CN114165782B - Combined device for realizing low-nitrogen short-flame combustion of diesel burner and control method - Google Patents

Combined device for realizing low-nitrogen short-flame combustion of diesel burner and control method Download PDF

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Publication number
CN114165782B
CN114165782B CN202111530508.9A CN202111530508A CN114165782B CN 114165782 B CN114165782 B CN 114165782B CN 202111530508 A CN202111530508 A CN 202111530508A CN 114165782 B CN114165782 B CN 114165782B
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flame
combustion
double
barrel
swirl
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CN114165782A (en
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绳以健
刘赫
刘雪强
刘毅
沈灿铎
王刚
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Institute of Quartermaster Engineering Technology Institute of Systems Engineering Academy of Military Sciences
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Institute of Quartermaster Engineering Technology Institute of Systems Engineering Academy of Military Sciences
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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
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • 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
    • 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
    • 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
    • F23D11/402—Mixing chambers downstream of the nozzle
    • 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
    • F23D11/406—Flame stabilising means, e.g. flame holders
    • 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
    • F23D11/42—Starting 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The application relates to the field of burners, in particular to a combined device for realizing low-nitrogen short-flame combustion of a diesel burner and a control method. The composite set includes adjusting device, a combustion barrel, a terminal barrel, a double-cyclone flame stabilizing disc, a nozzle and an ignition assembly, wherein the terminal barrel is fixed at the front end of the combustion barrel, the double-cyclone flame stabilizing disc is fixed inside the front end of the combustion barrel, the adjusting device is installed inside the middle section of the combustion barrel, the nozzle is fixed inside the middle section of the combustion barrel, and the adjusting device, the combustion barrel, the terminal barrel, the double-cyclone flame stabilizing disc and the nozzle are all coaxial. This application changes the burning air distribution proportion, strengthens the air feed direction and draws and penetrate the flue gas recirculation burning, under the prerequisite of guaranteeing flame stability, increases whirl air distribution intensity, and the turbulent disorder degree of oil mist flame is strengthened, and flame length shortens, strengthens the air disturbance, strengthens oil-gas mixing effect, restraines NOxGenerating; the gathering effect of air on the flame is strengthened, and the length of the flame is shortened; injecting high-temperature flue gas backflow to participate in secondary combustion and reduce NOxAnd (4) discharging.

Description

Combined device for realizing low-nitrogen short-flame combustion of diesel burner and control method
Technical Field
The application relates to the field of horizontal electric control diesel burners with forced air supply, in particular to a combined device and a control method for realizing low-nitrogen short-flame combustion of a diesel burner.
Background
At present, the horizontal automatically controlled diesel burner that uses in the market mainly uses for being equipped with the boiler design, when joining in marriage the small-size indirect heating equipment of dress, has the flame suitability problem, mainly has following several aspects:
at present, small-sized heat exchange equipment tends to be compact in structure, the space of a combustion chamber of the small-sized heat exchange equipment is relatively small, a horizontal electric control diesel burner adopting pressure cyclone diffusion combustion is long in flame length, and the problems that flame is deflected in the combustion chamber of the heat exchange equipment, heating is uneven, adaptability is poor and the like are caused.
Secondly, for a combustor adopting a pressure rotational flow diffusion type combustion mode, the flame temperature area distribution is uneven, the combustion range of fuel oil particles is short, and the fuel oil particles cannot be uniformly and sufficiently combusted, so that a large amount of NO is generatedxIs discharged into the atmosphere along with the flue gas.
Therefore, there is a need for a tissue combustion device that shortens the flame length of such burners, enhances combustion performance, and reduces NO in flue gasxAnd (5) discharging.
In view of this, the present application is specifically made.
Disclosure of Invention
The primary object of the present application is to provide a combined device for low nitrogen short flame combustion of diesel burners.
The second invention of the application aims at providing a control method for realizing low-nitrogen short-flame combustion of a diesel combustor.
In order to achieve the purpose of the invention of the application, the technical scheme is as follows:
the application provides a combined device for realizing low-nitrogen short-flame combustion of a diesel burner, which comprises an adjusting device, a combustion cylinder, a tail end cylinder, a double-cyclone flame stabilizing disc, a nozzle and an ignition assembly;
the combustion cylinder is provided with a closing-up structure, a double-cyclone flame stabilizing disc mounting groove and a tail end cylinder mounting threaded hole in sequence from the end surface along the axial direction;
the number of the double-cyclone flame stabilizing disc mounting grooves is 3, the double-cyclone flame stabilizing disc mounting grooves are circumferentially and uniformly arranged on the wall of the combustion barrel, 2 of the double-cyclone flame stabilizing disc mounting grooves are closed grooves, the other 1 of the double-cyclone flame stabilizing disc mounting grooves is a flame stabilizing disc U-shaped groove with an opening at the front end, and a limiting threaded hole is formed in the middle of the flame stabilizing disc U-shaped groove;
the diameter of the outer edge of the double-cyclone flame stabilizing disc is smaller than that of the closed end of the combustion cylinder;
at least 2 backflow holes are uniformly arranged on the wall of the tail end barrel in the circumferential direction, 3 axial tail end barrel U-shaped grooves are formed in one end of the tail end barrel, and the tail end barrel U-shaped grooves are not communicated with the backflow holes;
the adjusting device comprises an adjusting cylinder and an adjusting rod;
the double-rotational-flow flame stabilizing disc is of a conical stepped structure and comprises a conical first folded edge, a chassis and a second folded edge, wherein the inner circle of the first folded edge is connected with the outer circle of the chassis, at least 3 radial outer rotational flow grooves which are uniformly distributed on the first folded edge in the circumferential direction are formed in the first folded edge, the outer circle of the second folded edge is connected with the inner circle of the chassis, at least 3 inner rotational flow grooves formed by special-shaped shutters are uniformly distributed in the circumferential direction in the middle of the chassis, the protruding parts of the inner rotational flow grooves face the inner side of a cone, the opening areas of the inner rotational flow grooves are changed from large to small from the outer circle to the inner circle of the chassis, the rotational directions of the inner rotational flow grooves are the same as the rotational directions of the outer rotational flow grooves, and 3 mounting support legs are uniformly distributed on the outer circle of the first folded edge;
the opening end face of a boss of the inner swirl groove is P1, the plane defined by the central line of the opening end face of the boss and the central axis of the double-swirl flame stabilizing disc is P2, the included angle between P1 and P2 is 40-60 degrees, and the included angle between the upper surface of the boss and the chassis is 25-35 degrees;
the inner rotary chute and the outer rotary chute are both secondary air channels, and a central channel formed by the chassis and the second folded edge is a primary air channel;
the double-swirl flame stabilizing disc is fixed in a double-swirl flame stabilizing disc mounting hole of the combustion cylinder through mounting support legs on an excircle of a first folded edge, an outer conical surface faces the combustion cylinder, the double-swirl flame stabilizing disc mounting support legs are axially propped against in a limiting threaded hole through screws to form axial limiting, and a tertiary air channel is formed between the first folded edge outer conical surface and the combustion cylinder;
the tail end barrel U-shaped groove and a tail end barrel mounting threaded hole of the combustion barrel are fixedly connected through a screw, and the overlapping area of the tail end barrel backflow hole and the combustion barrel is changed by adjusting the axial relative position of the tail end barrel U-shaped groove and the tail end barrel mounting threaded hole;
the adjusting device is arranged in the middle section of the combustion cylinder, the end face of an adjusting cylinder of the adjusting device is arranged in the tertiary air channel, and the relative position of the end face of the adjusting cylinder and the first folding edge of the double-cyclone flame stabilizing disc is adjusted through an adjusting rod to control the sectional area of the tertiary air channel;
the nozzle is fixed in the middle section of the combustion cylinder, and the oil injection end of the nozzle is away from the double-swirl flame stabilizing disc by a certain distance;
the adjusting device, the combustion cylinder, the tail end cylinder, the double-cyclone flame stabilizing disc and the nozzle are all coaxial when assembled.
The application also relates to a control method for realizing low-nitrogen short-flame combustion of the diesel burner by adopting the combined device, which at least comprises the following steps:
s1, the primary air has the effect of enhancing uniform atomization of fuel oil and avoiding local oil accumulation and combustion, the secondary air has the effect of enhancing oil-gas mixing in a combustion area and ensuring full combustion of the fuel oil and changing the flame form, and the tertiary air has the effect of enhancing high-temperature flue gas disturbance, promoting combustion and changing the flame form; the adjusting device is used for changing the sectional area of the tertiary air channel, and under the condition that the air supply volume in the combustion cylinder is constant, the change of the sectional area of the tertiary air channel changes the primary air volume, the secondary air volume and the tertiary air volume, so that the flame combustion form is changed;
s2, the front end closing structure of the combustion cylinder, the inner swirl groove on the double-swirl flame stabilizing disc and the conical chassis are used for gathering tertiary air and secondary air in the inner swirl groove to the center of the combined device, so that the fire gathering performance is enhanced, and flame is shortened;
s3, through the double-swirl structure of the inner swirl groove and the outer swirl groove, the secondary air can increase swirl air distribution strength on the premise of ensuring that flame is not blown out, the turbulence degree of oil mist flame is enhanced, the flame length is shortened, meanwhile, diesel atomization and air are fully mixed and combusted, the local combustion temperature of flame is prevented from being too high, and NO is reducedxGenerating;
s4, forming a straight-flow airflow at the front end of the combustion cylinder at the closing opening by using the tertiary air channelA high-speed low-pressure area, which makes part of high-temperature flue gas generated by combustion flow back to the root of flame through the backflow hole of the end cylinder under the action of negative pressure gradient and participate in combustion again, thereby reducing NOxDischarging of (3);
s5, when the adjusting device is adjusted, the relative position of the tail end barrel U-shaped groove on the tail end barrel and the tail end barrel mounting threaded hole on the combustion barrel is adjusted according to the flame form, the size of the air inlet of the backflow hole on the barrel wall of the tail end barrel is changed, and therefore the high-temperature smoke backflow amount is controlled, and NO is enabled to bexAnd the emission is minimum.
The application has at least the following beneficial effects:
the combined device changes the proportion of the primary air, the secondary air and the tertiary air through the double-cyclone flame stabilizing disc and the adjusting device, and changes the combustion form of the flame through the comprehensive application of the double-cyclone flame stabilizing disc and the combustion cylinder to the primary air and the secondary air guiding fire gathering, thereby achieving the purpose of shortening the flame.
Simultaneously, this application is on the one hand through the two whirl air distribution of interior outer swirl groove on the stable flame dish of two whirl, under the prerequisite of guaranteeing flame stabilization, strengthens the air disturbance, strengthens the mixing of diesel oil atomizing and air, makes the burning more even abundant, prevents local high temperature from producing, restraines NOxGenerating; on the other hand, the flue gas backflow is formed through the pressure difference, the high-temperature flue gas recirculation combustion is realized, and the NO is reducedxIs discharged.
Drawings
FIG. 1 is a schematic structural diagram of a low-nitrogen short-flame combustion assembly according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a combustion can according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a tip cartridge according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a dual-swirl flame stabilizing disk according to a specific embodiment in an example of the present application;
FIG. 5 is a sectional view A-A of the dual cyclone flame stabilizing disc of FIG. 4;
FIG. 6 is a partial view of the dual swirl flame stabilizing disk of FIG. 5 in the direction B;
FIG. 7 is a C-C sectional view of the dual cyclone flame stabilizing disc of FIG. 4; wherein:
1-a regulating device;
11-a conditioning cylinder;
12-adjusting the rod;
2-a combustion cylinder;
21-closing up;
22-a double-swirl flame stabilizing disc mounting groove;
221-a closed groove;
222-flame stabilizing disc U-shaped groove;
223-limit threaded holes;
23-installing a threaded hole in the tail end cylinder;
3-a terminal barrel;
31-a return orifice;
32-end barrel U-shaped groove;
4-double swirl flame stabilizing disc;
41-first folding edge;
411-outer swirl groove;
42-a chassis;
421-inner cyclone groove;
4211-boss;
43-second hem;
44-mounting feet;
45-primary air channel;
46-tertiary air channel;
5-a nozzle;
6-ignition assembly.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment of the application provides a combination device for realizing low-nitrogen short-flame combustion of a diesel combustor, the structural schematic diagram of which is shown in fig. 1 and mainly comprises an adjusting device 1, a combustion cylinder 2, a tail end cylinder 3, a double-cyclone flame stabilizing disc 4, a nozzle 5 and an ignition assembly 6. The tail end barrel 3 is fixed at the front end of the combustion barrel 2, the double-cyclone flame stabilizing disc 4 is fixed in the front end of the combustion barrel 2, the outer conical surface faces the interior of the combustion barrel 2, the adjusting device 1 is installed in the middle section of the combustion barrel 2, and the nozzle 5 is fixed in the middle section of the combustion barrel 2; the adjusting device 1, the combustion cylinder 2, the tail end cylinder 3, the double-swirl flame stabilizing disc 4 and the nozzle 5 are all coaxial when assembled;
the outer conical surface of the first folded edge 41 of the double-swirl flame stabilizing disc 4 and the combustion cylinder 2 form a tertiary air channel 3; one end face of the adjusting device 1 is arranged in the tertiary air channel 3, and the sectional area of the tertiary air channel 3 can be controlled; the oil spraying end of the nozzle 5 is a certain distance away from the double-cyclone flame stabilizing disc 4, and the distance can be adjusted and is generally 3-5 mm; the ignition assembly 6 needle point is a certain distance away from the outlet of the nozzle 5, and the distance is adjustable and is generally 2-3 mm.
In the combined device of the embodiment of the application, as shown in fig. 1 in particular, the adjusting device 1 includes an adjusting cylinder 11 and an adjusting rod 12, the adjusting rod 12 is disposed on one side of the adjusting cylinder 11 far away from the swirling flow flame stabilizing disk 4, and the adjusting cylinder 11 can be adjusted by the adjusting rod 12 to perform axial movement; the diameter of the outer edge of the double-swirl flame stabilizing disc 4 is smaller than that of the closed end of the combustion cylinder 2.
In the combined device of the embodiment of the present application, as shown in fig. 2 in particular, the combustion cylinder 2 is provided with a closing-in 21 structure, a double-swirl flame-stabilizing disk mounting groove 22 and a terminal cylinder mounting threaded hole 23 in sequence from the end surface along the axial direction. There are 3 double-swirl flame stabilizing disc mounting grooves 22, and the circumference evenly sets up on the combustion barrel section of thick bamboo wall, and 2 of them are closed groove 221, and 1 is the flame stabilizing disc U type groove 222 of front end open-ended in addition, and flame stabilizing disc U type groove 222 middle part is equipped with spacing screw hole 223.
In the combination device of the embodiment of the present application, as shown in fig. 3 in particular, at least 2 backflow holes 31 are uniformly arranged on the circumferential direction of the wall of the end barrel 3, 3 axial end barrel U-shaped grooves 32 are arranged at one end of the end barrel, and the end barrel U-shaped grooves 32 are not communicated with the backflow holes 31.
In the combined device of the embodiment of the present application, as shown in fig. 4 to 7, the double-swirl flame stabilization disk 4 has a tapered stepped structure and is composed of a tapered first folded edge 41, a base plate 42 and a second folded edge 43. The inner circle of the first folded edge 41 is connected with the outer circle of the base plate 42, the first folded edge 41 is provided with radial outer swirl grooves 411 which are uniformly distributed on the circumference, at least 3 outer swirl grooves 411 are arranged, and 8-12 outer swirl grooves 411 are further preferred, and the outer circle of the first folded edge 41 is uniformly distributed with 3 mounting support legs 44 on the circumference for mounting the double-swirl flame stabilization disk 4 in the double-swirl flame stabilization disk mounting groove 22; the outer circle of the second folding edge 43 is connected with the inner circle of the chassis 42; inner rotary flow grooves 421 formed by special-shaped shutters are uniformly distributed in the middle of the chassis 42 in the circumferential direction, at least 3 inner rotary flow grooves 421 are formed, 5-6 inner rotary flow grooves 421 are further preferably selected, the protruding parts of the inner rotary flow grooves 421 face the inner side of a cone, the opening area of the inner rotary flow grooves 421 is reduced from the outer circle to the inner circle of the chassis 42; the opening end face of the boss 4211 of the inner swirl groove 421 is P1, the plane defined by the central line of the opening end face of the boss 4211 and the central axis of the dual-swirl flame stabilizing disc 4 is P2, the included angle between the P1 and the P2 is 40-60 degrees (the larger the included angle is, the higher the swirl strength is, the flame is short and thick), the included angle between the upper surface of the boss 4211 and the chassis 42 is 25-35 degrees (the larger the included angle is, the lower the swirl strength is, the thinner the flame is), the swirl degree is increased, the flame length can be greatly shortened, but the excessive swirl degree can cause the expansion angle of the airflow to be too large, the fuel oil is caused to collide with the wall to generate serious smoke, and NO is caused to causexThe discharge is too high. Preferably, the ratio of the conicity of the first folding edge 41, the base plate 42 and the second folding edge 43 is [ (1.8-2.2): (3.8-4.2): 1]The thickness span ratio of the double-swirl flame stabilizing disc 4 is [ 1: (6 to 6.6)](ii) a Inner cyclone 421 andthe outer vortex grooves 411 have the same vortex direction and are also secondary air channels, and the central channel formed by the chassis 42 and the second folded edge 43 is a primary air channel 45.
In the combined device of the embodiment of the present application, the specific assembly manner is as follows: the double-swirl flame stabilizing disc 4 is arranged in the double-swirl flame stabilizing disc mounting groove 22 of the combustion cylinder 2 through the mounting support leg 44 on the excircle of the first folding edge 41, the outer conical surface faces the combustion cylinder 2, the double-swirl flame stabilizing disc 4 is screwed in the limit threaded hole 223 through the screw to axially support the mounting support leg 44 of the double-swirl flame stabilizing disc 4 to form axial limit, and the outer conical surface of the first folding edge 41 and the combustion cylinder 2 form a tertiary air channel 46; the tail end barrel U-shaped groove 32 of the tail end barrel 3 is fixedly connected with the tail end barrel mounting threaded hole 23 of the combustion barrel 2 through a screw, and the overlapping area of the backflow hole 31 of the tail end barrel 3 and the combustion barrel 2 is changed by adjusting the axial relative position of the tail end barrel U-shaped groove 32 and the tail end barrel mounting threaded hole 23; the adjusting device 1 is arranged in the middle section of the combustion cylinder 2, the end face of an adjusting cylinder of the adjusting device 1 is arranged in the tertiary air channel 46, and the relative position of the end face of the adjusting cylinder 11 and the first folding edge 41 of the double-cyclone flame stabilizing disc 4 is adjusted through the adjusting rod 12 and is used for controlling the sectional area of the tertiary air channel 46; the oil spraying end of the nozzle 5 is a certain distance away from the double-cyclone flame stabilizing disc 4, and the distance can be adjusted and is generally 3-5 mm; the needle point of the ignition assembly 6 is at a certain distance from the outlet of the nozzle 5, and the distance can be adjusted and is generally 2-3 mm; the adjusting device 1, the combustion cylinder 2, the tail end cylinder 3, the double-swirl flame stabilizing disc 4 and the nozzle 5 are all coaxial when assembled.
When the combined device of the embodiment of the application is applied: when the nozzle 5 sprays fuel into the double-swirl flame stabilizing disc 4, the conical stepped structure of the nozzle gradually increases the internal pressure of the oil-gas mixture, rapidly diffuses towards the periphery, refines fuel particles, strengthens the combustion sufficiency and reduces NOxGenerating; the double-cyclone structure of the inner cyclone 421 and the outer cyclone 411 of the double-cyclone flame stabilizing disc 4 increases the cyclone air distribution intensity, strengthens the turbulence degree of oil mist flame, shortens the flame length, strengthens the full mixing and combustion of diesel atomization and air, avoids the local combustion temperature of flame from being too high, reduces NOxGenerating; the opening area of the inner swirl groove 421 formed by the special-shaped shutter on the double-swirl flame stabilizing disc 4 is reduced from the excircle to the inner circle of the chassis 42, and the structure can lead the inner swirl groove to be communicated with the outer swirl grooveMore air flow passing through the inner swirl groove 421 winds around the flame outer flame, and less air flow is close to the root of the flame, so that the flame stabilizing effect of the flame is facilitated; the combustion cylinder closing-in 21 can gather the tertiary air into a certain taper to guide flame, so as to play a role in gathering fire; the adjusting device 1 can be adjusted to change the sectional area of the primary air channel 45, and under the condition that the air supply volume in the combustion cylinder 2 is constant, the change of the sectional area of the primary air channel 45 can change the primary air volume, the secondary air volume and the tertiary air volume, so that the flame combustion form is changed; the direct current air flow of the tertiary air channel 46 forms a high-speed low-pressure area at the closing-in 21 at the front end of the combustion cylinder 2, so that part of high-temperature flue gas flows back to the root of flame through the return hole 31 of the tail end cylinder 3 under the action of negative pressure gradient and participates in combustion again, the oxygen concentration in the combustion process is reduced, combustion-supporting air is heated, the temperature uniformity of a combustion space is improved, NO is reducedxDischarging of (3); the relative position of the U-shaped groove 32 of the tail end barrel 3 and the mounting threaded hole 23 of the tail end barrel on the combustion barrel 2 is adjusted, and the size of the air inlet of the backflow hole 31 on the barrel wall of the tail end barrel 3 is changed, so that the backflow amount of high-temperature flue gas is controlled, and NO is enabled to bexAnd the discharge is minimum.
At present, the flame length of a 35kW pressure atomization forced air supply electric control diesel burner in the market is 290-380 mm, and NO in smoke gasxThe content is 150-180 mg/m3The flame length of the 35kW pressure atomization forced air supply electric control diesel burner after the device of the embodiment of the application is 170-220 mm, and NO in smoke gasxThe content is 115-140 mg/m3。
The embodiment of the application also relates to a control method for realizing low-nitrogen short-flame combustion of a diesel combustor by adopting the combined device, which at least comprises the following steps:
s1, the primary air has the function of enhancing uniform atomization of fuel oil and avoiding local oil accumulation and combustion, the secondary air has the function of enhancing oil-gas mixing in a combustion area and ensuring full combustion of the fuel oil and changing the flame form, and the tertiary air has the functions of enhancing high-temperature flue gas disturbance, promoting combustion and changing the flame form; the adjusting device 1 is used for changing the sectional area of the tertiary air channel 45, and under the condition that the air supply quantity in the combustion cylinder 2 is constant, the change of the sectional area of the tertiary air channel 46 can change the primary air quantity, the secondary air quantity and the tertiary air quantity, so that the combustion form of flame is changed;
s2, the front end closing-in 21 structure of the combustion cylinder 2, the inner swirl groove 421 on the double-swirl flame stabilizing disc 4 and the conical bottom disc 42 are used for gathering the tertiary air and the secondary air in the inner swirl groove 421 to the center of the combined device, so that the fire gathering performance is enhanced, and the flame is shortened;
s3, by the double-swirl structure of the inner swirl groove 421 and the outer swirl groove 411, the swirl air distribution strength is increased by secondary air on the premise of ensuring that flame is not blown out, the turbulence degree of oil mist flame is enhanced, the flame length is shortened, meanwhile, diesel oil atomization and air are fully mixed and combusted, the local combustion temperature of flame is prevented from being too high, and NO is reducedxGenerating;
s4, forming a high-speed low-pressure area at the closing-in 21 at the front end of the combustion cylinder 2 by using the direct current flow of the tertiary air channel 46, making part of high-temperature flue gas generated by combustion flow back to the root of the flame through the return hole 31 of the tail end cylinder 3 under the action of negative pressure gradient, and participating in combustion again, thereby reducing NOxDischarging of (3);
s5, when the adjusting device 1 is adjusted, the relative position of the U-shaped groove 32 of the tail end barrel on the tail end barrel 3 and the mounting threaded hole 23 of the tail end barrel on the combustion barrel 2 is adjusted according to the flame form, the size of the air inlet of the backflow hole 31 on the barrel wall of the tail end barrel 3 is changed, and therefore the backflow amount of the high-temperature flue gas is controlled, and NO is enabled to be generatedxAnd the emission is minimum.
Although the present application has been described with reference to preferred embodiments, it is not intended to limit the scope of the claims, and many possible variations and modifications may be made by one skilled in the art without departing from the spirit of the application.

Claims (8)

1. A combined device for realizing low-nitrogen short-flame combustion of a diesel burner is characterized by comprising an adjusting device, a combustion barrel, a tail end barrel, a double-cyclone flame stabilizing disc, a nozzle and an ignition assembly;
the tail end cylinder is fixed at the front end of the combustion cylinder, the double-cyclone flame stabilizing disc is fixed inside the front end of the combustion cylinder, the outer conical surface faces the interior of the combustion cylinder, the adjusting device is installed inside the middle section of the combustion cylinder, and the nozzle is fixed inside the middle section of the combustion cylinder; the adjusting device, the combustion cylinder, the tail end cylinder, the double-swirl flame stabilizing disc and the nozzle are coaxial when assembled;
the outer conical surface of the outer edge of the double-cyclone flame stabilizing disc and the combustion cylinder form a tertiary air channel;
one end face of the adjusting device is arranged in the tertiary air channel and used for controlling the sectional area of the tertiary air channel;
the oil spraying end of the nozzle is at a certain distance from the double-swirl flame stabilizing disc.
2. The combination device for realizing low-nitrogen short-flame combustion of the diesel burner as claimed in claim 1, wherein a closing-up structure, a double-swirl flame-stabilizing disc mounting groove and a tail end cylinder mounting threaded hole are sequentially arranged on the combustion cylinder from the end surface along the axial direction at one end of the double-swirl flame-stabilizing disc;
the device comprises a combustion barrel, a double-cyclone flame stabilizing disc, a flame fixing plate and a flame fixing plate, wherein the number of the double-cyclone flame stabilizing disc mounting grooves is 3, the flame stabilizing disc is circumferentially and uniformly arranged on the wall of the combustion barrel, 2 of the double-cyclone flame stabilizing disc are closed grooves, the other 1 of the double-cyclone flame stabilizing disc is a U-shaped groove with an opening at the front end, a limiting threaded hole is formed in the middle of the U-shaped groove of the flame stabilizing disc, the diameter of the outer edge of the double-cyclone flame stabilizing disc is smaller than that of the closing end of the combustion barrel, and the double-cyclone flame stabilizing disc is mounted and fixed in the double-cyclone flame stabilizing disc mounting grooves.
3. The combination unit for realizing low-nitrogen short-flame combustion of the diesel burner as recited in claim 1, wherein at least 2 backflow holes are uniformly arranged on the wall of the tail end barrel in the circumferential direction, 3 axial tail end barrel U-shaped grooves are arranged at the end connected with the combustion barrel, the tail end barrel U-shaped grooves are not communicated with the backflow holes, and the area of coincidence between the tail end barrel backflow holes and the combustion barrel is changed by adjusting the axial relative positions of the tail end barrel U-shaped grooves and the tail end barrel mounting threaded holes, so that the ventilation cross-sectional area of the tail end barrel backflow holes is adjusted.
4. The combination unit for realizing low-nitrogen short-flame combustion of the diesel burner as claimed in claim 1, wherein the adjusting device comprises an adjusting cylinder and an adjusting rod, the adjusting cylinder is axially moved by adjusting the adjusting rod, and during the axial movement, the relative position of the end surface of the adjusting cylinder and the conical surface of the outer edge of the double-cyclone flame stabilizing disc changes, so that the sectional area of a tertiary air channel changes.
5. Combined device for low nitrogen short flame combustion of diesel burners, according to claim 1,
the double-cyclone flame stabilizing disc is of a conical stepped structure and consists of a conical first folded edge, a base plate and a second folded edge;
the inner circle of the first folding edge is connected with the outer circle of the chassis, the first folding edge is provided with radial outer swirl grooves which are uniformly distributed on the circumference, the number of the outer swirl grooves is at least 3, and the outer circle of the first folding edge is uniformly distributed with 3 mounting support legs on the circumference and used for mounting the double-swirl flame stabilization disc in the double-swirl flame stabilization disc mounting groove;
the second flange excircle is connected with the chassis inner circle.
6. Combined device for low nitrogen short flame combustion of diesel burners according to claim 5,
chassis middle part circumference equipartition is equipped with the fashioned internal swirl groove of heterotypic shutter, internal swirl groove is 3 at least, in the internal swirl groove bulge orientation circular cone, follow chassis excircle to interior circle, the open area of internal swirl groove is from big diminish, makes the follow the whirl wind amount of wind that the internal swirl groove came out diminishes by big, is close to the difficult flame that blows out of a small amount of whirl wind of flame root.
7. Combined device for low nitrogen short flame combustion of diesel burners, according to claim 6,
the opening end face of a boss of the inner swirl groove is P1, the plane defined by the central line of the opening end face of the boss and the central axis of the double swirl flame stabilizing disc is P2, and the included angle between P1 and P2 is 40-60 degrees; the included angle between the upper surface of the boss and the chassis is 25-35 degrees;
the inner vortex groove and the outer vortex groove have the same rotating direction and are also secondary air channels, and the central channel formed by the chassis and the second folded edge is a primary air channel.
8. The control method for realizing the low-nitrogen short-flame combustion of the diesel burner by adopting the combined device as claimed in claim 7 is characterized by at least comprising the following steps:
s1, the primary air has the function of enhancing uniform atomization of fuel oil and avoiding local oil accumulation and combustion, the secondary air has the function of enhancing oil-gas mixing in a combustion area and ensuring full combustion of the fuel oil and changing the flame form, and the tertiary air has the functions of enhancing high-temperature flue gas disturbance, promoting combustion and changing the flame form; the adjusting device is used for changing the sectional area of the tertiary air channel, and under the condition that the air supply volume in the combustion cylinder is constant, the change of the sectional area of the tertiary air channel changes the primary air volume, the secondary air volume and the tertiary air volume, so that the flame combustion form is changed;
s2, the front end closing structure of the combustion cylinder, the inner swirl groove on the double-swirl flame stabilizing disc and the conical chassis are used for gathering tertiary air and secondary air in the inner swirl groove to the center of the combined device, so that the fire gathering performance is enhanced, and flame is shortened;
s3, through the double-swirl structure of the inner swirl groove and the outer swirl groove, the secondary air can increase swirl air distribution strength on the premise of ensuring that flame is not blown out, the turbulence degree of oil mist flame is enhanced, the flame length is shortened, meanwhile, diesel atomization and air are fully mixed and combusted, the local combustion temperature of flame is prevented from being too high, and NO is reducedxGenerating;
s4, forming a high-speed low-pressure area at the closing opening at the front end of the combustion cylinder by using the direct-current airflow of the tertiary air channel, so that part of high-temperature flue gas generated by combustionReflows to the root of the flame through the backflow hole of the tail end cylinder under the action of negative pressure gradient, and participates in combustion again, thereby reducing NOxDischarging of (3);
s5, when the adjusting device is adjusted, the relative position of the U-shaped groove of the tail end barrel on the tail end barrel and the mounting threaded hole of the tail end barrel on the combustion barrel is adjusted according to the flame form, and the size of the air inlet of the backflow hole on the barrel wall of the tail end barrel is changed, so that the backflow amount of high-temperature flue gas is controlled, and NO is enabled to be NOxAnd the emission is minimum.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2623759A1 (en) * 1976-05-26 1977-12-01 Kloeckner & Co PRESSURE SPRAY OIL BURNER
CN105402724A (en) * 2015-12-29 2016-03-16 云南航天工业有限公司 Double-cyclone combustor with primary air distribution structure
CN110715291A (en) * 2019-10-24 2020-01-21 江苏徐工工程机械研究院有限公司 Double-cyclone flame stabilizer and heavy oil burner
CN213872692U (en) * 2020-08-24 2021-08-03 广东意高能源科技股份有限公司 Double-swirl flame stabilizing disc of low-nitrogen and ultra-low-nitrogen combustor
CN113483351A (en) * 2021-05-25 2021-10-08 上海工业锅炉研究所有限公司 Industrial boiler air distributor suitable for biodiesel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2623759A1 (en) * 1976-05-26 1977-12-01 Kloeckner & Co PRESSURE SPRAY OIL BURNER
CN105402724A (en) * 2015-12-29 2016-03-16 云南航天工业有限公司 Double-cyclone combustor with primary air distribution structure
CN110715291A (en) * 2019-10-24 2020-01-21 江苏徐工工程机械研究院有限公司 Double-cyclone flame stabilizer and heavy oil burner
CN213872692U (en) * 2020-08-24 2021-08-03 广东意高能源科技股份有限公司 Double-swirl flame stabilizing disc of low-nitrogen and ultra-low-nitrogen combustor
CN113483351A (en) * 2021-05-25 2021-10-08 上海工业锅炉研究所有限公司 Industrial boiler air distributor suitable for biodiesel

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