JP7163139B2 - electric dust collector - Google Patents

Description

The present invention relates to an electrostatic precipitator. More specifically, it relates to an electrostatic precipitator with improved gas sealing performance between a dust collection electrode chamber and an insulator chamber.

In an electrostatic precipitator, the insulator that supports the discharge electrode to which high voltage is applied is separated from the dust collection electrode chamber by a gas seal structure (a structure that maintains airtightness between the two chambers) provided to prevent the passage of exhaust gas. It is placed in an insulator room where the dust collector is placed to avoid contact with the exhaust gas to be treated inside the electrostatic precipitator (see Patent Document 1).

However, it is still difficult to completely shut off the exhaust gas rising from the dust collecting electrode chamber and entering the insulator chamber, and even if the inflow of exhaust gas is slight, if it continues for a certain period of time, dust will enter the insulator. Insulation failure due to adhesion may occur, and stable charging may not be possible.

JP-A-2009-1602

An object of the present invention is to provide an electrostatic precipitator with improved gas sealing performance between a dust collecting electrode chamber and an insulator chamber.

The inventors of the present invention have found that inadequate airtightness of the penetrating insulator that supports the suspension rod installed connecting the dust collection electrode chamber and the insulator chamber may cause the inflow of exhaust gas. The present inventors have found that the above problem can be solved by improving the airtightness of the insulator itself, which has been overlooked until then, to a sufficiently high level, and have completed the present invention. Specifically, the present invention provides the following.

(1) A dust collection electrode chamber containing a dust collection electrode and a dust collection electrode chamber disposed above the dust collection electrode chamber with a space therebetween, or adjacent to each other via a structure capable of blocking an air flow between the two chambers. an insulator chamber; a substantially cylindrical through insulator fixed in the insulator chamber and partially exposed to the outside of the insulator chamber on the lower end side thereof; and a columnar suspension rod supported by the through insulator in a manner penetrating through the through insulator and having the other end inserted into the dust collection electrode chamber, wherein: One ring-shaped elastic sealing member and a second ring-shaped elastic sealing member are provided, wherein the first ring-shaped elastic sealing member is wound around the suspension rod and formed on the through insulator. The second ring-shaped elastic sealing member is installed in a state of being compressed and deformed between the inner peripheral surface of the through hole for inserting the suspension rod and the outer peripheral surface of the suspension rod, and the second ring-shaped elastic seal member is inserted into the suspension rod. The gap between the inner peripheral portion of the opening of the suspension rod insertion through-hole and the outer peripheral portion of the suspension rod facing the inner peripheral portion. An electrostatic precipitator installed in a state of being pressure-contacted to

In the electrostatic precipitator of (1), elastic sealing members are installed in different manners in a plurality of places in the gap space around the cylindrical suspension rod, which is assumed to be the inflow path of the exhaust gas into the insulator chamber. there is As a result, the gas sealing performance between the dust collecting electrode chamber and the insulator chamber can be improved to an extremely high level. In addition, the arrangement of the elastic seal members can reduce the risk that the elastic seal members will be damaged or deteriorated at the same time. Furthermore, since the elastic sealing member has a simple installation structure in which it is installed by winding it around a suspension rod, it is easy to replace it, and is excellent in maintainability. As described above, according to the electric dust collector of (1), the exhaust gas rising from the dust collection electrode chamber and entering the insulator chamber can be cut off stably over a long period of time with high accuracy.

(2) The electrostatic precipitator according to (1), wherein the first ring-shaped elastic sealing member is an O-ring.

In the electric dust collector of (2), an "O-ring", which is also a general-purpose sealing material, is used as the first ring-shaped elastic sealing member. Thereby, the gas seal performance in the electrostatic precipitator described in (1) can be improved to extremely high accuracy. Also, by replacing it at appropriate intervals, it is possible to stably maintain such a high level of gas sealing performance over a long period of time.

(3) The electrostatic precipitator according to (1) or (2), wherein the elastic material forming the first ring-shaped elastic seal member is fluororubber.

In the electric dust collector of (3), the elastic material forming the first ring-shaped elastic sealing member is selected from various combustible materials containing hydrogen, etc., which have particularly excellent heat resistance and oil resistance among synthetic rubbers. A fluororubber that has sufficient resistance to toxic gases was also specified. As a result, the above effects that can be achieved by the electrostatic precipitator of (1) or (2) can be applied to a wider range of fields for processing various high-temperature gases, exhaust gas containing oily dust, and combustible gases. Even when applied to industrial equipment, it can be enjoyed stably.

(4) The second ring-shaped elastic seal member is a seal washer comprising a washer portion made of a metallic annular member and a sealing lip portion made of an annular elastic member thicker than the washer portion. , an electrostatic precipitator according to any one of (1) to (3).

In the electric dust collector of (4), a "seal washer" made of a metallic annular base material and an annular elastic member is used as the second ring-shaped elastic sealing member. Thereby, the gas seal performance in the electrostatic precipitator according to any one of (1) to (3) can be improved to extremely high accuracy. Also, by replacing it at appropriate intervals, it is possible to stably maintain such a high level of gas sealing performance over a long period of time.

ADVANTAGE OF THE INVENTION According to this invention, the electrostatic precipitator which improved the gas-sealing performance between a dust collection electrode chamber and an insulator chamber can be provided. Moreover, this gas seal performance can be stably maintained over a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows schematic structure of the electrostatic precipitator of this invention. FIG. 2 is a perspective view showing a schematic configuration inside a dust collection electrode chamber of the electric dust collector of FIG. 1; 2 is a partially enlarged cross-sectional view for explaining a gas seal structure between a dust collection electrode chamber and an insulator chamber in the electric dust collector of FIG. 1. FIG. FIG. 4 is a perspective view of a through insulator according to the present invention that constitutes the gas seal structure of FIG. 3; 4 is a partially enlarged cross-sectional view for further detailed description of the gas seal structure of FIG. 3. FIG. 6 is a partially enlarged cross-sectional view of a portion indicated by a in FIG. 5; FIG. 1A and 1B are a plan view and a cross-sectional view of a first ring-shaped elastic seal member constituting a gas seal structure according to the present invention; FIG. FIG. 4 is a cross-sectional view of a second ring-shaped elastic seal member that constitutes the gas seal structure according to the present invention;

<Basic structure of electric dust collector>
FIG. 1 is a cross-sectional view showing a schematic configuration of an electrostatic precipitator of the present invention. 1(A) and 1(B) are cross-sectional views of the electrostatic precipitator 10 viewed from different directions substantially perpendicular to each other. As shown in these figures, the main part of the external structure of the electrostatic precipitator 10 is composed of an upper casing 111 , a dust collection electrode 32 that also functions as a side casing, a lower casing 112 , and a frame 114 .

The upper casing 111, the dust collecting electrode 32, and the lower casing 112 are combined in this order from above to form a housing of the electrostatic precipitator 10. As shown in FIG. This housing is referred to in this specification as a "dust collection electrode chamber (dust collection electrode chamber 200)". In the electrostatic precipitator 10, the dust collection electrode chamber 200 is separated from the insulator chamber 100 disposed thereabove, or is separated from the insulator chamber 100 by a structure capable of blocking the airflow between the two chambers. are placed next to each other. Also, the dust collection electrode chamber 200 is fixed by a frame 114 so as to be separated from the ground by a predetermined distance. As a material for such a dust collection electrode chamber 200, conductive FRP (Fiber Reinforced Plastics), stainless steel, carbon steel, or the like can be used.

FIG. 2 is a perspective view showing a schematic configuration inside the dust collection electrode chamber 200. As shown in FIG. As shown in this figure, the interior of the dust collection electrode chamber 200 includes an upper grid 31, a dust collection electrode 32, a lower grid 33, a suspension rod 2, a discharge wire 34, a weight 35, an upward spray nozzle 36, and a cleaning pipe. 37, downward spray nozzles 38 are provided. The upper grid 31, the dust collecting electrode 32, and the lower grid 33 are arranged in this order from above so as to be substantially parallel to each other in the horizontal direction, separated from each other by a predetermined distance.

As shown in FIG. 3, the suspension rod 2 is supported by the through insulator 1 in such a manner that it passes through the central axis of the through insulator 1 having a columnar shape. A negative DC high voltage (charging voltage) supplied from a power supply (not shown) is directly applied to the suspension rod 2 . On the other hand, the DC high voltage of the negative electrode is applied to the discharge line 34 via the upper grid 31 . In this embodiment, the suspension rod 2 is joined to the upper grid 31 and arranged as a rod for suspending it. The structure may be such that it is joined to the lower grid 33 and further suspended.

In the electrostatic precipitator 10 having the above-described basic structure, the substantially cylindrical through-hole insulator 1 is fixed inside the insulator chamber 100, and a part of the lower end side thereof is outside (lower portion) of the insulator chamber 100. exposed to Therefore, if the airtightness of the structural portion including the through insulator and the suspension rod penetrating the through insulator is insufficient as in the prior art, the internal space of the through insulator, which is basically a hollow structure, will become a dust collecting electrode. There is a risk of becoming a gas flow path from the chamber 200 to the insulator chamber 100 . On the other hand, in the electrostatic precipitator 10 of the present invention, by installing a "gas seal structure" having a configuration unique to the present invention in the through insulator 1, the above gas flow path can be maintained with high accuracy and for a long period of time. It cuts off stably over a period of time. Details of this "gas seal structure" will be described below.

<Gas seal structure of electric dust collector>
As shown in FIGS. 5 and 6, the gas seal structure of the electrostatic precipitator 10 is such that a first ring-shaped elastic seal member 13 and a second ring-shaped elastic seal member 16 seal the cylindrical main body 11 of the through insulator 1. It is formed in the vicinity of the central portion on the upper surface portion side. This gas seal structure is constructed by winding two types of ring-shaped elastic members having different shapes and functions at different vertical positions of the hanging rod 2 . Each of these ring-shaped elastic members is configured in a different manner so as to fill a gap that can be a gas flow path in each part inside the suspension rod insertion through-hole 121 and in the vicinity of the opening thereof. . This gas seal structure, which will be described in detail below, is a simple structure that is excellent in maintainability. can be shut off under

[First ring-shaped elastic seal member]
As shown in FIGS. 5 and 6, the first ring-shaped elastic sealing member 13, which is one of the two types of ring-shaped elastic members, is mounted on the inner peripheral surface of the suspension rod insertion through-hole 121. and the outer peripheral surface of the hanging rod 2 while being pressed from both sides, so that it is installed in a state of being compressed and deformed. As a result, the first ring-shaped elastic seal member 13 closes the gap between the two surfaces and cuts off the flow of gas in this portion.

As the elastic seal member forming the first ring-shaped elastic seal member 13, an "O-ring" made of an elastic material such as various synthetic rubbers can be preferably used. As shown in FIG. 7, the "O-ring" is a sealing member which is an endless ring made of elastic material and having a substantially circular cross section. As the first ring-shaped elastic sealing member for constructing the gas seal structure of the electrostatic precipitator 10, an "O-ring" having an inner diameter substantially the same as the outer diameter of the suspension rod 2 can be preferably used.

Moreover, among various "O-rings", an "O-ring" made of fluororubber can be particularly preferably used. By selecting fluororubber, which is excellent in terms of heat resistance and resistance to various combustible gases, as the material for the first ring-shaped elastic seal member 13, the electrostatic precipitator 10, which treats combustible gases, can be used for a longer period of time. Gas sealing performance can be stably expressed.

More specifically, as shown in FIG. 6, the first ring-shaped elastic seal member 13 represented by an "O-ring" has an opening in the center of the upper plate 12 that constitutes the upper surface of the through insulator body. It is wound around the suspension rod 2 in a state of being fitted in the interior of the sealing member housing groove 132 formed in the inner peripheral surface of the suspension rod insertion through hole 121 formed as a through hole. As shown in FIG. 6, it is preferable that the upper portion of the sealing member housing groove portion 132 is sealed by the restraining plate 14 fixed to the upper plate 12 by the bolts 15 . In this case, when the deterioration of the first ring-shaped elastic seal member 13 progresses, it can be easily replaced by removing the retaining plate 14 .

In addition, in the space above and below the first ring-shaped elastic seal member 13 fitted inside the seal member accommodation groove portion 132 , there is a space for stability of the first ring-shaped elastic seal member 13 inside the seal member accommodation groove portion 132 . In order to increase the resistance, it is preferable that a backup material 131 made of a weather-resistant resin such as polytetrafluoroethylene (PTFE) is embedded in such a manner as to fill the space of the seal member housing groove 132 .

As also shown in FIG. 6, the first ring-shaped elastic seal member 13, when its original cross-sectional shape is circular like an O-ring, has an elliptical shape with the axial direction of the suspension rod 2 as its major axis. It is preferable that the sealing member housing groove 132 is fitted into the sealing member housing groove portion 132 in a deformed state. In this state, due to its elastic stress, the first ring-shaped elastic seal member 13 is applied with a uniform and sufficiently large pressure over the entire circumference of the contact surface, and the suspension rod insertion through-hole 121 is closed. It is pressed against the inner peripheral surface and the outer peripheral surface of the hanging rod 2 . Therefore, in this state, the first ring-shaped elastic sealing member 13 can maintain the airtightness between the two surfaces with high accuracy.

[Second ring-shaped elastic seal member]
On the other hand, as shown in FIG. 5, the second ring-shaped elastic sealing member 16, which is the other one of the two types of ring-shaped elastic members, is provided outside the through hole 121 for inserting the hanging rod. It is installed in a state of being pressed against the gap between the inner peripheral portion of the opening of the rod insertion through-hole 121 and the outer peripheral portion of the suspension rod 2 facing this portion. As a result, the second ring-shaped elastic sealing member 16 seals the gap between the two parts to block the flow of gas.

The second ring-shaped elastic seal member 16 includes a washer portion 161 which is a metallic annular base material and an annular elastic member having a thickness (W ₂ ) greater than the thickness (W ₁ ) of the washer portion 161. It is preferable to use a "sealing washer" integrated with a sealing lip portion 162 formed by sharing an opening. As shown in FIG. 8, the "sealing washer" has a sealing lip portion 162 that is axially pressed against a washer portion 161 and elastically deformed to contribute to an improvement in airtightness. A sealing member characterized by being formed as follows. A “sealing washer” having an inner diameter substantially equal to the outer diameter of the hanging rod 2 can be preferably used as the second ring-shaped elastic sealing member for configuring the gas seal structure of the electrostatic precipitator 10 .

More specifically, as shown in FIG. 5, the second ring-shaped elastic sealing member 16 has an opening in the center of the top plate 12 that constitutes the top surface of the through insulator body and has a certain thickness. It is wound around the hanging rod 2 so as to cover the periphery of the opening of the through hole 121 for inserting the hanging rod formed as a through hole along the direction. The second ring-shaped elastic seal member 16 is further pressed against the top plate 12 with sufficiently strong pressure by a tightening mechanism consisting of a washer 17A, a spring 18, a washer 17B, and a nut 19. In particular, when the second ring-shaped elastic seal member 16 is a sealing washer having the structure described above, the sealing lip portion 162 elastically deformed by the tightening described above is elastically applied to the entire pressed contact portion. It is pressed against it with a uniform and sufficient pressure. Therefore, in this state, the second ring-shaped elastic sealing member 16 can maintain the airtightness between the two parts with high accuracy.

As shown in FIG. 4, the through insulator 1 has a gas seal structure for blocking gas flow at the periphery of the through hole into which the suspension rod 2 is inserted, even on the lower surface side of the cylindrical main body 11. It is more preferable to be formed. As the gas seal structure on the lower surface side, for example, a doughnut-shaped washer covering the perimeter portion is fixed to the bottom surface of the through insulator 1 through a resin packing by means of bolting or the like. A preferred example is a gas seal structure.

In the through insulator 1, as shown in FIG. 3, a flange portion 113 protruding outward from the outer edge of the main body 11 in a flange shape is fixed around a fixing hole through which the through insulator main body penetrates in the bottom surface of the insulator chamber 100. As a result, the body 11 is fixed in the insulator chamber 100 in such a manner that a part of the main body 11 on the lower end side of the flange portion 113 is inserted into the dust collection electrode chamber 200 . It is preferable to perform gas sealing treatment such as caulking treatment also around the hole into which the main body 11 of the through insulator 1 is inserted.

[Action and effect of gas seal structure in electrostatic precipitator]
As described above, the electrostatic precipitator 10 is provided with a unique gas seal structure comprising two ring-shaped elastic seal members, so that the through insulator 1 and the suspension rod 2 installed through it are separated. Airtightness at the abutting portion is remarkably improved. As a result, the flow of gas passing through the inner space of the insulator, which has been overlooked in conventional electrostatic precipitators, can be cut off with high and stable airtightness.

In addition, in this gas seal structure, elastic seal members are installed in different manners at a plurality of different locations that are assumed to be gas flow paths, so that the elastic seal members are damaged or deteriorated at different times. The risk is extremely low, and the electrostatic precipitator can be operated safely over a long period of time by systematically performing replacement work for each elastic seal member at an appropriate time.

Further, the present invention is a gas seal means that can be widely applied to an electrostatic precipitator having a structure in which a dust collecting electrode is supported by an insulator and hangs down. In these electrostatic precipitators, various conventional gas seal means formed in portions other than the insulator and the gas seal means of the present invention are appropriately combined as needed to realize a conventional gas seal. By compensating for the shortcomings of the means, it is possible to remarkably improve the gas seal performance for preventing exhaust gas from flowing into the insulator chamber 100 in these electrostatic precipitators.

1 through insulator 11 main body (main body of through insulator)
REFERENCE SIGNS LIST 111 upper casing 112 lower casing 113 flange portion 114 frame 12 upper plate 121 suspension rod insertion through hole 13 first ring-shaped elastic seal member 131 backup material 132 sealing material storage groove 14 holding plate 15 bolt 16 second ring-shaped elastic Seal member 161 Washer portion 162 Sealing lip portion 17 (17A, 17B) Washer 18 Spring 19 Nut 2 Hanging rod 31 Upper grid 32 Dust collection electrode 33 Lower grid 34 Discharge wire 35 Weight 36 Upward spray nozzle 37 Cleaning pipe 38 Downward spray Nozzle 10 Electric dust collector 100 Insulator chamber 200 Dust collection electrode chamber

Claims (5)

a dust collection electrode chamber containing the dust collection electrode;
an insulator chamber disposed above the dust collection electrode chamber with a space therebetween, or adjacently disposed via a structure capable of blocking an airflow between the two chambers;
a substantially circular column-shaped through insulator fixed in the insulator chamber and partly exposed on the lower end side thereof to the outside of the insulator chamber;
a cylindrical suspension rod having one end supported by the through insulator in a manner penetrating the through insulator and the other end inserted into the dust collection electrode chamber;
An electrostatic precipitator comprising
comprising a first ring-shaped elastic sealing member and a second ring-shaped elastic sealing member,
The first ring-shaped elastic sealing member is an annular O-ring having an inner diameter substantially equal to the outer diameter of the suspension rod, and is opened at the center of the upper plate forming the upper surface of the through insulator. The suspension rod is wound around the suspension rod in a state of being fitted in the seal member storage groove formed in the inner peripheral surface of the suspension rod insertion through hole, and the suspension rod formed on the through insulator Between the inner surface of the sealing member housing groove in the insertion through hole and the outer peripheral surface of the suspension rod, the sealing member is installed in a state of being compressed and deformed into an elliptical shape with the axial direction of the suspension rod as the major axis. and
The second ring-shaped elastic seal member is wound around the suspension rod outside the suspension rod insertion through-hole, and the inner peripheral portion of the opening of the suspension rod insertion through-hole and the inner periphery The electrostatic precipitator installed in a state of being pressed against the gap between the outer peripheral portion of the suspension rod facing the portion. A part of the lower end of the through insulator exposed to the outside of the insulator chamber is inserted into the dust collection electrode chamber.
The electrostatic precipitator according to claim 1. The upper side of the seal member housing groove is sealed by a restraining plate fixed to the top plate with a bolt,
The electrostatic precipitator according to claim 1 or 2. The electrostatic precipitator according to any one of claims 1 to 3 , wherein the elastic material forming said first ring-shaped elastic seal member is fluororubber. The second ring-shaped elastic seal member is a seal washer comprising a washer portion made of a metallic annular member and a sealing lip portion made of an annular elastic member having a thickness greater than that of the washer portion. 5. The electrostatic precipitator according to any one of 1 to 4 .

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