CN113251433A - Rotatable square overgrate air baffle - Google Patents
Rotatable square overgrate air baffle Download PDFInfo
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- CN113251433A CN113251433A CN202110286276.0A CN202110286276A CN113251433A CN 113251433 A CN113251433 A CN 113251433A CN 202110286276 A CN202110286276 A CN 202110286276A CN 113251433 A CN113251433 A CN 113251433A
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- secondary air
- square
- square secondary
- air baffle
- rotating shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
- F23L13/02—Construction of valves or dampers for controlling air supply or draught pivoted about a single axis but having not other movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/007—Regulating air supply or draught using mechanical means
Abstract
The invention discloses a rotatable square secondary air baffle, which comprises a square secondary air pipeline, a square secondary air nozzle, a rotating shaft, a square secondary air baffle, an opening, a motor and a rotating handle. The rotating shaft is positioned near the square secondary air nozzle, a hole is formed in the square secondary air pipeline, and the rotating shaft is inserted into the square secondary air pipeline through the hole; the square secondary air baffle and the rotating shaft are welded in the square secondary air pipeline and the sealing of the rotating shaft and the square secondary air pipeline is ensured; the angle of a square secondary air baffle in the square secondary air pipeline can be changed by adjusting the rotating shaft through a motor or a rotating handle, the area of a square secondary air nozzle is changed, and the air speed of a secondary air outlet is further changed; meanwhile, different widths of the square secondary air baffle plates can be designed according to different requirements on the area of the square secondary air nozzles. The invention is suitable for various working conditions, saves manpower and material consumption, and has good effect on ensuring the stable combustion of flame at the center of the hearth.
Description
Technical Field
The invention relates to the field of heat energy engineering, in particular to design and manufacture of a square secondary air baffle of a coal-fired boiler, which is applied to a square secondary air duct.
Background
When the boiler operates under a rated load, the air volume of the primary air and the air volume of the secondary air are rated air volume, the air speed is high, the air can reach the center of a hearth, and fuel can be fully combusted; however, when the boiler operates under a low-load condition, the required oxygen amount is reduced, the air supply amount of the corresponding primary air and secondary air is reduced, and because the outlet areas of the primary air duct and the secondary air duct are unchanged, the corresponding air speed is reduced, the air cannot reach the center of a hearth, and the combustion is unstable.
If the baffle with a proper structure is arranged in the secondary air duct, when the air supply quantity of the secondary air is reduced, the area of the outlet of the secondary air duct is reduced, the designed wind speed value of the secondary air or the wind speed is not reduced too much, and the secondary air duct is very important for ensuring the combustion stability in the furnace. The load of the boiler changes, the amount of secondary air required is different, in order to adjust the outlet area of the square secondary air pipeline, square secondary air baffles with different structures can be designed, and the outlet area of the secondary air is adjusted, so that the air speed of a secondary air outlet is kept stable, and the stability of central combustion of a hearth is maintained; when the boiler is rated in load, the square secondary air baffle rotates back to the secondary air pipeline, the outlet area of the square secondary air pipeline is still not influenced, and normal air supply is kept. Therefore, a rotatable square secondary air baffle is an urgent need in the art.
Disclosure of Invention
The invention mainly solves the technical problem of providing a rotatable square secondary air baffle plate, so that the area of an outlet of a secondary air pipeline is adjusted along with the change of the secondary air quantity, and the relative stability of the secondary air speed is maintained.
In order to solve the technical problems, the invention adopts a technical scheme that:
the utility model provides a rotatable square overgrate air baffle which characterized in that: the device comprises a square secondary air pipeline 1, a square secondary air nozzle 2, a rotating shaft a3, a rotating shaft b4, a square secondary air baffle a5, a square secondary air baffle b6, a hole a7, a hole b8, a motor a9, a motor b10, a rotating handle a11 and a rotating handle b 12.
The rotating shaft a3 and the rotating shaft b4 have the same structure; the structure of the square secondary air baffle a5 is the same as that of the square secondary air baffle b 6; the motor a9 and the motor b10 have the same structure; the structure of the turning handle a11 is the same as that of the turning handle b 12.
The width and height of the square secondary air baffle a5, the square secondary air baffle b6 and the square secondary air pipeline 1 respectively refer to the distance of the front view (see fig. 2) of the square secondary air pipeline 1 in the horizontal direction and the distance of the square secondary air pipeline 1 in the vertical direction, z1, z2 and z3 in fig. 8 respectively refer to the width of different square secondary air baffles a5, and y/2 in fig. 8 refers to half of the internal width of the square secondary air pipeline 1, namely y refers to the internal width of the square secondary air pipeline 1; x1, x2 and x3 in fig. 8 are distances from the edge of the baffle to the wall surface of the corresponding air duct when the square secondary air baffle a5 or the square secondary air baffle b6 is in a working state, and the distances are calculated according to the area of the required square secondary air nozzle 2; h of fig. 8 is the distance from the center of the rotational axis a3 and the rotational axis b4 to the square overfire air nozzle 2. The widths of the square secondary air baffle a5 and the square secondary air baffle b6 are the same and are less than half of the internal width of the square secondary air pipeline 1 so as to prevent the two baffles from colliding with each other during simultaneous adjustment, and the specific widths are calculated according to the x and the h.
The height of square overgrate air baffle a5 and square overgrate air baffle b6 is less than the inside height of square overgrate air pipeline 1, as shown in fig. 2, the upper and lower terminal surface and the pipeline inner wall distance of square overgrate air baffle a5 and square overgrate air baffle b6 are 3mm respectively, the upper and lower end and the pipeline of baffle are clearance fit, fig. 2 only marks the clearance of baffle upper end and overgrate air pipeline, the baffle lower extreme is the same with the clearance of pipeline, no additional mark, it is conventional sealing mode to seal between baffle and square overgrate air pipeline 1, it is not repeated here, and even leak a small amount of wind also directly to send into furnace, do not influence the burning in the stove.
The square secondary air baffle a5 and the square secondary air baffle b6 can be arranged on the left side and the right side, or can be arranged up and down, and the square secondary air baffle a5 and the square secondary air baffle b6 are arranged on the left side and the right side so that the rotary handle a11 and the rotary handle b12 can be adjusted on site conveniently, and therefore the square secondary air baffle a5 and the square secondary air baffle b6 are recommended to be arranged on the left side and the right side. If the site conditions are limited, if the space position is insufficient, the square secondary air baffle a5 and the square secondary air baffle b6 can be arranged up and down.
The rotating shaft a3 and the rotating shaft b4 are positioned near the square secondary air nozzle 2, and the holes at the two sides of the square secondary air pipeline 1 are respectively a hole a7 and a hole b8 and are symmetrical left and right; the distance between the positions of the holes of the hole a7 and the hole b8 and the square secondary air nozzle 2 is equal to one tenth of the internal width of the square secondary air pipeline 1, and the widths of the square secondary air baffle a5 and the square secondary air baffle b6 are determined according to the required area of the square secondary air nozzle 2. Taking fig. 8 as an example: aiming at a combination of x1, y/10 and z1 of a scheme, wherein y/10 is determined, the area of a secondary air outlet after baffle control can be determined according to the secondary air outlet speed required by the site, the width y/2-x1 in the figure 8 can be determined according to the area of the secondary air outlet, further, the distance x1 is determined, and after two right-angle sides x1 and y/10 in a right-angle triangle are determined, the hypotenuse z1 (the width of the secondary air baffle) is determined; to ensure that the overfire air baffle width is less than y/2, x1 should be less than
If the required secondary tuyere area is small, x1 is larger than
Then h should be less than y/10, i.e. the rotating shaft a3 and the rotating shaft b4 move to the vicinity of the square overgrate air nozzle 2 respectively, so as to ensure that the widths of the square overgrate air baffle a5 and the square overgrate air baffle b6 are less than y/2.
The rotating shaft a3 and the rotating shaft b4 are inserted into the square secondary air duct 1 through the hole a7 and the hole b8, respectively; the square secondary air baffle a5 and the rotating shaft a3 are welded in the square secondary air pipeline 1 and ensure that the rotating shaft a3 is sealed with the square secondary air pipeline 1, the square secondary air baffle b6 and the rotating shaft b4 are welded in the square secondary air pipeline 1 and ensure that the rotating shaft b4 is sealed with the square secondary air pipeline 1, and the rotating shaft a3 and the rotating shaft b4 are sealed with the square secondary air pipeline 1 in a conventional sealing mode, which is not described herein any more.
The rotational axis a3 and rotational axis b4 may also be manually adjusted by circumscribing rotational handle a11 and rotational handle b 12.
The motor a9 is connected with the rotating shaft a3 and controls the rotation of the rotating shaft a 3; the motor b10 is connected with the rotating shaft b4 and controls the rotation of the rotating shaft b 4; the rotating shaft a3 and the rotating shaft b4 can be controlled to rotate respectively or simultaneously; the rotation of the rotating shaft a3 controlled by the motor a9 and the rotation of the rotating shaft b4 controlled by the motor b10 are both carried out at the time of low load, so that the excessive wind speed in the square secondary wind pipeline 1 at the time of high load is prevented, the resistance of the square secondary wind baffle a5 and the square secondary wind baffle b6 is prevented from being large, and the rotation resistance is increased; during the adjustment of the square overgrate air baffle a5 and the square overgrate air baffle b6, the two baffles can be adjusted sequentially or simultaneously, and the square overgrate air baffle a5 and the square overgrate air baffle b6 are preferably adjusted simultaneously. In the process of reducing the load of the boiler, after the load of the boiler is reduced to the minimum value, the square overgrate air baffle a5 and the square overgrate air baffle b6 are rotated at the same time, the square overgrate air baffle a5 and the square overgrate air baffle b6 rotate along the flowing direction of overgrate air, and after the square overgrate air baffle a5 and the square overgrate air baffle b6 rotate to the right positions, the tail ends of the square overgrate air baffle a5 and the square overgrate air baffle b6 are flush with the square overgrate air nozzle 2 (see fig. 6); in the process of the load increase of the boiler, firstly, the square overgrate air baffle a5 and the square overgrate air baffle b6 are rotated simultaneously, the square overgrate air baffle a5 and the square overgrate air baffle b6 are rotated against the flowing direction of overgrate air, the rear overgrate air baffle a5 and the square overgrate air baffle b6 are attached to the inner wall of the square overgrate air pipeline 1 after the rotation is finished (see figure 1), and after the operation is finished, the load increase operation of the boiler is started again.
The square secondary air baffle a5 and the square secondary air baffle b6 are attached to the inner wall surface of the square secondary air pipeline 1 in the opposite direction of the square secondary air nozzle 2 when the unit is fully loaded; the maximum rotation angles of the square secondary air baffle a5 and the square secondary air baffle b6 towards the square secondary air nozzle 2 are the angles when the right end of the square secondary air baffle a5 and the left end of the square secondary air baffle b6 are respectively aligned with the square secondary air nozzle 2, and the baffles cannot rotate continuously to prevent the baffles from extending into a hearth and being burnt; when the square secondary air baffle a5 and the square secondary air baffle b6 are fully opened, the square secondary air nozzle 2 rotates in the opposite direction to be tightly attached to the left and right pipe walls of the square secondary air pipeline 1. The staff can control the rotation of axis of rotation a3 and axis of rotation b4 through control motor a9 and motor b10 or rotation handle a11 and rotation handle b12, change square overgrate air baffle a5 and square overgrate air baffle b6 and the angle of square overgrate air duct 1 internal wall face in the square overgrate air duct 1, change the exit area of square overgrate air duct 1, and then change the exit wind speed of square overgrate air duct 1, make overgrate air export wind speed keep stable, maintain the stability of furnace center burning.
The invention has the beneficial effects that:
compared with the original secondary air outlet without the baffle, the rotatable square secondary air baffle can change the area of the secondary air outlet according to the load of the boiler and keep the speed of the secondary air. When the boiler is under low load, the secondary air volume is low, the area of a secondary air outlet can be reduced, the secondary air speed is kept or the secondary air speed is not reduced too much, the secondary air speed is close to the design value of the rated load, the secondary air can still be blown to the central position of the hearth, and the stable combustion of flame at the center of the hearth is ensured.
Drawings
FIG. 1 is a maximum opening view of a rotatable square overfire air baffle according to the present invention;
FIG. 2 is a front view of a rotatable square overfire air baffle of the present invention at its maximum opening;
FIG. 3 is an open-hole view of a rotatable square secondary air baffle of the present invention;
FIG. 4 is a schematic view of a rotatable square overfire air baffle according to the present invention;
FIG. 5 is a bottom view of a schematic of a weld of a rotatable square secondary air baffle of the present invention;
FIG. 6 is a close-up view of a rotatable square overfire air damper of the present invention;
FIG. 7 is a close-up elevational view of a rotatable square overfire air damper of the present invention;
FIG. 8 is a schematic view of a baffle width calculation for a rotatable square overfire air baffle according to the present invention;
FIG. 9 is a schematic view of a manual adjustment of a rotatable square overfire air baffle according to the present invention;
Detailed Description
The invention is further described in detail below with reference to the drawings and the detailed description so that the advantages and features of the invention can be more easily understood by those skilled in the art, and the scope of the invention is more clearly and clearly defined.
The invention relates to a rotatable square secondary air baffle plate, which is characterized in that: the device comprises a square secondary air pipeline 1, a square secondary air nozzle 2, a rotating shaft a3, a rotating shaft b4, a square secondary air baffle a5, a square secondary air baffle b6, a hole a7, a hole b8, a motor a9, a motor b10, a rotating handle a11 and a rotating handle b 12.
As a preferred embodiment of the present invention, as shown in fig. 1 and 2, the rotating shaft a3 and the rotating shaft b4 have the same structure; the structure of the square secondary air baffle a5 is the same as that of the square secondary air baffle b 6; the motor a9 and the motor b10 have the same structure; the structure of the turning handle a11 is the same as that of the turning handle b 12. The dashed arrows in fig. 1 indicate the direction of the secondary air flow, with the width and height directions shown in fig. 2. The height of the square secondary air baffle plate a5 and the square secondary air baffle plate b6 is smaller than the internal height of the square secondary air pipeline 1, the distance between the upper end surface and the lower end surface of the square secondary air baffle plate a5 and the square secondary air baffle plate b6 and the inner wall of the pipeline is about 3mm, and the baffle plates are in clearance fit with the pipeline. Inserting the rotary shaft a3 and the rotary shaft b4 into the square secondary air duct 1 through the hole a7 and the hole b8, respectively; the square secondary air baffle a5 and the rotating shaft a3 are welded in the square secondary air pipeline 1 and ensure that the rotating shaft a3 is sealed with the square secondary air pipeline 1, and the square secondary air baffle b6 and the rotating shaft b4 are welded in the square secondary air pipeline 1 and ensure that the rotating shaft b4 is sealed with the square secondary air pipeline 1. The motor a9 is connected with the rotating shaft a3 and controls the rotation of the rotating shaft a 3; the motor b10 is connected to the rotation shaft b4 to control the rotation of the rotation shaft b4, and the rotation shafts a3 and b4 may be controlled to rotate separately or simultaneously. In the adjusting process of the square secondary air baffle a5 and the square secondary air baffle b6, the two baffles can be adjusted sequentially and simultaneously, and the square secondary air baffle a5 and the square secondary air baffle b6 are preferably adjusted simultaneously, provided that the width of the square secondary air baffle a5 and the width of the square secondary air baffle b6 are less than half of the width of the square secondary air pipeline 1. When the square secondary air baffle a5 and the square secondary air baffle b6 are fully opened, the secondary air nozzle rotates in the opposite direction to the square secondary air nozzle 2 until the secondary air nozzle is tightly attached to the left wall surface and the right wall surface of the square secondary air pipeline 1.
As shown in fig. 3, the rotation axis a3 and the rotation axis b4 are located near the square secondary air nozzle 2, the two sides of the square secondary air duct 1 are provided with holes, the left side and the right side are respectively provided with a hole a7 and a hole b8, the positions of the holes are bilaterally symmetrical, and the distance from the square secondary air nozzle 2 is equal to one tenth of the internal width of the square secondary air duct 1.
As shown in fig. 4 and 5, the square overgrate air baffle a5 and the rotating shaft a3 are welded in the square overgrate air pipeline 1, and the square overgrate air baffle b6 and the rotating shaft b4 are welded in the square overgrate air pipeline 1, so that gaps are reserved between the square overgrate air baffle a5 and the square overgrate air baffle b6 and the upper wall surface and the lower wall surface of the square overgrate air pipeline 1.
As shown in fig. 6 and 7, the rotation shafts a3 and b4 are rotated by controlling the motors a9 and b10, so that the angles of the square secondary air baffle a5 and the square secondary air baffle b6 in the square secondary air pipeline 1 can be changed, and when the secondary air volume is changed, the stability of the air speed of the square secondary air nozzle 2 can be still ensured, and the stability of the central combustion of the hearth can be maintained; the maximum rotation angles of the square secondary air baffle a5 and the square secondary air baffle b6 towards the square secondary air nozzle 2 are that the right end of the square secondary air baffle a5 and the left end of the square secondary air baffle b6 are flush with the square secondary air nozzle 2, and the square secondary air baffle a5 and the square secondary air baffle b6 cannot rotate continuously at the moment so as to prevent the baffles from extending into a hearth to be burnt. Meanwhile, the rotation of the rotating shaft a3 controlled by the motor a9 and the rotation of the rotating shaft b4 controlled by the motor b10 are both performed at the time of low load, so that the wind speed in the square secondary wind pipeline 1 is prevented from being too high at the time of high load, and the square secondary wind baffle a5 and the square secondary wind baffle b6 are prevented from causing large resistance and influencing the rotation.
Fig. 8 shows a design scheme of a determined distance between the position of the opening and the secondary air nozzle 2. The widths of the square secondary air baffle a5 and the square secondary air baffle b6 are related to the required area of the square secondary air nozzle 2; the adjusting scheme is explained by taking the condition that the area of the square secondary air nozzle 2 is adjusted to be half of the original area as an example, and the structure of the baffle plates on two sides is the same, so that the structural schematic diagram of the baffle plate on one side is only shown in the figure. According to the method, when the square secondary air baffle a5 and the square secondary air baffle b6 are fully opened, the area of the square secondary air nozzle 2 is half of the original area, the distance x between the right end of the square secondary air baffle a5 and the left side wall surface of the square secondary air nozzle 2 is determined to be y/4, meanwhile, the inner width y of the square secondary air pipeline 1 and the distance h between the rotating shaft a3 and the position of the square secondary air nozzle 2 are known values, the required width z of the square secondary air baffle a5 can be obtained, the width of the square secondary air baffle b6 can be obtained in the same way, after the angle alpha is obtained, the angle alpha can be used as an adjusting basis for controlling starting and stopping of the motor a9 and the motor b10, and can also be used as an adjusting basis for the rotating handle a11 and the rotating handle b 12. Fig. 8 shows that when the distance h from the rotational axis a3 to the position of the square secondary air nozzle 2 is y/10 and the value x is x1, x2 and x3, the widths of the square secondary air baffle a5 are z1, z2 and z 3. The width z of the square secondary air baffle a5 does not exceed half of the width y of the square secondary air pipeline 1, so that the phenomenon of collision when the square secondary air baffle a5 and the square secondary air baffle b6 are adjusted simultaneously is avoided, and the material of the secondary air baffle can be saved.
As shown in fig. 9, the rotating handle a11 and the rotating handle b12 have the same structure; when the motor fails, the rotation shaft a3 and the rotation shaft b4 may be manually rotated by circumscribing the rotation handle a11 and the rotation handle b12 on the rotation shaft a3 and the rotation shaft b 4.
In conclusion, the square secondary air baffle plate is rotated, so that the area of a secondary air outlet can be changed according to the load of a boiler, the secondary air quantity is low at low load, the area of the secondary air outlet is reduced, the speed of the secondary air is still close to or keeps the wind speed value of the rated load, the secondary air can still be blown to the central position of a hearth, the flame combustion stability at the center of the hearth is ensured, and meanwhile, a design thought is provided for the design of the square secondary air baffle plate.
Claims (10)
1. The utility model provides a rotatable square overgrate air baffle which characterized in that: the secondary air cleaning device comprises a square secondary air pipeline (1), a square secondary air nozzle (2), a rotating shaft a (3), a rotating shaft b (4), a square secondary air baffle a (5), a square secondary air baffle b (6), a hole a (7), a hole b (8), a motor a (9), a motor b (10), a rotating handle a (11) and a rotating handle b (12).
2. A rotatable square overfire air baffle according to claim 1 and further comprising: the rotating shaft a (3) and the rotating shaft b (4) have the same structure; the square secondary air baffle plate a (5) and the square secondary air baffle plate b (6) have the same structure; the structure of the motor a (9) is the same as that of the motor b (10); the structure of the turning handle a (11) and the turning handle b (12) is the same.
3. A rotatable square overfire air baffle according to claim 1 and further comprising: the width of the square secondary air baffle plate a (5) and the width of the square secondary air baffle plate b (6) are the same and are smaller than half of the inner width of the square secondary air pipeline (1); the height of square overgrate air baffle a (5) and square overgrate air baffle b (6) is less than the inside height of square overgrate air pipeline (1), and square overgrate air baffle a (5) and square overgrate air baffle b (6) all are clearance fit with square overgrate air pipeline (1), and the clearance is 3 mm.
4. A rotatable square overfire air baffle according to claim 1 and further comprising: the square secondary air baffle a (5) and the square secondary air baffle b (6) can be arranged on the left side and the right side, and can also be arranged up and down, and the square secondary air baffle a (5) and the square secondary air baffle b (6) are recommended to be arranged on the left side and the right side.
5. A rotatable square overfire air baffle according to claim 1 and further comprising: the rotating shaft a (3) and the rotating shaft b (4) are positioned on two sides of the square secondary air pipeline (1) and near the square secondary air nozzle (2), the left side and the right side of the square secondary air pipeline (1) are respectively provided with a hole a (7) and a hole b (8) which are symmetrical left and right, the hole a (7) corresponds to the rotating shaft a (3), and the hole b (8) corresponds to the rotating shaft b (4); inserting a rotating shaft a (3) and a rotating shaft b (4) into the square secondary air pipeline (1) through a hole a (7) and a hole b (8) respectively; the square secondary air baffle plate a (5) and the rotating shaft a (3) are welded in the square secondary air pipeline (1), and the square secondary air baffle plate b (6) and the rotating shaft b (4) are welded in the square secondary air pipeline (1).
6. A rotatable square overfire air baffle according to claim 1 and further comprising: the motor a (9) is connected with the rotating shaft a (3) and controls the rotation of the rotating shaft a (3); the motor b (10) is connected to the rotating shaft b (4) and controls the rotation of the rotating shaft b (4).
7. A rotatable square overfire air baffle according to claim 1 and further comprising: the rotation axis a (3) and the rotation axis b (4) can also be adjusted manually by rotating the handle a (11) and the handle b (12).
8. A rotatable square overfire air baffle according to claim 1 and further comprising: the distance between the opening positions of the hole a (7) and the hole b (8) and the square secondary air nozzle (2) is equal to one tenth of the internal width of the square secondary air pipeline (1), and the widths of the square secondary air baffle plate a (5) and the square secondary air baffle plate b (6) are respectively determined by combining the area of the required square secondary air nozzle (2).
9. A rotatable square overfire air baffle according to claim 1 and further comprising: the rotation of the rotating shaft a (3) controlled by the motor a (9) and the rotation of the rotating shaft b (4) controlled by the motor b (10) are both carried out at low load, the two baffles can be adjusted sequentially or simultaneously in the adjusting process of the square secondary air baffle a (5) and the square secondary air baffle b (6), and the square secondary air baffle a (5) and the square secondary air baffle b (6) are preferably adjusted simultaneously.
10. A rotatable square overfire air baffle according to claim 1 and further comprising: the square secondary air baffle plate a (5) and the square secondary air baffle plate b (6) are attached to the secondary air duct in the opposite direction of the square secondary air nozzle (2) when the unit is fully loaded; the maximum rotation angles of the square secondary air baffle plate a (5) and the square secondary air baffle plate b (6) towards the square secondary air nozzle (2) are that the right end of the square secondary air baffle plate a (5) and the left end of the square secondary air baffle plate b (6) are aligned with the square secondary air nozzle (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110286276.0A CN113251433A (en) | 2021-03-17 | 2021-03-17 | Rotatable square overgrate air baffle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110286276.0A CN113251433A (en) | 2021-03-17 | 2021-03-17 | Rotatable square overgrate air baffle |
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| CN113251433A true CN113251433A (en) | 2021-08-13 |
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