JP5513934B2 - Moving electrode type electrostatic precipitator - Google Patents

Description

  The present invention relates to a moving electrode type electrostatic precipitator, and in particular, fixed to scrape dust of a dust collecting electrode plate which is arranged in the vicinity of a number of discharge electrodes suspended in a casing with a predetermined interval. The present invention relates to an electric dust collector equipped with a brush.

  This type of electrostatic precipitator is known as an electrostatic precipitator for removing dust in, for example, boiler exhaust gas from a thermal power plant and exhaust gas from various steelmaking furnaces. The schematic structure shown in Patent Document 1 is shown in FIG. Description will be made with reference to FIG.

  In FIG. 7, the moving electrode type electrostatic precipitator 10 includes a casing 12, a hopper 13 below the casing 12, a number of discharge frames (discharge electrodes) 14 and a number of moving electrodes 15 disposed in the casing 12. The exhaust gas 17 introduced into the casing 12 from the inlet flue 16 is removed by the principle of electrostatic dust collection and discharged from the outlet flue 18. The collected dust falls into the hopper 13 and is taken out from the discharge port 20 by a mechanism (not shown).

  FIG. 8 is a view taken along the line A-A in FIG. 7, and a large number of discharge frames 14 are provided in the casing 12 at predetermined intervals via suspension frames 24 suspended from the insulator 22 shown in FIG. It is suspended. In addition, a large number of moving electrodes 15 that circulate every other discharge frame 14 are provided.

  That is, the moving electrode 15 has a pair of endless chains 30, 30 stretched between the upper drive wheel 26 and the lower roller 28, and a plurality of dust collecting electrode plates are disposed on the pair of endless chains 30, 30. 32 is locked and suspended at the position of the longitudinally intermediate portion 33 in the moving direction, and the plate surface is arranged along the gas flow, forming a loop as a whole. The drive shaft 34 of the drive wheel 26 is rotated by a drive mechanism (not shown), and the rotation of the drive shaft 34 is transmitted to a pair of endless chains 30 and 30 meshing with the drive wheel 26 to form a plurality of dust collecting bodies forming the loop. The electrode plate 32 moves around every other discharge frame 14.

  FIG. 9 is a layout view of the lower part of the moving electrode 15, and the dust collecting electrode plate 32 suspended and lowered by the endless chain 30 makes a U-turn at the position of the lower roller 28 and starts to rise. A pair of rotating brushes 36 and 38 (brush means 40) is arranged for each lane of the moving electrode 15 at a position sandwiching the dust collecting electrode plate 32 immediately after the ascent. The brushes 36 and 38 are made by implanting a metal brush on the rotating shaft, and the brush 36 is rotated clockwise and the brush 38 is counterclockwise so that dust adhering to the surface of the dust collecting electrode plate 32 is wiped down. Rotate around. The dust collecting electrode plate 32 from which the dust adhered to the surface has been removed by the brush means 40 is sequentially raised, and the dust in the exhaust gas is collected on the surface by the principle of electric dust collection in the discharge region where the discharge frame 14 is, It will descend again.

  By the way, in the case of a large-scale device, the moving electrode 15 has a number of 50 to 100 lanes, and a driving device for driving these and a driving device for rotationally driving the brush means 40 are necessary. When the brush means is worn, the work for changing (adjusting) the pressing allowance of the brush means is periodically performed. However, since there is a driving means, the amount of work is large, which is a burden in terms of cost. . Furthermore, when adjustment is not sufficient, the brush means is replaced to ensure the function, but the cost and labor are required.

  Patent Document 2 discloses an electric dust collector using a fixed brush. In this technique, a fixed brush is pressed and brought into contact with a metal net of a dust collecting electrode by its own weight or weight, and dust is scraped off. This fixed brush has a simple structure as compared with the rotating brush, and requires less cost and labor to replace the brush means for ensuring the function. When the fixed brush of Patent Document 2 is adopted in the electric dust collector of Patent Document 1, the one shown in FIG. 10 can be considered.

JP 2001-246286 A JP 2003-62486 A

  However, since the dust collecting electrode plate 32 is locked at the position of the intermediate portion 33 and suspended from the endless chain 30, the dust collecting electrode plate 32 may be swayed, and the support portion is fixed by the electric dust collector of FIG. 10. When a pair of fixed brushes that move toward both sides (front and rear surfaces) of the dust collecting electrode plate 32 by its own weight are configured to be movable independently, when the position of the dust collecting electrode plate 32 is shifted, one brush falls by its own weight, The brush is lifted upward. Referring to FIG. 10, FIG. 10 (a) shows a case where the dust collecting electrode plate 32 is not displaced, and FIG. 10 (b) shows a case where it is displaced in the arrow (left) direction. As shown in FIG. 10B, when the dust collecting electrode plate 32 is displaced to the left from the tip of the right brush 42, the brush 42 is lowered by its own weight, and the tip of the right brush 41 is the dust collecting electrode plate 32. It is lifted upward, and the angle between the two brushes and the dust collecting electrode plate 32 is different, and the pressing force becomes non-uniform. Therefore, the dust on both sides of the dust collecting electrode plate 32 cannot be scraped uniformly, and the dust scraping efficiency is deteriorated, which in turn deteriorates the dust collecting efficiency.

  In view of the above-described conventional problems, an object of the present invention is to provide a moving electrode type electrostatic precipitator capable of obtaining a uniform scraping performance on both surfaces of a movable dust collecting electrode plate.

In order to solve the above problems, the present invention provides a casing for flowing a dust-containing gas from an inlet to an outlet of a gas, a number of discharge electrodes suspended in a gas flow path serving as a dust collection area in the casing, Moving with a plurality of moving electrodes having scraping means that circulates in a loop by a plurality of dust collecting electrode plates suspended from an endless chain and brushes the surface of the circulating dust collecting electrode plates at a predetermined position. In the electrode type electrostatic precipitator, the scraping means is
A pair of long brushes extending in the width direction on both sides of the dust collecting electrode plate;
A pair of brush fixing shafts pivotally supported by the casing that supports the long brushes and rotates in a direction in contact with both surfaces of the dust collecting electrode plate;
A pair of link rods, one of which is fixed to each of the brush fixing shafts and rotating together with the brush fixing shaft;
It is attached to the other of the link rods, and includes a common urging means for urging the link rods in a direction in which the long brushes come into contact with both sides of the dust collecting electrode plate .
The long brush and the brush fixing shaft are arranged in the casing, the link rod and the biasing means are arranged outside the casing, and the link rod is fixed to the end of the brush fixing shaft protruding through the casing. It is characterized by that.

  The moving electrode type electrostatic precipitator described above further includes a guide member for restricting a biasing direction by the biasing means.

  In the moving electrode type electrostatic precipitator described above, the biasing means is a weight.

  In the moving electrode type electrostatic precipitator described above, the link bar and the biasing means are connected by a wire.

  In the moving electrode type electrostatic precipitator described above, the link rod and the biasing means are connected by a link member.

  According to the present invention, dust on both surfaces of a movable dust collecting electrode plate can be uniformly dropped with a simple configuration, and dust collection efficiency can be increased.

It is an arrangement plan of the lower part of the movement electrode of Example 1 of the present invention. It is a perspective view which shows the structure of the scraping means of Example 1. FIG. It is explanatory drawing of operation | movement of the scraping means of Example 1. FIG. It is explanatory drawing of the operation link of Example 2. FIG. It is explanatory drawing of the scraping-off means of Example 3. FIG. It is explanatory drawing of the scraping-off means of Example 4. FIG. It is side sectional drawing which shows the general structure of an electrical dust collector. It is an AA arrow line view of FIG. FIG. 5 is a general arrangement view of a lower part of a moving electrode. It is operation | movement explanatory drawing at the time of comprising a fixed brush so that it was movable independently.

  FIG. 1 is a layout diagram of a lower part according to the first embodiment of the present invention. The overall configuration of the electrostatic precipitator is the same as that shown in FIGS. 7 to 10 described in the section of the background art, and the same reference numerals as those described above denote the same elements. FIG. 2 is a perspective view showing the configuration of the scraping means, in which the dust collecting electrode plate is omitted, and FIG. 3 is an explanatory view of the operation of the scraping means.

  In FIG. 1, the moving electrodes 15A, 15B, and 15C arranged in parallel are suspended by the endless chain 30 and the dust collecting electrode plates 32A, 32B, and 32C that have been lowered due to circulation make U-turns at the position of the lower roller 28 and turn upward. Scraping means 40A, 40B, and 40C are disposed at positions that sandwich both surfaces of the dust collecting electrode plates 32A, 32B, and 32C immediately after the ascent.

  The scraping means 40A is a pair of long brushes 1 and 2 of the same size that are in contact with both sides of each dust collecting electrode plate in the width direction, and contacts both surfaces of the dust collecting electrode plate 32A while supporting the long brush. There are provided brush fixing shafts 3 and 4 that rotate in such a manner. Although the dust collecting electrode plate 32A is sandwiched between the long brushes 1 and 2, it is not shown in FIG. The brush fixing shafts 3 and 4 have a long shape, and an intermediate portion of the brush fixing shafts 3 and 4 is arranged inside the casing 12 to support the entire roots of the long brushes 1 and 2, and both ends are provided on bearings 3 a and 4 a provided on the casing 12. It is pivotally supported. One end of the brush fixing shafts 3 and 4 protrudes outside the casing 12 through the bearings 3a and 4a. The long link rods 5 and 6 having the same dimensions are fixed to one ends of the brush fixing shafts 3 and 4 protruding to the outside of the casing 12, and the link rods 5 and 6 and the brush fixing shaft 3 and 4 rotates integrally.

  The link rods 5 and 6 extend downward from one end of the brush fixing shafts 3 and 4 and are fixed so as to intersect in the middle. The wires 7 and 8 are fixed to the lower ends, and the lower ends of both the wires 7 and 8 are fixed. A weight 11 as a common biasing means is suspended. Reference numeral 9 denotes a wire guide shaft (guide member) that regulates the movement (biasing) direction of the wire, and is positioned between the bearings 3a and 4a and below the casing 12 via the mounting seat 9a so as to be positioned below. Fixed to the outer wall. Both wires 7 and 8 are hung on the wire guide shaft 9 so as to extend downward from the lower ends of the link rods 5 and 6 and cross in the middle, further extend downward, and the weight 11 is suspended.

  Since the weight 11 is a common weight, the lower end of the link rods 5 and 6 is always in the direction of the wire guide shaft 9 (fixed position) via both wires 7 and 8 while the descending locus due to its own weight is regulated in the vertical direction. Pull (energize) with about half the weight of the weight. Accordingly, the long brushes 1 and 2 can be brought into contact with both surfaces thereof with a substantially uniform pressing force while always approaching the center so as to sandwich the dust collecting electrode plate 32A.

  The long brushes 1 and 2 are metal brushes formed by bundling wire-like metal hairs, and the dust collecting electrode plate 32A advances by an angle α (45 ° to 90 °) with the surface of the dust collecting electrode plate 32A. It arrange | positions so that it may incline and contact in a direction (upward). The other scraping means 40B and 40C have the same configuration as the scraping means 40A.

  Next, the operation of the scraping means 40A will be described. Fig.3 (a) shows the case where there is little abrasion of the hair tips of the long brushes 1 and 2, and the angle (alpha) with respect to the dust collection electrode plate surface is about 45 degrees. The wires 7 and 8 are pulled in the direction of the guide shaft 9 (arrows B1 and B2) by the weight of the weight 11, and the link rods 5 and 6 are in the directions of arrows C1 and C2 around the bearings 3a and 4a. Is urged to rotate. Accordingly, the brush fixing shafts 3 and 4 are also rotated in the directions of the arrows C1 and C2, and the long brushes 1 and 2 are rotated in the directions of the arrows D1 and D2 so that the dust collecting electrode plates 32A are sandwiched from both sides and are substantially pressed. The dust contacted by pressure is scraped off as the dust collecting electrode plate 32A moves upward. The contact pressure at this time is arbitrarily determined depending on the weight of the weight 11, but is set to a value suitable for scraping off depending on the adhesion force and hardness of the dust.

  Since the dust collecting electrode plate 32A is suspended from the endless chain 30 as described above, the dust collecting electrode plate 32A may sway during movement upward. According to the present embodiment, the weights of the weight 11 cause the wires 7 and 8 to pull the link rods 5 and 6 to the fixing position of the guide shaft 9 (in the directions of arrows B1 and B2) with substantially equal pressure. However, it is possible to always keep the dust collecting electrode plate 32A at the center of the long brush by making contact with an almost uniform pressing pressure so as to sandwich both surfaces of the dust collecting electrode plate 32A.

  FIG.3 (b) shows the case where the long brushes 1 and 2 wear out and the dimension is shortened by use for many years. Since the pressing force is always applied by the long brushes 1 and 2 to both surfaces of the dust collecting electrode plate 32A by the weight 11, the weight 11 is lowered by the amount of the shortened dimension, and the link rods 5 and 6 are respectively connected to C1, It rotates so that it may further close in the C2 direction, and the pressing force to the dust collecting electrode plate 32A by the long brushes 1 and 2 is secured. The long brushes 1 and 2 approach the horizontal direction, and the angle α with the surface of the dust collecting plate 32A approaches 90 °.

  Also in the state of FIG. 3B, as in FIG. 3A, the dust adhering to both surfaces is scraped off by the contact pressure of the long brushes 1 and 2 as the dust collecting electrode plate 32A moves upward. The Further, the long brush always comes into contact with both surfaces of the dust collecting electrode plate 32A with substantially equal pressing pressure, and the dust collecting electrode plate 32A can always be maintained at the center of the long brush while suppressing shaking.

  From the state of FIG. 3B, when the weight 11 is lowered to the lowest position and the link rods 5 and 6 are closed and the angle α is 90 °, the pressing force on both surfaces of the dust collecting electrode plate 32A cannot be secured. The long brush needs to be replaced.

  In the first embodiment, since the weight 11 is suspended from the lower ends of the link rods 5 and 6 via the wires 7 and 8, the scraping means can be configured very simply. In the above, the weight of the weight is used as the biasing means, but a spring material may be used. If the weight of the weight is used, the urging force can be kept constant regardless of the degree of wear of the long brush (regardless of the position of the weight), so the pressing pressure on the dust collecting electrode plate does not change. Stable scraping performance can be maintained.

  FIG. 4 shows a second embodiment related to a link bar, and the same reference numerals as those in FIG. 3 denote the same parts. Compared to the first embodiment, instead of the wires 7 and 8, the link rods 5 and 6 are pivotally supported at the lower ends of the link rods 5 and 6 by fulcrums 5a and 6a, respectively, and the lower ends of the link members 7a and 8a are the fulcrums. It is pivotally supported by 8b. Further, the link material 7b is fixed to the lower ends of the link materials 7a and 8a, and the weight 11 is suspended. The projections 9b and 9c fixed to the outer wall of the casing 12 (not shown) constitute a link guide groove 9d (guide member). The link member 7b is passed through the guide groove 9d and the weight 11 is suspended. . The link guide groove 9d serves to regulate the downward trajectory (biasing direction) due to the weight of the weight 11 in the vertical direction so as not to be shifted laterally.

  In the second embodiment having the above-described configuration, the same operations as in FIGS. 3A and 3B are performed by using the link members 7a, 8a, and 7b instead of the wires 7 and 8 of the first embodiment. That is, by pulling (biasing) the fulcrum 8b of the link members 7a and 8a in the vertical direction with the link member 7b, an urging force about half the weight of the weight is applied to the link rods 5 and 6, respectively. The long brushes 1 and 2 can be brought into contact with each other so as to be sandwiched between both surfaces of the electrode plate 32A with substantially equal pressing force. Moreover, since the link materials 7a and 8a are used in the second embodiment compared to the wires 7 and 8 of the first embodiment, the rigidity of the scraping means can be increased.

  FIG. 5 is a perspective view showing the configuration of scraping means according to the third embodiment of the present invention. One end of the fixed shafts 3, 4 passes through the bearings 3 a, 4 a and protrudes outside the casing 12, and further passes through a seat plate 51 fixed to the outer wall of the casing 12 and protrudes outside. Leveres (corresponding to link rods) 52 and 53 are fixed to one ends of the fixed shafts 3 and 4 protruding from the seat plate 51, respectively, and the fixed shafts 3 and 4 are rotated by rotating the levers 52 and 53 by hand. Is configured to rotate. The levers 52 and 53 are provided with through holes 54 at predetermined positions, and the seat plate 51 is provided with a number of fixing holes 55 along a circle drawn by the through holes 54 when the lever rotates. Bolts (not shown) are inserted into the through holes 54 and the fixing holes 55 so that the fixing shafts 3 and 4 can be stopped at predetermined positions.

  When the lengths of the long brushes 1 and 2 are shortened due to wear, the levers 52 and 53 are rotated in the direction of the arrow in FIG. 5 to bring the tips of the long brushes 1 and 2 into contact with the dust collecting electrode plate. fix it with bolts. Accordingly, the long brushes 1 and 2 can be brought into contact with the dust collecting electrode plate with an appropriate pressing force in accordance with the state of wear. Moreover, since the levers 52 and 53 can be rotated individually, they can be individually adjusted according to the wear state of each long brush.

  FIG. 6 is a perspective view showing the configuration of scraping means according to the fourth embodiment of the present invention. The difference from the third embodiment is that the levers 62 and 63 are fixed to one end of the fixed shafts 3 and 4 in a crossed state, and the through holes 64 are provided at the lower ends of the levers 62 and 63, respectively. An arc plate 61 is provided in the casing 12 instead of the seat plate 51, and a number of fixing holes 65 are provided along the arc drawn by the through hole 64 when the lever rotates on the arc plate 61. When the lengths of the long brushes 1 and 2 are shortened due to wear, the levers 62 and 63 are rotated in the direction of the arrow in FIG. Make contact with the electrode plate and fix with bolts. Since the levers 62 and 63 can be individually rotated in this embodiment, the levers 62 and 63 can be individually adjusted according to the wear state of each long brush.

  1, 2 ... long brush, 3, 4 ... brush fixing shaft, 5, 6 ... link rod, 5a, 6a, 8a ... fulcrum, 7, 8 ... wire, 7a, 7b, 8a ... link material, 9, 9d ... Guide member (guide shaft, guide groove), 10 ... moving electrode type electrostatic precipitator, 11 ... biasing means (weight, spring) 12 ... casing, 14 ... discharge electrode, 15 ... moving electrode, 30 ... endless chain, 32A 32C ... dust collecting electrode plate, 40A-40C ... scraping means.

Claims (5)

A casing for flowing dust-containing gas from the gas inlet to the outlet, a number of discharge electrodes suspended in a gas flow path serving as a dust collection area in the casing, and a plurality of collectors suspended by a pair of endless chains In a moving electrode type electrostatic precipitator equipped with a number of moving electrodes having scraping means that forms a loop with a dust electrode plate and circulates and brushes the surface of the circulating dust collecting electrode plate at a predetermined position. Dropping means is
A pair of long brushes extending in the width direction on both sides of the dust collecting electrode plate;
A pair of brush fixing shafts pivotally supported by the casing that supports the long brushes and rotates in a direction in contact with both surfaces of the dust collecting electrode plate;
A pair of link rods, one of which is fixed to each of the brush fixing shafts and rotating together with the brush fixing shaft;
It is attached to the other of the link rods, and includes a common urging means for urging the link rods in a direction in which the long brushes come into contact with both sides of the dust collecting electrode plate .
The long brush and the brush fixing shaft are arranged in the casing, the urging means common to the link rod is arranged outside the casing, and the link rod is fixed to the end of the brush fixing shaft protruding through the casing. The moving electrode type electrostatic precipitator characterized by being made . 2. The moving electrode type electrostatic precipitator according to claim 1, wherein the biasing means is a weight . 3. The moving electrode type electrostatic precipitator according to claim 1, further comprising a guide member for restricting a biasing direction by the biasing means . The moving electrode type electrostatic precipitator according to any one of claims 1 to 3, wherein the link bar and the biasing means are connected by a wire . The moving electrode type electrostatic precipitator according to any one of claims 1 to 3 , wherein the link rod and the biasing means are connected by a link member .

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