the hollow copper rod has several liquid inlet holes arranged at equal angles around the inside of the side near the sealing rotating sleeve.

[0013] Furthermore, several copper stirring rods are fixedly installed at equal angles on the outside of the hollow copper rod inside the diesel fuel tank. A nozzle pipe is fixedly installed on one side of each of the copper stirring rods, and the input end of the nozzle pipe is fixedly installed inside one side of the hollow copper rod.

[0014] Furthermore, the scale inhibitor injection assembly includes a second piston rod and a second suction cylinder. The second piston rod is laterally slidably mounted on the outer side of the cavity seat away from the top end of the first piston rod via a bracket. The second suction cylinder is fixedly mounted on the outer side of the cavity seat near the top end of the second piston rod via a bracket. One end of the second piston rod is fixedly mounted at the middle position of the outer side of the limiting frame. The piston end of the second piston rod is slidably and sealed inside the side of the first suction cylinder. A second one-way inlet valve pipe and a second one-way outlet valve pipe are fixedly mounted inside the side of the second suction cylinder away from the limiting frame. The input end of the second one-way inlet valve pipe is fixedly mounted inside the bottom end of the second storage tank. The output end of the second one-way outlet valve pipe is fixedly mounted inside the top end of the cavity seat.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] By monitoring and controlling the components and the spring tube, this fuel supply device can monitor and automatically control changes in temperature during use. In low-temperature conditions, it can automatically circulate the ship's waste hot water into the spring tube to ensure uniform heating and insulation of the diesel fuel tank, maintaining the stable physical and chemical properties of the fuel. At the same time, it utilizes the waste heat generated by the ship's operation to achieve secondary energy recovery and utilization, reducing the consumption of fuel or electricity by additional heating equipment, thus saving energy and reducing emissions. During the circulation of hot water, the hollow copper rod and copper stirring rod rotate inside the diesel fuel tank. Through their excellent thermal conductivity, the heat of the hot water can be transferred to the fuel. On the other hand, the rotation of the copper stirring rod promotes convection inside the fuel, accelerating the heat exchange of fuel in different areas, making the fuel temperature more uniform, effectively improving heat transfer efficiency and heating rate. When the device is used in a low-temperature environment, it can automatically detect and trigger, combining external heating and internal heating to achieve rapid overall heating regulation and ensure stable fuel supply.

[0017] By using a disc, limiting column, and limiting frame, the rotation of the hollow copper rod driven by the circulating wastewater will activate the pour point depressant injection component. This allows the pour point depressant from the storage tank to be injected into the fuel in a measured amount. At low temperatures, the depressant adsorbs onto the surface of wax crystals in the fuel, altering their growth habit and preventing them from agglomerating into large crystal particles. This lowers the fuel's pour point and improves its low-temperature fluidity. Simultaneously, the rotation of the hollow copper rod by the wastewater will also trigger the scale inhibitor injection component, injecting scale inhibitor into the wastewater. This prevents scale from depositing and condensing in the surrounding spring tube, which would affect subsequent heat conduction and heating. This effectively cleans the water, extends the lifespan and performance of the spring tube, and ensures stable overall operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a partial cross-sectional perspective view of the three-dimensional structure of the diesel fuel tank and hollow copper rod installation of the present invention;

[0020] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0021] Figure 4 This is a three-dimensional structural diagram of the cavity seat and hollow copper rod installation of the present invention;

[0022] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B;

[0023] Figure 6 For the present invention Figure 4Enlarged structural diagram at point C;

[0024] Figure 7 This is a partial cross-sectional perspective view of the three-dimensional structure of the hollow copper rod and the sealing rotating sleeve of the present invention.

[0025] Figure 8 This is a schematic diagram of the front sectional view of the piston rod and suction cylinder of the present invention.

[0026] Figure 9 This is a top view of the overall structure of the present invention.

[0027] The attached diagram lists the components represented by each number as follows: 1. Fixed base; 2. Delivery pump; 3. Delivery pipe; 4. Diesel fuel tank; 5. Bourdon tube; 6. Cavity seat; 7. Inlet pipe; 8. Outlet pipe; 9. Control valve; 10. Gear; 11. Limit block; 12. Limiting groove; 13. Rack; 14. Slide; 15. Alloy memory spring; 16. Discharge pipe; 17. Liquid storage tank one; 18. Liquid storage tank two; 19. Hollow copper rod; 20. Fan blade; 2 1. Disc; 22. Limiting post; 23. Limiting frame; 24. Limiting groove; 25. Piston rod one; 26. Piston rod two; 27. Suction cylinder one; 28. Suction cylinder two; 29. ​​One-way liquid inlet valve pipe one; 30. One-way liquid outlet valve pipe one; 31. Mounting base; 32. Sealing rotating sleeve; 33. Liquid inlet hole; 34. Copper stirring rod; 35. Nozzle pipe; 36. One-way liquid inlet valve pipe two; 37. One-way liquid outlet valve pipe two; 38. LNG fuel tank. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1: Please refer to Figure 1 - Figure 4A monitoring and control device for dual-source supply of marine LNG fuel and diesel fuel includes a fixed base 1, a delivery pump 2 and a diesel fuel tank 4 fixed to the top of the fixed base 1, and a spring tube 5 wrapped around and fixed to the outside of the diesel fuel tank 4. An LNG fuel tank 38 is installed on one side of the top of the fixed base 1. A cavity seat 6 is fixedly installed on the top of the diesel fuel tank 4 by a bracket. An inlet pipe 7 and an outlet pipe 8 are symmetrically arranged on both sides of the cavity seat 6. A monitoring and control component is installed inside one side of the inlet pipe 7. A hollow copper rod 19 is longitudinally and rotatably sealed inside the cavity seat 6. The bottom end of the hollow copper rod 19 is rotatably sealed and installed inside one side of the diesel fuel tank 4. The monitoring and control component includes a control valve 9 and an alloy memory spring 15. The control valve 9 is fixedly installed inside one side of the inlet pipe 7. The alloy memory spring 15 is placed laterally on the outside of the inlet pipe 7 near the top of the control valve 9.

[0030] A delivery pipe 3 is fixedly installed between the input end of the delivery pump 2 and the bottom side of the diesel fuel tank 4. The output end of the outlet pipe 8 is fixedly connected to the input end of the spring tube 5. The output end of the spring tube 5 is fixedly connected to the discharge pipe 16.

[0031] A limiting block 11 is fixedly installed on the outside of the inlet tube 7 near the top of the alloy memory spring 15. A limiting groove 12 is embedded inside the top of the limiting block 11. A slide seat 14 is installed inside the limiting groove 12. A rack 13 is slidably installed through one side of the limiting groove 12.

[0032] Specifically, the sliding engagement design of the slide block 14 and the limiting slide groove 12 enables the alloy memory spring 15 to move more smoothly and stably when it is deformed, ensuring the overall stability of the monitoring and triggering operation and the overall performance.

[0033] One end of the rack 13 is fixedly installed to one end of the slide 14. A gear 10 is fixedly installed on the top of the valve stem of the control valve 9. One side of the gear 10 meshes with one side of the rack 13. The two ends of the alloy memory spring 15 are respectively installed on one side of the inner wall of the slide 14 and the limiting slide groove 12.

[0034] In this embodiment, when the ship is sailing, the fuel inside the diesel fuel tank 4 is continuously supplied to the engine by starting the delivery pump 2 and opening the delivery pipe 3. When encountering low temperatures, the existing alloy memory spring 15 will contract. When the alloy memory spring 15 contracts, it will pull the side slide 14 and rack 13 to move in the limiting groove 12 inside the limiting block 11. During the movement, the rack 13 drives the meshing gear 10 to rotate. Through the rotation of the gear 10, the valve stem inside the control valve 9 will rotate, thereby opening the control valve 9 and introducing marine waste hot water into the cavity seat 6, outlet pipe 8 and spring tube 5. Through the circulation of waste hot water, the diesel fuel tank 4 is kept evenly heated and kept warm, maintaining the stable physical and chemical properties of the fuel. At the same time, the waste heat generated by the ship's operation is used to realize the secondary recovery and utilization of energy, reducing the consumption of fuel or electricity by additional heating equipment, thus saving energy and reducing emissions.

[0035] It should also be noted that during the circulation of hot water, the impact drives the fan blades 20 inside the cavity seat 6 to rotate, thereby causing the hollow copper rod 19 and the copper stirring rod 34 to rotate inside the diesel fuel tank 4. The good thermal conductivity of the hollow copper rod 19 and the copper stirring rod 34 allows the heat of the hot water to be transferred to the fuel. On the other hand, the rotation of the copper stirring rod 34 promotes convection inside the fuel, accelerating the heat exchange between different areas of the fuel, making the fuel temperature more uniform, and effectively improving the heat transfer efficiency and heating rate. In summary, this device can automatically detect and trigger when used in low-temperature environments, combining external heating and internal heating to achieve overall rapid heating control and ensure stable fuel supply.

[0036] It should also be noted that when the ship sails out of the low-temperature environment, the alloy memory spring 15 begins to reset and extend, thereby driving the limit block 11 and rack 13 to move back, which in turn drives the gear 10 to reset and rotate, so that the control valve 9 is closed. The whole system is automatically monitored and controlled, and the overall performance is good.

[0037] Example 2: Please refer to Figure 5 - Figure 9 This embodiment further illustrates Example 1: A disc 21 is fixedly installed on the outside of the rotating through end of the hollow copper rod 19. The top of the disc 21 is provided with a pour point depressant injection assembly and a scale inhibitor injection assembly.

[0038] Liquid storage tank 17 and liquid storage tank 18 are fixedly installed on both sides of the top of the fixed base 1. A limiting post 22 is fixedly installed on one edge of the top of the disc 21. A limiting frame 23 is provided on the outside of the limiting post 22. A limiting groove 24 is provided through the inside of the limiting frame 23. The limiting post 22 and the limiting groove 24 are connected by a through sliding connection.

[0039] The pour point depressant injection assembly includes a piston rod 25 and a suction cylinder 27. The piston rod 25 is slidably mounted on the outside of the top side of the cavity seat 6 through a bracket. The suction cylinder 27 is fixedly mounted on the outside of the cavity seat 6 near the top of the piston rod 25 through a bracket. One end of the piston rod 25 is fixedly mounted at the middle position of the outside of the limiting frame 23. The piston end of the piston rod 25 is slidably and sealed inside the suction cylinder 27.

[0040] A one-way inlet valve pipe 29 and a one-way outlet valve pipe 30 are fixedly installed inside the side of the suction cylinder 27 away from the limit frame 23. The input end of the one-way inlet valve pipe 29 is fixedly installed inside the bottom side of the storage tank 17. The output end of the one-way outlet valve pipe 30 is connected to and fixedly installed with a sealing rotating sleeve 32. The output end of the one-way outlet valve pipe 30 is fixedly installed with a mounting base 31. One end of the mounting base 31 is fixedly installed outside the bottom side of the cavity seat 6.

[0041] Specifically, when the piston rod 25 draws in, the pour point depressant inside the storage tank 17 is drawn into the suction cylinder 27 through the one-way inlet valve pipe 29. During the drawing process, the pour point depressant can only be drawn in through the one-way inlet valve pipe 29 and cannot be drawn back through the one-way outlet valve pipe 30. At the same time, during the squeezing process, the drawn-in pour point depressant can only be discharged through the one-way outlet valve pipe 30 and cannot flow back into the storage tank 17 through the one-way inlet valve pipe 29, thus forming a one-way transport.

[0042] The sealing rotating sleeve 32 is installed on the outside of one side of the hollow copper rod 19 through the rotating seal. Several liquid inlet holes 33 are arranged in a uniform angle around the inside of the hollow copper rod 19 near the sealing rotating sleeve 32.

[0043] Specifically, through the through-rotation sealing installation of the sealing rotating sleeve 32 and the hollow copper rod 19, and the setting of several liquid inlet holes 33 on the outside of the hollow copper rod 19, the one-way drain valve pipe 30 can also inject the pouring depressant into the interior of the hollow copper rod 19 through several liquid inlet holes 33 when the hollow copper rod 19 is rotating, thereby ensuring the overall operational stability and overall performance.

[0044] A hollow copper rod 19 is located inside the diesel fuel tank 4 and is fixedly installed with several copper stirring rods 34 at equal angles on the outside. Each of the copper stirring rods 34 has a nozzle pipe 35 fixedly installed on one side of its exterior. The input end of the nozzle pipe 35 is fixedly installed inside one side of the hollow copper rod 19.

[0045] The scale inhibitor injection assembly includes a piston rod 26 and a suction cylinder 28. The piston rod 26 is slidably mounted laterally through a bracket on the outer side of the cavity seat 6 away from the top end of the piston rod 25. The suction cylinder 28 is fixedly mounted on the outer side of the cavity seat 6 near the top end of the piston rod 26 through a bracket. One end of the piston rod 26 is fixedly mounted at the middle position of the outer side of the limiting frame 23. The piston end of the piston rod 26 is slidably sealed inside the suction cylinder 27. A one-way inlet valve pipe 26 and a one-way outlet valve pipe 27 are fixedly mounted through the inner side of the suction cylinder 28 away from the limiting frame 23. The input end of the one-way inlet valve pipe 26 is fixedly mounted through the inner side of the bottom end of the storage tank 18. The output end of the one-way outlet valve pipe 27 is fixedly mounted inside the inner side of the top end of the cavity seat 6.

[0046] Specifically, when piston rod 26 draws in, the pour point depressant inside storage tank 18 is drawn into suction cylinder 28 through one-way inlet valve pipe 36. During suction, the scale inhibitor can only be drawn in through one-way inlet valve pipe 36 and cannot be drawn back through one-way outlet valve pipe 37. At the same time, during extrusion, the drawn-in scale inhibitor can only be discharged through one-way outlet valve pipe 37 and cannot flow back into storage tank 18 through one-way inlet valve pipe 36, forming a one-way transport and ensuring stable overall operation.

[0047] In this embodiment, when hot water circulates, it impacts and drives the fan blades 20 inside the cavity seat 6 to rotate, thereby causing the hollow copper rod 19 and the copper stirring rod 34 to rotate inside the diesel fuel tank 4. The rotation of the hollow copper rod 19 drives the outer fixed disc 21 at the top to rotate synchronously, and the rotation of the disc 21 drives the limiting post 22 to rotate synchronously. The limiting post 22 slides and engages with the limiting groove 24 inside the limiting frame 23, so that when the limiting post 22 rotates, it drives the piston rod 25 on one side to reciprocate inside the suction cylinder 27. At the same time, it cooperates with the one-way liquid inlet valve pipe 29 and the liquid storage tank 1 The connection between pipe 17 and the one-way drain valve pipe 30 and the hollow copper rod 19 allows the piston rod 25 to reciprocate inside the suction cylinder 27, thereby drawing and squeezing the pre-stored pour point depressant inside the storage tank 17 into the hollow copper rod 19. Then, through several nozzle pipes 35 connected to the outside of the hollow copper rod 19, the measured amount of pour point depressant is evenly mixed and discharged into the fuel inside the diesel fuel tank 4. This allows it to be adsorbed on the surface of wax crystals in the fuel at low temperatures, changing the growth habit of wax crystals, preventing wax crystals from agglomerating to form large crystalline particles, thereby reducing the pour point of the fuel, improving its low-temperature fluidity, and ensuring the overall performance.

[0048] It should also be noted that when the limiting column 22 rotates, it drives the piston rod 25 on one side to reciprocate inside the suction cylinder 27, which in turn drives the piston rod 26 on the other side of the limiting frame 23 to reciprocate inside the suction cylinder 28. At the same time, with the connection between the one-way inlet valve pipe 36 and the storage tank 18, and the one-way outlet valve pipe 37 and the inside of the top of the cavity seat 6, the piston rod 26 reciprocates inside the suction cylinder 28, which draws and squeezes the scale inhibitor stored in the storage tank 18 into the cavity seat 6 in a measured amount. This mixes with the waste hot water passing through the cavity seat 6, thereby preventing scale from depositing and condensing in the surrounding spring tube 5, which would affect the subsequent heat conduction and heating effect, effectively cleaning the water quality, extending the service life and performance of the spring tube 5, and ensuring overall stable operation.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A monitoring and control device for dual-source supply of marine LNG fuel and diesel fuel, comprising a fixed base (1), a delivery pump (2) fixed to the top of the fixed base (1), a diesel fuel tank (4), and a spring tube (5) wrapped around and fixed to the outside of the diesel fuel tank (4), characterized in that: An LNG fuel tank (38) is installed on one side of the top of the fixed seat (1). A cavity seat (6) is fixedly installed on the top of the diesel fuel tank (4) by a bracket. An inlet pipe (7) and an outlet pipe (8) are symmetrically and alternately arranged on both sides of the cavity seat (6). A monitoring and control component is installed inside one side of the inlet pipe (7). A hollow copper rod (19) is installed in the cavity seat (6) with a longitudinal through-rotation seal. The bottom end of the hollow copper rod (19) is installed in the diesel fuel tank (4) with a through-rotation seal. A disc (21) is fixedly installed on the outside of the rotating through end of the top of the hollow copper rod (19). A pour point depressant injection component and a scale inhibitor injection component are arranged on the top of the disc (21). The monitoring and control assembly includes a control valve (9) and an alloy memory spring (15). The control valve (9) is fixedly installed inside one side of the inlet tube (7), and the alloy memory spring (15) is placed horizontally on the outside of the inlet tube (7) near the top of the control valve (9). A limiting post (22) is fixedly installed on one side edge of the top of the disc (21), and a limiting frame (23) is provided on the outside of the limiting post (22); The pour point depressant injection assembly includes a piston rod (25) and a suction cylinder (27). The piston rod (25) is slidably mounted on the outside of the top side of the cavity seat (6) through a bracket. The suction cylinder (27) is fixedly mounted on the outside of the cavity seat (6) near the top of the piston rod (25) through a bracket. One end of the piston rod (25) is fixedly mounted at the middle position of the outside of the limiting frame (23). The piston end of the piston rod (25) is slidably and sealed inside the side of the suction cylinder (27). The hollow copper rod (19) is located inside the diesel fuel tank (4) and is fixedly installed with several copper stirring rods (34) at equal angles on the outside. The input end of the delivery pump (2) is connected to the bottom end of the diesel fuel tank (4) and a delivery pipe (3) is fixedly installed. The output end of the outlet pipe (8) is connected to the input end of the spring tube (5) and a discharge pipe (16) is connected to the output end of the spring tube (5). The inlet pipe (7) is fixedly installed with a limit block (11) on the outside near the top end of the alloy memory spring (15). The top of the control valve (9) is internally embedded with a limiting groove (12), and a slide block (14) is installed inside the limiting groove (12). A rack (13) is slidably installed through one side of the limiting groove (12). One end of the rack (13) is fixedly installed with one end of the slide block (14). A gear (10) is fixedly installed at the top of the valve stem of the control valve (9). One side of the gear (10) is meshed with one side of the rack (13). The two ends of the alloy memory spring (15) are respectively installed on one side of the inner wall of the slide block (14) and the limiting groove (12). The limiting frame (23) is provided with a limiting groove (24) through it, and the limiting post (22) and the limiting groove (24) are slidably connected through it; One-way inlet valve pipe (29) and one-way outlet valve pipe (30) are fixedly installed inside the side of the suction cylinder (27) away from the limit frame (23). The input end of the one-way inlet valve pipe (29) is fixedly installed inside the bottom side of the storage tank (17). The output end of the one-way outlet valve pipe (30) is fixedly installed with a sealing rotating sleeve (32). The output end of the one-way outlet valve pipe (30) is fixedly installed with a mounting base (31). One end of the mounting base (31) is fixedly installed outside the bottom side of the cavity seat (6). The scale inhibitor injection assembly includes a second piston rod (26) and a second suction cylinder (28). The second piston rod (26) is laterally slidably mounted on the outer side of the cavity seat (6) away from the top end of the first piston rod (25) via a bracket. The second suction cylinder (28) is fixedly mounted on the outer side of the cavity seat (6) near the top end of the second piston rod (26) via a bracket. One end of the second piston rod (26) is fixedly mounted at the middle position of the outer side of the limiting frame (23). The piston end of the piston is slidably sealed and installed inside one side of the suction cylinder (27). The suction cylinder (28) away from the limit frame (23) is fixedly installed with a one-way liquid inlet valve pipe (36) and a one-way liquid outlet valve pipe (37). The input end of the one-way liquid inlet valve pipe (36) is fixedly installed inside the bottom side of the storage tank (18). The output end of the one-way liquid outlet valve pipe (37) is fixedly installed inside the top side of the cavity seat (6). By monitoring and controlling the components and the spring tube, the waste hot water from the ship can be automatically circulated into the spring tube when low temperatures are encountered. At the same time, the hot water circulation drives the hollow copper rod and copper stirring rod to rotate inside the diesel fuel tank, which will drive the pour point depressant injection component to operate and inject the pour point depressant into the fuel. This will trigger the scale inhibitor injection component to operate and inject the scale inhibitor into the waste hot water.

2. The marine LNG fuel and diesel dual-source supply monitoring and control device according to claim 1, characterized in that: The top two sides of the fixed base (1) are fixedly installed with liquid storage tank one (17) and liquid storage tank two (18).

3. The marine LNG fuel and diesel dual-source supply monitoring and control device according to claim 2, characterized in that: The sealing rotating sleeve (32) is installed through the rotating seal on one side of the hollow copper rod (19). The hollow copper rod (19) has several liquid inlet holes (33) arranged at equal angles around the inside of the side close to the sealing rotating sleeve (32).

4. The marine LNG fuel and diesel dual-source supply monitoring and control device according to claim 3, characterized in that: A nozzle pipe (35) is fixedly installed on one side of each of the copper stirring rods (34), and the input end of the nozzle pipe (35) is fixedly installed inside one side of the hollow copper rod (19).

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