CN114459024B - Flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible adjustment - Google Patents
Flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible adjustment Download PDFInfo
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- CN114459024B CN114459024B CN202210129593.6A CN202210129593A CN114459024B CN 114459024 B CN114459024 B CN 114459024B CN 202210129593 A CN202210129593 A CN 202210129593A CN 114459024 B CN114459024 B CN 114459024B
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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
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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
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 flow.
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 nanoparticle synthesis mainly adopts chemical synthesis and flame synthesis methods, and compared with the chemical synthesis method, the nanoparticle obtained by adopting the flame synthesis method has the characteristics of one-step synthesis, high purity, good controllability of particle size of particles and the like, and has wide application prospect in the aspect of the synthesis of nano powder materials.
In various types of flame synthesis combustion technology, burners are key devices for flame synthesis. In a 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 blades, the structure of the whole device is complex, and the continuous adjustment of the angle of the swirl blades needs to be realized by an external actuator. Therefore, there is a need to develop a swirl flame synthesis burner structure that also has high flexibility in regulation and control and is simpler in structure.
Disclosure of Invention
Based on the method, the invention provides the flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow, and the flow ratio of the forward flow air to the backward flow air can be adjusted to realize flexible adjustment of the rotational flow direction and rotational flow strength of the air flow in the axial air flow mixing cavity and the tangential air flow mixing cavity, thereby improving the dynamic adjustment capability of the constructed high-temperature backflow area, realizing flexible adjustment of the grain diameter, the form and the crystal 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 flow does not need to be provided with a rotational flow blade, an external actuator and other complex structures, and has the advantages of simpler overall structure and lower manufacturing cost and difficulty.
A flame synthesis burner capable of achieving axial and tangential combined swirl flexible adjustment, comprising:
the fuel can be sprayed out after being atomized by the cyclone atomizer, an axial concurrent air inlet pipe communicated with the axial air mixing cavity and an axial countercurrent air inlet pipe are arranged on the axial air 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 peripheral surface of the axial air mixing section, the communication positions of the axial concurrent air inlet pipe and the axial air mixing cavity and the communication positions of the axial countercurrent air inlet pipe and the axial air mixing cavity are staggered along the axial direction of the axial air mixing section, air flowing into the axial air mixing cavity through the axial concurrent air inlet pipe forms axial concurrent air which spirally advances around the cyclone 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 cyclone atomizer, the axial concurrent air flow and the axial countercurrent air inlet pipe are opposite, and the air flow ratio of the air flowing into the axial air inlet pipe and the axial countercurrent air inlet pipe is 100%:0% to 0%: variation between 100%.
In one embodiment, the device further comprises a tangential airflow mixing section, the tangential airflow mixing section is sleeved outside the opening end of the axial airflow mixing section, the tangential airflow mixing section comprises a circular tangential airflow mixing cavity, a tangential downstream air inlet pipe and a tangential upstream air inlet pipe which are communicated with the tangential airflow mixing cavity are arranged on the tangential airflow mixing section, the axial direction of the tangential downstream air inlet pipe and the axial direction of the tangential upstream air inlet pipe are tangential to the outer circumferential surface of the tangential airflow mixing section, the communication position of the tangential downstream air inlet pipe and the tangential airflow mixing cavity is staggered along the axial direction of the tangential airflow mixing section, the air which flows into the tangential airflow mixing cavity through the tangential downstream air inlet pipe is spirally advanced to form tangential downstream air which surrounds the opening end, the air which flows into the tangential airflow mixing cavity through the tangential downstream air inlet pipe is spirally advanced to form tangential upstream air which surrounds the opening end, the air flow rate of the tangential downstream air inlet pipe is opposite to the tangential downstream air inlet pipe and the tangential downstream air inlet pipe is 100%, and the air flow rate of the tangential downstream air flowing into the tangential airflow mixing cavity is opposite to the tangential downstream air inlet pipe, and the tangential downstream air flow is radially opposite to the tangential air inlet pipe, and the tangential downstream air flow mixing section is directly opposite to the air flow direction: 0% to 0%: variation between 100%.
In one embodiment, the tangential airflow mixing section comprises a circular 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 flow gas and the tangential reverse flow gas flow along the circumferential direction of the tangential airflow outlet ring and flow out of the flame synthesis burner capable of realizing flexible adjustment of axial and tangential combined rotational flow through the notch.
In one embodiment, the air flow separation device further comprises an annular air flow separation section with two open ends, the side plate and the end plate define a first installation cavity, the air flow separation section is installed on the cavity wall of the first installation cavity, the air flow separation section comprises a second installation cavity, the open end stretches into the second installation cavity, and air flow and fuel sprayed out from the open end pass through the notch and are sprayed out.
In one embodiment, along the axial direction of the axial airflow mixing section, a height difference exists between the outer end of the airflow separation section and the outer end of the axial airflow mixing section.
In one embodiment, along the radial direction of the axial airflow mixing section, the communication position of the axial downstream air inlet pipe and the axial airflow mixing cavity and the communication position of the axial upstream air inlet pipe and the axial airflow mixing cavity are respectively positioned at two ends of the axial airflow 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.
In one embodiment, the cyclone atomizer further comprises a hollow cyclone disk, the hollow cyclone disk is mounted at the opening end, the cyclone atomizer penetrates through a central hole of the hollow cyclone disk to extend outwards, a plurality of through holes are formed in the cyclone atomizer at intervals along the circumferential direction of the cyclone atomizer, the through holes are located on the outer side of the central hole along the radial direction of the hollow cyclone disk, and axial downstream air and axial upstream air are sprayed out through the through holes.
In one embodiment, the cyclone 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 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, away from the axial airflow mixing cavity, of the hollow cyclone disk, the atomizing nozzle is fixedly connected with the main body part, and fuel can flow in through the main body part and be sprayed out through the atomizing nozzle.
In one embodiment, 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 face 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 of the axial reverse 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 of the axial reverse flow air inlet pipe.
In one embodiment, the swirl atomizer is internally provided with a precursor central tube and an outer shearing air tube which extend along the axial direction of the axial airflow mixing section, the outlet of the precursor central tube and the 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 by the atomizing nozzle is wrapped outside the fuel.
According to the flame synthesis burner capable of realizing axial and tangential combined rotational flow flexible regulation, air flowing into the axial airflow mixing cavity through the axial forward flow air inlet pipe forms axial forward flow air which spirally advances around the rotational flow atomizer, air flowing into the axial airflow mixing cavity through the axial reverse flow air inlet pipe forms axial reverse flow air which spirally advances around the rotational flow atomizer, the rotational directions of the axial forward flow air and the axial reverse flow air are opposite, and when 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 flow rate is changed between 100%, the flow rate ratio of the axial forward flow gas and the axial backward flow gas in the axial airflow mixing cavity is changed. When the flow rate of the axial clockwise air is larger and dominant, the air flow in the axial air flow mixing cavity advances clockwise in a spiral way, and the larger the flow rate of the axial clockwise air flow, the larger the rotational flow strength of the clockwise air flow in the axial air flow mixing cavity; when the flow rate of the axial countercurrent gas is larger and dominant, the gas flow in the axial gas flow mixing cavity advances in a anticlockwise spiral manner, and the larger the flow rate of the axial countercurrent gas is, the larger the rotational flow strength of the anticlockwise gas flow in the axial gas 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 the air flow between 100%, the rotational flow intensity of the counterclockwise rotational air flow in the axial air flow mixing section 100 is gradually reduced, the rotational flow is gradually changed into the flow along the axial direct-current air flow, then the clockwise rotational air flow is generated, and the rotational flow intensity is gradually increased. The rotational flow direction and the rotational flow strength of the air flows in the axial air flow mixing cavity and the tangential air flow mixing cavity can be continuously and flexibly adjusted by adjusting the flow ratio of the forward air flow to the backward air flow, so that the synthesis process of nano powder particles can be flexibly adjusted. In addition, this can realize that axial, tangential combination nature whirl is nimble when adjusting flame synthesis combustor, need not to set up comparatively complicated structures such as swirl vane, external executor, overall structure is simpler, and manufacturing cost and degree of difficulty are all lower.
(1) Compared with the conventional technical proposal of arranging an on-duty flame around the atomized precursor (generally using CH 4 Or natural gas combustion to construct on-duty flame), the self-sustaining combustion of the cyclone flame synthesis burner can be realized by the structure and the air distribution design under the combustion organization mode of completely relying on self combustion heat release of atomized liquid fuel and reasonable coupling of surrounding annular cyclone air;
(2) The axial swirl wind and the tangential swirl wind are sequentially arranged from inside to outside in the circumferential direction of the central atomization precursor, and an airflow separation section is arranged between the axial swirl wind and the tangential swirl wind, so that the flexible adjustment of the axial distribution and 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 realized, and the particle size, morphology and crystalline phase of synthesized nano particles are effectively controlled;
(3) The axial swirl wind and the tangential swirl wind constructed in the invention can continuously and flexibly adjust the swirl direction and the swirl strength of the air flow on line by adjusting the air volume ratio between the two air flows of the forward air flow and the reverse air flow, thereby increasing flexible adjustment measures for the synthesis process of nano powder particles;
(4) The atomizing flame synthesis burner has the advantages of simple structure, convenience in design and processing, low manufacturing cost, contribution to improving the powder material synthesis yield of a single atomizing flame synthesis burner and promotion of large-scale popularization and application of atomizing swirl flame synthesis technology.
Drawings
FIG. 1 is a schematic view of the overall structure of a flame synthesizing burner capable of realizing flexible adjustment of axial and tangential combined swirl in an embodiment of the invention;
FIG. 2 is a top view of the flame synthesizing burner of FIG. 1 that enables axial and tangential combined swirl flexible adjustment;
FIG. 3 is a cross-sectional view at B-B in FIG. 2;
FIG. 4 is a cross-sectional view at A-A of FIG. 1;
FIG. 5 is a schematic structural view of a hollow swirl disk of the flame synthesis burner of FIG. 1 capable of realizing flexible adjustment of axial and tangential combined swirl;
FIG. 6 is a schematic flow diagram of an airflow when constructing a counter-clockwise swirling airflow;
FIG. 7 is a schematic flow diagram of the airflow when constructing a clockwise swirling airflow;
FIG. 8 is a schematic diagram of the flow direction and flame distribution of the flame synthesizing burner of FIG. 1 that enables flexible adjustment of the axial and tangential combined swirl;
FIG. 9 is a schematic illustration of the dimensions of the flame synthesizing burner of FIG. 1 that enables axial and tangential combined swirl flexible adjustment.
Reference numerals:
an axial air flow mixing section 100, an axial air flow 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;
an axial forward flow intake pipe 310, an axial reverse flow intake pipe 320, a tangential forward flow intake pipe 330, and a tangential reverse flow intake pipe 340;
an airflow separation section 500, a second mounting cavity 510;
the hollow swirl disk 600, the through hole 610 and the center hole 620;
a precursor inlet line 710, a shear gas inlet line 720.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" 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 are used herein for illustrative purposes only and are not meant to be the only embodiment.
Referring to fig. 1 to 3, and fig. 8, a flame synthesis combustor capable of realizing axial and tangential combined rotational flow flexible adjustment provided by 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 rotational flow atomizer 400 is mounted in the axial airflow mixing chamber 110, fuel can be atomized by the rotational flow atomizer 400 and then sprayed out, an axial forward air inlet pipe 310 communicated with the axial airflow mixing chamber 110 and an axial reverse air inlet pipe 320 are mounted on the axial airflow mixing section 100, both axial directions of the axial forward air inlet pipe 310 and axial reverse air inlet pipe 320 are tangential to an outer peripheral surface of the axial airflow mixing section 100, a communication position of the axial forward air inlet pipe 310 and the axial airflow mixing chamber 110, a communication position of the axial reverse air inlet pipe 320 and the axial airflow mixing chamber 110 are staggered along an axial direction of the axial airflow mixing section 100, air flowing into the axial forward air mixing chamber 110 through the axial forward air inlet pipe 310 forms an axial forward air flow around the rotational flow atomizer 400, air flowing into the axial reverse air inlet pipe 320 forms an axial forward air flow around the rotational flow atomizer 400, and an air flow ratio of the axial reverse air inlet pipe 320 is 100%:0% to 0%: variation between 100%.
Specifically, the axial air-flow mixing section 100 has a cylindrical shape, the interior of the axial air-flow mixing section 100 is hollow to form an axial air-flow mixing chamber 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 drawing, the up-down 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 flow mixing chamber 110. Liquid fuel (e.g., alcohol-based liquid fuel) is atomized by the swirl atomizer 400 to be formed into droplets and ejected upward. The axial forward flow inlet pipe 310 and the axial reverse flow inlet pipe 320 are installed on the axial air flow mixing section 100 at a position near the closed end. The axial forward flow air inlet pipe 310 and the axial backward flow air inlet pipe 320 can be in a hollow cylinder shape or in a hollow cuboid shape. When the hollow cuboid is formed, the axial direction of the hollow cuboid is the length direction of the cuboid. The communication position of the axial forward flow air inlet pipe 310 and the axial air flow mixing cavity 110 and the communication position of the axial backward flow air inlet pipe 320 and the axial air flow mixing cavity 110 are staggered along the axial direction of the axial air flow mixing section 100, so as to prevent the axial forward flow air from colliding with the axial backward flow air and failing to flow in the expected direction and speed. In the embodiment shown in the drawings, the axial forward flow air inlet pipe 310 is located above the axial reverse flow air inlet pipe 320, and in other embodiments, the axial reverse flow air inlet pipe 320 may be located above the axial forward flow air inlet pipe 310. After the air flows into the axial air flow mixing cavity 110 through the axial downstream air inlet pipe 310 and the axial upstream air inlet pipe 320, two spiral upward-advancing rotational flow air flows around the rotational flow atomizer 400 are formed, wherein one air flow is clockwise spiral forward axial downstream air flow, and the other air flow is anticlockwise spiral forward axial upstream air flow.
When the flow ratio of the air flow in the axial forward flow air intake pipe 310 to the air flow in the axial reverse flow air intake pipe 320 is 100%:0% to 0%: when the flow rate is changed between 100%, the flow rate ratio of the axial forward flow gas and the axial backward flow gas in the axial airflow mixing cavity 110 is changed. When the flow rate of the axial clockwise air is larger and dominant, the air flow in the axial air flow mixing cavity 110 advances in a clockwise spiral manner, and the larger the flow rate of the axial clockwise air flow, the larger the rotational flow strength of the clockwise air flow in the axial air flow mixing cavity 110; when the flow rate of the axial counter-current air is larger and dominant, the air flow in the axial air flow mixing cavity 110 advances in a counterclockwise spiral manner, and the larger the flow rate of the axial counter-current air is, the larger the rotational flow strength of the counterclockwise air flow in the axial air flow mixing cavity 110 is. When the flow ratio of the axial countercurrent flow to the axial concurrent flow is 100%:0% to 0%: in the process of gradually increasing the air flow between 100%, the rotational flow intensity of the counterclockwise rotational air flow in the axial air flow mixing section 100 is gradually reduced, the rotational flow is gradually changed into the flow along the axial direct-current air flow, then the clockwise rotational air flow is generated, and the rotational flow intensity is gradually increased. By adjusting the flow ratio of the forward flow air and the backward flow air, the rotational flow direction and the rotational flow strength of the air flow in the axial air flow mixing cavity 110 can be flexibly adjusted, so that the nano powder particle synthesis process can be flexibly adjusted. In addition, this can realize that axial, tangential combination nature whirl is nimble when adjusting flame synthesis combustor, need not to set up comparatively complicated structures such as swirl vane, external executor, overall structure is simpler, and manufacturing cost and degree of difficulty are all lower.
The swirling wind is spirally advanced to the top end of the axial air flow mixing section 100 and is outwardly ejected. The swirling wind surrounds the outer ring of the swirling atomizer 400, and the fuel sprayed through the swirling atomizer 400 will be located inside the swirling wind. Under the action of the high-temperature ignition heat source, the fuel (such as alcohol-based liquid fuel) generates combustion heat, and precursor salts (nitrate, acetate and other salts) dissolved in the fuel are pyrolyzed, so that oxide nano particles are generated. On one hand, the swirling wind formed around the atomized precursor can supplement oxygen for continuous combustion of fuel, on the other hand, the low-pressure area formed by the inner ring of the swirling wind can promote backflow of high-temperature flue gas generated during fuel combustion, so that the high-temperature backflow area is formed in the inner ring of the swirling wind, namely the fuel combustion area, which is beneficial to keeping the high-temperature state of the fuel combustion area, improving the flame temperature, stabilizing the distribution of combustion flame and the high-temperature area, and promoting the nucleation, coalescence and sintering growth processes of nano oxide particles formed in the combustion process, so that the synthesis yield and quality of nano powder particles are improved.
Referring to fig. 1 to 3, and fig. 8, in some embodiments, the tangential airflow mixing section 200 is sleeved outside the opening end of the axial airflow mixing section 100, the tangential airflow mixing section 200 includes a tangential airflow mixing chamber 210 having a ring shape, a tangential downstream air inlet pipe 330 and a tangential upstream air inlet pipe 340 which are communicated with the tangential airflow mixing chamber 210 are mounted on the tangential airflow mixing section 200, the axial direction of the tangential downstream air inlet pipe 330, the axial direction of the tangential upstream air inlet pipe 340 and the outer circumferential surface of the tangential airflow mixing section 200 are tangential, the communication position of the tangential downstream air inlet pipe 330 and the tangential airflow mixing chamber 210 is staggered along the axial direction of the tangential airflow mixing section 200, the air flowing into the tangential airflow mixing chamber 210 through the tangential downstream air inlet pipe 330 is spirally advanced to form a tangential downstream air flow around the opening end, the tangential downstream air inlet pipe 340 is spirally advanced to form a tangential downstream air flow around the opening end, and the tangential downstream air inlet pipe 340 is positioned at a ratio of the tangential downstream air flow to the tangential downstream air inlet pipe 100% of the tangential downstream air inlet pipe: 0% to 0%: variation between 100%.
Specifically, the tangential airflow mixing section 200 has a hollow cylindrical shape with one end open and the other end closed, and the inside of the tangential airflow mixing section 200 is hollow. The tangential downstream air inlet pipe 330 and the tangential upstream air inlet pipe 340 are installed at a position near the bottom end of the tangential air flow mixing section 200. The tangential downstream air inlet pipe 330 and the tangential upstream air inlet pipe 340 may have a hollow cylindrical shape or a hollow rectangular shape. When the rectangular solid is hollow, the tangential direction is the length direction of the rectangular solid. The communication position of the tangential downstream air inlet pipe 330 and the tangential air flow mixing chamber 210, and the communication position of the tangential upstream air inlet pipe 340 and the tangential air flow mixing chamber 210 are staggered along the axial direction of the tangential air flow mixing section 200, so as to prevent the tangential downstream air from colliding with the tangential upstream air and failing to flow in the expected direction and speed. In the embodiment shown in the drawings, the tangential downstream air intake pipe 330 is located above the tangential upstream air intake pipe 340, and in other embodiments, the tangential upstream air intake pipe 340 may be located above the tangential downstream air intake 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 spiral upwards-advancing rotational flow air flows are formed, wherein one air flow is the tangential downstream air which advances clockwise in spiral manner, and the other air flow is the tangential upstream air which advances anticlockwise in spiral manner.
When the flow ratio of the air flow in the tangential downstream air intake pipe 330 to the air flow in the tangential upstream air intake pipe 340 is 100%:0% to 0%: when the flow rate is changed between 100%, the flow rate ratio of tangential forward flow air and tangential backward flow air in the tangential airflow mixing cavity 210 is changed. When the flow rate of the tangential downstream air is larger and dominant, the air flow in the tangential air flow mixing cavity 210 advances clockwise in a spiral manner, and the larger the flow rate of the tangential downstream air is, the larger the rotational flow 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 larger and dominant, the gas flow in the tangential gas flow mixing chamber 210 advances in a counterclockwise spiral, and the larger the flow rate of the tangential countercurrent gas, the larger the swirl strength of the counterclockwise gas flow in the tangential gas flow mixing chamber 210. When the flow ratio of tangential countercurrent flow to tangential concurrent flow is 100%:0% to 0%: in the process of gradually increasing the air flow between 100%, the anti-clockwise rotation air flow rotational flow intensity in the tangential air flow mixing section 200 is gradually reduced, the air flow is gradually changed into the axial direct current air flow, then the clockwise rotation air flow is generated, and the rotational flow intensity is gradually increased. By adjusting the flow ratio of the forward flow air and the backward flow air, the rotational flow direction and the rotational flow strength of the air flow in the tangential air flow mixing cavity 210 can be flexibly adjusted continuously, so that the nano powder particle synthesis process can be flexibly adjusted. The tangential cyclone wind surrounds the outside of the axial cyclone wind sprayed from the top end of the axial airflow mixing chamber 110, thereby forming a double-layer cyclone wind, classifying and supplementing the oxygen amount of the combustion zone, and forming a central low-pressure zone more easily, thereby being beneficial to improving the capability of the whole circumferential cyclone wind to construct a high-temperature backflow zone, improving the self-sustaining combustion capability of atomized synthetic flame and improving the stability of flame.
Referring to fig. 3 and 8, in some embodiments, the tangential airflow mixing section 200 includes a circular side plate 230 and an end plate 240 connected to an end of the side plate 230, the side plate 230 is hollow inside to form the tangential airflow mixing chamber 210, the end plate 240 is hollow inside to form a tangential airflow outlet ring 220 in communication with the tangential airflow mixing chamber 210, the end plate 240 is provided with a notch 241 in communication with the tangential airflow outlet ring 220, and tangential forward flow gas and tangential reverse flow gas flow along a circumferential direction of the tangential airflow outlet ring 220 and flow out of the flame synthesis burner through the notch 241 to achieve flexible adjustment of axial and tangential combined swirl. Specifically, the tangential downstream air inlet pipe 330 and the tangential upstream air inlet pipe 340 are both mounted on the outer peripheral 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 penetrating axially is provided at the center of the end plate 240, so that the inner cavity of the end plate 240 is annular to form the tangential airflow outlet ring 220. After the tangential downstream air flowing into the tangential air flow mixing chamber 210 is mixed with the tangential upstream air, a tangential cyclone air mainly composed of an air flow with a higher flow rate is formed. The tangential swirl wind flows from the tangential airflow mixing chamber 210 into the tangential airflow outlet ring 220 and is ejected outward from the notch 241 at the inner periphery of the tangential airflow outlet ring 220. As the tangential swirl wind flows within the tangential airflow outlet ring 220, it will surround the outside of the axial swirl wind ejected from the tip of the axial airflow mixing section 100, thereby constructing a double layer swirl wind.
Referring to fig. 3 and 8, in some embodiments, the air 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 air flow separation section 500 is installed on a cavity wall of the first installation cavity, the air flow separation section 500 includes a second installation cavity 510, the open end extends into the second installation cavity 510, and the air flow and the fuel ejected through the open end are ejected outwards through the notch 241. Specifically, the side plate 230 and the inner side of the end plate 240 form a columnar first installation cavity, the outer side wall of the airflow separation section 500 is attached to the inner side wall of the side plate 230, and the end wall of the airflow separation section 500 is attached to the inner wall of the end plate 240. The top and bottom ends of the airflow dividing section 500 are open, and hollow to form a second installation cavity 510. The top end of the axial air flow mixing section 100 extends into the second installation cavity 510 from bottom to 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 airflow separation section 500 may be secured between the axial airflow mixing section 100 and the tangential airflow mixing section 200 by a snap fit, threaded fastener connection, or the like. By arranging the air flow separation section 500 between the axial air flow mixing section 100 and the tangential air flow mixing section 200, the radial distance between the inner layer of rotational flow air and the outer layer of rotational flow air can be increased, the inner layer of rotational flow air and the outer layer of rotational flow air can be separated as far as possible, and the two layers of rotational flow air 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 airflow dividing section 500 and the outer end of the axial airflow mixing section 100 along the axial direction of the axial airflow mixing section 100. Specifically, there is a height difference H between the top end of the airflow separation section 500 and the top end of the axial airflow mixing section 100 1 . Fuel is ejected upward from the tip of the swirl atomizer 400And then ignited to form a flame, in the height difference range, the axial swirl wind sprayed upwards from the top end of the axial airflow mixing section 100 can stably encircle the flame outer ring, and when reaching the notch 241, the tangential swirl wind is added again to form two layers of swirl wind, so that the two layers of swirl wind mutually interfere and cannot flow according to the expected speed and the expected flow direction. Preferably, in some embodiments, 0.2 H.ltoreq.H 1 And less than or equal to 0.6H, wherein H is the axial length of the tangential airflow mixing section 200, and when the numerical range is met, the device can be ensured to have smaller axial dimension as much as possible, and simultaneously, the axial swirl wind sprayed upwards from the top end of the axial airflow mixing section 100 can stably encircle the flame outer ring.
Referring to fig. 2 and fig. 4, and 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 inlet pipe 310 and the axial airflow mixing chamber 110, and the communication position of the axial upstream air inlet pipe 320 and the axial airflow mixing chamber 110 are respectively located at two ends of the axial airflow mixing section 100; and/or the number of the groups of groups,
In the radial direction of the tangential airflow mixing section 200, the communication position of the tangential downstream air inlet pipe 330 and the tangential airflow mixing chamber 210 and the communication position of the tangential upstream air inlet pipe 340 and the tangential airflow mixing chamber 210 are respectively located at two ends of the tangential airflow mixing section 200.
Specifically, the axial forward flow air inlet pipe 310 is located on the opposite side of the axial reverse flow air inlet pipe 320. The communication position between the axial forward flow air inlet pipe 310 and the axial air flow mixing chamber 110 is located at the lower end in the view of fig. 4, and the communication position between the axial reverse flow air inlet pipe 320 and the axial air flow mixing chamber 110 is located at the upper end in the view of fig. 4. When the two communicating positions are respectively arranged at the two ends along the radial direction, the distance between the two communicating positions is the largest, and the respective inflows are not easy to interfere with each other. Similarly, in the view of fig. 2, the tangential downstream air inlet pipe 330 is located on the opposite side of the tangential upstream air inlet pipe 340. The communication position of the tangential downstream air inlet pipe 330 and the tangential air flow mixing chamber 210 is located at the lower end, and the communication position of the tangential upstream air inlet pipe 340 and the tangential air flow mixing chamber 210 is located at the upper end. Of course, other locations besides those shown are possible, such as at the left and right ends, respectively.
Referring to fig. 2, 3, 5 and 8, in some embodiments, the cyclone atomizer further includes a hollow cyclone disk 600, the hollow cyclone disk 600 is mounted at the open end, the cyclone atomizer 400 extends outwards through a central hole 620 of the hollow cyclone disk 600, a plurality of through holes 610 are formed in the cyclone atomizer 400 and are arranged at intervals along the circumferential direction of the cyclone atomizer 400, the through holes 610 are located at the outer side of the central hole 620 along the radial direction of the hollow cyclone disk 600, and the axial forward flow gas and the axial reverse flow gas are sprayed out through the through holes 610. Specifically, the hollow swirl disc 600 is mounted 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 hollow swirl disc 600 seals the top opening of the axial airflow mixing section 100, and the outer side wall of the hollow swirl disc 600 abuts against the cavity side wall of the axial airflow mixing cavity 110 to realize radial limitation of the hollow swirl disc 600. The hollow swirl disk 600 is provided with a central hole 620 which is penetrated along the axial direction of the hollow swirl disk 600, and the swirl atomizer 400 extends out from bottom to top through the central hole 620. The plurality of through holes 610 are disposed around the central hole 620 and are uniformly spaced apart. The axial swirling wind reaching the top end of the axial air flow mixing section 100 may be ejected upward through the respective through holes 610. In the embodiment shown in the drawings, the through holes 610 are fan-shaped, and the circumferential dimension of the through holes 610 is gradually increased 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 a circle, an ellipse, a rectangle, etc. Since there is no shielding member at the through hole 610, the axial swirling air can smoothly circulate, and the blocking of the swirling air flow can be 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 air flow mixing section 100 includes a closed end opposite to the open end, the main body 420 passes through the closed end to extend into the axial air flow 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 one side of the hollow swirl disk 600 facing away from the axial air flow 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 be ejected through the atomizing nozzle 410. Specifically, the axial air flow mixing section 100 is provided with a mounting hole at the center of the closed end, and the main body 420 is rod-shaped, passes through the mounting hole from bottom to top, and is fixed to the closed end. Specifically, an external thread may be provided on the outer circumferential surface of the portion of the main body 420 exposed to the outside of the axial air-flow mixing section 100, and a nut may be screwed onto the external thread until the nut abuts against the outer end surface of the closed end of the axial air-flow mixing section 100, thereby fixedly mounting the main body 420 to the closed end of the axial air-flow mixing section 100. Of course, in other embodiments, the fixed mounting may be achieved by means of a snap fit 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 swirl disk 600, for example, the fixing can be realized by a screw, or the fixing can also be realized by clamping. The fuel flows through the inside of the main body 420, flows upward to flow 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 concurrent intake pipe 310 and the axial direction of the axial countercurrent intake pipe 320 are inclined with respect to the end surface of the axial airflow mixing section 100, the distance between the axial concurrent intake pipe 310 and the airflow outlet of the axial airflow mixing section 100 is gradually reduced along the airflow direction in the axial concurrent intake pipe 310, and the distance between the axial countercurrent intake pipe 320 and the airflow outlet is gradually reduced along the airflow direction in the axial countercurrent intake pipe 320. Specifically, the axial downstream air inlet pipe 310 is inclined upward along the flow direction of the air flow in the axial downstream air inlet pipe 310. The axial counterflow air inlet pipe 320 is inclined upward in the flow direction of the air flow in the axial counterflow air inlet pipe 320. By the arrangement, the axial forward flow gas and the axial reverse flow gas have upward flow speeds in the initial stage, so that the upward flow is easier. Preferably, in some embodiments, 5.ltoreq.α.ltoreq.20, where α is the angle between the axis of the axial forward flow inlet pipe 310 and the end face (i.e., horizontal) of the axial air flow mixing section 100, and also the angle between the axis of the axial reverse flow inlet pipe 320 and the end face (i.e., horizontal) of the axial air flow mixing section 100. Similarly, the tangential downstream air inlet pipe 330 is inclined upward in the flow direction of the air flow within the tangential downstream air inlet pipe 330. The tangential counterflow air inlet pipe 340 is inclined upward in the direction of flow of the air flow within the tangential counterflow air inlet pipe 340. Of course, in some embodiments, the axial forward flow intake pipe 310, the axial reverse flow intake pipe 320, the tangential forward flow intake pipe 330, and the tangential reverse flow intake pipe 340 may be all disposed horizontally.
Referring to the figure, in some embodiments, a precursor central tube 421 and an outer shear air tube 422 extending along the axial direction of the axial air flow mixing section 100 are disposed inside the swirl atomizer 400, the outlet of the precursor central tube 421 and the outlet of the outer shear air tube 422 are both communicated with the atomizing nozzle 410, the outer shear air tube 422 is sleeved outside the precursor central tube 421, and the air ejected through the atomizing nozzle 410 is wrapped outside the fuel. Specifically, the outer shear gas pipe 422 communicates with the shear gas inlet pipe 720, and the precursor center pipe 421 communicates with the precursor inlet pipe 710. The precursor inlet pipe 710 and the shear gas inlet pipe 720 extend into the axial gas flow mixing chamber 110 through the side wall of the axial gas flow mixing section 100, and are respectively connected to corresponding positions on the main body 420. Air flows into the outer shear air pipe 422 through the shear air inlet pipe 720 and into the atomizing nozzle 410. The precursor flows into the precursor center tube 421 through the precursor inlet tube 710 and into the atomizing nozzle 410. Within the atomizing nozzle 410, the precursor is air-packed and ejected at a high speed. In the spraying process, the precursor is sheared and crushed by air, so that the precursor is atomized, and the liquid precursor is crushed into liquid drops with smaller particle size, so that the precursor is easier to burn fully. Preferably, the atomizing nozzle 410 is hollow and tapered, with the radial dimension of the interior cavity decreasing from bottom to top, and fuel flows into the tapered interior cavity of the atomizing nozzle 410 via the precursor center tube 421, while air also flows into the tapered interior cavity of the atomizing nozzle 410 via the outer shear air tube 422. By defining the interior of the atomizing nozzle 410 to be tapered, the angle of air jet can be directed as much as possible toward the centrally located fuel, thereby enhancing the shearing and breaking of the liquid fuel and providing better atomization.
Referring to FIGS. 3, 8, and 9, in some embodiments, 5.ltoreq.α.ltoreq.20; h is more than or equal to 1.5d and less than or equal to 3d; d is more than or equal to 1.1D 2 ≤1.5d；1.1D 2 ≤D 1 ≤1.2D 2 ；0.5D 2 ≤H≤0.9D 2 ；0.2H≤H 1 Less than or equal to 0.6H. Wherein alpha is the axial direction and the axial direction of the axial downstream air inlet pipe 310The included angle between the end surfaces of the axial air flow mixing section 100 is also the included angle between the axial direction of the axial countercurrent air inlet pipe 320 and the end surfaces of the axial air flow mixing section 100. H 1 H is the axial length of the tangential air flow mixing section 200, which is the difference in height between the end plate 240 and the top end of the axial air flow mixing section 100. 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 (D) 1 D is the inner diameter of the tangential air flow mixing section 200 2 Is the outer diameter of the airflow dividing section 500. When the numerical range is satisfied, the burner can realize better synthesis effect, and is beneficial to the nucleation, coalescence and sintering growth process of nano oxide particles.
Referring to fig. 3 and 8, in the combustion process, the liquid fuel self-sustaining combustion flame synthesis burner of the present invention mainly has 4 gas flows and liquid flows involved in the process of synthesizing nano powder particles, and specifically includes: axial swirl wind, tangential swirl wind, precursor, shear gas. The axial cyclone wind is formed by coupling two airflows of axial reverse flow air and axial forward flow air, and the tangential cyclone wind is formed by coupling two airflows of tangential reverse flow air and tangential forward flow air, and specifically comprises the following components:
The axial cyclone wind, including the axial counter-current air, is injected by the axial counter-current air inlet pipe 320, and the axial counter-current air is injected by the axial counter-current air inlet pipe 310, and then the two air flows are injected into the interior of the axial air flow mixing section 100 at high speed along different heights and positions, because of different directions of the rotating air flows generated between the two air flows, when the incident momentum of the axial counter-current air is greater than that of the axial counter-current air, the clockwise rotation of the axial counter-current air in the axial air flow mixing section 100 takes a dominant role, and clockwise cyclone air flow is generated at the upper end of the axial air flow mixing section 100, and when the incident momentum of the axial counter-current air is smaller than that of the axial counter-current air, at this time, the anticlockwise rotation of the axial counter-current air in the axial air flow mixing section 100 takes a dominant role, and anticlockwise cyclone air flow is generated at the upper end of the axial air flow mixing section 100. In this process, when the flow ratio of the axial counter-current air flow to the axial forward-current air flow is 100%:0% to 0%: in the process of gradually increasing the air flow between 100%, the rotational flow intensity of the counterclockwise rotational air flow in the axial air flow mixing section 100 is gradually reduced, the rotational flow is gradually changed into the flow along the axial direct-current air flow, then the clockwise rotational air flow is generated, and the rotational flow intensity is gradually increased. And then the air flow having a certain swirl strength is ejected from the through hole 610 located at the upper portion.
The tangential cyclone wind, including the tangential counter-current air, is injected by the tangential counter-current air inlet pipe 340, and simultaneously, the tangential counter-current air is injected by the tangential counter-current air inlet pipe 330, and then the two air flows are injected into the tangential air flow mixing section 200 at high speed along different heights and positions, because of different directions of the rotating air flows generated between the two air flows, when the incident momentum of the tangential counter-current air is larger than the incident momentum of the tangential counter-current air, the clockwise rotation of the tangential counter-current air in the tangential air flow mixing section 200 takes the dominant role, and the clockwise cyclone air flow is generated at the upper end of the tangential air flow mixing section 200, and when the incident momentum of the tangential counter-current air is smaller than the incident momentum of the tangential counter-current air, the anticlockwise rotation of the tangential counter-current air in the tangential air mixing section 200 takes the dominant role, and the anticlockwise cyclone air flow is generated at the upper end of the tangential air flow mixing section 200. In this process, when the flow ratio of tangential countercurrent flow to tangential concurrent flow is 100%:0% to 0%: in the process of gradually increasing the air flow between 100%, the anti-clockwise rotation air flow rotational flow intensity in the tangential air flow mixing section 200 is gradually reduced, the air flow is gradually changed into the axial direct current air flow, then the clockwise rotation air flow is generated, and the rotational flow intensity is gradually increased. The tangential airflow with a certain swirl strength is then ejected from the inner outlet of the tangential airflow outlet ring 220 at a high speed.
The precursor, mainly a mixture of liquid fuel (e.g. alcohol-based liquid fuel) and precursor salt (e.g. nitrate or acetate salt), enters the precursor central tube 421 through the precursor inlet tube 710 under the action of an external booster pump, and is sprayed out from the atomizing nozzle 410.
The shear gas, mainly air flow, enters the outer layer shear gas pipe 422 through the shear gas inlet pipe 720 under the action of the external booster fan, and is sprayed out from the atomizing nozzle 410 at a high speed.
First, in contrast to conventional solutions where an on-duty flame is disposed around the atomized precursor (typically using CH 4 Or natural gas combustion to construct on-duty flame), the self-sustaining combustion of the cyclone flame synthesis burner can be realized by the structure and the air distribution design under the combustion organization mode of completely relying on self combustion heat release of atomized liquid fuel and reasonable coupling of surrounding annular cyclone air;
secondly, axial swirl wind and tangential swirl wind are sequentially arranged from inside to outside in the circumferential direction of the central atomization precursor, and an airflow separation section is arranged between the axial swirl wind and the tangential swirl wind, so that the flexible adjustment of the axial distribution and 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 realized, and the particle size, morphology and crystalline phase of synthesized nano particles are effectively controlled;
Thirdly, the axial swirl wind and the tangential swirl wind constructed in the invention can continuously and flexibly adjust the swirl direction and the swirl strength of the air flow on line by adjusting the air volume ratio between the two air flows of the forward air flow and the reverse air flow, thereby increasing flexible adjustment measures for the synthesis process of nano powder particles;
and the atomization flame synthesis burner has the advantages of simple structure, convenience in design and processing and low manufacturing cost, is beneficial to improving the powder material synthesis yield of a single atomization flame synthesis burner, and promotes the large-scale popularization and application of atomization swirl flame synthesis technology.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by 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.
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|---|---|---|---|---|
| FR2249585A5 (en) * | 1973-10-26 | 1975-05-23 | Gaz De France | High-temp. gas burner for cupolas - uses low-press. gas and permits partial replacement of coke by gas |
| US4245980A (en) * | 1978-06-19 | 1981-01-20 | John Zink Company | Burner for reduced NOx emission and control of flame spread and length |
| DE3813222A1 (en) * | 1988-04-20 | 1989-11-02 | Kleinewefers Energie Umwelt | DEVICE FOR SUPPLYING EXHAUST AIR AND / OR COMBUSTION AIR TO A BURNER OR A COMBUSTION CHAMBER |
| JP3888619B2 (en) * | 2001-12-25 | 2007-03-07 | 独立行政法人 宇宙航空研究開発機構 | Gas turbine combustor premixing device |
| EP1669747A1 (en) * | 2004-12-09 | 2006-06-14 | ETH Zürich | Formation of highly porous gas-sensing layers by deposition of nanoparticles produced by flame spray pyrolysis |
| FR2999975B1 (en) * | 2012-12-20 | 2015-02-27 | Michelin & Cie | METALLIC REINFORCEMENT READY FOR USE WHOSE SURFACE IS PROVIDED WITH METAL SULFIDE NANOPARTICLES |
| FI20146177A (en) * | 2014-12-31 | 2016-07-01 | Teknologian Tutkimuskeskus Vtt Oy | Process for the preparation of catalytic nano coating |
| CN105627317B (en) * | 2015-12-31 | 2018-07-10 | 北京理工大学 | Rapidly mixing tubulose flame burner with axial jet |
| CN105738139B (en) * | 2016-02-06 | 2018-09-04 | 中国科学院工程热物理研究所 | Burner and burn test method |
| CN107036100B (en) * | 2017-05-31 | 2019-02-22 | 北京理工大学 | A kind of axis with expansion segment cuts more cyclone gas-liquids and consolidates multiphase flow burner |
| CN107511123B (en) * | 2017-09-29 | 2023-04-14 | 清华大学 | Atomized flame nanoparticle synthesis system based on multi-cyclone reinforced mixing |
| CN109708148B (en) * | 2019-01-11 | 2021-01-29 | 东方电气集团东方汽轮机有限公司 | Gas turbine combustor doublestage radial swirler |
| CN112503524A (en) * | 2020-12-17 | 2021-03-16 | 华中科技大学 | Burner for synthesizing nano-particles by flame |
-
2022
- 2022-02-11 CN CN202210129593.6A patent/CN114459024B/en active Active
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