CN114923171A - Combustor and exhaust gas aftertreatment system - Google Patents

Combustor and exhaust gas aftertreatment system Download PDF

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Publication number
CN114923171A
CN114923171A CN202210492118.5A CN202210492118A CN114923171A CN 114923171 A CN114923171 A CN 114923171A CN 202210492118 A CN202210492118 A CN 202210492118A CN 114923171 A CN114923171 A CN 114923171A
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CN
China
Prior art keywords
pipe
combustion
mixing
tube
air
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CN202210492118.5A
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Chinese (zh)
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不公告发明人
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Chongqing Cvs Environmental Protection Technology Co ltd
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Chongqing Cvs Environmental Protection Technology Co ltd
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Priority to CN202210492118.5A priority Critical patent/CN114923171A/en
Publication of CN114923171A publication Critical patent/CN114923171A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

The invention relates to the technical field of exhaust gas post-treatment systems, in particular to a combustor and an exhaust gas post-treatment system. The burner includes: a nozzle assembly, a mixing tube, a first combustion tube, a second combustion tube, and an ignition plug; a mixing cavity is formed in the mixing pipe, one end of the mixing pipe is provided with a waste gas inlet, and the other end of the mixing pipe is provided with a gas outlet; the first combustion pipe is arranged on the mixing pipe, the second combustion pipe is arranged in the mixing cavity along the radial direction of the mixing pipe, one end of the first combustion pipe is communicated with the second combustion pipe, the other end of the first combustion pipe is provided with a nozzle assembly, and the second combustion pipe is provided with a plurality of diffusion ports; a first air inlet is formed in the first combustion pipe, and the ignition plug is arranged on the first combustion pipe. Because the second combustion tube sets up in the mixing chamber along the radial of mixing tube, can improve the combustion effect of waste gas through the radial diffusion of a plurality of diffusion mouths along the mixing tube, it is little to occupy the axial space of mixing tube simultaneously, has improved space utilization and has reduced the cost.

Description

Combustor and exhaust gas aftertreatment system
Technical Field
The invention relates to the technical field of exhaust gas post-treatment systems, in particular to a combustor and an exhaust gas post-treatment system.
Background
The existing diesel oil post-processing system combustor generally adopts a scheme of arranging a first-stage ignition tube and a second-stage combustion tube, the first-stage ignition tube is inserted into an exhaust pipeline or a shell, the second-stage main combustion tube is coaxially arranged with the exhaust pipeline, and an oil-gas mixture after combustion is guided into an exhaust flow channel from the second-stage main combustion tube.
On the one hand, because flame is mainly by the blowout of second grade main combustion pipe, flame concentrates on the center district, radial diffusion is difficult, and in order to improve the radial diffusion effect of second grade main combustion pipe blowout flame, need to get into second grade air fully rotatory mixture behind the second grade main combustion pipe, this length that just leads to second grade main combustion pipe can not be too short, need great axial space, it is great to make the whole occupation space of combustor, space utilization has been reduced and the cost is improved, on the other hand, though so set up, spun flame also receives the restriction of second grade main combustion pipe, radial diffusion effect is relatively poor, most flame directly flows into the low reaches catalyst converter from the central zone, the low reaches catalyst converter of fragile low reaches.
Disclosure of Invention
The invention aims to provide a combustor and an exhaust gas aftertreatment system, and aims to solve the technical problems that a main combustion pipe in the prior art occupies a large space, the space utilization rate is reduced, the cost is increased, and a downstream catalyst is easy to damage.
The invention provides a burner for an exhaust gas aftertreatment system, the burner comprising: a nozzle assembly, a mixing tube, a first combustion tube, a second combustion tube, and an ignition plug;
a mixing cavity is formed in the mixing pipe, a waste gas inlet is formed in one end of the mixing pipe, a gas outlet is formed in the other end of the mixing pipe, and the waste gas inlet and the gas outlet are both communicated with the mixing cavity;
the first combustion pipe is arranged on the mixing pipe, the second combustion pipe is arranged in the mixing cavity along the radial direction of the mixing pipe, one end of the first combustion pipe is communicated with the second combustion pipe, the other end of the first combustion pipe is provided with the nozzle assembly, the nozzle assembly is used for injecting fuel into the first combustion pipe, and the second combustion pipe is provided with a plurality of diffusion ports;
the first combustion pipe is provided with a first air inlet, and the ignition plug is arranged on the first combustion pipe and used for igniting fuel sprayed by the nozzle assembly.
As a further technical solution, the side wall of the second combustion tube circumferentially includes a guide region and a combustion region, the guide region faces the exhaust gas inlet for guiding the exhaust gas, and the combustion region is provided with a plurality of diffusion ports.
As a further technical scheme, the second combustion tube is in a linear shape, a Y shape or an annular shape.
As a further aspect, the first air inlet is a chamfered cut for generating a swirl flow in the first combustion pipe.
As a further technical solution, the first combustion pipe comprises an outer pipe body and an inner pipe body, the outer pipe body is sleeved on the inner pipe body, an air cavity is formed between the outer pipe body and the inner pipe body, and the nozzle assembly is used for injecting fuel to the inner pipe body;
the side wall of the outer pipe body is provided with the first air inlet, rotational flow can be generated in the air cavity, the side wall of the inner pipe body is provided with a plurality of second air inlets distributed along the circumferential direction, and the plurality of second air inlets are used for forming rotational flow in the inner pipe body.
As a further technical solution, the second air inlet is strip-shaped and is obliquely arranged.
As a further technical scheme, a first mounting port is further formed in the side wall of the outer tube body, and a second mounting port corresponding to the first mounting port is further formed in the side wall of the inner tube body;
one end of the ignition plug is fixed to the first mounting port, and the other end of the ignition plug is fixed to the second mounting port.
As a further technical solution, the nozzle assembly includes a nozzle body, an end cap and an upper cover;
the end cover is connected to the end part of the first combustion pipe, a third air inlet is formed in the side part of the end cover, and a conical through hole for forming air rotational flow is formed in the top of the end cover;
the upper cover is connected with the end cover and provided with a fuel flow passage, the inlet end of the nozzle body is connected with the upper cover and communicated with the fuel flow passage, and the nozzle end is embedded in the conical through hole.
As a further technical solution, the fuel injection device further comprises a conical diffuser, wherein the conical diffuser is arranged in the mixing pipe and is positioned between the second combustion pipe and the air outlet.
The invention provides an exhaust gas aftertreatment system which comprises the combustor.
Compared with the prior art, the combustor and the exhaust gas aftertreatment system provided by the invention have the technical advantages that:
the invention provides a burner for an exhaust gas aftertreatment system, the burner comprising: a nozzle assembly, a mixing tube, a first combustion tube, a second combustion tube, and an ignition plug; a mixing cavity is formed in the mixing pipe, a waste gas inlet is formed at one end of the mixing pipe, a gas outlet is formed at the other end of the mixing pipe, and the waste gas inlet and the gas outlet are both communicated with the mixing cavity; the first combustion pipe is arranged on the mixing pipe, the second combustion pipe is arranged in the mixing cavity along the radial direction of the mixing pipe, one end of the first combustion pipe is communicated with the second combustion pipe, the other end of the first combustion pipe is provided with a nozzle assembly, the nozzle assembly is used for injecting fuel into the first combustion pipe, and the second combustion pipe is provided with a plurality of diffusion ports; a first air inlet is formed in the first combustion pipe, and the ignition plug is arranged on the first combustion pipe and used for igniting fuel sprayed by the nozzle assembly.
The nozzle assembly spouts fuel into first combustion tube, first air inlet is with leading-in first combustion tube of air, fuel and air mix in first combustion tube and form the gas mixture, and ignite through the ignition plug and form the one-level burning, because the second combustion tube radially sets up in the hybrid chamber along the hybrid tube, the gas mixture that makes the burning can pass through the radial diffusion of a plurality of diffusion mouths along the hybrid tube after getting into the second combustion tube, and form the second grade burning with the waste gas that the waste gas import got into, the flame of burning is effectual and evenly distributed along the radial diffusion of hybrid tube, improve the life of low reaches catalyst converter, and the combustion effect of waste gas can effectively be improved in the second grade burning, the axial space that the hybrid tube was occupied to the second combustion tube is little simultaneously, make the combustor whole can be littleer, space utilization is improved and the cost is reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a burner according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of another perspective of a burner provided in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a combustor provided by an embodiment of the present invention;
FIG. 4 is a top view of an open upper cover of a burner according to an embodiment of the present invention;
FIG. 5 is a top view of an open end cover of a combustor provided by an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second combustion pipe according to an embodiment of the present invention.
An icon: 1-a mixing tube; 2-a first combustion tube; 3-a second combustion tube; 4-an ignition plug; 5-a waste gas inlet; 6-air outlet; 7-a diffusion port; 8-a first air inlet; 9-a guiding zone; 10-a combustion zone; 11-an outer body; 12-an inner tube; 13-an air cavity; 14-a second air inlet; 15-a nozzle body; 16-an end cap; 17-upper cover; 18-a third air inlet; 19-a tapered through hole; 20-a conical diffuser; 21-connecting a flange plate; 22-a first air duct; 23-a second air duct; 24-fuel piping.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention is described in further detail below by means of specific embodiments and with reference to the attached drawings.
The specific structure is shown in fig. 1 to 6.
The present embodiments provide a burner for an exhaust aftertreatment system, the burner comprising: a nozzle assembly, a mixing tube 1, a first combustion tube 2, a second combustion tube 3 and an ignition plug 4;
a mixing cavity is formed in the mixing pipe 1, a waste gas inlet 5 is formed in one end of the mixing pipe 1, a gas outlet 6 is formed in the other end of the mixing pipe 1, and the waste gas inlet 5 and the gas outlet 6 are both communicated with the mixing cavity;
the first combustion pipe 2 is arranged on the mixing pipe 1, the second combustion pipe 3 is arranged in the mixing cavity along the radial direction of the mixing pipe 1, one end of the first combustion pipe 2 is communicated with the second combustion pipe 3, the other end of the first combustion pipe is provided with a nozzle assembly, the nozzle assembly is used for injecting fuel into the first combustion pipe 2, and the second combustion pipe 3 is provided with a plurality of diffusion ports 7;
the first combustion pipe 2 is provided with a first air inlet 8, and the ignition plug 4 is arranged on the first combustion pipe 2 and used for igniting fuel sprayed by the nozzle assembly.
In this embodiment, the one end mouth of pipe of hybrid tube 1 is waste gas import 5, and the other end mouth of pipe is gas outlet 6, and the both ends of hybrid tube 1 all are provided with and are used for connecting fixed connection flange dish 21. Wherein, the waste gas of diesel oil burning is mainly handled to waste gas aftertreatment system, diesel oil waste gas gets into by mixing tube 1's waste gas import 5, get into low reaches part by mixing tube 1's 6 discharges of gas outlet after the burning in the mixing chamber, the mounting hole has been seted up on mixing tube 1's the lateral wall, second combustion tube 3 is along mixing tube 1's radial setting in the mixing chamber, and first combustion tube 2's one end is passed through the mounting hole and is connected with second combustion tube 3, and fixed with mixing tube 1, the nozzle assembly is installed to the other end, offer the first air inlet 8 that is used for leading-in air in to first combustion tube 2 on first combustion tube 2's the lateral wall, a plurality of diffusion mouths 7 have been seted up on second combustion tube 3's the lateral wall, for the radial diffusion effect of flame along mixing tube 1 of improvement burning, a plurality of diffusion mouths 7 are along mixing tube 1's radial distribution on second combustion tube 3.
Wherein the nozzle component sprays fuel into the first combustion pipe 2, the first air inlet 8 guides air into the first combustion pipe 2, the fuel and the air are mixed in the first combustion pipe 2 to form mixed gas and are ignited by the ignition plug 4 to form primary combustion, because the second combustion pipe 3 is arranged in the mixing cavity along the radial direction of the mixing pipe 1, the combusted gas mixture can be diffused along the radial direction of the mixing pipe 1 through the plurality of diffusion openings 7 after entering the second combustion pipe 3, and forms a secondary combustion with the waste gas entering from the waste gas inlet 5, the burning flame has good radial diffusion effect and is uniformly distributed along the mixing pipe 1, the service life of the downstream catalyst is prolonged, the secondary combustion can effectively improve the burning effect of the waste gas, meanwhile, the second combustion pipe 3 occupies a small axial space of the mixing pipe 1, so that the whole combustor can be smaller, the space utilization rate is improved, and the cost is reduced.
In this embodiment, the combustion tube includes an inner tube and an outer tube, and the inner tube is formed with the mixing chamber, and the outer tube is established on the inner tube and is provided with the interval between them for improve thermal-insulated effect.
In an optional technical solution of this embodiment, the sidewall of the second combustion tube 3 circumferentially includes a guiding region 9 and a combustion region 10, the guiding region 9 faces the exhaust gas inlet 5 for guiding the exhaust gas, and the combustion region 10 is provided with a plurality of diffusion ports 7.
In this embodiment, the side wall of the second combustion pipe 3 is divided into two parts along the circumferential direction, which are respectively a guide area 9 and a combustion area 10, the guide area 9 faces the exhaust gas inlet 5, that is, is opposite to the exhaust gas inlet 5, the guide area 9 guides the contacted incoming flow exhaust gas to the two sides of the guide area 9, so that the exhaust gas flows towards the gas outlet 6, thereby preventing the exhaust gas from entering the second combustion pipe 3 and affecting the combustion, the combustion area 10 is provided with a plurality of diffusion ports 7, not only the mixed gas combusted by radial diffusion to the mixing pipe 1, but also the mixed gas combusted by diffusion to the gas outlet 6, and the mixed gas is combusted with the incoming flow exhaust gas.
In an alternative embodiment of the present embodiment, the second combustion tube 3 is linear, Y-shaped or annular.
In the embodiment, when the second combustion pipe 3 is linear, one end of the second combustion pipe 3 is communicated with the first combustion pipe 2, and the other end of the second combustion pipe 3 is abutted against the inner wall of the mixing pipe 1 or provided with a gap, so that the structure is simple, and the radial diffusion effect along the mixing pipe 1 is better; when the second combustion tube 3 is Y-shaped, one end of the second combustion tube is communicated with the first combustion tube 2, the other two ends of the second combustion tube are abutted to the inner wall of the mixing tube 1 or provided with gaps, and the two outer ends of the second combustion tube form a certain angle along the circumferential direction of the mixing tube 1, so that the radial diffusion effect along the mixing tube 1 can be further improved, preferably, the interval between any two adjacent ends of the Y-shaped second combustion tube 3 is equal along the circumferential direction of the mixing tube 1, the manufacturing is convenient, and the radial diffusion along the mixing tube 1 is uniform; furthermore, the second combustion tube 3 may also be provided with a plurality of branch ends on the basis of a Y shape, and the intervals between any two branch ends are equal along the circumferential direction of the mixing tube 1, so that the radial diffusion uniformity along the mixing tube 1 can be further improved; when the second combustion tube 3 is annular, set up the through-hole of being connected with first combustion tube 2 on the second combustion tube 3, the second combustion tube 3 of loop configuration can be to the intra-annular diffusion burning's gas mixture, also can be to the ring outer diffusion burning's gas mixture, and both radial diffusion to mixing tube 1 is even, also can guarantee the combustion effect of mixing tube 1 axial central zone.
In an alternative embodiment of the present embodiment, the first air inlet 8 is a chamfered cut for generating a swirling flow in the first combustion pipe 2.
In this embodiment, still include first air duct 22, the one end of first air duct 22 is the inclined plane end, the inclined plane end is with first air inlet 8 accordant connection, wherein the inclined cut runs through the lateral wall of first combustion tube 2 with inclination promptly, make the air current that gets into first air inlet 8 be the tangential and get into in first combustion tube 2, first air duct 22 is behind the leading-in first air inlet 8 of air, because first air inlet 8 is the inclined cut, can form the whirl after getting into in first combustion tube 2, can be more abundant with the fuel mixture that nozzle assembly sprays, improve the combustion effect.
In an optional technical solution of this embodiment, the first combustion pipe 2 includes an outer pipe body 11 and an inner pipe body 12, the outer pipe body 11 is sleeved on the inner pipe body 12, an air cavity 13 is formed between the outer pipe body and the inner pipe body 12, and the nozzle assembly is used for injecting fuel to the inner pipe body 12;
the side wall of the outer tube body 11 is provided with a first air inlet 8 which can generate rotational flow in the air cavity 13, the side wall of the inner tube body 12 is provided with a plurality of second air inlets 14 which are distributed along the circumferential direction, and the plurality of second air inlets 14 are used for forming rotational flow in the inner tube body 12.
In this embodiment, the outer tube 11 is sleeved outside the inner tube 12, and a space is provided between the outer tube 11 and the inner tube 12, that is, the inner diameter of the outer tube 11 is larger than the outer diameter of the inner tube 12, one end of the outer tube 11 and one end of the inner tube 12 are connected with a nozzle assembly, the other end of the outer tube 11 and the other end of the inner tube 12 are connected with an annular baffle, and the outer tube 11 and the inner tube 12 form a closed air cavity 13 through the nozzle assembly and the baffle.
In this embodiment, the second air inlet 14 may be a circular hole, a square hole, a triangular hole, or the like, when air enters the air cavity 13 from the first air inlet 8, a rotational flow flowing around the outer wall of the inner tube 12 is formed in the air cavity 13, and after entering the second air inlet 14 from the air cavity 13, a rotational flow can be formed in the inner tube 12, so that the fuel sprayed into the inner tube 12 by the nozzle assembly is fully mixed; the second air inlet 14 may also be a chamfered opening, i.e. penetrating the sidewall of the inner tube 12 at an inclined angle, so that the swirling effect of the swirling air in the air chamber 13 entering the inner tube 12 through the second air inlet 14 is enhanced, further improving the mixing effect.
Preferably, the second air inlet 14 is in a strip shape and is disposed obliquely. Wherein the second air inlet 14 extends along the axial direction of the inner tube 12 to form a strip shape, and the second air inlet 14 is inclined relative to the axis of the inner tube 12, so that the air inflow of the second air inlet 14 is increased, and the air entering through the second air inlet 14 can further improve the swirling effect.
In an optional technical solution of this embodiment, a first mounting port is further formed on a sidewall of the outer tube 11, and a second mounting port corresponding to the first mounting port is further formed on a sidewall of the inner tube 12; one end of the ignition plug 4 is fixed to the first mounting port, and the other end is fixed to the second mounting port. The front end of the ignition plug 4 extends into the inner pipe body 12 and is used for igniting fuel in the inner pipe body 12, the rear end of the ignition plug extends out of the first mounting port and is connected with external parts, the structure is simple, the fixing is stable, meanwhile, rotational flow in the air cavity 13 is not influenced, the air cavity 13 is kept closed, and air can only enter the inner pipe body 12 through the second air inlet 14.
In an optional technical solution of this embodiment, the nozzle assembly includes a nozzle body 15, an end cover 16 and an upper cover 17;
the end cover 16 is connected to the end part of the first combustion pipe 2, the side part of the end cover 16 is provided with a third air inlet 18, and the top part of the end cover 16 is provided with a conical through hole 19 for forming air rotational flow;
the upper cover 17 is connected to the end cover 16 and is provided with a fuel flow passage, the inlet end of the nozzle body 15 is connected to the upper cover 17 and is communicated with the fuel flow passage, and the nozzle end is embedded in the tapered through hole 19.
In this embodiment, the end cover 16 is connected to one end of the first combustion pipe 2 far away from the second combustion pipe 3, a tapered through hole 19 is formed in the middle of the end surface of the end cover 16 far away from the first combustion pipe 2, the tapered through hole 19 is in an inverted cone shape and is communicated with the first combustion pipe 2, and the end cover 16 and the annular baffle plate seal the air cavity 13 between the two ends of the outer pipe body 11 and the inner pipe body 12; the side wall of the end cover 16 is provided with a third air inlet 18, the third air inlet 18 is connected with a second air pipeline 23, the nozzle body 15 comprises an inlet end and a nozzle end, the inlet end is connected with the upper cover 17, one end of a fuel flow passage in the upper cover 17 is communicated with the inlet end, the other end of the fuel flow passage is communicated with a fuel pipeline 24, and the nozzle end is embedded in the tapered through hole 19 and is positioned on the axis of the tapered through hole 19.
After the second air pipeline 23 conveys air into the tapered through hole 19 through the third air inlet 18, air tangentially enters the tapered through hole 19, airflow surrounds the nozzle body 15 to form a rotational flow, the nozzle end is wrapped by the rotational flow, and fuel staying at the periphery of the nozzle end is timely and fully brought into the first combustion pipe 2, so that the nozzle is prevented from being plugged by coking of the fuel at the nozzle end, maintenance cost is reduced, and meanwhile, due to the arrangement of the upper cover 17 and the end cover 16, manufacturing, disassembly and maintenance are facilitated, and cost is reduced.
Preferably, in this embodiment, the first air duct 22 is communicated with the second air duct 23, so as to be conveniently connected with an air source, and the air conditioner has a simple structure and saves space.
In an optional technical solution of this embodiment, the burner further includes a conical diffuser 20, and the conical diffuser 20 is disposed in the mixing pipe 1 and located between the second combustion pipe 3 and the air outlet 6. In this way, the air flow generated by the combustion of the mixture gas and the waste gas diffused out of the second combustion pipe 3 through the diffusion opening 7 is diffused to the downstream through the conical diffuser 20 in a rotating manner, so that the combustion is uniform for the subsequent treatment.
Specifically, the conical diffuser 20 can be a baffle cone, and has a simple structure and a good diffusion effect; preferably, the conical diffuser 20 comprises a conical body and a plurality of vanes connected to the conical body in the circumferential direction of the conical body, and the plurality of vanes are inclined or oriented in the same direction so as to produce a swirling effect by the vanes in the same rotational direction.
The exhaust gas after-treatment system provided by the embodiment comprises the combustor, and therefore the technical advantages and effects achieved by the exhaust gas after-treatment system comprise the technical advantages and effects achieved by the combustor, and are not repeated herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A burner for an exhaust gas after-treatment system, the burner comprising: the burner comprises a nozzle assembly, a mixing pipe (1), a first combustion pipe (2), a second combustion pipe (3) and an ignition plug (4);
a mixing cavity is formed in the mixing pipe (1), a waste gas inlet (5) is formed in one end of the mixing pipe (1), a gas outlet (6) is formed in the other end of the mixing pipe, and the waste gas inlet (5) and the gas outlet (6) are both communicated with the mixing cavity;
the first combustion pipe (2) is arranged on the mixing pipe (1), the second combustion pipe (3) is arranged in the mixing cavity along the radial direction of the mixing pipe (1), one end of the first combustion pipe (2) is communicated with the second combustion pipe (3), the other end of the first combustion pipe is provided with the nozzle assembly, the nozzle assembly is used for injecting fuel into the first combustion pipe (2), and the second combustion pipe (3) is provided with a plurality of diffusion ports (7);
a first air inlet (8) is formed in the first combustion pipe (2), and the ignition plug (4) is arranged on the first combustion pipe (2) and used for igniting fuel sprayed by the nozzle assembly.
2. A burner according to claim 1, wherein the side wall of the second burner tube (3) comprises circumferentially a guiding zone (9) and a combustion zone (10), the guiding zone (9) facing the flue gas inlet (5) for guiding the flue gas, the combustion zone (10) being provided with a plurality of said diffusion openings (7).
3. Burner according to claim 1, wherein said second burner tube (3) is linear, Y-shaped or annular.
4. A burner according to claim 1, wherein the first air inlet (8) is chamfered for creating a swirling flow in the first combustion tube (2).
5. A burner according to claim 4, characterized in that said first combustion pipe (2) comprises an outer body (11) and an inner body (12), said outer body (11) being sleeved to said inner body (12) with an air cavity (13) formed therebetween, said nozzle assembly being adapted to inject fuel into said inner body (12);
the side wall of the outer pipe body (11) is provided with the first air inlet (8) and can generate rotational flow in the air cavity (13), the side wall of the inner pipe body (12) is provided with a plurality of second air inlets (14) distributed along the circumferential direction, and the plurality of second air inlets (14) are used for forming rotational flow in the inner pipe body (12).
6. Burner according to claim 5, wherein said second air inlet (14) is strip-shaped and is arranged obliquely.
7. The burner according to claim 5, wherein the outer tube (11) further has a first mounting opening formed in a sidewall thereof, and the inner tube (12) further has a second mounting opening formed in a sidewall thereof corresponding to the first mounting opening;
one end of the ignition plug (4) is fixed to the first mounting port, and the other end of the ignition plug is fixed to the second mounting port.
8. A burner according to any one of claims 1 to 7, characterized in that said nozzle assembly comprises a nozzle body (15), an end cover (16) and an upper cover (17);
the end cover (16) is connected to the end part of the first combustion pipe (2), a third air inlet (18) is formed in the side part of the end cover (16), and a conical through hole (19) for forming air rotational flow is formed in the top of the end cover;
the upper cover (17) is connected with the end cover (16) and provided with a fuel flow passage, the inlet end of the nozzle body (15) is connected with the upper cover (17) and communicated with the fuel flow passage, and the nozzle end is embedded in the conical through hole (19).
9. Burner according to any one of claims 1 to 7, further comprising a conical diffuser (20), said conical diffuser (20) being arranged inside said mixing duct (1) and between said second combustion duct (3) and said air outlet (6).
10. An exhaust gas after-treatment system comprising a burner as claimed in any one of claims 1 to 9.
CN202210492118.5A 2022-05-07 2022-05-07 Combustor and exhaust gas aftertreatment system Pending CN114923171A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101398186A (en) * 2008-10-24 2009-04-01 北京大学 Self-absorption rotational flow pneumatic atomization nozzle device
JP2014047686A (en) * 2012-08-30 2014-03-17 Ihi Corp Burner device
CN106090907A (en) * 2016-06-12 2016-11-09 北京航空航天大学 The strong swirl flame diffusion burner of a kind of premix
CN211316160U (en) * 2019-11-07 2020-08-21 重庆凯瑞伟柯斯环保科技有限公司 Burner assembly
CN112815318A (en) * 2021-03-09 2021-05-18 重庆超力高科技股份有限公司 Burner turbulent flow component and DPF active regeneration mechanism
CN214619514U (en) * 2021-03-09 2021-11-05 重庆超力高科技股份有限公司 DPF active regeneration system shell and DPF active regeneration system
CN215521019U (en) * 2021-04-07 2022-01-14 重庆凯瑞伟柯斯环保科技有限公司 Pipeline combustor
CN216308669U (en) * 2021-10-29 2022-04-15 中国电建集团都江电力设备有限公司 Gas-gas mixed heat exchanger capable of being mixed uniformly and rapidly

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101398186A (en) * 2008-10-24 2009-04-01 北京大学 Self-absorption rotational flow pneumatic atomization nozzle device
JP2014047686A (en) * 2012-08-30 2014-03-17 Ihi Corp Burner device
CN106090907A (en) * 2016-06-12 2016-11-09 北京航空航天大学 The strong swirl flame diffusion burner of a kind of premix
CN211316160U (en) * 2019-11-07 2020-08-21 重庆凯瑞伟柯斯环保科技有限公司 Burner assembly
CN112815318A (en) * 2021-03-09 2021-05-18 重庆超力高科技股份有限公司 Burner turbulent flow component and DPF active regeneration mechanism
CN214619514U (en) * 2021-03-09 2021-11-05 重庆超力高科技股份有限公司 DPF active regeneration system shell and DPF active regeneration system
CN215521019U (en) * 2021-04-07 2022-01-14 重庆凯瑞伟柯斯环保科技有限公司 Pipeline combustor
CN216308669U (en) * 2021-10-29 2022-04-15 中国电建集团都江电力设备有限公司 Gas-gas mixed heat exchanger capable of being mixed uniformly and rapidly

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