19 results about "Diffusion flame" patented technology

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 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.

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.

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 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.

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.

The application discloses a two-stage diffusion combustor, which comprises a first-stage reverse diffusion combustor, a connecting assembly and a second-stage positive diffusion combustor which are sequentially communicated from bottom to top, and an installation frame which is externally matched with the first-stage reverse diffusion combustor, the connecting assembly and the second-stage positive diffusion combustor. The two-stage diffusion combustor is combined by a standard first-stage reverse diffusion combustor and a second-stage positive diffusion combustor, a standard two-stage diffusion combustor is constructed, the generation process and the oxidation process of carbon smoke are separated, more accurate test data are provided for the detailed mechanism research of carbon smoke particles, and the development and optimization of subsequent combustion models are positively affected. Meanwhile, since the length of the diffusion flame is longer and the oxidation area of the carbon smoke particles is longer, the spatial resolution is improved, the requirement for measuring instruments is reduced, the separation of the generation and oxidation reaction of the carbon smoke particles is easier to measure and higher in precision.

A direct flame furnace burner unit for furnaces for the thermo-chemical treatment of steel strips in continuous hot-dip galvanizing plants includes a burner with a combustion head provided with a combustion chamber having an outlet opening of the combustion flame, and a body to which the combustion head is fixed. The body includes a first chamber which is in communication with the combustion chamber, a first lance for the injection of a fuel into the combustion chamber, a mixing chamber provided with at least a first inlet and a second inlet opening which is connectable to a second supply source, at least a second lance for the injection of the mixture into the combustion chamber. The burner is operable in two distinct operating modes, a diffusive flame combustion mode and a premixed flame combustion mode.

This invention discloses a method and system for acoustic fire extinguishing using a mobile robot to dynamically control the standing wave field. It relates to the field of acoustic fire extinguishing technology. The acoustic objective function constructed in this invention essentially seeks the physical path with the highest energy transmission efficiency. The acoustic wave follows physical laws to compensate for amplitude attenuation and phase distortion along the propagation path, achieving phase conjugate focusing at the fire source based on physical laws. This allows the acoustic focusing to jump from geometric superposition to phase conjugate focusing based on physical laws, increasing the acoustic particle velocity at the fire source. Furthermore, the synthesized acoustic vortex field forms a "ring-shaped vortex structure" around the fire source, generating a strong shearing and tearing effect and circulation on the flame front. Ultimately, by increasing the acoustic particle velocity at the fire source, the acoustic energy is efficiently, accurately, and adaptively delivered to the core area of ​​the fire source in the form of a "ring-shaped vortex structure," achieving highly efficient fire extinguishing of dynamically spreading flames.

This invention discloses an acoustic probe device for flames. The device includes a diffused flame burner, a signal generator, a power amplifier, a loudspeaker, an acoustic probe for conducting sound waves, and a three-dimensional displacement stage. The burner provides a stable laminar flame, and the signal generator provides an acoustic signal. This signal is amplified by the power amplifier and transmitted to the loudspeaker, which then emits corresponding sound waves. These sound waves are conducted into the flame through the acoustic probe. The loudspeaker is fixed on the three-dimensional displacement stage, and the position of the acoustic probe within the flame can be changed by adjusting the stage. The flame morphology after acoustic wave application is significantly different from that without acoustic wave application. This invention allows for the study of the effects of sound waves on different regions of the flame within a small range.