CN113483351A - Industrial boiler air distributor suitable for biodiesel - Google Patents

Industrial boiler air distributor suitable for biodiesel Download PDF

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Publication number
CN113483351A
CN113483351A CN202110568905.9A CN202110568905A CN113483351A CN 113483351 A CN113483351 A CN 113483351A CN 202110568905 A CN202110568905 A CN 202110568905A CN 113483351 A CN113483351 A CN 113483351A
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China
Prior art keywords
blade
hub
air
industrial boiler
interior
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CN202110568905.9A
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Chinese (zh)
Inventor
张艳伟
林欣
吕岩岩
汪杰
李梦娜
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Shanghai Industrial Boiler Research Institute Co ltd
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Shanghai Industrial Boiler Research Institute Co ltd
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Priority to CN202110568905.9A priority Critical patent/CN113483351A/en
Publication of CN113483351A publication Critical patent/CN113483351A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • 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
    • 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
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 

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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 invention discloses an industrial boiler air distributor suitable for biodiesel, which comprises: from the central air hose of inside-out distribution and coaxial setting, interior swirler, outer swirler and housing, the front end of housing is provided with combustion-supporting wind export, interior swirler includes interior hub and locates the outer interior blade of interior hub, outer swirler is including setting up in the outer wheel hub of interior hub and locating the outer blade of outer wheel hub, interior blade sets up between interior hub and outer wheel hub, outer blade sets up between outer wheel hub and housing, the whirl direction of interior blade and outer blade is the same, the front end of central air hose is connected with the flame stabilizer. The industrial boiler air distributor is used for air distribution of a biodiesel combustion system, so that combustion-supporting air and biodiesel are uniformly mixed to form a stable flame shape meeting requirements, the temperature in a hearth is uniformly distributed, and pollutants such as dioxin, nitrogen oxides and the like are reduced.

Description

Industrial boiler air distributor suitable for biodiesel
Technical Field
The invention relates to the field of industrial boilers, in particular to an industrial boiler air distributor suitable for biodiesel.
Background
The energy crisis will be a huge challenge facing the development process in the next decades worldwide. Harmful substances generated when petrochemical energy resources are used seriously pollute living environments such as atmosphere and water sources, and form a huge challenge of ecological crisis. To meet the demand of the society for a huge amount of energy, the development of renewable energy sources or the proposal of scientists in the energy field in all countries around the world is already made.
The main power source of automobiles, ships, airplanes, etc. is provided by petrochemical energy, and thus research on clean and renewable substitutes for the petrochemical energy is becoming important. Biodiesel is called as 'green fuel', is an oxygen-containing alternative fuel with the characteristics of no toxicity, biodegradability, renewability and the like, can be mixed with diesel oil in any proportion or directly used, is fatty acid monoester, and is obtained by esterification reaction of animal fat, waste edible oil or plant seeds, fruits and the like serving as raw materials with methanol, ethanol and the like.
Biodiesel is prepared from kitchen waste oil, and the chlorine source of biodiesel is relatively complex, and the biodiesel not only can be organic chlorine existing in raw oil per se, but also can be migration of inorganic chlorine in the preparation process: the micro organic chlorine or organic halogen compounds in the illegal cooking oil can be derived from pesticide residues, a processing and using process of raw oil, a processing and refining process of the illegal cooking oil and the like, and inorganic chloride (sodium chloride) after kitchen processing is usually also present in the illegal cooking oil; in the biodiesel preparation process, HCl is generated by ion exchange reaction of free fatty acids with inorganic salts such as sodium chloride, as shown in the reaction equation of fig. 7.
In the liquid phase, the free HCl may participate in the reaction to generate substances such as chlorinated fatty acid glyceride and the like, and then part of the free HCl enters the biodiesel product. So that dioxin is generated during the combustion of biodiesel. Researches find that dioxin is easy to generate at low temperature, so that the temperature of a hearth needs to be quickly raised to over 850 ℃, the temperature of the hearth is uniformly distributed, and a low-temperature region is reduced.
The fuel oil burner is mainly composed of an atomizer and an air distribution device. On the one hand, the fuel oil delivered from the oil pump is atomized by the atomizer and is finally sprayed into the hearth in the form of liquid drops with extremely small particle size. On the other hand, the flue gas-air mixture sent from the blower is conveyed and distributed by the air distributor to form airflow with certain shape and speed distribution rule. Oil drops and air flow are fully mixed at the front end of the combustor and are rapidly ignited through the ignition electrode, and finally, a stable combustion process is realized. The atomization quality of the atomizer and the air distribution performance of the air distributor directly influence the temperature distribution in the hearth and the burnout of the fuel in the combustion process.
The air distributor is the main component of oil-gas burner, and the air distributor is used to supply air for fuel combustion and form favorable aerodynamic field, so that oil and gas can be well mixed with combustion air, and the combustion is easy, stable and good under the condition of low excess air coefficient.
The air distributor of the key part of the oil burner provides proper amount of root air and secondary air in time, and makes the outlet of the oil burner have high temperature fume reflux area in proper size and position for stable ignition. The air distributor can make the provided air and oil mist mix strongly in the early and late combustion periods of the furnace, so as to reduce the high-temperature decomposition of oil gas and improve the combustion efficiency.
For the biodiesel, the existing air distributor cannot solve the problems of insufficient combustion, such as easy carbon deposition, coking, black smoke emission, high CO content in smoke and the like, which are caused by good airflow organization in the biodiesel combustion process. In addition, because the viscosity of the biodiesel is high, the flame length is long, and the requirement that the volume of a hearth is compact by some equipment is not met, the overlong flame can cause oil drops to hit the hearth or other working media, further worsen combustion and even pollute the working media.
Disclosure of Invention
The invention aims to provide an industrial boiler air distributor suitable for biodiesel, which is used for air distribution of a biodiesel combustion system, so that combustion-supporting air and the biodiesel are uniformly mixed to form a stable and satisfactory flame shape, the temperature distribution in a hearth is uniform, and the generation of pollutants such as dioxin, nitrogen oxides and the like is reduced.
In order to achieve the above object, the present invention provides an industrial boiler register suitable for biodiesel, comprising: from inside to outside central primary air pipe, interior swirler, outer swirler and the housing of just coaxial setting that distributes, the front end of housing is provided with combustion-supporting wind export, interior swirler includes interior hub and locates interior outer inner vane of interior hub, outer swirler including set up in outer hub of interior hub with locate outer blade of outer hub, interior blade set up in between interior hub and the outer hub, outer blade set up in between outer hub and the housing, the whirl direction of interior blade and outer blade is the same, the front end of central primary air pipe is connected with the flame stabilizer.
Preferably, a plurality of slit type inclined openings with inclination of 40-50 degrees are arranged on the inner swirler at equal intervals along the circumferential direction of the inner swirler, and a plurality of slit type inclined openings with inclination of 10-25 degrees are arranged on the outer swirler at equal intervals along the circumferential direction of the outer swirler.
Preferably, the industrial boiler air register further comprises: the industrial boiler air distributor is provided with a primary air door and a secondary air door in the axial direction from the front to the back, the outer barrel is integrally connected with the outer hub, the primary air door is arranged on the outer barrel, and the secondary air door is arranged on the housing.
Preferably, the industrial boiler air register further comprises: the combustion-supporting air adjusting device is a conical interlayer formed between the outer hub outer wall and the housing, and an operating mechanism for adjusting the axial position of the combustion-supporting air adjusting device is arranged in the conical interlayer.
Preferably, a circular hole is formed in the center of the flame holder to form an ignition area, a plurality of louver type ventilation holes are punched around the circular hole in a centering mode on the flame holder, and the direction of the louver type ventilation holes is the same as the rotational flow direction of the inner blade and/or the outer blade.
Preferably, the flame holder comprises: the flame stabilizing disc is connected with the fixing ring through the rod-shaped supports, and the fixing ring is tightly attached to the inner wall of the inner hub and is arranged on the inner hub; the side wall of the fixing ring is provided with a plurality of slotted holes parallel to the radial direction of the central primary air pipe, and the slotted holes are connected with the positions, located between the inner hubs, of the inner hubs through screws, so that the axial position of the flame stabilizing disc can be adjusted.
Preferably, the axial blade coverage of the inner blade and the outer blade is 1.1-1.25.
Preferably, the inner and outer blades are shaped as helically twisted blades, curved blades or straight blades.
Preferably, the outer blade pitch angle βoutsideIs arctan0.5 degrees, and the angle of inclination of the inner blade is betainsideIs arctan0.8 deg..
Preferably, an impeller moving device is connected to the outer cyclone.
According to the technical scheme, the industrial boiler air distributor is used for air distribution of a biodiesel combustion system, so that combustion-supporting air and biodiesel are uniformly mixed to form a stable flame shape meeting the requirements, the temperature in a hearth is uniformly distributed, and pollutants such as dioxin, nitrogen oxides and the like are reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the internal structure of a preferred embodiment of an air register of an industrial boiler;
FIG. 2 is a schematic view of the distribution of the inner cyclone, outer cyclone and shroud;
FIG. 3 is a schematic plan view of a preferred embodiment of a flame holder;
FIG. 4 is a schematic structural view of the inner cyclone, the outer cyclone and the shroud;
FIG. 5 is a schematic view of the distribution of the inner or outer blades;
FIG. 6 is a schematic perspective view of a preferred embodiment of a flame holder;
FIG. 7 is a chemical reaction equation for ion exchange reaction of free fatty acid with sodium chloride.
Description of the reference numerals
1 central primary air pipe 2 primary air door
3 secondary air damper 4 outer cylinder
5 combustion-supporting air adjusting device 6 flame stabilizer
7 combustion-supporting air outlet of push-pull track 8
9 inner hub 10 outer hub
11 outer blade 12 inner blade
13 casing 14 round hole
15 shutter type ventilation hole 16 fixed ring
17 flame stabilizing disc 18 rod-shaped bracket
19 slotted hole
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, directional words included in terms such as "upper, lower, left, right, front, rear, inner, and outer" and the like merely represent the directions of the terms in a normal use state or are colloquially known by those skilled in the art, and should not be construed as limiting the terms.
Referring to fig. 1 to 6, an industrial boiler air register suitable for biodiesel, comprising: from inside to outside distribution and coaxial setting's central primary air pipe 1, interior swirler, outer swirler and housing 13, the front end of housing 13 is provided with combustion-supporting wind export 8, interior swirler includes interior hub 9 and locates interior outer inner vane 12 of interior hub 9, outer swirler including set up in outer hub 10 of interior hub 9 with locate outer impeller hub 10 is outer, inner vane 12 set up in between interior hub 9 and outer impeller hub 10, outer impeller vane 11 set up in between outer impeller hub 10 and the housing 13, inner vane 12 is the same with outer impeller hub 11's whirl direction, the front end of central primary air pipe 1 is connected with flame stabilizer 6.
Through the implementation of the technical scheme, the industrial boiler air distributor is used for air distribution of a biodiesel combustion system, so that combustion-supporting air and biodiesel are uniformly mixed to form a stable flame shape meeting the requirements, the temperature in a hearth is uniformly distributed, and the generation of pollutants such as dioxin, nitrogen oxides and the like is reduced.
The hot air in the working process of the air distributor of the industrial boiler is divided into three parts, one part is called primary air, enters through the primary air damper 2 and rotates through the inner blades 12 to enter a hearth; the other part is called secondary air, enters through an outer blade 11 with a tangential rotational flow blade, rotates and advances, and is contracted and sprayed out at an outlet; the third part is called tertiary air and is fed into the furnace directly through the interlayer formed between the third part and the inner wall of the housing 13. The working principle is as follows: after the combustion-supporting air enters the air distributor of the industrial boiler, the combustion-supporting air is swirled by the swirl vanes on the inner swirler and the outer swirler to form rotating air to enter the combustion port, the primary air passing through the inner swirler enables the fuel (gas or oil mist) to be mixed to a higher degree before combustion, and after ignition, the secondary air passing through the outer swirler enhances the mixing of the combustion-supporting air and the fuel, so that the combustion process is rapidly completed.
In addition, a negative pressure area is formed at the outlet of the inner swirler, so that high-temperature flue gas continuously flows back, and the continuity and stability of combustion flame are ensured. By changing the swirl angle of the inner swirler and the outer swirler, the flame size can be effectively changed. Compared with the common burner, the burner with the high-strength inner swirler and the high-strength outer swirler has the advantages that the flame length can be shortened by about 1/3, and the shape of the flame can be changed according to the actual requirement of a hearth by adjusting the axial relative positions of the primary air swirler and the secondary air swirler.
In this embodiment, in order to obtain a flame shape better meeting the requirements of the furnace, preferably, a plurality of slit-type oblique openings with the inclination of 40-50 degrees are arranged on the inner swirler at equal intervals along the circumferential direction of the inner swirler, and a plurality of slit-type oblique openings with the inclination of 10-25 degrees are arranged on the outer swirler at equal intervals along the circumferential direction of the outer swirler.
In this embodiment, in order to better control the air volume of the primary air, the secondary air and the tertiary air, preferably, the industrial boiler air distributor further comprises: outer cylinder 4, the industry boiler air distributor is opened in the past to the back axial has once wind air door 2 and overgrate air door 3, outer cylinder 4 with foreign steamer 10 body coupling, once wind air door 2 set up in on the outer cylinder 4, overgrate air door 3 sets up on housing 13. The primary air door 2 and the secondary air door 3 are both positioned in the air box, and the corresponding air quantity can be adjusted by adjusting the opening sizes of the primary air door 2 and the secondary air door 3, so that the shape of flame is adjusted.
In this embodiment, preferably, the industrial boiler air register further comprises: the combustion-supporting air adjusting device 5 is a conical interlayer formed between the outer wall of the outer hub 10 and the housing 13, and an operating mechanism for adjusting the axial position of the combustion-supporting air adjusting device 5 is arranged in the conical interlayer. The operating mechanism is a push-pull track 7 provided with a push-pull rod, the push-pull track 7 is connected to the outer wall of the outer hub 10, and the distribution ratio of the secondary air and the tertiary air is adjusted by adjusting the position of the combustion-supporting air adjusting device 5, so that the shape of the flame is adjusted.
In this embodiment, in order to further provide a flame holder 6 to obtain a better flame effect, preferably, a circular hole 14 is opened at the center of the flame holder 6 to form an ignition area, a plurality of louver type ventilation holes 15 are punched on the flame holder 6 around the circular hole 14 in a centered manner, and the direction of the louver type ventilation holes 15 is the same as the swirling direction of the inner blade 12 and/or the outer blade 11.
In this embodiment, in order to further provide a flame holder 6 to obtain better flame effect, preferably, the flame holder 6 includes: the flame stabilizing disc 17 is connected with the fixing ring 16 through the rod-shaped brackets 18, and the fixing ring 16 is tightly attached to the inner hub 9 on the inner wall of the inner hub 9; the side wall of the fixing ring 16 is provided with a plurality of slotted holes 19 along the radial direction parallel to the central primary air duct 1, and the fixing ring is connected with the inner hub 9 at the positions of the slotted holes 19 through screws, so that the axial position of the flame stabilizing disc 17 can be adjusted.
In this embodiment, in order to ensure the swirling effect, it is preferable that the axial blade coverage of the inner blade 12 and the outer blade 11 is 1.1 to 1.25. The blade is the core part of the air distributor of the cyclone industrial boiler and is mainly responsible for guiding airflow to have tangential component velocity so as to generate rotation. As shown in fig. 5, the distribution of the axial blades on the hub is schematically illustrated, the airflow enters the air distributor of the industrial boiler in a direction parallel to the axis of the hub, changes direction through the flow channel between two adjacent blades, and finally flows out along the direction of the blade inclination angle β, where β is defined as the included angle between the blade outlet tangent and the axis of the hub. S in FIG. 5xThe arc length S of the projection of the previous blade curve on the end face of the hubjThe projection arc length of the end face of the hub is made for adjacent blades, and the axial blade coverage is defined as follows:
Figure BDA0003081890340000081
in this embodiment, it is preferable that the inner blade 12 and the outer blade 11 have a shape of a helically twisted blade, a curved blade, or a straight blade, depending on the shape of the blade. The straight blade is the simplest in shape, and the installation angle is the blade inclination angle and is also the included angle between the inlet airflow direction and the blade; the inlet of the curved blade is a straight section generally, parallel to the air inlet direction, and the outlet is a straight section, the direction is the blade installation angle, a section of circular arc is arranged between the inlet and the outlet, and the straight sections of the inlet and the outlet are tangent to the circular arc respectively, and the curved blade is characterized in that the inclination angles of all sections from the root to the top are the same; the three-dimensional structure of the spirally twisted blade is the most complicated, the inclination angle of the root part is smaller than that of the top part, namely, the twisting degree of the blade top part is larger than that of the root part, and the spirally twisted blade is commonly used in an axial movable blade swirler.
The double-cyclone burner has the same rotating direction of the inner and outer cyclones, but the inner and outer blades 11 have different inclination angles, and the inclination angle beta of the outer blade 11 isoutsideIs arctan0.5 degrees, and the angle of inclination beta of the inner blade 12insideIs arctan0.8 deg.. Under the unchangeable condition in control blade angle of inclination, two kinds of structures of straight blade and crooked blade have been designed altogether, because blade root interval is less than the top for root airflow channel is narrow, and airflow resistance is great, and top airflow resistance is little, and this probably leads to upper and lower air velocity inhomogeneous, consequently designs into the structure that varies widely from top to bottom with the blade, and the root width is less than the top, for guaranteeing blade coverage degree load requirement, straight blade inner circle installation 12, outer lane installation 24, crooked blade inner circle installation 15, outer lane installation 30. Through the comparison, the curved blades are still obviously superior to the straight blades in the aspects of reducing resistance loss and speed uniformity even if the installation number of the curved blades is larger than that of the straight blades, so that the curved structure is finally selected as the inner and outer blade 11 structure of the air distributor of the cyclone industrial boiler.
In this embodiment, to facilitate adjustment of the position of the outer swirler, an impeller moving device is preferably connected to the outer swirler. The moving device is like a push-pull rail, the outer cyclone is connected to the push-pull rail, and the push-pull handle pushes the outer cyclone to move.
The industrial boiler air distributor of the burner can effectively strengthen the outlet rotational flow strength of primary air and secondary air and improve the mixing degree of combustion-supporting air and fuel, and the tertiary air is designed into straight-flow air, so that the total flow resistance is reduced, the burning speed is effectively improved, the temperature in a hearth rapidly reaches the highest temperature which is more than 850 ℃, and the generation of dioxin in the hearth in the burning and temperature rising process is reduced. Through increasing the flame diameter and shortening the flame length, the industrial boiler air distributor has good adaptation to various sizes of hearth combustion equipment, and simultaneously, the temperature distribution in the hearth can uniformly reach more than 1000 ℃, so that local low temperature is avoided, and the generation of dioxin in the combustion process is avoided. The air velocity of the industrial boiler air distributor is distributed uniformly along the circumference, and the generation of nitrogen oxides can be reduced.
The industrial boiler air distributor of the invention can produce the following beneficial effects. 1. The resistance loss is small, and the speed level of the air distributor of the industrial boiler is low; the tertiary air is designed to be a straight-flow type, the occupation ratio is large, the flow resistance is small, and the combustion is sufficient; the primary air and the secondary air are separated to obtain smaller twisted blades, and the resistance coefficient is small. 2. The mixing is strong, the combustion is stable, the excess air coefficient can be reduced, the flame distribution is uniform, and a local low-temperature area cannot be generated. 3. The flame length is adjusted sensitively, when the proportion of the secondary air is increased, the proportion of the corresponding tertiary air is reduced, the flame is shortened, the combustion is stronger, and the airflow disturbance is aggravated. The rotary secondary air which mainly acts on the backflow area enables the backflow area to be in a short and thick shape, but is compressed and contained by the cross-injected tertiary air with certain momentum, and a short and thick backflow area is comprehensively formed; when the tertiary air is increased, the tertiary air has larger momentum and weaker rotation, so that the flame length is lengthened, and the combustion is delayed; although the central primary air flow is small, the speed is low, and the rotational flow is weak, the central primary air flow can form a stable backflow area at the root of the flame, and plays a main role in stabilizing combustion. 4. The regulation ratio is large, and the regulation of more than 10:1 of different oil-gas fuels can be realized. 5, the pollutant emission is low, particularly NOx and CO, and three-level air supply is adopted to reduce the NOx emission; the fuel and air are mixed vigorously, the combustion is complete, and unburned carbon is lost.
Compared with the prior art, the invention adopts the structural design of the primary air cyclone and the secondary air cyclone, thereby effectively strengthening the outlet swirl strength of the primary air and the secondary air, improving the mixing degree of combustion-supporting air and fuel and effectively improving the combustion speed. The industrial boiler air distributor has good adaptation to short-hearth combustion equipment by increasing the flame diameter and shortening the flame length. The industrial boiler air distributor has good adaptation to short-hearth combustion equipment, and meanwhile, the temperature in the hearth can be uniformly distributed, so that a local low-temperature zone cannot appear in the hearth, and the generation of dioxin in the hearth is reduced.
In the invention, the distribution ratio of the secondary air and the tertiary air can be adjusted through the sectional area of the conical interlayer, so that proper air quantity is obtained. In the double-cyclone industrial boiler air distributor, because the air flow makes strong rotary motion, the mixing ratio of the biodiesel and the air is strong, a stable backflow area can be generated in the center, the stable ignition and combustion are facilitated, and the air speed of the industrial boiler air distributor is uniformly distributed along the circumference.
Biodiesel is not easily atomized due to its high viscosity. The diameter of the primary air cyclone of the traditional industrial boiler air distributor is small, and no secondary air cyclone blade is arranged, so the flame of the traditional industrial boiler air distributor is in a thin and long state. The adaptability to horizontal type hearth with short length and vertical type hearth with small diameter is poor, the temperature of the hearth can not be uniformly distributed, a local low-temperature zone can appear in the hearth, and the flame size required by the hearth is generally in a short and thick state.
The invention aims to provide the air distributor of the industrial boiler with the combustor, which can effectively strengthen the outlet rotational flow strength of primary air and secondary air, improve the mixing degree of combustion-supporting air and fuel and effectively improve the combustion speed. Through increase flame diameter, shorten flame length, make this industrial boiler air distributor have good adaptation to short furnace combustion apparatus, can make temperature evenly distributed in the furnace simultaneously, local low-temperature zone can not appear in the furnace, reduces the generation of dioxin in the furnace.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. An industrial boiler register adapted for biodiesel, said industrial boiler register comprising: from inside to outside distribution and coaxial central primary air pipe (1) that sets up, interior swirler, outer swirler and housing (13), the front end of housing (13) is provided with combustion-supporting wind export (8), interior swirler includes interior hub (9) and locates interior blade (12) outside interior hub (9), outer swirler including set up in outer wheel hub (10) outside interior hub (9) with locate outer blade (11) outside outer wheel hub (10), interior blade (12) set up in between interior hub (9) and outer wheel hub (10), outer blade (11) set up in between outer wheel hub (10) and housing (13), the whirl direction of interior blade (12) and outer blade (11) is the same, the front end of central primary air pipe (1) is connected with flame stabilizer (6).
2. The air distributor for the biodiesel-applicable industrial boiler as set forth in claim 1, wherein a plurality of slit-type slant openings having a slope of 40-50 ° are provided at equal intervals in the circumferential direction of the inner swirler, and a plurality of slit-type slant openings having a slope of 10-25 ° are provided at equal intervals in the circumferential direction of the outer swirler.
3. The biodiesel-suitable industrial boiler register according to claim 1, further comprising: urceolus (4), industrial boiler air distributor is opened in the past to the back axial has once wind air door (2) and overgrate air door (3), urceolus (4) with foreign steamer hub (10) body coupling, once wind air door (2) set up in on urceolus (4), overgrate air door (3) set up on housing (13).
4. The biodiesel-suitable industrial boiler register according to claim 3, further comprising: the combustion-supporting air adjusting device (5) is a conical interlayer formed between the outer wall of the outer hub (10) and the housing (13), and an operating mechanism for adjusting the axial position of the combustion-supporting air adjusting device (5) is arranged in the conical interlayer.
5. The industrial boiler air distributor applicable to biodiesel according to claim 4, wherein a circular hole (14) is formed in the center of the flame holder (6) to form an ignition area, a plurality of louver-type ventilation holes (15) are punched in the flame holder (6) around the circular hole (14) in a centering manner, and the direction of the louver-type ventilation holes (15) is the same as the rotational flow direction of the inner blade (12) and/or the outer blade (11).
6. Industrial boiler register, adapted for biodiesel according to claim 5, characterized in that the flame holder (6) comprises: the flame stabilizing disc (17) is connected with the fixing ring (16) through the rod-shaped supports (18), and the fixing ring (16) is tightly attached to the inner wall of the inner hub (9) and is arranged on the inner hub (9);
the side wall of the fixed ring (16) is provided with a plurality of strip-shaped slotted holes (19) which are parallel to the radial direction of the central primary air pipe (1), and the side wall of the fixed ring is connected with the positions, located in the strip-shaped slotted holes (19), of the inner hub (9) through screws, so that the axial position of the flame stabilizing disc (17) is adjustable.
7. The industrial boiler register adapted for biodiesel according to claim 1, characterized in that the axial blade coverage of the inner blade (12) and the outer blade (11) is 1.1-1.25.
8. The industrial boiler register adapted for biodiesel according to claim 1, characterized in that the shape of the inner blade (12) and the outer blade (11) is a helically twisted blade, a curved blade or a straight blade.
9. Industrial boiler register, adapted for biodiesel according to claim 1, characterized in that the outer blades (11) have an angle of inclination βoutsideIs arctan0.5 degrees, and the angle of inclination beta of the inner blade (12)insideIs arctan0.8 deg..
10. The biodiesel-suitable industrial boiler air distributor according to claim 1, wherein an impeller moving device is connected to the outer cyclone.
CN202110568905.9A 2021-05-25 2021-05-25 Industrial boiler air distributor suitable for biodiesel Pending CN113483351A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114165783A (en) * 2021-12-14 2022-03-11 军事科学院系统工程研究院军需工程技术研究所 Pressure atomization constant-power diesel burner suitable for complex environment and control method
CN114165782A (en) * 2021-12-14 2022-03-11 军事科学院系统工程研究院军需工程技术研究所 Combined device for realizing low-nitrogen short-flame combustion of diesel burner and control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114165783A (en) * 2021-12-14 2022-03-11 军事科学院系统工程研究院军需工程技术研究所 Pressure atomization constant-power diesel burner suitable for complex environment and control method
CN114165782A (en) * 2021-12-14 2022-03-11 军事科学院系统工程研究院军需工程技术研究所 Combined device for realizing low-nitrogen short-flame combustion of diesel burner and control method
CN114165782B (en) * 2021-12-14 2022-07-12 军事科学院系统工程研究院军需工程技术研究所 Combined device for realizing low-nitrogen short-flame combustion of diesel burner and control method
CN114165783B (en) * 2021-12-14 2022-07-19 军事科学院系统工程研究院军需工程技术研究所 Pressure atomization constant-power diesel burner suitable for complex environment and control method

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