CN210320000U - Power station pulverized coal boiler furnace - Google Patents
Power station pulverized coal boiler furnace Download PDFInfo
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- CN210320000U CN210320000U CN201921049267.4U CN201921049267U CN210320000U CN 210320000 U CN210320000 U CN 210320000U CN 201921049267 U CN201921049267 U CN 201921049267U CN 210320000 U CN210320000 U CN 210320000U
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- side wall
- lateral wall
- pulverized coal
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- rear side
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Abstract
The utility model relates to a power station pulverized coal boiler field, in particular to a power station pulverized coal boiler furnace, which comprises at least 6 vertically arranged side walls, wherein the front side wall and the rear side wall are arranged in parallel, and at least two side walls are arranged between the left edge of the front side wall and the left edge of the rear side wall and between the right edge of the front side wall and the right edge of the rear side wall; burners are arranged on the front side wall and the rear side wall, and openings are arranged at the upper end and the lower end of the hearth. The utility model has the advantages that: so as to avoid forming dead zone, improve aerodynamic field in the furnace and reduce high temperature corrosion.
Description
Technical Field
The utility model relates to a power plant pulverized coal boiler field, concretely relates to power plant pulverized coal boiler furnace.
Background
Nitrogen oxides (NOx) are one of the major atmospheric pollutants emitted by coal-fired power plants. In recent years, with the increasing requirements of China on pollutant emission control, coal-fired power plants generally adopt low NOx combustion control technology for controlling NOx emission.
The boiler adopting the low NOx combustion system has the lower hearth combustion excess air coefficient generally designed to be about 0.8 so as to form local reducing atmosphere in the boiler, thereby inhibiting the generation of NOx, but the existence of the reducing atmosphere can increase the risks of hearth slagging, water wall corrosion and the like; on the other hand, the flue gas flow near the corner of the hearth wall is poor, a backflow area exists, the retention time of the reducing atmosphere at the position is longer, and more serious high-temperature corrosion is caused. The high-temperature corrosion problem almost relates to almost all furnace types such as tangential firing of a direct-current burner, wall type firing of cyclone firing, W-shaped flame firing and the like, and becomes one of the main problems which troubles the daily safe and economic operation of a power plant.
At present, common methods for reducing or preventing high-temperature corrosion of boiler water-cooled walls include: 1. the method for spraying the anticorrosive material on the water wall pipe at high temperature, such as aluminum-iron alloy powder, high-chromium composite powder, or an aluminizing pipe and the like, but the method has higher cost and shorter protection period; 2. wall-attached air is arranged on the left wall and the right wall of the boiler, but the wall-attached air system has large investment and complex structure, and the wall-attached air needs larger air speed, thus easily influencing the combustion stability in the hearth. Several methods for preventing high temperature corrosion are not ideal.
Therefore, a new structural form of the furnace and a corresponding arrangement method of the burner are urgently needed to effectively reduce the high-temperature corrosion problem of the water wall of the boiler without influencing the emission requirement of low NOx of the boiler.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the problem of power station pulverized coal boiler high temperature corrosion among the prior art.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a power station pulverized coal boiler hearth comprises at least 6 vertically arranged side walls, wherein a front side wall and a rear side wall are arranged in parallel, and at least two side walls are arranged between the left edge of the front side wall and the left edge of the rear side wall and between the right edge of the front side wall and the right edge of the rear side wall;
burners are arranged on the front side wall and the rear side wall, and openings are arranged at the upper end and the lower end of the hearth.
Among traditional furnace, follow the rotatory buggy air current that the combustor erupted, burn in the furnace, produce high temperature flue gas, traditional furnace is owing to having four corner walls, easily forms the dead stagnant area of flue gas, and then produces the high temperature corrosion, and the utility model provides a power station pulverized coal boiler furnace, owing to set up 6 at least lateral walls, follow the rotatory buggy air current that the combustor erupted, sufficient burning in furnace produces the high temperature flue gas, the flue gas of the furnace left and right sides can form better mutual flow with the flue gas at furnace middle part, is unlikely to form the dead stagnant area, has improved the aerodynamic field in the stove, and then has alleviateed the high temperature corrosion that probably produces.
Optimally, the number of the side walls is 6, and each side wall is provided with a burner. The hearth with the 6 side walls can avoid the smoke dead zone generated at the corner of the conventional furnace type, reduce the reducing atmosphere near the wall surface and avoid or reduce the possible corrosion; and because each side wall is provided with the burner, the phenomenon that flame is attached to the side or the pipe walls of the left side wall and the right side wall are directly washed away in the conventional furnace type can be prevented, so that the combustion process in the furnace mainly occurs in the middle of a hearth, the abrasion of a heating surface is effectively prevented, the thermal deviation is reduced, and screen over coking and the like are prevented and controlled.
Preferably, the included angle between the two adjacent side walls is 120 degrees. The shape is more regular, and the effect of being convenient for process and preventing to produce high temperature corrosion is better.
Optimized, the lateral wall sets up 6, including preceding lateral wall, posterior lateral wall, left front lateral wall, left back lateral wall, right front lateral wall, left front lateral wall and left back lateral wall junction, right front lateral wall and right back lateral wall junction all are provided with the overgrate air spout. The hearth with the 6 side walls can avoid the smoke dead zone generated at the corner of the conventional furnace type, reduce the reducing atmosphere near the wall surface and avoid or reduce the possible corrosion; and because of two secondary air jets of the secondary air nozzle, the oxygen content on the surface of the inclined wall is increased, the aerodynamic field in the furnace is improved, the combustion process in the furnace mainly occurs in the middle of the hearth, high-temperature flue gas is prevented from directly scouring the pipe wall, the abrasion of a heating surface is effectively prevented, the thermal deviation is reduced, and screen over coking is prevented and controlled.
Optimally, the included angles among the front side wall, the left front side wall and the right front side wall are 135 degrees;
the included angles between the rear side wall and the left and right rear side walls are 135 degrees. The whole shape is more regular, and the effect of preventing high-temperature corrosion is better.
Optimized, the lateral wall sets up 8, and all sets up 3 lateral walls between preceding lateral wall left edge and the back lateral wall left edge, between preceding lateral wall right flank and the back lateral wall right edge. The pulverized coal airflow jetted from the combustor is fully combusted in the hearth, and the generated high-temperature flue gas can form better mutual flow with the flue gas in the middle of the hearth, so that a dead-stagnation area is not formed, the aerodynamic field in the furnace is improved, and the possible high-temperature corrosion of the pipe wall is reduced.
Preferably, the included angle between the two adjacent side walls is 135 degrees. The shape is regular, the processing is convenient, and the effect of preventing high-temperature corrosion is better.
Optimally, the lower end of the hearth is closed. The lower end of the hearth is closed so as to discharge impurities such as furnace slag and the like conveniently.
Preferably, the combustor is a low-nitrogen combustor. The low-nitrogen combustor can generate less nitrogen oxides during working, and meets the emission requirement.
The beneficial effects of the utility model reside in that:
1. among traditional furnace, follow the rotatory buggy air current that the combustor erupted, burn in the furnace, produce high temperature flue gas, traditional furnace is owing to having four corner walls, easily forms the dead stagnant area of flue gas, and then produces the high temperature corrosion, and the utility model provides a power station pulverized coal boiler furnace, owing to set up 6 at least lateral walls, follow the rotatory buggy air current that the combustor erupted, sufficient burning in furnace produces the high temperature flue gas, the flue gas of the furnace left and right sides can form better mutual flow with the flue gas at furnace middle part, is unlikely to form the dead stagnant area, has improved the aerodynamic field in the stove, and then has alleviateed the high temperature corrosion that probably produces.
2. The hearth with the 6 side walls can avoid the smoke dead zone generated at the corner of the conventional furnace type, reduce the reducing atmosphere near the wall surface and avoid or reduce the possible corrosion; and because each side wall is provided with the burner, the phenomenon that flame is attached to the side or the pipe walls of the left side wall and the right side wall are directly washed away in the conventional furnace type can be prevented, so that the combustion process in the furnace mainly occurs in the middle of a hearth, the abrasion of a heating surface is effectively prevented, the thermal deviation is reduced, and screen over coking and the like are prevented and controlled.
3. The included angle between the two adjacent side walls is 120 degrees. The shape is more regular, and the effect of being convenient for process and preventing to produce high temperature corrosion is better.
4. The hearth with the 6 side walls can avoid the smoke dead zone generated at the corner of the conventional furnace type, reduce the reducing atmosphere near the wall surface and avoid or reduce the possible corrosion; and because of two secondary air jets of the secondary air nozzle, the oxygen content on the surface of the inclined wall is increased, the aerodynamic field in the furnace is improved, the combustion process in the furnace mainly occurs in the middle of the hearth, high-temperature flue gas is prevented from directly scouring the pipe wall, the abrasion of a heating surface is effectively prevented, the thermal deviation is reduced, and screen over coking is prevented and controlled.
5. The whole shape is more regular, and the effect of preventing high-temperature corrosion is better.
6. The pulverized coal airflow jetted from the combustor is fully combusted in the hearth, and the generated high-temperature flue gas can form better mutual flow with the flue gas in the middle of the hearth, so that a dead-stagnation area is not formed, the aerodynamic field in the furnace is improved, and the possible high-temperature corrosion of the pipe wall is reduced.
7. The shape is regular, the processing is convenient, and the effect of preventing high-temperature corrosion is better.
8. The lower end of the hearth is closed so as to discharge impurities such as furnace slag and the like conveniently.
9. The low-nitrogen combustor can generate less nitrogen oxides during working, and meets the emission requirement.
Drawings
Fig. 1 is a schematic view of a top view direction of a furnace chamber of a pulverized coal fired power plant boiler according to an embodiment of the present invention;
fig. 2 is a front view of a furnace of a pulverized coal fired boiler of a power station according to a first embodiment of the present invention;
fig. 3 is a left side view of a furnace chamber of a pulverized coal fired boiler of a power station according to a first embodiment of the present invention;
fig. 4 is a schematic view of a top view direction of a furnace chamber of a pulverized coal fired power plant boiler according to a second embodiment of the present invention;
FIG. 5 is a front view of a pulverized coal fired boiler furnace of a power station according to a second embodiment of the present invention;
fig. 6 is a left side view of a furnace chamber of a pulverized coal fired boiler of a power station according to a second embodiment of the present invention;
fig. 7 is a schematic view of a top view direction of a furnace chamber of a pulverized coal fired power plant boiler according to a third embodiment of the present invention;
fig. 8 is a front view of a furnace of a pulverized coal fired boiler of a power station according to a third embodiment of the present invention;
fig. 9 is a left side view of a furnace chamber of a pulverized coal fired boiler of a power station according to a third embodiment of the present invention;
fig. 10 is a schematic view of a top view direction of a furnace chamber of a pulverized coal fired power plant boiler according to a fourth embodiment of the present invention;
fig. 11 is a front view of a furnace of a pulverized coal fired boiler of a power station according to a fourth embodiment of the present invention;
fig. 12 is a left side view of a furnace of a pulverized coal fired boiler of a power station according to a fourth embodiment of the present invention;
wherein, the front side wall-1, the back side wall-2, the burner-3, the left front side wall-4, the left back side wall-5, the right front side wall-6, the right back side wall-7 and the secondary air nozzle-8.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification 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 thus should not be construed as limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1-3, a power plant pulverized coal boiler furnace comprises 6 vertically arranged side walls, wherein a front side wall 1 and a rear side wall 2 are arranged in parallel, two side walls are arranged between the left edge of the front side wall 1 and the left edge of the rear side wall 2 and between the right edge of the front side wall 1 and the right edge of the rear side wall 2, namely, the cross section of the furnace is hexagonal, and the included angle between two adjacent side walls is 120 degrees in the embodiment.
All be provided with combustor 3 on preceding lateral wall 1, the back lateral wall 2, and combustor 3 all evenly arranges according to three rows two on preceding lateral wall 1, the back lateral wall 2, and combustor 3 adopts the low-nitrogen burner, and the opening is all established to the upper and lower extreme of furnace, and the furnace lower extreme binding off.
Example two:
the difference between this embodiment and the first embodiment is:
as shown in fig. 4 to 6, there are 6 side walls, and each side wall is provided with a burner 3, and the burners 3 are uniformly arranged on the other four side walls except the front side wall 1 and the rear side wall 2 in a three-row and one-column manner.
Example three:
the difference between this embodiment and the first embodiment is:
as shown in fig. 7-9, the number of the side walls is 6, the side walls include a front side wall 1, a rear side wall 2, a left front side wall 4, a left rear side wall 5, a right front side wall 6 and a right rear side wall 7, and four secondary air nozzles 8 are respectively arranged at the connection position of the left front side wall 4 and the left rear side wall 5 and the connection position of the right front side wall 6 and the right rear side wall 7.
The included angles between the front side wall 1 and the left and right front side walls 4 and 6 are 135 degrees; the included angle between the rear side wall 2 and the left rear side wall 5 and the right rear side wall 7 is 135 degrees.
In the embodiment, the burners 3 are uniformly arranged on the front side wall 1 and the rear side wall 2 according to four rows and four columns,
example four:
the difference between this embodiment and the first embodiment is:
as shown in fig. 10-12, there are 8 side walls, and 3 side walls are provided between the left edge of the front side wall 1 and the left edge of the rear side wall 2, and between the right edge of the front side wall 1 and the right edge of the rear side wall 2, and the included angle between the two adjacent side walls is 135 °.
The burners 3 are uniformly arranged on the front side wall 1 and the rear side wall 2 according to four rows and five columns.
The working principle is as follows:
among traditional furnace, follow the rotatory buggy air current that combustor 3 erupted, burn in the furnace, produce high temperature flue gas, traditional furnace is owing to having four angle walls, easily forms the dead stagnant area of flue gas, and then produces the high temperature corrosion, and the utility model provides a power station pulverized coal boiler furnace, owing to set up 6 at least lateral walls, follow the rotatory buggy air current that combustor 3 erupted, fully burn in furnace, produce the high temperature flue gas, the flue gas of the furnace left and right sides can form better mutual flow with the flue gas at furnace middle part, is unlikely to form the dead stagnant area, has improved the aerodynamic field in the stove, and then has alleviateed the high temperature corrosion that probably produces.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A power station pulverized coal boiler furnace is characterized in that: the novel multifunctional combined type LED lamp comprises at least 6 vertically arranged side walls, wherein a front side wall (1) and a rear side wall (2) are arranged in parallel, and at least two side walls are arranged between the left edge of the front side wall (1) and the left edge of the rear side wall (2) and between the right edge of the front side wall (1) and the right edge of the rear side wall (2);
burners (3) are arranged on the front side wall (1) and the rear side wall (2), and openings are arranged at the upper end and the lower end of the hearth.
2. The pulverized coal fired power plant boiler furnace according to claim 1, characterized in that: the lateral wall sets up 6, and all is provided with combustor (3) on each lateral wall.
3. The pulverized coal fired power plant boiler furnace according to claim 2, characterized in that: the included angle between the two adjacent side walls is 120 degrees.
4. The pulverized coal fired power plant boiler furnace according to claim 1, characterized in that: the lateral wall sets up 6, including preceding lateral wall (1), posterior lateral wall (2), left front lateral wall (4), left back lateral wall (5), right front lateral wall (6), right back lateral wall (7), left front lateral wall (4) and left back lateral wall (5) junction, right front lateral wall (6) and right back lateral wall (7) junction all are provided with overgrate air spout (8).
5. The pulverized coal fired power plant boiler furnace according to claim 4, characterized in that: the included angles among the front side wall (1), the left front side wall (4) and the right front side wall (6) are 135 degrees;
the included angle between the rear side wall (2) and the left rear side wall (5) and the included angle between the rear side wall (2) and the right rear side wall (7) are 135 degrees.
6. The pulverized coal fired power plant boiler furnace according to claim 1, characterized in that: the lateral wall sets up 8, and all sets up 3 lateral walls between preceding lateral wall (1) left edge and back lateral wall (2) left edge, between preceding lateral wall (1) right edge and back lateral wall (2) right edge.
7. The pulverized coal fired power plant boiler furnace according to claim 6, characterized in that: the included angle between the two adjacent side walls is 135 degrees.
8. The pulverized coal fired power plant boiler furnace according to claim 1, characterized in that: the lower end of the hearth is closed.
9. The pulverized coal fired power plant boiler furnace according to claim 1, characterized in that: the combustor (3) is a low-nitrogen combustor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921049267.4U CN210320000U (en) | 2019-07-05 | 2019-07-05 | Power station pulverized coal boiler furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921049267.4U CN210320000U (en) | 2019-07-05 | 2019-07-05 | Power station pulverized coal boiler furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210320000U true CN210320000U (en) | 2020-04-14 |
Family
ID=70149387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921049267.4U Expired - Fee Related CN210320000U (en) | 2019-07-05 | 2019-07-05 | Power station pulverized coal boiler furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210320000U (en) |
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2019
- 2019-07-05 CN CN201921049267.4U patent/CN210320000U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200414 |
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| CF01 | Termination of patent right due to non-payment of annual fee |