CN113654038A - Direct-current pulverized coal burner - Google Patents
Direct-current pulverized coal burner Download PDFInfo
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- CN113654038A CN113654038A CN202110941518.5A CN202110941518A CN113654038A CN 113654038 A CN113654038 A CN 113654038A CN 202110941518 A CN202110941518 A CN 202110941518A CN 113654038 A CN113654038 A CN 113654038A
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- pulverized coal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
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- 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
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- 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
- F23C7/008—Flow control devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention relates to a direct-current pulverized coal burner, belongs to the technical field of boilers, and aims to improve the low-load stable combustion and high-efficiency low-pollution combustion performance of the existing boiler burner. The invention relates to a direct-current pulverized coal burner which comprises a primary air pulverized coal pipe, a secondary air box and a pulverized coal shade separation device, wherein the secondary air box is sleeved outside the primary air pulverized coal pipe, a secondary air channel is formed between the secondary air box and the primary air pulverized coal pipe, the pulverized coal shade separation device is arranged in the primary air pulverized coal pipe to form a concentrated pulverized coal air channel and a light pulverized coal air channel, and the concentrated pulverized coal air channel, the light pulverized coal air channel and the secondary air channel are sequentially arranged from inside to outside along the longitudinal direction of the primary air pulverized coal pipe. The nozzle is arranged to swing and be adjustable, so that the flexible adjustment of the burner in the operation process is improved, the combustion performance of the direct-current pulverized coal burner is not influenced, the effects of controlling the flame center in a hearth, the smoke temperature at the bottom of a screen and the like by adjusting the swing angle of the nozzle can be achieved, and the direct-current burner on which the flame is ignited and the fuel-rich inner flame in the center has stronger engineering applicability.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a direct-current pulverized coal burner.
Background
At present, on large coal-fired power station boilers, a thick-thin coal powder combustion technology is widely adopted, namely coal powder airflow is separated into thick and thin phase airflow through a coal powder thick-thin separation device. The dense-phase airflow nozzle is provided with a bluff body and a stable combustion tooth structure to absorb high-temperature flue gas, so that three high environments with high pulverized coal concentration, high temperature and high oxygen concentration in local space are realized, and the device is very favorable for rapid separation, ignition and stable combustion of pulverized coal volatile matters and reduction of NOx generation in combustion. However, the existing burner is generally suitable for a specific coal quality range, has insufficient ultralow-load self-stability and flame performance, reduces the application range of the boiler burner, and causes the delay of the ignition point of pulverized coal airflow, poor combustion stability, reduced pulverized coal burnout rate and NO reduction due to the replacement of coal types and low-load working condition of the boiler during the combustion of the boilerXExcessive emissions, and the like.
Disclosure of Invention
The invention provides a straight-flow pulverized coal burner in order to improve the combustion performance of low-load stable combustion and high efficiency and low pollution of the conventional straight-flow pulverized coal burner of a boiler. The invention has the advantages of wide coal quality application range, strong ignition and stable combustion capability, high pulverized coal burnout rate and low NOx generation amount, can realize stable combustion of the boiler under the ultra-low load working condition of the boiler, can realize the vertical and large-angle swing of the nozzle of the burner, is used for improving the adjustment flexibility of the burner in the operation process, and has the regulation and control capability on the flame center and the screen bottom smoke temperature of a hearth under low load.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention discloses a direct-current pulverized coal burner, which comprises a primary air pulverized coal pipe, a secondary air box and a pulverized coal shade separation device, wherein the secondary air box is sleeved outside the primary air pulverized coal pipe, a secondary air channel is formed between the secondary air box and the primary air pulverized coal pipe, the pulverized coal shade separation device is arranged in the primary air pulverized coal pipe to form a concentrated pulverized coal air channel and a light pulverized coal air channel, the concentrated pulverized coal air channel, the light pulverized coal air channel and the secondary air channel are sequentially arranged from inside to outside along the longitudinal direction of the primary air pulverized coal pipe, one end of an air outlet of the primary air pulverized coal pipe is provided with a nozzle in a swinging manner, the nozzle adjusts the air outlet angle through an angle adjusting device, a concentrated-phase pulverized coal airflow and a light-phase pulverized coal airflow which are separated by the pulverized coal shade separation device from the primary air pulverized coal pipe flow through the pulverized coal shade separation device and flow flows out through the nozzle to form an internally concentrated-externally light pulverized coal airflow, and secondary air discharged from the secondary air box wraps the periphery of the air pulverized coal airflow.
Further, the nozzle sequentially comprises a thick coal powder nozzle, a thin coal powder nozzle and a secondary nozzle from inside to outside along the longitudinal direction of the primary air coal powder pipe, and the thick coal powder nozzle, the thin coal powder nozzle and the secondary nozzle are in one-to-one correspondence with the thick coal powder air duct air outlet, the thin coal powder air duct air outlet and the secondary air duct air outlet in butt joint.
Furthermore, symmetrical concave surfaces are respectively arranged on two sides of the primary air pulverized coal pipe close to the air outlet, and the concave surfaces are partially positioned in the light pulverized coal nozzle.
Further, the outlet position of the concentrated coal powder nozzle is provided with a combustion stabilizing tooth.
The coal powder concentration and dilution separation device comprises a first baffle, a second baffle, a flow guide body and a primary air coal powder elbow;
the first baffle and the second baffle are arranged in the primary air pulverized coal pipe, a thick pulverized coal air channel is formed in the primary air pulverized coal pipe along the axis direction, a light pulverized coal air channel is formed between the first baffle and the inner wall of the primary air pulverized coal pipe and between the second baffle and the inner wall of the primary air pulverized coal pipe, a primary air pulverized coal elbow is fixedly connected to the end part of the air inlet side of the primary air pulverized coal pipe, the flow guide body is fixedly arranged on the inner wall of the primary air pulverized coal pipe and is positioned between the inlet of the light pulverized coal air channel and the air outlet port of the primary air pulverized coal elbow, the air inlet end of the primary air pulverized coal elbow is positioned on the opposite side of the flow guide body, and the flow guide body is used for concentrating primary air pulverized coal entering the primary air pulverized coal pipe and guiding the primary air pulverized coal into the thick pulverized coal air channel. The primary air pulverized coal is concentrated and guided into the air duct of the concentrated pulverized coal
Furthermore, the first baffle and the second baffle are in flaring structures at the air inlet of the light pulverized coal air duct.
Further, the first baffle and the second baffle are provided with a baffle at the air outlet of the light pulverized coal air channel, the inner wall of the air inlet side of the concentrated pulverized coal nozzle is provided with two arc surfaces, and when the nozzle swings, the baffle is matched with the arc surfaces of the concentrated pulverized coal nozzle in a one-to-one correspondence manner.
Furthermore, the surface of the first baffle and the surface of the second baffle on one side of the light pulverized coal air duct are both fixedly provided with protrusions for abrasion resistance and flow guiding, and the protrusions are arranged close to the blocking bodies.
Furthermore, a flow guide surface is arranged on the protrusion, and the flow guide surface is inclined along the flow direction of the light-phase coal dust airflow in the light coal dust air duct.
Further, the up-and-down swinging angle of the nozzle along the horizontal plane is +/-20 degrees.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the primary air pulverized coal is separated by the pulverized coal concentration separation device and sprayed out from the nozzle to form air flow with thick inside and thin outside, the air flow is wrapped by secondary air, two backflow areas are formed in the flow field at the outlet of the burner by matching with the combustion organization of the flow field, three high-coal-concentration, high-temperature and high-oxygen-concentration environments are formed in the related local space of the backflow areas, and the pulverized coal concentration combustion with controllable NOx generation process during combustion can be realized. The method can realize stable combustion of the boiler under the ultralow load working condition, reduce the actual minimum oil-throwing stable combustion load of the boiler, has strong applicability to coal types, and can be widely applied to common coal qualities such as lean coal, bituminous coal, lignite and the like.
The nozzle is arranged to swing and be adjustable, so that the flexible adjustment of the burner in the operation process is improved, the combustion performance of the direct-current pulverized coal burner is not influenced, the effects of controlling the center of flame in a hearth, the temperature of smoke at the bottom of a screen and the like by adjusting the swing angle of the nozzle can be achieved, and the direct-current burner on which the central fuel-rich inner flame is ignited has stronger engineering applicability.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
FIG. 1 shows a schematic layout of a boiler burner in examples 1 and 2;
fig. 2 shows a schematic view of the burner in examples 1 and 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The invention adopts a four-corner tangential circle arrangement mode with thick inside and thin outside, rotary pulverized coal airflow is separated from a furnace wall by secondary air, the erosion of pulverized coal to the furnace wall is effectively blocked, the coking of the furnace wall is avoided, the staged combustion of dense-phase pulverized coal airflow and light-phase pulverized coal airflow in the vertical direction can be realized in the pulverized coal combustion process, the staged combustion of the formed dense-inside and thin outside pulverized coal airflow in the horizontal direction is also realized, the staged combustion in the two directions is favorable for reasonably organizing a flow field, stable combustion flame is formed, the occurrence of local high-temperature areas is avoided, and an environment for inhibiting the generation of nitrogen oxides is created.
The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
Example 1
The embodiment provides a direct-flow pulverized coal burner, as shown in fig. 1, comprising a primary air pulverized coal pipe 10, a secondary air box 20 and a pulverized coal shade separation device, wherein the secondary air box 20 is sleeved outside the primary air pulverized coal pipe 10, a secondary air duct a is formed between the primary air pulverized coal pipe 10 and the secondary air duct a, the pulverized coal shade separation device is arranged in the primary air pulverized coal pipe 10 to form a concentrated pulverized coal air duct b and a light pulverized coal air duct c, the concentrated pulverized coal air duct b, the light pulverized coal air duct c and the secondary air duct a are sequentially arranged from inside to outside along the longitudinal direction of the primary air pulverized coal pipe 10, a nozzle 40 is arranged at one end of an air outlet of the primary air pulverized coal pipe 10 in a swinging manner, the nozzle 40 adjusts an air outlet angle through an angle adjustment device, and concentrated-phase pulverized coal airflow and light-phase pulverized coal airflow separated from the primary air pulverized coal pipe 10 through the pulverized coal shade separation device and the light-phase pulverized coal airflow flow out through the nozzle 40 to form concentrated-outside wind pulverized coal airflow, the secondary air discharged from the secondary air box 20 wraps the periphery of the air pulverized coal airflow.
Alternatively, as shown in fig. 1, the angle adjusting means in this embodiment may include a pull rod 50, a connecting rod 60 and a cylinder, the pull rod 50 is arranged in the primary air pulverized coal pipe 10, one end of the pull rod 50 is hinged on the nozzle 40, the other end of the pull rod 50 is hinged with the connecting rod 60, the connecting rod 60 passes through the primary air pulverized coal pipe 10 and the secondary air box 20 to be hinged with the push rod of the cylinder, the connecting rod 60 is also hinged on the secondary air box 20, the cylinder is fixedly arranged on the outer side wall of the secondary air box 20, the nozzle 40 is rotatably installed at the outlet of the primary air pulverized coal pipe 10 through a rotating shaft 70, the rotating shaft 70 is located on the axis of the primary air pulverized coal pipe 10, and the pull rod 50 is driven by the air cylinder to move along the direction of the axis thereof, so that the nozzle 40 further rotates around the rotating shaft 70.
Specifically, the nozzle 40 sequentially comprises a thick coal powder nozzle 41, a thin coal powder nozzle 42 and a secondary nozzle 43 from inside to outside along the longitudinal direction of the primary air coal powder pipe 10, the thick coal powder nozzle 41, the thin coal powder nozzle 42 and the secondary nozzle 43 are in one-to-one correspondence with an air outlet of a thick coal powder air duct b, an air outlet of a thin coal powder air duct c and an air outlet of a secondary air duct a, the thick coal powder nozzle 41, the thin coal powder nozzle 42 and the secondary nozzle 43 are of an integrated structure, and the simultaneous swinging of the thick coal powder nozzle 41, the thin coal powder nozzle 42 and the secondary nozzle 43 can be realized through the adjustment of the angle adjusting device, so that the spraying position of combustion air sprayed by the direct-flow coal powder burner in a hearth is changed, and the central position of flame can be conveniently adjusted at any time according to the actual operation condition of the boiler.
Optionally, in this embodiment, the rich coal nozzle 41, the lean coal nozzle 42, and the secondary nozzle 43 are fixed together by welding. Preferably, the two sides of the primary air pulverized coal pipe 10 close to the air outlet are respectively provided with symmetrical concave surfaces 11, and the concave surfaces 11 are partially positioned in the light pulverized coal nozzles 42, so that when the nozzles 40 swing, the gap between the primary air pulverized coal pipe 10 and the light pulverized coal nozzles 42 is reduced, and the secondary air in the combustor is prevented from being mixed into light-phase pulverized coal airflow to influence the combustion performance.
Preferably, the outlet position of the concentrated coal powder nozzle is provided with a combustion stabilizing tooth 80, so that turbulent flow pulsation of coal powder airflow of the nozzle is improved, and flame combustion is more stable.
Specifically, the coal dust concentration and dilution separation device comprises a first baffle 31, a second baffle 32, a flow guide body 33 and a primary air coal dust elbow 34; the first baffle 31 and the second baffle 32 are arranged in the primary air pulverized coal pipe 10, and a dense pulverized coal air duct b is formed in the primary air pulverized coal pipe 10 along the axial direction, a light pulverized coal duct c is formed between the first baffle 31 and the inner wall of the primary air pulverized coal pipe 10 and between the second baffle 31 and the inner wall of the primary air pulverized coal pipe 10, the end part of the air inlet side of the primary air pulverized coal pipe 10 is fixedly connected with a primary air pulverized coal elbow 34, the flow guide body 33 is fixedly arranged on the inner wall of the primary air pulverized coal pipe 10, and is positioned between the inlet of the fresh coal dust air duct c and the air outlet port of the primary air coal dust elbow 34, the air inlet end of the primary air pulverized coal elbow 34 is located on the opposite side of the flow guide body 33, and the flow guide body 33 is used for concentrating the primary air pulverized coal entering the primary air pulverized coal pipe 10 and guiding the primary air pulverized coal into the concentrated pulverized coal air duct b.
In this embodiment, the primary air pulverized coal flows out from the primary air pulverized coal elbow 34, and due to the inertia effect of the pulverized coal, the primary air pulverized coal elbow 34 is close to one side of the flow guide body 33 to form dense-phase pulverized coal, one side of the primary air pulverized coal elbow 34 far away from the flow guide body 33 to form light-phase pulverized coal, the windward side of the flow guide body 33 is a flow guide surface, and one side of the light-phase pulverized coal is obliquely arranged, so that the dense-air pulverized coal is conveniently introduced into an air inlet of the dense pulverized coal air duct b, and the dense-thin separation is realized.
Further, the first baffle 31 and the second baffle 32 are in a flaring structure at the air inlet of the light coal dust air duct c, and the concentrated primary air coal dust passes through the flow guide body 33 and then is formed at the flaring position, so that the concentrated air coal dust can easily enter the light coal dust air duct c, and the separation of the dense air coal dust and the dense air coal dust is realized.
Further, the first baffle 31 and the second baffle 32 are provided with a baffle d at the air outlet of the light pulverized coal air duct c, the inner wall of the air inlet side of the thick pulverized coal nozzle 41 is provided with two arc surfaces 411, and when the nozzle swings at ± 20 degrees, the baffle d and the arc surfaces 411 of the thick pulverized coal nozzle 42 are correspondingly matched and sealed one by one, so as to prevent the light-phase pulverized coal airflow from entering the thick-phase pulverized coal airflow to influence the combustion performance.
Further, the surfaces of the first baffle 31 and the second baffle 32 on one side of the fresh coal dust air duct c are both fixedly provided with a protrusion e for wear prevention and flow guiding, the protrusion e is arranged close to the baffle d, the protrusion e can reduce the washing of the coal dust on the baffle d, and the sealing performance of the circular arc surface 411 and the baffle d in matching is maintained.
The baffle d may be fixed to respective air outlet ends of the first baffle 31 and the second baffle 32 by welding.
Furthermore, a flow guide surface e1 is arranged on the protrusion e, and the flow guide surface e1 inclines along the flow direction of the light-phase coal dust airflow in the light-phase coal dust air duct c, so that the direct washing of the light-phase coal dust airflow to the baffle body d is further avoided.
Further, the up-and-down swinging angle of the nozzle along the horizontal plane is +/-20 degrees.
Optionally, the air outlet end portions of the concentrated coal powder nozzle 41 and the light coal powder nozzle 42 are respectively of a flaring structure, and the included angle between the flaring of the flaring and the axis of the primary air coal powder pipe 10 is 15-25 degrees.
While the invention has been described in detail and with reference to specific examples thereof, it will be understood by those skilled in the art that the foregoing examples are for the purpose of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A direct-flow pulverized coal burner is characterized by comprising a primary air pulverized coal pipe, a secondary air box and a pulverized coal shade separation device, the secondary air box is sleeved outside the primary air pulverized coal pipe, a secondary air channel is formed between the secondary air box and the primary air pulverized coal pipe, the pulverized coal concentration and dilution separation device is arranged in the primary air pulverized coal pipe to form a concentrated pulverized coal air channel and a diluted pulverized coal air channel, the concentrated coal dust air duct, the light coal dust air duct and the secondary air duct are sequentially arranged from inside to outside along the longitudinal direction of the primary air coal dust pipe, the primary air pulverized coal pipe is characterized in that a nozzle is arranged at one end of an air outlet of the primary air pulverized coal pipe in a swinging mode, the nozzle adjusts an air outlet angle through an angle adjusting device, a dense-phase pulverized coal airflow and a thin-phase pulverized coal airflow which are separated by a pulverized coal thick-thin separating device enter the primary air pulverized coal pipe and flow out through the nozzle to form an inner dense-outer thin air pulverized coal airflow, and secondary air exhausted by the secondary air box wraps the periphery of the air pulverized coal airflow.
2. The direct-flow pulverized coal burner of claim 1, wherein the nozzle comprises a dense pulverized coal nozzle, a thin pulverized coal nozzle and a secondary nozzle sequentially from inside to outside along the longitudinal direction of the primary air pulverized coal pipe, and the dense pulverized coal nozzle, the thin pulverized coal nozzle and the secondary nozzle are in one-to-one correspondence to be butted with the dense pulverized coal air duct air outlet, the thin pulverized coal air duct air outlet and the secondary air duct air outlet.
3. The direct-flow pulverized coal burner of claim 2, wherein symmetrical concave surfaces are respectively arranged on two sides of the primary air pulverized coal pipe close to the air outlet, and the concave surfaces are partially positioned in the light pulverized coal nozzle.
4. The direct-flow pulverized coal burner as claimed in claim 3, wherein the outlet of the pulverized coal enrichment nozzle is provided with combustion stabilizing teeth.
5. The once-through pulverized coal burner of any one of claims 2 to 4, wherein the pulverized coal concentration and dilution separating means comprises a first baffle, a second baffle, a flow guide body and a primary air pulverized coal bend;
the first baffle and the second baffle are arranged in the primary air pulverized coal pipe, a thick pulverized coal air channel is formed in the primary air pulverized coal pipe along the axis direction, a light pulverized coal air channel is formed between the first baffle and the inner wall of the primary air pulverized coal pipe and between the second baffle and the inner wall of the primary air pulverized coal pipe, a primary air pulverized coal elbow is fixedly connected to the end part of the air inlet side of the primary air pulverized coal pipe, the flow guide body is fixedly arranged on the inner wall of the primary air pulverized coal pipe and is positioned between the inlet of the light pulverized coal air channel and the air outlet port of the primary air pulverized coal elbow, the air inlet end of the primary air pulverized coal elbow is positioned on the opposite side of the flow guide body, and the flow guide body is used for concentrating primary air pulverized coal entering the primary air pulverized coal pipe and guiding the primary air pulverized coal into the thick pulverized coal air channel.
6. The once-through pulverized coal burner of claim 5, wherein the first baffle and the second baffle are flared at the air inlet of the pulverized coal duct.
7. The direct-flow pulverized coal burner of claim 5, wherein the first baffle and the second baffle are provided with a baffle at the air outlet of the light pulverized coal duct, the inner wall of the inlet side of the concentrated pulverized coal nozzle is provided with two arc surfaces, and when the nozzle swings, the baffle and the arc surfaces of the concentrated pulverized coal nozzle are correspondingly matched one by one.
8. The direct-flow pulverized coal burner of claim 7, wherein the first baffle and the second baffle are fixed with anti-wear and flow-guiding protrusions on the surface of the pulverized coal duct, and the protrusions are disposed adjacent to the blocking body.
9. The direct-flow pulverized coal burner of claim 7, wherein the protrusion is provided with a flow guide surface, and the flow guide surface is inclined along the flow direction of the light-phase pulverized coal airflow in the light-phase pulverized coal duct.
10. A once-through pulverized coal burner as set forth in any one of claims 1 to 9, wherein said nozzle is swung up and down along a horizontal plane at an angle of ± 20 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110941518.5A CN113654038B (en) | 2021-08-17 | 2021-08-17 | Direct-current pulverized coal burner |
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| CN202110941518.5A CN113654038B (en) | 2021-08-17 | 2021-08-17 | Direct-current pulverized coal burner |
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| CN113654038B CN113654038B (en) | 2023-09-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117704368A (en) * | 2024-01-19 | 2024-03-15 | 南京巨华工业技术有限公司 | Coal-saving burner |
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| CN110274224A (en) * | 2019-06-26 | 2019-09-24 | 东北电力大学 | Rich-lean type coal powder direct supplying burner |
| CN111442263A (en) * | 2020-04-16 | 2020-07-24 | 哈尔滨锅炉厂有限责任公司 | Cyclone burner suitable for pulverized coal concentration separation of lignite |
| CN112325284A (en) * | 2020-11-03 | 2021-02-05 | 哈尔滨锅炉厂有限责任公司 | Low-load stable-combustion burner |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117704368A (en) * | 2024-01-19 | 2024-03-15 | 南京巨华工业技术有限公司 | Coal-saving burner |
| CN117704368B (en) * | 2024-01-19 | 2024-06-18 | 南京巨华工业技术有限公司 | Coal-saving burner |
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