JP2012179526A - Method for converting electric dust collector, and electric dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for converting an electric dust collector and an electric dust collector.SOLUTION: The method for converting an electric dust collector 10 housing a fixed electrode type electric dust collector 28 in a casing 12 replaces the fixed electrode type electric dust collector 28 with a moving dust collecting electrode 46 and a discharge electrode 54 corresponding to the moving dust collecting electrode 46. A hopper 20 located at the lower end of the casing 12 facing the fixed electrode type electric dust collector 28, is removed to form a lower opening 64, and a hoist 78 is disposed at a position facing the lower opening 64 of the casing 12. After the fixed electrode type electric dust collector 28 is removed, the moving dust collecting electrode 46 and the discharge electrode 54 are lifted by the hoist 78 and carried in through the lower opening 64.

Description

  The present invention relates to an electrostatic precipitator, and more particularly to a technique for replacing part or all of a fixed electrode electrostatic precipitator with a moving electrode electrostatic precipitator.

There is a request for remodeling / renovation work aimed at improving the performance of electrostatic precipitators by strengthening soot emission control values and aging of existing precipitators.
Of these, additional means are generally used to improve the performance of fixed electrode type electrostatic precipitators that collect dust with a fixed dust collection electrode, but there are almost no existing installations with extra space. It is.

  On the other hand, the mobile electrode type electrostatic precipitator that collects soot dust by the moving dust collecting electrode has high performance for separating dust attached to the moving dust collecting electrode by the brush, and the moving dust collecting electrode is kept clean. As a result, the dust collection performance is also improved. Therefore, replacement with a moving electrode type electrostatic precipitator is effective for improving the performance of part or all of the existing fixed electrode type precipitator.

  As a renewal work of the fixed electrode type electrostatic precipitator, in Patent Document 1, a method of carrying in and out the fixed dust collector electrode from an opening provided on the upper side surface of the casing of the fixed electrode type precipitator is also patented. Document 2 discloses a method for loading and unloading a fixed dust collecting electrode from an opening from which a hopper at the lower end of a casing accommodating a fixed electrode type electrostatic dust collecting device is removed.

  On the other hand, as the installation or renewal work of the mobile electrode type electrostatic precipitator, in Patent Document 3, the discharge electrode is carried in from the opening from which the hopper at the lower end of the casing is removed by the portal mobile crane disposed above the casing. A method of carrying in and attaching a moving dust collecting electrode from an opening after attachment is disclosed. In Patent Document 4, an endless chain that constitutes a moving dust collecting electrode is attached to a driving wheel that drives a moving dust collecting electrode, and each dust collecting electrode that constitutes a moving dust collecting electrode in the vicinity of the driving wheel is attached to the endless chain. A method of continuous attachment is disclosed. In Patent Document 5, one end of an endless chain is cut off, one end of a new chain is connected to one end of an endless chain, and the endless chain is moved around while the dust collecting electrode plate attached to the endless chain is sequentially replaced with the new chain. At the stage when the new chain makes a round, remove the endless chain from which all the dust collection electrode plates have been removed, and connect one end of the new chain to the other end to replace the endless chain of the moving dust collection electrode with the new chain A method is disclosed.

  Patent Document 6 discloses a configuration in which a fixed electrode type electrostatic precipitator and a moving electrode type precipitator are arranged in a casing, and the fixed electrode type electrostatic precipitator is arranged upstream of exhaust gas passing through the casing. The moving electrode type electrostatic precipitator is arranged on the downstream side of the exhaust gas. Therefore, the fixed electrode type electrostatic precipitator at the front stage collects soot with a large particle size, and the rear stage movable electrode type electrostatic precipitator collects soot with a small particle size that is difficult to remove with the fixed electrode type electrostatic precipitator. be able to. Therefore, it is desirable that the fixed electrode type electrostatic precipitator be modified as shown in Patent Document 6.

JP-A-7-96214 JP-A-9-290177 JP 2000-342993 A JP 2000-342996 A JP 2000-342995 A Japanese Patent Laid-Open No. 57-32742

  However, the configuration of Patent Document 6 is designed so that the casing itself can appropriately arrange the fixed electrode type electrostatic dust collector and the moving electrode type electrostatic dust collector. Further, in the fixed electrode type electrostatic precipitator and the moving electrode type electrostatic precipitator, not only the size (height) of the device but also the height position of the region where dust can be effectively collected from the exhaust gas is different. Therefore, in order to realize the configuration of Patent Document 6 in the conventional fixed electrode type electric dust collector, a part to which the moving electrode type electric dust collector is attached must be newly manufactured in the casing, which is costly. There is a problem.

  Therefore, the present invention pays attention to the above-mentioned problem, and modifies an electric dust collector capable of replacing part or all of the fixed electrode type electrostatic dust collector with a moving electrode type electrostatic dust collector by using an existing casing as it is. It is an object to provide a method and an electrostatic precipitator formed by this method.

  In order to achieve the above object, a method for remodeling an electrostatic precipitator according to the present invention is, firstly, in an electrostatic precipitator in which a fixed electrode electrostatic precipitator is arranged in a casing, The dust collecting device is replaced with a moving dust collecting electrode and a discharge electrode corresponding to the moving dust collecting electrode.

  By the above method, there is no need to design a new casing, and the existing fixed electrode type electrostatic precipitator is replaced with a moving electrode type precipitator composed of a moving dust collecting electrode and a discharge electrode. It can be used to improve the treatment capacity of exhaust gas.

  Second, the fixed electrode type electrostatic precipitator is arranged in a plurality of stages in the direction of the flow path of the exhaust gas flowing through the casing in the casing, and a part of the fixed electrostatic precipitator or After the fixed electrostatic precipitator of all stages is removed, the moving dust collecting electrode and the discharge electrode are attached to the position where the fixed electrostatic precipitator is removed.

According to the above method, the degree of remodeling of the electrostatic precipitator can be changed according to the number of fixed electrode type electrostatic precipitators to be removed and the size of the moving dust collector.
Third, a hopper located at a position facing the fixed electrode type electrostatic precipitator at the lower end of the casing is removed to form a lower opening, and a hoist is disposed at a position facing the lower opening of the casing The moving dust collecting electrode and the discharge electrode are lifted by the hoist and carried from the lower opening.

  According to the above method, the moving dust collecting electrode and the discharge electrode do not need to be lifted so as to straddle the casing, and can be efficiently carried into the casing. In addition, since the discharge electrode and the moving dust collecting electrode are lifted by the hoist supported by the casing, the moving electrode type electric dust collecting device can be efficiently carried in even in the existing fixed electrode type electric dust collecting device in which it is difficult to secure a working space. can do.

  Fourth, a housing having an insertion hole communicating with the lower opening, and the movable collection supported in the insertion hole in a state arranged in a direction perpendicular to a flow path of exhaust gas flowing through the casing. An upper unit having a plurality of upper rollers that support upper ends of dust electrodes is disposed at a position between the hoist and the lower opening, and is arranged so as to face the upper rollers, and the moving dust collection The lower unit having a plurality of lower rollers supporting the lower ends of the electrodes is lifted by a wire that is drawn out from the hoist and inserted through the insertion hole, and is carried in from the lower opening.

  By the above method, it is not necessary to examine the mounting position of each moving dust collecting electrode at the installation site, and it is possible to easily attach a plurality of moving dust collecting electrodes while avoiding interference between the hoist and the upper unit. it can.

Fifth, the hopper is lifted by the hoist to seal the lower opening.
By the above method, the hopper can be easily lifted and the lower opening can be easily sealed.

  Sixth, the hoist is attached to a rail having a longitudinal direction in a direction perpendicular to the flow path of the exhaust gas passing through the casing at a position facing the insertion hole on the upper unit, and the hoist is moved along the rail The movable dust collection electrode is suspended by attaching the rail to the rail so that the movable dust collection electrode can be lifted and repeating the lifting of the new movement dust collection electrode by moving the hoist. A plurality of them are arranged in a direction perpendicular to the vertical axis.

  According to the above method, it is possible to efficiently carry in a discharge electrode even in an existing fixed electrode type electrostatic dust collector in which it is difficult to secure a work space, and it is possible to carry in a plurality of moving dust collection electrodes efficiently.

Seventh, an upper opening is formed at a position facing the fixed electrode type electrostatic precipitator at the upper end of the casing, and is supported in a state arranged in a direction perpendicular to the flow path of the exhaust gas flowing through the casing. A lower unit having a plurality of lower rollers for supporting the lower end of the moving dust collecting electrode is carried from the upper opening and disposed in the casing, and is supported in a state of being arranged so as to face the lower roller. The upper unit having a plurality of upper rollers for supporting the upper end of the moving dust collecting electrode is disposed at a position facing the upper opening on the casing.
By the above method, it is not necessary to examine the mounting position of each moving dust collecting electrode at the installation site, and a plurality of moving dust collecting electrodes can be easily mounted.

Eighth, the upper unit has an insertion hole communicating with the upper opening, the upper roller is supported in the insertion hole, and the moving dust collecting electrode is carried in from the insertion hole. And
By the above method, the movable dust collecting electrode can be carried into the casing without interfering with the upper unit.

Ninth, an extension casing is disposed at a position on the casing facing the upper opening, and the upper end of the casing is extended.
By the above method, the moving dust collecting electrode can be arranged on the existing casing without being restricted by the height of the moving dust collecting electrode.

Tenthly, a guide plate is provided that guides the exhaust gas reaching a region lower than the lower end of the discharge electrode in the exhaust gas flow path to a position higher than the lower end of the discharge electrode.
By the above method, it is possible to effectively collect the dust in the exhaust gas by preventing the exhaust gas from passing through the region below the discharge electrode of the moving dust collection electrode where it is difficult to collect the dust.

On the other hand, an electrostatic precipitator according to the present invention includes, firstly, a casing through which exhaust gas flows, a fixed electrode type electrostatic precipitator disposed upstream of the exhaust gas flow path in the casing, A moving dust collecting electrode that is arranged downstream of the exhaust gas flow path and circulates in a loop by a plurality of connected dust collecting electrodes as a whole, and a discharge dust collector arranged at a position facing the moving dust collecting electrode. An electrode, and a guide plate that is disposed in a region lower than the lower end of the discharge electrode of the exhaust gas flow path and guides the exhaust gas reaching the region to a position higher than the lower end of the discharge electrode. And
With the above configuration, it is possible to effectively collect the dust in the exhaust gas by suppressing the passage of the exhaust gas to the region below the discharge electrode of the moving dust collection electrode where it is difficult to collect the dust.

Secondly, a plurality of the moving dust collecting electrodes are arranged in a direction perpendicular to the flow path, and a lower roller supporting the lower end of each moving dust collecting electrode is supported by the lower unit, The guide plate is attached.
With the above configuration, since the guide plate is attached to the lower unit, the guide plate can be easily installed.

Thirdly, exhaust gas diffusing means is disposed between the fixed electrode type electrostatic precipitator and the movable dust collecting electrode.
With the above configuration, exhaust gas can be spread over the entire moving dust collection electrode, and soot can be efficiently collected from the exhaust gas.

Fourth, the fixed electrode type electrostatic precipitator is arranged in a plurality of stages in the direction of the flow path of the exhaust gas flowing through the casing in the casing, and the moving dust collection electrode is arranged to be the fixed electrode type electrostatic precipitator. The fixed electrode type electrostatic precipitator at some or all of the stages of the apparatus is attached to a removed position.
By the above method, the degree of modification of the electrostatic precipitator can be changed according to the number of stages of the fixed electrode electrostatic precipitator to be removed.

Fifthly, the fixed electrode type electrostatic precipitator is arranged in a plurality of stages in the direction of the flow path of the exhaust gas flowing through the casing in the casing, and the width of the moving dust collection electrode is set to the fixed electrode type electric dust collector. The movable dust collecting electrode is formed wider than the dust collecting device, and the moving dust collecting electrode is attached to a position where the fixed electrode type electrostatic dust collecting devices of at least two continuous stages are removed from the fixed electrode type electric dust collecting device. It is characterized by that.
With the above configuration, these can be arranged in the casing without being restricted by the width of the moving dust collection electrode.

Sixth, a diffusion space for diffusing exhaust gas is formed between the moving dust collection electrode and the fixed electrode type electrostatic precipitator, and the exhaust gas diffusion means is disposed in the diffusion space. Features.
With the above configuration, it is possible to ensure the flow path length necessary for diffusing the exhaust gas and effectively diffuse the exhaust gas by the exhaust gas diffusing means.

Seventh, the upper opening is formed at a position facing the moving dust collecting electrode at the upper end of the casing, and an extension casing is disposed at a position facing the upper opening on the casing, The upper end of the casing is extended.
With the above configuration, the moving dust collecting electrode can be arranged in the existing casing without being restricted by the height of the moving dust collecting electrode.

  According to the method for remodeling an electrostatic precipitator according to the present invention and the electrostatic precipitator formed by this method, the inside of the casing in which the existing fixed electrode type electrostatic precipitator is arranged without securing a large work space. A moving electrode type electrostatic precipitator can be disposed on the casing, and the dust collecting ability in the exhaust gas in the entire casing can be enhanced.

It is a perspective view of the electrostatic precipitator of this embodiment (one stage of fixed electrode type electrostatic precipitator, one stage of moving electrode type electrostatic precipitator). It is a front view of the electrostatic precipitator of this embodiment (4 steps of fixed electrode type electrostatic precipitators, 2 steps of moving electrode type electrostatic precipitators). It is the elements on larger scale of 2 steps | paragraphs of moving electrode type electrostatic precipitators of FIG. It is a side view of the electrostatic precipitator of this embodiment, Drawing 4 (a) is a side view of a fixed electrode type electrostatic precipitator, and Drawing 4 (b) is a side view of a moving electrode type electrostatic precipitator. is there. It is a partial schematic diagram of the electrostatic precipitator of this embodiment, FIG. 5A is a plan view of an upper cover constituting the moving electrode type electrostatic precipitator, and FIG. 5B is a moving electrode type electrostatic precipitator. FIG. 5C is a plan view of the lower unit constituting the moving electrode type electrostatic precipitator. It is a schematic diagram of the remodeling process of the electrostatic precipitator of 1st Embodiment (a fixed electrode type electrostatic precipitator 2 steps | paragraphs), FIG. The dust collecting electrode, discharge electrode, ceiling and hopper removal process of the dust collector, FIG. 6 (c) shows the soot tube chamber mounting process, and FIG. 6 (d) shows the upper unit mounting process. It is a schematic diagram which shows the 1st remodeling process (discharge electrode frame lifting process after upper cover attachment) of the electrostatic precipitator of 1st Embodiment, Fig.7 (a) is a front view, FIG.7 (b) is a side view. It is. It is a schematic diagram which shows the remodeling process (discharge electrode lifting process) of the electrostatic precipitator of 1st Embodiment, Fig.8 (a) is a front view, FIG.8 (b) is a side view. It is a schematic diagram which shows the remodeling process (before moving dust collection electrode lifting) of the electrostatic dust collector of 1st Embodiment, Fig.9 (a) is a front view, FIG.9 (b) is a side view. It is a schematic diagram which shows the remodeling process (after moving dust collection electrode lifting) of the electrostatic dust collector of 1st Embodiment, Fig.10 (a) is a front view, FIG.10 (b) is a side view. It is a schematic diagram which shows the remodeling process (lower unit lifting process) of the electric dust collector of 1st Embodiment, Fig.11 (a) is a front view, FIG.11 (b) is a side view. It is a schematic diagram which shows the remodeling process (hopper lifting process) of the electric dust collector of 1st Embodiment, Fig.12 (a) is a front view, FIG.12 (b) is a side view. It is a schematic diagram which shows the remodeling process (after hopper attachment) of the electrical dust collector of 1st Embodiment, Fig.13 (a) is a front view, FIG.13 (b) is a side view. It is a schematic diagram of the remodeling process of the electrostatic precipitator of 2nd Embodiment (a fixed electrode type electrostatic precipitator 2 steps | paragraphs), FIG. FIG. 14 (c) shows the step of carrying in the lower electrode after the dust collector is removed, FIG. 14 (c) shows the step of carrying in the discharge electrode frame after attaching the soot tube chamber, and FIG. 14 (d) shows the step of carrying in the discharge electrode. It is a schematic diagram of the remodeling process of the electric dust collector of 2nd Embodiment, Fig.15 (a) is an attachment process of an upper unit, FIG.15 (b) is a carrying-in process (at the time of suspension) of a moving dust collection electrode, FIG. 15 (c) shows a moving dust collecting electrode carrying-in process (immediately after hanging), and FIG. 15 (d) shows an upper cover attaching process. It is a side view of FIG.15 (b). It is a mimetic diagram showing the modification of the electric dust collector of this embodiment.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .

  In FIG. 1, the perspective view of the electrostatic precipitator of this embodiment (one stage of fixed electrode type electrostatic precipitators, one stage of moving electrode type electrostatic precipitator) is shown. FIG. 2 is a front view of the electrostatic precipitator of this embodiment (four stages of fixed electrode type electrostatic precipitator, two stages of moving electrode type electrostatic precipitator). FIG. 3 shows a partially enlarged view of the two-stage moving electrode type electrostatic precipitator in FIG. 4 shows a side view of the electrostatic precipitator of the present embodiment, FIG. 4 (a) is a side view of the fixed electrode type electrostatic precipitator, and FIG. 4 (b) is a moving electrode type electrostatic precipitator. The side view of is shown. In any of the above drawings, the electrostatic precipitator is modified by the method of remodeling the electrostatic precipitator of the present embodiment.

  As for the electrostatic precipitator before the method for remodeling the electrostatic precipitator of the present embodiment is applied, the one arranged in the casing is the fixed electrode electrostatic precipitator 28. In the present embodiment, the main object is to replace a part (or all) of the fixed electrode type electrostatic precipitator 28 with the moving electrode type electrostatic precipitator 44.

  The modified electric dust collector 10 includes a casing 12 through which exhaust gas flows, a fixed electrode type electrostatic dust collector 28 disposed on the upstream side of the exhaust gas passage in the casing 12, and the exhaust gas passage. A moving dust collecting electrode 46 that is arranged on the downstream side of the dust collecting electrode plate 48 and circulates in a loop by a plurality of connected dust collecting electrode plates 48, and is arranged inside the loop and faces the moving dust collecting electrode 46. Discharge electrode 54 (discharge electrode 55, see FIG. 14). Further, the exhaust gas flow path is disposed in a region lower than the lower end of the discharge electrode 54 (discharge electrode 55), and the exhaust gas reaching the region is positioned higher than the lower end of the discharge electrode 54 (discharge electrode 55). And a guide plate 94 for guiding. Further, the position of the upper end of the casing 12 facing the moving dust collecting electrode 46 is extended in accordance with the height of the upper end of the moving dust collecting electrode 46 (upper unit 66).

Hereinafter, the electric dust collector 10 will be described in detail, and the remodeling method of the first embodiment and the remodeling method of the second embodiment will be described.
The modified electrostatic precipitator 10 (see FIG. 1) is formed on the site of a factory or the like in a form in which the entire outer shape is formed by the casing 12 and is supported by a plurality of support columns 14 and is generally floated at a certain height. Is done. In front of the casing 12, an inlet flue 16 into which exhaust gas from a boiler or factory of a power plant flows is formed. Further, an outlet flue 18 from which exhaust gas after collecting dust is discharged is formed on the opposite surface of the casing 12 facing the inlet flue 16. Therefore, the exhaust gas flow path is formed along the line connecting the inlet flue 16 and the outlet flue 18 in the casing 12.

  A pyramid-shaped hopper 20 is attached to the lower surface of the casing 12 in an array. When the hopper 20 is removed, a lower opening 64 (see FIG. 6) described later is formed on the lower surface of the casing 12. A fixed electrode type electrostatic precipitator 28 is disposed on the upstream side of the exhaust gas flow path of the casing 12, and a moving electrode type electrostatic precipitator 44 is disposed on the downstream side. In addition, a large number of openings 26 are formed on the main surface between the inlet flue 16 of the casing 12 and the fixed electrode type electrostatic precipitator 28, so that a gas distribution plate 24 having a mesh structure as a whole. Is arranged so as to block the entire exhaust gas flow path. The gas distribution plate 24 imparts a certain resistance to the inflowing exhaust gas and causes it to flow through the opening 26 so that the exhaust gas flows uniformly in the casing so that dust can be collected efficiently.

  The fixed electrode type electrostatic precipitator 28 has a fixed dust collecting electrode 42 and a discharge electrode 30 suspended from the upper end of the casing 12. The fixed dust collection electrode 42 is disposed so as to be suspended from the upper end of the casing 12 and is disposed such that the normal line of the main surface thereof is perpendicular to the direction of the flue of the exhaust gas. A plurality of fixed dust collection electrodes 42 are arranged in a line at regular intervals in the normal direction.

  The discharge electrode 30 is arranged at a certain interval at a position where the main surface thereof faces the main surface of the fixed dust collection electrode 42. Therefore, the discharge electrodes 30 and the fixed dust collection electrodes 42 are alternately arranged in a line in a direction perpendicular to the exhaust gas flow path. The discharge electrode 30 is connected to the discharge electrode frame 32 at both ends on the flow path side. Here, it is assumed that the fixed dust collection electrode 42 is disposed at a position closest to the discharge electrode 30. Therefore, when a negative voltage is applied to the discharge electrode 30 to release negative ions from the discharge electrode 30, the released negative ions propagate toward the fixed dust collection electrode 42.

  The discharge electrode frame 32 is a member having a beam 32a having a longitudinal direction in the arrangement direction of the discharge electrodes 30, and the discharge electrode 30 is connected to the beam 32a. The discharge electrode frame 32 is connected to a discharge electrode frame support 34 that hangs down from the upper end of the casing 12.

  The discharge electrode frame support 34 is a rod-like member that hangs down from the lower portion of the tub tube chamber 38. The discharge electrode frame support 34 supports the discharge electrode frame 32 in a state of penetrating a conical insulator 36 installed in the tub tube chamber 38. Therefore, the discharge electrode frame support 34 is supported by the soot tube chamber 38 via the insulator 36 and is electrically insulated from the soot tube chamber 38 (casing 12). Therefore, the discharge electrode frame support 34, the discharge electrode frame 32, and the discharge electrode 30 are electrically insulated from the casing. The soot tube chamber 38 is sealed and kept warm to prevent condensation on the surface of the insulator 36 and prevent leakage. Furthermore, the discharge electrode frame support 34 is electrically connected to a charging facility 40 disposed outside the casing 12.

  Here, since the casing 12 is grounded, the fixed dust collecting electrode 42 directly connected to the casing 12 is also grounded. On the other hand, a negative high voltage is applied to the discharge electrode frame support 34 by the charging equipment 40, whereby a negative high voltage is also applied to the discharge electrode frame 32 and the discharge electrode 30. Accordingly, negative ions are released from the discharge electrode 30 in a direction intersecting the exhaust gas flow path and propagate toward the fixed dust collection electrode 42. In this state, when exhaust gas is carried in from the inlet flue 16, negative ions adhere to the dust in the exhaust gas, and the dust is negatively charged and adheres to the fixed dust collecting electrode 42, so that the dust in the exhaust gas is removed. The The fixed dust collecting electrode 42 is beaten with a hammer (not shown), so that the dust adhering to the fixed dust collecting electrode 42 is knocked down and collected at the lower end of the hopper 20, and the casing 12 passes through the discharge port 22 provided at the lower end of the hopper 20. Soot can be discharged from

  The fixed electrode type electrostatic dust collector 28 including the fixed dust collecting electrode 42, the discharge electrode 30, the discharge electrode frame 32, the discharge electrode frame support 34, and the like is arranged in a plurality of stages in the direction of the exhaust gas flow path in the casing 12. However, the number of stages is arbitrarily designed according to the specifications.

  The moving electrode type electrostatic precipitator 44 includes a moving dust collecting electrode 46, a discharge electrode 54, an upper unit 66, a lower unit 84, and the like. The moving dust collection electrode 46 is connected in a row via a pair of loop-shaped chains 52, and includes a plurality of dust collection electrode plates 48 that form a loop. The main surface of the dust collecting electrode plate 48 is arranged in parallel to the direction of the exhaust gas flow path, and connection members 50 extend from both ends of the exhaust gas flow path direction, and the connection members 50 are connected to the chain 52. Has been. The loop of the moving dust collecting electrode 46 forms a circular arc of the loop at the upper end and the lower end thereof, and the other part has a shape facing the vertical direction. A plurality of the moving dust collecting electrodes 46 are arranged at a predetermined interval in a direction perpendicular to the exhaust gas flow path, like the fixed dust collecting electrodes 42 of the fixed electrode type electrostatic dust collecting device 28.

  The discharge electrode 54 is arranged at a certain interval at a position where the main surface thereof faces the main surface of the moving dust collection electrode 46. In this case, there are a discharge electrode 54 disposed between the loops formed by the moving dust collecting electrode 46 and a discharge electrode 54 disposed between the adjacent moving dust collecting electrodes 46.

  Therefore, the discharge electrode 54 and the moving dust collection electrode 46 are arranged in a line in a direction perpendicular to the exhaust gas flow path. The discharge electrode 54 is connected to the discharge electrode frame 56 at both ends on the flow path side. Here, it is assumed that the moving dust collection electrode 46 is disposed at a position closest to the discharge electrode 54. Therefore, when a negative high voltage is applied to the discharge electrode 54 to release negative ions from the discharge electrode 54, the released negative ions propagate toward the moving dust collection electrode 46.

  The discharge electrode frame 56 is a member having a beam 56a having a longitudinal direction in the arrangement direction of the discharge electrodes 54, and the discharge electrode 54 is connected to the beam 56a. The discharge electrode frame 56 is connected to a discharge electrode frame support 58 that hangs down from the upper end of the casing 12.

  The discharge electrode frame support 58 is a rod-like member that hangs down from the lower part of the tub tube chamber 60. The discharge electrode frame support 58 supports the discharge electrode frame 56 in a state of penetrating through a conical insulator 62 installed in the tub tube chamber 60. Therefore, the discharge electrode frame support 58 is supported by the soot tube chamber 60 via the insulator 62 and is electrically insulated from the soot tube chamber 60 (casing 12). Further, the discharge electrode frame support 58 is electrically connected to a charging facility 40 or the like disposed outside the casing 12. Accordingly, the discharge electrode frame support 58, the discharge electrode frame 56, and the discharge electrode 54 are electrically insulated from the casing 12. In addition, the soot tube chamber 60 is a room which is disposed at a position around the upper opening 100 on the casing 12 and extends along the longitudinal direction of the discharge electrode frame 56 (direction perpendicular to the flow path of the exhaust gas), An insulator 62 covering the discharge electrode frame support 58 is held inside.

  When the upper end of the moving dust collection electrode 46 is designed to be higher than the fixed dust collection electrode 42 of the fixed electrode type electrostatic dust collector 28, it interferes with the upper end of the casing 12. Therefore, an upper opening 100 (see FIG. 6) is formed at a position facing the moving dust collecting electrode 46 at the upper end of the casing 12, and the moving dust collecting electrode 46 protrudes from the upper end of the casing 12. The upper portion of the casing 12 is covered with an extension casing (extension member 82, soot tube chamber 60, upper unit 66, and upper cover 74) so as to cover the periphery of the upper opening 100. Therefore, the position facing the moving dust collecting electrode 46 (upper unit 66) at the upper end of the casing 12 is extended in the height direction.

  The extension member 82 is a member that extends the upper end of the casing, and has an opening that communicates with the upper opening 100 at its upper and lower ends. The upper cover 74 has an opening at the lower end. The upper unit 66 is a component of the moving electrode type electrostatic precipitator 44, but is integrated with the extension casing. Therefore, the movable dust collection electrode 46 is sealed in the internal space formed by the casing 12 and the extension casing (extension member 82, soot tube chamber 60, upper unit 66, upper cover 74). Thereby, the moving electrode type electric dust collector 44 can be installed in the existing casing 12 regardless of the height of the moving dust collecting electrode 46.

  Here, the width of the extension member 82, the soot tube chamber 60, the upper unit 66, the upper cover 74, and the lower unit 84 is substantially the same as the width of the hopper 20 in the direction of the exhaust gas flow path, but is perpendicular to the exhaust gas flow path. The appropriate direction is appropriately designed according to the number of moving dust collection electrodes 46 and discharge electrodes 54 arranged. The width of the upper opening 100 in the direction of the flow path of the exhaust gas has a dimension that does not interfere with the moving dust collection electrode 46 and the like inserted through the upper opening, and is perpendicular to the flow path of the exhaust gas in the upper opening 100. Is appropriately designed according to the number of moving dust collecting electrodes 46 and discharge electrodes 54 arranged.

  FIG. 5 shows a partial schematic diagram of the electrostatic precipitator of the present embodiment, FIG. 5 (a) is a plan view of an upper cover constituting the moving electrode type electrostatic precipitator, and FIG. 5 (b) is a moving electrode type. FIG. 5C is a plan view of the lower unit constituting the moving electrode type electrostatic precipitator, and FIG. 5C is a plan view of the upper unit constituting the electrostatic precipitator.

  The upper unit 66 is disposed at a position between a hoist 78 (described later) and the lower opening 64. The outer shape of the upper unit 66 is formed by a casing 68 having an insertion hole 68 a communicating with the upper opening 100 and the lower opening 64. The casing 68 has a longitudinal direction in the direction in which the moving dust collection electrodes 46 are arranged. A plurality of upper rollers 69 (rotating shafts 70) that are supported in the insertion holes 68a and that support the upper end of the moving dust collecting electrode 46 in a state of being arranged in a direction perpendicular to the flow path of the exhaust gas flowing through the casing 12. Drive wheel 72).

  The upper roller 69 is supported by the housing 68 and is arranged in accordance with the arrangement of the moving dust collecting electrode 46, and the chain 52 is engaged with the upper end of the moving dust collecting electrode 46 (a position where a circular arc of a loop is formed). ) And a driving wheel 72 that rotates the moving dust collecting electrode 46 along the chain 52 by rotating together with the rotating shaft 70, and a motor (not shown) that rotates the rotating shaft 70. The rotation shaft 70 has both ends in the longitudinal direction connected to the side surface of the flow path of the insertion hole 68a. Therefore, a plurality of the upper rollers 69 are arranged in the arrangement direction of the moving dust collecting electrode 46 at a position where a circular arc of the moving dust collecting electrode 46 is formed.

  The upper cover 74 is a lid-like member whose longitudinal direction is the direction in which the moving dust collection electrodes 46 are arranged, and is disposed on the upper unit 66. In addition, a pair of rails 76 whose longitudinal direction is the arrangement direction of the discharge electrodes 54 are attached to the upper surface (or a side surface) of the inner wall of the upper cover 74, and at least two hoists 78 are attached to the rails 76.

  The hoist 78 can move along the longitudinal direction of the rail 76, and can lift the article to be carried in by adjusting the length of the wire 80 to be fed out. In addition, the rail 76 and the hoist 78 are arrange | positioned in the position where the wire 80 which the hoist 78 pays out can be inserted through the insertion hole 68a.

  Similar to the upper unit 66, the lower unit 84 has a longitudinal direction in the arrangement direction of the moving dust collection electrodes 46 and is connected to the casing 12, and the lower unit 84 is arranged so as to face the upper roller 69. A plurality of lower rollers 87 (rotating shaft 88, lower wheel 90) supported by a body 86 and supporting the lower end of the moving dust collecting electrode.

  The lower roller 87 supports the lower end of the moving dust collecting electrode 46 (position where the arc of the loop is formed) by meshing with the rotation shaft 88 arranged following the arrangement of the moving dust collecting electrode 46 and the chain 52, The lower wheel 90 which rotates with the rotating shaft 88 in response to a force generated when the chain 52 loops (circulates) is provided. A plurality of the rotating shafts 88 are arranged so as to be directly below the rotating shaft 70 supported by the upper unit 66.

  Further, the lower unit 84 is a cylindrical member that is supported by the casing 86 and has a longitudinal direction in a direction perpendicular to the arrangement direction of the moving dust collecting electrodes 46, and the dust collecting electrode plate 48 that constitutes the moving dust collecting electrode 46. Has a pair of rotating brushes 92 disposed so as to be sandwiched from both sides. For example, the central axis of the rotary brush 92 extends to the outside of the casing 12 and is connected to a motor (not shown) that rotates the rotary brush 92 outside. Then, as shown in FIG. 4B, the pair of rotating brushes 92 rotate in opposite directions, and the traveling direction of the outer periphery of the rotating brush 92 on the opposite side of the pair of rotating brushes 92 is the dust collecting electrode plate 48. It rotates so as to be opposite to the traveling direction. Therefore, the rotary brush 92 can remove the soot adhering to the surface (both sides) of the dust collecting electrode plate 48, and the removed soot is deposited on the lower end of the hopper 20 without being caught in the rotary brush 92 and the dust collecting electrode plate 48 again. Can be made.

  With the above arrangement, the moving dust collection electrode 46 goes around with the drive wheel 72 as the upper end and the lower wheel 90 as the lower end. On the other hand, the discharge electrode 54 has a lower end disposed above the lower unit 84 and an upper end disposed below the upper unit 66 in order to prevent negative ions from propagating to portions other than the moving dust collection electrode 46. . Therefore, it is difficult to effectively remove the dust from the exhaust gas that passes from the lower end of the lower unit 84 to the height position of the lower end of the discharge electrode 54. Furthermore, as in the present embodiment, the moving dust collection electrode 46 and the discharge electrode 54 may have a size higher than the dust collection electrode plate 48 of the fixed electrode type electrostatic dust collection device 28. Therefore, when the moving dust collection electrode 46 and the discharge electrode 54 are disposed in the casing 12 at the subsequent stage of the fixed electrode type electrostatic dust collector 28, the exhaust gas does not spread over the entire movement dust collection electrode 46 and the discharge electrode 54. There is.

  2 and 3, guide plates 94 are attached to both ends of the lower unit 84 on the exhaust gas flow path side. The guide plate 94 is disposed such that the lower end is connected to the hopper 20 and the upper end is substantially the same height as the lower end of the discharge electrode 54, and the exhaust gas flow path is blocked between the lower end and the upper end of the guide plate 94. Yes. Thereby, the exhaust gas that reaches the region lower than the lower end of the discharge electrode 54 in the exhaust gas flow path can be guided to a position higher than the lower end of the discharge electrode 54. Accordingly, the exhaust gas is prevented from passing through the region below the discharge electrode 54 (discharge electrode 55, see FIG. 14) of the moving dust collection electrode 46 where it is difficult to collect the dust, and the dust in the exhaust gas is effectively collected. can do. The guide plate 94 and the discharge electrode 54 are not in contact with each other. Thus, since the guide plate 94 is attached to the lower unit 84, the guide plate 94 can be easily installed.

  Further, as shown in FIG. 2, the fixed electrode type electrostatic precipitator 28 and the moving electrode type electrostatic precipitator 44 have the same structure as the gas distribution plate 24 described above, and serve as exhaust gas diffusing means. An inlet distribution plate 96 is arranged so that the exhaust gas flows uniformly into the moving electrode type electrostatic precipitator 44 (moving dust collecting electrode 46, discharge electrode 54). Further, an outlet distribution plate 98 having a structure similar to that of the inlet distribution plate 96 is also arranged on the downstream side of the exhaust gas of the moving electrode type electrostatic precipitator 44, and is sandwiched between the exhaust gas inlet distribution plate 96 and the outlet distribution plate 98. The flow rate in the region, that is, the portion of the exhaust gas that passes through the moving electrode type electrostatic precipitator 44 is suppressed so that dust can be efficiently collected.

  In the above configuration, the upper unit 66 and the lower unit 84 are grounded because they are connected to the casing 12, whereby the moving dust collecting electrode 46 connected to the upper unit 66 (drive wheel 72) and the lower unit 84 (lower wheel 90) is also provided. Grounded. On the other hand, the discharge electrode 54, the discharge electrode frame 56, and the discharge electrode frame support 58 are insulated from the casing 12 and applied with a negative high voltage. Accordingly, negative ions are released from the discharge electrode 54 in a direction intersecting the exhaust gas flow path, and propagate to the dust collection electrode plate 48 constituting the moving dust collection electrode 46. In this state, when the exhaust gas is carried in from the inlet flue 16, negative ions adhere to the soot in the exhaust gas that has passed through the fixed electrode type electrostatic precipitator 28, and the soot is negatively charged and adheres to the dust collecting electrode plate 48. By doing so, the dust in exhaust gas is removed. The exhaust gas from which the dust is removed is discharged from the exit flue 18.

  Further, when the dust collecting electrode plate 48 comes into contact with the rotating brush 92, dust adhering to the dust collecting electrode plate 48 is swept away by the rotating brush 92 and accumulated at the lower end of the hopper 20. And soot dust can be discharged | emitted from the casing 12 through the discharge port 22 provided in the hopper 20 lower end.

  The moving electrode type electrostatic precipitator 44 composed of the moving dust collecting electrode 46, the discharge electrode 54 and the like is arranged in a plurality of stages in the direction of the exhaust gas flow path in the casing 12, and the number of stages depends on the specification of the modification. Designed arbitrarily.

6 to 13 show a modification process of the electrostatic precipitator according to the first embodiment. Here, FIG. 6 is a front view. 7 to 13, (a) is a front view and (b) is a side view.
A case where the right fixed electrode type electrostatic dust collector 28 in the fixed electrode type electrostatic dust collector shown in FIG. 6A is replaced with a moving electrode type electrostatic dust collector 44 will be described. First, as shown in FIG. 6 (b), the hopper 20 directly under the fixed electrode type electrostatic precipitator 28 to be removed is removed to form a lower opening 64, and the fixed electrode type electric to be removed at the upper end of the casing 12 is formed. An upper opening 100 is formed at a position facing the dust collector 28. Then, the fixed electrode type electrostatic precipitator 28 is removed from the lower opening 64 or the upper opening 100 using a crane (not shown) or the like.

  Then, as shown in FIG. 6C, the extension member 82 and the tub tube chamber 60 are lifted using a crane (not shown) or the like and attached to a position surrounding the upper opening 100 on the casing 12. At this time, the insulator 62 and the discharge electrode frame support 58 are attached to the soot tube chamber 60 in advance. At this time, an inlet distribution plate 96 (and an outlet distribution plate 98 (not shown)) may be attached. Then, as shown in FIG. 6 (d), the upper unit 66 and the upper cover 74 are lifted using a crane (not shown) or the like and mounted on the soot tube chamber 60.

  Next, while disposing the discharge electrode frame 56 below the lower opening 64, as shown in FIG. 7, the wire 80 is fed out from the hoist 78 attached to the upper cover 74, and the wire 80 is inserted into the insertion hole 68 a and the upper opening. Insert through the part 100. Then, the wire 80 is attached to the discharge electrode frame 56 and lifted, and the discharge electrode frame 56 is carried from the lower opening 64. The discharge electrode frame 56 is connected to the discharge electrode frame support 58 by welding or the like.

  Then, the discharge electrode 54 is disposed below the lower opening 64, and as shown in FIG. 8, the wire 80 is drawn out from the hoist 78 in the same manner as described above to lift the discharge electrode 54, and the discharge electrode 54 is removed from the lower opening 64. Carry in. Then, the discharge electrode 54 is connected to the discharge electrode frame 56 by welding or the like. At this time, the operation of moving the hoist 78 appropriately on the rail 76 to lift the plurality of discharge electrodes 54 sequentially and connecting to the discharge electrode frame 56 at the lifted position is repeated.

  Next, a pair of moving dust collecting electrodes 46a in which the chain 52 is divided into two are arranged below the lower opening 64, and as shown in FIG. 9, a balance 78a is attached to the tip of the drawn-out wire 80, The balance 78a lifts the pair of moving dust collecting electrodes 46a, and carries the pair of moving dust collecting electrodes 46a from the lower opening 64. Then, as shown in FIG. 10, the moving dust collection electrode 46 a is lifted to a height exceeding the upper end of the drive wheel 72 attached to the upper unit 66. At this time, the pair of moving dust collecting electrodes 46 are lifted to positions facing each other with the drive wheel 72 interposed therebetween. Then, the chain 52 a is removed from the hoist 78 to connect the chains 52 a and engage with the drive wheel 72. At this time, the rotation of the rotary shaft 70 is locked so that the movable dust collecting electrode 46 does not fall off from the drive wheel 72.

  At this time, the hoist 78 is appropriately moved on the rail 76, the pair of moving dust collecting electrodes 46a are sequentially lifted, and the moving dust collecting electrodes 46a are connected when they are lifted. Thereby, the moving dust collection electrode 46 (discharge electrode 54) is arranged in a line in a direction perpendicular to the flow path of the exhaust gas.

  Then, the lower unit 84 is disposed below the lower opening 64, and the lower unit 84 is lifted through the balance 78 a by the hoist 78 as shown in FIG. 11, and the lower unit 84 is carried from the lower opening 64. Then, in a state where one of the pair of moving dust collecting electrodes 46a is inserted between the pair of rotating brushes 92 attached to the lower unit 84, the pair of moving dust collecting electrodes 46a face each other with the lower wheel 90 interposed therebetween. The lower unit 84 is lifted up to. Then, the chains 52a serving as the lower ends of the pair of moving dust collecting electrodes 46a are connected to form a chain 52 forming a loop and mesh with the lower wheel 90. Thereby, the moving dust collecting electrode 46 is disposed at a position facing the discharge electrode 54 in a state where a loop is formed as a whole by the plurality of dust collecting electrode plates 48. Further, the lower unit 84 is connected to the casing 12. At this time, the guide plate 94 is previously attached to the lower unit 84 before the lower unit 84 is lifted.

  Finally, the hopper 20 removed previously is disposed below the lower opening 64, and the hopper 20 is lifted by the hoist 78 through the balance 78a as shown in FIG. Then, as shown in FIG. 13, the remodeling process is completed by attaching the hopper 20 to the lower end of the casing 12 and sealing the lower opening 64. Although the hoist 78 remains after the remodeling, it can be used for subsequent maintenance work.

  Since the moving dust collecting electrode 46, the discharge electrode 54 and the like need not be lifted across the casing 12 by the above-described modification process, the large moving electrode type electrostatic dust collecting device 44 can be efficiently carried into the casing 12. it can. Further, since the discharge electrode 54 and the moving dust collecting electrode 46 are lifted by the hoist 78 supported by the casing 12, the moving electrode type electrostatic dust collecting device can be efficiently used even in the existing electric dust collecting device 10 in which it is difficult to secure a work space. 44 can be modified. Similarly, the hopper 20 can be easily lifted and the upper opening 100 can be easily sealed.

  In addition, since the hoist 78 that can move on the rail 76 is disposed on the upper cover 74, a large number of discharge electrodes 54 and moving dust collection electrodes 46 can be efficiently used even in the existing electric dust collector 10 in which it is difficult to secure a work space. Can be brought in.

  Further, since it is not necessary to lift the moving dust collection electrode 46 and the discharge electrode 54 so as to straddle the casing 12, the large moving electrode type electrostatic dust collector 44 can be efficiently carried into the casing 12. Further, by the above method, it is possible to effectively collect the dust in the exhaust gas by preventing the exhaust gas from passing through the region below the discharge electrode 54 of the moving dust collection electrode 46 where it is difficult to collect the dust.

  In this embodiment, a plurality of upper rollers 69 that support the moving dust collecting electrode 46 at the upper end are connected to the upper unit 66, and a plurality of lower rollers 87 that support the moving dust collecting electrode 46 at the lower end are connected to the lower unit 84. The upper unit 66 and the lower unit 84 are carried into the casing 12 corresponding to the position where the movable dust collection electrode 46 is installed. Accordingly, it is not necessary to examine the mounting position of each moving dust collection electrode 46 at the installation site, and the interference between the hoist 78 and the upper unit 66 can be avoided by the insertion hole 68a formed in the upper unit 66. A plurality of movable dust collection electrodes 46 can be easily attached.

  In the above modification process, a part (one stage) of the plurality of fixed electrode type electrostatic precipitators 28 has been described as being replaced with the moving electrode type electrostatic precipitator 44. You may apply when replacing the electrode-type electrostatic dust collector 28 with the moving electrode-type electrostatic dust collector 44. FIG. Further, in the remodeling process of carrying in the next moving electrode type electrostatic precipitator 44 next to the previously replaced moving electrode type precipitator 44, the moving electrode type precipitator 44 does not interfere with each other. In addition, they do not interfere with each other even after the remodeling process. Therefore, the fixed electrode type electrostatic precipitator 28 having a plurality of stages can be modified to replace the moving electrode type electrostatic precipitator 44 for each stage at the same time, and an efficient modification is possible. Therefore, the degree of modification of the electrostatic precipitator 10 can be changed according to the number of stages of the fixed electrode type electrostatic precipitator 28 to be removed.

  FIG. 14 and FIG. 15 are schematic views showing a modification process of the electrostatic precipitator according to the second embodiment. FIG. 14 (a) shows a process before remodeling, FIG. 14 (b) shows a process of carrying in a lower unit after removing a fixed electrode type electrostatic precipitator, and FIG. 14 (c) shows a process of carrying in a discharge electrode frame after installing a soot tube chamber. FIG. 14 (d) shows the step of carrying in the discharge electrode. 15A is the upper unit attaching process, FIG. 15B is the moving dust collecting electrode loading process (when suspended), and FIG. 15C is the moving dust collecting electrode loading process (immediately after hanging). FIG. 15D shows an upper cover attaching process.

  In the electric dust collector remodeling process of the second embodiment, the fixed electrode type electrostatic dust collector 28 is taken out from the upper part of the casing 12 without removing the hopper 20 and the moving electrode type electrostatic dust collector 44 is carried in. As shown in FIG. 14 (a), in the second embodiment, a description will be given of the case where the stationary electrode type electrostatic dust collector 28 in the latter stage of the fixed electrode type electrostatic dust collector 28 is replaced with a moving electrode type electrostatic dust collector 44. To do. First, as shown in FIG. 14B, an upper opening 100 is formed at a position facing the fixed electrode type electrostatic precipitator 28 to be removed of the casing 12, and the fixed electrode type electrostatic precipitator 28 to be removed is formed. It is lifted by a crane (not shown) and removed from the casing 12. Then, the lower unit 84 (with a guide plate 94) is lifted by a crane (main body not shown), is carried into the casing 12 from the upper opening 100, and is connected to the casing 12 at the lower portion of the casing 12.

  Next, as shown in FIG. 14 (c), the extension member 82 and the soot tube chamber 60 (with the discharge electrode frame support 58) are sequentially lifted by a crane (main body not shown) to a position surrounding the upper opening 100 at the top of the casing 12. The discharge electrode frame 57 is suspended by a crane (main body not shown), the discharge electrode frame 57 is carried in from the upper opening 100, and the discharge electrode frame 57 is connected to the discharge electrode frame support 58.

  And as shown in FIG.14 (d), the discharge electrode 55 is carried in from the upper opening part 100 using a crane (main body not shown), and is connected to the discharge electrode frame 57. FIG. Since a plurality of discharge electrodes 55 are arranged in a direction perpendicular to the direction of the exhaust gas flow path, the work of carrying in and connecting the discharge electrodes 55 is performed a plurality of times according to the number of discharge electrodes 55.

  Next, as shown in FIG. 15A, the upper unit 66 is lifted using a crane (main body not shown) and connected to the top tube chamber 60. Then, the moving dust collecting electrode 46 is suspended through a balance using a crane (main body not shown), and the moving dust collecting electrode 46 is inserted into the insertion hole 68 a and the upper opening 100 of the upper unit 66 and is carried into the casing 12. (FIG. 15B). At this time, as shown in FIG. 16, the moving dust collecting electrode 46 is carried to a position where it is engaged with a drive wheel 72 attached to the upper unit 66, and at the same time, two chains are formed by cutting the chain 52 at the lower end when suspended. It is suspended in the casing 12 in a state where 52a is formed. Then, as shown in FIG. 15 (c), the chain 52 at the upper end of the moving dust collection electrode 46 is engaged with the drive wheel 72.

  Finally, as shown in FIG. 15D, in a state where the chain 52a is engaged with the lower wheel 90, the chains 52a are connected to form the chain 52, and the upper cover 75 is suspended by a crane (not shown). The modification process is completed by lowering and connecting to the upper unit 66. This embodiment is an effective method when a place for installing a crane (main body not shown) is secured outside the casing 12 or when the moving dust collection electrode 46 to be carried in is small. Therefore, it is not necessary to attach the rail 76 or the hoist 78 to the upper cover 75. Further, the discharge electrode frame 57 and the discharge electrode 55 have the same functions as the discharge electrode frame 56 and the discharge electrode 54, respectively, but when they interfere with the end portion (or the soot tube chamber 60) of the upper opening 100, The dimensional design can be changed so that it can be carried in from the upper opening 100.

  By the above method, the fixed electrode type electrostatic dust collector 28 can be replaced with the moving electrode type electrostatic dust collector 44 constituted by the discharge electrode 55 and the movable dust collection electrode 46 in the existing casing 12. Since the upper unit 66 is formed with an insertion hole 68a, the movable dust collection electrode 46 can be efficiently casing without interfering with the upper unit 66 by inserting the movement dust collection electrode 46 into the insertion hole 68a. 12 can be carried in.

  FIG. 17 shows a modification of the electric dust collector of this embodiment. As described above, in the electrostatic precipitator 10, the fixed electrode electrostatic precipitator 28 is arranged in a plurality of stages in the direction of the flow path of the exhaust gas flowing through the casing 12 in the casing 12. In this modification, a part of the fixed electrode type electrostatic precipitator 28 (or all stages) may be removed, and the movable electrode type electrostatic precipitator 28 may be removed at the position where the fixed electrode type electrostatic precipitator 28 is removed. The apparatus 45 (moving dust collection electrode and discharge electrode) is attached.

  In the first embodiment and the second embodiment, it is assumed that the width in the direction of the exhaust gas flow path of the moving electrode type electrostatic precipitator 44 is substantially the same as the width of the fixed electrode type electrostatic precipitator 28. Have said. However, the width of the moving electrode type electrostatic precipitator 45 may be wider than that of the fixed electrode type electrostatic precipitator 28 as in the case of the modification. At this time, as shown in FIG. 17, at least two continuous stages of the fixed electrode type electrostatic precipitator 28 are removed, and the moving electrode type electrostatic precipitator 45 is disposed at the removed place. In FIG. 17, among the fixed electrode type electrostatic precipitator 28, three stages of fixed electrode type electrostatic precipitator 28 continuous along the exhaust gas flow path are removed, and the movable electrode type electric dust collector 28 is moved to the removed place. A dust collector 45 is provided. As a result, the electrostatic precipitator 10 according to the number of stages of the fixed electrostatic precipitator 28 to be removed and the dimension of the moving dust collector (moving electrode electrostatic precipitator 45) (width in the exhaust gas flow path direction). The degree of remodeling can be changed.

  Further, the moving electrode type electrostatic precipitator 45 is not installed immediately after the fixed electrode type precipitator 28 but may form a diffusion space 102 for promoting the diffusion of exhaust gas as shown in FIG. preferable. The inlet distribution plate 96 is preferably disposed in the diffusion space 102. Thereby, the flow path length necessary for diffusing the exhaust gas can be secured and the exhaust gas can be effectively diffused by the inlet distribution plate 96.

  The moving electrode type electrostatic precipitator 45 shown in FIG. 17 is basically the same as the structure of the moving electrode type electric precipitator 44 described in the first and second embodiments, although the width is different. Therefore, the constituent elements indicated by the reference numerals shown in FIG. 17 are the same as the constituent elements indicated by the same reference numerals shown in FIG. Since the moving electrode type electrostatic precipitator 45 can be carried into the casing 12 by the remodeling method of the first embodiment and the second embodiment, detailed description thereof is omitted. Thereby, these can be arrange | positioned in the casing 12 without being restricted by the width | variety of the movement dust collection electrode 46. FIG.

  Remodeling that can replace the fixed electrode type electrostatic precipitator with a moving electrode type precipitator composed of a discharge electrode and a moving precipitator in an existing casing that contains the fixed electrode type precipitator. It can be used as a method and an electrostatic precipitator manufactured by using this modification method.

10 ......... Electric dust collector, 12 ......... casing, 14 ......... post, 16 ......... inlet flue, 18 ...... exit flue, 20 ...... hopper, 22 ...... exhaust port, 24 ......... Gas distribution plate, 26 ......... Opening, 28 ......... Fixed electrode electrostatic precipitator, 30 ......... Discharge electrode, 32 ......... Discharge electrode frame, 32a ......... Beam, 34 ... …… Discharge electrode frame support, 36 ………… Insulator, 38 ……… Soot tube chamber, 40 ……… Charging equipment, 42 ……… Fixed dust collecting electrode, 44 ……… Moving electrode type electric dust collector, 45… …… Moving electrode type electrostatic precipitator, 46 ……… Moving dust collecting electrode, 46a ……… Moving dust collecting electrode, 48 ……… Dust collecting electrode plate, 50 ……… Connecting member, 52 ……… Chain, 52a ......... Chain, 54 ......... Discharge electrode, 55 ......... Discharge electrode, 56 ......... Discharge electrode frame, 57 ......... Release Pole frame, 56a ...... Beam, 58 ......... Discharge electrode frame support, 60 ......... Tube chamber, 62 ......... Insulator, 64 ......... Lower opening, 66 ......... Upper unit, 68 ......... Housing, 68a ... Insertion hole, 69 ... Upper roller, 70 ... Rotating shaft, 72 ... Drive wheel, 74 ... Upper cover, 75 ... Upper cover, 76 ... Rail 78 ......... Hoist, 78a ......... Balance, 80 ......... Wire, 82 ......... Extension member, 84 ......... Lower unit, 86 ......... Case, 87 ......... Lower roller, 88 ... ... rotating shaft, 90 ... lower wheel, 92 ... rotating brush, 94 ... guide plate, 96 ... inlet distribution plate, 98 ... outlet distribution plate, 100 ... upper opening, 102 ……… Diffusion space.

Claims (17)

  In the electrostatic precipitator in which the fixed electrode electrostatic precipitator is disposed in the casing, the fixed electrode electrostatic precipitator is replaced with a moving dust collecting electrode and a discharge electrode corresponding to the moving dust collecting electrode. Remodeling method of electrostatic precipitator. The fixed electrode type electrostatic precipitator is:
A plurality of stages are arranged in the direction of the flow path of the exhaust gas flowing through the casing in the casing,
After removing the fixed electrode type electrostatic precipitator at some or all of the fixed electrostatic precipitator, the movable dust collecting electrode and the position at which the fixed electrode precipitator is removed The method for remodeling an electrostatic precipitator according to claim 1, wherein the discharge electrode is attached. Removing the hopper at the position facing the fixed electrode type electrostatic precipitator at the lower end of the casing to form a lower opening;
Arranging a hoist at a position facing the lower opening of the casing;
The method for remodeling an electrostatic precipitator according to claim 1 or 2, wherein the movable dust collecting electrode and the discharge electrode are lifted by the hoist and carried from the lower opening. A housing having an insertion hole communicating with the lower opening, and an upper end of the moving dust collecting electrode supported in the insertion hole in a state arranged in a direction perpendicular to a flow path of exhaust gas flowing through the casing An upper unit having a plurality of upper rollers to be supported is disposed at a position between the hoist and the lower opening,
A lower unit having a plurality of lower rollers arranged to face the upper roller and supporting the lower end of the moving dust collecting electrode is lifted by a wire that is drawn out from the hoist and inserted through the insertion hole, and is lifted from the lower opening. The method for remodeling an electrostatic precipitator according to claim 3, wherein the method is carried in.   The method for remodeling an electrostatic precipitator according to claim 3 or 4, wherein the hopper is lifted by the hoist to seal the lower opening. At the position facing the insertion hole on the upper unit, it is attached to a rail having a longitudinal direction in a direction perpendicular to the flow path of the exhaust gas passing through the casing,
The hoist is attached to the rail so as to be movable along the rail, and the moving dust collecting electrode is lifted,
6. The plurality of moving dust collecting electrodes are arranged in a direction perpendicular to the flow path of the exhaust gas by repeatedly moving the hoist and lifting a new moving dust collecting electrode. A method for remodeling the electrostatic precipitator according to any one of the preceding claims. Forming an upper opening at a position facing the fixed electrode electrostatic precipitator at the upper end of the casing;
A lower unit having a plurality of lower rollers supported in a state of being arranged in a direction perpendicular to a flow path of exhaust gas flowing through the casing and having a plurality of lower rollers supporting the lower end of the moving dust collecting electrode is carried from the upper opening and the casing. Placed in the
An upper unit having a plurality of upper rollers supported in a state of being arranged so as to face the lower roller and supporting the upper end of the moving dust collecting electrode is disposed at a position facing the upper opening on the casing. The method for remodeling an electrostatic precipitator according to claim 1 or 2. The upper unit has an insertion hole communicating with the upper opening and the upper roller is supported in the insertion hole.
The method for remodeling an electrostatic precipitator according to claim 7, wherein the movable dust collecting electrode is carried from the insertion hole.   9. The electrostatic precipitator according to claim 1, wherein an extension casing is disposed at a position facing the upper opening on the casing to extend an upper end of the casing. Remodeling method.   The guide plate for guiding the exhaust gas reaching the region lower than the lower end of the discharge electrode in the exhaust gas flow path to a position higher than the lower end of the discharge electrode is disposed. Section 1 shows how to modify the electrostatic precipitator. A casing through which exhaust gas flows;
A fixed electrode type electrostatic precipitator disposed on the upstream side of the flow path of the exhaust gas in the casing;
A moving dust collecting electrode disposed around the exhaust gas flow path and connected to form a loop as a whole by a plurality of connected dust collecting electrodes; and
A discharge electrode disposed at a position facing the moving dust collection electrode;
A guide plate disposed in a region lower than the lower end of the discharge electrode of the exhaust gas flow path, and guiding the exhaust gas reaching the region to a position higher than the lower end of the discharge electrode. Dust collector. The moving dust collecting electrode is
A plurality of lower rollers that are arranged in a direction perpendicular to the flow path and support the lower end of each moving dust collecting electrode are supported by the lower unit,
The electrostatic precipitator according to claim 11, wherein the guide plate is attached to the lower unit.   13. The electrostatic precipitator according to claim 11 or 12, wherein an exhaust gas diffusing unit is disposed between the fixed electrode type electrostatic precipitator and the movable dust collector. The fixed electrode type electrostatic precipitator is:
A plurality of stages are arranged in the direction of the flow path of the exhaust gas flowing through the casing in the casing,
The moving dust collecting electrode is
The fixed electrode type electrostatic precipitator is attached to a position where the fixed electrode type electrostatic precipitator is removed from some or all of the fixed electrode type electrostatic precipitators. The electric dust collector modification method of description. The fixed electrode type electrostatic precipitator is:
A plurality of stages are arranged in the direction of the flow path of the exhaust gas flowing through the casing in the casing,
The width of the moving dust collection electrode is:
Formed wider than the width of the fixed electrode type electrostatic precipitator,
The moving dust collecting electrode is
14. The fixed electrode type electrostatic precipitator, wherein the fixed electrode type electrostatic precipitator of at least two successive stages is attached to a position where it is removed. The electrostatic precipitator according to 1. A diffusion space for diffusing exhaust gas is formed between the moving dust collecting electrode and the fixed electrode type electrostatic dust collecting device,
The electric dust collector according to claim 15, wherein the exhaust gas diffusing unit is disposed in the diffusion space.   The upper opening is formed at a position of the upper end of the casing facing the moving dust collecting electrode, an extension casing is disposed at a position of the casing facing the upper opening, and the upper end of the casing extends. The electrostatic precipitator according to claim 11, wherein the electrostatic precipitator is provided.

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