1399 results about "Diesel fuel" patented technology

The invention relates to the technical field of ship power, in particular to a dual-fuel ship fuel switching method and device and a storage medium, and the method comprises the steps that first engine performance data and engine state data corresponding to the first engine performance data are acquired; preprocessing the first engine performance data and the engine state data; the preprocessed first engine performance data are input into a target prediction control model for switching strategy prediction, and a fuel switching strategy corresponding to the engine is obtained; inputting the engine state data into the target fault prediction model for fault prediction to obtain a switching decision; a fuel switching strategy is sent to the control module according to the switching decision, so that the control module processes the fuel switching process according to the fuel switching strategy; and second engine performance data are received, and the fuel switching strategy is adjusted according to the second engine performance data. And seamless switching or cooperative use between liquefied natural gas and diesel oil of a ship can be met.

A refuse vehicle includes a chassis. The chassis includes a right frame member and a left frame member spaced apart in a lateral direction and extending lengthwise in a longitudinal direction, the right frame member being separate from the left frame member. The refuse vehicle further includes a body supported by the right frame member and the left frame member, the body defining a refuse compartment, and a hydrogen power system including a plurality of fuel cells longitudinally disposed along the chassis, positioned between the right frame member and the left frame member. The hydrogen power system may also include plurality of fuel pods for providing hydrogen to the fuel cells. The hydrogen power system can be packaged in modular pods on various locations of the refuse vehicle. The hydrogen power system can work in conjunction with other power sources or fuels (e.g., electric batteries, ultra-capacitors, diesel ICE, CNG, etc.).

The invention discloses an air-fuel ratio control method for a high-pressure direct injection engine in a diesel-natural gas dual-fuel cylinder, and relates to the technical field of engine control, and the air-fuel ratio control method comprises the following steps: collecting diesel mass flow, natural gas volume flow and natural gas component data, and determining a diesel-natural gas mixing ratio; a basic target air-fuel ratio is obtained by combining the real-time rotating speed of an engine, the load and the diesel oil-natural gas mixing proportion; based on the pressure and temperature of the intake manifold and the rotating speed of the engine, the target air-fuel ratio after model correction is obtained; the working condition load change rate is detected, the pre-optimized air-fuel ratio trajectory MAP is called, and a transient correction target value is generated; calculating the deviation between the transient correction target value and the measured value of the air-fuel ratio sensor and the deviation change rate, and outputting an air-fuel ratio correction value; and the final target air-fuel ratio is calculated and sent to an air flow control valve to execute air inlet adjustment. The method is suitable for engine application scenes requiring high-precision and self-adaptive control to improve combustion efficiency and reduce emission.

A retrofit mining haul truck includes a hybrid hydrogen fuel cell / battery-based powerplant in place of a carbon fuel-based powerplant. The retrofit mining haul truck includes a frame, a tray coupled to the frame, and a deck coupled to the frame forward of at least a portion of the tray. A battery system is mounted to the deck of the retrofit mining haul truck. A hydrogen storage system (HSS) is installed in an engine bay volume of the retrofit mining haul truck. The engine bay was configured to contain a combustion engine (e.g., a diesel engine) prior to retrofitting the retrofit mining haul truck. At least a portion of a fuel cell system is installed in a wheel pocket of the retrofit mining haul truck. The wheel pocket was configured to contain a diesel tank prior to retrofitting the retrofit mining haul truck.

The invention relates to an oil-soluble viscosity reducer composition and a preparation method and application thereof.The oil-soluble viscosity reducer composition is formed by compounding alkyl pyridine and coker diesel oil and can rapidly permeate into thick oil, the viscosity of the thick oil is greatly reduced, and the fluidity of the thick oil is improved. When the oil-soluble viscosity reducer is used in heavy oil reservoir exploitation, storage and transportation processes, the use amount of thin oil for blending heavy oil with thin oil can be saved, the cost of the oil-soluble viscosity reducer is reduced, efficient exploitation, gathering and transportation of the heavy oil reservoir are guaranteed, cost-reducing and efficiency-increasing exploitation of the heavy oil reservoir is realized, and high-added-value comprehensive utilization of coker diesel oil is facilitated.

The utility model discloses a gearbox for an oil-electricity double-engine ship. The gearbox comprises a box body, the diesel oil input component comprises a first input shaft, a first driving gear is sleeved on the first input shaft, and the first input shaft is provided with a first transmission gear and a first clutch; the reversing shaft part comprises a reversing shaft, a second driving gear is sleeved on the reversing shaft, the reversing shaft is provided with a second transmission gear and a second clutch, and the second transmission gear is meshed with the first transmission gear; the motor input component comprises a second input shaft, the second input shaft is sleeved with a third driving gear in an empty mode, the third driving gear is meshed with a first driven gear, the second driving gear is fixedly sleeved with the first driven gear, and the second input shaft is provided with a third clutch; the output shaft component comprises an output shaft and a second driven gear, and the second driven gear is meshed with the first driving gear and the second driving gear. According to the scheme, the diesel engine or the motor is independently used for driving, intelligent switching of the diesel engine and the motor can be achieved at any speed, oil consumption is reduced, and power performance is improved.

The present disclosure generally relates to systems and methods utilizing regenerative agriculture for the procurement, production, refinement and / or transformation of low carbon intensity transportation fuels, including low carbon intensity biodiesel and / or renewable diesel, low carbon intensity biogasoline, low carbon intensity aviation, marine and kerosene fuels as well as fuel oil blends, low carbon intensity ethanol, and low carbon intensity hydrogen, that may be beneficially commercialized directly to consumers. In further aspects, the systems and methods of the present disclosure advantageously generate low carbon intensity comestibles, including sustainably-sourced meal and / or feed. The disclosed systems and methods may be utilized and optimized such that the resulting fuels and foodstuffs are characterized by a reduction in greenhouse gas production and a diminution in the fertilizer, pesticide and water required for producing the associated crop feedstocks.

The invention relates to the technical field of engines, in particular to a piston combustion chamber for a diesel and natural gas engine and the engine, and the piston combustion chamber for the diesel and natural gas engine comprises an omega-shaped pit. The straight opening type omega-shaped pit structure is adopted, compared with a traditional ignition type combustion chamber, the ineffective conical volume in the center of the combustion chamber is removed, the top dead center injection diffusion combustion mode is better met, the air utilization rate is higher, the compression ratio is higher, and higher heat efficiency can be better achieved; compared with a traditional necking omega-shaped diesel engine combustion chamber, a plurality of necking structures are removed, the first annular concave face and the second annular concave face are designed, the characteristic of natural gas injection is better met, the front end space of flames is fully released, the air utilization rate is increased, the heat transfer loss is reduced, and the combustion efficiency and the heat efficiency are improved; due to the design of the large-curvature concave surface, the problems of heat load concentration and particle friction caused by a sharp structure can be avoided, and the problems of out-of-control combustion, knocking and engine damage are reduced.

A process for improving yield of kerosene and / or diesel from a renewable feedstock involves hydrotreating a renewable feedstock and hydroisomerizing the hydrotreated liquid. The isomerized effluent is separated to produce an offgas stream, at least one fuel stream having a desired boiling point range, and a heavy fraction having a boiling point greater than the desired boiling point range. The heavy fraction is passed to a hydrocracking zone to produce a hydrocracked effluent. The hydro-cracked effluent is passed to the hydroisomerization zone.

The utility model discloses a filtering device and biomass diesel oil production oil-water separation equipment. The filtering device comprises a material box, a heating box, a filtering assembly and a cleaning assembly, a cover body is installed at the upper end of the material box, a heating box is fixedly arranged at the side end of the material box, a plurality of heating bins are arranged in the heating box, a liquid inlet pipe is arranged on one side of the bottom end of each heating bin, a liquid inlet valve is arranged in each liquid inlet pipe, the liquid inlet pipes extend into the material box, a liquid outlet pipe is arranged on the other side of the bottom end of each heating bin, and a liquid outlet valve is arranged in each liquid outlet pipe. The exhaust pipe is arranged at the upper end of the heating bin; the filtering assembly and the cleaning assembly are arranged in the material box; the biomass diesel oil is subjected to impurity removal and filtration by arranging the detachable bent plate in the material box, and meanwhile, impurities on the bent plate are scraped into the collecting box through the movably arranged scraping plate, so that the situation that the bent plate which realizes filtration and impurity removal is frequently taken out and cleaned is avoided, and the oil-water separation efficiency of the biomass diesel oil is improved.

The invention provides a methanol-diesel dual-fuel engine knock control method, relates to the technical field of engine control, and aims to implement multi-cylinder independent control, realize differentiated control of each cylinder, independently collect and filter knock sensor signals of each cylinder, and improve the reliability of the engine knock control. Extracting the detonation characteristic intensity of each cylinder by using a fast Fourier transform and time domain integral analysis method; judging which level of response strategy threshold range the knock characteristic intensity is located in, and executing a response strategy of a matching level; and establishing an adaptive learning mechanism, and optimizing the threshold value of each level of response strategy. The method has the advantages that the knocking detection accuracy is remarkably improved, the optimal control boundary under different methanol mixing proportions is achieved through a self-adaptive learning mechanism, the problem of inconsistency of cylinders under the dual-fuel working condition is solved by adopting a differentiated cylinder control strategy, the engine safety is guaranteed, and the reliability of the engine is improved. Torque output under the full-load working condition is improved, the failure rate of knock-related parts is reduced, the service life of an engine is prolonged, and pollutant emission is reduced.

The invention relates to the field of power and energy engineering, in particular to a methanol-diesel dual-fuel internal mixing type fuel injector capable of being independently controlled. In order to overcome the defects that in the prior art, a dual-fuel injection system is complex in structure, the size of an oil injector is large, a cylinder cover is difficult to install, the fuel premixing capacity is poor, and injection control is not flexible, the technical scheme is that the methanol-diesel oil dual-fuel internal mixing type oil injector capable of being independently controlled comprises an oil injector shell; the fuel injector shell is provided with a methanol fuel inlet, a diesel fuel inlet, a fuel injection hole as well as a methanol oil way and a diesel oil way which are respectively connected with the methanol fuel inlet and the diesel fuel inlet; a methanol control assembly, a diesel oil control assembly, a pressure control chamber, a ball valve, a needle valve and a premixing pressure cavity are arranged in the oil injector, injection of methanol and injection of diesel oil can be controlled respectively, and mixed injection of two kinds of fuel can be achieved in the premixing pressure cavity. The methanol-diesel oil dual-fuel efficient mixed injection system is suitable for modification work of an engine oil injection system needing to achieve methanol-diesel oil dual-fuel efficient mixed injection and precise control in the fields of ship power, heavy vehicles, engineering machinery and the like.

A system for managing emissions of a vehicle includes a controller to perform: activating a heater responsive to a battery state of charge being at or above a predefined threshold, activating an air mover, causing the moving air to be heated to heat an aftertreatment system, receiving an aftertreatment system temperature responsive to activating the air mover, causing the engine to operate in a modified power mode where a power output of the engine is below a power output threshold, responsive to the temperature being at or above a first threshold and below a second threshold, causing the engine to operate the engine in a normal operating mode where the power output of the engine is at or above the power output threshold, responsive to the temperature being at or above the second threshold, and deactivating the heater when the temperature is at or above the second threshold.

An apparatus for mitigating contamination in a fuel supply is an ultrasonic generator coupled with a piezoelectric transducer that propagates ultrasonic waves through a fuel tank. In some embodiments the apparatus is used to mitigate the growth of microbial organisms. In other embodiments the apparatus is used to emulsify water into the fuel, particularly in diesel fuel. The apparatus addresses water and microbial growth found in boats, cars, and aircraft as well as in storage tanks such as those used at fuel stations. In some embodiments, the fluid is diesel fuel.

The invention discloses a ship alcohol hydrogen electric drive power supply system. By integrating methanol reforming power generation, intelligent energy storage and digital management technologies, carbon emission is reduced by more than 30% while fuel cost is remarkably reduced by 45%-55%, millisecond-level response, 95% of system energy efficiency and full-process intelligent monitoring are achieved, the problems of high cost, high pollution and low efficiency of traditional diesel power generation are comprehensively solved, and the system is suitable for large-scale popularization and application. And meanwhile, stable operation in a low-temperature environment and off-grid power supply capability are realized, and remarkable breakthroughs are made in economic benefits, environmental protection performance and intelligent level.

The application provides an acid ester composite diesel anti-wear agent and a preparation method thereof, and belongs to the technical field of diesel additives, and comprises the following steps: S1, preparing a silanized solid acid catalyst; S2, preparing C18 polyol ester; S3, mixing an acid type anti-wear component and the C18 polyol ester, and then stirring after heating, and then adding tetrahydropyrazole pyridine derivatives and a diluent to continue stirring, and then cooling and filtering to obtain the acid ester composite diesel anti-wear agent. The application can improve the lubricity and anti-wear performance of low-sulfur diesel at a lower additive dosage, and has low corrosion and good oxidation stability.

The invention discloses a methanol-diesel dual-fuel in-cylinder direct injection engine performance optimization method, which comprises the following steps of: setting a geometric model of fuel combustion in an engine cylinder comprising a diesel nozzle and a methanol nozzle, performing grid division, and setting a sub-model required by simulation calculation; initializing a population, wherein each particle in the population is composed of a mass flow value of a diesel curve control point and a mass flow value of a methanol curve control point; generating a diesel curve and a methanol curve based on the starting point, the control point and the ending point; calculating engine power and total emission of population particles by simulation software based on a diesel curve and a methanol curve; performing weighted summation to serve as an optimization target of population particles; and iteratively updating the speed and the position of the population particles to the maximum iterative calculation step number, and obtaining an optimal diesel curve and an optimal methanol curve based on the optimal particles. According to the method, the fuel injection curves of the diesel oil and the methanol are optimized respectively, and the overall performance of the dual-fuel in-cylinder direct injection engine is improved.

The invention discloses a diesel additive and a preparation method thereof. The diesel oil additive comprises the following raw material components in percentage by mass: 1-5% of a function improver, 0.5-1% of an antioxidant, 0.1-0.3% of a dispersing agent and the balance of base oil. The invention also provides a preparation method of the diesel oil additive, and the diesel oil additive is prepared by mixing the raw material components. Compared with the prior art, the prepared diesel oil additive has the advantages of being good in anti-wear lubrication and low-temperature fluidity, small in additive amount, wide in adaptability, high in stability and the like, and the preparation method is easy and convenient to operate, low in cost and suitable for large-scale production.

The invention relates to a hydrogen-diesel oil dual-fuel single-cylinder engine heavy-load working condition combustion control system and method, belongs to the technical field of engines, and is characterized in that an air inlet pressure sensor is mounted near an air inlet valve, a control valve is mounted in an air inlet channel, an electric supercharger and an intercooler are connected to the other air inlet channel in series, and a temperature sensor is mounted; a pressure sensor, a hydrogen sprayer and an oil sprayer are installed in the combustion chamber, and the hydrogen sprayer, the oil sprayer, the electric supercharger, the control valve, the air inlet pressure sensor, the pressure sensor, the intercooler and the temperature sensor are connected with a vehicle-mounted computer at the same time. The control over the pressure rising rate and the pressure fluctuation of the hydrogen-diesel oil dual-fuel single-cylinder engine under the large-load working condition is achieved by adjusting the air inlet supercharging pressure and the fuel injection control strategy, and the problem of abnormal combustion under the large-load working condition is solved.

The invention relates to a multifunctional efficient SOFC power generation management method and system for an island, and relates to the technical field of power generation, and the method comprises the steps: heating diesel oil to volatilize the diesel oil into diesel oil steam, and collecting heating parameter information; generating suction control information according to the heating parameter information; based on the suction control information, controlling a preset micro-interface reformer to suck water vapor and diesel steam, and performing cracking reforming to generate mixed gas; collecting a temperature detection value and mixing condition information of the mixed gas; generating hot delivery control information according to the temperature detection value and the mixing condition information; and transmitting the mixed gas to a preset SOFC pile based on the heat transmission control information for power generation. The island power generation device has the effect of reducing air pollution generated during island power generation.

The invention provides a heavy oil cracking and separating process based on supercritical carbon dioxide cooperation, and relates to the technical field of industrial oil refining. Comprising the following steps: fully mixing heavy material oil with supercritical carbon dioxide, adding the mixture into a microwave reactor, and carrying out cracking reaction under the action of a microwave field to obtain a cracking mixture; placing the cracking mixture in a supercritical separator, enriching light cracking products in a supercritical carbon dioxide phase and precipitating heavy components and impurities in a heavy phase by controlling the temperature and pressure in the supercritical separator, and separating the supercritical carbon dioxide phase from the heavy phase; performing vacuum flash evaporation or low-temperature separation on the supercritical carbon dioxide phase to obtain a gasoline fraction, a diesel fraction and C1-C4 cracked gas; through a triple core mechanism, the yield and quality of light oil which are far higher than those of a coking technology are obtained at the cost far lower than that of a hydrogenation technology.

The invention discloses an optical storage diesel energy management system and method. The system comprises a photovoltaic power generation system, an energy storage system, a diesel power generation system, an alternating current bus, a load and an energy management controller. The photovoltaic power generation system, the energy storage system, the diesel power generation system and the load are all electrically connected with the alternating current bus, and the photovoltaic power generation system, the energy storage system and the diesel power generation system are all in communication connection with the energy management controller; and the energy management controller controls the operation states of the photovoltaic power generation system, the energy storage system and the diesel power generation system according to the photovoltaic power generation power of the photovoltaic power generation system, the total load power of the load, the energy storage charge state of the energy storage system and a priority control strategy. According to the invention, the photovoltaic power generation system is directly and electrically connected to the AC bus, so that the photovoltaic power loss can be avoided, the system operation efficiency is improved, and the real-time cooperative control of three paths of energy sources of the photovoltaic power generation system, the energy storage system and the diesel power generation system is realized through the photovoltaic power generation power, the total load power and the energy storage charge state.

The invention discloses an optical storage diesel micro-grid based on analog quantity control and a dynamic load tracking control method. The power grid comprises a photovoltaic power generation unit, a diesel power generation unit, an energy storage cluster, a sampling and signal processing module, an analog quantity control interface module and an energy management system. The energy management system is configured to control the energy storage cluster to perform discharge compensation under the condition that the power change rate is greater than a preset positive threshold value; under the condition that the power change rate is smaller than a preset negative threshold value, the energy storage cluster is controlled to carry out absorption charging; controlling the energy storage unit to correct the output power according to the deviation between the average charge state of the energy storage cluster and the charge state of the energy storage unit; and controlling the diesel power generation unit to stop when the total charge state of the energy storage cluster is greater than the first charge threshold percentage, and controlling the diesel power generation unit to start when the total charge state of the energy storage cluster is less than the second charge threshold percentage. Therefore, power fluctuation quick response, energy storage SOC balance and efficient starting and stopping of the diesel engine are achieved.

The present invention discloses a method, system, and storage medium for determining the physical and chemical indicators of diesel fuel based on Raman spectroscopy. The method comprises: iteratively training an original XGBoost model for predicting the physical and chemical indicators of diesel fuel based on the measured physical and chemical indicator values ​​of each diesel fuel sample and a plurality of first Raman spectral data corresponding to each diesel fuel sample to obtain a target XGBoost model; and inputting a plurality of target Raman spectral data of the diesel fuel to be tested into the target XGBoost model to obtain predicted physical and chemical indicator values ​​of the diesel fuel to be tested. Compared with other models for determining the physical and chemical indicators of diesel fuel using Raman spectroscopy, the present invention improves the accuracy of determining the physical and chemical indicators of diesel fuel; and, compared with national standard detection methods, not only can non-destructive determination be performed, but also the speed of determining the physical and chemical indicators of diesel fuel is increased.

The invention discloses a continuous production process for preparing special asphalt by a co-carbonization method, which comprises the following steps: by taking petroleum slurry and coal pitch as basic raw materials, adding an initiator to form a co-carbonization raw material, preheating the raw material by a heating furnace, feeding the preheated raw material into a reaction tower, and carrying out co-carbonization reaction at specific temperature and pressure in a mixed gas atmosphere to obtain the special asphalt. Special asphalt generated by the reaction is distilled out from the bottom of the reaction tower, gasoline, diesel oil and normal-pressure residual oil are separated from light components distilled out from the tower top through normal-pressure distillation, and then wax oil and heavy oil are further separated from the normal-pressure residual oil through reduced-pressure distillation. The process is not only suitable for producing impregnated asphalt, asphalt binder and coated asphalt required by lithium ion battery graphite negative electrode materials, and realizes industrial continuous preparation of special asphalt, but also all performances of the product meet index requirements. Meanwhile, by-products such as gasoline, diesel oil, wax oil and heavy oil are synchronously and efficiently separated and recovered, and the recovery rate of the by-products reaches 100%. The reaction conditions are mild, and the production efficiency and the resource utilization rate are remarkably improved.

The invention relates to the technical field of aviation fuel preparation, in particular to a method for preparing aviation fuel through carbon dioxide hydrogenation, which comprises the following steps: (1) introducing carbon dioxide and hydrogen raw materials into a fixed bed reactor A filled with a solid catalyst a for reaction; (2) introducing a product of the reactor A into a three-phase separator to separate and remove gas and water, and introducing the residual liquid phase into a condensation crystallizer to perform dewaxing operation; (3) introducing the dewaxed oil phase into a hydroisomerization reactor B filled with a solid catalyst b for reaction; and (4) introducing the liquid effluent in the reactor B into a normal-pressure rectifying tower for separation to obtain a light fraction, an aviation fuel component, a low-condensation-point diesel fraction and a high-condensation-point diesel fraction, and according to the method for preparing the aviation fuel through carbon dioxide hydrogenation, the CO2 hydrogenation catalyst is simple to prepare and long in service life, and the investment is greatly reduced.

A hybrid fuel cell vehicle (10), comprising a vehicle body (100), a chassis (120), and an accommodating unit (110) located above the chassis (120); a vehicle-mounted power system (122), which is arranged on the chassis (120) and is used for providing kinetic energy to the hybrid fuel cell vehicle (10); an emergency power supply apparatus (126), which is arranged on the chassis (120) and is used for outputting power outward; a fuel cell module (124), which is arranged on the chassis (120) and is used for outputting power to the vehicle-mounted power system (122) and the emergency power supply apparatus (126); a hydrogen production module (112), which is arranged on the accommodating unit (110) and is used for providing hydrogen to the fuel cell module (124); and a storage box (114), which is arranged on the accommodating unit (110) and is used for storing a raw material for hydrogen production and providing the raw material for hydrogen to the hydrogen production module (112). By means of such arrangement, it is not necessary to additionally replenish other fossil fuels such as gasoline and diesel oil, and the hybrid fuel cell vehicle has flexibility in use and is applicable to different scenarios, thus reducing the costs of additionally purchasing different apparatuses.

The invention discloses a biodiesel filtering system and method and a mining excavator, and the system comprises a filling pipeline which is connected between a refueling vehicle and a vehicle oil tank, and is provided with a diesel coarse filter; the filtering pipeline comprises a first pipeline and a second pipeline, the first pipeline is connected between a vehicle oil tank and an engine, an oil-water separator, a fuel oil primary refined filter, a fuel oil water-containing sensor and a three-way electromagnetic valve are sequentially installed on the first pipeline, the second pipeline is connected between the three-way electromagnetic valve and the engine in parallel, and a fuel oil secondary refined filter is installed on the second pipeline; the oil-water separator comprises a fuel lift pump, a water level sensor and a water discharge electromagnetic valve; and the vehicle control unit is respectively connected with the water level sensor, the water discharge electromagnetic valve, the fuel oil water content sensor, the three-way electromagnetic valve and the instrument. According to the invention, real-time and accurate detection of the water content of the biodiesel is realized, the filtering level of refined filtration of the biodiesel can be adjusted in time, and the quality of the biodiesel entering an engine is accurately controlled.

A diesel fuel composition including (a) a quaternary ammonium salt additive; and (b) one or more nitrogen-free detergents; wherein the quaternary ammonium salt additive includes the quaternised reaction product of a hydrocarbyl substituted succinic acid derived acylating agent and a compound able to react with said acylating agent and which includes a tertiary amine group; wherein each molecule of the hydrocarbyl substituted succinic acid derived acylating agent includes on average at least 1.2 succinic acid moieties.

The invention discloses a method for producing marine fuel oil. The method comprises the following steps: a residual oil raw material and hydrogen sequentially enter a first hydrotreating reactor to an (N-1)-th hydrotreating reactor for reaction, an obtained product, solid-removed oil slurry and optional catalytic diesel oil enter an Nth hydrotreating reactor to be in contact with a hydrogenation catalyst for reaction, and hydrogenated diesel oil and hydrogenated heavy oil are obtained, wherein a portion of the hydrogenated diesel oil is used as a first hydrotreating reactor feed; one part of the hydrogenated heavy oil enters a catalytic cracking unit for reaction to obtain catalytic diesel oil and catalytic slurry oil; and blending the obtained hydrogenated heavy oil with optional solid-removed oil slurry, optional catalytic diesel oil and optional hydrogenated diesel oil to prepare the marine fuel oil. According to the method disclosed by the invention, high-quality ship fuel which is low in cost and can meet indexes can be produced, and the problems that the overall utilization efficiency of a catalyst is low and the operation period of a device is restricted due to the fact that solid-removed oil slurry, catalytic diesel oil and the like are conventionally mixed at the inlet of the first reactor can be solved.