61 results about "Fuel type" patented technology

The invention discloses a marine fuel leakage assessment method, device and equipment, a medium and a product. The method comprises the following steps: acquiring leakage scene information related to marine fuel leakage, wherein the leakage scene information at least comprises personnel position information, ship environment information, leakage state information and fuel type information; based on the leakage scene information, determining first distribution data of leakage concentration and leakage related positions by calling a preset simulation model realized based on computational fluid dynamics or calling a historical leakage simulation result in a database, and second distribution data of leakage concentration and leakage time at a position indicated by the personnel position information; and according to the first distribution data and the second distribution data, visually displaying a leakage concentration contour map marked with the personnel position information, a leakage concentration time change map and personnel escape suggestion information. According to the scheme, the actual threat degree of leakage to personnel on the ship can be reflected, and suggestions for dealing with leakage are provided.

The utility model provides an active pre-combustion chamber supply system, an engine assembly and a vehicle, and relates to the technical field of vehicle parts. The active pre-combustion chamber supply system comprises a plurality of storage units used for storing different fuels, each storage unit communicates with a fuel inlet of an active pre-combustion chamber, and connection and disconnection of a communicating pipeline between each storage unit and the fuel inlet are controlled through a valve. A plurality of storage units are arranged in an active pre-combustion chamber supply system, each storage unit is communicated with a fuel inlet of an active pre-combustion chamber, and meanwhile, a valve is used for performing on-off control on a communicating pipeline, so that a set of flexible supply system capable of switching fuel types is successfully constructed.

The invention discloses a hybrid power parameter determination method and device and electronic equipment, and relates to the field of vehicle design, and the method comprises the steps: determining the engine displacement of which the average operation power of an engine is consistent with a target fuel consumption area according to the average operation power, the torque standard deviation, the maximum torque fluctuation value and the fuel type in a vehicle road spectrum; according to the method, the determined engine can work in the interval with higher efficiency, the fuel economy is improved while the conventional power requirement is met, and the engine cost is reduced. The rated power of the motor is further determined according to the maximum operation power in the vehicle road spectrum and the target engine external power, and the target engine external power is the external power corresponding to the target vehicle speed or the target rotating speed under the maximum operation power. And determining the battery capacity according to the rated power of the motor, the climbing duration in the vehicle road spectrum and the battery adjustment coefficient. And on the basis of the engine, motor driving is matched to increase the endurance mileage, and the economy of the whole vehicle is improved.

The invention particularly relates to a control method applying an unmanned aerial vehicle and based on multi-modal characteristics of a fire source, and relates to the technical field of fire safety. Acquiring multi-modal data of a fire source in real time; comprehensively estimating the heat power of the fire source; correcting combustion intensity; and quantitative calculation of fire extinguishing agent demand. An infrared imaging sensor, a visible light camera and a gas sensor array are integrated, a multi-mode fire source sensing system is constructed, the sensing limitation that a traditional fire extinguishing system only depends on single temperature or image is broken through, fire source temperature distribution, flame forms and combustion gas concentration changes can be comprehensively captured, and complete data support is provided for fire behavior judgment; the thermal power of a fire source is estimated in a fusion manner, a fuel type is combined to calibrate a correction coefficient, a differential quantitative calculation model is established according to liquid and solid fire extinguishing agents, fire disasters of different fuels such as wood, gasoline and plastic are adapted, and economy and fire extinguishing reliability are both considered.

The invention relates to the technical field of boiler combustion control, in particular to a boiler intelligent combustion precise air distribution online monitoring system which comprises a combustion state sensing module, a combustion state sensing module, an execution adjusting module, an online monitoring feedback module and a data storage and visualization module. According to the boiler intelligent combustion precise air distribution online monitoring system, through fusion of multi-dimensional combustion state perception and a deep learning algorithm, intelligent self-adaptive optimization of an air distribution scheme is achieved, a traditional manual experience adjustment and single parameter control mode is abandoned, and the intelligent combustion precise air distribution online monitoring system is high in practicability. Key information in the combustion process is comprehensively captured by multiple types of sensors such as infrared thermal imaging and flue gas analysis, air volume, air speed and air temperature adjusting instructions of primary air, secondary air and tertiary air are accurately output through data preprocessing and fusion model operation, and complex working conditions such as fuel type change and load fluctuation can be dynamically adapted; real-time decision making and regulation can be completed without manual intervention, and the intelligent level of boiler combustion control is improved.

The invention discloses a multi-fuel generator set control system, a control method thereof and a generator set, which are applied to the technical field of generator sets, the multi-fuel generator set control system comprises a multi-fuel generator set and a control system, the control system comprises a fuel change-over switch, an engine starting switch, a carburetor, a fuel gas supply electric control valve, a signal detection module, an ignition device and a control device; a gas fuel supply pipeline of the multi-fuel engine is connected with a gas inlet of the gas supply electric control valve, and a gas outlet of the gas supply electric control valve is connected with a gas fuel inlet of the carburetor. And the signal input end of the fuel type detection circuit is connected with the fuel change-over switch. The temperature sensor is used for detecting a cylinder body temperature signal of the fuel engine and compensating the injection amount of the gas fuel according to the cylinder body temperature signal of the engine. The temperature sensor is used for monitoring the temperature of the cylinder body of the engine in real time, the injection amount of the gas fuel is compensated according to the temperature of the cylinder body of the engine, and the combustion condition in the engine heating process of the engine is stabilized.

The invention relates to the technical field of industrial process automatic control, and discloses a decomposing furnace temperature discrete variable integrated control method based on a BP-ARX model. Comprising the following steps: collecting current of a shredder, outlet temperature of a decomposing furnace, coal feeding quantity of the decomposing furnace, alternative fuel feeding quantity, raw material feeding quantity, oxygen content at the tail of the kiln, start-stop state, alarm state, control enable signal and fuel type code; performing abnormal value elimination, missing measurement value complementation, 60 s window filtering and 600 s window filtering on the current of the shredder; generating a basic coal feeding amount compensation value based on dual-threshold triggering and dual-stage integration; constructing a BP-ARX model with combined input of discrete variables and continuous variables to output a model correction compensation value, superposing the model correction compensation value with basic compensation, forming a final coal feeding amount compensation value through upper and lower limits and difference amplitude limiting, and issuing the final coal feeding amount compensation value; and switching model parameter groups according to fuel type codes, and executing online updating, backup control and output recovery according to the temperature deviation. The method is used for improving the temperature control stability and co-combustion working condition adaptability of the decomposing furnace.

The invention relates to the field of aluminum melting furnace energy-saving control, and discloses an energy-saving control method and system for a heat accumulating type aluminum melting furnace, and the method comprises the steps: carrying out the clustering of a plurality of historical operation data, obtaining a plurality of typical operation conditions of the heat accumulating type aluminum melting furnace, and each typical operation condition comprises a plurality of historical operation data; determining an air preheating correction coefficient according to a plurality of historical operation data of the typical operation condition; acquiring current operation data of the heat accumulating type aluminum melting furnace; determining a target typical operation condition to which the current operation data belongs, and obtaining a target air preheating correction coefficient corresponding to the target typical operation condition; the current air preheating temperature, the fuel type and the fuel flow are obtained; determining a target air-fuel ratio according to the fuel type; according to the fuel flow and the target air-fuel ratio, the basic air flow is determined; and the product of the basic air flow and the target air preheating correction coefficient is determined to serve as the corrected air flow. According to the invention, the production requirements of high efficiency and energy conservation under different working conditions can be met.

The invention discloses a self-adaptive control method for a low-carbon multi-fuel internal combustion engine based on fuel activity online identification, which comprises the following steps of: acquiring a pressure signal in a cylinder and a crank angle signal, calculating an instantaneous apparent heat release rate, and extracting waveform topological characteristics of the heat release rate; inputting the extracted heat release rate waveform topological features into the trained fuel activity mapping model to obtain an equivalent reaction activity index of the current mixed fuel; based on the equivalent reaction activity index, dynamically interpolating in a map database or switching to a corresponding reference control strategy, determining a basic value of a control parameter under the current working condition, and performing closed-loop increment correction on the control parameter based on the deviation between the current combustion parameter and a target parameter to obtain a correction value, and performing one-cycle control by taking the sum of the basic value and the correction value as a final value of the control parameter. The invention further discloses a corresponding control system. The combustion stability of the internal combustion engine under the multi-fuel variable working condition can be ensured without knowing the specific fuel type.

An aircraft propulsion system includes a compressor section, a combustor section, and a fuel system assembly. The compressor section includes a plurality of inlet guide vanes, an inlet guide vane actuator (IGVA), and an IGVA servo. The IGVA is operably coupled with the plurality of inlet guide vanes. The IGVA servo is connected in fluid communication with the IGVA. The combustor section includes a combustor. The fuel system assembly includes a jet fuel system and a hydrogen fuel system. The jet fuel system is connected in fluid communication with the combustor. The hydrogen fuel system is connected in fluid communication with the combustor and the IGVA servo. The hydrogen fuel system is configured to direct the hydrogen fuel to the IGVA servo to control a position of the IGVA.

The invention provides an anti-corrosion system for tail equipment of a thermal power peak regulation unit, which relates to the technical field of thermal power generation and comprises a fuel and denitration control module, an equipment body anti-corrosion strengthening module, an operation parameter dynamic adjustment module, a smoke temperature dynamic regulation and control module and cooperative control logic for realizing cooperative operation of the modules through a DCS (Distributed Control System). The modular design concept and the whole-process prevention and control logic of the system are not strictly limited by unit capacity and fuel types, the system is not only suitable for various coal-fired thermal power peak regulation units, but also can be popularized to the peak regulation units with similar low-temperature corrosion and blockage problems such as biomass coupling power generation, and the system is wide in application scene and has important industry popularization value.

The application relates to the field of energy-saving control of aluminum melting furnaces, and discloses an energy-saving control method and system for a regenerative aluminum melting furnace, which comprises the following steps: clustering a plurality of historical operation data to obtain a plurality of typical operation conditions of the regenerative aluminum melting furnace, each typical operation condition comprising a plurality of historical operation data; determining an air preheating correction coefficient according to the plurality of historical operation data of the typical operation condition; obtaining current operation data of the regenerative aluminum melting furnace; determining a target typical operation condition to which the current operation data belongs, obtaining a target air preheating correction coefficient corresponding to the target typical operation condition; obtaining a current air preheating temperature, a fuel type and a fuel flow; determining a target air-fuel ratio according to the fuel type; determining a basic air flow according to the fuel flow and the target air-fuel ratio; and determining the product of the basic air flow and the target air preheating correction coefficient as a corrected air flow. The application can meet the production demand of high efficiency and energy saving under different conditions.

The invention discloses a range extender control method and device, a control system and a vehicle. The operation mode and the battery capacity of a range extender are obtained; determining a power generation grade according to the operation mode and the battery electric quantity; determining power generation power according to the fuel type, the power generation level and the vehicle speed, and controlling a range extender to generate power according to the power generation power; the generated power is in positive correlation with the power generation level. According to the method, the power generation level is determined through the operation mode and the battery electric quantity, charging and discharging management of the battery is more reasonable, the power generation power is determined through the fuel type, the power generation level and the vehicle speed, it is guaranteed that the power generation power is matched with the current working condition, and the problem that efficiency is low when a dual-fuel range extending system only adopts single rotating speed control is solved; when the vehicle is in different working conditions, different power generation powers can be determined, it is guaranteed that the vehicle has enough power under the different working conditions, and meanwhile the energy utilization rate is increased.

Systems, apparatuses, methods, and computer program products are disclosed for autonomously deriving consumption of fuel. An example method includes receiving a transaction request and determining a fuel pump location associated with a fuel pump identifier. The example method further includes determining a current price of a fuel type at the fuel pump terminal based on the fuel pump location and deriving a total fuel redemption volume based on the current price of the fuel type. The example method further includes updating a fuel availability data structure associated with a user account.

An aircraft propulsion system includes a combustor, an engine oil system, and a fuel system assembly. The engine oil system includes a fuel-oil heat exchanger. The fuel system assembly includes a jet fuel system, a hydrogen fuel system, and a switching valve. The jet fuel system and the hydrogen fuel system are connected in fluid communication with the combustor. The jet fuel system is selectively connected in fluid communication with the fuel-oil heat exchanger by the switching valve. The hydrogen fuel system is selectively connected in fluid communication with the fuel-oil heat exchanger by the switching valve. The switching valve is configurable between a first circuit flow path and a second circuit flow path. The switching valve configured in the first circuit flow path directs the jet fuel through the fuel-oil heat exchanger. The switching valve configured in the second circuit flow path directs the gaseous hydrogen fuel through the fuel-oil heat exchanger.

The invention provides a flexible resource planning method, device and equipment and a storage medium, and the method comprises the steps: obtaining the unit grade, fuel type and operation state parameter of a thermal power unit from a power system, and calculating dynamic carbon emission data to quantify the real-time carbon emission; and acquiring data of an energy storage device and the like, calculating short-time flexibility probability distribution, and determining a system flexibility supply risk level. And finally, through iterative feedback of a bilevel programming model, inputting dynamic carbon emission data into a lower-layer operation simulation module, adjusting a flexibility threshold value, generating system flexibility supply probability distribution, and outputting a system operation point by the lower layer and feeding the system operation point back to the upper layer to correct a flexibility constraint. According to the method, collaborative optimization of multi-type flexible resources is realized, short-time and long-time supply and demand are effectively balanced, and the stability, economy and low-carbon operation capability of a power system are improved.

The invention discloses an air inlet heating system for low-temperature starting of an engine and a control method thereof and belongs to the technical field of internal combustion engines. The heater comprises an intake manifold, a pressure stabilizing cavity is formed in the intake manifold, the whole heater is installed between an inlet flange and a throttle valve of the intake manifold through a flange connecting face, a heating rod of the heater penetrates through the flange connecting face and extends into the pressure stabilizing cavity, and the joint of the heating rod and the inner wall of the flange connecting face is fixed through a variable-diameter structure. An included angle of 4-6 degrees is formed between the central axis of the heating rod and the normal of the flange connecting face, a temperature and pressure integrated sensor is arranged on the intake manifold and used for monitoring the temperature and pressure in the pressure stabilizing cavity, and the temperature and pressure integrated sensor, the heater and the throttle valve are all electrically connected with an electronic control unit. The device is firm in structure and uniform in heating, fuel types can be intelligently recognized, rapid and accurate temperature control is achieved, and conditions can be actively optimized when starting is difficult.

The invention discloses a dynamic carbon emission prediction method considering a power generation side and a system thereof. The system monitors the operation data of the generator set in real time, and constructs and optimizes a carbon emission prediction model by using a machine learning technology, so as to improve the prediction accuracy and response speed. The method comprises the steps of data acquisition and preprocessing, model construction and training, establishment of a feedback and optimization mechanism and continuous monitoring of a prediction result. The system integrates a support vector machine or a random forest algorithm, differentiated carbon emission model training is carried out, and it is ensured that the system adapts to characteristics and fuel types of different generator sets. By setting a feedback mechanism and an automatic anomaly detection function, the system can dynamically adjust model parameters, optimize feature selection and realize accurate management of carbon emission. The invention provides an effective technical means, and the purposes of low-carbon operation and sustainable development are achieved while the power system is supported to meet the requirements.

The invention relates to the field of scientific research of forest fire, forest and town junction fire and building fire, and discloses a systematic experimental device and method integrating the whole process of formation, transportation and ignition of flying fire particles. The device comprises a multifunctional wind tunnel system, a fuel fixing system, a multi-parameter measuring system and a water disc and igniter system, a controllable uniform wind field is constructed to adapt to various fuel types, and simulation and data acquisition of the whole process of flying fire particles from formation, transportation to ignition of combustible materials are achieved. The invention further provides an experimental method based on the device, the experimental method can be suitable for various working conditions such as natural convection and forced convection, parameters such as the air speed and the fuel water content are accurately regulated and controlled, key data such as the particle size, the mass, the temperature field and the heat flow intensity are synchronously collected, and a reliable experimental platform is provided for research of a flying fire particle forming mechanism and transportation and ignition rules.

An aircraft propulsion system includes a combustor section, an engine oil system, and a fuel system. The combustor section includes a combustor forming a first portion of a core flow path through the aircraft propulsion system. The engine oil system includes a fuel-oil heat exchanger. The fuel system assembly includes a jet fuel system and a hydrogen fuel system. The jet fuel system is connected in fluid communication with the combustor and configured to selectively direct a jet fuel to the combustor. The hydrogen fuel system is connected in fluid communication with the combustor and configured to selectively direct a hydrogen fuel to the combustor. The hydrogen fuel system is further connected in fluid communication with the fuel-oil heat exchanger.

The application provides a multi-mode adaptive flame detection system and method, and relates to the technical field of flame detection. The system comprises a sensing module for collecting ultraviolet light signals and infrared light signals in a flame signal, which are denoted as flame detection signals; a signal processing module for performing flame identification according to the flame detection signals and determining the type of the flame; a mode selection module for selecting a flame detection algorithm matched with the type of the flame according to the type of the flame, and detecting the flame; and a cooling module for cooling the sensing module. The application can identify the type of fuel in real time according to the characteristics of the flame signal, and can adapt to different fuels such as gas, light oil, coal powder or biomass particles without manual replacement of hardware, so that reliable monitoring of multi-fuel combustion can be realized by a single detection system.

The invention discloses an on-line monitoring method for carbon emission data, which comprises the following steps: deploying an NDIR infrared sensor, a TDLAS laser spectrometer and a thermal infrared imager at an emission port, and synchronously acquiring the concentration of carbon dioxide; calculating a real-time concentration difference value between the NDIR and the TDLAS, and if the difference value exceeds a threshold value, triggering the thermal imager to scan the temperature field; calculating a temperature standard deviation through a temperature distribution diagram scanned by the thermal imager, calculating a concentration measurement error according to the temperature standard deviation, and compensating the measurement error to obtain a real concentration; identifying a fuel characteristic peak through the pre-trained CNN; calculating the carbon emission contribution of each fuel according to the characteristic peak intensity proportion; and according to the carbon emission contribution amount of each fuel and in combination with a carbon emission threshold value, the input oxygen concentration, the fuel type and the feeding amount are automatically adjusted. The flow field interference is eliminated through the triangular array layout, and the carbon emission monitoring error under the high-temperature working condition is greatly reduced in combination with secondary calibration; based on CNN spectrum fingerprint identification and a weight coefficient calibration method, various energy co-combustion contribution degrees are accurately separated, and traceability errors are reduced.

The invention relates to the technical field of dual-fuel generator set control, and discloses a dual-fuel generator set starting control system and method, and the method comprises the steps: selecting a to-be-used fuel type channel, and triggering and executing a corresponding starting program; the flameout switch is arranged at a flameout gear, the hand-pulling start controls the choke valve to reset, and the hand-pulling start frequency is reset; the flameout switch is arranged at an automatic gear, hand-pulling starting is started, and a choke valve is controlled to the corresponding opening degree based on different fuel type passages according to a hand-pulling starting control table; if the hand-pulling starting is successful, the subsequent choke valve opening degree is controlled according to the corresponding fuel type of the electric starting control table until the choke valve is fully opened, and the dual-fuel generator set is successfully started; if not, executing the next hand-pulling start; and executing a corresponding process according to comparison of the threshold values of the number of times of hand-pulling starting until the dual-fuel generator set is successfully started. The method focuses on optimization design of a non-electric hand-pull starting control strategy suitable for fuel oil and fuel gas of the dual-fuel generator set, and the starting success rate of the set is improved in multiple scenes.

The present invention concerns a triacetin-based bioadditive composition for mineral diesel fuel, diesel–biodiesel blends, and pure biodiesel or B100. The bioadditive composition comprises triacetin as the sole bioadditive component in the range of 5–10% v / v by volume of the fuel. Triacetin is added directly to the fuel at ambient temperature and mixed to obtain a homogeneous fuel–bioadditive composition without the need for catalysts, additional chemical reactions, heating at elevated temperatures, or further refining processes. The resulting composition has a kinematic viscosity that remains within the specification range of each fuel and a sediment content of less than 0.01% m / m after storage for up to 30 days at 15–30°C.The effect of triacetin addition on density, acid number, oxidative stability, cetane number or cetane index, flash point, pour point, and cloud point depends on the type of fuel and the triacetin concentration used. The uniqueness of the present invention lies in the use of triacetin as a single bioadditive component in concentrations tested to produce a homogeneous composition, maintain flow characteristics within the specification range, and limit sediment formation during storage.

The invention discloses a cement kiln substitute fossil fuel CO2 reduction model and a dynamic optimization method, and the method comprises the steps: calculating the CO2 emission in a combustion stage when all fossil fuel participates in combustion, calculating the total CO2 emission of corresponding fuel after the fossil fuel is substituted in the combustion stage, determining the CO2 emission reduction in the combustion stage after the fossil fuel is substituted in the cement kiln, and determining the CO2 emission reduction in the combustion stage after the fossil fuel is substituted in the cement kiln. The carbon reduction amount is dynamically corrected by introducing the power generation amount change of waste heat power generation before and after fuel replacement, and a basic CO2 reduction model is established; the comprehensive cost is minimized by adjusting fuel types and substitution proportions, and an environment-friendly-economic dynamic optimization model is established; the model design logic is rigorous, it is ensured that the emission reduction result has traceability and authority, the application scene is clear, the method can be directly integrated to an existing cement kiln production line, the original production scale and core technology do not need to be changed, the technical transformation threshold of an enterprise is lowered, and the method has remarkable engineering popularization value.

The invention discloses colored new energy fuel oil based on color master batch compounding and a preparation method thereof, relates to the technical field of preparation of colored new energy fuel oil, and aims to solve the technical problems of safety and health risks, equipment failure and resource waste caused by confusion and misuse which are easily caused by color homogenization of current commercial fuel. The multi-color fuel oil of red, green, blue, purple and the like is prepared through a compounding process of the color master batch, the basic fuel oil and the combustion improver, the color is bright and stable, the fuel oil can be visually distinguished from edible oil, traditional diesel oil, gasoline and the like, the fuel type can be rapidly identified in the links of storage, transportation, filling and the like, and the fuel efficiency is improved. Equipment damage, resource waste and safety accidents caused by misuse are effectively avoided, and the problems of safety and health risks, equipment faults and resource waste caused by confusion and misuse which are easily caused by color homogenization of current commercial fuel are solved.

The application discloses a kind of source and process collaborative control's iron ore pellet chain grate-kiln NOx emission reduction method, first, the influence law of baking temperature and baking time on finished product pellet compressive strength is obtained by test, the relationship between baking temperature and time and finished product pellet compressive strength is established;Second, the rotary kiln numerical simulation model is constructed, obtains the thermal type NOx data under different rotary kiln outlet temperature, establishes the relationship between thermal type NOx generation and rotary kiln outlet temperature, and determines the preferred target outlet temperature in combination with finished product pellet compressive strength constraint;Finally, under the condition of preferred target temperature, with the proportion of pulverized coal heating as control variable, compare the fuel cost and fuel type NOx generation under different fuel structure, determine the recommended operation scheme.The application does not need to change the existing main process structure, effectively reduces NOx generation under the premise of guaranteeing the stability of pellet production quality and takes into account fuel cost.

The utility model discloses fuel oil type collective food reheating equipment in the technical field of reheating equipment. The fuel oil type collective food reheating equipment is composed of a cooking system, an oil supply system, a combustion system and a control system. The cooking system consists of a heating box body, a box cover, a food shelf and a box body bracket; the heating box body comprises an outer box body and an inner box body; the combustion system is composed of a frame assembly, an air pump, an atomization assembly, an ignition assembly and a combustion cylinder assembly. The oil supply system is composed of an oil tank, an oil supply pipeline, an oil-gas mixing valve and an oil level sensor. The control system is composed of a control circuit board, an operation button, a fan and a power connector. According to the food processing device, B-type food can be conveniently, stably and fully heated, the food can be well eaten, and the taste is improved.

This invention discloses a vehicle idling control method, device, equipment, and storage medium. The vehicle engine is compatible with multiple fuels. The method includes: if the vehicle enters an idling state, determining whether the engine's current fuel has changed; if so, determining the corresponding idling control parameters based on the current fuel type; determining the idling control torque based on the idling control parameters and a preset idling value; and controlling the engine to idle based on the idling control torque. In this embodiment, when the vehicle enters an idling state, the invention determines the corresponding idling control parameters based on the engine's fuel type, and determines the idling control torque based on the idling control parameters and a preset idling value to control the engine's idling operation. This allows for idling control of the engine using idling control parameters corresponding to the type of fuel used, improving the accuracy of idling control and thus enhancing vehicle stability.

An aircraft propulsion system includes a combustor, an engine oil system, and a fuel system assembly. The engine oil system includes a fuel-oil heat exchanger. The fuel system assembly includes a jet fuel system, a hydrogen fuel system, and a switching valve. The jet fuel system and the hydrogen fuel system are connected in fluid communication with the combustor. The jet fuel system is selectively connected in fluid communication with the fuel-oil heat exchanger by the switching valve. The hydrogen fuel system is selectively connected in fluid communication with the fuel-oil heat exchanger by the switching valve. The switching valve is configurable between a first circuit flow path and a second circuit flow path. The switching valve configured in the first circuit flow path directs the jet fuel through the fuel-oil heat exchanger. The switching valve configured in the second circuit flow path directs the gaseous hydrogen fuel through the fuel-oil heat exchanger.