CN213272593U - Pulverized coal burner - Google Patents
Pulverized coal burner Download PDFInfo
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- CN213272593U CN213272593U CN202020876960.5U CN202020876960U CN213272593U CN 213272593 U CN213272593 U CN 213272593U CN 202020876960 U CN202020876960 U CN 202020876960U CN 213272593 U CN213272593 U CN 213272593U
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- pulverized coal
- casing
- coal burner
- burner
- airflow
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Abstract
The utility model provides a pulverized coal burner, pulverized coal burner includes first casing, a plurality of whirl blades, second casing and concentrated ring, concentrated ring sets up the inboard at the inlet end of first casing, and a plurality of whirl blades are installed in the inboard of the end of giving vent to anger of first casing, and the diameter of second casing is less than the diameter of first casing, and the inboard of a plurality of whirl blades and first casing is connected through in the outside of second casing, and a plurality of whirl blades make the buggy formation whirl between first casing and second casing. The advantages of such a device are: the stable combustion capacity of the pulverized coal fired boiler at a low-load stage is effectively improved; simple process, high reliability and strong adaptability.
Description
Technical Field
The utility model relates to a combustion apparatus field particularly, relates to a pulverized coal burner.
Background
The thermal power plant in China faces to a new energy structure situation at present, the share of new energy is increased continuously, low-load operation of the thermal power unit becomes a normal state, the most difficult point of the low-load operation of the thermal power unit is in low-load operation of a boiler, and the low-load stable combustion of the boiler becomes a difficult problem to be solved.
The key of the low-nitrogen combustion and low-load stable combustion of the boiler lies in a combustion technology and a combustor, and the combustor of the conventional pulverized coal boiler has poor stable combustion capability in a low-load stage and cannot meet the requirements of the current operation mode of a thermal power generating unit.
In view of the foregoing, it would be desirable to provide a pulverized coal burner that overcomes the deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a pulverized coal burner, it can overcome prior art's defect. The purpose of the utility model can be realized through the following technical scheme.
An embodiment of the utility model provides a pulverized coal burner, pulverized coal burner includes first casing, a plurality of whirl blades, second casing and concentrated ring, concentrated ring sets up the inboard at the inlet end of first casing, and a plurality of whirl blades are installed in the inboard of the end of giving vent to anger of first casing, and the diameter of second casing is less than the diameter of first casing, and the inboard of a plurality of whirl blades and first casing is connected through the outside of second casing, and a plurality of whirl blades make the buggy form the whirl between first casing and the second casing.
According to the utility model discloses an above-mentioned an embodiment provides a pulverized coal burner, wherein pulverized coal burner still includes the elbow, the elbow is connected with the inlet end of first casing, and the buggy gets into in the first casing through the elbow.
According to the utility model discloses an above-mentioned an embodiment provides a pulverized coal burner, wherein the pulverized coal air current is through the elbow, behind the concentration ring, form the concentrated pulverized coal air current structure of center ratio periphery under the centrifugal force effect, coarse grain dense phase pulverized coal air current gets into furnace from the inboard passageway that forms of second casing, fine grain dilute phase pulverized coal air current gets into furnace from the annular channel between first casing and the second casing, when giving vent to anger the tip blade through the flow, dilute phase pulverized coal air current produces the rotation of appropriate whirl intensity, its axial velocity forms pulverized coal burner spout axial air current together with central pulverized coal air current, tangential velocity forms rotatory air current.
According to the present invention, there is provided a pulverized coal burner as set forth in the above one embodiment, wherein the inner diameter of the concentrating ring is determined according to the size of the pulverized coal burner and the characteristics of the pulverized coal gas flow.
According to the utility model discloses an above-mentioned an embodiment provides a pulverized coal burner, wherein the inboard first buggy passageway that forms of second casing, the entry end of first buggy passageway is apart from concentrated ring 100mm ~ 500mm, the exit end of first buggy passageway and pulverized coal burner give vent to anger the tip parallel and level, first buggy passageway through flow area is 40% ~ 70% of pulverized coal burner through flow area, the distance of the entry end of first buggy passageway apart from concentrated ring is confirmed according to pulverized coal burner size and pulverized coal air flow characteristic, first buggy passageway through flow area distance is confirmed according to pulverized coal burner size and pulverized coal air flow characteristic.
According to the utility model discloses an above-mentioned an embodiment provides the pulverized coal burner, wherein form the second pulverized coal passageway between first shells inner wall and the second shells outer wall, the flow area of second pulverized coal passageway is 30% -60% of pulverized coal burner flow area, and the flow area of second pulverized coal passageway is confirmed according to pulverized coal burner size and pulverized coal air current characteristic.
According to the present invention, there is provided a pulverized coal burner as defined in one of the above embodiments, wherein the shape of the swirl vanes is determined according to the shape of the pulverized coal burner, the airflow characteristics of pulverized coal, and the aerodynamic field in the furnace.
According to the utility model discloses an above-mentioned an embodiment provides a pulverized coal burner, wherein pulverized coal burner adopts high wear-resisting material preparation, and pulverized coal burner's the tip of giving vent to anger adopts wear-resisting, high temperature resistant material preparation.
The pulverized coal burner has the advantages that: the coal powder airflow is classified into a dense-dilute center by utilizing the characteristic that a concentration ring is used for classifying the coal powder airflow, a coal powder channel with mutually independent dense-phase and dilute-phase coal powder is designed innovatively, and a swirl blade is designed at the end part of an annular channel of the dilute-phase coal powder, so that the finally formed coal powder airflow has the axial momentum of tangential combustion coal powder airflow, and the basic principle that the dilute-phase coal powder is rotated to entrain high-temperature smoke to be beneficial to stable combustion of the coal powder is utilized, so that the stable combustion capacity of the coal powder boiler at a low-load stage is; simple process, high reliability and strong adaptability.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 shows a schematic view of a pulverized coal burner according to an embodiment of the present invention;
fig. 2 shows a schematic view of the outlet end of the pulverized coal burner according to an embodiment of the present invention as shown in fig. 1.
Fig. 3 shows a schematic perspective view of the pulverized coal burner according to an embodiment of the present invention as shown in fig. 1.
Detailed Description
Fig. 1-3 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate that variations or substitutions from these embodiments will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Fig. 1 to 3 show a pulverized coal burner according to an embodiment of the present invention, the pulverized coal burner includes a first casing 1, a plurality of swirl blades 2, a second casing 3, and a concentration ring 4, the concentration ring 4 is disposed at an inner side of an air inlet end of the first casing 1, the plurality of swirl blades 2 are installed at an inner side of an air outlet end of the first casing 1, a diameter of the second casing 3 is smaller than that of the first casing 1, an outer side of the second casing 3 is connected through the inner sides of the plurality of swirl blades 2 and the first casing 1, and the plurality of swirl blades 2 make pulverized coal form a swirl between the first casing 1 and the second casing 3.
According to the utility model discloses an above-mentioned an embodiment provides the pulverized coal burner, wherein the pulverized coal burner still includes elbow 5, elbow 5 is connected with the inlet end of first casing 1, and the buggy gets into in the first casing 1 through elbow 5.
According to the pulverized coal burner provided by the above-mentioned one embodiment of the present invention, after the pulverized coal gas flows through the elbow 5 and the concentrating ring 4, a coal dust airflow structure with a thicker center than the periphery is formed under the action of centrifugal force, coarse-particle concentrated-phase coal dust airflow enters a hearth from a channel formed on the inner side of the second shell 3, the fineness of the coarse-particle concentrated-phase coal powder is [ (1.15-1.5) x R90] + [ (15-1.5) x R200], the fine-particle dilute-phase coal powder airflow enters a hearth from an annular channel between the first shell 1 and the second shell 3, the fineness of the fine-particle dilute-phase coal powder is [ (0.3-0.8) x R90] + [ (0.3-0.8) x R200], when the fine-particle dilute-phase coal powder flows through the blades at the air outlet end, the dilute-phase coal powder airflow generates rotation with proper rotational flow strength, the axial velocity and the central coal dust airflow form axial airflow of a nozzle of the coal dust burner, and the tangential velocity forms rotating airflow.
According to the present invention, there is provided the pulverized coal burner as set forth in the above one embodiment, wherein the inner diameter of the concentrating ring 4 is determined according to the size of the pulverized coal burner and the characteristics of the pulverized coal gas flow.
According to the utility model discloses a pulverized coal burner that above-mentioned an embodiment provided, wherein the inboard first buggy passageway 11 that forms of second casing 3, the entry end distance of first buggy passageway 11 is concentrated ring 4100mm ~ 500mm, the exit end of first buggy passageway 11 is given vent to anger the combustor tip parallel and level with the pulverized coal, first buggy passageway 11 through-flow area is 40% ~ 70% of pulverized coal burner through-flow area, the distance of the entry end distance of first buggy passageway 11 concentrated ring 4 is confirmed according to pulverized coal burner size and pulverized coal air flow characteristic, first pulverized coal passageway 11 through-flow area distance is confirmed according to pulverized coal burner size and pulverized coal air flow characteristic.
According to the utility model discloses a pulverized coal burner that above-mentioned an embodiment provided, wherein form second pulverized coal passageway 12 between 1 inner wall of first casing and the 3 outer walls of second casing, the flow area of second pulverized coal passageway 12 is 30% -60% of pulverized coal burner flow area, and the flow area of second pulverized coal passageway 12 is confirmed according to pulverized coal burner size and pulverized coal air current characteristic.
According to the coal burner provided by the above one embodiment of the present invention, the shape of the swirl blade 2 is determined according to the shape of the coal burner, the airflow characteristics of the coal dust and the aerodynamic field in the furnace, and the specific parameter design of the swirl blade 2 has been described in detail in the prior art documents, and references can be made to documents such as "optimization design of axial swirl blade of swirl burner" (1996, 10 months, volume 12, 5 th of power station system engineering) ".
According to the utility model discloses an above-mentioned an embodiment provides a pulverized coal burner, wherein pulverized coal burner adopts high wear-resisting material preparation, and pulverized coal burner's the tip of giving vent to anger adopts wear-resisting, high temperature resistant material preparation.
The pulverized coal burner has the advantages that: the coal powder airflow is classified into a dense-dilute center by utilizing the characteristic that a concentration ring is used for classifying the coal powder airflow, a coal powder channel with mutually independent dense-phase and dilute-phase coal powder is designed innovatively, and a swirl blade is designed at the end part of an annular channel of the dilute-phase coal powder, so that the finally formed coal powder airflow has the axial momentum of tangential combustion coal powder airflow, and the basic principle that the dilute-phase coal powder is rotated to entrain high-temperature smoke to be beneficial to stable combustion of the coal powder is utilized, so that the stable combustion capacity of the coal powder boiler at a low-load stage is; simple process, high reliability and strong adaptability.
It will of course be appreciated that whilst the foregoing has been given by way of example of the present invention, such and other modifications and variations thereto as would be apparent to persons skilled in the art are deemed to fall within the broad scope of the invention as herein set forth. Therefore, while the invention has been described with reference to a preferred embodiment, it is not intended that the novel apparatus be limited thereby, but on the contrary, it is intended to cover various modifications and equivalent arrangements included within the broad scope of the above disclosure and the appended claims.
Claims (8)
1. The utility model provides a pulverized coal burner, its characterized in that, pulverized coal burner includes first casing, a plurality of whirl blades, second casing and concentrated ring, concentrated ring sets up the inboard at the inlet end of first casing, and a plurality of whirl blades are installed in the inboard of the end of giving vent to anger of first casing, and the diameter of second casing is less than the diameter of first casing, and the outside of second casing is connected through the inboard of a plurality of whirl blades and first casing, and a plurality of whirl blades make the buggy through between first casing and the second casing form the whirl.
2. The pulverized coal burner of claim 1, further comprising an elbow connected to the air inlet end of the first housing, the pulverized coal entering the first housing through the elbow.
3. The pulverized coal burner as claimed in claim 2, wherein the pulverized coal airflow passes through the elbow and the concentrating ring, and then forms a pulverized coal airflow structure with a center thicker than the periphery under the action of centrifugal force, the coarse-particle dense-phase pulverized coal airflow enters the furnace from the channel formed inside the second shell, the fine-particle dilute-phase pulverized coal airflow enters the furnace from the annular channel between the first shell and the second shell, and when flowing through the air outlet end blade, the dilute-phase pulverized coal airflow generates rotation with proper rotational flow strength, the axial speed of the dilute-phase pulverized coal airflow and the central pulverized coal airflow form axial airflow of a nozzle of the pulverized coal burner, and the tangential speed forms rotational airflow.
4. The pulverized coal burner of claim 1, wherein an inner diameter of the concentrating ring is determined according to the size of the pulverized coal burner and the characteristics of the pulverized coal gas flow.
5. The pulverized coal burner of claim 1, wherein a first pulverized coal passage is formed inside the second casing, an inlet end of the first pulverized coal passage is 100mm to 500mm away from the concentrating ring, an outlet end of the first pulverized coal passage is flush with an outlet end of the pulverized coal burner, a flow area of the first pulverized coal passage is 40% to 70% of a flow area of the pulverized coal burner, a distance from the inlet end of the first pulverized coal passage to the concentrating ring is determined according to a size of the pulverized coal burner and airflow characteristics of the pulverized coal, and a distance from the flow area of the first pulverized coal passage is determined according to the size of the pulverized coal burner and the airflow characteristics of the pulverized coal.
6. The pulverized coal burner of claim 5 wherein a second pulverized coal passage is formed between the inner wall of the first casing and the outer wall of the second casing, the flow area of the second pulverized coal passage is 30-60% of the flow area of the pulverized coal burner, and the flow area of the second pulverized coal passage is determined according to the size of the pulverized coal burner and the airflow characteristics of the pulverized coal.
7. The pulverized coal burner of claim 1 wherein the shape of the swirl vanes is determined based on the shape of the pulverized coal burner, pulverized coal gas flow characteristics, and aerodynamic field in the furnace.
8. The pulverized coal burner of claim 1 wherein the pulverized coal burner is made of a high wear resistant material and the outlet end of the pulverized coal burner is made of a wear resistant, high temperature resistant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020876960.5U CN213272593U (en) | 2020-05-22 | 2020-05-22 | Pulverized coal burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020876960.5U CN213272593U (en) | 2020-05-22 | 2020-05-22 | Pulverized coal burner |
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| CN213272593U true CN213272593U (en) | 2021-05-25 |
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| CN202020876960.5U Active CN213272593U (en) | 2020-05-22 | 2020-05-22 | Pulverized coal burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111486450A (en) * | 2020-05-22 | 2020-08-04 | 天津国电津能热电有限公司 | Pulverized coal burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111486450A (en) * | 2020-05-22 | 2020-08-04 | 天津国电津能热电有限公司 | Pulverized coal burner |
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Address after: Dabizhuang Industrial Zone, Dongli District, Tianjin Patentee after: Tianjin Guoneng Jinneng Thermal Power Co.,Ltd. Address before: Dabizhuang Industrial Zone, Dongli District, Tianjin Patentee before: TIANJIN GUODIAN JINNENG THERMOELECTRICITY Co.,Ltd. |