37 results about "Diffusion flame" patented technology

The invention belongs to the field of engine combustion and computational fluid mechanics, and discloses a novel flame surface turbulence combustion model. A model establishment process: solving a control equation of the diffusion flame surface turbulent combustion model to obtain a diffusion flame surface database; solving a control equation of the premixed flame surface turbulent combustion model to obtain a premixed flame surface database; solving a transport equation of speed, turbulence, mixing fraction and reaction progress variables to obtain flow field parameters; according to the mixing score and the reaction progress variable corresponding to each grid point of the flow field, temperatures and components are obtained in the diffusion and premixing flame surface databases in a table look-up interpolation mode; calculating a weighting function according to the flow field parameter of each grid point; performing weighted averaging on the obtained temperature and components through a weighting function; updating the original temperature and components of the flow field by using the weighted average temperature and components; and iteration is repeated until the flow field converges. The model gives full play to the advantages of diffusion and premixed flame surface turbulent combustion models, and has engineering applicability.

The invention relates to the technical field of jet flow flame disaster-causing parameter prediction, and discloses a jet flow diffusion flame size and radiation characteristic prediction method and system based on a machine learning method. The method comprises the following steps: constructing a flame size empirical model based on experimental data characteristics; constructing a machine learning model to predict flame height, width and lifting height, and combining the empirical model as a loss function with the empirical model; mass flow is determined according to the gas parameters, and a flame dwell time and radiation fraction calculation model is established in combination with a flame width prediction model; and establishing a flame total radiation power calculation model and a radiation source weighted distribution model, and solving the radiation heat flux by combining a flame height and lifting height prediction model. The prediction method provided by the invention can be used for predicting the sizes and radiation characteristics of jet diffusion flames with different scales under various working conditions, and has the characteristics of high prediction efficiency, high prediction precision, wide application range and the like.

An ammonia-blended fuel multi-stage micro-decomposition swirl burner (100) and a low NOx emission control method. The burner (100) is provided with a natural gas center pipe (1), a primary air pipe (2), and a burner housing (3) which are sequentially nested from inside to outside to form a primary air duct (4) and an overfire air duct (5) isolated from each other; natural gas is ejected from the natural gas center pipe (1); swirl vanes (7) are provided in the primary air duct (4), so that primary air can be mixed with central natural gas in a swirling state; then a diffusion flame is formed under the action of an ignition device (6); and a continuously burning pilot flame is formed in the center of an ejection end of the burner (100). Ammonia gas and natural gas are premixed to form ammonia-blended fuel, then the ammonia-blended fuel is ejected at a high speed through micro-decomposition holes (81), so as to form negative pressure to continuously entrain surrounding overfire air, meanwhile, the ammonia-blended fuel is ejected into a pilot flame high-temperature burning area in the center of the burner, so that ammonia is rapidly decomposed, a large amount of generated hydrogen is conducive to improving the burning stability, and NOx emission is reduced.

The invention discloses a spherical diffusion flame experimental device for simulating a microgravity environment on the ground, which comprises a combustion chamber (1), a spherical combustor (11) connected to a port of a fuel pipe (12) in the combustion chamber (1), and a flame combustion area (17) arranged on the periphery of the spherical combustor (11), and further comprises a gas density regulator (2) arranged on the outer wall of the combustion chamber (1), the combustion chamber (1) is used for increasing the gas density of a flame combustion area and reducing the gas density of an inner chamber of the combustion chamber (1), and the measuring mechanism (3) is connected into the inner chamber of the combustion chamber (1) and used for measuring physical parameters of flames and gas pressure in the combustion chamber. The device has the technical effects that the flame microgravity level is realized under the condition of balanced density by reducing the density difference between the gas in the flame combustion area and the cold medium around the flame, the effective experiment time under the microgravity condition is much longer than that of a tower falling experiment device, the cost is low, and equipment accidents or faults caused by electrifying for generating an electric field are avoided.

The application discloses a numerical calculation method and system for fuel blending turbulent combustion differential diffusion, and belongs to the field of turbulent combustion numerical simulation. The method comprises the following steps: a small flame table is established based on one-dimensional counterflow flame equation; through a mapping algorithm, thermodynamic state is parameterized as a function of mixing fraction and reaction process variable; a differential diffusion term of multi-fuel component is derived; control equations of a differential diffusion two-equation small flame model suitable for multi-fuel component under a large eddy simulation framework are established and solved; the model is discretized and coupled with a pressure-velocity field; in the process, simulation results of a small flame model without considering the differential diffusion effect are used as a comparison by the same method to highlight the influence of the differential diffusion effect. The application extends the differential diffusion two-equation model to multi-fuel blending conditions, takes a hydrogen-ammonia blended combustion two-fuel turbulent diffusion flame as an example, compares the mass fraction and temperature distribution of main components through a priori and posteriori method, and quantitatively analyzes the influence of the differential diffusion effect.

A fully premixed combustion low-nitrogen steam boiler relates to the technical field of steam boilers and comprises a box body and a plurality of standardized boiler modules sequentially arranged along a mounting cavity of the box body. The boiler module is composed of a boiler body, a full premixing burner, a negative pressure steam pocket and a symmetrical tubular heat exchanger. Spiral grooves are formed in the walls of the furnace body combustion cavities and communicated with the water heating cavities, so that water flow forms a thin-layer water film to strengthen heat exchange and prevent local dry burning, and the adjacent furnace body combustion cavities are communicated to realize smoke cascade transmission; hot air flow spirally circulates to prolong the heat exchange time, the full-premixing combustor is combined with the impeller to diffuse fuel gas, the metal fiber net forms low-temperature diffusion flames, and generation of nitric oxide is remarkably inhibited; the negative-pressure steam pocket accelerates evaporation in a negative-pressure environment, so that the steam production rate is increased; flue gas forms a U-shaped loop through the flow guide structure and flows through the tubular heat exchanger. The modular design supports on-demand combination and later expansion, the overall structure is high in heat efficiency, low in emission and safe and reliable in operation, and the multi-working-condition load requirement is met.

The invention relates to a soot aerosol generating device and a working method thereof. The device comprises a soot aerosol generating system and a gas supply system. The soot aerosol generating system comprises an oxidizing gas laminar flow cavity, a combustion cavity and a cooling and uniform mixing cavity; the oxidizing gas laminar flow cavity is provided with an oxidizing gas inlet and a fuel gas conveying pipe; a laminar flow plate is arranged at the lower end of the oxidizing gas laminar flow cavity; a plurality of laminar flow holes are formed in the laminar flow plate; the gas outlet end of the fuel gas conveying pipe penetrates through the oxidation gas laminar flow cavity and then extends into the combustion cavity, and a bluff body combustion head is installed at the gas outlet end of the fuel gas conveying pipe. Based on the diffusion flame combustion process of the organic fuel under different combustion conditions, soot aerosols with different particle sizes and different concentrations can be generated in a wide range, and the generated soot aerosols are stable in physicochemical property and can be used in multiple fields such as instrument test calibration and combustion characteristic research.

This invention discloses a method for identifying the pulsation frequency of a flame under the influence of an acoustic field. The method is validated using a back-diffusion flame as an example, identifying the pulsation frequency of the back-diffusion flame under different acoustic parameters. The method involves acquiring continuously changing flame images under different operating conditions using a non-invasive optical diagnostic system, binarizing the images to divide them into flame and non-flame regions, and calculating the overlap rate of each image relative to the first flame image. Analysis shows that the flame pulsation frequency can be determined by observing changes in the overlap rate. Experimental verification demonstrates that this method can accurately determine the flame pulsation frequency under different acoustic parameters.

The present invention belongs to the fields of engine combustion and computational fluid dynamics, and discloses a novel flamelet turbulent combustion model. The process of establishing the model is as follows: Solve the governing equations of the diffusion flamelet turbulent combustion model to obtain the diffusion flamelet database; solve the governing equations of the premixed flamelet turbulent combustion model to obtain the premixed flamelet database; solve the transport equations of velocity, turbulence, mixture fraction, and reaction progress variable to obtain the flow field parameters; obtain the temperature and components at each grid point of the flow field by means of table lookup and interpolation in the diffusion and premixed flamelet databases respectively according to the mixture fraction and reaction progress variable corresponding to each grid point of the flow field; calculate the weighting function from the flow field parameters of each grid point; perform weighted averaging on the obtained temperature and components through the weighting function; update the original temperature and components of the flow field with the weighted average temperature and components; repeat the iteration until the flow field converges. The model gives full play to the advantages of the diffusion and premixed flamelet turbulent combustion models and has engineering applicability.

The application discloses a multi-stage micro-decomposition cyclone burner for ammonia-doped fuel and low-NO x The control method, the natural gas center pipe, the primary air pipe and the burner shell are sequentially nested from inside to outside, forming a primary air channel and a burnout air passage which are isolated from each other, natural gas is sprayed out from the natural gas center pipe, the cyclone blade is arranged in the primary air channel, the primary air can be mixed with the central natural gas in a cyclone state, then a diffusion flame is formed under the action of an ignition device, in this way, a duty flame which can be continuously combusted is formed in the center of the spraying end of the burner; ammonia gas is premixed with natural gas to form ammonia-doped fuel, and the ammonia-doped fuel is sprayed out at a high speed through micro-decomposition holes to form a negative pressure which continuously sucks the surrounding burnout air, meanwhile, the ammonia-doped fuel is sprayed into the high-temperature combustion area of the duty flame in the center of the burner, so that the ammonia is rapidly decomposed, and a large amount of hydrogen gas generated by the ammonia is helpful to improve the combustion stability. The application has novel and reasonable structure arrangement, can improve the combustion stability, reduce the NO x emission and has the advantages of low cost, high efficiency, high safety and the like.

The invention relates to the technical field of preparation of photodiffusion flame-retardant master batches, in particular to a preparation method of a special photodiffusion flame-retardant master batch for polypropylene, which comprises the following steps: acquiring the dosage of a photodiffusant, the dosage of a flame retardant, the dosage of polypropylene, the dosage of an antioxidant and the dosage of a lubricant, and performing performance test on a sample master batch set to obtain a comprehensive performance test value; if the comprehensive performance test value is within a preset standard performance test interval, taking the selected flame-retardant master batch set as a qualified flame-retardant master batch set and taking the initial mass ratio as an optimal mass ratio, and if the comprehensive performance test value is not within the preset standard performance test interval, analyzing an unqualified flame-retardant master batch set to obtain analysis data; and recycling the unqualified flame-retardant master batch set to obtain a recycled master batch set, and completing the preparation of the special light-diffusion flame-retardant master batch for polypropylene based on the recycled master batch set and the optimal mass ratio. The fireproof performance and the optical performance of the polypropylene material can be improved.

The application discloses a material high-temperature hydrogen permeation simulation experiment device and experiment method based on a counter diffusion flame burner. Fuel enters a fuel cavity with horizontal initial momentum, is discharged after the initial momentum is weakened, and oxidant is vertically discharged with an initial speed and is distributed above the fuel gas flow, so that the fuel and the oxidant form a speed difference, the oxidant can form an entrainment effect on the fuel, the mixing of the oxidant and the fuel is promoted, the stability and heat release efficiency of the counter diffusion flame are improved, sufficient combustion and uniformity of flame temperature distribution are ensured, efficient and uniform mixing can be realized without a swirl generator, the structure of the counter diffusion flame burner is simplified, the equivalence ratio of the oxidant and the fuel can be adjusted by a data acquisition and control system to adjust the combustion state of the flame, so that the flame height, the temperature and the active free radical concentration are accurately controlled, the application scene of a sample is effectively simulated, various flame environments can be provided for performance experiments of the sample, and the experimental reliability is improved.

The invention discloses a numerical calculation method and system for turbulent combustion difference diffusion of mixed multiple fuels, and belongs to the field of turbulent combustion numerical simulation. Comprising the following steps: establishing a small flame table based on a one-dimensional hedging flame equation, parameterizing a thermodynamic state space into a function of a mixed fraction and a reaction process variable through a mapping algorithm, deducing a difference diffusion term of a multi-fuel component, and establishing and solving a difference diffusion double-equation small flame model control equation suitable for the multi-fuel component under a large vortex simulation framework; discretizing the processing model and coupling a pressure-velocity field; in the process, the same method is used for comparing a small flame model simulation result which does not consider the difference diffusion effect so as to highlight the influence of the difference diffusion effect. According to the method, a difference diffusion two-equation model is expanded to a multi-fuel mixing working condition, dual-fuel turbulence diffusion flame of hydrogen-ammonia mixing combustion is taken as an example, the mass fraction and temperature distribution of main components are compared through a prior method and a posterior method, and the influence of the difference diffusion effect is quantitatively analyzed.

This invention discloses a method and system for analyzing the steady-state of a laminar diffusion jet flame, relating to the field of gas turbine combustion technology. The method includes: obtaining the instantaneous propagation velocity of the laminar jet diffusion flame when the flame root reaches its final stable position during propagation towards the nozzle. S d and the local airflow velocity at that location U G ;according to S d and U G Determine the instantaneous combustion rate; compare the instantaneous combustion rate with... U G If the difference between the two is within a preset range, it indicates that the combustion rate and the local airflow velocity are in dynamic equilibrium, and it is determined to be a pusher flame; if the instantaneous combustion rate is greater than 1, it indicates that the combustion rate and the local airflow velocity are in dynamic equilibrium, and it is determined to be a pusher flame. U G If the difference exceeds a preset range, it indicates that the flame propagation and the extinction caused by heat loss are in equilibrium, and the flame is identified as an attached flame. This invention achieves precise identification of the flame's stable state by quantifying the comparison between combustion rate and airflow rate, providing a quantitative basis for combustion adjustment and significantly reducing operational blindness and time costs. A corresponding analysis system is also provided.

The embodiment of the invention provides a schlieren system and a flame transition process observation method. The system comprises a light source; the first schlieren mirror and the second schlieren mirror are oppositely arranged at an interval, and the first schlieren mirror is configured to reflect light rays emitted by the light source and form parallel light rays which penetrate through a test flow field between the first schlieren mirror and the second schlieren mirror and push jet flow diffusion flames; the schlieren imaging structure is arranged on a focusing path of the second schlieren mirror; wherein the second schlieren mirror is configured to focus the parallel light which is deflected due to density gradient in the test flow field to the schlieren imaging structure so as to generate a schlieren image capable of observing an intermittent breaking phenomenon in a jet transition process. By means of the schlieren system, the laminar flow and turbulent flow periodical alternating intermittent breaking phenomenon of pushing jet flow flames can be observed, whether flame jet flow enters the turbulent flow stage or not is determined according to disappearance of the intermittent breaking phenomenon of the jet flow in the schlieren image, and then the change characteristics of the flames and the interior of a combustion flow field are achieved.

This invention belongs to the field of nanomaterials and energy material preparation technology, and discloses a flexible carbon nanotube-based composite electrode material film and its preparation method. This method combines the high-temperature heat source provided by combustion with the inductive effect of an applied vertical DC magnetic field to achieve the directional growth and in-situ continuous film formation of carbon nanotubes in a low-pressure, closed environment. By transporting catalyst particles to the combustion reaction zone, the diffusion flame formed by methane and oxygen provides the carbon source and heat energy for carbon nanotube growth. Simultaneously, a magnetic field is applied to guide the carbon nanotubes to align in a specific direction and deposit them on a stainless steel mesh, forming a dense and flexible composite film. The resulting film exhibits excellent flexibility, good conductivity, and mechanical stability. This method is simple, requires low equipment investment, avoids the complexity of traditional high-temperature CVD processes and subsequent transfer processing, and achieves efficient and controllable preparation of flexible carbon nanotube composite electrode materials, showing broad application prospects.

The invention relates to a micro-scale flame combustion synthesis device for advanced carbon material preparation. Comprising a reaction chamber, a combustor and a gas inlet pipe. The reaction chamber is provided with an exhaust port, a sealing cover and an igniter; the burner is arranged in the furnace and comprises a base and a furnace plate, and the furnace plate is composed of a porous core and a plurality of capillary tubes embedded into part of micropores in a preset array. The gas inlet pipe penetrates through the side wall of the cavity, one end is connected with the combustor gas cabin, and the other end is connected with a gas source and provided with a flow controller. Vacant micropores of the porous core are directly connected with a base gas cabin, a two-dimensional plane micro-scale diffusion flame array is formed on the surface of the furnace plate after ventilation and ignition, and a one-dimensional high-temperature gas-phase reaction flow with uniform radial temperature and chemical components and only axial gradient change is generated in a post-flame reaction area. Compared with the prior art, the device for synthesizing the advanced material based on micro-scale flame array combustion is high in safety and reliability, easy and convenient to operate, low in comprehensive cost and stable and controllable in temperature zone and chemical components.

The invention relates to the technical field of gas turbine nozzles, in particular to a radial graded low-emission dual-fuel nozzle structure of a gas turbine, and aims to solve the problems that a conventional diffusion flame nozzle or a simple premixing nozzle is difficult to maintain low-NOx combustion in a high-load state, and the overall performance of the gas turbine is affected. According to the scheme, the nozzle comprises a first-stage natural gas premixing fuel pipe, a second-stage natural gas premixing fuel pipe on-duty natural gas fuel pipe, a fuel oil auxiliary oil way fuel pipe, a fuel oil main oil way fuel pipe, an on-duty natural gas fuel cavity, a first-stage natural gas premixing fuel cavity, a second-stage natural gas premixing fuel cavity and a nozzle end face air cavity which are arranged on the nozzle. The fuel nozzle comprises a first-stage natural gas premixing swirl vane, a second-stage natural gas premixing swirl vane, a fuel nozzle outer end face swirl vane, a fuel nozzle inner swirler fixator, a fuel main oil way injection device, a fuel auxiliary oil way nozzle, an auxiliary atomization air inlet, an auxiliary atomization device, an on-duty natural gas injection device and a fuel nozzle inner swirler. And the goal of low emission is achieved.

A process of partial oxidation is performed in a reactor which includes a reaction chamber and a burner assembly, wherein: the burner assembly has a single oxidant nozzle located within an fuel channel, said oxidant nozzle comprises a nozzle pipe and a nozzle outlet, the nozzle pipe and the fuel channel are arranged to produce a diffusion flame, the nozzle outlet has a shape with two or more elongate lobes projecting from a center of the nozzle pipe.

This disclosure relates to the technical field of nuclear reactor operational safety assessment. It proposes a method and system for assessing the safety of structures penetrated by hydrogen diffusion flames. This method assesses the impact of hydrogen diffusion flames on steel containment structures during severe reactor accidents. By rationally simulating hydrogen diffusion flames during severe reactor accidents, the consequences of hydrogen diffusion flames are evaluated, thereby assessing the integrity of steel containment structures penetrated by them. This method is suitable for assessing the consequences of hydrogen diffusion flames in passive nuclear power plants and can effectively evaluate the integrity of containment structures penetrated by hydrogen diffusion flames.

The invention relates to a high-stability soot aerosol generating device and method based on a transverse quenching principle. The device comprises a combustion cavity, a gas path system module and a circuit system module. The combustion cavity is used for generating soot particles through diffusion combustion of propane and oxidation air, and the soot particles are transversely cooled through quenching nitrogen to form nanoscale soot aerosol. And the gas path system module is used for providing fuel gas and combustion-supporting gas for the combustion cavity, and regulating and controlling the particle size and concentration of the nanoscale soot aerosol by controlling each gas flow. And the circuit system module is used for controlling and monitoring the device through a sensor and a control circuit. The nanoscale soot aerosol with stable and controllable particle size and concentration is generated on the basis of a diffusion flame transverse quenching method, the particle size and concentration of the aerosol can be adjusted in a large range by adjusting the combustion equivalence ratio and nitrogen doping in fuel, the calibration index requirement of mobile source emission particulate matter measurement equipment is met, and the calibration accuracy is improved. The method can be used for soot characteristic characterization, combustion mechanism research and the like.

The utility model relates to a soot aerosol generating device. The device comprises a soot aerosol generating system and a gas supply system. The soot aerosol generating system comprises an oxidizing gas laminar flow cavity, a combustion cavity and a cooling and uniform mixing cavity; the oxidizing gas laminar flow cavity is provided with an oxidizing gas inlet and a fuel gas conveying pipe; a laminar flow plate is arranged at the lower end of the oxidizing gas laminar flow cavity; a plurality of laminar flow holes are formed in the laminar flow plate; the gas outlet end of the fuel gas conveying pipe penetrates through the oxidation gas laminar flow cavity and then extends into the combustion cavity, and a bluff body combustion head is installed at the gas outlet end of the fuel gas conveying pipe. On the basis of diffusion flame combustion processes of organic fuel under different combustion conditions, soot aerosols with different particle sizes and different concentrations can be generated in a wide range, and the generated soot aerosols are stable in physicochemical property and can be applied to multiple fields such as instrument test calibration and combustion characteristic research.

The application discloses a kind of measurement methods of soot accumulation particle projection area, comprising the following steps: S10, collection soot accumulation particle;S20, obtain the gray scale image of soot accumulation particle, and calculate the real size represented by single pixel in gray scale image;S30, the gray scale image of soot accumulation particle is handled;S40, calculate soot accumulation particle projection area.The measurement method of soot accumulation particle projection area of the hydrocarbon fuel coaxial diffusion flame of the present application changes all by computer program automatic analysis processing by artificial operation, automatically divides out the projection area of soot accumulation particle in image and image background, and filters the noise point interference in image, compared with manual operation, this method can realize batch image analysis, greatly saves the time of artificial processing, while guaranteeing measurement accuracy, avoids subjective error generated by artificial operation.

The invention discloses a material high-temperature hydrogen permeation simulation experiment device and method based on a reverse diffusion flame burner, fuel enters a fuel cavity with horizontal initial momentum and is discharged after the initial momentum is weakened, and an oxidant is vertically discharged at an initial speed and is distributed above fuel airflow, so that a speed difference is formed between the fuel and the oxidant; the oxidant can form an entrainment effect on fuel so as to promote mixing of the oxidant and the fuel, improve stability and heat release efficiency of reverse diffusion flames and ensure sufficient combustion and flame temperature distribution uniformity, meanwhile, efficient and uniform mixing can be achieved without a rotational flow generator, the structure of the reverse diffusion flame burner is simplified, and the cost is reduced. The data acquisition and control system can adjust the equivalence ratio of the oxidant to the fuel so as to adjust the combustion state of the flame, so that the flame height, the temperature and the active free radical concentration are accurately controlled, the application scene of the sample is effectively simulated, various flame environments can be provided for the performance experiment of the sample, and the experiment reliability is improved.

The invention relates to the technical field of rocket engine combustion, in particular to a flame surface simulation method and electronic equipment suitable for turbulent combustion of a liquid rocket engine, and the method comprises the steps: obtaining propellant composition parameters of the liquid rocket engine; determining a proper real fluid state equation and a thermophysical property and transport property correction method according to propellant composition parameters; real fluid one-dimensional hedging diffusion flames are calculated according to a real fluid correction method and a two-point flame control method, a laminar diffusion flame surface database is constructed on the basis of the real fluid one-dimensional hedging diffusion flames, and the laminar diffusion flame surface database is expanded into a real fluid diffusion flame surface database considering turbulence fluctuation; and according to the real fluid diffusion flame surface database, constructing a turbulent combustion model suitable for the liquid rocket engine, and simulating the combustion behavior of the liquid rocket engine by using the turbulent combustion model. Therefore, the problems of simulation distortion, separation from actual combustion behaviors and the like of the turbulence combustion model under the ultrahigh-pressure working condition of the liquid rocket engine in the related technology are solved.

This invention discloses a method for quantitatively calculating composite combustion heat release pattern characteristics, relating to the technical field of combustion heat release pattern analysis. One specific embodiment of the invention includes determining supersonic and subsonic flow momentum, supersonic and subsonic combustion heat release rates, premixed and diffusion flame indices, and premixed and diffusion combustion heat release rates. The invention provides a visual post-processing calculation method capable of performing a relatively comprehensive quantification of combustion models, enabling rapid identification of the distribution of combustion heat release patterns in flow fields from numerical simulation results.

The invention discloses a low-Mach-number combustion regulation and control structure and method for a scramjet combustion chamber, and belongs to the technical field of combustion chambers. A low-Mach-number combustion regulation and control structure of a scramjet combustion chamber comprises an ignition supporting plate and a jet flow cavity, the ignition supporting plate is arranged in the middle of the front end of the combustion chamber and used for forming center flames in the combustion chamber, and the jet flow cavity is located on the wall face of the rear end of the combustion chamber and communicates with the combustion chamber through an air inlet and an air outlet. A fuel oil injection hole is formed in the side wall of the jet flow cavity and communicated with an oil tank of the combustion chamber through a fuel oil pipeline, an igniter is arranged in the jet flow cavity, high-temperature and high-pressure jet flow of the jet flow cavity is discharged into the combustion chamber to block main flow, a boundary layer is lifted, and center flame is promoted to form diffusion flame. By the adoption of the low-Mach-number combustion regulation and control structure and method for the scramjet combustion chamber, the problems that an existing regulation and control device is complex in structure and poor in stable combustion regulation stability of a combustor can be solved.

The utility model discloses a sintering material surface fuel gas injection device and a sintering injection system, and belongs to the technical field of sintering. The sintering material surface fuel gas injection device comprises a fuel gas injection pipe which is located above the sintering material surface, a fuel gas injection opening is formed in the lower end of the fuel gas injection pipe and used for injecting fuel gas to the sintering material surface, an anti-escape component is arranged on the fuel gas injection pipe and comprises an anti-escape plate arranged on the outer side of the fuel gas injection pipe, and the anti-escape plate is provided with a gas inlet and a gas outlet. The anti-escape plates are vertically and symmetrically distributed on the outer walls of the fuel gas injection pipes, the two anti-escape plates are obliquely arranged downwards, and a gap is formed between the anti-escape plates between every two adjacent fuel gas injection pipes. The anti-escape plate is used for blocking fuel gas ejected from the fuel gas injection pipe, so that micro-negative pressure is formed at an included angle between a charge level and the anti-escape plate, and a negative pressure gap is further formed among the sintering charge level, the fuel gas injection pipe and the anti-escape plate through the air bellow below the charge level, so that a wind zone is formed for blocking fuel gas escape, diffusion flames are formed as much as possible, and the service life of the sintering furnace is prolonged. Premixed flames are prevented from being formed, and explosion is prevented.

The invention provides a plane diffusion flame burner. The plane diffusion flame burner comprises a shell, a precursor pipeline and a burning assembly. Wherein the precursor pipeline is constructed to penetrate through the shell, and the precursor pipeline is suitable for inputting precursor aerosol; the combustion assembly comprises a honeycomb plate with through holes arranged in an array mode, the precursor pipeline passes through the center of the honeycomb plate, capillary tubes are embedded in at least part of the through holes to form fuel channels arranged in an array mode, the remaining through holes serve as oxidizing agent channels, and the number of the fuel channels is smaller than that of the oxidizing agent channels. The invention further provides a flame pyrolysis device and a preparation method of the lithium ion battery positive electrode material applying the flame pyrolysis device.

This invention discloses a self-excited oscillation experimental burner for a high-hydrogen fuel diffusion flame, comprising: a primary gas central swirl nozzle, a primary gas pipe, a secondary gas circumferential low-NOx nozzle, a burner mounting plate, a combustion air nozzle, a secondary gas collection chamber, a secondary gas pipe, a combustion air header, a combustion air inlet pipe, a height transition plate, a high-temperature tempered glass cylinder, and a flanged steel cylinder, etc.; the primary gas central swirl nozzle is threadedly connected to the primary gas pipe; the secondary gas circumferential low-NOx is evenly distributed on the burner mounting plate; the combustion air nozzle, combustion air header, and secondary gas collection chamber are welded and fixed to the burner mounting plate; the height transition plate is installed on the burner mounting plate; the high-temperature tempered glass cylinder is installed between the burner mounting plate and the height transition plate; and the flanged steel cylinder is installed on the height transition plate. This invention can realize self-excited oscillation combustion of a high-hydrogen fuel staged diffusion flame and is suitable for experimental research on the instability of high-hydrogen fuel combustion.