A dry electrostatic precipitator with multi-zone coupling and high-efficiency dust removal

Abstract

The present invention discloses a multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator, the dry-type electrostatic precipitator comprises an inlet horn, a cover body and an outlet horn, a plurality of electric fields are sequentially arranged inside the cover body, an anode plate and a cathode wire are arranged inside each electric field, dust collecting grids are arranged inside the inlet horn and the outlet horn, the dust collecting grids are formed by evenly arranged multiple groups of bent grids, multiple groups of bent grids are arranged along the flue gas direction, and the upper and lower ends of each group of grids are installed in the inlet horn and the outlet horn through a vibrating frame. The multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator of the present invention optimizes the existing electrode plates, electrode wires, inlet and outlet horn smoke boxes, flow fields and other aspects of the electrostatic precipitator, which can improve the capture efficiency of smoke, reduce secondary dust, and further reduce the smoke concentration at the outlet of the electrostatic precipitator; the multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator of the present invention has low investment, does not occupy space or occupies a small space, has low resistance, low energy consumption, and significant efficiency improvement effect.

Description

Technical field:

[0001] The invention belongs to the technical field of dry electrostatic dust removal, and in particular relates to a dry electrostatic precipitator with multi-zone coupling and high-efficiency dust removal. Background technology:

[0002] In the ultra-low emission transformation of smoke dust, comprehensive measures are generally taken through wet desulfurization flue gas installation of wet electrostatic precipitator, integrated desulfurization and dust removal technology transformation, and electrostatic precipitator efficiency improvement, so that the smoke dust emission mass concentration can finally meet the ultra-low emission limit requirements.

[0003] In recent years, fires in wet electrostatic precipitators have occurred frequently due to problems with materials and construction management. At the same time, some wet electrostatic precipitators do not operate well due to design defects, high operating power consumption, and overly complex environmental protection systems.

[0004] Although the integrated desulfurization and dust removal technology can achieve efficient dust removal, it has poor load adaptability, and the dust concentration at the desulfurization inlet and outlet (i.e., the outlet of the electrostatic precipitator) cannot be too high. In order to improve the quality of gypsum, improve the desulfurization efficiency and system stability, it is very necessary to further reduce the dust concentration at the outlet of the electrostatic precipitator. Moreover, the integrated desulfurization and dust removal technology transformation and the wet electrostatic precipitator transformation both require an additional set of equipment on the basis of the original environmental protection facilities. The system is relatively complex, the maintenance workload is large, the transformation period is long, the land area is large, and the investment and operating costs are high.

[0005] At present, there are three main types of efficiency improvement technologies for existing electrostatic precipitators:

[0006] The first category is conventional capacity expansion (such as increasing the height of the plate, increasing the electric field, and changing the side vibration to the top vibration);

[0007] Category 2: Power supply modification (high frequency power supply, pulse power supply, etc.);

[0008] The third category includes auxiliary efficiency-enhancing technologies such as low-temperature electrostatic precipitator and electromechanical dual-zone.

[0009] Among them, the existing conventional capacity expansion and low-temperature electrostatic precipitator, electromechanical dual zone and other auxiliary efficiency-enhancing technologies all have many problems such as high investment cost, large floor space, high operating cost, and complex system; while the power supply transformation technology has a moderate investment cost, but the dust removal efficiency-enhancing effect is relatively unobvious. At the same time, the guide plate, air distribution plate and porous plate set in the trumpet smoke box of the dry electrostatic precipitator have great obstacles to the flow of flue gas, and the pre-dust removal and dust removal effects are not obvious, and the investment price and operation and maintenance costs are high. Summary of the invention:

[0010] In view of the problems in the prior art, the present invention provides a multi-zone coupled high-efficiency dust removal dry electrostatic precipitator, and its technical solution is as follows:

[0011] A multi-zone coupled high-efficiency dust removal dry electrostatic precipitator, the dry electrostatic precipitator comprises an inlet horn, a cover body and an outlet horn, a plurality of electric fields are sequentially arranged inside the cover body, an anode plate and a cathode line are arranged in each electric field, dust collecting grids are arranged inside the inlet horn and the outlet horn, the dust collecting grids are formed by evenly arranged multiple groups of bent grids, the multiple groups of bent grids are arranged along the direction of flue gas, and the upper and lower ends of each group of grids are installed in the inlet horn and the outlet horn through a vibration frame.

[0012] Preferably, the bent grille adopts a V-shaped structure bent at least once;

[0013] Preferably, the outlet horn is bent once to form a V-shaped cross-section structure; the grille bent inside the inlet horn is bent twice to form a W-shaped or M-shaped cross-section structure.

[0014] Preferably, the dust collecting grid is divided into 8 to 12 columns by partitions, each column is provided with 3 groups of bent grids, each column is provided with a rapping frame and is respectively equipped with a rapper.

[0015] Preferably, a plurality of groups of the dust collecting grids are arranged at intervals inside the inlet horn and the outlet horn.

[0016] Preferably, the interval ranges from 100 mm to 200 mm.

[0017] Preferably, three groups of dust collecting grilles are arranged at intervals in the middle section of the inlet horn, and each group of dust collecting grilles is adapted to be installed with the inlet horn; three groups of dust collecting grilles are arranged at intervals at the entrance of the outlet horn, and each group of dust collecting grilles has a similar outer size and is adapted to the inner diameter of the installation position closest to the outlet of the outlet horn.

[0018] Preferably, the bent grille adopts a bent porous curved panel structure, wherein the porous curved panel includes a plurality of curved surface monomers, the curved surface monomers include a first folding plate and a second folding plate, the first folding plate and the second folding plate are both provided with two folding arms, the lower end of the first folding arm is connected to the upper end of the second folding arm, the two are staggered and connected up and down to form a nearly parallelogram connecting surface, and a deflection hole is formed in the middle of the curved surface monomer; each curved surface monomer is connected in sequence up and down and left and right; in the two curved surface monomers adjacent to each other, the second folding plate of the upper curved surface monomer is connected to the first folding plate of the lower curved surface monomer through the bending part; in the two curved surface monomers adjacent to each other on the left and right, the first folding plates of the two curved surface monomers are connected to each other, and the second folding plates are connected to each other; a plurality of curved surface monomers are integrally connected to form a porous curved panel, which has a homogenizing effect on the airflow passing through the deflection hole.

[0019] Preferably, at least one layer of porous curved plate is provided in the gap between adjacent electric fields.

[0020] Preferably, in adjacent electric fields, a porous curved plate is used as an anode plate in the front electric field, and a porous curved plate is arranged between adjacent cathode lines in the rear electric field.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator of the present invention optimizes the existing electrode plates, electrode lines, inlet and outlet horn smoke boxes, flow fields and other aspects of the electrostatic precipitator, which can improve the capture efficiency of smoke, reduce secondary dust, and further reduce the smoke concentration at the outlet of the electrostatic precipitator; the multi-zone coupled high-efficiency dust removal dry-type electrostatic precipitator of the present invention requires low investment, occupies no land or occupies a small amount of land, has low resistance, low energy consumption, and significant efficiency improvement effect.

[0023] The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator of the present invention has multiple layers of porous curved grilles inside the inlet horn and the outlet horn, which effectively improves the dust collection efficiency of the dry electrostatic precipitator.

[0024] The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator of the present invention can couple the porous curved plate to the anode plate and the cathode line in the electric field inside the cover body according to different application positions, so as to enhance the dust removal capacity of each area of ​​the electrostatic precipitator, optimize the flow field, and increase the overall specific dust collection area. It can be designed based on the actual situation of the original electrostatic precipitator shell, is flexible and changeable, and is suitable for improving the efficiency of the existing stock units of electrostatic precipitators.

[0025] The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator of the present invention also divides the cross-section of the inlet horn and the outlet horn into multiple columns of partitions, each column of the partition is respectively provided with a multi-layer porous curved panel structure, and each column of the partition is individually provided with a vibrator, and the vibrator is connected to a controller to realize timed vibration in the partitions, thereby significantly improving the dust prevention effect.

[0026] The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator of the present invention can improve the flue gas airflow distribution, increase the dust collection area of ​​the electrostatic precipitator, reduce dust entrainment, and improve the utilization rate of the dust collector shell, ultimately effectively improving the dust collection efficiency of the dust collector as a whole.

[0027] The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator of the present invention is flexible and simple, and is particularly suitable for the transformation of an electrostatic precipitator with a relatively small electric field number and a relatively small dust collection area. Description of the drawings:

[0028] Figure 1 It is a schematic diagram of the overall structure of the dry electrostatic precipitator in the embodiment;

[0029] Figure 2 It is a top view schematic diagram of a dry-type electrostatic precipitator in the embodiment;

[0030] Figure 3 It is a top view of the imported speaker in the embodiment;

[0031] Figure 4 This is a schematic diagram of the imported speaker structure in the embodiment;

[0032] Figure 5 for Figure 4 A magnified view of the layout;

[0033] Figure 6 A top view of an outlet speaker in an embodiment;

[0034] Figure 7 This is a schematic diagram of the structure of the outlet speaker in the embodiment;

[0035] Figure 8 for Figure 7 A magnified view of the layout;

[0036] Fig. 9 A schematic top view of a single partition of the dust collecting grille inside the outlet speaker in the embodiment;

[0037] Fig.10 A schematic top view of a single partition of the dust collecting grille inside the inlet speaker in the embodiment;

[0038] Fig.11 Schematic diagram of the three-dimensional structure of the porous curved panel in the embodiment;

[0039] Fig.12 It is a schematic diagram of the structure of the curved surface monomer in the embodiment;

[0040] Fig.13 is a front view of a porous curved panel in an embodiment;

[0041] In the figure, 1-curved surface monomer; 2-baffle hole; 3-first folded plate; 31-first tip; 4-second folded plate; 41-second tip; 5-external structural frame; 6-inlet horn; 7-outlet horn; 8-dust collecting grid; 91-first electric field; 92-second electric field; 93-third electric field; 94-final electric field; 10-gap; 11-cathode line; 12-anode plate; 13-grid; 14-rapper. Specific implementation method:

[0042] The present invention will be further described below in conjunction with the accompanying drawings.

[0043] Embodiment 1:

[0044] The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator of the present invention is as follows: Figures 1 to 8As shown, the dry electrostatic precipitator includes an inlet horn 6, a cover body and an outlet horn 7. A first electric field 91, a second electric field 92, a third electric field 93 and a final electric field 94 are arranged in sequence inside the cover body. An anode plate 12 and a cathode line 11 are arranged in each electric field. Dust collecting grids 8 are arranged inside the inlet horn 6 and the outlet horn 7. Each group of dust collecting grids 8 is composed of multiple groups of bent grids 13 evenly arranged. The multiple groups of bent grids 13 are arranged along the direction of the flue gas. The upper and lower ends of each group of grids 13 are installed in the inlet horn 6 and the outlet horn 7 through a vibration frame.

[0045] Embodiment 2:

[0046] A further design of this embodiment is that: the bent grid in this embodiment adopts a V-shaped structure bent at least once; wherein, Fig. 9 As shown, the outlet horn is bent once to form a V-shaped cross-section structure; Fig.10 As shown, the grille bent inside the inlet horn is bent twice to form a W-shaped or M-shaped cross-section. The above design strengthens the flue gas diversion effect, ensures that the flue gas flows along the curve, and contacts the porous curved grille multiple times, thereby improving the collision dust collection effect.

[0047] Embodiment three:

[0048] The further design of this embodiment is that: in this embodiment, the dust collecting grid is divided into 8 to 12 columns by the partition plate, such as Fig. 9 As shown, three groups of bent grilles are arranged in each partition column, and each partition column is provided with a rapping frame and is respectively equipped with a rapper. This design realizes staggered rapping of the dry electrostatic precipitator, reduces dust raised by rapping of the precipitator, effectively improves the dust collection efficiency of the dry electrostatic precipitator, and reduces dust escape during rapping of the final electric field of the electrostatic precipitator.

[0049] Embodiment 4:

[0050] A further design of this embodiment is that a plurality of groups of dust collecting grids are arranged inside the inlet horn and the outlet horn at intervals, with the intervals ranging from 100 mm to 200 mm.

[0051] Embodiment five:

[0052] The optional design of this embodiment is that in this example, three groups of dust collecting grids are arranged at intervals in the middle section of the inlet horn for pre-dust removal, flow diversion, and air distribution, and can promote uniform distribution of the gas entering the dust collector. Each group of dust collecting grids is installed in conjunction with the inlet horn to achieve full cross-section coverage and enhance the effect on the flue gas airflow distribution.

[0053] Embodiment six:

[0054] An optional design of this embodiment is that in this example, two groups of outlet horns of the electrostatic precipitator are provided, and three groups of dust collecting grids are arranged at intervals at the inlet of the outlet horn. The outer dimensions of each group of dust collecting grids are similar and matched with the inner diameter of the installation position closest to the outlet of the outlet horn.

[0055] Embodiment seven:

[0056] The further design of this embodiment is that the bent grid in this embodiment adopts a bent porous curved panel structure, such as Figure 11 to Figure 13 As shown, the porous curved plate includes a plurality of curved surface monomers 1, and the curved surface monomer 1 includes a first folding plate 3 and a second folding plate 4. The first folding plate 3 and the second folding plate 4 have the same structure and are both provided with two folding arms. The bending angle of the folding arms ranges from 30° to 150° (145° in this example). The bending parts of the first folding plate and the second folding plate both form tips, wherein the bending part of the first folding plate forms a first tip, and the bending part of the second folding plate forms a second tip. Both the first tip and the second tip can be used as discharge electrodes. Among them, the lower end of the first folding arm of the first folding plate and the second folding plate is connected to the upper end of the second folding arm, and the two are staggered up and down to form a nearly parallelogram connection surface, and a deflection hole 2 is formed in the middle of the curved surface monomer; the surface of the first folding plate 3 and the second folding plate 4 is a smooth curved surface structure, which reduces the airflow resistance through the porous curved plate.

[0057] Each curved surface monomer is connected in sequence up and down and left and right; in the two curved surface monomers adjacent to each other, the second folded plate of the upper curved surface monomer is connected to the first folded plate of the lower curved surface monomer through a bend; in the two curved surface monomers adjacent to each other on the left and right, the first folded plates of the two curved surface monomers are connected to each other, and the second folded plates are connected to each other; a plurality of curved surface monomers are connected in an integrated manner to form a porous curved plate, which has a homogenizing effect on the airflow flowing through the deflection holes. An external structural frame 5 is provided on the periphery of the porous curved plate.

[0058] The porous curved panel is made of 304 stainless steel plate by cutting, stretching or combining and connecting. The specific production process is as follows:

[0059] The 304 steel plate is rolled out with holes through the rolling mill, and at the same time, it is stretched to both sides along the vertical direction of the 304 steel plate, and the flat plates on both sides of the hole are stretched and deformed into curved surfaces. The mill arranges turning tools at intervals so that the next row of holes and the previous row of holes in the rolled holes are offset.

[0060] Embodiment eight:

[0061] A further design of this embodiment is that at least one layer of porous curved plate is provided in the gap 10 between adjacent electric fields.

[0062] Embodiment nine:

[0063] A further design of this embodiment is that in adjacent electric fields, a porous curved plate is used as an anode plate in the front electric field, and a porous curved plate is arranged between adjacent cathode lines in the rear electric field.

Claims

1. A multi-zone coupled high-efficiency dry electrostatic precipitator, the dry electrostatic precipitator comprising an inlet horn, a cover body and an outlet horn, a plurality of electric fields are sequentially arranged inside the cover body, and an anode plate and a cathode line are arranged in each electric field, characterized in that: Dust collecting grids are arranged inside the inlet horn and the outlet horn. The dust collecting grids are formed by evenly arranged multiple groups of bent grids. The multiple groups of bent grids are arranged along the direction of the flue gas. The upper and lower ends of each group of grids are installed in the inlet horn and the outlet horn through a vibration frame. The bent grille adopts a bent porous curved panel structure, wherein the porous curved panel includes a plurality of curved surface monomers, the curved surface monomers include a first folding plate and a second folding plate, the first folding plate and the second folding plate are both provided with two folding arms, the lower end of the first folding arm is connected to the upper end of the second folding arm, the two are staggered up and down and connected to form a nearly parallelogram connection surface, and a deflection hole is formed in the middle of the curved surface monomer; each curved surface monomer is connected in sequence up and down and left and right; in the two curved surface monomers adjacent to each other, the second folding plate of the upper curved surface monomer is connected to the first folding plate of the lower curved surface monomer through a bending part; in the two curved surface monomers adjacent to each other on the left and right, the first folding plates of the two curved surface monomers are connected to each other, and the second folding plates are connected to each other; a plurality of curved surface monomers are connected in an integrated manner to form a porous curved panel, which has a homogenizing effect on the airflow flowing through the deflection hole; The outlet horn is bent once to form a structure with a V-shaped cross section; the bent grille inside the inlet horn is bent twice to form a structure with a W-shaped or M-shaped cross section; three groups of dust collecting grilles are arranged at intervals in the middle section of the inlet horn, and each group of dust collecting grilles is adapted to be installed with the inlet horn; three groups of dust collecting grilles are arranged at intervals at the entrance of the outlet horn, and each group of dust collecting grilles has a similar outer size and is adapted to the inner diameter of the installation position closest to the outlet of the outlet horn.

2. The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator according to claim 1 is characterized in that: The bent grid adopts a V-shaped structure bent at least once.

3. The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator according to claim 2 is characterized in that: The dust collecting grid is divided into 8 to 12 columns by partitions, each column is provided with 3 groups of bent grids, each column is provided with a rapping frame and is respectively equipped with a rapper.

4. The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator according to claim 1 is characterized in that: A plurality of groups of dust collecting grids are arranged at intervals inside the inlet horn and the outlet horn.

5. The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator according to claim 4 is characterized in that: The interval ranges from 100 mm to 200 mm.

6. The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator according to claim 1 is characterized in that: At least one layer of porous curved plate is also arranged in the gap between the adjacent electric fields.

7. The multi-zone coupled high-efficiency dust removal dry electrostatic precipitator according to claim 1 is characterized in that: In adjacent electric fields, a porous curved plate is used as an anode plate in the front electric field, and a porous curved plate is arranged between adjacent cathode lines in the rear electric field.

Images