CN114459024B - Flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible adjustment - Google Patents

Abstract

The invention relates to a flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow, which comprises: the fuel can be sprayed out after being atomized by the cyclone atomizer, the axial concurrent air inlet pipe and the axial countercurrent air inlet pipe are arranged on the axial air flow mixing section, the axial direction of the axial concurrent air inlet pipe and the axial direction of the axial countercurrent air inlet pipe are tangential to the outer circumferential surface of the axial air flow mixing section, the communication position of the axial concurrent air inlet pipe and the axial air flow mixing cavity and the communication position of the axial countercurrent air inlet pipe and the axial air flow mixing cavity are staggered along the axial direction of the axial air flow mixing section, the rotation directions of the axial concurrent air and the axial countercurrent air are opposite, and the flow ratio of the air flow in the axial concurrent air inlet pipe to the air flow in the axial countercurrent air inlet pipe is 100 percent: 0% to 0%: variation between 100%. The rotational flow direction and the rotational flow strength of the air flow in the axial air flow mixing cavity can be continuously and flexibly adjusted by adjusting the flow ratio of the forward air flow to the reverse air flow.

Description

Flame synthesis burner that can realize flexible adjustment of axial and tangential combined swirl

technical field

The invention relates to the technical field of nanomaterial synthesis, in particular to a flame synthesis burner capable of flexibly adjusting axial and tangential combined swirl flow.

Background technique

Nanomaterials have the characteristics of small particle size, large specific surface area, etc., and they have excellent optical and electrical properties, so they have been widely used in many fields. At present, the synthesis of nanoparticles mainly adopts the methods of chemical synthesis and flame synthesis. Compared with the chemical synthesis method, the nanoparticles obtained by the flame synthesis method have the characteristics of one-step synthesis, high purity, and good particle size controllability. The synthesis of powder materials has broad application prospects.

Among various flame synthesis combustion technologies, the burner is the key equipment for flame synthesis. In the swirling flame synthesis burner, the swirling characteristics of the gas flow and the swirling construction method have a great influence on the shape of the nano-powder particles. However, in the current swirling flame synthesis burner, it is necessary to adjust the angle of the swirling blades to adjust the swirling characteristics and swirling intensity of the incident airflow. Continuous adjustment of flow vane angle. Therefore, it is necessary to develop a swirl flame synthesis burner structure that also has high flexibility and controllability and a relatively simple structure.

Contents of the invention

Based on this, the present invention proposes a flame synthesizing burner that can realize the flexible adjustment of axial and tangential combined swirling flow. The swirl direction and swirl intensity of the airflow in the tangential airflow mixing chamber can be continuously and flexibly adjusted to improve the dynamic adjustment ability of the high-temperature reflow zone constructed, so as to realize the flexible regulation of the particle size, shape and crystal phase of the synthesized nanoparticles. And improve the yield and production efficiency of the flame synthesis of nanoparticles. In addition, the flame synthesizing burner that can realize the flexible adjustment of axial and tangential combined swirl does not need to install more complicated structures such as swirl blades and external actuators, the overall structure is simpler, and the manufacturing cost and difficulty are lower.

Flame synthesis burners that can realize flexible adjustment of axial and tangential combined swirl flow, including:

Axial airflow mixing section. An axial airflow mixing chamber is arranged inside the axial airflow mixing section. A swirl atomizer is installed in the axial airflow mixing chamber, and the fuel can be atomized by the swirl atomizer. The axial flow air inlet pipe and the axial counterflow air inlet pipe communicated with the axial air flow mixing chamber are installed on the axial air flow mixing section, the axial direction of the axial flow air inlet pipe, the The axial direction of the axial counterflow inlet pipe is tangent to the outer peripheral surface of the axial airflow mixing section, and the communication position between the axial forward flow inlet pipe and the axial airflow mixing chamber, the axial counterflow inlet pipe The communication position with the axial airflow mixing chamber is staggered along the axial direction of the axial airflow mixing section, and the air flowing into the axial airflow mixing chamber through the axial forward flow inlet pipe forms a swirling mist around the The axial co-flow air that advances spirally in the nebulizer, the air that flows into the axial air flow mixing chamber through the axial counter-flow inlet pipe forms the axial counter-flow air that advances helically around the swirl atomizer, and the axial co-flow air The direction of rotation of the flow air is opposite to that of the axial counterflow air, and the flow ratio of the air flow in the axial forward flow intake pipe to the air flow in the axial counterflow intake pipe is 100%: 0% to 0%: Varies between 100%.

In one of the embodiments, it further includes a tangential airflow mixing section, the tangential airflow mixing section is sleeved outside the opening end of the axial airflow mixing section, and the tangential airflow mixing section includes an annular cut To the airflow mixing chamber, the tangential airflow mixing section is equipped with a tangential forward flow inlet pipe and a tangential counterflow air inlet pipe communicating with the tangential airflow mixing chamber, the axial direction of the tangential forward flow inlet pipe, The axial direction of the tangential counterflow inlet pipe is tangent to the outer peripheral surface of the tangential airflow mixing section, and the communication position between the tangential forward flow inlet pipe and the tangential airflow mixing chamber, the tangential counterflow The communication position between the air intake pipe and the tangential air flow mixing chamber is staggered along the axial direction of the tangential air flow mixing section, and the air flowing into the tangential air flow mixing chamber through the tangential downstream air inlet pipe spirals forward to form a circle around the The tangential co-flow air at the opening end, the air flowing into the tangential air flow mixing chamber through the tangential counter-flow air inlet pipe spirals forward to form the tangential counter-flow air surrounding the opening end, the tangential co-flow air and the tangential air flow The counter-flow air has the opposite rotation direction, and along the radial direction of the axial air-flow mixing section, the tangential co-flow air and the tangential counter-flow air are located outside the axial co-flow air and the axial counter-flow air, The flow ratio of the air flow in the tangential forward flow intake pipe to the air flow in the tangential reverse flow intake pipe varies between 100%:0% and 0%:100%.

In one of the embodiments, the tangential airflow mixing section includes an annular side plate and an end plate connected to the end of the side plate, and the inside of the side plate is hollow to form the tangential airflow mixing chamber , the inside of the end plate is hollow to form a tangential air flow outlet ring communicating with the tangential air flow mixing chamber, the end plate is provided with a gap communicating with the tangential air flow outlet ring, the tangential co-flow air The tangential counterflow gas flows along the circumference of the tangential gas flow outlet ring and flows out of the flame synthesis burner that can realize flexible adjustment of axial and tangential combined swirl through the gap.

In one of the embodiments, it further includes a ring-shaped air flow separation section with two ends open, the side plate and the end plate define a first installation cavity, and the air flow separation section is installed in the first installation cavity The wall of the chamber, the air flow partition section includes a second installation chamber, the opening end extends into the second installation chamber, and the air flow and fuel ejected through the opening end are ejected outward through the gap.

In one embodiment, along the axial direction of the axial airflow mixing section, there is a height difference between the outer end of the airflow dividing section and the outer end of the axial airflow mixing section.

In one of the embodiments, along the radial direction of the axial airflow mixing section, the communication position between the axial forward flow inlet pipe and the axial airflow mixing chamber, the axial reverse flow inlet pipe and the shaft The communication positions to the airflow mixing chamber are respectively located at both ends of the axial airflow mixing section; and/or,

Along the radial direction of the tangential airflow mixing section, the communication position between the tangential forward flow inlet pipe and the tangential airflow mixing chamber, and the communication position between the tangential counterflow air inlet pipe and the tangential airflow mixing chamber They are respectively located at both ends of the tangential airflow mixing section.

In one of the embodiments, it further includes a hollow swirl disk, the hollow swirl disk is installed on the opening end, and the swirl atomizer protrudes outward through the central hole of the hollow swirl disk, The swirl atomizer is provided with a plurality of through holes arranged at intervals along its circumferential direction. Along the radial direction of the hollow swirl disc, the through holes are located outside the central hole, and the axial The co-current air and the axially counter-current air are ejected through the through holes.

In one of the embodiments, the swirl atomizer includes an atomizing nozzle and a main body, the axial air flow mixing section includes a closed end opposite to the open end, and the main body passes through the closed end. The end extends into the axial air flow mixing chamber and is inserted into the central hole, and the main body part is fixedly connected to the closed end, and the atomizing nozzle is supported on the hollow swirl disc away from the axial direction. On one side of the airflow mixing chamber, the atomizing nozzle is fixedly connected with the main body, fuel can flow in through the main body, and be sprayed out through the atomizing nozzle.

In one of the embodiments, the axial direction of the axial forward flow inlet pipe and the axial direction of the axial reverse flow inlet pipe are both inclined relative to the end face of the axial air flow mixing section, and the axial direction along the axial direction The air flow direction in the air intake pipe, the distance between the axial flow air intake pipe and the air flow outlet of the axial air flow mixing section gradually decreases, and the air flow direction in the axial counterflow air intake pipe, the axial direction The distance between the reverse flow inlet pipe and the airflow outlet gradually decreases.

In one of the embodiments, the interior of the swirl atomizer is provided with a precursor central tube and an outer layer shear gas tube extending axially along the axial flow mixing section, and the outlet of the precursor central tube The outlet of the outer layer shearing air pipe is connected with the atomizing nozzle, the outer layer shearing air pipe is sleeved outside the central tube of the precursor, and the air ejected through the atomizing nozzle is wrapped in the Fuel outside.

The above-mentioned flame synthesis burner that can realize the flexible adjustment of axial and tangential combined swirl flow, the air flowing into the axial flow mixing chamber through the axial flow inlet pipe forms the axial flow air that spirals around the swirl atomizer, The air flowing into the axial airflow mixing chamber through the axial counterflow air inlet pipe forms the axial counterflow air that spirals around the swirl atomizer. When the flow ratio of the air flow in the air flow and the air flow in the axial counterflow intake pipe changes between 100%:0% and 0%:100%, the ratio of the axial forward flow air and the axial counterflow air in the axial airflow mixing chamber The proportion of traffic changes accordingly. When the flow rate of axially downstream air is large and dominant, the airflow in the axial airflow mixing chamber advances in a clockwise spiral, and the greater the flow rate of axially downstream air, the greater the flow rate of the clockwise airflow in the axial airflow mixing chamber. The greater the flow intensity is; when the flow rate of the axial counterflow air is large and dominant, the airflow in the axial airflow mixing chamber advances in a counterclockwise spiral, and the greater the flow rate of the axial counterflow air, the greater the flow rate in the axial airflow mixing chamber. The swirl strength of the counterclockwise airflow is greater. When the flow ratio between the axial counter-flow air flow and the axial co-flow air flow gradually increases from 100%:0% to 0%:100%, the counterclockwise rotating air flow inside the axial air flow mixing section 100 will be swirled. The flow intensity gradually decreases, and gradually transforms into a direct flow along the axial direction, and then generates a clockwise swirling airflow, and its swirl intensity gradually increases. By adjusting the flow ratio of the two streams of forward flow air and counterflow air, the swirl direction and swirl intensity of the airflow in the axial flow mixing chamber and tangential flow mixing chamber can be continuously and flexibly adjusted, so that the nano powder can be adjusted more flexibly Body particle synthesis process. In addition, the flame synthesizing burner, which can realize the flexible adjustment of axial and tangential combined swirl flow, does not need to set more complicated structures such as swirl blades and external actuators when adjusting, the overall structure is simpler, and the manufacturing cost and difficulty are lower.

(1) Compared with the conventional technical scheme of arranging duty flames around the atomized precursor (usually using _CH4 or natural gas combustion to build duty flames), the present invention can completely rely on atomized liquid fuels through structure and air distribution design. The self-sustaining combustion of the swirling flame synthesis burner is realized under the self-combustion heat release and the reasonable coupling of the surrounding annular swirl wind combustion organization;

(2) In the circumferential direction of the central atomized precursor, from the inside to the outside, the axial swirl wind and the tangential swirl wind are arranged in sequence, and there is an air separation section between the axial swirl wind and the tangential swirl wind to ensure the The flexible adjustment of the axial distribution and radial distribution size and position of the high-temperature flame field can achieve rapid and effective adjustment of the nucleation, coalescence and sintering process of nano-powder particles, and realize effective control of the particle size, shape and crystallinity of the synthesized nanoparticles. Mutually;

(3) The axial swirl wind and the tangential swirl wind constructed in the present invention can continuously carry out on-line swirl direction and swirl intensity of the airflow by adjusting the air volume ratio between the two streams of downstream air and countercurrent air. Flexible adjustment, adding flexible adjustment measures to the synthesis process of nano-powder particles;

(4) The atomized flame synthesis burner of the present invention has a simple structure, is convenient for design and processing, and has low manufacturing cost, which is conducive to improving the powder material synthesis output of a single atomization flame synthesis burner and promoting atomization swirl flame synthesis Large-scale promotion and application of technology.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a flame-combining burner capable of flexibly adjusting axial and tangential combined swirls in an embodiment of the present invention;

Figure 2 is a top view of the flame synthesis burner that can realize the flexible adjustment of axial and tangential combined swirl in Figure 1;

Fig. 3 is the sectional view of B-B place among Fig. 2;

Fig. 4 is the sectional view of A-A place among Fig. 1;

Fig. 5 is a structural schematic diagram of the hollow swirl disc of the flame synthesis burner that can realize the flexible adjustment of axial and tangential combined swirl in Fig. 1;

Fig. 6 is the airflow flow schematic diagram when constructing counterclockwise swirl airflow;

Fig. 7 is the airflow flow schematic diagram when constructing the clockwise swirling airflow;

Fig. 8 is a schematic diagram of the airflow direction and flame distribution of the flame synthesis burner that can realize the flexible adjustment of axial and tangential combined swirl in Fig. 1;

Fig. 9 is a schematic diagram of the size of the flame synthesis burner in Fig. 1 that can realize the flexible adjustment of axial and tangential combined swirl.

Reference signs:

Axial airflow mixing section 100, axial airflow mixing chamber 110;

Tangential airflow mixing section 200, tangential airflow mixing chamber 210, tangential airflow outlet ring 220, side plate 230, end plate 240, gap 241;

Axial forward flow air intake pipe 310, axial reverse flow air intake pipe 320, tangential forward flow air intake pipe 330, tangential reverse flow air intake pipe 340;

Swirl atomizer 400, atomizing nozzle 410, main body 420, precursor central tube 421, outer shear gas tube 422;

The airflow separation section 500, the second installation chamber 510;

Hollow swirl disc 600, through hole 610, center hole 620;

Precursor inlet pipe 710, shear gas inlet pipe 720.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and therefore should not be construed as limitations on the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiments.

Referring to Fig. 1 to Fig. 3, and Fig. 8, the flame synthesis burner that can realize the flexible adjustment of axial and tangential combined swirl provided by an embodiment of the present invention includes an axial airflow mixing section 100, and an axial airflow mixing section 100 Axial airflow mixing chamber 110 is arranged inside the axial airflow mixing chamber 110. A swirl atomizer 400 is installed in the axial airflow mixing chamber 110. The fuel can be atomized by the swirl atomizer 400 and sprayed out. There is an axial forward flow inlet pipe 310 and an axial counterflow inlet pipe 320 communicating with the axial airflow mixing chamber 110. The outer peripheral surface of the mixing section 100 is tangent, and the communication position between the axial forward flow inlet pipe 310 and the axial airflow mixing chamber 110 and the communication position between the axial counterflow inlet pipe 320 and the axial airflow mixing chamber 110 are along the direction of the axial airflow mixing section 100 Axially staggered, the air flowing into the axial airflow mixing chamber 110 through the axial forward flow inlet pipe 310 forms axially forward flow air spirally advancing around the swirl atomizer 400, and flows into the axial airflow mixing chamber through the axial counterflow inlet pipe 320 The air in the chamber 110 forms an axially countercurrent air that spirals forward around the swirl atomizer 400. The direction of the axially forward air is opposite to that of the axially counterflow air. The flow ratio of the air flow in the air duct 320 varies from 100%:0% to 0%:100%.

Specifically, the shape of the axial air mixing section 100 is cylindrical, and the inside of the axial air mixing section 100 is hollow to form an axial air mixing chamber 110. One end of the axial air mixing section 100 is a closed end, and the other end is an open end. . From the perspective shown in the drawings, the up and down direction is the axial direction of the axial air mixing section 100 , the bottom end of the axial air mixing section 100 is a closed end, and the top end is an open end. The swirl atomizer 400 is coaxially installed at the center of the axial airflow mixing chamber 110 . The liquid fuel (such as alcohol-based liquid fuel) is atomized by the swirl atomizer 400 to form small droplets and sprayed upward. The axial forward flow inlet pipe 310 and the axial counterflow inlet pipe 320 are installed on the axial airflow mixing section 100 near the closed end. The axial forward-flow intake pipe 310 and the axial counter-flow intake pipe 320 may be in the shape of a hollow cylinder, or may be in the shape of a hollow cuboid or the like. When it is a hollow cuboid, its axial direction is the length direction of the cuboid. The communication position of the axial forward flow inlet pipe 310 and the axial air flow mixing chamber 110, and the communication position of the axial counterflow inlet pipe 320 and the axial air flow mixing chamber 110 are staggered along the axial direction of the axial air flow mixing section 100 to prevent the axial The co-flow air collides with the axial counter-flow air and cannot flow in the expected direction and speed. In the embodiment shown in the drawings, the axial forward flow intake pipe 310 is located above the axial reverse flow intake pipe 320 , in other embodiments, the axial reverse flow intake pipe 320 can also be arranged on the axial forward flow intake pipe 310 above. After the air flows into the axial airflow mixing chamber 110 through the axial forward flow air inlet pipe 310 and the axial counterflow air inlet pipe 320, two swirl winds will be formed which surround the swirl atomizer 400 and advance spirally upwards, one of which is Axial flow air that advances in a clockwise spiral, and another axial counterflow air that advances in a counterclockwise spiral.

When the flow ratio of the air flow in the axial forward flow intake pipe 310 to the air flow in the axial counterflow intake pipe 320 changes between 100%:0% and 0%:100%, the axial airflow mixing chamber 110 The flow ratio of axial co-flow air and axial counter-flow air changes accordingly. When the flow rate of the axially downstream air is large and dominant, the airflow in the axial airflow mixing chamber 110 advances in a clockwise spiral, and the greater the flow rate of the axially downstream air, the more clockwise airflow in the axial airflow mixing chamber 110 The greater the swirl intensity; when the flow rate of the axial counterflow air is large and dominant, the airflow in the axial airflow mixing chamber 110 advances in a counterclockwise spiral, and the greater the flow rate of the axial counterflow air, the axial airflow mixing The swirl strength of the counterclockwise airflow in the chamber 110 is greater. When the flow ratio of the axial counter-flow air flow to the axial co-flow air flow gradually increases from 100%:0% to 0%:100%, the swirl intensity of the counterclockwise airflow inside the axial airflow mixing section 100 will be increased. Gradually decreases, and gradually transforms into a direct flow along the axial direction, and then generates a clockwise swirling airflow, and its swirl intensity gradually increases. By adjusting the flow ratio of the forward flow air and the counterflow air flow, the swirl direction and swirl intensity of the air flow in the axial flow mixing chamber 110 can be continuously and flexibly adjusted, thereby more flexibly adjusting the synthesis process of nanopowder particles. In addition, the flame synthesizing burner, which can realize the flexible adjustment of axial and tangential combined swirl flow, does not need to set more complicated structures such as swirl blades and external actuators when adjusting, the overall structure is simpler, and the manufacturing cost and difficulty are lower.

The swirling wind spirally advances to the top of the axial airflow mixing section 100, and is ejected outward. The swirl wind surrounds the outer ring of the swirl atomizer 400, and the fuel sprayed by the swirl atomizer 400 will be located inside the swirl wind. Under the action of a high-temperature ignition heat source, the fuel (such as alcohol-based liquid fuel) will burn and release heat, which will cause the precursor salt (nitrate or acetate and other salts) dissolved in the fuel to undergo pyrolysis, thereby forming oxide nanoparticles. On the one hand, the swirling wind formed around the atomized precursor can supplement the oxygen for the continuous combustion of the fuel; The inner ring of the swirling wind, that is, the fuel combustion area, forms a high-temperature recirculation area, which helps to maintain the high-temperature state of the fuel combustion area, increase the flame temperature, stabilize the distribution of the combustion flame and the high-temperature area, and promote the formation of nano-oxides during the combustion process. The process of particle nucleation, coalescence and sintering growth improves the synthesis yield and quality of nano powder particles.

Referring to Figures 1 to 3, and Figure 8, in some embodiments, a tangential airflow mixing section 200 is also included, and the tangential airflow mixing section 200 is sleeved outside the opening end of the axial airflow mixing section 100, and the tangential airflow mixing section The section 200 includes a ring-shaped tangential airflow mixing chamber 210. A tangential forward flow air inlet pipe 330 and a tangential counterflow air inlet pipe 340 communicating with the tangential airflow mixing chamber 210 are installed on the tangential airflow mixing chamber 200. The axial direction of the airflow inlet pipe 330 and the axial direction of the tangential counterflow air inlet pipe 340 are all tangent to the outer peripheral surface of the tangential airflow mixing section 200, and the communication position, tangential The communication position between the counterflow air inlet pipe 340 and the tangential airflow mixing chamber 210 is staggered along the axial direction of the tangential airflow mixing section 200, and the air flowing into the tangential airflow mixing chamber 210 through the tangential forward flow air inlet pipe 330 spirals forward to form a circle around the opening end. Tangential downstream air, the air flowing into the tangential airflow mixing chamber 210 through the tangential reverse flow inlet pipe 340 spirals forward to form tangential countercurrent air around the opening end, the tangential downstream air and the tangential countercurrent air have the opposite rotation direction, and along the axial direction The radial direction of the airflow mixing section 100, the tangential forward flow air and the tangential reverse flow air are located outside the axial forward flow air and the axial reverse flow air, and the air flow rate in the tangential forward flow inlet pipe 330 is the same as that in the tangential reverse flow inlet pipe 340. The flow ratio of the air flow varies from 100%:0% to 0%:100%.

Specifically, the tangential airflow mixing section 200 is in the shape of a hollow cylinder with one end open and the other end closed, and the inside of the tangential airflow mixing section 200 is hollow. The tangential forward flow inlet pipe 330 and the tangential reverse flow inlet pipe 340 are installed on the tangential airflow mixing section 200 near the bottom. The tangential forward flow inlet pipe 330 and the tangential counterflow inlet pipe 340 may be in the shape of a hollow cylinder, or may be in the shape of a hollow cuboid or the like. When it is a hollow cuboid, its tangential direction is the length direction of the cuboid. The communication position of the tangential forward flow inlet pipe 330 and the tangential airflow mixing chamber 210, and the communication position of the tangential counterflow inlet pipe 340 and the tangential airflow mixing chamber 210 are staggered along the axial direction of the tangential airflow mixing section 200 to prevent tangential The co-current gas collides with the tangential counter-current gas and cannot flow in the expected direction and speed. In the embodiment shown in the drawings, the tangential forward flow inlet pipe 330 is located above the tangential reverse flow inlet pipe 340 , in other embodiments, the tangential reverse flow inlet pipe 340 can also be arranged on the tangential forward flow inlet pipe 330 above. After the air flows into the tangential airflow mixing chamber 210 through the tangential forward flow air inlet pipe 330 and the tangential counterflow air inlet pipe 340, two swirling air flows spirally upward, one of which is a tangential forward airflow spirally advancing clockwise. The other is a tangential countercurrent air that spirals forward in a counterclockwise direction.

When the flow ratio of the air flow in the tangential forward flow inlet pipe 330 to the air flow in the tangential counterflow air inlet pipe 340 changes between 100%:0% to 0%:100%, the tangential airflow mixing chamber 210 The flow ratio of tangential co-flow gas and tangential counter-flow gas changes accordingly. When the flow rate of tangential downstream air is large and dominant, the airflow in the tangential airflow mixing chamber 210 advances in a clockwise spiral, and the larger the flow rate of tangential downstream air is, the clockwise airflow in the tangential airflow mixing chamber 210 The greater the swirl intensity; when the flow rate of the tangential counterflow air is larger and dominant, the airflow in the tangential airflow mixing chamber 210 advances in a counterclockwise spiral, and the greater the flow rate of the tangential counterflow air, the tangential airflow mixing The swirl strength of the counterclockwise airflow in the chamber 210 is greater. When the flow ratio of the tangential counter-flow air flow to the tangential co-flow air flow gradually increases between 100%:0% and 0%:100%, the swirl intensity of the counterclockwise airflow inside the tangential airflow mixing section 200 will be increased. Gradually decreases, and gradually transforms into a direct flow along the axial direction, and then generates a clockwise swirling airflow, and its swirl intensity gradually increases. By adjusting the flow ratio of the forward flow gas and the counterflow gas flow, the swirl direction and swirl intensity of the gas flow in the tangential flow mixing chamber 210 can be continuously and flexibly adjusted, thereby more flexibly adjusting the synthesis process of nanopowder particles. The tangential swirling wind surrounds the outer side of the axial swirling wind ejected from the top of the axial airflow mixing chamber 110, thereby forming a double-layer swirling wind, which supplements the oxygen in the combustion zone in stages, and is more likely to form a central low-pressure zone. Therefore, it is beneficial to improve the ability of the overall circumferential swirling air to build a high-temperature recirculation zone, improve the self-sustaining combustion ability of the atomized synthesis flame, and improve the stability of the flame.

3 and 8, in some embodiments, the tangential airflow mixing section 200 includes an annular side plate 230 and an end plate 240 connected to the end of the side plate 230, the side plate 230 is hollow inside to form a tangential The airflow mixing chamber 210, the end plate 240 is hollow inside to form a tangential airflow outlet ring 220 communicating with the tangential airflow mixing chamber 210, the end plate 240 is provided with a gap 241 communicating with the tangential airflow outlet ring 220, and the tangential airflow The tangential counterflow gas flows along the circumferential direction of the tangential gas flow outlet ring 220 and flows out through the gap 241, which can realize the flexible adjustment of axial and tangential combined swirl flow. Specifically, both the tangential forward flow air intake pipe 330 and the tangential reverse flow air intake pipe 340 are installed on the outer peripheral surface of the side plate 230 . The end plate 240 is connected to the top of the side plate 230 , and the center of the end plate 240 is provided with a notch 241 axially penetrating through itself, so that the inner cavity of the end plate 240 is annular to form a tangential airflow outlet ring 220 . After the tangential forward flow air flowing into the tangential air flow mixing chamber 210 is mixed with the tangential counter flow air, a tangential swirling air flow dominated by the air flow with a higher flow rate will be formed. The tangential swirling air flows into the tangential airflow outlet ring 220 from the tangential airflow mixing chamber 210 , and is sprayed out from the gap 241 at the inner circle of the tangential airflow outlet ring 220 . When the tangential swirling air flows in the tangential airflow outlet ring 220 , it will surround the outside of the axial swirling air ejected from the top of the axial airflow mixing section 100 , thereby forming a double-layer swirling air.

Referring to FIG. 3 and FIG. 8 , in some embodiments, it also includes an annular airflow partition section 500 with openings at both ends, the side plate 230 and the end plate 240 define a first installation cavity, and the airflow partition section 500 is installed in the first The cavity wall of the installation cavity, the air flow partition section 500 includes a second installation cavity 510 , the opening end extends into the second installation cavity 510 , and the air flow and fuel ejected through the opening end are ejected outward through the gap 241 . Specifically, the side plate 230 and the inner side of the end plate 240 form a columnar first installation cavity, the outer wall of the air flow partition section 500 is attached to the inner wall of the side plate 230, and the end wall of the air flow partition section 500 is attached to the end plate 240 the inner wall. Both the top end and the bottom end of the air separation section 500 are open, and the inside is hollow to form a second installation cavity 510 . The top end of the axial airflow mixing section 100 protrudes into the second installation cavity 510 from bottom to top, and the outer sidewall of the axial airflow mixing section 100 is attached to the inner sidewall of the airflow partition section 500 . The airflow separation section 500 can be fixed between the axial airflow mixing section 100 and the tangential airflow mixing section 200 by clamping, threaded fastener connection and the like. By being arranged between the axial airflow mixing section 100 and the tangential airflow mixing section 200, the airflow separation section 500 can increase the radial distance between the inner and outer two-layer swirl wind, and separate the inner and outer two-layer swirl wind as far as possible, so that the two layers The swirling winds are not easy to mix together and interfere with each other.

Referring to FIG. 3 , FIG. 8 and FIG. 9 , in some embodiments, along the axial direction of the axial airflow mixing section 100 , there is a height difference between the outer end of the airflow dividing section 500 and the outer end of the axial airflow mixing section 100 . Specifically, there is a height difference H ₁ between the top end of the airflow separation section 500 and the top end of the axial airflow mixing section 100 . After the fuel is sprayed upward from the top of the swirl atomizer 400, it is ignited to form a flame. Within the height difference range, the axial swirl air sprayed upward from the top of the axial air flow mixing section 100 can stably surround the When the flame outer circle reaches the gap 241, the tangential swirl wind is added to form two layers of swirl wind, so as to prevent the two layers of swirl wind from interfering with each other and unable to flow according to the expected speed and flow direction. Preferably, in some embodiments, 0.2H≤H ₁ ≤0.6H, where H is the axial length of the tangential airflow mixing section 200, and when this value range is met, the device can be guaranteed to have a smaller axial dimension, At the same time, the axial swirling air jetted upward from the top of the axial air flow mixing section 100 can stably surround the outer circle of the flame.

Referring to FIG. 2 and FIG. 4 , FIG. 6 and FIG. 7 , in some embodiments, along the radial direction of the axial airflow mixing section 100 , the communication position of the axial downstream air intake pipe 310 and the axial airflow mixing chamber 110 The communication positions between the reverse flow inlet pipe 320 and the axial airflow mixing chamber 110 are respectively located at both ends of the axial airflow mixing section 100; and/or,

Along the radial direction of the tangential airflow mixing section 200, the communication position between the tangential forward flow inlet pipe 330 and the tangential airflow mixing chamber 210, and the communication position between the tangential counterflow air inlet pipe 340 and the tangential airflow mixing chamber 210 are respectively located in the tangential airflow mixing chamber 210. both ends of the mixing section 200.

Specifically, the axial forward flow intake pipe 310 is located on the side opposite to the axial reverse flow intake pipe 320 . The communication position between the axial forward flow inlet pipe 310 and the axial airflow mixing chamber 110 is located at the lower end from the perspective of FIG. When the two communication positions are respectively arranged at two ends along the radial direction, the distance between the two communication positions is the largest, and the respective inflowing airflows are less likely to interfere with each other. Similarly, from the perspective of FIG. 2 , the tangential forward flow intake pipe 330 is located on the opposite side of the tangential reverse flow intake pipe 340 . The communication position between the tangential forward flow inlet pipe 330 and the tangential airflow mixing chamber 210 is located at the lower end, and the communication position between the tangential counterflow air inlet pipe 340 and the tangential airflow mixing chamber 210 is located at the upper end. Of course, in addition to the illustrated positions, other positions are also possible, for example, respectively located at the left end and the right end.

Referring to Fig. 2, Fig. 3, Fig. 5 and Fig. 8, in some embodiments, a hollow swirl disk 600 is also included, the hollow swirl disk 600 is installed at the open end, and the swirl atomizer 400 passes through the hollow swirl disk 600 The central hole 620 protrudes outward, and the swirl atomizer 400 is provided with a plurality of through holes 610 arranged at intervals along its circumferential direction. Along the radial direction of the hollow swirl disk 600, the through holes 610 are located On the outside, the axial co-current air and the axial counter-current air are ejected through the through hole 610 . Specifically, the hollow swirl disk 600 is installed at the top opening of the axial airflow mixing section 100, and its outer diameter is equal to the inner diameter of the axial airflow mixing section 100. The opening is blocked, and the outer wall of the hollowed out swirl disk 600 bears against the sidewall of the axial airflow mixing chamber 110 to realize the radial limit of the hollowed out swirl disk 600 . A center hole 620 is provided at the center of the hollow swirl disk 600 along its axial direction, and the swirl atomizer 400 protrudes outward through the center hole 620 from bottom to top. A plurality of through holes 610 are disposed around the central hole 620 , and the plurality of through holes are evenly spaced. The axial swirling air reaching the top of the axial air mixing section 100 can be ejected upward through each through hole 610 . In the embodiment shown in the drawings, the through hole 610 is fan-shaped, and the circumferential dimension of the through hole 610 gradually increases along the radial and outward direction of the swirl atomizer 400 . Certainly, in some other embodiments, the through hole 610 may also be set in other shapes, such as circular, elliptical, rectangular and so on. Since there is no shielding part at the through hole 610, the axial swirling air can be smoothly circulated and the obstruction to the swirling air flow can be reduced.

3 and 8, in some embodiments, the swirl atomizer 400 includes an atomizing nozzle 410 and a main body 420, the axial flow mixing section 100 includes a closed end opposite to the open end, and the main body 420 passes through The closed end extends into the axial air mixing chamber 110 and is inserted into the central hole 620, and the main body 420 is fixedly connected to the closed end, and the atomizing nozzle 410 is held against the side of the hollow swirl disk 600 facing away from the axial air mixing chamber 110, The atomizing nozzle 410 is fixedly connected with the main body 420 , fuel can flow in through the main body 420 and be sprayed out through the atomizing nozzle 410 . Specifically, an installation hole is provided at the center of the closed end of the axial airflow mixing section 100 , and the main body 420 is rod-shaped, passes through the installation hole from bottom to top, and is fixed on the closed end. Specifically, an external thread can be provided on the outer peripheral surface of the part of the main body 420 exposed outside the axial air flow mixing section 100, and the nut is screwed on the external thread until the nut is against the outer end surface of the closed end of the axial air flow mixing section 100, thereby The main body part 420 is fixedly mounted on the closed end of the axial flow mixing section 100 . Certainly, in other embodiments, the fixed installation may also be implemented by clamping or the like. The top end of the main body part 420 passes through the central hole 620 and is fixedly connected with the atomizing nozzle 410 located above the hollow swirl disk 600 , for example, can be fixed by screws, or can also be fixed by clamping. The fuel flows through the inside of the main body part 420 , flows upward, flows into the atomizing nozzle 410 , and is sprayed upward through the atomizing nozzle 410 .

Referring to FIG. 1 and FIG. 3 , in some embodiments, the axial direction of the axial forward flow inlet pipe 310 and the axial direction of the axial counterflow inlet pipe 320 are both inclined relative to the end surface of the axial airflow mixing section 100 , The air flow direction in the air inlet pipe 310 is axially forward, and the distance between the air flow outlet of the air inlet pipe 310 and the axial air flow mixing section 100 is gradually reduced, and the air flow direction in the air inlet pipe 320 is axially reversed, and the axial direction of the air flow in the air inlet pipe is reversed. The distance between 320 and the airflow outlet gradually decreases. Specifically, along the flow direction of the airflow in the axial downstream intake pipe 310 , the axial downstream intake pipe 310 is inclined upward. Along the flow direction of the airflow in the axial reverse flow intake pipe 320 , the axial reverse flow intake pipe 320 is inclined upward. Such setting can make the axial co-current air and the axial counter-current air have an upward flow velocity at the initial stage, so that it is easier to flow upward. Preferably, in some embodiments, 5°≤α≤20°, where α is the angle between the axial direction and the end surface (that is, the horizontal direction) of the axial flow mixing section 100 of the axial co-flow inlet pipe 310, and is also The included angle between the axial direction of the axial reverse flow inlet pipe 320 and the end surface (ie, the horizontal direction) of the axial airflow mixing section 100 . Similarly, along the flow direction of the airflow in the tangential co-flow intake duct 330 , the tangential co-flow intake duct 330 is inclined upward. Along the flow direction of the airflow in the tangential counterflow intake duct 340 , the tangential counterflow intake duct 340 is inclined upward. Of course, in some embodiments, the axial forward flow inlet pipe 310 , the axial reverse flow inlet pipe 320 , the tangential forward flow inlet pipe 330 , and the tangential reverse flow inlet pipe 340 can all be set horizontally.

Referring to the figure, in some embodiments, the interior of the swirl atomizer 400 is provided with a precursor central tube 421 extending axially along the axial flow mixing section 100 and an outer layer shear gas tube 422. The precursor central tube 421 Both the outlet and the outlet of the outer layer shearing air pipe 422 are in communication with the atomizing nozzle 410, the outer layer shearing air pipe 422 is sleeved outside the precursor central pipe 421, and the air ejected from the atomizing nozzle 410 is wrapped around the outside of the fuel. Specifically, the outer shear gas pipe 422 communicates with the shear gas inlet pipe 720 , and the precursor central pipe 421 communicates with the precursor inlet pipe 710 . Both the precursor inlet pipe 710 and the shear gas inlet pipe 720 extend into the axial flow mixing chamber 110 through the sidewall of the axial flow mixing section 100 , and are respectively connected to corresponding positions on the main body 420 . The air flows into the outer shear gas pipe 422 through the shear gas inlet pipe 720 , and then flows into the atomizing nozzle 410 . The precursor flows into the precursor central pipe 421 through the precursor inlet pipe 710 , and flows into the atomizing nozzle 410 . In the atomizing nozzle 410, the precursor is surrounded by air and ejected at high speed. During the ejection process, the air will shear and break the precursor to atomize the precursor, and the liquid precursor is broken into smaller droplets, which are easier to burn fully. Preferably, the atomizing nozzle 410 is in the shape of a hollow cone, and the radial dimension of the inner cavity gradually decreases from bottom to top. The fuel flows into the conical inner cavity of the atomizing nozzle 410 through the precursor central tube 421, and the air also passes through the outer layer The shear air tube 422 flows into the conical inner cavity of the atomizing nozzle 410 . By limiting the inner cavity of the atomizing nozzle 410 to be conical, the angle of air spraying can be directed toward the fuel at the center as much as possible, thereby intensifying the shearing and breaking of the liquid fuel and making the atomization effect better.

Referring to FIG. 3 , FIG. 8 and FIG. 9 , in some embodiments, 5°≤α≤20°; 1.5d≤h≤3d; 1.1d≤D ₂ ≤1.5d; 1.1D ₂ ≤D ₁ ≤1.2D ₂ ; 0.5D ₂ ≤ H ≤ 0.9D ₂ ; 0.2H ≤ H ₁ ≤ 0.6H. Wherein, α is the angle between the axial direction of the axial forward flow inlet pipe 310 and the end surface of the axial airflow mixing section 100 , and is also the angle between the axial direction and the end surface of the axial airflow mixing section 100 of the axial counterflow inlet pipe 320 . H ₁ is the height difference between the end plate 240 and the top end of the axial airflow mixing section 100 , and H is the axial length of the tangential airflow mixing section 200 . d is the inner diameter of the axial air flow mixing section 100 , and h is the axial length of the axial air flow mixing chamber 110 in the axial air flow mixing section 100 . D ₁ is the inner diameter of the tangential airflow mixing section 200 , and _D2 is the outer diameter of the airflow separation section 500 . When the above numerical range is satisfied, the burner can achieve a better synthesis effect, which is beneficial to the nucleation, coalescence and sintering growth process of nano-oxide particles.

Referring to Fig. 3 and Fig. 8, the liquid fuel self-sustaining combustion flame synthesis burner of the present invention mainly has 4 streams of air flow and liquid flow to participate in the process of flame synthesis of nano-powder particles in the combustion process, specifically including: axial swirling wind, cutting Swirl wind, precursor, shear gas. Among them, the axial swirl wind is composed of two airflow couplings of axial counterflow air and axial downflow air, and the tangential swirl wind is composed of two airflow couplings of tangential counterflow air and tangential downflow air at the same time, specifically:

Axial swirling air, including axial counterflow air, is injected through the axial counterflow inlet pipe 320, while axial downflow air is injected through the axial downflow inlet pipe 310, and then the two airflows jointly travel along different heights and positions at high speeds. It is sprayed into the axial airflow mixing section 100. Since the direction of the rotating airflow generated between the two is different, when the incident momentum of the axially forward flow air is greater than that of the axially counterflow air, the axially forward flow air will The clockwise rotation of the mixing section 100 will play a dominant role, and generate a clockwise swirling airflow at the upper end of the axial airflow mixing section 100, and when the incident momentum of the axially forward flow air is smaller than the incident momentum of the axially counterflow air, this , the counterclockwise rotation of the axial counterflow air in the axial airflow mixing section 100 will play a dominant role, and a counterclockwise swirling airflow will be generated at the upper end of the axial airflow mixing section 100 . In this process, when the flow ratio of the axial counter-flow air flow and the axial co-flow air flow gradually increases from 100%:0% to 0%:100%, the counterclockwise flow inside the axial air flow mixing section 100 will be made The swirl intensity of the swirling airflow decreases gradually, and gradually transforms into a direct flow along the axial direction, and then generates a clockwise swirling airflow, and its swirl intensity gradually increases. Then the airflow with a certain swirl intensity is ejected from the upper through hole 610 .

The tangential swirling wind, including the tangential counter-flow air, is injected through the tangential counter-flow air intake pipe 340, while the tangential downstream air is injected through the tangential downstream air intake pipe 330. It is sprayed into the inside of the tangential airflow mixing section 200. Since the direction of the swirling airflow generated between the two is different, when the incident momentum of the tangential forward flow air is greater than that of the tangential counterflow air, the tangential forward flow air will The clockwise rotation inside the mixing section 200 will play a dominant role, and generate a clockwise swirling airflow flow at the upper end of the tangential airflow mixing section 200, and when the incident momentum of the tangential forward flow air is smaller than the incident momentum of the tangential counterflow air, At this time, the counterclockwise rotation of the tangential counterflow gas inside the tangential airflow mixing section 200 will play a dominant role, and a counterclockwise swirling airflow will be generated at the upper end of the tangential airflow mixing section 200 . In this process, when the flow ratio of the tangential counter-flow air flow to the tangential co-flow air flow gradually increases from 100%:0% to 0%:100%, the counterclockwise movement inside the tangential air flow mixing section 200 will be made The swirl intensity of the swirling airflow decreases gradually, and gradually transforms into a direct flow along the axial direction, and then generates a clockwise swirling airflow, and its swirl intensity gradually increases. Then the tangential airflow with a certain swirl intensity is ejected at high speed from the inner outlet of the tangential airflow outlet ring 220 .

The precursor is mainly a mixture of liquid fuel (such as alcohol-based liquid fuel) and precursor salt (salts such as nitrate or acetate), and enters the precursor through the precursor inlet pipe 710 under the action of an external booster pump. The center tube 421 of the object is sprayed out by the atomizing nozzle 410.

The shearing gas, mainly air flow, enters the outer layer shearing air pipe 422 through the shearing gas inlet pipe 720 under the action of an external booster fan, and is ejected from the atomizing nozzle 410 at high speed.

First of all, compared with the conventional technical scheme of arranging duty flames around atomized precursors (usually using _CH4 or natural gas to burn to build duty flames), the present invention can be used in the environment completely relying on atomized liquid fuels through structure and air distribution design. The self-sustaining combustion of the swirl flame synthesis burner is realized under the combustion organization mode of self-combustion heat release and reasonable coupling with the surrounding annular swirl wind;

Secondly, in the circumferential direction of the central atomized precursor, from the inside to the outside, the axial swirl wind and the tangential swirl wind are arranged in sequence, and there is an air separation section between the axial swirl wind and the tangential swirl wind to ensure the high temperature The axial distribution of the flame field and the flexible adjustment of the size and position of the radial distribution can achieve rapid and effective adjustment of the nucleation, coalescence and sintering process of nano-powder particles, and realize effective control of the particle size, shape and crystal phase of the synthesized nanoparticles ;

Again, both the axial swirl wind and the tangential swirl wind constructed in the present invention can continuously and flexibly adjust the swirl direction and swirl intensity of the airflow by adjusting the air volume ratio between the forward flow air and the counterflow air flow. Adjustment, adding flexible adjustment measures to the synthesis process of nano-powder particles;

Again, the atomized flame synthesis burner of the present invention has a simple structure, is convenient for design and processing, and has low manufacturing cost, which is conducive to improving the powder material synthesis output of a single atomization flame synthesis burner and promoting the atomization swirl flame synthesis technology. large-scale promotion and application.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. The utility model provides a can realize the nimble flame synthesis combustor who adjusts of axial, tangential combination nature whirl which characterized in that includes:

the axial air flow mixing section is internally provided with an axial air flow mixing cavity, a rotational flow atomizer is arranged in the axial air flow mixing cavity, fuel mixed with precursor salt can be atomized by the rotational flow atomizer and sprayed out, an axial downstream air inlet pipe communicated with the axial air flow mixing cavity and an axial countercurrent air inlet pipe are arranged on the axial air flow mixing section, the axial direction of the axial downstream air inlet pipe and the axial direction of the axial countercurrent air inlet pipe are tangential to the peripheral surface of the axial air flow mixing section, the communication position of the axial downstream air inlet pipe and the axial air flow mixing cavity, the communication position of the axial countercurrent air inlet pipe and the axial air flow mixing cavity are staggered along the axial direction of the axial air flow mixing section, air flowing into the axial air flow mixing cavity through the axial downstream air inlet pipe forms axial downstream air which spirally advances around the rotational flow atomizer, air flowing into the axial air mixing cavity through the axial countercurrent air inlet pipe forms axial countercurrent air which spirally advances around the atomizer, and the air flow of the axial downstream air inlet pipe and the axial countercurrent air inlet pipe is opposite to the rotational flow of the axial air inlet pipe, and the air flow of the axial countercurrent air inlet pipe is in the ratio of 100%:0% to 0%: variation between 100%.

2. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow according to claim 1, further comprising a tangential air flow mixing section, wherein the tangential air flow mixing section is sleeved outside the opening end of the axial air flow mixing section, the tangential air flow mixing section comprises a circular tangential air flow mixing cavity, a tangential forward air inlet pipe and a tangential reverse air inlet pipe which are communicated with the tangential air flow mixing cavity are arranged on the tangential air flow mixing section, the axial direction of the tangential forward air inlet pipe and the axial direction of the tangential reverse air inlet pipe are tangential to the outer circumferential surface of the tangential air flow mixing section, the communication position of the tangential forward air inlet pipe and the tangential air flow mixing cavity and the communication position of the tangential reverse air inlet pipe and the tangential air flow mixing cavity are staggered along the axial direction of the tangential air flow mixing section, the air flowing into the tangential airflow mixing cavity through the tangential downstream air inlet pipe spirally advances to form tangential downstream air surrounding the opening end, the air flowing into the tangential airflow mixing cavity through the tangential upstream air inlet pipe spirally advances to form tangential upstream air surrounding the opening end, the tangential downstream air and the tangential upstream air are opposite in rotation direction, and are positioned on the outer sides of the axial downstream air and the axial upstream air along the radial direction of the axial airflow mixing section, and the flow ratio of the air flow in the tangential downstream air inlet pipe to the air flow in the tangential upstream air inlet pipe is 100%:0% to 0%: variation between 100%.

3. The flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible adjustment according to claim 2, wherein the tangential airflow mixing section comprises a ring-shaped side plate and an end plate connected with the end part of the side plate, the side plate is hollow inside to form the tangential airflow mixing cavity, the end plate is hollow inside to form a tangential airflow outlet ring communicated with the tangential airflow mixing cavity, a notch communicated with the tangential airflow outlet ring is arranged on the end plate, and the tangential forward airflow and the tangential reverse airflow flow along the circumferential direction of the tangential airflow outlet ring and flow out of the flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible adjustment through the notch.

4. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow according to claim 3, further comprising an annular airflow separation section with two open ends, wherein the side plate and the end plate define a first installation cavity, the airflow separation section is installed on the cavity wall of the first installation cavity, the airflow separation section comprises a second installation cavity, the open end extends into the second installation cavity, and the airflow ejected through the open end and the fuel are ejected outwards through the notch.

5. The flame synthesizing burner capable of realizing flexible adjustment of axial and tangential combined swirl according to claim 4, wherein a height difference exists between an outer end of the air flow separation section and an outer end of the axial air flow mixing section along an axial direction of the axial air flow mixing section.

6. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow according to claim 2, wherein the communication position of the axial forward flow air inlet pipe and the axial air flow mixing cavity and the communication position of the axial reverse flow air inlet pipe and the axial air flow mixing cavity are respectively positioned at two ends of the axial air flow mixing section along the radial direction of the axial air flow mixing section; and/or the number of the groups of groups,

along the radial direction of the tangential airflow mixing section, the communication position of the tangential downstream air inlet pipe and the tangential airflow mixing cavity and the communication position of the tangential upstream air inlet pipe and the tangential airflow mixing cavity are respectively positioned at two ends of the tangential airflow mixing section.

7. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined swirling flow according to any one of claims 2 to 6, further comprising a hollow swirling flow disk, wherein the hollow swirling flow disk is mounted at the opening end, the swirling flow atomizer penetrates through a central hole of the hollow swirling flow disk and extends outwards, a plurality of through holes are arranged on the swirling flow atomizer at intervals along the circumferential direction of the swirling flow atomizer, the through holes are positioned at the outer side of the central hole along the radial direction of the hollow swirling flow disk, and the axial concurrent air and the axial countercurrent air are sprayed out through the through holes.

8. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined swirl according to claim 7, wherein the swirl atomizer comprises an atomizing nozzle and a main body part, the axial airflow mixing section comprises a closed end positioned at the opposite side of the open end, the main body part penetrates through the closed end to extend into the axial airflow mixing cavity and is inserted into the central hole, the main body part is fixedly connected with the closed end, the atomizing nozzle is propped against one side of the hollowed swirl disk, which is away from the axial airflow mixing cavity, the atomizing nozzle is fixedly connected with the main body part, and the fuel can flow in through the main body part and is sprayed out through the atomizing nozzle.

9. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow according to claim 1, wherein the axial direction of the axial forward flow air inlet pipe and the axial direction of the axial reverse flow air inlet pipe are inclined with respect to the end face of the axial air flow mixing section, the air flow direction in the axial forward flow air inlet pipe is gradually reduced along the air flow direction in the axial forward flow air inlet pipe, the air flow direction in the axial reverse flow air inlet pipe is gradually reduced along the air flow direction in the axial reverse flow air inlet pipe, and the air flow direction in the axial reverse flow air inlet pipe is gradually reduced along the air flow direction in the axial air flow mixing section.

10. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined swirling flow according to claim 1, wherein a precursor central tube and an outer shearing air tube which extend along the axial direction of the axial air flow mixing section are arranged in the swirling atomizer, an outlet of the precursor central tube and an outlet of the outer shearing air tube are communicated with the atomizing nozzle, the outer shearing air tube is sleeved outside the precursor central tube, and air sprayed out from the atomizing nozzle is wrapped outside the fuel.

Images