Fuel oil treatment system of marine diesel engine

Abstract

The invention relates to a fuel oil treatment system of a marine diesel engine. The system comprises a light diesel oil supply line, a heavy diesel oil supply line and a main oil supply line, the oil outlet end of the light diesel oil supply line and the oil outlet end of the heavy diesel oil supply line are both connected with the main oil supply line, and the other end of the main oil supply line is connected with a diesel engine. A light diesel oil supply valve is arranged between the light diesel oil supply line and the main oil supply line, a heavy diesel oil supply valve is arranged between the heavy diesel oil supply line and the main oil supply line, and a temperature control device is arranged on the main oil supply line. Flexible switching between light diesel oil and heavy diesel oil is achieved, and stable supply of fuel oil at different environment temperatures is guaranteed. The independent oil supply lines for the light diesel oil and the heavy diesel oil are arranged, the main oil supply line is connected with the diesel engine, and the oil supply valves and the temperature control device are matched, so that flexible switching and accurate control of fuel oil are achieved, and the adaptability, stability and reliability of the system are remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of marine engines, and in particular to a fuel processing system for a marine diesel engine. Background Art

[0002] Marine diesel engines are widely used in marine transport vessels and other marine equipment. With the increase in ship energy costs and increasingly stringent ship emission standards, ship operators are gradually seeking more flexible and efficient fuel treatment systems.

[0003] The existing marine diesel engine fuel treatment system has the following defects: first, the system lacks a safe, reliable and flexible switching mechanism when switching fuel types, which can easily cause fuel waste or affect the stable operation of the diesel engine due to incomplete switching; in addition, the existing system lacks an effective temperature control device and cannot adjust the fuel temperature in time according to environmental changes. Especially in low temperature environments, the stability of heavy diesel supply is difficult to guarantee, which affects the overall efficiency and reliability of the engine. Summary of the invention

[0004] A fuel processing system for a marine diesel engine provided by an embodiment of the present invention at least solves the problems of lack of a flexible fuel switching mechanism and unstable fuel temperature in the related art.

[0005] According to an embodiment of the present invention, there is provided a fuel processing system for a marine diesel engine, characterized in that it comprises a light diesel fuel supply line, a heavy diesel fuel supply line and a main fuel supply line;

[0006] The oil outlet ends of the light diesel oil supply line and the heavy diesel oil supply line are both connected to the main oil supply line, and the other end of the main oil supply line is connected to the diesel engine;

[0007] A light diesel fuel supply valve is provided between the light diesel fuel supply line and the main fuel supply line, a heavy diesel fuel supply valve is provided between the heavy diesel fuel supply line and the main fuel supply line, and a temperature control device is provided on the main fuel supply line.

[0008] According to an embodiment of the present invention, the light diesel fuel supply circuit is provided with a light diesel fuel tank, a first light diesel fuel filter and a first flow meter;

[0009] The oil outlet end of the light diesel fuel tank is connected to the oil inlet end of the first light diesel fuel line filter through a one-way valve, the oil outlet end of the first light diesel fuel filter is connected to the oil inlet end of the first flowmeter, and the oil outlet end of the first flowmeter is connected to the light diesel fuel supply valve; the oil inlet end of the light diesel fuel supply valve is connected to an air separator.

[0010] According to an embodiment of the present invention, a second light diesel filter is connected to the oil inlet end of the light diesel oil tank.

[0011] According to an embodiment of the present invention, the heavy diesel fuel supply line is provided with a heavy oil settling tank, a heavy oil heater, an oil separator and a heavy diesel fuel tank;

[0012] The oil outlet of the heavy oil settling tank is connected to the oil inlet of the heavy oil heater, the oil outlet of the heavy oil heater is respectively connected to the oil inlet of the heavy oil settling tank and the oil inlet of the oil separator, the oil outlet of the oil separator is connected to the oil inlet of the heavy diesel oil tank, and the oil outlet of the heavy diesel oil tank is connected to the heavy diesel oil supply valve via a one-way valve;

[0013] The heavy diesel oil tank is connected to the heavy oil sedimentation tank through an overflow pipe.

[0014] According to an embodiment of the present invention, the main oil supply line is provided with a main filter, an auxiliary heavy oil pump, a buffer tank, a heavy oil circulation pump, a temperature control device, a first filter, a homogenizer, and a second filter;

[0015] The oil inlet end of the main filter is connected to the light diesel oil supply line and the heavy diesel oil supply line respectively, the oil outlet end of the main filter is connected to the oil inlet end of the auxiliary heavy oil pump, the oil outlet end of the auxiliary heavy oil pump is connected to the oil inlet end of the buffer tank, the oil outlet end of the buffer tank is connected to the oil inlet end of the heavy oil circulation pump, the oil outlet end of the heavy oil circulation pump is connected to the oil inlet end of the temperature control device, the oil outlet end of the temperature control device is connected to the oil inlet end of the first filter, the oil outlet end of the first filter is connected to the oil inlet end of the homogenizer, the oil outlet end of the homogenizer is connected to the oil inlet end of the second filter, and the oil outlet end of the second filter is connected to the diesel engine;

[0016] A second flow meter is provided between the auxiliary heavy oil pump and the buffer tank.

[0017] According to an embodiment of the present invention, the oil outlet of the auxiliary heavy oil pump is also connected to the heavy diesel tank via a first pressure regulating valve, and an automatic exhaust valve is provided between the buffer tank and the heavy diesel tank.

[0018] According to an embodiment of the present invention, the first filter is provided with an automatic filter and a manual filter, the automatic filter and the manual filter are provided in parallel, and the filtering precisions of the automatic filter and the manual filter are different.

[0019] According to an embodiment of the present invention, the oil outlet end of the homogenizer is also connected to the buffer tank and the heavy diesel tank respectively, and a second pressure regulating valve is arranged between the homogenizer and the buffer tank, and the second pressure regulating valve is connected to the buffer tank through a one-way valve.

[0020] According to an embodiment of the present invention, the diesel engine is connected to the buffer tank and the heavy diesel tank respectively through a one-way valve.

[0021] According to an embodiment of the present invention, a plurality of oil supply pipelines in the light diesel oil supply line, the heavy diesel oil supply line and the main oil supply line are provided with pipeline heating devices.

[0022] Beneficial effects of the embodiments of the present invention:

[0023] The marine diesel engine fuel processing system provided by the embodiment of the present invention realizes flexible switching between light diesel and heavy diesel, ensuring a stable supply of fuel at different ambient temperatures. By setting independent fuel supply lines for light diesel and heavy diesel, connecting them to the diesel engine through the main fuel supply line, and cooperating with the fuel supply valve and temperature control device, flexible switching and precise control of the fuel are realized, which significantly improves the adaptability, stability and reliability of the system. Specifically, the independent setting of the light diesel and heavy diesel fuel supply lines avoids the mixed contamination of different fuels and ensures the purity of the fuel; the setting of the fuel supply valve makes the fuel switching process more efficient and smooth, reducing fuel waste; the temperature control device ensures the fluidity of heavy diesel in a low temperature environment, ensuring the continuity of fuel supply and the combustion efficiency of the diesel engine. In addition, the system simplifies the system structure through the integrated design of the main fuel supply line, reduces the complexity of the pipeline and the difficulty of maintenance, improves the convenience and safety of system operation, and also helps to optimize fuel cost management. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a fuel processing system for a marine diesel engine provided in an embodiment of the present invention.

[0026] In the figure: 1. diesel engine; 2. light diesel oil tank; 3. first light diesel oil filter; 4. first flow meter; 5. light diesel oil supply valve; 6. air separator; 7. second light diesel oil filter; 8. heavy oil sedimentation cabinet; 9. heavy oil heater; 10. oil separator; 11. heavy diesel oil tank; 12. heavy diesel oil supply valve; 13. main filter; 14. auxiliary heavy oil pump; 15. buffer tank; 16. heavy oil circulation pump; 17. temperature control device; 18. first filter; 19. homogenizer; 20. second filter; 21. first pressure regulating valve; 22. automatic exhaust valve; 23. automatic filter; 24. manual filter; 25. second pressure regulating valve; 26. pipeline heating device. DETAILED DESCRIPTION

[0027] Embodiments of the present embodiment will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present embodiment are shown in the accompanying drawings, it should be understood that the present embodiment can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein, which are instead provided for a more thorough and complete understanding of the present embodiment. It should be understood that the drawings and embodiments of the present embodiment are only for exemplary purposes and are not intended to limit the scope of protection of the present embodiment.

[0028] With the development of the global shipping industry, the requirements for the performance and economy of ship power systems are increasing. As the main power equipment of ships, the performance of the fuel treatment system of diesel engines is directly related to the operating efficiency and cost control of ships.

[0029] In view of the above problems, an embodiment of the present invention provides a fuel processing system for a marine diesel engine, which has a design of a light diesel oil supply line, a heavy diesel oil supply line and a main oil supply line. Through the reasonable configuration of these three lines, the system can not only realize the flexible switching of light diesel oil and heavy diesel oil, but also effectively solve the problem of poor fluidity of heavy diesel oil in a low temperature environment. By respectively setting oil supply valves on the light diesel oil supply line and the heavy diesel oil supply line, and configuring a temperature control device on the main oil supply line, the stable supply of fuel under different working conditions is ensured.

[0030] Figure 1 The present invention provides a structural schematic diagram of a fuel treatment system for a marine diesel engine. Figure 1 As shown, the fuel processing system of a marine diesel engine provided by an embodiment of the present invention includes a light diesel fuel supply line, a heavy diesel fuel supply line and a main fuel supply line.

[0031] In this embodiment, the fuel processing system includes three main parts: a light diesel fuel supply line, a heavy diesel fuel supply line and a main fuel supply line. These lines together constitute a system that can flexibly select different fuel types to supply the diesel engine 1. Due to the differences in their physical and chemical properties, light diesel and heavy diesel have different usage scenarios and advantages:

[0032] Light diesel fuel supply line: Light diesel is usually used to start diesel engines1 or when higher combustion efficiency is required because it has better combustion performance and lower viscosity.

[0033] Heavy diesel fuel supply line: Heavy diesel is usually cheaper and suitable for long-term operation or when fuel costs need to be saved, but its high viscosity may cause poor fluidity under low temperature conditions.

[0034] By integrating these two fuel lines into the same system, marine diesel engines can select the most suitable fuel under different operating conditions, thus achieving a balance between economy and performance.

[0035] The oil outlet ends of the light diesel oil supply line and the heavy diesel oil supply line are both connected to the main oil supply line, and the other end of the main oil supply line is connected to the diesel engine 1.

[0036] In this embodiment, the oil outlets of the light diesel fuel supply line and the heavy diesel fuel supply line are connected to the main fuel supply line, allowing the light diesel fuel and the heavy diesel fuel to flow to the main fuel supply line at a specific time through their respective fuel supply lines, and finally enter the diesel engine 1. This line configuration can realize the switching supply of different fuels while ensuring the transmission stability of the fuel.

[0037] The other end of the main oil supply line is directly connected to the diesel engine 1 , that is to say, whether it is light diesel or heavy diesel, it eventually enters the diesel engine 1 through the main oil supply line for combustion, thereby providing power for the diesel engine 1 .

[0038] The above three oil supply lines are highly flexible, allowing the diesel engine 1 to choose to use light diesel or heavy diesel according to different operating conditions (such as the start-up phase, long-distance navigation or low-temperature environment), thereby improving the adaptability of the system.

[0039] A light diesel fuel supply valve 5 is provided between the light diesel fuel supply line and the main fuel supply line, a heavy diesel fuel supply valve 12 is provided between the heavy diesel fuel supply line and the main fuel supply line, and a temperature control device 17 is provided on the main fuel supply line.

[0040] In this embodiment, the function of the light diesel fuel supply valve 5 is to control the time and flow rate of light diesel fuel entering the main fuel supply line from the light diesel fuel supply line. By opening or closing the light diesel fuel supply valve 5, the supply of light diesel fuel can be accurately controlled. Similarly, the heavy diesel fuel supply valve 12 controls the supply of heavy diesel fuel. By adjusting the heavy diesel fuel supply valve 12, it is possible to ensure that the supply of heavy diesel fuel is switched in time when needed, and it can be coordinated with the light diesel fuel supply to avoid fuel supply interruption.

[0041] The light diesel fuel supply valve 5 and the heavy diesel fuel supply valve 12 provide flexibility and precise control for fuel switching, ensuring that the diesel engine 1 switches seamlessly between different fuels without causing unstable fuel supply or fuel waste.

[0042] Due to the high viscosity of heavy diesel, it is easy to condense under low temperature conditions, resulting in poor fluidity. Therefore, the temperature control device 17 can increase the temperature of the heavy diesel by heating to improve its fluidity, thereby ensuring that the heavy diesel can smoothly enter the diesel engine 1 for combustion. In addition, the temperature control device 17 is also applicable to the supply of light diesel, ensuring that the fuel is in a suitable temperature range before entering the diesel engine 1, thereby improving combustion efficiency and power output.

[0043] In an optional embodiment, the light diesel fuel supply circuit is provided with a light diesel fuel tank 2, a first light diesel fuel filter 3 and a first flow meter 4;

[0044] The oil outlet end of the light diesel fuel tank 2 is connected to the oil inlet end of the first light diesel fuel line filter through a one-way valve, the oil outlet end of the first light diesel fuel filter 3 is connected to the oil inlet end of the first flowmeter 4, and the oil outlet end of the first flowmeter 4 is connected to the light diesel fuel supply valve 5; the oil inlet end of the light diesel fuel supply valve 5 is connected to an air separator 6.

[0045] In this embodiment, the light diesel fuel tank 2 is a container for storing light diesel fuel, and its main function is to provide sufficient light diesel fuel for the system. Optionally, the tank can be provided with a liquid level monitoring device to monitor the amount of light diesel fuel in the tank in real time to ensure the reliability of fuel supply when the system is running.

[0046] The first light diesel filter 3 can be used to filter the light diesel to ensure that impurities in the fuel do not enter the system and avoid damage to the engine and fuel supply system. The first light diesel filter 3 can use a filter screen or filter element with moderate precision to remove impurities with larger particles. Optionally, in order to improve the filtering accuracy, the filter can adopt a multi-stage filtering structure. For example, a pre-filter is added to intercept large particles of impurities, and then fine filtering is performed through the main filter to further protect downstream equipment.

[0047] The first flow meter 4 is used to monitor the fuel flow through the light diesel fuel supply line in real time to ensure that the system can stably supply fuel according to the set fuel demand. The flow meter can not only detect the flow of light diesel, but also work with the control system to adjust the fuel supply through feedback to optimize the fuel supply of the engine. Optionally, the flow meter can be an electronic flow meter with higher measurement accuracy and remote monitoring function, which can transmit and record real-time data through the ship control system to improve the automation level of the system.

[0048] The light diesel fuel supply valve 5 is located between the light diesel fuel supply line and the main fuel supply line to control the supply of light diesel fuel to the main fuel supply line. By opening or closing the valve, the system can flexibly switch between light diesel fuel and heavy diesel fuel to meet the different fuel requirements of the diesel engine 1.

[0049] The air separator 6 is installed at the oil inlet end of the light diesel fuel supply valve 5, and is mainly used to separate the air in the light diesel fuel. Air mixed in the fuel will lead to unstable fuel supply and affect the combustion efficiency of the diesel engine 1. Therefore, the air separator 6 plays a key role in improving the purity of the fuel.

[0050] In an optional embodiment, a second light diesel oil filter 7 is connected to the oil inlet end of the light diesel oil tank 2 .

[0051] In this embodiment, in the light diesel fuel supply line, a second light diesel filter 7 is added to the oil inlet end of the light diesel tank 2. The second light diesel filter 7 is added to the oil inlet end of the light diesel tank 2, which can perform preliminary filtering on the fuel before it enters the tank to remove particles, impurities and moisture that may exist in it. This ensures that the light diesel has been preliminarily purified before entering the tank, avoiding system failures caused by precipitation or contamination of fuel impurities in the tank.

[0052] Since the light diesel system usually needs to go through multiple filtering stages, a two-stage filtration is formed between the second light diesel filter 7 and the first light diesel filter 3. This cascade design can further improve the reliability of the system. The second light diesel filter 7, as a primary filter, can reduce the burden of subsequent filters, extend their service life, and reduce maintenance frequency. The second filter removes most of the larger particles and pollutants, while the first filter more finely filters the remaining tiny particles and impurities, ensuring that the light diesel entering the diesel engine 1 has a higher degree of cleanliness.

[0053] In an optional embodiment, the heavy diesel fuel supply line is provided with a heavy oil sedimentation tank 8, a heavy oil heater 9, an oil separator 10 and a heavy diesel fuel tank 11.

[0054] The oil outlet of the heavy oil settling tank 8 is connected to the oil inlet of the heavy oil heater 9, and the oil outlet of the heavy oil heater 9 is respectively connected to the oil inlet of the heavy oil settling tank 8 and the oil inlet of the oil separator 10, and the oil outlet of the oil separator 10 is connected to the oil inlet of the heavy diesel tank 11, and the oil outlet of the heavy diesel tank 11 is connected to the heavy diesel supply valve 12 through a one-way valve; the heavy diesel tank 11 is connected to the heavy oil settling tank 8 through an overflow pipe.

[0055] In this embodiment, by optimizing the fuel supply process of heavy diesel oil, it is ensured that the heavy diesel oil is fully precipitated, heated and purified before entering the marine diesel engine, thereby ensuring the stability of fuel supply and the efficiency of combustion.

[0056] The heavy oil settling tank 8 is used for the preliminary treatment of heavy diesel oil. Its main function is to allow larger particles of impurities and water to settle naturally by standing still, so as to prevent impurities from entering the subsequent heating and oil separation process. The heavy oil settling tank 8 can effectively remove solid impurities and water in heavy diesel oil, prevent clogging and wear of subsequent processing equipment, thereby extending the service life of the equipment and ensuring the stability of the oil supply system.

[0057] Heavy diesel has a high viscosity, and its fluidity is poor, especially under low temperature conditions, so it needs to be heated by a heavy diesel heater 9 during the fuel supply process. The heavy diesel heater 9 usually uses the waste heat of the diesel engine 1 or a special electric heating device to make the temperature of the heavy diesel reach a range suitable for flow and combustion. The fluidity of the heated heavy diesel is enhanced, which can not only improve the fuel supply efficiency, but also improve the combustion performance and reduce carbon deposition and pollutant emissions caused by incomplete combustion.

[0058] The oil separator 10 can be used to further purify the heavy diesel oil, mainly by completely separating the fine impurities and water in the oil product through the action of centrifugal force. Since the composition of heavy diesel oil is complex and may contain a certain amount of water and fine impurities, the oil separator 10 separates substances of different densities through high-speed rotation to ensure that the heavy diesel oil has reached a high level of purification before entering the fuel tank. The purification function of the oil separator 10 is crucial, especially in improving the cleanliness of the fuel, thereby avoiding damage to the inside of the diesel engine 1.

[0059] The heavy diesel oil after precipitation and purification is stored in the heavy diesel oil tank 11. The heavy diesel oil tank 11 not only serves as a storage, but also provides a stable fuel source for the entire heavy diesel oil supply system. The tank is connected to the downstream oil supply line, and the heavy diesel oil enters the oil supply pipeline through the outlet in the tank and flows to the heavy diesel oil supply valve 12 through the one-way valve. The setting of the one-way valve can prevent the heavy diesel oil from flowing back and ensure stable oil supply.

[0060] The heavy diesel fuel tank 11 is connected to the heavy oil settling tank 8 via an overflow pipe. The overflow pipe is used to prevent excessive heavy diesel fuel in the tank from overflowing and to discharge the excess fuel back into the heavy oil settling tank 8 for further precipitation or treatment.

[0061] In an optional embodiment, the main oil supply line is provided with a main filter 13, an auxiliary heavy oil pump 14, a buffer tank 15, a heavy oil circulation pump 16, a temperature control device 17, a first filter 18, a homogenizer 19 and a second filter 20;

[0062] The oil inlet end of the main filter 13 is connected to the light diesel oil supply line and the heavy diesel oil supply line respectively, the oil outlet end of the main filter 13 is connected to the oil inlet end of the auxiliary heavy oil pump 14, the oil outlet end of the auxiliary heavy oil pump 14 is connected to the oil inlet end of the buffer tank 15, the oil outlet end of the buffer tank 15 is connected to the oil inlet end of the heavy oil circulation pump 16, the oil outlet end of the heavy oil circulation pump 16 is connected to the oil inlet end of the temperature control device 17, the oil outlet end of the temperature control device 17 is connected to the oil inlet end of the first filter 18, the oil outlet end of the first filter 18 is connected to the oil inlet end of the homogenizer 19, the oil outlet end of the homogenizer 19 is connected to the oil inlet end of the second filter 20, the oil outlet end of the second filter 20 is connected to the diesel engine 1, and a second flow meter is arranged between the auxiliary heavy oil pump 14 and the buffer tank 15.

[0063] In this embodiment, the main fuel supply line is equipped with multiple key components to ensure adequate processing and supply of fuel. These components include: main filter 13, auxiliary heavy oil pump 14, buffer tank 15, heavy oil circulation pump 16, temperature control device 17, first filter 18, homogenizer 19 and second filter 20. Through complex connections, they form a complete fuel supply system to ensure that the fuel reaches appropriate fluidity and cleanliness before entering the diesel engine 1, thereby improving the performance and operating stability of the diesel engine 1.

[0064] The main filter 13 is used to filter impurities in the fuel in the system and is located at the connection point between the light diesel fuel supply line and the heavy diesel fuel supply line and the main fuel supply line. Through the main filter 13, it can be ensured that the fuel entering from the two different fuel lines is initially filtered before entering the main fuel supply line, preventing impurities from entering the subsequent fuel supply equipment, thereby protecting the pump and filter in the system.

[0065] The auxiliary heavy oil pump 14 is used to increase the pressure of the heavy diesel oil to ensure that it can flow smoothly through the subsequent processing equipment, especially when the viscosity of the heavy diesel oil is high or the ambient temperature is low, the heavy oil pump can provide sufficient power to keep the heavy diesel oil in good fluidity. The auxiliary heavy oil pump 14 is connected after the main filter 13, and its oil outlet is connected to the buffer tank 15 to ensure that the fuel enters the buffer tank 15 after being pressurized.

[0066] The function of the buffer tank 15 is to provide a stable fuel storage space for the system to prevent fluctuations in the fuel supply process from affecting the stable operation of subsequent equipment. By balancing the fuel flow, the stability of the fuel supply is ensured, and sufficient fuel source is provided for the heavy oil circulation pump 16.

[0067] The heavy oil circulation pump 16 is responsible for extracting the fuel oil from the buffer tank 15 and pushing it to the temperature control device 17. It plays a key role in keeping the fuel oil flowing in the system, especially when the ship is running for a long time, to ensure that the fuel oil will not stagnate or solidify in the pipeline. Through the circulation of the heavy oil circulation pump 16, the fuel oil can continue to flow in the system, providing a good foundation for subsequent heating and filtration.

[0068] The temperature control device 17 is an important component in the fuel system, and temperature control is particularly important when processing heavy diesel. Heavy diesel has high viscosity and poor fluidity at low temperatures, so it needs to be heated to reduce its viscosity and ensure that the fuel can flow smoothly into the diesel engine 1. The temperature control device 17 is responsible for accurately adjusting the temperature of the fuel to ensure that the fuel enters the subsequent processing unit at a suitable temperature.

[0069] In actual applications, the light diesel flow path is temperature-controlled by the temperature control device 17 so that when the system switches from heavy diesel to light diesel, the light diesel maintains a higher temperature and flushes the heavy diesel in the pipeline to prevent the heavy diesel from cooling and solidifying in the pipeline and blocking the fuel pipeline.

[0070] At the moment of switching between light and heavy oil, the temperature in the fuel pipeline is guaranteed not to change drastically, so that the heavy oil can be kept burning at 100-130℃.

[0071] The first filter 18 is arranged after the temperature control device 17 and is responsible for filtering the heated fuel again. This filtering process is very important because impurities may be dissolved or precipitated during the heating process, especially unburned residues or solid particles may exist in heavy diesel. Through the treatment of the first filter 18, the fuel can be further purified to ensure that the fuel purity meets the requirements of the diesel engine 1.

[0072] The function of the homogenizer 19 is to homogenize the fuel, especially the large particles and uneven components in the heavy diesel. Through the processing of the homogenizer 19, the large particles in the fuel can be broken up and evenly mixed to avoid incomplete combustion or poor fuel supply due to uneven fuel components.

[0073] The second filter 20 is arranged after the homogenizer 19 as the final filtering step to ensure that the fuel entering the diesel engine 1 reaches the highest cleanliness requirement. Through this filter, it can be ensured that impurities that may still exist after the homogenization process are completely removed, ensuring that the fuel supply during the operation of the diesel engine 1 is stable and reliable.

[0074] In an optional embodiment, the oil outlet of the auxiliary heavy oil pump 14 is also connected to the heavy diesel tank 11 through a first pressure regulating valve 21 , and an automatic exhaust valve 22 is provided between the buffer tank 15 and the heavy diesel tank 11 .

[0075] In this embodiment, the oil outlet of the auxiliary heavy oil pump 14 is also connected to the heavy diesel tank 11 through the first pressure regulating valve 21. Since the viscosity of heavy oil is high, especially under low temperature conditions, its fluidity is poor, and the auxiliary pump ensures the stable flow of heavy diesel in this process.

[0076] The function of the first pressure regulating valve 21 is to maintain the pressure in the fuel system stable, and avoid poor fuel supply or fuel waste due to pressure fluctuations. In the heavy oil supply line, the viscosity and density of heavy diesel oil vary greatly, so it is very important to maintain a constant fuel supply pressure. By setting the first pressure regulating valve 21 at the oil outlet of the auxiliary heavy oil pump 14, it is ensured that the heavy diesel oil entering the main fuel supply line is maintained within an appropriate pressure range, avoiding excessive fuel supply due to excessive fuel supply pressure or affecting the fuel supply of the diesel engine 1 due to too low pressure.

[0077] Connecting the oil outlet of the auxiliary heavy oil pump 14 to the heavy diesel tank 11 is a feedback design. During operation, if the pressure of the fuel system is too high, the first pressure regulating valve 21 can guide the excess fuel back to the heavy diesel tank 11 to prevent pressure overload in the system and protect the fuel pipeline and related devices from damage. At the same time, this circulation design also avoids the waste of fuel, and the unconsumed fuel can be reused, which improves the efficiency of fuel use.

[0078] In this embodiment, an automatic exhaust valve 22 is provided between the buffer tank 15 and the heavy diesel tank 11. The function of the buffer tank 15 is to stabilize the flow of fuel, absorb pressure fluctuations in the system, and ensure the stability of fuel supply. The function of the automatic exhaust valve 22 is to discharge the gas in the system during the fuel supply process to prevent gas accumulation in the pipeline, causing fuel supply blockage or unstable operation of the fuel system of the diesel engine 1. The automatic exhaust valve design can automatically discharge excess gas when the system is running without manual intervention, simplifying the operation of the system.

[0079] In an optional embodiment, the first filter 18 is provided with an automatic filter 23 and a manual filter 24, the automatic filter 23 and the manual filter 24 are arranged in parallel, and the filtering precisions of the automatic filter 23 and the manual filter 24 are different.

[0080] In the fuel treatment system of a marine diesel engine, the main function of the filter is to remove impurities and particles in the fuel to ensure that the fuel reaches a certain purity before entering the diesel engine 1. Impurities in the fuel will have a negative impact on the combustion process and operation of the diesel engine 1, and may cause nozzle blockage, incomplete combustion, and even affect the life of the diesel engine 1. Therefore, the filter is a key component in the fuel treatment system.

[0081] The automatic filter 23 has an automatic cleaning function, which can continuously monitor and remove impurities in the fuel, reducing the frequency of manual intervention. It is suitable for use when the ship is in operation for a long time, because the automatic filter 23 can provide a stable filtering effect and does not require frequent maintenance. This design is particularly important for ships that operate for a long time, because it can reduce downtime for maintenance and improve the stability and reliability of the system.

[0082] The manual filter 24 can be used as a backup system. When the automatic filter 23 fails or needs maintenance, the manual filter 24 can play an emergency filtering role. The advantages of the manual filter 24 are that it has a simple structure and is easy to maintain. In certain circumstances, such as when the automatic system has problems, manual operation can still ensure the normal operation of the fuel system.

[0083] The parallel setting means that the two filters can be used simultaneously or separately. This improves the redundancy and reliability of the system. In normal operation, the automatic filter 23 can bear most of the workload, while when necessary, the manual filter 24 can take over to ensure the continuity of fuel treatment.

[0084] In practical applications, the different filtration accuracies of the automatic filter 23 and the manual filter 24 allow the selection of an appropriate filter according to different fuel requirements or operating environments. For example, the automatic filter 23 can be set to process larger particles of impurities to maintain long-term stable operation; while the manual filter 24 can be set to process finer particles. In certain specific cases, such as when the diesel engine 1 is operating under high-precision combustion requirements, the manual filter 24 can provide a higher filtration accuracy.

[0085] In an optional embodiment, the oil outlet end of the homogenizer 19 is also connected to the buffer tank 15 and the heavy diesel tank 11 respectively, and a second pressure regulating valve 25 is arranged between the homogenizer 19 and the buffer tank 15, and the second pressure regulating valve 25 is connected to the buffer tank 15 through a one-way valve.

[0086] In this embodiment, the function of the homogenizer 19 is to homogenize the impurities in the heavy oil, so that the composition of the fuel is more uniform before entering the diesel engine 1, thereby improving the quality and combustion effect of the fuel. In order to ensure that the heavy diesel oil after homogenization can be stably supplied in the system, an oil return channel is set between the oil outlet of the homogenizer 19 and the buffer tank 15. During operation, part of the fuel can return to the buffer tank 15 through the oil return channel, thereby maintaining the pressure stability of the system.

[0087] The oil outlet of the homogenizer 19 can also be directly connected to the heavy diesel tank 11, so that part of the heavy diesel after homogenization can be stored again before being burned by the diesel engine 1. This connection method ensures flexibility and efficiency in the fuel recycling process, especially when the fuel demand is not large, the excess fuel can be directly returned to the tank for storage.

[0088] The second pressure regulating valve 25 between the homogenizer 19 and the buffer tank 15 is connected to the buffer tank 15 through a one-way valve. The fuel pressure between the homogenizer 19 and the buffer tank 15 can be controlled to prevent excessive pressure from damaging the fuel supply system. Through the setting of the pressure regulating valve, the system can adjust the flow speed and pressure of the fuel according to actual needs to ensure the stability and safety of the fuel supply process. At the same time, the design of the one-way valve ensures the one-way flow of the fuel to prevent the adverse effects of backflow on the system.

[0089] In an optional embodiment, the diesel engine 1 is connected to the buffer tank 15 and the heavy diesel tank 11 respectively through a one-way valve.

[0090] In this embodiment, the output end of the diesel engine 1 is connected to the buffer tank 15 and the heavy diesel tank 11 respectively through a one-way valve. It can ensure that the fuel supply of the diesel engine 1 can flow back to the buffer tank 15 or the heavy diesel tank 11. When the diesel engine 1 does not need additional fuel during operation or when the fuel supply system detects that the fuel supply is too much, the fuel can flow back to the buffer tank 15 or the heavy diesel tank 11 through the one-way valve, thereby avoiding the unstable fuel supply caused by excessive fuel supply pressure. The one-way valve ensures that the fuel can only flow in one direction, preventing the fuel from flowing back when the diesel engine 1 stops, and ensuring the stability of the oil pressure in the system.

[0091] When the fuel supply system detects that the fuel supply pressure is too high, the excess fuel will flow back to the buffer tank 15, and the buffer tank 15 can absorb this part of the fuel to ensure the stability of the fuel supply pressure.

[0092] When the fuel is overfilled during the supply process or when the fuel needs to be recovered in the fuel supply system, the heavy diesel tank 11 is the main storage location. By connecting to the one-way valve of the diesel engine 1, the system can flexibly return the fuel to the heavy diesel tank 11, thereby maintaining the recycling of the fuel in the tank.

[0093] In an optional embodiment, a pipeline heating device 26 is provided on multiple oil supply pipelines in the light diesel oil supply line, the heavy diesel oil supply line and the main oil supply line.

[0094] In this embodiment, in order to ensure the fluidity of the fuel, the light diesel oil, heavy diesel oil and multiple fuel supply pipelines in the main fuel supply line are equipped with heating devices. The heating device prevents the viscosity of the fuel from increasing in a low temperature environment by heating the fuel supply pipeline, thereby ensuring the normal flow of the fuel.

[0095] In the working environment of marine diesel engines, they may encounter extremely low temperatures, especially when sailing to cold areas. The viscosity of diesel will increase, resulting in poor fluidity, which will affect the efficiency of the fuel supply system. The heating device maintains the temperature in the pipeline to ensure that the fuel can maintain proper fluidity and avoid oil line blockage caused by low temperature.

[0096] The heavy oil processing system for marine diesel engines of this embodiment realizes flexible switching between light diesel and heavy diesel through two independent fuel lines, combines various devices to ensure efficient operation of the fuel system, and takes into account various functions such as fuel heating, filtering, and pressure regulation. The following is a detailed description of the working principle of the system.

[0097] The fuel processing system includes a light diesel fuel supply line, a heavy diesel fuel supply line and a main fuel supply line. Light diesel fuel and heavy diesel fuel are transported to the main fuel supply line through their respective fuel supply lines and finally supplied to the diesel engine 1. In order to ensure a stable fuel supply, various filtering, heating, separation and regulating devices are installed to ensure the cleanliness, fluidity and fuel supply pressure of the fuel. The system also includes a pipeline heating device 26, which is used to heat the fuel supply pipeline in a low temperature environment to ensure the normal flow of the fuel.

[0098] Working principle of light diesel fuel supply line:

[0099] The light diesel oil tank 2 stores light diesel oil and transmits it to the first light diesel oil filter 3 through a pipeline. The first filter is used to initially filter the light diesel oil to remove possible impurities and ensure the cleanliness of the fuel.

[0100] The light diesel fuel filtered by the first light diesel fuel filter 3 flows into the first flow meter 4, and the fuel flow is measured by the first flow meter 4 to ensure that the system can accurately control the supply of light diesel fuel.

[0101] The light diesel oil flowing through the first flow meter 4 is delivered to the light diesel oil supply valve 5, which controls the light diesel oil to enter the main oil supply line. Before this, the light diesel oil needs to pass through the air separator 6, which can remove the air in the fuel oil to prevent air blocking during the oil supply process.

[0102] After passing through the light diesel fuel supply valve 5 , the light diesel fuel enters the main fuel supply line and is finally sent to the diesel engine 1 through the main fuel supply line.

[0103] Working principle of heavy diesel fuel supply line:

[0104] The heavy oil settling tank 8 stores and settles the heavy diesel oil to separate solid impurities or water in the heavy diesel oil. The settled heavy diesel oil is sent to the heavy oil heater 9 from the settling tank.

[0105] The heavy oil heater 9 heats the heavy diesel oil to reduce its viscosity and improve its fluidity. The heated heavy diesel oil can flow smoothly in the system, which is especially necessary in cold environments.

[0106] The heated heavy diesel oil is transported to an oil separator 10, which is used to further separate impurities and water in the heavy diesel oil to ensure the purity of the heavy diesel oil.

[0107] The heavy diesel separated by the oil separator 10 enters the heavy diesel tank 11 and is transported to the heavy diesel supply valve 12 through the heavy diesel stored in the tank. The valve controls the heavy diesel to enter the main supply line.

[0108] The system is also designed with an overflow pipe. When the oil level in the heavy diesel tank 11 is too high, the overflowed heavy diesel will return to the heavy oil sedimentation tank 8 through the overflow pipe to keep the fuel level in the tank stable.

[0109] Working principle of the main oil supply line:

[0110] Regardless of whether the fuel comes from the light diesel fuel supply line or the heavy diesel fuel supply line, it will be further filtered through the main filter 13. The main filter 13 ensures the purity of the fuel and prevents impurities in the fuel from entering the diesel engine 1.

[0111] The fuel that passes through the main filter 13 enters the auxiliary heavy oil pump 14. The auxiliary heavy oil pump 14 is responsible for pumping the fuel from the main filter 13 to the buffer tank 15. The function of the buffer tank 15 is to balance the pressure of the fuel supply.

[0112] The fuel flows from the buffer tank 15 into the heavy oil circulation pump 16, which further improves the fluidity of the fuel and sends the fuel to the temperature control device 17. The temperature control device 17 can adjust the temperature of the fuel according to actual needs to ensure that the fuel always maintains a suitable temperature, thereby improving the fuel supply efficiency and fuel fluidity.

[0113] The fuel treated by the temperature control device 17 enters the first filter 18. The first filter 18 is divided into an automatic filter 23 and a manual filter 24, which are arranged in parallel. The two have different filtering accuracies and are used for multi-level filtering needs.

[0114] The fuel treated by the first filter 18 enters the homogenizer 19, which further mixes the components in the fuel to make the fuel uniform. The homogenized fuel passes through the second filter 20 for final purification and filtration to ensure the high quality of the fuel.

[0115] Finally, the fuel after filtration and homogenization is sent to the diesel engine 1 through the main fuel supply line for combustion by the diesel engine 1. The output end of the diesel engine 1 is connected to the buffer tank 15 and the heavy diesel tank 11 through a one-way valve to ensure the reflux management of the fuel during the supply process. When the fuel supply is excessive, the fuel can flow back to the buffer tank 15 or the heavy diesel tank 11 through the one-way valve to balance the fuel pressure in the system.

[0116] Pipeline heating device 26:

[0117] Pipeline heating devices 26 are installed on multiple oil supply pipelines of the light diesel oil supply line, heavy diesel oil supply line and main oil supply line of the system. These heating devices are used to heat the pipelines in a low temperature environment to ensure that the fuel will not condense or reduce its fluidity due to the low temperature, thereby ensuring the normal operation of the oil supply system in a low temperature environment.

[0118] System control and regulation:

[0119] Each valve in the system (such as the light diesel fuel supply valve 5, the heavy diesel fuel supply valve 12, etc.) is intelligently controlled through a corresponding control device to ensure the reasonable switching and supply of light diesel and heavy diesel.

[0120] The first pressure regulating valve 21 and the second pressure regulating valve 25 are used to regulate the pressure of the system during the fuel supply process to maintain the pressure balance and stability of the system.

[0121] The automatic exhaust valve 22 is used to release the excess air in the system to prevent the presence of gas in the oil supply pipeline and affect the oil supply effect.

[0122] The fuel treatment system provided by the embodiment of the present invention realizes the flexible switching and supply of light diesel and heavy diesel through reasonable oil circuit design and efficient filtering, heating, circulation and regulating devices. The mutual cooperation between the various devices ensures that the system can maintain efficient and stable fuel supply under various working conditions. Especially in cold environments, the application of the heating device and the temperature control device 17 can ensure the normal supply and flow of fuel at low temperatures.

[0123] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0124] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0125] The various steps described in the method implementation methods provided in the embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0126] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0127] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A fuel treatment system for a marine diesel engine, characterized in that: Including light diesel fuel supply line, heavy diesel fuel supply line and main fuel supply line; The oil outlet ends of the light diesel oil supply circuit and the heavy diesel oil supply circuit are both connected to the main oil supply circuit, and the other end of the main oil supply circuit is connected to the diesel engine (1); A light diesel fuel supply valve (5) is provided between the light diesel fuel supply line and the main fuel supply line, a heavy diesel fuel supply valve (12) is provided between the heavy diesel fuel supply line and the main fuel supply line, and a temperature control device (17) is provided on the main fuel supply line.

2. The fuel processing system according to claim 1, characterized in that: The light diesel fuel supply circuit is provided with a light diesel fuel tank (2), a first light diesel fuel filter (3) and a first flow meter (4); The oil outlet end of the light diesel fuel tank (2) is connected to the oil inlet end of the first light diesel fuel line filter via a one-way valve, the oil outlet end of the first light diesel fuel filter (3) is connected to the oil inlet end of the first flow meter (4), and the oil outlet end of the first flow meter (4) is connected to the light diesel fuel supply valve (5); the oil inlet end of the light diesel fuel supply valve (5) is connected to an air separator (6).

3. The fuel processing system according to claim 2, characterized in that: The oil inlet end of the light diesel oil tank (2) is connected to a second light diesel oil filter (7).

4. The fuel processing system according to claim 1, characterized in that: The heavy diesel fuel supply line is provided with a heavy oil sedimentation cabinet (8), a heavy oil heater (9), an oil separator (10) and a heavy diesel fuel tank (11); The oil outlet of the heavy oil settling tank (8) is connected to the oil inlet of the heavy oil heater (9), the oil outlet of the heavy oil heater (9) is respectively connected to the oil inlet of the heavy oil settling tank (8) and the oil inlet of the oil separator (10), the oil outlet of the oil separator (10) is connected to the oil inlet of the heavy diesel oil tank (11), and the oil outlet of the heavy diesel oil tank (11) is connected to the heavy diesel oil supply valve (12) via a one-way valve; The heavy diesel oil tank (11) is connected to the heavy oil sedimentation tank (8) via an overflow pipe.

5. The fuel processing system according to claim 4, characterized in that: The main oil supply line is provided with a main filter (13), an auxiliary heavy oil pump (14), a buffer tank (15), a heavy oil circulation pump (16), a temperature control device (17), a first filter (18), a homogenizer (19) and a second filter (20); The oil inlet end of the main filter (13) is connected to the light diesel oil supply line and the heavy diesel oil supply line respectively, the oil outlet end of the main filter (13) is connected to the oil inlet end of the auxiliary heavy oil pump (14), the oil outlet end of the auxiliary heavy oil pump (14) is connected to the oil inlet end of the buffer tank (15), the oil outlet end of the buffer tank (15) is connected to the oil inlet end of the heavy oil circulation pump (16), the oil outlet end of the heavy oil circulation pump (16) is connected to the oil inlet end of the temperature control device (17), the oil outlet end of the temperature control device (17) is connected to the oil inlet end of the first filter (18), the oil outlet end of the first filter (18) is connected to the oil inlet end of the homogenizer (19), the oil outlet end of the homogenizer (19) is connected to the oil inlet end of the second filter (20), and the oil outlet end of the second filter (20) is connected to the diesel engine (1); A second flow meter is provided between the auxiliary heavy oil pump (14) and the buffer tank (15).

6. The fuel processing system according to claim 5, characterized in that: The oil outlet of the auxiliary heavy oil pump (14) is also connected to the heavy diesel oil tank (11) via a first pressure regulating valve (21), and an automatic exhaust valve (22) is provided between the buffer tank (15) and the heavy diesel oil tank (11).

7. The fuel processing system according to claim 5, characterized in that: The first filter (18) is provided with an automatic filter (23) and a manual filter (24); the automatic filter (23) and the manual filter (24) are arranged in parallel; and the filtering accuracies of the automatic filter (23) and the manual filter (24) are different.

8. The fuel processing system according to claim 5, characterized in that: The oil outlet end of the homogenizer (19) is also connected to the buffer tank (15) and the heavy diesel tank (11) respectively. A second pressure regulating valve (25) is provided between the homogenizer (19) and the buffer tank (15). The second pressure regulating valve (25) is connected to the buffer tank (15) via a one-way valve.

9. The fuel processing system according to claim 4, characterized in that: The diesel engine (1) is connected to the buffer tank (15) and the heavy diesel tank (11) respectively through a one-way valve.

10. The fuel processing system according to claim 1, characterized in that: A pipeline heating device (26) is provided on multiple oil supply pipelines in the light diesel oil supply line, the heavy diesel oil supply line and the main oil supply line.

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