11158 results about "Combustion chamber" patented technology

To provide a bi-fuel vehicle capable of preventing a driver from feeling bothered even in a situation where restart occurs frequently.SOLUTION: A bi-fuel vehicle is equipped with an engine 2 to which one of two types of fuel: CNG, which is gaseous fuel; and gasoline, which is liquid fuel, selected and supplied as fuel to be injected into a combustion chamber of each cylinder, and comprises an ECU 8 that controls an idling stop function that stops the engine 2 when a preset automatic stop condition is established and restarts the engine 2 when the preset restart condition is established. The ECU 8 selects gasoline as the fuel to be injected into the combustion chamber of each cylinder of the engine 2 when it is predicted that automatic stopping and restarting of the engine 2 may be repeated a predetermined number of times or more within a predetermined time.SELECTED DRAWING: Figure 1

The invention relates to the field of liquid air energy storage, and discloses a liquid air energy storage and liquefied natural gas coupling efficient power generation device and method. The method comprises the steps that an air liquefaction circulation loop purifies, compresses and cools ambient air and then expands and decompresses the ambient air to obtain liquid air, and the liquid air is transmitted to an air power generation circulation loop; generated air compression heat is stored in the heat storage unit; the air power generation circulation loop generates power through expansion of received liquid air, and generated cold energy is stored in a cold storage unit; the LNG vaporization supply loop pressurizes, evaporates and gasifies liquefied natural gas and then supplies the liquefied natural gas to a user side, generated cold energy is stored in a cold storage unit or directly supplied to the air liquefaction circulation loop, and meanwhile gaseous natural gas naturally released by an LNG tank is collected and conveyed to a combustion chamber. The high-grade heat energy utilization loop conducts heat conduction oil circulation, low-grade heat energy and high-grade natural gas combustion heat energy of the heat storage unit are recycled in sequence, high-grade heat energy is transmitted to the air power generation circulation loop, and heat conduction oil returns to the initial state to continue circulation after releasing the heat energy.

An automatic smoker, which ignites a combustion medium placed in a combustion chamber by means of an automatic igniter. An ignition needle of the automatic igniter is positioned inside an air inlet port and extends into the combustion chamber, placing the ignition needle at an upwind position. When the ignition needle performs the ignition operation, air enters the combustion chamber through the air inlet hole, promoting the combustion of the combustion medium, thereby enabling the automatic igniter to ignite the combustion medium within the combustion chamber more easily and quickly.

The invention discloses a small waste incineration full-automatic control system and method, and particularly relates to the technical field of solid waste treatment.The method comprises the following steps that waste throwing is recognized through infrared induction, a preheating device is started to heat a combustion chamber, and the heating intensity is adjusted in real time; when the temperature reaches a preset threshold value, the air volume, the feeding time and the combustion time are controlled according to the garbage type, and stable combustion is achieved; the concentration of carbon monoxide, nitric oxide and particulate matter in tail gas is monitored in the whole process, and combustion parameters are automatically adjusted when the emission limit value is close; after combustion is finished, slag is automatically discharged according to the amount of slag; meanwhile, temperature and emission data are collected and uploaded to a remote terminal, and full-process intelligent control and environment-friendly management are achieved; the whole-process automatic control is realized, and the manual dependence is reduced; combustion efficiency and adaptability are improved through an intelligent model; an emission prediction and feedback mechanism is introduced to ensure that the tail gas is environmentally friendly and reaches the standard, and the system stability and the intelligent level are enhanced.

The invention relates to a combustion chamber flame tube and a cooling hole distribution optimization method thereof. The combustion chamber flame tube comprises the first tube wall and the second tube wall, the cooling hole with the large first included angle is formed in the high-heat-load area, so that the large included angle is formed between the flowing direction of cooling air introduced by the cooling hole and the main flow direction, the cooling air is not prone to converging into the main flow, and the cooling air can be better attached to the wall face of the high-heat-load area; and a cooling air film with a large contact area with the inner wall of the barrel is formed, and the risk of local high-temperature ablation caused by insufficient cooling of a high-heat load area is reduced. The cooling holes with the small first included angle are adopted in the low-heat-load area, so that the included angle between the flowing direction of cooling air introduced by the cooling holes and the main flow direction is small, the cooling air is better converged with the main flow, the low-heat-load area is prevented from being overcooled, the temperature distribution of the inner wall of the flame tube is uniform, and the service life of the flame tube is prolonged. The problems of thermal fatigue and the like caused by overlarge temperature gradient are solved, and the risk of failure of the flame tube is reduced.

The invention belongs to the field of aero-engines, relates to an engine main combustion chamber design technology, and provides a ceramic matrix composite material flame tube matching design method and system.The method comprises the steps that a flame tube wall temperature interval of a main working state point is obtained; determining the thermal-state radial dimensions of the feature points on the ceramic-based component and the metal component; converting the hot-state radial size into a cold-state radial size; carrying out two-dimensional cold-state flame tube profile design; and the cold-state radial size of the two-dimensional cold-state flame tube molded surface is converted into the hot-state size to obtain a two-dimensional hot-state flame tube molded surface, and a three-dimensional hot-state model is constructed and evaluated and iteratively optimized. According to the method, matching structure characteristic parameters of the ceramic-based component and the metal component are designed, and the molded surface of the flame tube made of the different materials is self-adaptively formed into smooth transition at main working state points, so that a backflow area is actively controlled, and the problems that the stability of a flow field of a main combustion chamber is influenced and pressure is lost due to different and relative displacement changes in the working process are solved.

The invention discloses a convolutional neural network vehicle fuel consumption detection method based on ultrasonic sensors, and relates to the technical field of vehicle fuel consumption detection, and the method comprises the steps: 1, installing a plurality of ultrasonic sensor arrays on a vehicle, and monitoring the liquid level change of a fuel tank through the ultrasonic sensors; step 2, performing normalization processing on data acquired by the ultrasonic sensor, and eliminating differences caused by different measuring devices and measuring environments; and step 3, analyzing the preprocessed data through a convolutional neural network model to obtain the vehicle fuel consumption. According to the convolutional neural network vehicle fuel consumption detection method based on the ultrasonic sensor, the ultrasonic sensor is adopted, non-contact measurement is achieved, mechanical abrasion is reduced, key parameters related to fuel consumption, such as the fuel oil liquid level and the distance from a fuel spray nozzle to a combustion chamber can be accurately measured, and the fuel consumption can be accurately detected through accurate measurement of the parameters. And the actual fuel consumption of the diesel engine can be calculated more accurately.

The invention relates to the technical field of aero-engine combustion chamber outlet temperature field monitoring, and discloses a multi-source data fusion method for an aero-engine combustion chamber outlet temperature field, and the method comprises the steps: unifying a multi-source data space-time reference through a standardized space grid and a precise time synchronization protocol; mapping the data to the same space-time grid by adopting a self-adaptive interpolation algorithm, and embedding a temperature gradient continuity constraint; the confidence coefficient weight is dynamically calculated based on a sensor drift error model and CFD residual feedback, and working condition self-adaptive weighted fusion is realized by using a fuzzy logic rule base; and the interpolation parameters and the weight distribution threshold values are optimized in a distributed mode through a federated learning framework, and fuel injection parameters are adjusted in combination with combustion chamber closed-loop control. The temperature field reconstruction precision and reliability are remarkably improved, the service life of turbine blades can be prolonged, the combustion efficiency can be optimized, and the method is suitable for real-time monitoring and regulation of the combustion state of an aero-engine.

The invention relates to the technical field of combustion system optimization, and discloses a gas turbine combustion chamber outlet temperature distribution rapid prediction method and related equipment. The method comprises the following steps: collecting combustion chamber outlet temperature distribution data obtained through a CFD experiment mode; performing main mode extraction on the combustion chamber outlet temperature distribution data based on intrinsic orthogonal decomposition to obtain a POD coefficient matrix and a POD mode matrix; performing statistical fitting on the POD coefficient matrix by using a deep neural network, and establishing a POD coefficient prediction model; constructing an outlet temperature prediction model based on a parameterized reduced-order model based on the POD coefficient prediction model and the POD modal matrix; and utilizing the outlet temperature prediction model to perform rapid simulation prediction on the outlet temperature distribution of the combustion chamber under the combustion parameters to be optimized. According to the method, the calculation cost and time consumption of engine combustion chamber simulation can be effectively reduced, meanwhile, high simulation precision is kept, and powerful support is provided for optimization design of an advanced combustion chamber.

The invention discloses a wide-range rotary detonation combustion chamber runner structure and an operation method thereof, and belongs to the technical field of rotary detonation ramjet engines. Comprising an equipment throat, an expansion section and an outer ring switching section, the end, away from the equipment throat, of the expansion section is connected with an outer ring switching device, the outer ring switching device is connected with an equal direct oil injection section, the equal direct oil injection section is connected with an expansion concave cavity section, and the expansion concave cavity section is connected with an exhaust nozzle shell; an inner column is arranged in the outer ring switching device and the equal-straight oil injection section and movably connected with a plug type spray pipe. According to the flow channel structure of the wide-range rotary detonation combustion chamber, a plurality of static and dynamic pressure measuring points are arranged on the surface of the outer ring switching section, so that the combustion state is monitored in real time; the plug type spray pipe moves back and forth in the inner column guide rail through the lead screw, and the throat area is flexibly adjusted so as to adapt to the working range from the low Mach number to the high Mach number. The equal direct oil injection section ensures different combustion requirements through a multi-group annular injection design; the expansion concave cavity section is provided with a pre-explosion pipe connector and a plasma igniter installation panel, and the multi-work ignition requirement is met.

A gas turbine engine includes a turbomachine comprising compressor, combustion, and turbine sections. The gas turbine engine defines a maximum exhaust gas temperature, a maximum drive turbine shaft torque, and a corrected specific power. The gas turbine engine includes a controller configured to autonomously regulate performance of the gas turbine engine in response to at least one of: a thrust demand, an energy efficiency target, or a flight profile condition.

An aircraft propulsion system includes a series of condensers where water is condensed from the exhaust gas flow. Each of the series of condensers define a passage for exhaust gas flow such that water recovered from the exhaust gas flow drains at a downward angle in a direction of gravity through each of the series of condensers. A series of water separators separate the exhaust gas flow from water condensed in a corresponding one of the series of condensers and the water is transformed into a steam flow in an evaporator system for communication to the combustor.

The invention relates to the technical field of ignition systems of gas turbines, and discloses a special ignition system for a gas turbine, which comprises a monitoring control layer, an energy distribution layer and a combustion optimization layer. The monitoring control layer monitors parameters such as combustion chamber pressure fluctuation in real time through multiple types of sensors and executes phase synchronization and injection control. The energy distribution layer is provided with a multi-stage energy release strategy and a self-adaptive time sequence matching mechanism, a stable ignition energy field is constructed, and physical and digital space linkage regulation and control are achieved through a multi-modal energy interface; and the combustion optimization layer establishes a multi-dimensional mapping combustion state control model based on a dynamic combustion algorithm and real-time data, and adopts a collaborative optimization algorithm to calibrate an ignition time sequence, regulate and control a fuel mixing ratio and maintain flame stability. According to the system, through multi-dimensional energy fusion, model parameter dynamic correction and intelligent algorithm application, the accuracy, stability and multi-working-condition adaptability of the gas turbine ignition process are remarkably improved, and the system is suitable for gas turbine efficient combustion control in the fields of aerospace, electric power and the like.

A fuel reforming system for a vehicle on which a reciprocating engine is mounted is provided can comprise a decomposer to decompose hydrocarbon fuel into carbon and hydrogen gas by using heat and a pressure of combustion gas and a catalyst and to hold carbon. The decomposer can communicate with a combustion chamber via an openable / closable third port. A reforming space in which a reforming member including the catalyst is installed can be on the side of a connection portion of the decomposer with the third port. On an opposite side of interior of the connection portion of the decomposer with the third port, an additional space is provided to accommodate residual gas that remains in the third port and the decomposer when combustion gas is introduced into the decomposer through the third port.

A combustor includes a combustion liner that defines a combustion chamber and an outer sleeve spaced apart from the combustion liner, such that an annulus is defined between the combustion liner and the outer sleeve. The combustor further includes a fuel injection assembly having a boss coupled to at least one of the combustion liner and the outer sleeve. The boss includes an inner flange coupled to the combustion liner, an outer flange, and a body extending between the outer flange and the inner flange. The boss defines a cooling circuit having a post-impingement plenum defined in the inner flange between an inner wall of the inner flange and an impingement plate in cooling proximity to the inner wall; and a plurality of film cooling channels that are defined in the inner flange and fluidly couple the post-impingement plenum to the combustion chamber.

The pulverized coal rotational flow stable combustion burner comprises a shell, a primary air pipe, a first swirler, a backflow cap and a laser generator assembly, a secondary air duct is defined between the primary air pipe and an air guide section, the first swirler is arranged in the secondary air duct, the backflow cap is arranged in the secondary air duct, and the laser generator assembly is arranged in the secondary air duct. The backflow cap is arranged in the combustion chamber and located at the outlet end of the primary air pipe. The laser generator assembly is used for emitting sheet-shaped laser beams into the combustion chamber so as to ignite pulverized coal in the combustion chamber. According to the invention, the size and the shape of the laser beam spot are adjusted, and the ignition efficiency and the stability in the pulverized coal combustion process are obviously improved by the aid of a cooling and combustion control strategy in which tertiary air and secondary air are matched; meanwhile, the laser power and mode can be flexibly switched, different coal quality and load working conditions can be adapted, the adaptability and combustion efficiency of the combustor are greatly improved, the service life of a hearth and related parts is prolonged, and the operation cost is reduced.

The invention discloses a real-time early warning method for oscillation combustion of an afterburner, and the method comprises the steps: employing a network structure in which Fourier series is simplified and then the Fourier series is introduced into a Kolmogorov-Arnold network (Kolmogorov-ArnoldNetworks, KAN), proposing a Cosine Kolmogorov-Arnold network (CosKAN), and in combination with an anomaly detection idea, proposing a new algorithm which is named as an anomaly detection Kolmogorov-Arnold network (AD-KAN). Specifically, the algorithm can learn feature distribution of all normal sample points in an unsupervised manner, map the feature distribution to a high-dimensional space, and autonomously learn an early warning boundary through a minimum surrounding ellipsoid to realize early warning of afterburner oscillation combustion. In order to verify the feasibility of the method, a test is carried out on a certain type of turbofan aero-engine ground test bench, and the result shows that the AD-KAN method has excellent performance in precision, real-time performance, early warning performance and robustness. Therefore, the method has good early warning performance, and real-time early warning of aero-engine afterburner oscillation combustion can be effectively achieved.

The invention relates to the technical field of oil nozzles, in particular to an efficient atomization injection system for a direct injection oil injector in a cylinder. According to the technical scheme, an injection execution unit adopts a laser-cladded asymmetric injection hole array, fuel oil is evenly distributed in a combustion chamber through aperture gradient distribution and logarithmic spiral arrangement, and the oil-gas mixing effect is enhanced. The dynamic pressure adjusting unit is integrated with an MEMS film sensor array and a fuzzy neural network controller, a sensor can accurately monitor fuel oil pressure in real time, and the controller is based on a 7-12-3 type BP network and can rapidly and accurately adjust fuel injection pressure according to the working condition of an engine through mass data training. The fuel oil pretreatment unit comprises an ultrasonic cavitation device and a graded heating system, the ultrasonic cavitation device reduces the viscosity of fuel oil, and the graded heating system accurately controls the temperature by means of a PTC heater, a semiconductor laser and a vortex generator. The three units work cooperatively, the fuel oil atomization and combustion efficiency is greatly improved, pollutant emission is reduced, and the engine performance is remarkably improved.

A method is provided for operating a powerplant. During this method, a hydrocarbon fuel is delivered to a turbine engine for combustion within a combustion chamber of the turbine engine during initial startup operation of the turbine engine. Ammonia is at least partially cracked into hydrogen gas and nitrogen gas. A non-hydrocarbon fuel is delivered to the turbine engine for combustion within the combustion chamber of the turbine engine during post-startup operation of the turbine engine. The non-hydrocarbon fuel is or otherwise includes the hydrogen gas or a combination of the hydrogen gas and the nitrogen gas.

The embodiment of the invention provides a prediction method and device for the outlet temperature of an aero-engine combustion chamber, computer equipment and a medium, and relates to the technical field of performance evaluation and prediction.The method comprises the following steps that input parameters related to combustion chamber operation and combustion chamber structure are collected in batches, an optimal parameter set is generated, and the optimal parameter set is stored; working condition vectors are constructed through combustion chamber working conditions; constructing a stable parameter set through the optimized parameter set and the working condition vector, screening all parameters in the stable parameter set, and adjusting weights corresponding to the parameters in the working condition vector through an adaptive weight model; and constructing a physical constraint coupling prediction model, training the physical constraint coupling prediction model based on the physical constraint, generating a trained physical constraint coupling prediction model, and outputting the unevenness of the temperature distribution of the outlet of the combustion chamber through the model. According to the scheme, high-precision prediction of the temperature distribution unevenness of the outlet of the combustion chamber can be realized under the conditions of different pressures, temperatures, equivalence ratios and the like.

The invention discloses a flow field peeping type PIV measuring system and method in a backflow combustion chamber, and belongs to the technical field of flow field measurement in the backflow combustion chamber of an aero-engine, the flow field peeping type PIV measuring system in the backflow combustion chamber comprises a cooling purging device and a laser endoscope and / or a camera endoscope arranged in the cooling purging device; a cooling liquid channel, a purging gas channel and an endoscope channel which are not communicated with one another are arranged in the cooling purging device; the cooling liquid channel comprises a cooling liquid inlet channel from the connecting end to the detection end and a cooling liquid outlet channel from the detection end to the connecting end; the purging gas channel comprises a gas inlet located at the connecting end and a gas outlet located at the detecting end. The detection end is provided with the airflow guide structure, so that the purging gas flows to the end face of the endoscope channel along the end face of the detection end in a wall-attached mode, a stable wall-attached airflow barrier is formed, high-temperature fuel gas and soot are prevented from making direct contact with the mirror face of the endoscope, and mirror face pollution is effectively prevented.

The invention relates to the technical field of boiler combustion, and particularly discloses a boiler combustion chamber multi-parameter intelligent regulation and control method, which comprises the following steps: constructing a holographic combustion state sensing network, collecting a multi-mode signal of a boiler combustion chamber in real time, and generating a holographic feature vector through time-frequency collaborative feature fusion; constructing a working condition migration map based on the holographic feature vector, capturing a combustion parameter nonlinear coupling relationship by using a map attention neural network, and outputting CEP, FRP and a nonlinear coupling feature matrix; according to the method, a holographic combustion state sensing network and a time-frequency collaborative feature fusion technology are adopted, multi-mode signals of the boiler combustion chamber are collected in real time, and holographic feature vectors containing combustion stability indexes and NOx generation trend factors are generated, so that powerful support is provided for accurately describing the state and performance of the combustion chamber; and a nonlinear coupling relationship of combustion parameters is captured by using a working condition migration map and a map attention neural network, so that the accuracy of combustion efficiency prediction and fault risk assessment is improved.

Device for monitoring and controlling the high-temperature corrosion of water-cooled walls of a wall-like cut-circle boiler, characterized in that it comprises the following: a creation module for a meshed model, which serves to obtain a structure of the water-cooled wall of the wall-like circular boiler and to create a meshed model based on the structure of the water-cooled wall of the wall-like circular boiler; a creation module for a correlation model, which serves to obtain real-time parameters of the water-cooled wall of the wall-like circular vessel and to create a correlation model corresponding to the real-time parameters in combination with the networked model; a creation module for a three-dimensional model, which serves to simulate with the CFD data and the corresponding model in order to obtain the three-dimensional model of the temperature field and the CO field in the combustion chamber; a detection module for opening angles, which serves to obtain the deflection angles of various primary air nozzles and secondary air nozzles at different air volumes within the temperature field in the combustion chamber and the flap openings at different air volumes within the CO field on the basis of the three-dimensional models of the temperature field and the CO field of the combustion chamber; an adjustment module for deflection angles, which serves to obtain the optimal deflection angles of the primary air nozzles and the secondary air nozzles for the real-time air volume and the current temperature field in the combustion chamber based on the temperature and the real-time air volume at the appearance of the flame wall brushing in the boiler; an adjustment module for damper openings, which serves to obtain an optimal damper opening for the real-time air volume and the current CO field based on the CO concentration and the real-time air volume in the boiler.

A gas turbine engine including a compressor section for compressing air flowing therethrough to provide a compressed air flow and a reverse flow annular vortex combustor including a combustion chamber having a primary combustion zone, the combustion chamber configured to combust a mixture of a fuel flow and the compressed air flow in the primary combustion zone to generate a primary zone vortex. The reverse flow annular vortex combustor has a combustor liner and one or more driver openings extending through the combustor liner, the one or more driver openings providing a driver air flow formed of the compressed air flow. The driver air flow enters the combustion chamber as a wall of air for shaping and driving the primary zone vortex in the combustion chamber.

The invention provides a pyrolysis recovery method of a plastic packaging bag, and belongs to the technical field of plastic packaging bag recovery, the pyrolysis recovery method of the plastic packaging bag comprises the following steps: removing impurities from the waste plastic packaging bag, cleaning and drying, and controlling the moisture to be below 5%; the packaging bag is crushed into small blocks with the diameter smaller than 20 mm, so that the pyrolysis efficiency is improved; feeding the crushed plastic into a pyrolyzing furnace through a spiral feeder, adding an auxiliary pyrolyzing component, heating to 300-600 DEG C under an oxygen-free or oxygen-deficient condition, and carrying out thermal cracking; oil gas obtained after pyrolysis is condensed through a cooling system and classified, and solid residues are subjected to tempering treatment; flue gas generated after combustion is subjected to high-temperature degradation through a secondary combustion chamber and then subjected to multistage treatment through a quench tower, dust removal, alkali spraying and activated carbon adsorption, and it is ensured that the flue gas reaches the standard and is discharged; the problems that in the existing pyrolysis recycling process of the plastic packaging bags, the treatment efficiency is low, and the environment is still polluted can be solved.

The invention relates to the technical field of model design, in particular to an integrated design method and system for a three-dimensional simulation model of a natural gas burning gun. The method comprises the following steps: collecting geometric parameters and operation parameters of a natural gas burning gun to obtain initial equipment parameter information; performing laser micro-texture treatment on the inner surface of a combustion chamber of the natural gas combustion gun to generate periodic micro-groove array data; constructing a three-dimensional initial model of the natural gas burning gun through three-dimensional modeling software based on the initial equipment parameter information and the periodic micro-groove array data; and acquiring natural gas fuel characteristic data, inputting the fuel characteristic data into the three-dimensional initial model for combustion process simulation, and performing multi-dimensional evaluation on the simulated combustion process to generate a combustion process evaluation result. Through three-dimensional modeling, combustion simulation and dynamic optimization adjustment, the problems of low efficiency, large optimization difficulty, lack of real-time feedback and the like in traditional design are solved, and the design precision and combustion performance of the natural gas combustion gun are remarkably improved.

The invention belongs to the technical field of tail gas treatment, particularly relates to a tail gas treatment device for difluoromethane preparation, and provides the following scheme aiming at the problem that the existing tail gas treatment device for difluoromethane preparation is not easy to maintain and upgrade: the tail gas treatment device comprises an absorption tank; the upper side of the fixed base is connected with the bottom of the absorption tank through a flange, a round hole is formed in the bottom of the fixed base, a conveying pipe is fixedly connected into the round hole, the upper side of the absorption tank is fixedly connected with a discharge pipe and a combustion bin, and the inner wall of the combustion bin is fixedly connected with the exterior of the discharge pipe; one end of the discharge pipe away from the absorption tank is fixedly connected with a nozzle. According to the tail gas treatment device for difluoromethane preparation, the tail gas treatment device can be designed into a filtering module and an alkali washing module, so that the tail gas treatment efficiency of the device can be improved under the condition that the overall complexity is not increased, and the tail gas treatment device is convenient to maintain and upgrade.

A precombustion chamber igniter with a retractable electric glow plug and a cold start control method for a methanol engine are provided. The precombustion chamber igniter includes a fuel injector, a spark plug, and an electric glow plug. The electric glow plug is retractable and has two working positions, at a first position, a heating segment is wholly located in an injection chamber to provide heat energy for the injection chamber, and at a second position, the heating segment is partially located in the injection chamber and passes through a first through hole, and the rest of the heating segment is located in a main combustion chamber of an engine, to provide heat energy for the injection chamber and the main combustion chamber. In a cold start stage of the engine, the heating segment of the electric glow plug is controlled to be located at the second position.

The invention relates to the technical field of plasma generator protection, and discloses a plasma generator protection device which comprises a plasma generator provided with a mounting seat and a spray gun extending into a combustion chamber; the sleeve sleeves the spray gun and is used for replacing the spray gun to bear the scouring of primary air pulverized coal airflow in the combustion chamber; the powder slag cleaning part comprises a scraping plate, the length direction of the scraping plate is consistent with the length direction of the spray gun, and the scraping plate is attached to the periphery of the sleeve; the scraping plate is driven by an annular driving mechanism to rotate along the circumferential track of the outer surface of the sleeve, the movement path of the scraping plate is tightly attached to the outer circumferential face of the sleeve, and the rotation axis of the scraping plate coincides with the geometric axis of the sleeve, so that powder slag generated after hot melting of the surface of the sleeve is removed. Pulverized coal airflow scouring is blocked through the sleeve, powder slag is cleaned in combination with the annular driving scraper, the heat dissipation performance of the spray gun is guaranteed, the service life of the spray gun is remarkably prolonged, the maintenance cost is reduced, and the operation stability and economical efficiency of equipment are improved.

The invention belongs to the field of engines, and particularly relates to a dual-fuel regenerative cooling system and method. The cooling system comprises a combustion chamber, an ammonia supply device and a kerosene supply device; three layers of cooling flow channels are arranged in the wall face of the combustion chamber, the output ends of the three layers of cooling flow channels are arranged in the combustion chamber, and the three layers of cooling flow channels comprise a first cooling channel, a second cooling channel and a third cooling channel which are sequentially arranged from inside to outside. The ammonia supply device is connected with the input ends of the first cooling channel and the second cooling channel; the kerosene supply device is connected with the input ends of the third cooling channel and the second cooling channel; and ammonia or kerosene is introduced into the second cooling channel in a time-sharing manner. Through the three-layer cooling channel design and the fuel switchable function, the effects of fuel cooling, thermal protection, cracking hydrogen production and combustion organization are improved at the same time.