CN113654038B - Direct-current pulverized coal burner - Google Patents
Direct-current pulverized coal burner Download PDFInfo
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- CN113654038B CN113654038B CN202110941518.5A CN202110941518A CN113654038B CN 113654038 B CN113654038 B CN 113654038B CN 202110941518 A CN202110941518 A CN 202110941518A CN 113654038 B CN113654038 B CN 113654038B
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a direct-flow pulverized coal burner, which belongs to the technical field of boilers and aims to improve the combustion performance of low-load stable combustion and high-efficiency low pollution 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 concentration and dilution separation device, wherein the secondary air box is sleeved outside the primary air pulverized coal pipe and forms a secondary air channel between the primary air pulverized coal pipe and the dilution separation device, 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 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 can be adjusted, so that the flexible adjustment of the burner in the running 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 screen bottom smoke temperature and the like by adjusting the swing angle of the nozzle can be achieved, and the direct-current burner for igniting the central fuel-rich inner flame 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, a pulverized coal combustion technology, namely, pulverized coal airflow is separated into thick-phase and thin-phase airflows by a pulverized coal thick-thin separation device, is widely adopted on a large-scale coal-fired power plant boiler. The dense-phase airflow nozzle is provided with a blunt body and a stable combustion tooth structure to entrain high-temperature smoke, so that three high environments with high pulverized coal concentration, high temperature and high oxygen concentration in a local space are realized, and the dense-phase airflow nozzle is very beneficial to rapid precipitation, ignition and stable combustion of pulverized coal volatile matters and reduction of NOx generation in combustion. However, the existing burner is generally applicable to a specific coal quality range, the ultralow load self-stabilization combustion performance is insufficient, the application range of the boiler burner is reduced, the ignition point of pulverized coal airflow is possibly delayed due to the replacement of coal types and the low load working condition of the boiler during boiler combustion, the combustion stability is poor, the coal burn-out rate is reduced, and NO X Excessive discharge and other related practical operation problems.
Disclosure of Invention
The invention provides a direct-current pulverized coal burner for improving the low-load stable combustion and high-efficiency low-pollution combustion performance of the traditional boiler direct-current pulverized coal burner. The invention has the advantages of wide application range of coal quality, strong ignition stable combustion capability, high coal powder burnout rate, low NOx generation amount, realization of stable combustion of the boiler under the ultralow load working condition of the boiler, realization of vertical larger angle swing of the burner nozzle, improvement of the adjustment flexibility of the burner in the operation process, and regulation and control capability of the flame center and the screen bottom smoke temperature of the hearth under low load.
The technical scheme adopted 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 concentration and dilution 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 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 pulverized coal air channel, the diluted 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, a nozzle is arranged at one end of an air outlet of the primary air pulverized coal pipe in a swinging manner, the nozzle is used for adjusting the air outlet angle through an angle adjusting device, concentrated pulverized coal airflow and diluted pulverized coal airflow which are separated from primary air pulverized coal entering the primary air pulverized coal pipe through the pulverized coal concentration and dilution separation device flow out through the nozzle to form an inner concentrated and outer diluted pulverized coal airflow, and secondary air exhausted from the secondary air box is wrapped on the periphery of the air pulverized coal airflow.
Further, the nozzle comprises a concentrated coal powder nozzle, a light coal powder nozzle and a secondary nozzle from inside to outside in sequence along the longitudinal direction of the primary air coal powder pipe, wherein the concentrated coal powder nozzle, the light coal powder nozzle and the secondary nozzle are in one-to-one correspondence with the concentrated coal powder air duct air outlet, the light coal powder air duct air outlet and the secondary air duct air outlet.
Further, symmetrical inner concave surfaces are respectively arranged on two sides, close to the air outlet, of the primary air pulverized coal pipe, and the inner concave surface portions are positioned in the light pulverized coal nozzle.
Further, the outlet position of the concentrated coal powder nozzle is provided with combustion stabilizing teeth.
The pulverized coal concentration separation device comprises a first baffle, a second baffle, a flow guide body and a primary air pulverized coal elbow;
the first baffle and the second baffle are arranged in the primary air pulverized coal pipe, a concentrated pulverized coal air channel is formed in the primary air pulverized coal pipe along the axial 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, a flow guiding 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 channel and the air outlet port of the primary air pulverized coal elbow, one air inlet end of the primary air pulverized coal elbow is positioned on one opposite side of the flow guiding body, and the flow guiding 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 concentrated pulverized coal air channel. The primary air pulverized coal is concentrated and guided into a concentrated pulverized coal inlet air duct
Further, the first baffle and the second baffle are of flaring structures at the air inlet of the light coal dust air duct.
Further, the first baffle and the second baffle are both provided with baffle bodies at the air outlet of the light coal dust air duct, the inner wall of the air inlet side of the concentrated coal dust nozzle is provided with two arc surfaces, and the baffle bodies are matched with the arc surfaces of the concentrated coal dust nozzle in a one-to-one correspondence manner when the nozzle swings.
Further, the first baffle and the second baffle are fixedly provided with protrusions for wear prevention and flow guide on the surface of one side of the light coal dust air duct, and the protrusions are arranged close to the baffle body.
Further, the protrusions are provided with flow guide surfaces which incline along the flow direction of the dilute-phase pulverized coal airflow in the dilute-pulverized coal air duct.
Further, the spout swings up and down along the horizontal plane by an angle of + -20 deg..
Compared with the prior art, the invention has the following beneficial effects:
1. the primary air pulverized coal is separated by the pulverized coal concentration separation device and sprayed out from the spray nozzle, so that an inner-concentration and outer-concentration airflow is formed and is wrapped by the secondary air, two backflow areas are formed in the flow field at the outlet of the burner in cooperation with the combustion structure of the flow field, and the three-high environment with high pulverized coal concentration, high temperature and high oxygen concentration is formed in the local space related to the backflow areas, so that rapid precipitation of pulverized coal volatile matters, ignition and stable combustion of pulverized coal particles and controllable pulverized coal concentration combustion in the process of reducing NOx generation during combustion can be realized. The stable combustion can be realized under the ultralow load working condition of the boiler, the actual minimum non-oil-feeding stable combustion load of the boiler is reduced, the applicability to coal types is strong, and the method can be widely applied to common coal qualities such as lean coal, bituminous coal and lignite.
2. The nozzle is arranged to swing and can be adjusted, so that the flexible adjustment of the burner in the running 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 screen bottom smoke temperature and the like by adjusting the swing angle of the nozzle can be achieved, and the direct-current burner for igniting the central fuel-rich inner flame 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 examples of the present disclosure and other drawings may be made from these drawings by one of ordinary skill in the art without inventive effort.
FIG. 1 shows a schematic layout of the boiler burner in examples 1 and 2;
fig. 2 shows a schematic view of the burner in examples 1 and 2.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two, but does not exclude the case of at least one.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product 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 product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
The invention adopts a four-corner tangential arrangement mode with thick inside and thin outside, and the two-corner tangential arrangement mode is separated by secondary air, thereby effectively blocking the scouring of coal dust to the furnace wall and avoiding the coking of the furnace wall, and in the coal dust combustion process, the invention not only can realize the staged combustion of thick-phase coal dust airflow and thin-phase coal dust airflow in the vertical direction, but also can realize the staged combustion of the formed thick-phase coal dust airflow and thin-phase coal dust airflow in the horizontal direction, and the staged combustion in the two directions is beneficial to reasonably organizing the flow field, forming stable combustion flame, avoiding the occurrence of local high-temperature areas, and creating an environment for inhibiting the generation of nitrogen oxides.
The invention will be described in further detail with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation mode is given, but the protection scope of the present invention is not limited to the following embodiments.
Example 1
The embodiment provides a direct-current pulverized coal burner, as shown in fig. 1, the direct-current pulverized coal burner comprises a primary air pulverized coal pipe 10, a secondary air box 20 and a pulverized coal concentration and dilution separation device, wherein the secondary air box 20 is sleeved outside the primary air pulverized coal pipe 10 and forms a secondary air channel a between the primary air pulverized coal pipe and the secondary air box, the pulverized coal concentration and dilution separation device is arranged in the primary air pulverized coal pipe 10 to form a concentrated pulverized coal channel b and a light pulverized coal channel c, the concentrated pulverized coal channel b, the light pulverized coal channel c and the secondary air channel a are sequentially arranged along the longitudinal direction of the primary air pulverized coal pipe 10 from inside to outside, one end of an air outlet of the primary air pulverized coal pipe 10 is provided with a spout 40 in a swinging manner, the spout 40 adjusts an air outlet angle through an angle adjusting device, concentrated phase pulverized coal airflow separated from primary air pulverized coal entering the primary air pulverized coal pipe 10 through the pulverized coal concentration and dilution separation device flows out through the spout 40 to form an inner concentrated and outer light pulverized coal airflow, and secondary air exhausted from the secondary air box 20 wraps the periphery of the air airflow.
Alternatively, as shown in fig. 1, the angle adjusting device in this embodiment may include a pull rod 50, a connecting rod 60 and a cylinder, where the pull rod 50 is disposed in the primary air pulverized coal pipe 10, one end of the pull rod 50 is hinged to the nozzle 40, the other end of the pull rod 50 is hinged to the connecting rod 60, the connecting rod 60 passes through the primary air pulverized coal pipe 10 and the secondary air box 20 and is hinged to a push rod of the cylinder, the connecting rod 60 is further hinged to the secondary air box 20, the cylinder is fixedly mounted on an outer side wall of the secondary air box 20, the nozzle 40 is rotatably mounted on an air outlet port of the primary air pulverized coal pipe 10 through a rotating shaft 70, the rotating shaft 70 is located on an axis of the primary air pulverized coal pipe 10, and the pull rod 50 is driven by the cylinder to move along an axis direction of the pull rod, so as to further rotate the nozzle 40 around the rotating shaft 70.
Specifically, the nozzle 40 includes a concentrated coal powder nozzle 41, a light coal powder nozzle 42 and a secondary nozzle 43 sequentially from inside to outside along the longitudinal direction of the primary air pulverized coal pipe 10, the concentrated coal powder nozzle 41, the light coal powder nozzle 42 and the secondary nozzle 43 are in one-to-one correspondence with the air outlet of the concentrated coal powder air duct b, the air outlet of the light coal powder air duct c and the air outlet of the secondary air duct a, the concentrated coal powder nozzle 41, the light coal powder nozzle 42 and the secondary nozzle 43 are in an integral structure, and the simultaneous swing of the concentrated coal powder nozzle 41, the light 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 the combustion air sprayed by the direct-current coal powder burner in the hearth can be changed, and the flame center position can be conveniently adjusted at any time according to the actual running condition of the boiler.
Alternatively, the concentrated coal powder injection nozzle 41, the light coal powder injection nozzle 42 and the secondary injection nozzle 43 are fixed together by welding in the present embodiment. Preferably, symmetrical concave surfaces 11 are respectively disposed on two sides of the primary air pulverized coal pipe 10 adjacent to the air outlet, and the concave surfaces 11 are partially located in the pulverized coal nozzle 42, so that when the nozzle 40 swings, the gap between the primary air pulverized coal pipe 10 and the pulverized coal nozzle 42 is reduced, and secondary air in the burner is prevented from being mixed into pulverized coal airflow in a dilute phase, and the combustion performance is prevented from being affected.
Preferably, the outlet position of the concentrated coal powder nozzle is provided with combustion stabilizing teeth 80, so that turbulent flow pulsation of coal powder airflow of the nozzle is improved, and flame combustion is more stable.
Specifically, the pulverized coal concentration separation device comprises a first baffle 31, a second baffle 32, a flow guide body 33 and a primary air pulverized coal elbow 34; the first baffle 31 and the second baffle 32 are disposed in the primary air pulverized coal pipe 10, a concentrated pulverized coal air channel b is formed in the primary air pulverized coal pipe 10 along the axial direction, a fresh pulverized coal air channel 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, a primary air pulverized coal elbow 34 is fixedly connected to the end portion of the primary air pulverized coal pipe 10 on the air inlet side, the air guide body 33 is fixedly disposed on the inner wall of the primary air pulverized coal pipe 10 and is located between the inlet of the fresh pulverized coal channel c and the air outlet of the primary air pulverized coal elbow 34, the air inlet end of the primary air pulverized coal elbow 34 is located on the opposite side of the air guide body 33, and the air guide body 33 is used for concentrating and guiding primary air pulverized coal entering the primary air pulverized coal pipe 10 into the primary air pulverized coal pipe b into the concentrated pulverized coal channel 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, concentrated phase pulverized coal is formed on the side of the primary air pulverized coal elbow 34 close to the flow guiding body 33, dilute phase pulverized coal is formed on the side far away from the flow guiding body 33, the windward side of the flow guiding body 33 is a flow guiding surface, and the side of the dilute phase pulverized coal is obliquely arranged, so that concentrated air pulverized coal is conveniently introduced into the air inlet of the concentrated pulverized coal air duct b, and the separation of the concentrated phase pulverized coal and the dilute phase pulverized coal 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 channel c, and concentrated primary air coal dust passing through the flow guide body 33 is formed at the flaring position, so that the concentrated air coal dust can more easily enter the light coal dust air channel c, and the separation of the thick air coal dust and the light air coal dust is realized.
Further, the first baffle 31 and the second baffle 32 are respectively provided with a baffle d at the air outlet of the light coal dust air duct c, the inner wall of the air inlet side of the concentrated coal dust nozzle 41 is provided with two circular arc surfaces 411, and when the nozzle swings by ±20°, the baffle d and the circular arc surfaces 411 of the concentrated coal dust nozzle 42 are in one-to-one correspondence and are sealed, so that the light coal dust air flow is prevented from entering the concentrated coal dust air flow to affect the combustion performance.
Further, the surfaces of the first baffle 31 and the second baffle 32 on one side of the fine coal wind channel c are respectively and fixedly provided with a protrusion e for wear prevention and flow guiding, the protrusions e are arranged close to the baffle d, the protrusions e can reduce the scouring of the fine coal on the baffle d, and the sealing performance of the arc surface 411 and the baffle d in cooperation is maintained.
The baffle d may be fixed to the air outlet end of each of the first baffle 31 and the second baffle 32 by welding.
Furthermore, a guide surface e1 is arranged on the protrusion e, and the guide surface e1 is inclined along the flow direction of the dilute-phase pulverized coal airflow in the dilute-pulverized coal air channel c, so that the direct scouring of the dilute-phase pulverized coal airflow to the baffle d is further avoided.
Further, the spout swings up and down along the horizontal plane by an angle of + -20 deg..
Optionally, the air outlet ends of the concentrated coal powder nozzle 41 and the light coal powder nozzle 42 are in flaring structures, and the included angle between the flaring of each of the air outlet ends and the axis of the primary air coal powder pipe 10 is 15-25 degrees.
While the invention has been described in detail in terms of certain specific embodiments, those skilled in the art will appreciate that the foregoing examples are for purposes 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 (8)
1. The direct-flow pulverized coal burner is characterized by comprising a primary air pulverized coal pipe, a secondary air box and a pulverized coal concentration and dilution 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 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 pulverized coal air channel, the diluted 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, a nozzle is arranged at one end of an air outlet of the primary air pulverized coal pipe in a swinging manner, the nozzle adjusts the air outlet angle through an angle adjusting device, concentrated pulverized coal airflow and diluted pulverized coal airflow which are separated from primary air pulverized coal entering the primary air pulverized coal pipe through the pulverized coal concentration and dilution separation device flow out through the nozzle form an inner concentrated and outer diluted pulverized coal airflow, secondary air discharged from the secondary air box is wrapped on the periphery of the air pulverized coal airflow, and the concentrated pulverized coal concentration and dilution separation device comprises a first baffle, a second baffle, a guide fluid and a primary pulverized coal elbow;
the first baffle and the second baffle are arranged in the primary air pulverized coal pipe, a concentrated pulverized coal air channel is formed in the primary air pulverized coal pipe along the axial 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, a flow guiding 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 channel and the air outlet port of the primary air pulverized coal elbow, one air inlet end of the primary air pulverized coal elbow is positioned on one opposite side of the flow guiding body, the flow guiding 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 concentrated pulverized coal air channel, and the first baffle and the second baffle are of a flaring structure at the air inlet of the light pulverized coal channel.
2. The direct current pulverized coal burner of claim 1, wherein the nozzle comprises a concentrated pulverized coal nozzle, a light pulverized coal nozzle and a secondary nozzle in sequence from inside to outside along the longitudinal direction of the primary air pulverized coal pipe, and the concentrated pulverized coal nozzle, the light pulverized coal nozzle and the secondary nozzle are in one-to-one correspondence with the concentrated pulverized coal air channel air outlet, the light pulverized coal air channel air outlet and the secondary air channel air outlet.
3. The direct current pulverized coal burner as set forth in claim 2, wherein said primary air pulverized coal pipe is provided with symmetrical concave surfaces on both sides adjacent to the air outlet, respectively, said concave surface portions being located in said pulverized coal nozzle.
4. A direct current pulverized coal burner as claimed in claim 3, characterized in that the outlet position of the pulverized coal nozzle is provided with combustion stabilizing teeth.
5. The direct-current pulverized coal burner of claim 1, wherein the first baffle plate and the second baffle plate are respectively provided with a baffle body at the air outlet of the thin pulverized coal air duct, the inner wall of the air inlet side of the concentrated pulverized coal nozzle is provided with two arc surfaces, and the baffle bodies are in one-to-one correspondence with the arc surfaces of the concentrated pulverized coal nozzle when the nozzle swings.
6. The direct current pulverized coal burner of claim 5, wherein the first baffle and the second baffle are fixedly provided with protrusions for wear prevention and flow guiding on the surface of one side of the pulverized coal-lean air duct, and the protrusions are arranged adjacent to the baffle.
7. The direct current pulverized coal burner of claim 6, wherein the protrusion is provided with a guide surface, and the guide surface is inclined along the direction of flow of the dilute-phase pulverized coal flow in the dilute-phase pulverized coal duct.
8. A direct current pulverized coal burner as claimed in any one of claims 1 to 7, characterized in that said nozzle is swung up and down along the 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 true CN113654038B (en) | 2023-09-12 |
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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 |
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| CN113654038A (en) | 2021-11-16 |
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