CN212841554U - Double-channel reverse-spraying type cyclone burner - Google Patents
Double-channel reverse-spraying type cyclone burner Download PDFInfo
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- CN212841554U CN212841554U CN202021858248.9U CN202021858248U CN212841554U CN 212841554 U CN212841554 U CN 212841554U CN 202021858248 U CN202021858248 U CN 202021858248U CN 212841554 U CN212841554 U CN 212841554U
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Abstract
The utility model relates to a double-channel reverse-spraying type cyclone burner, which comprises a pulverized coal supply mechanism, a transition channel, an inner/outer secondary air duct, a stable combustion cavity and a rectification cavity; the outer secondary air guide cylinder, the stable combustion cavity and the rectification cavity are sequentially connected to form a burner body, the pulverized coal supply mechanism penetrates through the inside of the burner body, and the transition channel is sleeved on the pulverized coal supply mechanism; the inner secondary air duct is arranged between the transition channel and the outer secondary air duct, an inner secondary air channel is formed between the inner secondary air duct and the transition channel, and an outer secondary air channel is formed between the inner secondary air duct and the outer secondary air duct; the outlet end of the inner secondary air duct is provided with a flaring, and the angle of the flaring is the same as that of the combustion stabilizing cavity. The utility model discloses can make the air fall into inside and outside overgrate air and get into the combustor respectively, interior overgrate air combines together with transition channel and makes buggy and air intensive mixing, and outer overgrate air can form along the cooling air bed that surely fires the chamber wall flow surely in surely firing the intracavity, avoids surely firing the emergence of chamber wall deposition coking phenomenon.
Description
Technical Field
The utility model relates to a pulverized coal burner especially relates to a binary channels contrary formula cyclone burner that spouts and application method thereof, belongs to the high-efficient clean technical field that utilizes of coal.
Background
At present, in the field of pulverized coal industrial boilers, various combustors such as a bluff body combustor, a cyclone combustor, a reverse jet combustor and the like appear, and the common point of the combustors is that a high-temperature backflow region is used as an ignition source to ignite pulverized coal airflow, so that the purpose of high-efficiency low-nitrogen combustion of the pulverized coal is achieved. However, the coal powder is violently combusted in the combustor, the temperature in the combustor can reach over 1100 ℃, and the combustor is in a high-temperature combustion area for a long time, so that the phenomenon of high-temperature thermal corrosion exists; and compared with a chain furnace and a circulating fluidized bed, the pulverized coal industrial boiler has the problems of narrow load adjusting range and low burnout rate easily occurring in the low-load operation process.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, it is an object of the present invention to provide a dual-channel reverse-injection cyclone burner with wide load adjustment range, stable combustion and low nitrogen characteristics.
In order to achieve the purpose, the utility model adopts the following technical proposal: a double-channel reverse-spraying type cyclone burner comprises a pulverized coal supply mechanism, a transition channel, an inner secondary air duct, an outer secondary air duct, a stable combustion cavity and a rectifying cavity; the outer secondary air duct, the stable combustion cavity and the rectification cavity are sequentially connected to form a burner body, the pulverized coal supply mechanism penetrates through the inside of the burner body, and the transition channel is sleeved outside the inlet end of the pulverized coal supply mechanism; the inner secondary air duct is arranged between the transition passage and the outer secondary air duct, an inner secondary air passage is formed between the inner secondary air duct and the transition passage, and an outer secondary air passage is formed between the inner secondary air duct and the outer secondary air duct; meanwhile, a flaring is formed at the outlet end of the inner secondary air guide duct, and the angle of the flaring is the same as that of the combustion stabilizing cavity, so that the direction of the outlet end of the inner secondary air channel is parallel to the wall surface of the combustion stabilizing cavity.
The double-channel reverse-spraying type cyclone burner is characterized in that a movable axial impeller assembly is preferably arranged in the inner secondary air channel and is used for enabling inner secondary air to form rotating airflow with tangential speed after passing through the movable axial impeller assembly.
The two-channel reverse-injection cyclone burner preferably comprises the movable axial impeller assembly: the axial impeller is arranged in the inner secondary air channel along the circumferential direction and can move along the axial direction; one end of the adjustable telescopic pull rod is connected with the axial impeller through a first hinge pair; and the locking pull rod is connected with the other end of the adjustable telescopic pull rod through a second hinge pair.
In the two-channel reverse-spraying type cyclone burner, preferably, the number of the cyclones of the rotating airflow generated by the movable axial impeller assembly is controlled within the range of 0-2.
Preferably, the inner secondary air duct and the outer secondary air duct are connected by a plurality of movable positioning assemblies distributed along the circumferential direction, and the movable positioning assemblies are used for adjusting the sectional area of the outer secondary channel.
Preferably, the inner secondary air duct is circumferentially provided with a plurality of threaded holes, the outer secondary air duct is circumferentially provided with a plurality of unthreaded holes, and the outer secondary air duct is a flexible duct wall; meanwhile, the movable positioning assembly mainly comprises an adjusting bolt and a sealing washer, and the adjusting bolt penetrates through the sealing washer and the unthreaded hole of the outer secondary air guide duct and then is in threaded connection with the threaded hole of the inner secondary air guide duct.
The double-channel reverse-spraying type cyclone burner is characterized in that the wind speed of the outer secondary wind is preferably controlled within the range of 20-50 m/s, and the ratio of the inner secondary wind to the outer secondary wind is preferably 1: 2.
The double-channel reverse-spraying type cyclone burner is characterized in that the pulverized coal supply mechanism mainly comprises an air-powder pipe and a backflow cap, the air-powder pipe is arranged on the central axis of the burner body, the backflow cap is arranged at the outlet end of the air-powder pipe and is positioned at the outlet section of the combustion stabilizing cavity, and a plurality of through holes are formed in the combustion stabilizing cavity.
The double-channel reverse-spraying type cyclone burner is characterized in that the transition channel is preferably of a cylindrical structure with one open end and the other closed end, the air powder pipe penetrates through the closed end of the transition channel and then extends into the burner body, and an igniter and/or a flame detector are/is mounted in the transition channel.
The double-channel reverse-spraying type cyclone burner is characterized in that the transition channel is preferably a conical, oval or cylindrical blunt body, the widest diameter of the transition channel is smaller than the inner diameter of the inner secondary air guide duct, and the narrowest diameter of the transition channel is larger than the largest diameter of the igniter and/or the flame detector.
The utility model discloses owing to take above technical scheme, it has following advantage: 1. the utility model discloses interior overgrate air guide duct and outer overgrate air guide duct have been set up, overgrate air and outer overgrate air get into the combustor body respectively in can making the air fall into, not only make the air give the combustor in grades and reduce nitrogen oxide, interior overgrate air combines together with transition channel and makes buggy and air intensive mixing stabilize the burning, and outer overgrate air can form along the cooling air bed that surely fires the chamber wall flow in surely firing the intracavity, with cooling surely fire chamber and rectification chamber, the wall temperature that makes surely fire chamber and rectification chamber is less than 40 ℃ all the time, not only can cancel the water cooling plant who surely fires the chamber, and avoid surely firing the emergence of chamber wall deposition coking phenomenon. 2. The utility model discloses can adjust the sectional area of outer overgrate air passageway through movable positioning assembly, and then adjust the wind speed of outer overgrate air, the mixing rate of overgrate air and outer overgrate air in the control, thereby control the buggy air current at this internal combustion process of combustor, from this at the interior inside hypoxemia of formation of surely burning the intracavity, high temperature, outside hyperoxia, microthermal environment, this kind of temperature distribution and atmosphere distribution, not only can reach the effect of high combustion efficiency and low nitrogen, widen the load adjustment range and the coal type adaptability of combustor, and can effectual solution surely burn room wall high temperature corrosion, phenomenons such as deposition and coking, reduce the maintenance frequency of combustor, the life of extension combustor. 3. The utility model discloses still adopted transition channel's design, this transition channel not only can embed ignition oil gun and igniter, but also transition channel can produce the backward flow district of a high turbulence intensity with built-in movable axial impeller's interior overgrate air passageway combined action, and the mixing rate of reinforcing buggy and air improves the burn-off rate of buggy under the low-load operating mode.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional longitudinal structure of the present invention;
fig. 2 is a schematic structural view of the movable axial impeller assembly of the present invention;
FIG. 3 is a schematic structural view of the movable positioning assembly of the present invention;
fig. 4 is a schematic view of the internal flow field of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. Also in the description of the present invention, it should be understood that the terms "upper", "lower", "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 simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1, the utility model provides a two-channel reverse-spraying cyclone burner, including buggy supply mechanism 1, transition passageway 2, interior overgrate air guide duct 3, outer overgrate air guide duct 4, surely fire chamber 5 and rectification chamber 6. Wherein, outer overgrate air guide duct 4, steady burning chamber 5 and rectification chamber 6 connect in order and constitute the combustor body, and buggy supply mechanism 1 runs through inside the combustor body, and transition passageway 2 cover is established in the outside of the entry end of buggy supply mechanism 1. The inner secondary air duct 3 is arranged between the transition passage 2 and the outer secondary air duct 4, an inner secondary air passage is formed between the inner secondary air duct 3 and the transition passage 2, and an outer secondary air passage is formed between the inner secondary air duct 3 and the outer secondary air duct 4. Meanwhile, a flaring is formed at the outlet end of the inner secondary air duct 3, and the angle of the flaring is the same as that of the combustion stabilizing cavity 5, so that the outlet end direction of the inner secondary air channel is parallel to the wall surface of the combustion stabilizing cavity 5.
In the above embodiment, preferably, as shown in fig. 2, a movable axial impeller assembly 7 is disposed in the inner secondary air passage, and is used for forming a rotating airflow with a tangential speed after the inner secondary air passes through the movable axial impeller assembly 7.
In the above embodiment, the movable axial impeller assembly 7 preferably includes: an axial impeller 71 which is circumferentially disposed in the inner secondary air passage and is axially movable; one end of the adjustable telescopic pull rod 72 is connected with the axial impeller 71 through a first hinge pair; and the locking pull rod 73 is connected with the other end of the adjustable telescopic pull rod 72 through a second hinge pair. Therefore, the axial impeller 71 can move axially to enter and exit the inner secondary air channel by pushing and pulling the locking pull rod 73, and meanwhile, the hinge pair can ensure the smooth movement of the axial impeller 71.
In the above embodiment, the swirl number of the rotating airflow generated by the movable axial impeller assembly 7 is preferably controlled within the range of 0-2.
In the above embodiment, preferably, as shown in fig. 3, the inner secondary air duct 3 and the outer secondary air duct 4 are connected by a plurality of movable positioning assemblies 8 distributed along the circumferential direction, and the movable positioning assemblies 8 are used for adjusting the cross-sectional area of the outer secondary channel.
In the above embodiment, preferably, the inner secondary air guiding duct 3 is circumferentially provided with a plurality of threaded holes 31, the outer secondary air guiding duct 4 is circumferentially provided with a plurality of unthreaded holes 41, and the outer secondary air guiding duct 4 is a flexible duct wall; meanwhile, the movable positioning assembly 8 mainly comprises an adjusting bolt 81 and a sealing washer 82, and the adjusting bolt 81 passes through the sealing washer 82 and the unthreaded hole 41 of the outer secondary air duct 4 and then is in threaded connection with the threaded hole 31 of the inner secondary air duct 3. From this, make outer overgrate air guide duct 4's section of thick bamboo wall produce deformation through precession or precession adjusting bolt 81, with the sectional area of adjusting outer overgrate air, and then adjust the wind speed of outer overgrate air, overgrate air and outer overgrate air's mixing rate in the control, thereby control buggy air current at this internal combustion process of combustor, form an inside hypoxemia in surely firing chamber 5 like this, high temperature, outside hyperoxia, microthermal environment, not only have high-efficiently, the effect of low nitrogen, can also effectually avoid combustor body and furnace deposition, the emergence of coking phenomenon.
In the embodiment, the wind speed of the outer secondary air is preferably controlled within the range of 20-50 m/s, and the proportion of the inner secondary air to the outer secondary air is preferably 1:2, so that stable combustion of pulverized coal can be guaranteed, the inner secondary air is mixed with main flame layer by layer to reduce nitrogen oxides, and the wall-attached outer secondary air has enough momentum to cool the stable combustion cavity 5 and the rectification cavity 6.
In the above embodiment, preferably, as shown in fig. 1, the pulverized coal supply mechanism 1 mainly comprises an air-powder pipe 11 and a backflow cap 12, the air-powder pipe 11 is disposed on the central axis of the burner body, and the backflow cap 12 is disposed at the outlet end of the air-powder pipe 11 and located at the outlet section of the combustion stabilizing chamber 5.
In the above embodiment, the transition passage 2 is preferably a cylindrical structure with one open end and the other closed end, the duct 11 extends into the burner body after penetrating through the closed end of the transition passage 2, and an igniter and/or a flame detector (not shown in the figure) can be installed in the transition passage 2.
In the above embodiment, preferably, the transition passage 2 is conical, elliptical, cylindrical or other blunt body with any curve, and the widest diameter of the transition passage 2 should be smaller than the inner diameter of the inner secondary air duct 3, and the narrowest diameter should be larger than the largest diameter of the igniter and/or the flame detector.
In the above embodiment, preferably, a plurality of through holes (not shown) may be formed in the combustion stabilizing cavity 5 to avoid deformation of the combustion stabilizing cavity 5 due to overheating of the combustion stabilizing cavity 5 caused by unexpected factors.
The utility model provides a binary channels contrary formula cyclone burner that spouts is when using, its work flow as follows:
1) as shown in fig. 4, the air is divided into two paths to enter the burner body, one path of the air forms a rotating inner secondary air with tangential speed after passing through the movable axial impeller assembly 7 and the inner secondary air channel to directly enter the combustion stabilizing cavity 5, and the inner secondary air channel and the transition channel 2 jointly act to form an embedded high-temperature backflow area;
2) meanwhile, the coal dust airflow enters a high-temperature backflow area through a backflow channel formed by the air-powder pipe 11 and the backflow cap 12, the coal dust is in thick-outside and thin-inside concentration distribution, the coal dust is preheated to 900-1000 ℃ through the high-temperature backflow area, the coal dust is pyrolyzed in the low-oxygen and hot high-temperature backflow area, and is mixed with the inner secondary air at the closed end of the transition channel 2 to form main flame, and the coal dust airflow is convoluted and incinerated in the combustor body;
3) the other path of the air forms outer secondary air through an outer secondary air channel, and a part of the outer secondary air forms a cooling air layer flowing along the wall surface of the combustion stabilizing cavity 5 after passing through the flaring of an outer secondary air guide cylinder 4 so as to cool the combustion stabilizing cavity 5 and the rectification cavity 6 and ensure that the wall surface temperature of the combustion stabilizing cavity 5 and the rectification cavity 6 is lower than 40 ℃; the other part of the outer secondary air and the main flame form high-speed jet flame of air-wrapped fire through the rectifying cavity 6 and enter the hearth, so that the pulverized coal is stably combusted, and the phenomena of dust deposition and coking in the combustor body and the hearth are avoided.
In the description of the present invention, it should be understood that the terms "first", "second", "etc. are used to define the components, and are only used for the convenience of distinguishing the components, and if not stated otherwise, the terms have no special meaning, and thus, should not be interpreted as limiting the scope of the present invention.
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 it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A double-channel reverse-spraying type cyclone burner is characterized by comprising a pulverized coal supply mechanism (1), a transition channel (2), an inner secondary air duct (3), an outer secondary air duct (4), a stable combustion cavity (5) and a rectification cavity (6);
the outer secondary air duct (4), the stable combustion cavity (5) and the rectification cavity (6) are sequentially connected to form a burner body, the pulverized coal supply mechanism (1) penetrates through the inside of the burner body, and the transition channel (2) is sleeved outside the inlet end of the pulverized coal supply mechanism (1);
the inner secondary air duct (3) is arranged between the transition passage (2) and the outer secondary air duct (4), an inner secondary air passage is formed between the inner secondary air duct (3) and the transition passage (2), and an outer secondary air passage is formed between the inner secondary air duct (3) and the outer secondary air duct (4);
meanwhile, a flaring is formed at the outlet end of the inner secondary air guide duct (3), and the angle of the flaring is the same as that of the combustion stabilizing cavity (5), so that the direction of the outlet end of the inner secondary air channel is parallel to the wall surface of the combustion stabilizing cavity (5).
2. The dual channel inverted swirl burner of claim 1, wherein a movable axial impeller assembly (7) is disposed within the inner secondary air channel for generating a rotating air stream having a tangential velocity after the inner secondary air passes the movable axial impeller assembly (7).
3. The dual channel reverse-injection cyclonic burner of claim 2, wherein the movable axial impeller assembly (7) comprises:
an axial impeller (71) which is arranged in the inner secondary air channel along the circumferential direction and can move along the axial direction;
one end of the adjustable telescopic pull rod (72) is connected with the axial impeller (71) through a first hinge pair;
and the locking pull rod (73) is connected with the other end of the adjustable telescopic pull rod (72) through a second hinge pair.
4. The dual channel reverse-spray cyclone burner as claimed in claim 3, wherein the swirl number of the rotating air flow generated by the movable axial impeller assembly (7) is controlled within the range of 0-2.
5. The two-channel reverse-injection cyclone burner according to claim 1, wherein the inner secondary air duct (3) and the outer secondary air duct (4) are connected by a plurality of movable positioning assemblies (8) distributed along the circumferential direction, and the movable positioning assemblies (8) are used for adjusting the cross-sectional area of the outer secondary air channel.
6. The dual-channel reverse-injection cyclone burner according to claim 5, wherein the inner secondary air guide duct (3) is circumferentially provided with a plurality of threaded holes (31), the outer secondary air guide duct (4) is circumferentially provided with a plurality of unthreaded holes (41), and the outer secondary air guide duct (4) is a flexible duct wall;
meanwhile, the movable positioning assembly (8) mainly comprises an adjusting bolt (81) and a sealing washer (82), and the adjusting bolt (81) penetrates through the sealing washer (82) and a unthreaded hole (41) of the outer secondary air guide duct (4) and then is in threaded connection with a threaded hole (31) of the inner secondary air guide duct (3).
7. The dual-channel reverse-injection cyclone burner of claim 6, wherein the wind speed of the outer secondary wind is controlled within the range of 20-50 m/s, and the ratio of the inner secondary wind to the outer secondary wind is 1: 2.
8. The two-channel reverse-injection cyclone burner according to any one of claims 1 to 7, wherein the pulverized coal supply mechanism (1) mainly comprises an air-powder pipe (11) and a backflow cap (12), the air-powder pipe (11) is arranged on the central axis of the burner body, the backflow cap (12) is arranged at the outlet end of the air-powder pipe (11) and is positioned at the outlet section of the combustion stabilizing cavity (5), and a plurality of through holes are arranged on the combustion stabilizing cavity (5).
9. The dual-channel reverse-spraying cyclone burner of claim 8, wherein the transition channel (2) is a cylindrical structure with one open end and the other closed end, the air powder pipe (11) penetrates through the closed end of the transition channel (2) and then extends into the inside of the burner body, and an igniter and/or a flame detector are/is installed in the transition channel (2).
10. The dual channel reverse-injection cyclone burner of claim 9, wherein the transition channel (2) is a conical, elliptical or cylindrical bluff body, and the widest diameter of the transition channel (2) should be smaller than the inner diameter of the inner secondary air duct (3) and the narrowest diameter should be larger than the largest diameter of the igniter and/or flame detector.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021858248.9U CN212841554U (en) | 2020-08-31 | 2020-08-31 | Double-channel reverse-spraying type cyclone burner |
| PCT/CN2021/115434 WO2022042732A1 (en) | 2020-08-31 | 2021-08-30 | Two-channel burner and method of use therefor, and multi-channel single-cone burner and method of use therefor |
| US18/002,070 US20230272906A1 (en) | 2020-08-31 | 2021-08-30 | Two-channel burner and method of use therefor, and multi-channel single-cone burner and method of use therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021858248.9U CN212841554U (en) | 2020-08-31 | 2020-08-31 | Double-channel reverse-spraying type cyclone burner |
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| Publication Number | Publication Date |
|---|---|
| CN212841554U true CN212841554U (en) | 2021-03-30 |
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| CN202021858248.9U Active CN212841554U (en) | 2020-08-31 | 2020-08-31 | Double-channel reverse-spraying type cyclone burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022042732A1 (en) * | 2020-08-31 | 2022-03-03 | 煤科院节能技术有限公司 | Two-channel burner and method of use therefor, and multi-channel single-cone burner and method of use therefor |
-
2020
- 2020-08-31 CN CN202021858248.9U patent/CN212841554U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022042732A1 (en) * | 2020-08-31 | 2022-03-03 | 煤科院节能技术有限公司 | Two-channel burner and method of use therefor, and multi-channel single-cone burner and method of use therefor |
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Address after: 100013 room 323, building 1, No.5 qingniangou Road, Hepingli, Chaoyang District, Beijing Patentee after: Beijing Tiandi Sunac Technology Co.,Ltd. Address before: 100013 room 323, building 1, No.5 qingniangou Road, Hepingli, Chaoyang District, Beijing Patentee before: CHINA COAL RESEARCH INSTITUTE (CCRI) ENERGY SAVING TECHNOLOGY CO.,LTD. |
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