CN114459024A - Flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows - Google Patents
Flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows Download PDFInfo
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- CN114459024A CN114459024A CN202210129593.6A CN202210129593A CN114459024A CN 114459024 A CN114459024 A CN 114459024A CN 202210129593 A CN202210129593 A CN 202210129593A CN 114459024 A CN114459024 A CN 114459024A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
- F23D11/102—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber
- F23D11/103—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber with means creating a swirl inside the mixing chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/38—Nozzles; Cleaning devices therefor
- F23D11/383—Nozzles; Cleaning devices therefor with swirl means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to a flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows, which comprises: the axial airflow mixing section is internally provided with a swirl atomizer, fuel can be sprayed out after being atomized by the swirl atomizer, the axial airflow mixing section is provided with an axial downstream air inlet pipe and an axial upstream air inlet pipe, the axial direction of the axial downstream air inlet pipe and the axial direction of the axial upstream air inlet pipe are tangent to the peripheral surface of the axial airflow mixing section, the communication positions of the axial downstream air inlet pipe and the axial airflow mixing cavity and the communication positions of the axial upstream air inlet pipe and the axial airflow mixing cavity are staggered along the axial direction of the axial airflow mixing section, the swirling directions of the axial downstream air and the axial upstream air are opposite, and the flow ratio of the air flow in the axial downstream air inlet pipe to the air flow in the axial upstream air inlet pipe is 100 percent: 0% to 0%: varying between 100%. By adjusting the flow ratio of two air flows of the forward air and the reverse air, 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.
Description
Technical Field
The invention relates to the technical field of nano material synthesis, in particular to a flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows.
Background
The nano material has the characteristics of small particle size, large specific surface area and the like, and has excellent performance in the aspects of optics and electricity, so that the nano material is widely applied in various fields. At present, the synthesis of the nano-particles mainly adopts a chemical synthesis method and a flame synthesis method, and compared with the chemical synthesis method, the nano-particles obtained by the flame synthesis method have the characteristics of one-step synthesis, high purity, good controllability of particle size of particles and the like, and have wide application prospect in the synthesis of nano-powder materials.
In each type of flame synthesis combustion technology, burners are key devices for flame synthesis. In the swirl flame synthesis burner, the swirl characteristic of the airflow and the swirl construction mode have great influence on the form of nano powder particles. However, in the current swirl flame synthesis burner, the swirl characteristic and the swirl strength of the incident airflow need to be adjusted by adjusting the angle of the swirl vanes, the structure of the whole device is complex, and the angle of the swirl vanes can be continuously adjusted by an external actuator. Therefore, it is necessary to develop a swirl-flow flame synthesis burner structure which also has high flexibility and controllability and is simple in structure.
Disclosure of Invention
Based on the flame synthesis burner capable of realizing flexible adjustment of combined axial and tangential rotational flows, the invention can realize continuous flexible adjustment of the rotational flow direction and the rotational flow strength of the air flow in the axial air flow mixing cavity and the tangential air flow mixing cavity by adjusting the flow ratio of two air flows of the downstream air and the upstream air, and improve the dynamic adjustment capability of the constructed high-temperature backflow area, thereby realizing flexible adjustment and control of the particle size, the form and the crystalline phase of synthesized nano particles, and improving the yield and the production efficiency of the flame synthesized nano particles. In addition, the flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows does not need to be provided with rotational flow blades, an external actuator and other complex structures, the overall structure is simpler, and the manufacturing cost and the difficulty are lower.
Can realize flexible flame synthesis combustor of adjusting of axial, tangential combinatorial nature whirl, include:
the axial airflow mixing section is internally provided with an axial airflow mixing chamber, a swirl atomizer is arranged in the axial airflow mixing chamber, fuel can be sprayed out after being atomized by the swirl atomizer, the axial airflow mixing section is provided with an axial forward flow air inlet pipe and an axial reverse flow air inlet pipe which are communicated with the axial airflow mixing chamber, the axial direction of the axial forward flow air inlet pipe and the axial direction of the axial reverse flow air inlet pipe are tangent to the outer peripheral surface of the axial airflow mixing section, the communication position of the axial forward flow air inlet pipe and the axial airflow mixing chamber and the communication position of the axial reverse flow air inlet pipe and the axial airflow mixing chamber are staggered along the axial direction of the axial airflow mixing section, and air flowing into the axial airflow mixing chamber through the axial forward flow air inlet pipe forms axial forward flow air spirally around the swirl atomizer, the air flowing into the axial airflow mixing cavity through the axial countercurrent air inlet pipe forms axial countercurrent air which spirally advances around the swirl atomizer, the swirling directions of the axial countercurrent air and the axial countercurrent air are opposite, and the flow ratio of the air flow in the axial countercurrent air inlet pipe to the air flow in the axial countercurrent air inlet pipe is 100%: 0% to 0%: varying between 100%.
In one embodiment, the air mixing device further comprises a tangential air flow mixing section, 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 an annular tangential air flow mixing cavity, a tangential forward flow air inlet pipe and a tangential reverse flow air inlet pipe which are communicated with the tangential air flow mixing cavity are installed on the tangential air flow mixing section, the axial direction of the tangential forward flow air inlet pipe and the axial direction of the tangential reverse flow air inlet pipe are tangent to the outer peripheral surface of the tangential air flow mixing section, the communication positions of the tangential forward flow air inlet pipe and the tangential air flow mixing cavity and the communication positions of the tangential reverse flow air inlet pipe and the tangential air flow mixing cavity are staggered along the axial direction of the tangential air flow mixing section, and air flowing into the tangential air flow mixing cavity through the tangential forward flow air inlet pipe spirally advances to form tangential forward flow air surrounding the opening end, the air flowing into the tangential airflow mixing cavity through the tangential counterflow inlet pipe spirally advances to form tangential counterflow air surrounding the opening end, the tangential counterflow air and the tangential counterflow air are opposite in rotation direction and are located on the outer side of the axial counterflow air and the axial counterflow air along the radial direction of the axial airflow mixing section, and the flow ratio of the air flow in the tangential counterflow inlet pipe to the air flow in the tangential counterflow inlet pipe is 100%: 0% to 0%: varying between 100%.
In one embodiment, the tangential airflow mixing section comprises an annular side plate and an end plate connected with the end 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 formed in the end plate, and tangential forward airflow and tangential reverse airflow flow along the circumferential direction of the tangential airflow outlet ring flow and flow out through the notch.
In one embodiment, the fuel injection device further comprises an annular airflow separation section with two open ends, 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 airflow and fuel sprayed out through the open end penetrate through the gap and are sprayed out outwards.
In one embodiment, a height difference exists between the outer end of the gas flow separation section and the outer end of the axial gas flow mixing section along the axial direction of the axial gas flow mixing section.
In one embodiment, along the radial direction of the axial airflow mixing section, the communication position of the axial forward flow air inlet pipe and the axial airflow mixing cavity and the communication position of the axial reverse flow air inlet pipe and the axial airflow mixing cavity are respectively positioned at two ends of the axial airflow mixing section; and/or the like, and/or,
along the radial direction of the tangential airflow mixing section, the communication positions of the tangential forward flow air inlet pipe and the tangential airflow mixing cavity and the communication positions of the tangential reverse flow air inlet pipe and the tangential airflow mixing cavity are respectively positioned at the two ends of the tangential airflow mixing section.
In one of them embodiment, still include fretwork whirl dish, fretwork whirl dish install in the open end, the whirl atomizer passes the centre bore of fretwork whirl dish stretches out outwards, be equipped with a plurality of through-holes of arranging along self circumference interval on the whirl atomizer, follow the radial of fretwork whirl dish, the through-hole is located the outside of centre bore, axial along the current gas with axial counter-current air warp the through-hole blowout.
In one embodiment, the swirl atomizer includes an atomizing nozzle and a main body, the axial airflow mixing section includes a closed end located at an opposite side of the open end, the main body passes through the closed end and extends into the axial airflow mixing chamber and is inserted into the central hole, the main body is fixedly connected to the closed end, the atomizing nozzle is abutted against one side of the hollow swirl disk, which is away from the axial airflow mixing chamber, the atomizing nozzle is fixedly connected to the main body, and fuel can flow in through the main body and is sprayed out through the atomizing nozzle.
In one embodiment, both 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 relative to the end surface of the axial air flow mixing section, the distance between the axial forward flow air inlet pipe and the air flow outlet of the axial air flow mixing section is gradually reduced along the air flow direction in the axial forward flow air inlet pipe, and the distance between the axial reverse flow air inlet pipe and the air flow outlet is gradually reduced along the air flow direction in the axial reverse flow air inlet pipe.
In one embodiment, a precursor central tube and an outer shearing gas tube which extend along the axial direction of the axial gas flow mixing section are arranged inside the swirl atomizer, an outlet of the precursor central tube and an outlet of the outer shearing gas tube are both communicated with the atomizing nozzle, the outer shearing gas tube is sleeved outside the precursor central tube, and air sprayed out of the atomizing nozzle wraps the outside of fuel.
According to the flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows, air flowing into the axial airflow mixing chamber through the axial forward flow air inlet pipe forms axial forward flow air spirally advancing around the rotational flow atomizer, air flowing into the axial airflow mixing chamber through the axial reverse flow air inlet pipe forms axial reverse flow air spirally advancing around the rotational flow atomizer, the rotating directions of the axial forward flow air and the axial reverse flow air are opposite, and the flow ratio of the air flow in the axial forward flow air inlet pipe to the air flow in the axial reverse flow air inlet pipe is 100%: 0% to 0%: when the air flow ratio is changed between 100%, the ratio of the flow of the axial forward air and the flow of the axial reverse air in the axial air flow mixing cavity is changed accordingly. When the flow of the axial downstream air is larger and dominant, the airflow in the axial airflow mixing cavity spirally advances clockwise, and the larger the flow of the axial downstream air is, the larger the rotational flow strength of the clockwise airflow in the axial airflow mixing cavity is; when the flow of the axial counter-flow air is larger and dominant, the air flow in the axial air flow mixing cavity spirally advances anticlockwise, and the larger the flow of the axial counter-flow air is, the larger the swirl strength of the anticlockwise air flow in the axial air flow mixing cavity is. When the flow ratio between the axial countercurrent flow and the axial concurrent flow is 100%: 0% to 0%: in the process of gradually increasing by 100%, the rotational flow strength of the counterclockwise rotating airflow in the axial airflow mixing section 100 is gradually reduced, the counterclockwise rotating airflow is gradually changed to flow along the axial direct current airflow, and then the clockwise rotating airflow is generated, and the rotational flow strength is gradually increased. By adjusting the flow ratio of two air flows of the downstream air and the upstream air, the rotational flow direction and the rotational flow strength of the air flow in the axial air flow mixing cavity and the tangential air flow mixing cavity can be continuously and flexibly adjusted, so that the synthesis process of the nano powder particles can be adjusted flexibly. In addition, when the flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows is adjusted, complex structures such as rotational flow blades and external actuators are not required to be arranged, the overall structure is simpler, and the manufacturing cost and the difficulty are lower.
(1) Compared with the conventional technical scheme of arranging the on-duty flame around the atomized precursor (CH is usually used)4Or natural gas combustion constructs the flame on duty), the invention can realize the self-sustaining combustion of the swirling flame synthesis burner under the combustion organization mode of completely depending on the self-combustion heat release of the atomized liquid fuel and reasonably coupling the surrounding annular swirling air through the structure and air distribution design;
(2) axial cyclone wind and tangential cyclone wind are sequentially arranged in the circumferential direction of the central atomized precursor from inside to outside, and a gas flow separation section is arranged between the axial cyclone wind and the tangential cyclone wind, so that the flexible adjustment of the axial distribution and the radial distribution size and position of a high-temperature flame field is ensured, the rapid and effective adjustment of the nucleation, coalescence and sintering processes of nano powder particles is achieved, and the particle size, form and crystalline phase of the synthesized nano particles are effectively controlled;
(3) the axial cyclone wind and the tangential cyclone wind constructed in the invention can carry out continuous online flexible regulation on the cyclone direction and the cyclone strength of the airflow by regulating the air volume ratio between two airflow streams of the downstream air and the upstream air, thereby increasing flexible regulation measures for the synthesis process of nano powder particles;
(4) the atomized flame synthesis burner disclosed by the invention is simple in structure, convenient to design and process, low in manufacturing cost, and beneficial to improving the synthesis yield of powder materials of a single atomized flame synthesis burner and promoting the large-scale popularization and application of the atomized swirling flame synthesis technology.
Drawings
FIG. 1 is a schematic overall structure diagram of a flame synthesis burner capable of achieving flexible adjustment of combined axial and tangential swirl flow in an embodiment of the invention;
FIG. 2 is a top view of the flame synthesis burner of FIG. 1 with the combination of axial and tangential swirl flexible adjustment;
FIG. 3 is a cross-sectional view taken at B-B of FIG. 2;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 5 is a schematic structural view of a hollow cyclone disk of the flame synthesis burner in FIG. 1, which can realize flexible adjustment of axial and tangential combined cyclone;
FIG. 6 is a schematic view of the gas flow when a counter-clockwise swirling gas flow is established;
FIG. 7 is a schematic view of the gas flow when a clockwise swirling gas flow is established;
FIG. 8 is a schematic view of the airflow direction and flame distribution of the flame synthesis burner of FIG. 1, which can realize flexible adjustment of the axial and tangential combined swirl;
FIG. 9 is a schematic size diagram of the flame synthesis burner of FIG. 1, which can realize flexible adjustment of axial and tangential combined swirl.
Reference numerals:
an axial airflow mixing section 100, an axial airflow mixing chamber 110;
the tangential air flow mixing section 200, the tangential air flow mixing cavity 210, the tangential air flow outlet ring 220, the side plate 230, the end plate 240 and the gap 241;
an axial forward flow inlet pipe 310, an axial reverse flow inlet pipe 320, a tangential forward flow inlet pipe 330 and a tangential reverse flow inlet pipe 340;
the cyclone atomizer 400, the atomizing nozzle 410, the main body part 420, the precursor central tube 421 and the outer layer shearing gas tube 422;
a gas flow separation section 500, a second mounting cavity 510;
the hollow cyclone disk 600, the through hole 610 and the central hole 620;
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 to 3 and 8, a flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined swirl flow according to an embodiment of the present invention includes an axial airflow mixing section 100, an axial airflow mixing chamber 110 is disposed inside the axial airflow mixing section 100, a swirl flow atomizer 400 is installed in the axial airflow mixing chamber 110, fuel can be atomized by the swirl flow atomizer 400 and then sprayed out, an axial forward flow intake pipe 310 and an axial reverse flow intake pipe 320 which are communicated with the axial airflow mixing chamber 110 are installed on the axial airflow mixing section 100, the axial direction of the axial forward flow intake pipe 310 and the axial reverse flow intake pipe 320 are both tangential to the outer peripheral surface of the axial airflow mixing section 100, the communication positions of the axial forward flow intake pipe 310 and the axial airflow mixing chamber 110 and the communication positions of the axial reverse flow intake pipe 320 and the axial airflow mixing chamber 110 are staggered along the axial direction of the axial airflow mixing section 100, the air flowing into the axial airflow mixing chamber 110 through the axial forward flow air inlet pipe 310 forms axial forward flow air spirally advancing around the swirl atomizer 400, the air flowing into the axial airflow mixing chamber 110 through the axial reverse flow air inlet pipe 320 forms axial reverse flow air spirally advancing around the swirl atomizer 400, the rotating directions of the axial forward flow air and the axial reverse flow air are opposite, and the flow ratio of the air flow in the axial forward flow air inlet pipe 310 to the air flow in the axial reverse flow air inlet pipe 320 is 100%: 0% to 0%: varying between 100%.
Specifically, the axial air flow mixing section 100 has a cylindrical shape, the axial air flow mixing section 100 is hollow to form an axial air flow mixing cavity 110, and one end of the axial air flow mixing section 100 is a closed end and the other end is an open end. In the view shown in the drawings, the vertical direction is the axial direction of the axial air flow mixing section 100, the bottom end of the axial air flow 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 air mixing chamber 110. Liquid fuel (e.g., alcohol-based liquid fuel) is atomized into small droplets by the swirl atomizer 400 and ejected upward. The axial forward flow inlet pipe 310 and the axial reverse flow inlet pipe 320 are installed on the axial gas flow mixing section 100 near the closed end. The axial forward flow inlet pipe 310 and the axial reverse flow inlet pipe 320 may be hollow cylinders, hollow cuboids, or the like. When the shape is a hollow cuboid, the axial direction is the length direction of the cuboid. The communication positions of the axial forward flow air inlet pipe 310 and the axial airflow mixing cavity 110 and the communication positions of the axial reverse flow air inlet pipe 320 and the axial airflow mixing cavity 110 are staggered along the axial direction of the axial airflow mixing section 100, so that the axial forward flow air and the axial reverse flow air are prevented from colliding and failing to flow in the expected direction and speed. In the embodiment shown in the drawings, the axial forward flow inlet pipe 310 is located above the axial reverse flow inlet pipe 320, and in other embodiments, the axial reverse flow inlet pipe 320 may be located above the axial forward flow inlet pipe 310. After the air flows into the axial airflow mixing chamber 110 through the axial forward flow air inlet pipe 310 and the axial reverse flow air inlet pipe 320, two spiral upward swirling flows of air around the swirling atomizer 400 are formed, wherein one of the spiral upward swirling flows is an axial forward flow air which spirally advances clockwise, and the other spiral upward swirling flow air is an axial reverse flow air which spirally advances counterclockwise.
When the flow ratio of the air flow in the axially forward flow intake pipe 310 to the air flow in the axially reverse flow intake pipe 320 is at 100%: 0% to 0%: when the air flow ratio is changed between 100%, the flow ratio of the axial forward flow air and the axial reverse flow air in the axial air flow mixing cavity 110 is changed accordingly. When the flow rate of the axial forward flow gas is large and dominant, the gas flow in the axial gas flow mixing cavity 110 spirally advances clockwise, and the larger the flow rate of the axial forward flow gas is, the larger the swirl strength of the clockwise gas flow in the axial gas flow mixing cavity 110 is; when the flow rate of the axial counter-flow air is larger and dominant, the air flow in the axial air flow mixing cavity 110 spirally advances counterclockwise, and the greater the flow rate of the axial counter-flow air, the greater the swirl strength of the counterclockwise air flow in the axial air flow mixing cavity 110. When the flow ratio of the axial countercurrent gas flow to the axial countercurrent gas flow is 100%: 0% to 0%: in the process of gradually increasing by 100%, the rotational flow strength of the counterclockwise rotating airflow in the axial airflow mixing section 100 is gradually reduced, the counterclockwise rotating airflow is gradually changed to flow along the axial direct current airflow, and then the clockwise rotating airflow is generated, and the rotational flow strength is gradually increased. By adjusting the flow ratio of the two air flows of the forward air and the reverse air, the rotational flow direction and the rotational flow strength of the air flow in the axial air flow mixing cavity 110 can be continuously and flexibly adjusted, so that the synthesis process of the nano powder particles can be flexibly adjusted. In addition, when the flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows is adjusted, complex structures such as rotational flow blades and external actuators are not required to be arranged, the overall structure is simpler, and the manufacturing cost and the difficulty are lower.
The swirling wind spirally advances to the top end of the axial airflow mixing section 100 and is ejected outwards. The swirling air surrounds the outer ring of the swirling atomizer 400, and the fuel sprayed out of the swirling atomizer 400 is located inside the swirling air. Under the action of a high-temperature ignition heat source, fuel (such as alcohol-based liquid fuel) is combusted to release heat, and precursor salt (such as nitrate or acetate) dissolved in the fuel is pyrolyzed to generate oxide nanoparticles. The swirling air formed around the atomized precursor can supplement oxygen for continuous combustion of the fuel on one hand, and on the other hand, a low-pressure area formed by an inner ring of the swirling air can promote backflow of high-temperature flue gas generated during combustion of the fuel, so that a high-temperature backflow area is formed in the inner ring of the swirling air, namely a fuel combustion area, the high-temperature backflow area is beneficial to maintaining the high-temperature state of the fuel combustion area, the flame temperature is improved, the combustion flame and the distribution of a high-temperature area are stabilized, the nucleation, coalescence and sintering growth processes of nano oxide particles formed in the combustion process are promoted, and the synthetic yield and quality of nano powder particles are improved.
Referring to fig. 1 to 3 and 8, in some embodiments, a tangential air flow mixing section 200 is further included, the tangential air flow mixing section 200 is sleeved outside an open end of the axial air flow mixing section 100, the tangential air flow mixing section 200 includes an annular tangential air flow mixing chamber 210, a tangential forward flow air inlet pipe 330 and a tangential reverse flow air inlet pipe 340 which are communicated with the tangential air flow mixing chamber 210 are installed on the tangential air flow mixing section 200, axial directions of the tangential forward flow air inlet pipe 330 and the tangential reverse flow air inlet pipe 340 are both tangential to an outer circumferential surface of the tangential air flow mixing section 200, communication positions of the tangential forward flow air inlet pipe 330 and the tangential air flow mixing chamber 210 and communication positions of the tangential reverse flow air inlet pipe 340 and the tangential air flow mixing chamber 210 are staggered along an axial direction of the tangential air flow mixing section 200, air flowing into the tangential air flow mixing chamber 210 through the tangential forward flow air inlet pipe 330 spirally advances to form tangential forward flow air around the open end, the air flowing into the tangential airflow mixing cavity 210 through the tangential counterflow inlet pipe 340 spirally advances to form tangential counterflow air surrounding the opening end, the rotating directions of the tangential counterflow air and the tangential counterflow air are opposite, the tangential counterflow air and the tangential counterflow air are positioned outside the axial counterflow air and the axial counterflow air along the radial direction of the axial airflow mixing section 100, and the flow ratio of the air flow in the tangential counterflow inlet pipe 330 to the air flow in the tangential counterflow inlet pipe 340 is 100%: 0% to 0%: varying between 100%.
Specifically, the tangential air flow mixing section 200 is in the shape of a hollow cylinder with one end open and the other end closed, and the interior of the tangential air flow mixing section 200 is hollow. Tangential co-current air inlet pipe 330 and tangential counter-current air inlet pipe 340 are mounted on tangential air flow mixing section 200 near the bottom end. The tangential forward flow inlet pipe 330 and the tangential reverse flow inlet pipe 340 may be hollow cylindrical, or hollow rectangular parallelepiped. When the shape of the hollow cuboid is adopted, the tangential direction is the length direction of the cuboid. The communication position of the tangential downstream air inlet pipe 330 and the tangential air flow mixing cavity 210 and the communication position of the tangential upstream air inlet pipe 340 and the tangential air flow mixing cavity 210 are staggered along the axial direction of the tangential air flow mixing section 200, so that the tangential downstream air and the tangential upstream air are prevented from colliding and failing to flow in the expected direction and speed. In the embodiment shown in the drawings, the tangential co-current inlet pipe 330 is located above the tangential counter-current inlet pipe 340, and in other embodiments, the tangential counter-current inlet pipe 340 may be located above the tangential co-current inlet pipe 330. After the air flows into the tangential airflow mixing chamber 210 through the tangential downstream air inlet pipe 330 and the tangential upstream air inlet pipe 340, two streams of spiral upward-going swirling air are formed, one stream of the swirling air is tangential downstream air which spirally goes forward clockwise, and the other stream of the swirling air is tangential upstream air which spirally goes counterclockwise.
When the flow ratio of the air flow in tangential co-flow inlet pipe 330 to the air flow in tangential counter-flow inlet pipe 340 is 100%: 0% to 0%: when the air flow ratio changes between 100%, the ratio of the tangential forward air flow to the tangential reverse air flow in the tangential air flow mixing chamber 210 changes. When the tangential down-flow air has a large flow rate and is dominant, the air flow in the tangential air flow mixing cavity 210 spirally advances clockwise, and the larger the flow rate of the tangential down-flow air is, the larger the swirl strength of the clockwise air flow in the tangential air flow mixing cavity 210 is; when the flow rate of the tangential countercurrent gas is large and dominant, the gas flow in the tangential gas flow mixing chamber 210 spirally advances in a counterclockwise direction, and the greater the flow rate of the tangential countercurrent gas, the greater the swirl strength of the counterclockwise gas flow in the tangential gas flow mixing chamber 210. When the flow ratio of the tangential countercurrent gas flow to the tangential countercurrent gas flow is 100%: 0% to 0%: in the process of gradually increasing by 100%, the rotational flow strength of the counterclockwise rotating airflow inside the tangential airflow mixing section 200 is gradually reduced, the counterclockwise rotating airflow is gradually changed to flow along the axial direction of the straight airflow, and then the clockwise rotating airflow is generated, and the rotational flow strength of the clockwise rotating airflow is gradually increased. By adjusting the flow ratio of the two air flows of the forward air and the reverse air, the rotational flow direction and the rotational flow strength of the air flow in the tangential air flow mixing chamber 210 can be continuously and flexibly adjusted, so that the synthesis process of the nano powder particles can be flexibly adjusted. Tangential whirl wind encircles in the outside of the axial whirl wind of the top spun from axial air current mixing chamber 110 to form double-deck whirl wind, replenish the oxygen content in combustion area in grades, and change in the low-pressure region that forms the center, thereby be favorable to improving the ability that whole circumference whirl wind found high temperature backflow region, improve atomizing synthetic flame's self-sustaining combustion ability, and improve flame's stability.
Referring to fig. 3 and 8, in some embodiments, the tangential gas flow mixing section 200 includes a side plate 230 having a ring shape and an end plate 240 connected to an end of the side plate 230, the side plate 230 is hollow to form a tangential gas flow mixing chamber 210, the end plate 240 is hollow to form a tangential gas flow outlet ring 220 communicating with the tangential gas flow mixing chamber 210, the end plate 240 is provided with a notch 241 communicating with the tangential gas flow outlet ring 220, and the tangential downstream gas and the tangential upstream gas flow along a circumferential direction of the tangential gas flow outlet ring 220 and flow out through the notch 241 to realize a flame synthesis burner with flexible swirl adjustment in combination of axial direction and tangential direction. Specifically, the tangential forward flow inlet pipe 330 and the tangential reverse flow inlet pipe 340 are both mounted on the outer circumferential surface of the side plate 230. The end plate 240 is connected to the top end of the side plate 230, and a notch 241 is formed at the center of the end plate 240 and penetrates through the end plate in the axial direction, so that the inner cavity of the end plate 240 is annular to form the tangential airflow outlet ring 220. After the tangential forward flow air and the tangential reverse flow air flowing into the tangential airflow mixing chamber 210 are mixed, tangential swirling wind with airflow having a higher flow rate as a main component is formed. The tangential swirling wind flows into the tangential airflow outlet ring 220 from the tangential airflow mixing chamber 210 and is ejected outwards from a gap 241 at the inner ring of the tangential airflow outlet ring 220. When flowing within the tangential airflow outlet ring 220, the tangential swirling wind will surround the outside of the axial swirling wind ejected from the top end of the axial airflow mixing section 100, thereby creating a double layer swirling wind.
Referring to fig. 3 and 8, in some embodiments, the gas flow separation section 500 is annular and has two open ends, the side plate 230 and the end plate 240 define a first installation cavity, the gas flow separation section 500 is installed on a wall of the first installation cavity, the gas flow separation section 500 includes a second installation cavity 510, an open end of the second installation cavity 510 extends into the second installation cavity, and the gas flow and the fuel sprayed through the open end are sprayed outwards through the notch 241. Specifically, the side plate 230 and the inner side of the end plate 240 form a cylindrical first mounting cavity, the outer side wall of the gas flow separation section 500 is attached to the inner side wall of the side plate 230, and the end wall of the gas flow separation section 500 is attached to the inner wall of the end plate 240. The airflow separation section 500 is open at the top and bottom ends, and is hollow to form a second installation cavity 510. The top end of the axial air flow mixing section 100 extends into the second mounting cavity 510 from the bottom to the top, and the outer side wall of the axial air flow mixing section 100 is attached to the inner side wall of the air flow separation section 500. The flow divider section 500 may be secured between the axial flow mixing section 100 and the tangential flow mixing section 200 by snap-fit, threaded fastener connection, or the like. The airflow separation section 500 is arranged between the axial airflow mixing section 100 and the tangential airflow mixing section 200, so that the radial distance between the inner layer of cyclone wind and the outer layer of cyclone wind can be increased, the inner layer of cyclone wind and the outer layer of cyclone wind are separated as much as possible, and the two layers of cyclone wind are not easy to mix together and interfere with each other.
Referring to fig. 3, 8 and 9, in some embodiments, a height difference exists between the outer end of the flow divider segment 500 and the outer end of the axial flow mixing segment 100 along the axial direction of the axial flow mixing segment 100. Specifically, there is a height difference H between the top end of the flow separation section 500 and the top end of the axial flow mixing section 1001. The fuel is ignited to form flame after being sprayed upwards from the top end of the swirl atomizer 400, within the range of the height difference, the axial swirl wind sprayed upwards from the top end of the axial airflow mixing section 100 can stably surround the outer ring of the flame, and when reaching the notch 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 being incapable of flowing according to the expected speed and flow direction. Preferably, in some embodiments, 0.2H ≦ H1Less than or equal to 0.6H, wherein H is the axial length of tangential air current mixing section 200, when satisfying this numerical range, can guarantee as far as possible that the device has less axial dimension, makes the axial whirl wind that upwards spouts from the top of axial air current mixing section 100 simultaneously can be stable encircle in the flame outer lane.
Referring to fig. 2 and 4, fig. 6 and 7, in some embodiments, along the radial direction of the axial airflow mixing section 100, the communication positions of the axial forward flow air inlet pipe 310 and the axial airflow mixing cavity 110 and the communication positions of the axial reverse flow air inlet pipe 320 and the axial airflow mixing cavity 110 are respectively located at two ends of the axial airflow mixing section 100; and/or the like, and/or,
along the radial direction of the tangential air flow mixing section 200, the communication position of the tangential forward flow air inlet pipe 330 and the tangential air flow mixing cavity 210 and the communication position of the tangential reverse flow air inlet pipe 340 and the tangential air flow mixing cavity 210 are respectively positioned at the two ends of the tangential air flow mixing section 200.
Specifically, the axial forward flow inlet pipe 310 is located on the opposite side of the axial reverse flow inlet pipe 320. The communication position of the axial forward flow inlet pipe 310 and the axial airflow mixing chamber 110 is at the lower end in the view of fig. 4, and the communication position of the axial reverse flow inlet pipe 320 and the axial airflow mixing chamber 110 is at the upper end in the view of fig. 4. When the two communication positions are respectively arranged at the two ends along the radial direction, the distance between the two communication positions is the largest, and the air flows flowing into the two communication positions are not easy to interfere with each other. Similarly, in the view of FIG. 2, tangential co-current inlet duct 330 is located on the opposite side of tangential counter-current inlet duct 340. The tangential co-current air inlet pipe 330 is connected to the tangential air flow mixing chamber 210 at a lower end, and the tangential counter-current air inlet pipe 340 is connected to the tangential air flow mixing chamber 210 at an upper end. Of course, other positions than the illustrated positions are possible, such as at the left and right ends, respectively.
Referring to fig. 2, fig. 3, fig. 5 and fig. 8, in some embodiments, still include fretwork whirl dish 600, fretwork whirl dish 600 is installed in the open end, and whirl atomizer 400 passes fretwork whirl dish 600's centre bore 620 and stretches out outwards, is equipped with a plurality of through-holes 610 of arranging along self circumference interval on whirl atomizer 400, and along fretwork whirl dish 600 radially, through-hole 610 is located the outside of centre bore 620, and axial along the current gas and the blowout of axial through-hole 610 is flowed against current to the gas. Specifically, the hollowed-out cyclone disk 600 is installed at the top opening of the axial airflow mixing section 100, the outer diameter of the hollowed-out cyclone disk is equal to the inner diameter of the axial airflow mixing section 100, the top opening of the axial airflow mixing section 100 is plugged by the hollowed-out cyclone disk 600, and the outer side wall of the hollowed-out cyclone disk 600 abuts against the side wall of the cavity of the axial airflow mixing cavity 110 to realize radial limitation on the hollowed-out cyclone disk 600. The central position of fretwork whirl dish 600 is provided with along the centre bore 620 that self axial link up, and whirl atomizer 400 stretches out outwards through centre bore 620 from lower up. The plurality of through holes 610 are arranged around the central hole 620 and are evenly spaced. The axial swirling wind reaching the top end of the axial air flow mixing section 100 may be ejected upward through each of the through holes 610. In the embodiment shown in the drawings, the through holes 610 have a fan shape, and the circumferential size of the through holes 610 gradually increases in the radial and outward direction of the swirl atomizer 400. Of course, in other embodiments, the through hole 610 may be configured in other shapes, such as circular, oval, rectangular, etc. Because the through hole 610 is not provided with a shielding part, the axial swirling air can smoothly circulate, and the blockage to the rotating air flow is reduced.
Referring to fig. 3 and 8, in some embodiments, the swirl atomizer 400 includes an atomizing nozzle 410 and a main body 420, the axial airflow mixing section 100 includes a closed end located at an opposite side of the open end, the main body 420 passes through the closed end and extends into the axial airflow mixing chamber 110 and is inserted into the central hole 620, the main body 420 is fixedly connected to the closed end, the atomizing nozzle 410 abuts against a side of the hollowed swirl disk 600 departing from the axial airflow mixing chamber 110, the atomizing nozzle 410 is fixedly connected to the main body 420, and fuel can flow in through the main body 420 and is sprayed out through the atomizing nozzle 410. Specifically, the axial air flow mixing section 100 is provided with a mounting hole at a central position of the closed end, and the main body 420 has a rod shape, passes through the mounting hole from bottom to top, and is fixed to the closed end. Specifically, an external thread may be disposed on the outer peripheral surface of the main body portion 420 exposed outside the axial airflow mixing section 100, and a nut may be screwed on the external thread until the nut abuts against the outer end surface of the closed end of the axial airflow mixing section 100, so as to fixedly mount the main body portion 420 on the closed end of the axial airflow mixing section 100. Of course, in other embodiments, the fixing and installation may be realized by clamping or the like. The top end of the main body 420 passes through the central hole 620 and is fixedly connected with the atomizing nozzle 410 above the hollow cyclone disk 600, for example, the top end can be fixed by a screw or can be fixed by clamping. The fuel flows through the inside of the main body 420, flows upward, flows into the atomizing nozzle 410, and is ejected upward through the atomizing nozzle 410.
Referring to fig. 1 and 3, in some embodiments, the axial direction of the axial forward flow inlet pipe 310 and the axial direction of the axial reverse flow inlet pipe 320 are both inclined with respect to the end surface of the axial airflow mixing section 100, and the distance between the axial forward flow inlet pipe 310 and the airflow outlet of the axial airflow mixing section 100 gradually decreases along the airflow direction in the axial forward flow inlet pipe 310, and the distance between the axial reverse flow inlet pipe 320 and the airflow outlet gradually decreases along the airflow direction in the axial reverse flow inlet pipe 320. Specifically, the axial forward flow inlet tube 310 is angled upward in the direction of flow of the gas stream within the axial forward flow inlet tube 310. The axial counterflow inlet pipe 320 is inclined upward in the direction of flow of the gas flow within the axial counterflow inlet pipe 320. The arrangement can ensure that the axial forward flow gas and the axial reverse flow gas have upward flow velocity in the initial stage, so that the gas can flow upwards more easily. Preferably, in some embodiments, α is 5 ≦ α ≦ 20, where α is the angle between the axial direction of the axial forward flow inlet tube 310 and the end face of the axial flow mixing section 100 (i.e., the horizontal direction) and is also the angle between the axial direction of the axial reverse flow inlet tube 320 and the end face of the axial flow mixing section 100 (i.e., the horizontal direction). Similarly, the tangential downstream air inlet 330 is angled upward in the direction of flow of the air stream within the tangential downstream air inlet 330. The tangential counterflow inlet tube 340 is inclined upward in the direction of flow of the gas stream within the tangential counterflow inlet tube 340. 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 may be all disposed horizontally.
Referring to the drawings, in some embodiments, a precursor central tube 421 and an outer shearing gas tube 422 extending in the axial direction of the axial gas flow mixing section 100 are disposed inside the swirl atomizer 400, an outlet of the precursor central tube 421 and an outlet of the outer shearing gas tube 422 are both communicated with the atomizing nozzle 410, the outer shearing gas tube 422 is sleeved outside the precursor central tube 421, and air sprayed from the atomizing nozzle 410 is wrapped outside the fuel. Specifically, the outer shear gas pipe 422 is communicated with a shear gas inlet pipe 720, and the precursor central pipe 421 is communicated with a precursor inlet pipe 710. The precursor inlet tube 710 and the shear gas inlet tube 720 both extend into the axial gas flow mixing chamber 110 through the sidewall of the axial gas flow mixing section 100 and are connected to the main body 420 at corresponding positions. Air flows into outer shear air tube 422 through shear air inlet tube 720 and into atomizing nozzle 410. Precursor flows into the precursor center tube 421 through the precursor inlet tube 710 and into the atomizing nozzle 410. In the atomizing nozzle 410, the precursor is surrounded by air and ejected at high speed. In the spraying process, the air can shear and break the precursor, so that the precursor is atomized, and the liquid precursor is broken into liquid drops with smaller particle size, thereby being easier to fully burn. Preferably, the atomizing nozzle 410 is a hollow cone, the radial dimension of the inner cavity of the atomizing nozzle is gradually reduced from bottom to top, the fuel flows into the conical inner cavity of the atomizing nozzle 410 through the central precursor tube 421, and the air also flows into the conical inner cavity of the atomizing nozzle 410 through the outer shearing air tube 422. By defining the inner cavity of the atomizing nozzle 410 as a cone, the angle of the air when being sprayed can be as far as possible towards the fuel positioned at the central position, thereby intensifying the shearing and crushing of the liquid fuel and ensuring that the atomizing effect is better.
Referring to FIGS. 3, 8, and 9, in some embodiments, α is 5 ≦ 20; h is more than or equal to 1.5d and less than or equal to 3 d; 1.1D is less than or equal to D2≤1.5d；1.1D2≤D1≤1.2D2；0.5D2≤H≤0.9D2；0.2H≤H1Less than or equal to 0.6H. Wherein α is an included angle between the axial direction of the axial forward flow air inlet pipe 310 and the end surface of the axial air flow mixing section 100, and is also an included angle between the axial direction of the axial reverse flow air inlet pipe 320 and the end surface of the axial air flow mixing section 100. H1The height difference existing between the end plate 240 and the top end of the axial flow mixing section 100, H is the axial length of the tangential flow mixing section 200. d is the inner diameter of the axial flow mixing section 100 and h is the axial length of the axial flow mixing chamber 110 within the axial flow mixing section 100. D1Is the inner diameter, D, of the tangential gas flow mixing section 2002Is the outer diameter of the gas flow separation section 500. When the numerical range is met, the burner can realize a better synthesis effect, and is beneficial to the processes of nucleation, coalescence, sintering and growth of nano oxide particles.
Referring to fig. 3 and 8, the liquid fuel self-sustaining combustion flame synthesis burner of the present invention mainly has 4 air streams and liquid streams participating in the process of synthesizing nano powder particles by flame in the combustion process, and specifically includes: axial cyclone wind, tangential cyclone wind, precursor and shearing gas. Wherein, axial whirl wind comprises two air current couplings of axial countercurrent gas and axial following current gas simultaneously, and tangential whirl wind comprises two air current couplings of tangential countercurrent gas and tangential following current gas simultaneously, specifically is:
axial swirling air, including axial countercurrent air, is injected from the axial countercurrent air inlet pipe 320, and axial concurrent air is injected from the axial concurrent air inlet pipe 310, the two air streams are then injected together at high velocity into the interior of the axial air mixing section 100 at different heights and locations, because the direction of the rotating airflow generated between the two is different, when the incident momentum of the axial forward flow air is larger than that of the axial reverse flow air, the clockwise rotation of the axial down-flow air in the axial air flow mixing section 100 will dominate, and produce a clockwise swirling air flow at the upper end of the axial air flow mixing section 100, when the incident momentum of the axial forward flow gas is smaller than the incident momentum of the axial reverse flow gas, the counter-clockwise rotation of the axial reverse flow gas in the axial gas flow mixing section 100 will dominate and generate a counter-clockwise swirling gas flow at the upper end of the axial gas flow mixing section 100. In the process, the flow rate ratio of the axial counter-flow air flow to the axial forward flow air flow is 100%: 0% to 0%: in the process of gradually increasing by 100%, the rotational flow strength of the counterclockwise rotating airflow in the axial airflow mixing section 100 is gradually reduced, the counterclockwise rotating airflow is gradually changed to flow along the axial direct current airflow, and then the clockwise rotating airflow is generated, and the rotational flow strength is gradually increased. Then, the air flow having a certain swirling strength is ejected from the through hole 610 located at the upper portion.
Tangential cyclone wind, including tangential countercurrent air, is injected from the tangential countercurrent air inlet pipe 340, and tangential concurrent air is injected from the tangential concurrent air inlet pipe 330, the two air streams are then injected together at high velocity into the interior of the tangential air mixing section 200 at different heights and locations, because the directions of the rotating air flows generated between the two air flows are different, when the incident momentum of the tangential downstream air is larger than that of the tangential upstream air, the clockwise rotation of the tangential downdraft air within the tangential airflow mixing section 200 will dominate, creating a clockwise swirling airflow flow at the upper end of the tangential airflow mixing section 200, when the incident momentum of the tangential downstream air is smaller than the incident momentum of the tangential upstream air, the counterclockwise rotation of the tangential upstream air inside the tangential air mixing section 200 will dominate and generate a counterclockwise rotational air flow at the upper end of the tangential air mixing section 200. In this process, when the ratio of the tangential counterflow gas flow rate to the tangential counterflow gas flow rate is 100%: 0% to 0%: in the process of gradually increasing by 100%, the rotational flow strength of the counterclockwise rotating airflow inside the tangential airflow mixing section 200 is gradually reduced, the counterclockwise rotating airflow is gradually changed to flow along the axial direction of the straight airflow, and then the clockwise rotating airflow is generated, and the rotational flow strength of the clockwise rotating airflow is gradually increased. Then, the tangential air flow with a certain swirling strength is ejected from the inner side outlet of the tangential air flow outlet ring 220 at a high speed.
The precursor, which is mainly a mixture of a liquid fuel (e.g., an alcohol-based liquid fuel) and a precursor salt (e.g., a salt such as a nitrate or an acetate), enters the precursor central tube 421 through the precursor inlet tube 710 under the action of an external booster pump, and is ejected from the atomizing nozzle 410.
The shear gas, mainly air flow, enters the outer shear gas pipe 422 through the shear gas inlet pipe 720 under the action of the external booster fan, and is sprayed out at high speed from the atomizing nozzle 410.
First, compared to the conventional solution of arranging a duty flame around the atomized precursor (typically using CH)4Or natural gas combustion constructs the flame on duty), the invention can realize the self-sustaining combustion of the swirling flame synthesis burner under the combustion organization mode of completely depending on the self-combustion heat release of the atomized liquid fuel and reasonably coupling the surrounding annular swirling air through the structure and air distribution design;
secondly, axial cyclone wind and tangential cyclone wind are sequentially arranged in the circumferential direction of the central atomized precursor from inside to outside, and a gas flow separation section is arranged between the axial cyclone wind and the tangential cyclone wind, so that the flexible adjustment of the axial distribution and the radial distribution size and position of a high-temperature flame field is ensured, the rapid and effective adjustment of the nucleation, coalescence and sintering processes of nano powder particles is achieved, and the particle size, form and crystalline phase of the synthesized nano particles are effectively controlled;
thirdly, the axial cyclone wind and the tangential cyclone wind constructed in the invention can carry out continuous online flexible regulation on the cyclone direction and the cyclone strength of the airflow by regulating the air volume ratio between two airflow streams of the downstream air and the upstream air, thereby increasing flexible regulation measures for the synthesis process of the nano powder particles;
and thirdly, the atomizing flame synthesis burner has simple structure, is convenient for design and processing, has low manufacturing cost, is beneficial to improving the synthesis yield of the powder material of a single atomizing flame synthesis burner and promotes the large-scale popularization and application of the atomizing swirl flame synthesis technology.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. Can realize flexible flame synthesis combustor of adjusting of axial, tangential combinatorial nature whirl, its characterized in that includes:
the axial airflow mixing section is internally provided with an axial airflow mixing chamber, a swirl atomizer is arranged in the axial airflow mixing chamber, fuel can be sprayed out after being atomized by the swirl atomizer, the axial airflow mixing section is provided with an axial forward flow air inlet pipe and an axial reverse flow air inlet pipe which are communicated with the axial airflow mixing chamber, the axial direction of the axial forward flow air inlet pipe and the axial direction of the axial reverse flow air inlet pipe are tangent to the outer peripheral surface of the axial airflow mixing section, the communication position of the axial forward flow air inlet pipe and the axial airflow mixing chamber and the communication position of the axial reverse flow air inlet pipe and the axial airflow mixing chamber are staggered along the axial direction of the axial airflow mixing section, and air flowing into the axial airflow mixing chamber through the axial forward flow air inlet pipe forms axial forward flow air spirally around the swirl atomizer, the air flowing into the axial airflow mixing cavity through the axial countercurrent air inlet pipe forms axial countercurrent air which spirally advances around the swirl atomizer, the swirling directions of the axial countercurrent air and the axial countercurrent air are opposite, and the flow ratio of the air flow in the axial countercurrent air inlet pipe to the air flow in the axial countercurrent air inlet pipe is 100%: 0% to 0%: varying between 100%.
2. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows according to claim 1, further comprising a tangential airflow mixing section, wherein the tangential airflow mixing section is sleeved outside the opening end of the axial airflow mixing section, the tangential airflow mixing section comprises an annular tangential airflow mixing chamber, the tangential airflow mixing section is provided with a tangential forward flow air inlet pipe and a tangential reverse flow air inlet pipe which are communicated with the tangential airflow mixing chamber, the axial direction of the tangential forward flow air inlet pipe and the axial direction of the tangential reverse flow air inlet pipe are both tangent to the outer peripheral surface of the tangential airflow mixing section, the communication positions of the tangential forward flow air inlet pipe and the tangential airflow mixing chamber and the communication positions of the tangential reverse flow air inlet pipe and the tangential airflow mixing chamber are staggered along the axial direction of the tangential airflow mixing section, the air flowing into the tangential airflow mixing chamber through the tangential forward flow air inlet pipe spirally advances to form tangential forward flow air surrounding the opening end, the air flowing into the tangential airflow mixing chamber through the tangential reverse flow air inlet pipe spirally advances to form tangential reverse flow air surrounding the opening end, the tangential forward flow air and the tangential reverse flow air are opposite in rotation direction and are located on the outer side of the axial forward flow air and the axial reverse flow air along the radial direction of the axial airflow mixing section, and the flow ratio of the air flow in the tangential forward flow air inlet pipe to the air flow in the tangential reverse flow air inlet pipe is 100%: 0% to 0%: varying between 100%.
3. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows according to claim 2, wherein the tangential airflow mixing section comprises an annular side plate and an end plate connected with the end 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 flow gas and the tangential reverse flow gas flow along the circumferential direction of the tangential airflow outlet ring and flow out through the notch.
4. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined swirls as claimed in claim 3, further comprising an annular airflow separation section with openings at two ends, wherein a first installation cavity is defined by the side plate and the end plate, the airflow separation section is installed on a 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 airflow and fuel sprayed out through the open end pass through the gap and are sprayed out.
5. The flexible swirl axial and tangential combined flame synthesis burner of claim 4, wherein a height difference exists between the outer end of the flow separation section and the outer end of the axial flow mixing section along the axial direction of the axial flow mixing section.
6. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows as claimed in claim 2, wherein along the radial direction of the axial gas flow mixing section, the communication positions of the axial forward flow gas inlet pipe and the axial gas flow mixing cavity and the communication positions of the axial reverse flow gas inlet pipe and the axial gas flow mixing cavity are respectively located at two ends of the axial gas flow mixing section; and/or the like, and/or,
along the radial direction of the tangential airflow mixing section, the communication positions of the tangential forward flow air inlet pipe and the tangential airflow mixing cavity and the communication positions of the tangential reverse flow air inlet pipe and the tangential airflow mixing cavity are respectively positioned at the two ends of the tangential airflow mixing section.
7. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow according to any one of claims 2 to 6, further comprising a hollowed rotational flow disk, wherein the hollowed rotational flow disk is mounted at the opening end, the rotational flow atomizer penetrates through a center hole of the hollowed rotational flow disk and extends outwards, a plurality of through holes are formed in the rotational flow atomizer and are circumferentially distributed at intervals, the through holes are located on the outer side of the center hole in the radial direction of the hollowed rotational flow disk, and the axial forward flow gas and the axial reverse flow gas are ejected through the through holes.
8. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows according to claim 7, wherein the rotational flow atomizer comprises an atomizing nozzle and a main body part, the axial airflow mixing section comprises a closed end located at the opposite side of the open end, the main body part penetrates through the closed end and extends into the axial airflow mixing chamber and is inserted into the central hole, the main body part is fixedly connected to the closed end, the atomizing nozzle is abutted against one side of the hollowed rotational flow disk, which is far away from the axial airflow mixing chamber, the atomizing nozzle is fixedly connected with the main body part, and fuel can flow in through the main body part and can be sprayed out through the atomizing nozzle.
9. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined swirl as claimed in claim 1, wherein the axial direction of the axial forward flow inlet pipe and the axial direction of the axial reverse flow inlet pipe are both inclined with respect to the end surface of the axial gas flow mixing section, and along the gas flow direction in the axial forward flow inlet pipe, the distance between the axial forward flow inlet pipe and the gas flow outlet of the axial gas flow mixing section is gradually reduced, and along the gas flow direction in the axial reverse flow inlet pipe, the distance between the axial reverse flow inlet pipe and the gas flow outlet is gradually reduced.
10. The flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flows according to claim 1, wherein a precursor central tube and an outer shearing gas tube extending along the axial direction of the axial gas flow mixing section are arranged inside the rotational flow atomizer, an outlet of the precursor central tube and an outlet of the outer shearing gas tube are both communicated with the atomizing nozzle, the outer shearing gas tube is sleeved outside the precursor central tube, and air sprayed from the atomizing nozzle wraps the outside of fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210129593.6A CN114459024B (en) | 2022-02-11 | 2022-02-11 | Flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible adjustment |
Applications Claiming Priority (1)
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| CN202210129593.6A CN114459024B (en) | 2022-02-11 | 2022-02-11 | Flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible adjustment |
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| CN114459024B (en) | 2023-05-23 |
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