CN213942398U - Airflow uniform distribution device suitable for variable working conditions - Google Patents
Airflow uniform distribution device suitable for variable working conditions Download PDFInfo
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- CN213942398U CN213942398U CN202022945236.6U CN202022945236U CN213942398U CN 213942398 U CN213942398 U CN 213942398U CN 202022945236 U CN202022945236 U CN 202022945236U CN 213942398 U CN213942398 U CN 213942398U
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Abstract
The utility model discloses an air current equipartition device suitable for under variable operating mode, include: the flow equalizing device is of a conical hollow structure, the smaller end of the flow equalizing device is an airflow inlet, and the larger end of the flow equalizing device is an airflow outlet; the first layer of distribution plate is of a plate structure, a plurality of through holes are uniformly formed in the first layer of distribution plate, the top end of the first layer of distribution plate is fixedly arranged in the flow equalizing device and close to the airflow inlet, and a gap is reserved between the bottom end of the first layer of distribution plate and the inner wall of the flow equalizing device; the third layer of distribution plate is of a plate structure, a plurality of through holes are uniformly formed in the third layer of distribution plate, the top end of the third layer of distribution plate is fixedly arranged in the flow equalizing device and close to the airflow outlet, and a gap is reserved between the bottom end of the third layer of distribution plate and the inner wall of the flow equalizing device; one or two adjustable distribution plates are arranged between the first layer distribution plate and the third layer distribution plate at intervals. The problem of current air current equipartition device air current equipartition effect is relatively poor under partial load operating mode is solved.
Description
Technical Field
The utility model belongs to the technical field of the flue gas dust removal, concretely relates to air current equipartition device suitable for under the variable operating mode.
Background
When flue gas to be treated in a coal-fired power plant enters a dust remover, the flue gas needs to be transited from a ventilation flue with a small section to a dust remover working area with a large section, and due to the sudden change of a circulation section, the airflow is subjected to flow removal, vortex and backflow, so that the airflow entering the dust remover working area is extremely uneven in distribution, and the smoke dust collecting effect is seriously influenced. At present, the solution applied in engineering is to install multiple layers of porous plates in fixed positions in the airflow uniform distribution device, wherein the aperture ratio of each layer of porous plate is fixed, the aperture ratio of the porous plate is set under the condition of flue gas parameters when the dust remover is fully loaded, namely, the flow equalizing device has the best airflow uniform distribution effect when the flue gas is fully loaded. However, when the flue gas flow changes greatly, the gas flow distribution effect is poor under the partial load working condition because the aperture ratio of the original distribution plate cannot be adjusted, and the gas flow distribution entering the working area of the dust remover cannot meet the design requirements.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an air current equipartition device suitable for under the variable operating mode to solve the relatively poor problem of air current equipartition effect of current air current equipartition device under the partial load operating mode.
The utility model adopts the following technical scheme: the utility model provides an air current equipartition device suitable for under the variable operating mode, includes:
the flow equalizing device is of a conical hollow structure, the smaller end of the flow equalizing device is an airflow inlet, and the larger end of the flow equalizing device is an airflow outlet;
the first layer of distribution plate is of a plate structure, a plurality of through holes are uniformly formed in the first layer of distribution plate, the top end of the first layer of distribution plate is fixedly arranged in the flow equalizing device and close to the airflow inlet, and a gap is reserved between the bottom end of the first layer of distribution plate and the inner wall of the flow equalizing device;
the third layer of distribution plate is of a plate structure, a plurality of through holes are uniformly formed in the third layer of distribution plate, the top end of the third layer of distribution plate is fixedly arranged in the flow equalizing device and close to the airflow outlet, and a gap is reserved between the bottom end of the third layer of distribution plate and the inner wall of the flow equalizing device;
one or two adjustable distributing plates, the interval sets up between first layer distributing plate and third layer distributing plate, and the structure of every adjustable distributing plate specifically is:
the connecting rod is vertically arranged, and one end of the connecting rod is connected with the power assembly and is used for driving the connecting rod to reciprocate up and down;
the main shafts are arranged in parallel and at intervals, and two ends of each main shaft are suspended and erected through bearings;
one end of each connecting frame is fixedly connected with the outer wall of the end part of one of the main shafts, and the other end of each connecting frame is hinged to the connecting rod;
the blades are of flat plate structures comprising a plurality of through holes, and one side of each blade is fixedly connected to one side of each main shaft;
the connecting rod is used for driving each connecting frame to move through the self up-and-down reciprocating movement of the connecting rod so as to realize the rotation of the main shaft and further realize the closing and opening of the blades.
Furthermore, the adjustable distribution plate further comprises a first supporting plate and a second supporting plate which are vertical and arranged at intervals, one end of the main shaft is installed on the first supporting plate through a first bearing seat, and the other end of the main shaft is installed on the second supporting plate through a second bearing seat.
Furthermore, two sides of the main shaft are respectively connected with two blades, and the two blades are positioned in the same plane.
Furthermore, the leeward sides of the first layer of distribution plate and the third layer of distribution plate are provided with support pipes.
Furthermore, gaps of 50-100mm are reserved between the first layer of distribution plate, the adjustable distribution plate and the third layer of distribution plate and the bottom wall plate of the flow equalizing device.
The utility model has the advantages that: one or more layers of adjustable distribution plates are added in the flow equalizing device, and the opening or closing state of the blade distribution plates is flexibly adjusted according to the change condition of the flue gas load, so that the uniform distribution effect of the airflow of the flow equalizing device in variable working condition operation is ensured, and the dust removal effect is improved; the blades are of a porous structure, so that the flow equalization and the flow guidance of smoke can be realized simultaneously in the blade angle adjusting process, and in addition, the smoke dust on the blades can be cleaned; a certain distance is reserved between the bottom end of each layer of multi-distribution plate and the bottom wall plate of the flow equalizing device, so that the smoke dust-containing particles are prevented from being accumulated and blocked on the bottom wall plate.
Drawings
FIG. 1 is a schematic structural view of the adjustable airflow uniform distribution device of the present invention;
FIG. 2 is a schematic structural view of the blades of the adjustable airflow distribution device in a closed state;
FIG. 3 is a cross-sectional view B-B of FIG. 2;
fig. 4 is a schematic diagram of a double-blade structure of the airflow uniform distribution device suitable for a variable working condition of the present invention;
fig. 5 is a schematic structural view of the double-blade of the airflow uniform distribution device suitable for the variable working condition of the present invention in the open state;
fig. 6 is the utility model discloses a single blade of air current equipartition device under variable operating mode is in open mode structure schematic diagram
In the figure, the distribution plate comprises a first layer of distribution plate 1, a second layer of distribution plate 2, an adjustable distribution plate 3, a third layer of distribution plate 4, a flow equalizing device 5, a first bearing seat 6, a first supporting plate 7, a blade 8, a main shaft 9, a second bearing seat 10, a coupler 11, a connecting rod 12, a connecting rod 13, a second supporting plate 14 and a power assembly.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model provides an air current equipartition device suitable for under the variable operating mode, as shown in figure 1, including flow straightener 4, first layer distributing plate 1, third layer distributing plate 3 and one or two adjustable distributing plate 2. The first layer of distribution plate 1 and the second layer of distribution plate 3 are fixed whole plate type structures and are formed by one or more groups of small blocks in a welding mode, and the adjustable distribution plate 2 is positioned between the distribution plate 1 and the distribution plate 3; wherein the number of layers of the adjustable distribution plate 2 may be 1, 2 or 3. The aperture ratio of the first layer of distribution plate 1 and the second layer of distribution plate 3 is calculated and designed under the condition of 1/3 of full load of flue gas; the aperture ratio of the adjustable distribution plate 2 is calculated and designed under the condition of full load of the flue gas.
A plurality of layers of distribution plates are hung on the inner side of the bell-mouth-shaped flow equalizing device 4, and the tops of the distribution plates are fixed in the flow equalizing device 4 through bolts. The shape of the open pore of each layer of distribution plate can be round hole or square hole, and the horizontal distance between two adjacent layers of distribution plates is more than 10 times of the equivalent diameter of the open pore. A gap of 50-100mm is reserved between the bottom end of each layer of distribution plate and the bottom wall plate of the flow equalizing device, so that the accumulation of smoke dust particles is prevented. Supporting pipes are arranged on the leeward sides of the first layer of distribution plate 1 and the third layer of distribution plate 3, so that the distribution plates are prevented from being damaged due to overhigh flue gas flow velocity; when the size and specification of the flow equalizing device are larger, the first layer distribution plate 1 and the third layer distribution plate 3 can be formed by welding in a split mode, and the thickness of the distribution plates is 3-5mm stainless steel. The aperture ratio of the third layer of distribution plate 3 is smaller than that of the first layer of distribution plate 1.
The aperture ratio of the first layer of distribution plate 1 and the third layer of distribution plate 3 is calculated and designed under the condition of 1/3 of full load of flue gas; the aperture ratio of the adjustable distribution plate 2 is calculated and designed under the condition of full load of the flue gas.
The flow equalizing device 4 is a conical hollow structure, the smaller end of the flow equalizing device is an airflow inlet, and the larger end of the flow equalizing device is an airflow outlet. The first layer of distribution plate 1 is a plate structure, a plurality of through holes are uniformly arranged on the first layer of distribution plate, the top end of the first layer of distribution plate is fixedly arranged in the flow equalizing device 4 and is close to the airflow inlet, and a gap is reserved between the bottom end of the first layer of distribution plate and the inner wall of the flow equalizing device 4. The third layer of distribution plate 3 is a plate-type structure, a plurality of through holes are uniformly arranged on the third layer of distribution plate, the top end of the third layer of distribution plate is fixedly arranged in the flow equalizing device 4 and is close to the airflow outlet, and a gap is reserved between the bottom end of the third layer of distribution plate and the inner wall of the flow equalizing device 4. One or two adjustable distribution plates 2 are arranged between the first layer distribution plate 1 and the third layer distribution plate 3 at intervals.
As shown in fig. 2, the structure of each adjustable distribution plate 2 includes a connecting rod 12, a power assembly 14, a main shaft 8 and a blade 7. The method specifically comprises the following steps: a connecting rod 12 is vertically arranged, one end of the connecting rod 12 is connected with a power assembly 14, and the power assembly 14 is used for driving the connecting rod 12 to move up and down in a reciprocating mode. The power assembly 14 may be pneumatically, hydraulically, or electrically driven. The power assembly provides a power source and drives the pull rod to operate and drive the blades to rotate so as to realize the adjustment of air flow distribution. A plurality of main shafts 8 are arranged in parallel and at intervals, and two ends of each main shaft 8 are suspended and erected through bearings. Each group of main shafts 8 can be provided with a plurality of groups of bearing seat supports in the wall plate of the flow equalizing device 4 according to the length so as to prevent the main shafts from bending deformation caused by long-time and large-span operation. As shown in fig. 3, a plurality of connecting frames 11 are provided, one end of each connecting frame 11 is fixedly connected with the outer wall of the end part of one of the main shafts 8, and the other end of each connecting frame 11 is hinged to the connecting rod 12. The number of the connecting frames 11 is the same as the number of the spindles 8. One side of each main shaft 8 is fixedly connected with a blade 7, each blade 7 is of a flat plate structure comprising a plurality of through holes, and round holes with the diameter of 50-80mm are uniformly formed in the porous blades 7. The connecting rod 12 is used for reciprocating up and down through the connecting rod 12, the connecting frame 11 moves up and down under the pulling of the connecting rod 12 and simultaneously transmits an external force which enables the main shaft 8 to rotate, and then the main shaft 8 is driven to rotate through the movement of the connecting rod 12, so that the blades 7 are closed and opened.
In some embodiments, the adjustable distribution plate 2 further includes a first support plate 6 and a second support plate 13, which are vertically and spaced apart from each other, one end of the main shaft 8 is mounted on the first support plate 6 through a first bearing seat 5, and the other end of the main shaft 8 is mounted on the second support plate 13 through a second bearing seat 9. The blade distribution plate assemblies are uniformly connected in parallel on the first support plate 6 and the second support plate 13. First backup pad 6 and second backup pad 13 all are located the flow straightener 4 outside, and main shaft 8 is equipped with the sealing member with flow straightener 4's wallboard junction in order to prevent that the flue gas from leaking.
The blade distribution plate may be a single blade 7, and in some embodiments, may also be a double blade 7 structure. As shown in fig. 4, two blades 7 are respectively connected to two sides of the main shaft 8, and the two blades 7 are located in the same plane. When the size of the flow equalizing device is larger, the blades 7 in the double-blade distribution plate can be spliced and welded in sections. The angle at which the double vanes open is maximized to achieve a horizontal position, as shown in fig. 5. The aperture ratio of the blade 7 is calculated and designed under the full-load condition of the smoke.
The utility model relates to an air current equipartition device's working process suitable for under variable operating mode does:
when the flue gas runs at full load, the power assembly 14 works to drive the connecting rod 12, the connecting rod 11 and the main shaft 8 to rotate in sequence, the adjustable distribution plate 2 is in a closed state, and each group of blades is perpendicular to the incoming flow direction of the flue gas, namely, each group of blades are connected in sequence. The smoke enters from the small opening end of the flow equalizing device, and the resistance is increased after passing through each layer of porous distribution plate, so that large-scale airflow in front of the porous distribution plate is divided into small-scale turbulence, and the airflow direction is perpendicular to the distribution plate. Finally, the flue gas reaches the effect of uniform distribution of air flow after passing through the first layer of distribution plate 1, the adjustable distribution plate 2 and the third layer of distribution plate 3. In the process, the adjustable distribution plate 2 plays a role of flow equalization.
As shown in fig. 5-6, when the flue gas runs with partial load, the power assembly 14 drives the main shaft 8 to rotate, the adjustable distribution plate 2 is in an open state, the opening angle of the blades 7 is adjustable, and the blades 7 can be parallel to each other to the maximum extent, that is, the blades are parallel to the incoming flow direction of the flue gas. At the moment, the flue gas can achieve the effect of uniform distribution of air flow after passing through the first layer of distribution plate 1 and the third layer of distribution plate 3. In the process, the adjustable distribution plate 2 plays a role in guiding and guiding the oblique airflow of the original flue gas to a direction perpendicular to the third layer of distribution plate 3, so that the uniform airflow distribution effect of the subsequent layer of porous distribution plate is improved.
The utility model discloses an air flow uniform distribution device suitable for under variable operating mode is through adding one deck or multilayer adjustable distributing plate in flow straightener 4, according to the flue gas load change condition, the flexible open or closed state of adjustment blade distributing plate to guarantee the air flow uniform distribution effect of this flow straightener when variable operating mode, improve the dust removal effect; the blades are of a porous structure, so that the flow equalization and the flow guidance of smoke can be realized simultaneously in the blade angle adjusting process, and in addition, the smoke dust on the blades can be cleaned; a certain distance is reserved between the bottom end of each layer of multi-distribution plate and the bottom wall plate of the flow equalizing device, so that the smoke dust-containing particles are prevented from being accumulated and blocked on the bottom wall plate. The device can flexibly adjust the angle of the distribution plate according to the change condition of the inlet flue gas load, so that the air flow distribution meets the design requirement.
Claims (5)
1. The utility model provides an air current equipartition device suitable for under the variable operating mode which characterized in that includes:
the flow equalizing device (4) is of a conical hollow structure, the smaller end of the flow equalizing device is an airflow inlet, and the larger end of the flow equalizing device is an airflow outlet;
the first layer of distribution plate (1) is of a plate-type structure, a plurality of through holes are uniformly formed in the first layer of distribution plate, the top end of the first layer of distribution plate is fixedly arranged in the flow equalizing device (4) and close to an airflow inlet, and a gap is reserved between the bottom end of the first layer of distribution plate and the inner wall of the flow equalizing device (4);
the third layer of distribution plate (3) is of a plate type structure, a plurality of through holes are uniformly formed in the third layer of distribution plate, the top end of the third layer of distribution plate is fixedly arranged in the flow equalizing device (4) and close to the airflow outlet, and a gap is reserved between the bottom end of the third layer of distribution plate and the inner wall of the flow equalizing device (4);
one or two adjustable distributing plates (2) are arranged between the first layer distributing plate (1) and the third layer distributing plate (3) at intervals, and the structure of each adjustable distributing plate (2) is specifically as follows:
the connecting rod (12) is vertically arranged, and one end of the connecting rod is connected with a power assembly (14) for driving the connecting rod (12) to reciprocate up and down;
a plurality of main shafts (8) are arranged in parallel and at intervals, and two ends of each main shaft are suspended and erected through bearings;
one end of each connecting frame (11) is fixedly connected with the outer wall of the end part of one main shaft (8), and the other end of each connecting frame (11) is hinged to the connecting rod (12);
the blades (7) are of flat plate structures with a plurality of through holes, and one side of each blade (7) is fixedly connected to one side of each main shaft (8);
the connecting rods (12) are used for driving the connecting frames (11) to move through the self up-and-down reciprocating movement of the connecting rods so as to realize the rotation of the main shaft (8) and further realize the closing and opening of the blades (7).
2. The device for distributing airflow evenly under variable working conditions as claimed in claim 1, wherein the adjustable distribution plate (2) further comprises a first support plate (6) and a second support plate (13) which are vertically arranged at intervals, one end of the main shaft (8) is mounted on the first support plate (6) through a first bearing seat (5), and the other end of the main shaft (8) is mounted on the second support plate (13) through a second bearing seat (9).
3. The device for distributing the air flow under the variable working conditions as claimed in claim 1 or 2, wherein two blades (7) are respectively connected to two sides of the main shaft (8), and the two blades (7) are located in the same plane.
4. A device for distributing airflow evenly under variable working conditions as claimed in claim 1 or 2, wherein the leeward side of the first layer distribution plate (1) and the third layer distribution plate (3) are provided with support pipes.
5. The device for distributing airflow evenly under variable working conditions as claimed in claim 1 or 2, wherein a gap of 50-100mm is left between the first layer distribution plate (1), the adjustable distribution plate (2) and the third layer distribution plate (3) and the bottom wall plate of the flow equalizing device (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022945236.6U CN213942398U (en) | 2020-12-10 | 2020-12-10 | Airflow uniform distribution device suitable for variable working conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022945236.6U CN213942398U (en) | 2020-12-10 | 2020-12-10 | Airflow uniform distribution device suitable for variable working conditions |
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| Publication Number | Publication Date |
|---|---|
| CN213942398U true CN213942398U (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022945236.6U Active CN213942398U (en) | 2020-12-10 | 2020-12-10 | Airflow uniform distribution device suitable for variable working conditions |
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|---|---|
| CN (1) | CN213942398U (en) |
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- 2020-12-10 CN CN202022945236.6U patent/CN213942398U/en active Active
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