Spray combustion test device for metal-based gel fuel

Abstract

The invention relates to a spray combustion test device for metal-based gel fuel. The spray combustion test device comprises a combustion unit, a gel supply unit, a premixing gas unit, a fluidizing gas unit, a cooling unit and a data acquisition unit, the combustion unit comprises a furnace body, a spray generator and a combustion observation cover; the combustion observation cover and the furnace body are coaxially arranged in a mutually communicated mode, and the combustion observation cover is located on the upper side of the furnace body. The spray generator is connected with the bottom of the furnace body, and the spray generator and the furnace body coaxially extend into the furnace body; the gas premixing unit is connected with the furnace body; the gel supply unit and the fluidizing gas unit are respectively connected with the spray generator; the cooling unit is respectively connected with the spray generator and the data acquisition unit; and the data acquisition unit is connected with the combustion observation cover. Good atomization of gel can be achieved, flame morphology, smoke, spectrums and condensed phase particles are directly obtained, and high-temperature fuel gas heat tracing flow created by the device is closer to a high-temperature heat environment in an actual engine combustion chamber.

Description

Technical Field

[0001] The invention relates to an ignition combustion test device, in particular to a spray combustion test device for metal-based gel fuel. Background Art

[0002] As a new type of propellant, gel propellant has the advantages of high specific impulse, adjustable flow rate and safe storage, so it has broad application potential. In addition, thanks to the existence of the gel network, high-energy solid particles such as boron and aluminum can be stably suspended in the gel, thereby further enhancing the energy properties of the propellant such as density and calorific value. At present, the study of new engines using metal-based gel as fuel has become a new important research direction.

[0003] Although metal-based gels show great potential advantages, whether the gel is fully atomized and whether the metal particles therein are fully burned has a decisive influence on the engine performance. Gels generally undergo processes such as atomization, crushing, mixing, evaporation and combustion, and their residence time in the engine is still very short. At the same time, although solid particles such as boron and aluminum have high calorific values, the presence of their surface oxide layer also affects their further reaction. Therefore, it is necessary to comprehensively consider various factors, reasonably design the engine structure and operating conditions, and optimize the combustion organization method to achieve rapid ignition and combustion of metal particles, so as to improve the combustion efficiency of metal-based gels and improve engine performance.

[0004] Most of the research on metal-based gels is limited to single droplet tests, which is quite different from the actual working process of the gel in the engine. The physical properties of the gel itself are complex, and the presence of the gelling agent makes the gel exhibit non-Newtonian fluid properties. In particular, metal-based gels may have poor atomization effects due to their high viscosity, and may even cause blockage in the nozzle. In addition, the spray combustion process of metal-based gels has the complexity of solid-liquid two-phase coupled combustion, and its spray combustion process mechanism needs to be improved, and its environmental performance also needs to be evaluated. Therefore, the present invention proposes a gel spray combustion test device, which aims to optimize the metal-based gel atomization combustion process, and at the same time study the mechanism of the metal-based gel spray combustion process, so as to provide a theoretical basis and guidance for its efficient combustion and overall engine design, and lay a foundation for achieving green and sustainable development in the aviation field. Summary of the invention

[0005] The object of the present invention is to provide a spray combustion test device for metal-based gel fuel.

[0006] To achieve the above-mentioned purpose of the invention, the present invention provides a spray combustion test device for metal-based gel fuel, comprising: a combustion unit, a gel supply unit connected to the combustion unit, a premixing gas unit, a fluidizing gas unit, a cooling unit and a data acquisition unit;

[0007] The combustion unit comprises: a furnace body, a spray generator and a combustion observation cover;

[0008] The combustion observation cover is coaxially arranged to be connected to the furnace body, and the combustion observation cover is located on the upper side of the furnace body;

[0009] The spray generator is connected to the bottom of the furnace body, and the spray generator and the furnace body are coaxially extended into the furnace body;

[0010] The premixing unit is connected to the furnace body;

[0011] The gel supply unit and the fluidizing gas unit are respectively connected to the spray generator;

[0012] The cooling unit is respectively connected to the spray generator and some modules of the data acquisition unit;

[0013] The data acquisition unit is connected to the combustion observation cover.

[0014] According to one aspect of the present invention, the furnace body comprises: a furnace body lower part, a furnace body upper part, a rectifying baffle, a porous furnace plate, a premixed gas distributor and a spark plug;

[0015] The upper part of the furnace body, the porous furnace plate and the lower part of the furnace body are sequentially connected and arranged from top to bottom;

[0016] The rectifying baffle is arranged in the lower part of the furnace body, and the rectifying baffle is spaced apart from the porous furnace plate;

[0017] The premixed gas distributor is installed on the side wall of the lower part of the furnace body, and the position where the premixed gas distributor is connected to the lower part of the furnace body is below the rectifying baffle;

[0018] The spark plug is mounted on the side wall of the upper part of the furnace body.

[0019] According to one aspect of the present invention, the lower part of the furnace body comprises: a lower cylinder, a cylinder bottom plate arranged at the bottom end of the lower cylinder, and a positioning support cylinder arranged on the upper side of the cylinder bottom plate;

[0020] The bottom plate of the cylinder is a hollow annular plate, the outer side of which is fixedly connected to the inner side of the bottom end of the lower cylinder;

[0021] The positioning support cylinder is a hollow cylinder with openings at both ends, and its bottom end is fixedly connected to the upper side of the cylinder bottom plate, and the hollow part of the positioning support cylinder and the hollow part of the cylinder bottom plate are interconnected to form an interlocking channel for installing the spray generator.

[0022] According to one aspect of the present invention, the rectifying baffle is an annular plate as a whole, and its radial inner side is connected to the outer side of the positioning support cylinder by being nested with each other, and its radial outer side is connected to the inner side of the lower cylinder by being nested with each other;

[0023] The rectifying baffle is regularly provided with a plurality of rectifying holes;

[0024] The porous furnace plate comprises: an annular furnace plate body, a first furnace plate support arranged inside the annular furnace plate body, and a second furnace plate support arranged outside the annular furnace plate body;

[0025] The first furnace plate is supported on the upper end of the positioning support cylinder, and the second furnace plate is supported and arranged between the lower part of the furnace body and the upper part of the furnace body;

[0026] The annular furnace plate body is regularly provided with a plurality of gas holes.

[0027] According to one aspect of the present invention, an upper layer of zirconia bead structure and a lower layer of zirconia bead structure are provided on the upper side of the rectifying baffle;

[0028] The position where the premixed gas distributor is connected to the lower part of the furnace body is below the rectifying baffle;

[0029] The aperture of the rectifying hole of the rectifying baffle is smaller than the diameter of the zirconia beads in the lower zirconia bead structure;

[0030] The diameter of the gas through holes on the annular furnace plate body is 0.8-1.0 mm, and the center distance between adjacent gas through holes is 1.2-1.7 mm.

[0031] According to one aspect of the present invention, the upper portion of the furnace body is a hollow cylinder with openings at two opposite ends;

[0032] The premixed gas distributor comprises: a hollow distribution ring, a connecting pipe arranged on the radial inner side of the distribution ring, and a premixed gas nozzle arranged on the radial outer side of the distribution ring;

[0033] Along the circumference of the distribution ring, a plurality of connecting pipes are arranged at regular intervals, and the connecting pipes are respectively connected to the lower cylinder.

[0034] According to one aspect of the present invention, the spray generator comprises: a generator body, a liquid cap, an air cap and a sealing cap;

[0035] Along the direction from top to bottom, the air cap, the liquid cap and the generator body are coaxially connected in sequence;

[0036] The sealing cap is connected to the upper end of the generator body and is used to seal the air cap and the liquid cap in the hollow part thereof;

[0037] The generator body is in a cylindrical structure as a whole, and a first gel channel, a first fluidizing gas channel and a cooling water channel are arranged in the generator body;

[0038] The first gel channel is connected to the gel supply unit;

[0039] The first fluidizing gas channel is connected to the fluidizing gas unit;

[0040] The cooling water channel is connected to the cooling unit;

[0041] The liquid cap is in a columnar structure as a whole, and a second gel channel and a second fluidizing gas channel are provided in the liquid cap;

[0042] The air cap is in a columnar structure as a whole, and a mixing channel is provided in the liquid cap;

[0043] The second gel channel is connected to the first gel channel;

[0044] The second fluidizing gas channel is connected to the first fluidizing gas channel;

[0045] The mixing channel is communicated with the second gel channel and the second fluidizing gas channel respectively;

[0046] The cooling water channel is communicated with the hollow portion of the sealing cap to supply cooling water to the air cap and the liquid cap.

[0047] According to one aspect of the present invention, the first gel channel is coaxially arranged with the generator body, and axially penetrates through opposite ends of the generator body;

[0048] A plurality of the first fluidizing gas channels are arranged on the generator body, and the plurality of the first fluidizing gas channels are arranged at equal intervals around the first gel channel; wherein the upper end of the first fluidizing gas channel in the axial direction has an opening at the upper end of the generator body, and the lower end thereof in the axial direction has an opening at the lower end or the side wall of the generator body;

[0049] The cooling water channels are provided in plurality on the generator body, and the plurality of cooling water channels are provided at equal intervals around the first gel channel; wherein the upper end of the cooling water channel in the axial direction has an opening at the upper end of the generator body, and the lower end thereof in the axial direction has an opening at the lower end or the side wall of the generator body;

[0050] Along the radial direction of the generator body, the distance between the cooling water channel and the first gel channel is greater than the distance between the first fluidizing gas channel and the first gel channel;

[0051] The second gel channel is coaxially arranged with the liquid cap, and a gel distribution member is provided at one end of the second gel channel away from the generator body;

[0052] The second fluidizing gas channels are arranged in one-to-one correspondence with the first fluidizing gas channels, and the second fluidizing gas channels are arranged at equal intervals around the second gel channel;

[0053] Along the direction away from the generator body, the second fluidizing gas channel is arranged to be inclined toward the direction close to the second gel channel;

[0054] The mixing channel comprises: a first mixing channel portion and a second mixing channel portion which are coaxially arranged;

[0055] Along a direction away from the liquid cap, the first mixing channel portion and the second mixing channel portion are arranged in sequence;

[0056] The first mixing channel portion and the second mixing channel portion are respectively conical annular channels;

[0057] The large diameter end of the second mixing channel portion is connected to the small diameter end of the first mixing channel portion.

[0058] According to one aspect of the present invention, an extension tube is coaxially arranged at one end of the liquid cap away from the generator body;

[0059] The extension tube extends into the second mixing channel portion, and the outer diameter of the extension tube is smaller than the inner diameter of the second mixing channel portion;

[0060] The hollow portion of the extension tube is communicated with the second gel channel, and the gel distribution member is arranged at one end of the extension tube extending into the second mixing channel.

[0061] According to one aspect of the present invention, the combustion observation cover is a hollow cover body with an opening at the lower end, and comprises: an observation cover body and a quartz glass plate;

[0062] The side wall of the observation cover body is provided with an installation window, and the quartz glass plate is installed on the installation window;

[0063] The gel supply unit comprises: a support, a syringe and an extrusion assembly supported on the support;

[0064] The syringe is used to contain the metal-based gel fuel, and the extrusion assembly is connected to the syringe;

[0065] The data acquisition unit includes: a camera, a spectrometer, a spring sampler, a water-cooled probe and a flue gas analyzer;

[0066] The camera is arranged relative to the quartz glass plate;

[0067] The spectrometer, the spring sampler, and the water-cooled probe are respectively connected to the observation cover body;

[0068] The flue gas analysis is connected to the water-cooled probe.

[0069] According to one scheme of the present invention, the present invention can simulate gel spray combustion tests in different gas components and different gas temperature environments, realize the spray combustion of gels of different metal types, particle sizes and contents in the flame field, and obtain parameters such as flame shape, ignition delay time, combustion product morphology, particle size and gas pollutants.

[0070] According to one scheme of the present invention, the present invention can achieve good atomization of the gel and directly obtain flame morphology, flue gas, spectrum and condensed phase particles. At the same time, the high-temperature combustion gas thermal flow created by the flat flame furnace is closer to the high-temperature thermal environment in the actual engine combustion chamber, and the experimental data obtained has high engineering application value.

[0071] According to one solution of the present invention, the flow rate of the gel can be accurately controlled by the travel amount of the precise syringe, thereby ensuring the repeatability of the test.

[0072] According to one solution of the present invention, the present invention can create a high-temperature premixed flame, and parameters such as gas composition, gas temperature, and airflow velocity can be adjusted according to test requirements.

[0073] According to one solution of the present invention, the present invention can utilize a flue gas analysis device to obtain the pollutant release conditions during the metal-based gel spray combustion process, thereby providing a basis for optimizing its combustion.

[0074] According to one solution of the present invention, the present invention can obtain parameters such as flame morphology and ignition delay time by using a high-speed camera, providing a basis for determining the metal-based gel spray combustion characteristics.

[0075] According to one scheme of the present invention, the present invention collects metal particle combustion products through a spring sampler, and performs offline detection such as SEM and XRD on the combustion products to obtain the combustion state of metal particles under different working conditions, positions and times during the metal-based gel spray combustion process.

[0076] According to one scheme of the present invention, compared with the traditional single droplet test, the metal-based gel spray combustion environment created by the planar flame burner is closer to the gel working process in the actual engine, and the engineering application value of the obtained test data is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1is a structural diagram schematically showing a spray combustion test device according to an embodiment of the present invention;

[0078] Figure 2 is a cross-sectional view schematically showing a spray combustion test device according to one embodiment of the present invention;

[0079] Figure 3 is a cross-sectional view schematically showing a spray generator according to one embodiment of the present invention;

[0080] Figure 4 is a schematic structural diagram of a gel distribution member according to an embodiment of the present invention;

[0081] Figure 5 is a schematic diagram showing an installation structure of a gel distribution member according to another embodiment of the present invention;

[0082] Figure 6 is a structural diagram schematically showing a gel distribution member according to another embodiment of the present invention;

[0083] Figure 7 is a schematic diagram showing an installation structure of a gel distribution member according to another embodiment of the present invention;

[0084] Figure 8 is a schematic structural diagram of a gel distribution member according to another embodiment of the present invention;

[0085] Fig. 9 is a schematic structural diagram of a gel distribution member according to another embodiment of the present invention;

[0086] Fig.10 is a structural diagram schematically showing a syringe according to one embodiment of the present invention;

[0087] Fig.11 is a structural diagram schematically showing a syringe according to another embodiment of the present invention;

[0088] Fig.12 is a structural diagram schematically showing a spring sampler according to an embodiment of the present invention;

[0089] Fig.13 is a structural diagram schematically showing a water-cooled probe according to an embodiment of the present invention;

[0090] Fig.14 is a schematic diagram of a flame diagram of spray combustion of a boron-containing gel according to one embodiment of the present invention;

[0091] Fig.15The figure schematically shows the morphology of the intermediate products of the combustion of boron particles in the boron-containing gel spray according to one embodiment of the present invention. DETAILED DESCRIPTION

[0092] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0093] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0094] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0095] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, a spray combustion test device for metal-based gel fuel of the present invention comprises: a combustion unit 1, a gel supply unit 2 connected to the combustion unit 1, a premixing gas unit, a fluidizing gas unit, a cooling unit and a data acquisition unit 3; in this embodiment, the combustion unit 1 comprises: a furnace body 11, a spray generator 12 and a combustion observation cover 13; wherein the combustion observation cover 13 is coaxially arranged to be interconnected with the furnace body 11, and the combustion observation cover 13 is located on the upper side of the furnace body 11; the spray generator 12 is connected to the bottom of the furnace body 11, and the spray generator 12 and the furnace body 11 extend into the furnace body 11 coaxially. In this embodiment, the premixing gas unit is connected to the furnace body 11; the gel supply unit 2 and the fluidizing gas unit are respectively connected to the spray generator 12; the cooling unit is respectively connected to the spray generator 12 and some modules of the data acquisition unit 3; the data acquisition unit 3 is connected to the combustion observation cover 13.

[0096] In this embodiment, the spray combustion test device is supported on a test platform, wherein the test platform includes: a horizontal surface 41 and a vertical support plate 42; two vertical support plates 42 are arranged at intervals on the lower side of the horizontal surface 41, and the two vertical support plates 42 are arranged opposite to each other to achieve stable support for the horizontal surface 41.

[0097] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, the furnace body 11 is supported on a horizontal surface 41, wherein the furnace body 11 comprises: a furnace body lower part 111, a furnace body upper part 112, a rectifying baffle 113, a porous furnace plate 114, a premixed gas distributor 115 and a spark plug 116. In this embodiment, the furnace body upper part 112, the porous furnace plate 114 and the furnace body lower part 111 are sequentially connected from top to bottom; the rectifying baffle 113 is arranged in the furnace body lower part 111, and the rectifying baffle 113 and the porous furnace plate 114 are arranged with a gap. In this embodiment, the premixed gas distributor 115 is installed on the side wall of the furnace body lower part 111, and the position where the premixed gas distributor 115 is connected to the furnace body lower part 111 is below the rectifying baffle 113; the spark plug 116 is installed on the side wall of the furnace body upper part 112.

[0098] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, the lower part 111 of the furnace body includes: a lower cylinder 111a, a cylinder bottom plate 111b arranged at the bottom end of the lower cylinder 111a, and a positioning support cylinder 111c arranged on the upper side of the cylinder bottom plate 111b; wherein the lower cylinder 111a is a cylinder as a whole, and the outer sides of the upper and lower ends thereof are provided with connecting flanges to respectively realize the connection with the corresponding structure, for example, by using threaded connectors. In this embodiment, the cylinder bottom plate 111b is a hollow annular plate, and its outer side surface is fixedly connected to the inner side surface of the bottom end of the lower cylinder 111a; the positioning support cylinder 111c is a hollow cylinder with openings at both ends, and its bottom end is fixedly connected to the upper side of the cylinder bottom plate 111b, and the hollow part of the positioning support cylinder 111c and the hollow part of the cylinder bottom plate 111b are connected to each other to form an interlocking channel for the installation of the spray generator 12.

[0099] Combination Figure 1 , Figure 2 and Figure 3As shown, according to one embodiment of the present invention, the rectifying baffle 113 is an annular plate as a whole, and its radial inner side edge is connected to the outer side of the positioning support tube 111c by being nested with each other, and its radial outer side edge is connected to the inner side of the lower cylinder 111a by being nested with each other; wherein, a plurality of rectifying holes are regularly arranged on the rectifying baffle 113. In this embodiment, a supporting step surface is arranged on the outer side surface of the positioning support tube 111c, and then, the sleeve support of the inner ring edge of the rectifying baffle 113 and the positioning support tube 111c can be realized. Correspondingly, a supporting step surface is arranged on the inner side of the lower cylinder 111a to realize the support of the outer ring edge of the rectifying baffle 113. In this embodiment, the two radial ring edges of the rectifying baffle 113 can be respectively fixed to the positioning support tube 111c and the lower cylinder 111a by threaded connectors. Of course, in another embodiment, the two radial ring edges of the straightening baffle 113 can be respectively fixed to the straightening baffle 113 by means of sleeve pressing. Specifically, a first sleeve that is sleeved with the positioning support tube 111c can be provided to press the straightening baffle 113 through the bottom end of the first sleeve. Of course, after the first sleeve is sleeved with the positioning support tube 111c, a threaded connection can be further used to fix the first sleeve to the positioning support tube 111c. Correspondingly, a second sleeve that is sleeved with the lower cylinder 111a can be provided to press the straightening baffle 113 through the bottom end of the second sleeve. Of course, after the second sleeve is sleeved with the lower cylinder 111a, a threaded connection can be further used to fix the second sleeve to the lower cylinder 111a.

[0100] In this embodiment, the height of the rectifying baffle 113 from the cylinder bottom plate 111 b is 15 mm to 24 mm, so that a certain space is provided below the rectifying baffle 113 to form a premixing zone connected to the premix distributor 115 .

[0101] In this embodiment, the diameter of the rectifying holes on the rectifying baffle 113 is 1.8-2 mm, the center distance between adjacent holes is 3.8-4.3 mm, 6 rectifying holes are evenly arranged around each rectifying hole, and the micro-hole area is distributed between 60-150 mm.

[0102] Combination Figure 1 , Figure 2 and Figure 3As shown, according to an embodiment of the present invention, the porous furnace plate 114 includes: an annular furnace plate body 114a, a first furnace plate support 114b arranged inside the annular furnace plate body 114a, and a second furnace plate support 114c arranged outside the annular furnace plate body 114a; wherein the first furnace plate support 114b is supported on the upper end of the positioning support cylinder 111c, and the second furnace plate support 114c is arranged between the furnace body lower part 111 and the furnace body upper part 112. In this embodiment, the first furnace plate support 114b is an annular structure as a whole, and it is coaxially supported on the upper end of the positioning support cylinder 111c with the positioning support cylinder 111c, and the first furnace plate support 114b is fixed to the positioning support cylinder 111c by a threaded connector. In this embodiment, a sealing structure is arranged between the first furnace plate support 114b and the upper end of the positioning support cylinder 111c to maintain the sealing of the abutting position, wherein the sealing structure can adopt a brass sealing ring.

[0103] In this embodiment, the second furnace plate support 114c is an annular plate body, and its radial dimension is consistent with the radial dimension of the connecting flange provided at the upper end of the lower cylinder 111a. In this embodiment, an annular protrusion is provided on the lower side of the second furnace plate support 114c, and correspondingly, an annular groove matching the annular protrusion is provided on the corresponding connecting flange, thereby realizing the positioning and installation of the second furnace plate support 114c between the furnace body lower part 111 and the furnace body upper part 112.

[0104] Through the above-mentioned arrangement, by providing an annular protrusion on the lower side of the second furnace plate support 114c to match the annular groove on the connecting flange, on the one hand, accurate positioning of the porous furnace plate 114 can be achieved, and on the other hand, sealing of the connecting position can be achieved to effectively ensure the airtightness of the connecting position, thereby effectively ensuring the safety and reliability of the use of the present invention.

[0105] In this embodiment, the annular stove plate body 114a is regularly provided with a plurality of gas holes. The diameter of the gas holes on the annular stove plate body 114a is 0.8-1.0 mm, and the center distance between adjacent gas holes is 1.2-1.7 mm. In this embodiment, 6 gas holes are evenly arranged around each gas hole, and the gas holes are distributed between 60 mm and 150 mm. For example, 6000 gas holes can be provided on the annular stove plate body 114a, each gas hole has a diameter of 0.8 mm, and the center distance between adjacent gas holes is 1.2 mm.

[0106] Through the above-mentioned arrangement, by arranging gas through holes on the annular furnace plate main body 114a and arranging the gas through holes within the above-mentioned size range, the total area of ​​the furnace plate through holes can be effectively reduced, the premixed gas flow rate can be increased, the gas flow rate can be made greater than the flame propagation speed, and the flashback can be reduced; in addition, through the above-mentioned arrangement, the spacing between the gas through holes is small, thereby effectively ensuring the uniformity of the gas; in addition, based on the above-mentioned arrangement, the processing cost of the entire porous furnace plate 114 can be effectively reduced, and the economic efficiency of the use of the present invention can be effectively improved.

[0107] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, an upper zirconia bead structure and a lower zirconia bead structure are respectively arranged on the upper side of the rectifying baffle 113, wherein a stainless steel mesh is arranged between the upper zirconia bead structure and the lower zirconia bead structure to separate them; in this embodiment, the diameter of the zirconia beads in the upper zirconia bead structure is smaller than the diameter of the zirconia beads in the lower zirconia bead structure, and the aperture of the rectifying hole of the rectifying baffle 113 is smaller than the diameter of the zirconia beads in the lower zirconia bead structure.

[0108] Through the above-mentioned arrangement, by arranging an upper zirconia bead structure and a lower zirconia bead structure on the upper side of the rectifying baffle 113, the premixed gas entering the premixing zone below the rectifying baffle 113 can be rectified after passing through the rectifying plate, the lower zirconia bead structure and the upper zirconia bead structure, on the one hand, to make the premixed gas more evenly mixed, and on the other hand, it can conveniently fill the space between the porous furnace plate 114 and the rectifying baffle 113, which can effectively prevent the risk of explosion caused by a large amount of premixed gas in the furnace drum.

[0109] In this embodiment, the position where the premixed gas distributor 115 is connected to the furnace lower portion 111 is below the rectifying baffle 113 .

[0110] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to an embodiment of the present invention, the furnace body upper part 112 is a hollow cylinder with openings at opposite ends; wherein the radial dimension of the hollow part of the furnace body upper part 112 is arranged to be consistent with the radial dimension of the hollow part of the furnace body lower part 111. In this embodiment, the upper and lower ends of the furnace body upper part 112 are also provided with connecting flanges for connection, so that the furnace body lower part 111, the porous furnace plate 114, and the furnace body upper part 112 can be more conveniently connected in sequence and accurately, thereby effectively ensuring the reliability and stability of the structure of the entire furnace body 11.

[0111] In this embodiment, a spark plug mounting hole is provided on the side wall of the furnace body upper portion 112 to achieve a nested arrangement with the spark plug 116. In this embodiment, in the vertical direction, the interval between the spark plug 116 and the porous furnace plate 114 is 30 mm to 40 mm, and in the radial direction of the furnace body upper portion 112, the spark plug 116 penetrates into the interior of the furnace body upper portion 112 by 10 mm to 20 mm.

[0112] Through the above arrangement, it is possible to effectively ensure that the spark plug 116 has sufficient ignition space while effectively avoiding the influence on the premixed gas combustion flow field.

[0113] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, the premix distributor 115 includes: a hollow distribution ring 115a, a connecting pipe 115b arranged on the radial inner side of the distribution ring 115a, and a premix nozzle 115c arranged on the radial outer side of the distribution ring 115a; wherein, along the circumference of the distribution ring 115a, a plurality of connecting pipes 115b are arranged at regular intervals, and the connecting pipes 115b are respectively connected to the lower cylinder 111a. In this embodiment, in the circumferential direction of the distribution ring 115a, two connecting pipes 115b are arranged at equal intervals, thereby making the connecting pipes 115b connected at opposite sides of the lower part 111 of the furnace body.

[0114] In this embodiment, the premixed gas distributor 115 is connected to the premixed gas unit through the premixed gas nozzle 115c; wherein the premixed gas output by the premixed gas unit is a mixture of methane, air and oxygen. In this embodiment, the premixed gas distributor 115 is provided with a gas mass flow controller to achieve precise control of the premixed gas flow rate. In this embodiment, in order to achieve a stable and uniform methane laminar flame on the surface of the porous furnace plate 114, the methane standard volume flow rate is required to be at least 20 SLCM and above, and the oxygen flow rate is at least greater than or equal to twice the methane flow rate, and the air flow rate is greater than the flow rates of methane and oxygen to prevent flashback and ensure the stability and reliability of the combustion process.

[0115] Combination Figure 1 , Figure 2 and Figure 3As shown, according to one embodiment of the present invention, the spray generator 12 includes: a generator body 121, a liquid cap 122, an air cap 123 and a sealing cap 124; wherein, from top to bottom, the air cap 123, the liquid cap 122 and the generator body 121 are coaxially connected in sequence. In this embodiment, the sealing cap 124 is connected to the upper end of the generator body 121, and is used to seal the air cap 123 and the liquid cap 122 in the hollow part thereof; specifically, the sealing cap 124 is a cylindrical body with openings at both ends, and the upper end opening position thereof is sealedly connected to the outer side of the air cap 123, and the lower end opening position thereof is sealedly connected to the generator body 12, thereby sealingly covering the liquid cap 122 and the air cap 123.

[0116] In this embodiment, the generator body 121 is a cylindrical structure as a whole, and a first gel channel 121a, a first fluidizing gas channel 121b and a cooling water channel 121c are provided in the generator body 121; wherein the first gel channel 121a is connected to the gel supply unit 2; the first fluidizing gas channel 121b is connected to the fluidizing gas unit; and the cooling water channel 121c is connected to the cooling unit. In this embodiment, in the circumferential direction of the generator body 121, the first fluidizing gas channels 121b can be arranged to be 6 at equal intervals to achieve sufficient fluidizing gas output.

[0117] In this embodiment, the liquid cap 122 has a columnar structure as a whole, and a second gel channel 122a and a second fluidizing gas channel 122b are provided in the liquid cap 122; wherein the second gel channel 122a is connected to the first gel channel 121a; the second fluidizing gas channel 122b is connected to the first fluidizing gas channel 121b; wherein the diameter of the liquid cap 122 can be set to 0.7 mm to 1.3 mm.

[0118] In this embodiment, the air cap 123 is a columnar structure as a whole, and a mixing channel 123a is provided in the liquid cap 122; wherein the mixing channel 123a is respectively connected to the second gel channel 122a and the second fluidizing gas channel 122b; wherein the diameter of the air cap 123 can be set to 1.5-2mm.

[0119] In the present embodiment, the cooling water channel 121 c is communicated with the hollow portion of the sealing cap 124 to supply cooling water to the air cap 123 and the liquid cap 122 .

[0120] In this embodiment, an air cap annular protrusion is provided on the outer edge of the lower end of the air cap 123, and a connecting thread is provided on the outer side of the upper end of the liquid cap 122, so that a locking nut 125 can be provided between the connecting position of the air cap 123 and the liquid cap 122. By pressing the locking nut 125 against the air cap annular protrusion and connecting with the connecting thread on the upper end of the liquid cap 122, the air cap 123 and the liquid cap 122 can be fixedly connected, and the sealing of the connecting position can be ensured to ensure a stable and reliable connection of the connecting channel.

[0121] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, the first gel channel 121a is coaxially arranged with the generator body 121, and it axially penetrates the opposite ends of the generator body 121; in this embodiment, the first gel channel 121a is provided with a gel nozzle 121a1 at the lower end of the generator body 121 to facilitate connection with the gel supply unit 2.

[0122] In this embodiment, a plurality of first fluidizing gas channels 121b are provided on the generator body 121, and the plurality of first fluidizing gas channels 121b are provided at equal intervals around the first gel channel 121a; wherein the first fluidizing gas channel 121b has an opening at the upper end of the generator body 121 along the axial direction, and an opening is provided at the lower end or side wall of the generator body 121 along the axial direction at the lower end of the generator body 121; in this embodiment, the opening of the first fluidizing gas channel 121b at the lower end or side wall of the generator body 121 can be set to be the same, that is, the axial lower ends of the plurality of first fluidizing gas channels 121b are connected to facilitate the reduction of openings and the connection of the fluidizing gas unit. In this embodiment, the connection with the fluidizing gas unit can be achieved by providing a fluidizing gas nozzle 121b1.

[0123] In this embodiment, a plurality of cooling water channels 121c are provided on the generator body 121, and the plurality of cooling water channels 121c are provided at equal intervals around the first gel channel 121a; wherein the upper end of the cooling water channel 121c along the axial direction has an opening at the upper end of the generator body 121, and the lower end thereof along the axial direction has an opening at the lower end or the side wall of the generator body 121; wherein, since the cooling water channel 121c is used for the circulation of cooling water, two cooling water nozzles need to be provided on the generator body 121, one cooling water nozzle is used to achieve communication with part of the cooling water channel 121c, and the other cooling water nozzle is used to achieve communication with other parts of the cooling water channel 121c, and then the two cooling water nozzles can be connected to the cooling unit to facilitate the circulation of cooling water. In this embodiment, along the radial direction of the generator body 121, the distance between the cooling water channel 121c and the first gel channel 121a is greater than the distance between the first fluidizing gas channel 121b and the first gel channel 121a.

[0124] Through the above arrangement, more cooling water channels 121c can be conveniently arranged by arranging the cooling water channels 121c at positions close to the outside of the generator body 121, so as to make the cooling of the generator body 121 more beneficial. In addition, through the arranged cooling water channels 121c, the pressure pulsation phenomenon of the fluidizing gas at the outlet can be reduced by the cooling effect of the introduced cooling water, so as to effectively ensure the working stability of the present invention.

[0125] In this embodiment, the second gel channel 122 a is coaxially arranged with the liquid cap 122 , and a gel distribution member 122 a 1 is provided at one end of the second gel channel 122 a away from the generator body 121 .

[0126] Through the above arrangement, the metal-based gel fuel can be conveniently atomized through the provided gel distribution element 122a1, so that it can be more conveniently mixed with the fluidizing gas, thereby making the mixing more uniform, which is more beneficial to improving the combustion effect of the present invention.

[0127] In this embodiment, the second fluidizing gas channels 122b are arranged in one-to-one correspondence with the first fluidizing gas channels 121b, and the second fluidizing gas channels 122b are arranged at equal intervals around the second gel channel 122a; wherein, in the direction away from the generator body 121, the second fluidizing gas channels 122b are arranged inclined toward the direction close to the second gel channel 122a.

[0128] Through the above-mentioned arrangement, the second fluidizing gas channel 122b is tilted in the direction close to the second gel channel 122a, which can effectively converge the fluidizing gas to the metal-based gel fuel, so that the output metal-based gel fuel and the fluidizing gas can be more conveniently mixed more fully based on the flow action of the fluidizing gas, which is more beneficial to ensuring the mixing effect and combustion effect of the present invention.

[0129] In this embodiment, the mixing channel 123a includes: a first mixing channel portion 123a1 and a second mixing channel portion 123a2 arranged coaxially; wherein, the first mixing channel portion 123a1 and the second mixing channel portion 123a2 are arranged in sequence along the direction away from the liquid cap 122; the first mixing channel portion 123a1 and the second mixing channel portion 123a2 are respectively conical annular channels; in this embodiment, the large diameter end of the second mixing channel portion 123a2 is connected to the small diameter end of the first mixing channel portion 123a1.

[0130] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, an extension tube 1221 is coaxially arranged at one end of the liquid cap 122 away from the generator body 121; wherein, the extension tube 1221 extends into the second mixing channel portion 123a2, and the outer diameter of the extension tube 1221 is smaller than the inner diameter of the second mixing channel portion 123a2; in the present embodiment, the hollow portion of the extension tube 1221 is connected to the second gel channel 122a, and the gel distribution member 122a1 is arranged at one end of the extension tube 1221 extending into the second mixing channel portion 123a2.

[0131] Through the above arrangement, by arranging the extension tube 1221 on the liquid cap 122, an annular channel can be formed between the extension tube 1221 and the second mixing channel part 123a2, so that the fluidizing gas filled in the first mixing channel part 123a1 can pass through the annular channel to achieve full mixing with the metal-based gel fuel. Further, by arranging the first mixing channel part 123a1 and the second mixing channel part 123a2 as conical annular channels respectively, and gradually reducing the radial size along the output direction, the internal fluidizing gas can achieve an increase in flow rate as the cross section decreases, so as to conveniently impact the output metal-based gel fuel, so that it can be effectively atomized. Further, when the fluidizing gas passes through the annular channel between the extension tube 1221 and the second mixing channel part 123a2, as the annular channel becomes a conical channel, the cross section of the changed position is suddenly changed so that the atomized metal-based gel fuel can be further evenly distributed, and finally based on the contraction restriction of the variable cross section of the second mixing channel part 123a2, the concentrated outward output is achieved, effectively ensuring the combustion performance of the present invention.

[0132] like Figure 4 As shown, according to one embodiment of the present invention, the gel distribution member 122a1 is installed on the extension tube 1221 in a detachable manner (such as threaded connection, quick-connect joint). In this embodiment, the gel distribution member 122a1 includes: a gel distribution head 122a11 and a distribution head connection portion 122a12; wherein, the gel distribution head 122a11 and the distribution head connection portion 122a12 are coaxially arranged, so that the distribution head connection portion 122a12 is mutually connected with the end of the extension tube 1221 to achieve the docking connection of the gel distribution head 122a11 and the extension tube 1221. In this embodiment, the coaxial docking of the distribution head connection portion 122a12 and the extension tube 1221 can be achieved by adopting a threaded internal connection method, which can effectively ensure the sealing of the connection position on the one hand, and can also control the screw-in length through the connected thread, so that the position of the gel distribution head 122a11 in the second mixing channel portion 123a2 can be easily adjusted. In this embodiment, in order to facilitate the connection between the gel distribution member 122a1 and the extension tube 1221, the entire gel distribution member 122a1 is a hollow structure, and its distribution head connection part 122a12 is a round tube provided with a connection thread, and the gel distribution head 122a11 is provided with a through hole connected to the distribution head connection part 122a12 at one end, and a gel output hole for gel output at the other end. In this embodiment, the gel distribution head 122a11 and the distribution head connection part 122a12 can be provided as an integral body or as separate bodies, and can be adaptively adjusted according to actual applications.

[0133] Combination Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the gel distribution head 122a11 can be set as a hollow cylindrical structure, the lower end opening of which is connected to the distribution head connection part 122a12, and a gel output hole is set on the upper end plane or circumferential direction thereof, wherein, if the gel output hole is distributed on the upper end plane of the gel distribution head 122a11, the gel output hole can be arranged in a centrally arranged manner, wherein, in order to effectively ensure the reliability of gel output and avoid blockage, a circular hole with an aperture of 1 mm can be used (it should be noted that the aperture of the gel output hole can be set according to the specific actual situation and is not limited to the above size), if the gel output hole is set on the circumferential side wall of the gel distribution head 122a11, there can be multiple (for example, two, three, etc.) distributed along the circumference of the gel distribution head 122a11; wherein, the axial direction of the gel output hole is consistent with the radial direction of the gel distribution head 122a11, or, the axial direction of the gel output hole is inclined upward relative to the radial direction of the gel distribution head 122a11, see Figure 4. Among them, the circumferentially arranged gel output holes are arranged adjacent to the upper end of the gel distribution head 122a11 so that they can be closer to the outlet position of the annular channel formed by the gel distribution head 122a11 and the second mixing channel part 123a2, which can be beneficial to the impact atomization of the gel and reduce the back pressure of the airflow on the gel output holes to facilitate the output of the gel. Of course, when the axial direction of the gel output hole is inclined upward relative to the radial direction of the gel distribution head 122a11, the gel output hole can be arranged at the connection position between the upper end surface and the outer side surface of the gel distribution head 122a11, thereby making the position of the gel output hole closest to the outlet position of the annular channel, which is easier to reduce the back pressure of the airflow on the one hand, and more conducive to the full atomization of the gel by utilizing the changes of the airflow when passing through the flow channel on the other hand. In addition, since the flow rate of the gel output has certain limitations, for this reason, the number, caliber and wall thickness of the circumferentially arranged gel output holes of the gel distribution head 122a11 can be adjusted according to actual needs while ensuring the gel output flow rate and no blockage, which will not be repeated here.

[0134] According to the above arrangement, since the second mixing channel portion 123a2 is a conical annular channel, when the gel distribution head 122a11 is a cylindrical structure, after it extends into the second mixing channel portion 123a2, the annular interval between the gel distribution head 122a11 and the second mixing channel portion 123a2 gradually decreases in the outlet direction, and the cross-section suddenly increases at the end position of the gel distribution head 122a11. Therefore, when the airflow passes through the gel distribution head 122a11, the airflow velocity is effectively increased. If the gel output hole is located at the gel distribution head 122a11, the gel distribution head 122a11 is provided with a plurality of holes. When the 2a11 is arranged circumferentially, the impact on the gel can be effectively increased based on the increase in the air flow velocity to improve its atomization ability. When passing through the annular channel, the cross-sectional mutation causes the air flow velocity to slow down and generate turbulence to achieve contact with the gel output at the end position of the gel distribution head 122a11, thereby achieving the effect of atomizing the end gel. Therefore, based on the selective distribution of the gel output holes at the end position or side position of the gel distribution head 122a11, the degree of gel atomization can be flexibly and conveniently optimized, making the working performance of the present invention better. Of course, the length of the gel distribution head 122a11 extending into the second mixing channel part 123a2 can also be adjusted to control its air flow and air flow velocity, so as to effectively match its atomization ability of the gel.

[0135] Through the above-mentioned arrangement, the gel distribution head 122a11 of the present invention can flexibly set the position and number of gel output holes on the end face or side face, and control the size of the gel output holes to effectively reduce the back pressure generated at the position of the gel distribution head 122a11 when the airflow passes through, which is beneficial to the smooth output of the gel.

[0136] Combination Figure 5 and Figure 6 As shown, according to another embodiment of the present invention, the gel distribution head 122a11 can be set as a hollow trapezoidal boss-like structure, the lower end opening of which is connected to the distribution head connecting portion 122a12, and a gel output hole is set on its upper end plane or circumference. If the gel output hole is distributed on the upper end plane of the gel distribution head 122a11, the gel output hole can be arranged in a centrally arranged manner. In order to effectively ensure the reliability of gel output and avoid blockage, a circular hole with an aperture of 1 mm can be used. Accordingly, in order to facilitate the atomization of the gel, the diameter of the upper end plane of the gel distribution head 122a11 can be made consistent with the diameter of the gel output hole, so that the output gel can flow and distribute around along the edge to achieve relative to the incoming flow and thus achieve the effect of impact atomization. If the gel output hole is arranged on the circumferential side wall of the gel distribution head 122a11, there may be a plurality of (e.g., two, three, etc.) gel output holes distributed along the circumference of the gel distribution head 122a11; wherein the axial direction of the gel output hole is arranged perpendicular to the side wall of the gel distribution head 122a11, see Figure 6 Alternatively, the axial direction of the gel output hole is inclined upward relative to the side wall of the gel distribution head 122a11, and its arrangement is consistent with the arrangement of the aforementioned cylindrical gel distribution head 122a11, which will not be repeated here.

[0137] In this embodiment, the inclination angle of the outer side surface of the gel distribution head 122a11 can be consistent with the inclination angle of the inner side surface of the second mixing channel part 123a2, thereby making the cross section of the annular flow channel between the gel distribution head 122a11 and the second mixing channel part 123a2 constant, thereby facilitating the constant transportation of the airflow. Of course, the inclination angle of the outer side surface of the gel distribution head 122a11 can be inconsistent with the inclination angle of the inner side surface of the second mixing channel part 123a2, thereby controlling the annular channel formed between them to present a gradually changing cross-sectional shape, wherein the preferred form is to gradually reduce the cross section of the annular channel, thereby being more suitable for the gel distribution head. The spacing between the circumferentially distributed gel output holes 122a11 at the small diameter end becomes smaller. Specifically, since the gel distribution head 122a11 is a trapezoidal boss-like structure, the circumferential length of the small diameter end thereof is gradually reduced, so that the closer the multiple rows of equally spaced gel output holes are to the small diameter end, the smaller the spacing. Therefore, this dense distribution is more suitable for faster air flow rates to fully realize the impact atomization effect of the gel and the incoming flow, and after passing through the small diameter end of the gel distribution head 122a11, it will enter a channel with a suddenly increased cross-section, thereby allowing the atomized gas to present a turbulent mixing effect, and more fully realizing the uniform distribution of the gel in the atomized gas, thereby making the atomization process simpler and more sufficient.

[0138] Furthermore, in the present embodiment, a guide groove may be further provided on the side wall of the gel distribution head 122a11, and the guide groove corresponds to the provided gel output hole. On the one hand, the wall thickness at the position where the gel output hole is provided may be reduced by the provided guide groove, so that the passing distance of the gel is effectively reduced, and the contact with the incoming flow may be achieved more quickly to reduce blockage. On the other hand, the airflow may be guided by the provided guide groove, so that the passing airflow is in full contact with the output gel to ensure the gel atomization effect and the stability of the output direction after atomization. On the other hand, the provided guide groove may effectively increase the flow channel area at some positions, and the blockage of the flow channel may be effectively avoided. In addition, the provided guide groove may also impose certain restrictions on the airflow distribution and flow at the circumferential position in the annular flow channel to achieve partial separation of the atomized gas and the remaining airflow, which is more beneficial to ensuring the smooth flow of the flow channel, thereby more beneficially reducing the restriction on the length of the gel distribution head 122a11 extending into the second mixing channel portion 123a2.

[0139] Furthermore, the guide groove can be set as a linear groove or a spiral groove. By setting the guide groove as a spiral groove, the flow direction of the atomized gel can be spirally guided, so that the atomized gel can have a certain flow direction when passing through the gel distribution head 122a11, so as to reduce the relative impact between the atomized gel output in the radial direction, and realize the orderly mixing of the atomized gel after passing through the annular flow channel, which is beneficial to ensure the uniform distribution of the atomized gel.

[0140] Furthermore, in the present embodiment, a cutting piece 122a11a may be further provided on the side wall of the gel distribution head 122a11. The cutting piece is arranged along the axial direction of the gel output hole, and extends from the inner wall of the gel distribution head 122a11 to the outer wall, and may protrude from the outer wall as required, so that the gel output hole is divided into a plurality of parts by the provided cutting piece 122a11a, so as to achieve shear thinning of the output gel, so as to ensure that the gel has sufficient fluidity when impacted by the incoming flow, so as to further promote the full impact atomization effect; wherein, in order to avoid clogging of the gel output hole, the opening area of ​​the gel output hole may be relatively increased to eliminate the occupancy of the cutting piece 122a11a. Of course, a cutting piece 122a11a with a smaller thickness may also be selected to achieve the corresponding effect.

[0141] Furthermore, the cutting blade 122a11a is arranged parallel to the axial direction of the gel distribution head 122a11, so as to achieve shear thinning effect on the gel. The downward flow distribution of the gel can be achieved through the surface of the cutting blade 122a11a, so that the flow and spreading of the gel can be easily achieved on the surface of the cutting blade 122a11a, which is more beneficial to increase the contact between the airflow and the flowing gel when flowing, and is further beneficial to refining the atomized particles.

[0142] Furthermore, a shear thinning member for shearing the gel can be further provided in the hollow part of the gel distribution head 122a11, wherein the shape of the shear thinning member matches the shape of the hollow part of the gel distribution head 122a11, and the shear thinning member is provided with channels distributed in an array, wherein, taking a rectangular channel as an example, the rectangular channels are distributed along the axial direction of the shear thinning member, and are arranged in a rectangular array, so that the partition walls between the rectangular channels can achieve shear thinning of the introduced gel, and then, the thickness of the partition walls that play a shearing role can be adjusted by flexibly setting the spacing of the rectangular channels, which effectively simplifies the structural complexity of the present scheme and optimizes the reliable flow of the gel; of course, according to needs, the rectangular channels can be staggered at a preset distance in the shear thinning member along the gel conveying direction to achieve that the gel will be continuously sheared by the staggered partition walls when flowing along the staggered rectangular channels, so as to achieve a continuous shearing effect. In addition, the shear thinning member can be arranged in the gel distribution head 122a11 according to needs, and can be specifically determined based on the flow and thinning degree of the gel.

[0143] According to another embodiment of the present invention, the gel distribution head 122a11 can be set as a hollow conical structure, the lower end opening of which is connected to the distribution head connection part 122a12, and a gel output hole is set on the side wall thereof, wherein a plurality of gel output holes are distributed along the circumference of the gel distribution head 122a11, and the gel output holes are adjacent to the tip position of the gel distribution head 122a11. In this embodiment, the inclination angle of the outer side surface of the gel distribution head 122a11 can be consistent with the inclination angle of the inner side surface of the second mixing channel part 123a2, thereby making the cross section of the annular flow channel between the gel distribution head 122a11 and the second mixing channel part 123a2 constant, thereby facilitating the constant transportation of the airflow. Of course, the inclination angle of the outer side surface of the gel distribution head 122a11 can be inconsistent with the inclination angle of the inner side surface of the second mixing channel part 123a2, thereby controlling the annular channel formed between them to present a uniform cross section. The cross-sectional shape gradually changes, wherein the cross-sectional shape of the annular channel is preferably gradually reduced, thereby being more adaptable to the situation where the intervals of the gel output holes distributed circumferentially at the small diameter end of the gel distribution head 122a11 become smaller. Specifically, since the gel distribution head 122a11 is a conical structure, the circumferential length of its tip is very small, so that the closer the multiple rows of gel output holes arranged at equal intervals are to the small diameter end, the smaller the intervals are, and thus this dense distribution is more adaptable to faster air flow rates to fully achieve the impact atomization effect of the gel and the incoming flow. Of course, since the tip of the conical structure does not have a sudden change in cross section, for this reason, it can also be adopted to change its inclination angle and axial length so that the second mixing channel part 123a2 from the annular flow channel to the front end always presents a gradually increasing cross section, thereby achieving the turbulence phenomenon caused by the sudden change in cross section during the output of the atomized gel, so that the output process of the atomized gel is always stable, and at the same time, the relative impact of the atomized gel generated at different positions in the circumferential direction at the sudden change position at the end of the gel distribution head 122a11 is eliminated, so that the entire output process of the atomized gel is more stable.

[0144] Furthermore, in this embodiment, a cutting piece 122a11a may be further provided on the side wall of the gel dispensing head 122a11, and the cutting piece is consistent with the above-mentioned method and will not be described in detail here.

[0145] Furthermore, a shear thinning member for shearing the gel may be further provided in the hollow portion of the gel distributing head 122a11. This arrangement is consistent with the aforementioned arrangement, and the only difference is the shape of the adapted hollow portion, which will not be described in detail here.

[0146] Combination Figure 7 and Figure 8As shown, according to another embodiment of the present invention, the gel distribution head 122a11 can be set as a hollow hemispherical structure, the lower end opening of which is connected to the distribution head connection part 122a12, and a gel output hole is set at its upper end or circumferentially. If the gel output hole is distributed at the upper end of the gel distribution head 122a11, the gel output hole can be arranged in a centrally arranged manner, wherein, in order to effectively ensure the reliability of gel output and avoid blockage, a circular hole with an aperture of 1 mm can be used (it should be noted that the aperture of the gel output hole can be set according to the specific actual situation and is not limited to the above size), so that the output gel can flow and distribute along the edge along the curved surface to the surroundings, so as to achieve the effect of impact atomization relative to the incoming flow. If the gel output hole is set on the circumferential side wall of the gel distribution head 122a11, there can be multiple (for example, two, three, etc.) distributed along the circumference of the gel distribution head 122a11; wherein, the axial direction of the gel output hole is perpendicular to the side wall of the gel distribution head 122a11, see Figure 8 , or, the axial direction of the gel output hole is inclined upward relative to the side wall of the gel distribution head 122a11. Among them, the circumferentially arranged gel output holes are arranged adjacent to the upper end of the gel distribution head 122a11 so that they can be closer to the outlet position of the annular channel formed by the gel distribution head 122a11 and the second mixing channel part 123a2, which can be beneficial to the impact atomization of the gel, and reduce the back pressure of the airflow on the gel output hole to facilitate the output of the gel. In addition, since the flow rate of the gel output has certain limitations, for this reason, while ensuring the gel output flow rate and non-blocking, the number, caliber and wall thickness of the circumferentially arranged gel output holes of the gel distribution head 122a11 can be adjusted according to actual needs, and will not be repeated here. In this embodiment, the matching with the second mixing channel part 123a2 can be achieved by controlling the radius of the hemispherical structure. Therefore, the annular channel formed between the gel distribution head 122a11 and the second mixing channel part 123a2 presents a cross-sectional shape that gradually decreases and then gradually increases. Therefore, it is more suitable to flexibly arrange the gel output holes in the gel distribution head 122a11 to achieve a state matching the annular flow channel. In addition, by setting the gel distribution head 122a11 in a hemispherical structure, it does not have a state where the flow channel cross-section suddenly changes at the end, so that the atomized gel can be more stably guided to mix in the second mixing channel part 123a2, thereby achieving the stability of the atomized gel mixing process.

[0147] Furthermore, in this embodiment, a guide groove may be further provided on the side wall of the gel dispensing head 122a11. The arrangement of the guide groove is consistent with the above-mentioned arrangement and will not be described in detail herein.

[0148] Further, the guide groove can be configured as a linear groove or a spiral groove (see Fig. 9), wherein, by setting the guide groove as a spiral groove, the flow direction of the atomized gel can be spirally guided, so that the atomized gel can have a certain flow direction when passing through the gel distribution head 122a11, so as to reduce the relative impact between the atomized gel output in the radial direction, and realize the orderly mixing of the atomized gel after passing through the annular flow channel, which is beneficial to ensure the uniform distribution of the atomized gel.

[0149] Furthermore, in this embodiment, when the gel output hole is arranged on the side wall of the gel distribution head 122a11, a cutting piece 122a11a can be further arranged on the side wall of the gel distribution head 122a11. The arrangement method of the cutting piece is consistent with the above-mentioned method and will not be repeated here.

[0150] Furthermore, a shear thinning member for shearing the gel may be further provided in the hollow portion of the gel distributing head 122a11. The disposition method of the shear thinning member is consistent with the above-mentioned method and will not be described in detail here.

[0151] According to another embodiment of the present invention, if a guide groove is provided on the gel distribution head 122a11, the depth of the guide groove at different positions can be further controlled to achieve the impact of the airflow and the gel output hole, so as to achieve the desired atomization effect. For example, along the direction from the distribution head connecting portion 122a12 of the gel distribution head 122a11 to the gel distribution head 122a11, the depth of the guide groove gradually becomes shallower, so that the gel can be distributed along the guide groove after being output from the gel output hole, while the gel in the guide groove is distributed more at a deeper position and less at a front position. Therefore, since the area at the shallower position is smaller, the flow rate can be relatively faster, so that the gel with less distribution can be better atomized and brought out, and the gel with more distribution at the bottom can also achieve a larger area of ​​contact with the incoming flow, so that it can move along the flow channel under the action of the airflow to be accelerated and brought out through the shallower position, thereby making the present invention have a better gel atomization effect.

[0152] like Figure 2 As shown, according to one embodiment of the present invention, the distance between the outlet at the upper end of the spray generator 12 and the upper surface of the porous furnace plate 114 is 230-260 mm.

[0153] Through the above settings, it can be effectively ensured that the premixed gas has enough space to react completely, providing a stable and uniform thermal coflow environment for gel spray combustion; in addition, in addition to cooling water protection, the appropriate height can also reduce the impact of high temperature in the thermal environment on the fluidizing gas.

[0154] Combination Figure 1 and Figure 2As shown, according to one embodiment of the present invention, the combustion observation hood 13 is a hollow hood body with an opening at the lower end, which includes: an observation hood body 131 and a quartz glass plate 132; wherein the observation hood body 131 can be set as a rectangular hollow box body, which is made of a stainless steel plate. In this embodiment, a mounting window is provided on the side wall of the observation hood body 131, and the quartz glass plate 132 is mounted on the mounting window. In this embodiment, a threaded connector is used at the lower end of the combustion observation hood 13 to achieve a fixed connection with the upper end of the furnace body upper part 112, so as to achieve communication with the hollow part of the furnace body 11, so as to facilitate the full combustion of the fuel therein.

[0155] like Figure 1 As shown, according to one embodiment of the present invention, the gel supply unit 2 includes: a support 21, a syringe 22 supported on the support 21, and an extrusion assembly 23. In this embodiment, the volume of the syringe 22 is 30 to 100 mL. The syringe 22 is used to contain the metal-based gel fuel, and the extrusion assembly 23 is connected to the syringe 22 to achieve accurate control of the output of the metal-based gel fuel.

[0156] like Fig.10 As shown, in this embodiment, the syringe 22 includes: an injection tube body 221 for storing gel, a piston rod 222 for squeezing gel, and a thinning structure 223 installed in the injection tube body 221; wherein the thinning structure 223 includes: a plurality of crossed thinning shear plates 2231; wherein the thinning structure 223 is coaxially installed in the injection tube body 221, and when the piston rod 222 squeezes the gel that is initially solid, the gel is cut by the thinning shear plates 2231 under pressure to achieve thinning from solid to fluid. In this embodiment, in order to control the degree of thinning, the number of thinning structures 223 provided can be controlled, and the thinning shear plates 2231 of adjacent thinning structures 223 are staggered, thereby effectively achieving gel processing while avoiding increasing resistance during the feeding process.

[0157] In this embodiment, the syringe 22 also includes: an exchange structure 224 for changing the position of the gel; wherein the exchange structure 224 can be set as a spiral blade, and in the output direction of the gel, the thinning structure 223 and the exchange structure 224 are arranged in sequence, so that the thinned gel can achieve the change of the gel position under the action of the thinning structure 223, thereby avoiding the sedimentation of effective ingredients such as metal-based particles in the gel in a single direction (for example, when the syringe 22 is placed horizontally, the particles will settle in the direction of gravity), so as to effectively ensure the uniform distribution of substances in the gel. Fig.11As shown, in another embodiment, the exchange structure 224 can be set as two spiral tubes, which are installed on the outlet end of the injection tube body 221, and the positions of the inlets and outlets of the two spiral tubes are exchanged to achieve the position exchange when the gel is output.

[0158] In this embodiment, the extrusion assembly 23 includes: a slider, a screw and a motor; wherein the slider is arranged to abut against the telescopic end of the syringe 22, and then under the driving action of the motor, the slider moves linearly along the screw, thereby achieving accurate control of the extrusion of the syringe 22.

[0159] According to one embodiment of the present invention, in order to further maintain the fluidity of the gel in the first gel channel 121a and the second gel channel 122a, a structural member for maintaining the thinning degree can be further selectively arranged in the first gel channel 121a and the second gel channel 122a, and the structural member is consistent with the structure of the aforementioned thinning structural member 223, so as to effectively improve the versatility of the parts and reduce the production cost, which is not elaborated here.

[0160] like Figure 1 As shown, according to one embodiment of the present invention, the data acquisition unit 3 includes: a camera 31, a spectrometer 32, a spring sampler 33, a water-cooled probe 34 and a flue gas analyzer 35; wherein the camera 31 and the spectrometer 32 are respectively arranged opposite to the quartz glass plate 132, and are used to collect spectrum information and flame images of the metal-based gel spray combustion process; the spring sampler 33 and the water-cooled probe 34 are respectively connected to the observation cover body 131. In this embodiment, the flue gas analyzer 35 is connected to the water-cooled probe 34.

[0161] In this embodiment, the spectrometer 32 is provided with a collimating lens for enhancing the spectral signal.

[0162] Combination Figure 1 and Fig.12 As shown, in this embodiment, the spring sampler 33 is installed on the observation cover body 131 through the mounting hole on the observation cover body 131, wherein the spring sampler 33 is a nitrogen extrusion sampling rod, which can be inserted into the combustion flame by passing 3s of nitrogen, and then automatically retracted under the action of the spring after the nitrogen is turned off to obtain the sampling product. In this embodiment, the spring sampler 33 is provided with a groove for expanding the contact area with the metal particles, wherein a conductive glue can be further arranged in the groove of the spring sampler 33 to better collect the condensed phase particles, so as to realize rapid offline detection.

[0163] Combination Figure 1 and Fig.13As shown, according to one embodiment of the present invention, the water-cooled probe 34 includes: a filter tube 341, a filter membrane 342, a water-cooling tube 343, a cooling water inlet 344 and a cooling water outlet 345; wherein the water-cooled probe 34 is cylindrical as a whole, with a gas passage in the middle and a slot at one end, and the filter tube 341 is inserted from the slot to fix the filter membrane 342, thereby reducing the blockage of the probe by particulate matter. The water-cooling tube has a built-in circulating cooling water passage, which is connected to an external circulating cooling water pump through a nozzle, so that the flue gas temperature can be controlled at about 400K, reducing the damage of high-temperature flue gas to the flue gas meter probe, and then collecting flue gas at different positions and at different times during the spray combustion process. At the same time, a filter membrane 342 is provided to reduce the blockage of the probe by condensed phase particles.

[0164] In this embodiment, the diameter of the water-cooled probe 34 is 4 mm.

[0165] To further illustrate the present invention, the experimental process of the present invention is further described.

[0166] The required flow rate of each gas component (methane, air, oxygen) in the premixed gas is set by the gas mass flow controller in the premixed gas unit, and the valve is opened so that each gas component enters the furnace body 11 through the premixed gas distributor 115, and then passes through the rectifying baffle 113, the lower zirconia bead structure, the upper zirconia bead structure, and the porous furnace plate 114 before being ejected, and then ignited by the spark plug 116, so as to generate a high-temperature laminar flame;

[0167] After the premixed gas combustion is stable (about 25s), open the valve of the fluidizing gas unit, and then open the gel supply unit 2, input the gel and fluidizing gas into the spray generator 12 together, and the atomized metal-based gel fuel is atomized and mixed under the action of the fluidizing gas, and ignited and burned in the high-temperature laminar flame; in this embodiment, when gel blockage occurs, the output torque of the stepper motor reaches a balance with the opposing torque, the stepper motor stops working and is in a non-triggered state, thereby outputting a signal for judging the operating state, so that subsequent devices will not be triggered.

[0168] Turn on the camera 31, spectrometer 32 and flue gas analyzer in the data acquisition unit 3 to record the metal-based gel spray combustion flame image, spectrum information and gaseous products;

[0169] Open the nitrogen valve and push the spring sampler 33 into the flame range for 3 seconds, then close the nitrogen valve. The spring sampler 33 will evacuate the high-temperature flame zone under the action of the spring to obtain the condensed phase particle combustion products and carry out subsequent offline detection and analysis.

[0170] In this embodiment, by adjusting the premixed gas ratio, a high-temperature hot gas environment with controllable components can be created for gel spray combustion. The typical operating conditions in the test are shown in Table 1.

[0171] Table 1

[0172]

[0173] The obtained flame image of the boron-containing gel spray combustion is as follows Fig.14 As shown, the morphology of the intermediate products of boron particle combustion is as follows Fig.15 shown.

[0174] From the above, it can be seen that the spray combustion test device provided by the present invention can better realize gel atomization and successfully ignite in a high-temperature thermal environment. It can obtain the flame morphology of the gel spray combustion process, the spectral information of the gaseous products and intermediate products, and can sample and analyze the condensed phase particles, so as to deeply understand the metal-based gel spray combustion characteristics, especially the combustion mechanism of the metal particles in the spray, lay the foundation for the efficient combustion of metal-based gels and reduce pollution emissions, and provide guidance for the rational design of the overall design of the gel engine.

[0175] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0176] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A spray combustion test device for metal-based gel fuel, characterized in that: include: A combustion unit (1), a gel supply unit (2), a premixing gas unit, a fluidizing gas unit, a cooling unit and a data acquisition unit (3) connected to the combustion unit (1); The combustion unit (1) comprises: a furnace body (11), a spray generator (12) and a combustion observation cover (13); The combustion observation cover (13) and the furnace body (11) are coaxially arranged and communicate with each other, and the combustion observation cover (13) is located on the upper side of the furnace body (11); The spray generator (12) is connected to the bottom of the furnace body (11), and the spray generator (12) and the furnace body (11) extend into the furnace body (11) coaxially with each other; The premixing unit is connected to the furnace body (11); The gel supply unit (2) and the fluidizing gas unit are respectively connected to the spray generator (12); The cooling unit is respectively connected to the spray generator (12) and some modules of the data acquisition unit (3); The data acquisition unit (3) is connected to the combustion observation hood (13).

2. The spray combustion test device according to claim 1, characterized in that: The furnace body (11) comprises: a furnace body lower part (111), a furnace body upper part (112), a rectifying baffle (113), a porous furnace plate (114), a premixed gas distributor (115) and a spark plug (116); The furnace body upper part (112), the porous furnace plate (114) and the furnace body lower part (111) are connected and arranged in sequence from top to bottom; The rectifying baffle (113) is arranged in the lower part (111) of the furnace body, and the rectifying baffle (113) and the porous furnace plate (114) are arranged with a spacing; The premixed gas distributor (115) is installed on the side wall of the lower part (111) of the furnace body, and the position where the premixed gas distributor (115) is connected to the lower part (111) of the furnace body is located below the rectifying baffle (113); The spark plug (116) is mounted on the side wall of the furnace body upper portion (112).

3. The spray combustion test device according to claim 2, characterized in that: The furnace body lower part (111) comprises: a lower cylinder (111a), a cylinder bottom plate (111b) arranged at the bottom end of the lower cylinder (111a), and a positioning support cylinder (111c) arranged on the upper side of the cylinder bottom plate (111b); The cylinder bottom plate (111b) is a hollow annular plate, the outer side surface of which is fixedly connected to the inner side surface of the bottom end of the lower cylinder (111a); The positioning support cylinder (111c) is a hollow cylinder with openings at both ends, and its bottom end is fixedly connected to the upper side of the cylinder bottom plate (111b), and the hollow part of the positioning support cylinder (111c) and the hollow part of the cylinder bottom plate (111b) are interconnected to form an interlocking channel for installing the spray generator (12).

4. The spray combustion test device according to claim 3, characterized in that: The rectifying baffle (113) is an annular plate as a whole, and its radial inner side edge is connected to the outer side of the positioning support cylinder (111c) by being nested with each other, and its radial outer side edge is connected to the inner side of the lower cylinder (111a) by being nested with each other; The rectifying baffle (113) is regularly provided with a plurality of rectifying holes; The porous furnace plate (114) comprises: an annular furnace plate body (114a), a first furnace plate support (114b) arranged inside the annular furnace plate body (114a), and a second furnace plate support (114c) arranged outside the annular furnace plate body (114a); The first furnace plate support (114b) is supported on the upper end of the positioning support cylinder (111c), and the second furnace plate support (114c) is arranged between the furnace body lower part (111) and the furnace body upper part (112); The annular furnace plate main body (114a) is regularly provided with a plurality of gas holes.

5. The spray combustion test device according to claim 4, characterized in that: An upper layer of zirconia bead structure and a lower layer of zirconia bead structure are arranged on the upper side of the rectifying baffle (113); The position where the premixed gas distributor (115) is connected to the lower part (111) of the furnace body is below the rectifying baffle (113); The diameter of the rectifying hole of the rectifying baffle (113) is smaller than the diameter of the zirconium oxide beads in the lower layer of the zirconium oxide bead structure; The diameter of the gas through holes on the annular furnace plate main body (114a) is 0.8-1.0 mm, and the center distance between adjacent gas through holes is 1.2-1.7 mm.

6. The spray combustion test device according to claim 5, characterized in that: The upper part (112) of the furnace body is a hollow cylinder with openings at two opposite ends. The premixed gas distributor (115) comprises: a hollow distribution ring (115a), a connecting pipe (115b) arranged radially inside the distribution ring (115a), and a premixed gas nozzle (115c) arranged radially outside the distribution ring (115a); A plurality of connecting pipes (115b) are arranged at regular intervals along the circumference of the distribution ring (115a), and the connecting pipes (115b) are respectively connected to the lower cylinder (111a).

7. The spray combustion test device according to claim 6, characterized in that: The spray generator (12) comprises: a generator body (121), a liquid cap (122), an air cap (123) and a sealing cap (124); From top to bottom, the air cap (123), the liquid cap (122) and the generator body (121) are coaxially connected in sequence; The sealing cap (124) is connected to the upper end of the generator body (121) and is used to seal the air cap (123) and the liquid cap (122) in the hollow part thereof; The generator body (121) is in an overall cylindrical structure, and a first gel channel (121a), a first fluidizing gas channel (121b) and a cooling water channel (121c) are provided in the generator body (121); The first gel channel (121a) is connected to the gel supply unit (2); The first fluidizing gas channel (121b) is connected to the fluidizing gas unit; The cooling water channel (121c) is connected to the cooling unit; The liquid cap (122) is in a columnar structure as a whole, and a second gel channel (122a) and a second fluidizing gas channel (122b) are provided in the liquid cap (122); The air cap (123) is in a columnar structure as a whole, and a mixing channel (123a) is provided in the liquid cap (122); The second gel channel (122a) is connected to the first gel channel (121a); The second fluidizing gas channel (122b) is connected to the first fluidizing gas channel (121b); The mixing channel (123a) is respectively connected to the second gel channel (122a) and the second fluidizing gas channel (122b); The cooling water channel (121c) is communicated with the hollow portion of the sealing cap (124) to supply cooling water to the air cap (123) and the liquid cap (122).

8. The spray combustion test device according to claim 7, characterized in that: The first gel channel (121a) is coaxially arranged with the generator body (121), and axially penetrates two opposite ends of the generator body (121); A plurality of the first fluidizing gas channels (121b) are arranged on the generator body (121), and the plurality of the first fluidizing gas channels (121b) are arranged at equal intervals around the first gel channel (121a); ​​wherein the upper end of the first fluidizing gas channel (121b) along the axial direction has an opening at the upper end of the generator body (121), and the lower end thereof along the axial direction has an opening at the lower end or the side wall of the generator body (121); A plurality of cooling water channels (121c) are provided on the generator body (121), and the plurality of cooling water channels (121c) are arranged at equal intervals around the first gel channel (121a); ​​wherein the upper end of the cooling water channel (121c) along the axial direction has an opening at the upper end of the generator body (121), and the lower end thereof along the axial direction has an opening at the lower end or the side wall of the generator body (121); Along the radial direction of the generator body (121), the distance between the cooling water channel (121c) and the first gel channel (121a) is greater than the distance between the first fluidizing gas channel (121b) and the first gel channel (121a); The second gel channel (122a) is coaxially arranged with the liquid cap (122), and a gel distribution piece (122a1) is provided at one end of the second gel channel (122a) away from the generator body (121); The second fluidizing gas channels (122b) are arranged in one-to-one correspondence with the first fluidizing gas channels (121b), and the second fluidizing gas channels (122b) are arranged at equal intervals around the second gel channel (122a); Along the direction away from the generator body (121), the second fluidizing gas channel (122b) is arranged to be inclined toward the direction close to the second gel channel (122a); The mixing channel (123a) comprises: a first mixing channel portion (123a1) and a second mixing channel portion (123a2) which are coaxially arranged; Along the direction away from the liquid cap (122), the first mixing channel portion (123a1) and the second mixing channel portion (123a2) are arranged in sequence; The first mixing channel portion (123a1) and the second mixing channel portion (123a2) are respectively conical annular channels; The large diameter end of the second mixing channel portion (123a2) is connected to the small diameter end of the first mixing channel portion (123a1).

9. The spray combustion test device according to claim 8, characterized in that: An extension tube (1221) is coaxially arranged at one end of the liquid cap (122) away from the generator body (121); The extension tube (1221) extends into the second mixing channel portion (123a2), and the outer diameter of the extension tube (1221) is smaller than the inner diameter of the second mixing channel portion (123a2); The hollow portion of the extension tube (1221) is connected to the second gel channel (122a), and the gel distribution member (122a1) is arranged at one end of the extension tube (1221) extending into the second mixing channel portion (123a2).

10. The spray combustion test device according to claim 9, characterized in that: The combustion observation cover (13) is a hollow cover body with an opening at the lower end, and comprises: an observation cover body (131) and a quartz glass plate (132); The side wall of the observation cover body (131) is provided with an installation window, and the quartz glass plate (132) is installed on the installation window; The gel supply unit (2) comprises: a support (21), a syringe (22) and an extrusion assembly (23) supported on the support (21); The syringe (22) is used to contain metal-based gel fuel, and the extrusion assembly (23) is connected to the syringe (22); The data acquisition unit (3) comprises: a camera (31), a spectrometer (32), a spring sampler (33), a water-cooled probe (34) and a flue gas analyzer (35); The camera (31) is arranged opposite to the quartz glass plate (132); The spectrometer (32), the spring sampler (33), and the water-cooled probe (34) are respectively connected to the observation cover body (131); The flue gas analyzer (35) is connected to the water-cooled probe (34).

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