JP7094755B2 - Electrostatic precipitator - Google Patents

Description

The present invention relates to an electrostatic precipitator. More specifically, the present invention relates to an electric dust collector having a higher gas sealing performance between a dust collecting electrode chamber and an insulator chamber than before.

In an electrostatic precipitator, the insulator that supports the release electrode to which a 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 the insulator room, and avoids 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 that rises from the dust collecting electrode chamber and enters the insulator chamber, and even if a small amount of exhaust gas flows in, dust to the insulator will continue for a certain period of time. Insulation defects may occur due to the adhesion of the insulator, and stable charging may not be possible.

Japanese Unexamined Patent Publication No. 2009-1602

An object of the present invention is to provide an electric dust collector having a gas sealing performance between a dust collecting electrode chamber and an insulator chamber further improved as compared with the conventional case.

The present inventors have a case where the insufficiency of the airtightness of the penetrating insulator itself that supports the suspension rod installed by connecting the dust collecting electrode chamber and the insulator chamber is the cause of the exhaust gas inflow. We found that the above problems could be solved by improving the airtightness of the insulator itself, which had been overlooked until then, and completed the present invention. Specifically, the present invention provides the following.

(1) A dust collecting electrode chamber containing a dust collecting electrode, an insulator chamber arranged above the dust collecting electrode chamber, and a part of the lower end side of the insulator chamber fixedly installed in the insulator chamber. Is exposed to the outside of the insulator chamber, a substantially circular tower-shaped penetrating insulator, one end is supported by the penetrating insulator, and the other end is inserted into the dust collecting electrode chamber. An electric dust collector including a rod-shaped suspension rod, wherein the dust collecting electrode chamber and the insulator chamber are arranged apart from each other, or through a structure capable of blocking the airflow between the two chambers. The hanging rod is supported by the penetrating insulator in a manner of penetrating the penetrating insulator, and the penetrating insulator has an inner diameter substantially the same as the outer diameter of the hanging rod. A shaped insulator is fixed to the bottom surface of the penetrating insulator by bringing the seat and the inner edge of the packing into close contact with the outer edge of the suspension rod via a resin packing having substantially the same shape as the insulator in plan view. Insulator.

According to the electrostatic precipitator of (1), the gas sealing performance between the dust collecting electrode chamber and the insulator chamber can be further improved as compared with the conventional case.

(2) The washer on the bottom surface side is screwed to a plurality of rod-shaped bolt members suspended inside the penetrating insulator and fixed to the top surface of the penetrating insulator. Electrostatic precipitator.

According to the electrostatic precipitator of (2), since the packing such as silicon rubber is used, the insulator can be screwed with sufficient tightening strength without damaging the penetrating insulator. Therefore, the electricity according to (1). The gas sealing performance between the dust collecting electrode chamber and the insulator chamber in the dust collector can be further improved. In addition, by adopting such a structure for mounting the washer and packing, the strength of the mounting portion is extremely high, and replacement work such as when the washer and packing have reached the end of their useful life as a sealing material is necessary. Can be easily done.

(3) The electrostatic precipitator according to (1) or (2), wherein the washer on the bottom surface side is formed by joining two semicircular parts in a manner of sandwiching the suspension rod.

The electrostatic precipitator of (3) has a configuration suitable for additionally imparting a gas seal structure peculiar to the present invention to an existing electrostatic precipitator, thereby utilizing the basic structural portion of the existing electrostatic precipitator (3). When remodeling to the electrostatic precipitator according to 1) or (2), the ease and work efficiency of the remodeling work are remarkably improved.

(4) In the through insulator, a washer having an inner diameter substantially the same as the outer diameter of the suspension rod is placed on the insulator and the packing via a resin packing having substantially the same shape in plan view as the washer. The electrostatic dust collector according to any one of (1) to (3), wherein the inner edge is brought into close contact with the outer edge of the suspension rod and is fixed to the top surface of the penetrating washer.

According to the electrostatic precipitator of (4), the gas sealing performance between the dust collecting electrode chamber and the insulator chamber in the electrostatic precipitator according to any one of (1) to (3) can be further significantly improved.

According to the present invention, it is possible to provide an electric dust collector having a gas sealing performance between a dust collecting electrode chamber and an insulator chamber further improved as compared with the conventional case.

It is sectional drawing which shows the schematic structure of the electrostatic precipitator of this invention. It is a perspective view which shows the schematic structure of the inside of the dust collection electrode chamber of the electrostatic precipitator of FIG. FIG. 3 is a partially enlarged cross-sectional view for explaining the gas seal structure between the dust collecting electrode chamber and the insulator chamber in the electrostatic precipitator of FIG. 1. FIG. 3 is a perspective view of a penetrating insulator according to the present invention constituting the gas seal structure of FIG.

<Basic structure of electrostatic precipitator>
FIG. 1 is a cross-sectional view showing a schematic configuration of the electrostatic precipitator of the present invention. Further, FIGS. 1 (A) and 1 (B) are cross-sectional views of the electrostatic precipitators 10 when viewed from different directions substantially at right angles to each other. As shown in these figures, the electrostatic precipitator 10 is composed of an upper casing 111, a dust collecting electrode 122 that also functions as a side casing, a lower casing 113, and a frame 114, which form a main part of the external structure thereof.

Further, the upper casing 111, the dust collecting electrode 122, and the lower casing 113 are combined in this order from above to form a housing of the electrostatic precipitator 10. This housing is referred to as a "dust collecting electrode chamber 200" in the present specification. In the electrostatic precipitator 10, the dust collecting electrode chamber 200 is arranged apart from the insulator chamber 100 arranged above the dust collecting electrode chamber 100, or is adjacent to the electrostatic precipitator chamber 10 via a structure capable of blocking the air flow between the two chambers. Have been placed. The structure capable of blocking the airflow between the two chambers is sufficient as long as it is a sealing structure having desired airtightness according to the type of gas handled by each device, for example, an air seal structure that blocks the airflow by air pressure. There may be.

The dust collecting electrode chamber 200 is fixed by a frame 114 so as to be separated upward by a predetermined distance from the ground. As the material of the dust collecting electrode chamber 200, conductive FRP (Fiber Reinforced Plastics), stainless steel, or carbon steel can be used.

FIG. 2 is a perspective view showing a schematic configuration of the inside of the dust collecting electrode chamber 200. As shown in this figure, the inside of the dust collecting electrode chamber 200 includes an upper grid 121, a dust collecting electrode 122, a lower grid 123, a suspension rod 2, a discharge line 124, a weight 126, an upward spray nozzle 127, and a cleaning pipe. 128, a downward spray nozzle 129 is provided.

The upper grid 121, the dust collecting pole 122, and the lower grid 123 are arranged so as to be substantially parallel to each other in the horizontal direction, separated from each other by a predetermined distance in this order from above.

The dust collecting electrode 122 is configured by repeatedly and continuously arranging a plurality of "chambers" with a square cylinder as a unit (hereinafter, such a unit is referred to as a "chamber"). Specifically, hereinafter, of the substantially horizontal directions, one direction is referred to as "vertical direction", and the direction perpendicular to the vertical direction is referred to as "horizontal direction". In this case, N units are repeatedly and continuously arranged in the vertical direction, and M units are repeatedly and continuously arranged in the horizontal direction (hereinafter referred to as "N × M") to collect dust. The pole 122 is configured. It should be noted that N and M are arbitrary integer values independent of each other, and in the case of the example shown in FIG. 2, the number of "chambers" of the dust collecting electrode 122 is N × M = 9 × 9. .. The size of the chamber is not particularly limited, but one example is a square tube having sides having a length of 30 to 50 cm. As the material of the dust collecting electrode 122, conductive FRP can be preferably used.

The discharge electrode corresponding to such a dust collecting electrode 122 is composed of a discharge line 124. The discharge line 124 is suspended from the upper grid 121 and is arranged so as to penetrate the central interior of the predetermined "chamber" of the dust collecting electrode 122 in a substantially vertical direction. The discharge line 124 is connected to a weight 126 provided at the upper part of the lower grid 123 so as to have enough tension not to loosen.

A DC high voltage (charged voltage) of a negative electrode supplied from a power supply device (not shown) is directly applied to the suspension rod 2. On the other hand, a DC high voltage of the negative electrode is applied to the discharge line 124 via the upper grid 121. In the present embodiment, the suspension rod 2 is joined to the upper grid 121 and arranged as a rod for suspending the suspension rod 2. However, the suspension rod 2 penetrates the dust collecting electrode chamber 200 and also functions as an electrode rod. The structure may be joined to the lower grid 124123 and further suspended thereof.

The upward spray nozzle 127 is arranged above the four corners of each "chamber" of the dust collecting electrode 122, and ejects the cleaning water flowing through the cleaning pipe 128 as a fine mist in a substantially vertical upward direction. This makes it possible to clean and remove fine particles such as mist and dust adhering to the dust collecting electrode 122.

In the electrostatic precipitator 10, the washing water is ejected from the upward spray nozzle 127 in a substantially vertical upward direction as a fine mist. As a result, the dispersion of the washing water is improved, so that the amount of washing water used can be reduced as compared with the amount of water conventionally used. The upward spray nozzle 127 also contributes to an increase in the DC high voltage of the negative electrode applied to the suspension rod 2 and the discharge line 124.

<Gas seal structure>
The electrostatic precipitator 10 has a gas seal structure that blocks the inflow of exhaust gas from the dust collecting electrode chamber 200 to the insulator chamber 100 by a penetrating insulator 1 to which a special structure for improving airtightness is provided. It is characterized by.

As described above, in the electrostatic precipitator 10, the dust collecting electrode chamber 200 and the insulator chamber 100 are arranged apart from each other or adjacent to each other via a structure capable of blocking the air flow between the two chambers. Has been done. The substantially cylindrical penetrating insulator 1 is fixed inside the insulator chamber 100, and a part of the lower end side thereof is exposed to the outside (lower part) of the insulator chamber 100.

Here, since the conventional penetrating insulator has not been given special consideration for the airtightness of itself, for example, some gas seal as described above between the insulator chamber 100 and the dust collecting electrode chamber 200 is used. Even if the structure exists, the through insulator itself, which has a hollow structure inside, may become a gas flow path. More specifically, the fine gap around the hole through which the suspension rod 2 penetrates was the main gas flow path. On the other hand, in the electrostatic precipitator 10 of the present invention, the penetrating insulator 1 is characterized in that it has a structure capable of sufficiently blocking the flow of such gas.

[Penetrating insulator and hanging rod]
As shown in FIG. 4, the penetrating insulator 1 covers at least the bottom surface side of the circular tower-shaped main body 11 in order to block the gas flow at the peripheral edge of the through hole into which the suspension rod 2 is inserted. Then, the donut-shaped washer 12B is fixed to the bottom surface of the penetrating insulator 1 by means such as bolting via the resin packing 13B.

The washer 12B and the packing 13B are installed so as to surround the circumference of the suspension rod 2 in such a manner that the inner edge thereof is brought into close contact with the outer edge of the suspension rod 2. Thereby, the flow of gas in this portion can be sufficiently blocked, and the gas sealing property can be further improved by further applying a known caulking treatment to this portion.

The washer 12B is a donut-shaped metal member having an inner diameter substantially the same as the outer diameter of the suspension rod 2. For example, if it is made of stainless steel and satisfies the above conditions regarding shape and size, a general-purpose product can be used as it is. The same applies to the packing 13, and a packing made of silicon rubber or the like can be appropriately selected and used.

Further, the washer 12B and the packing 13 may preferably be in the form of being divided into two semicircular parts at the stage before installation on the penetrating insulator 1. The existing two-divided form is used, and the suspension rod 2 is sandwiched between these parts from the outside, and then these parts are joined to form a washer 12B and installed. Also in the electrostatic precipitator, the gas seal structure of the present invention is additionally added without removing the suspension rod 2 from the penetrating insulator 1 temporarily or removing various members joined to the lower portion of the suspension rod 2. Can be granted. The "two semicircular parts" may be a member having a shape obtained by cutting the washer 12B and the packing 13 laminated on the washer 12 in half, and the other, in the present invention, as the washer and the packing. A member having a ring-shaped member capable of exerting a function and having a shape divided along the center line in a plan view can be appropriately used.

The through-insulator 1 of the washer 12B that meets the packing 13B can be fixed to the bottom surface of the main body 11 by fixing a plurality of places of the washer 12B to the bottom surface of the main body 11 by bolting. Further, the washer 12B is fixed by a method of fixing it to the top surface of the through insulator 1 as shown in FIG. 3 and screwing it to the rod-shaped bolt member 17 hanging inside the washer 12 with a nut 15. More preferred.

Further, it is preferable that a donut-shaped washer 12A is firmly attached to the penetrating insulator 1 on the top surface side thereof as well as on the bottom surface side via a resin packing 13A. In this case, as for the washer 12B and the resin packing 13B, the same ones as those on the bottom surface side can be used. These fixing methods are the same as those on the bottom surface side, but for the washer 12A on the top surface side and the resin packing 13A, as shown in FIG. 3, a screw structure is formed near the upper end portion of the suspension rod 2. However, it is also possible to have a structure in which the nut 14 is directly screwed to this portion. The caulking process and the like are the same as those on the bottom surface side.

Then, as shown in FIG. 3, the penetrating insulator 1 fixes the flange portion 16 projecting outward from the outer edge of the main body 11 in a flange shape around the fixing hole through which the penetrating insulator main body is penetrated on the bottom surface of the insulator chamber 100. As a result, a part of the main body 11 on the lower end side of the flange portion 16 is inserted into the dust collecting electrode chamber 200, and is fixedly installed in the insulator chamber 100. It is preferable to perform a gas sealing treatment such as a caulking treatment on the periphery of the hole into which the main body 11 of the penetrating insulator 1 is inserted.

Then, as shown in FIGS. 3 and 4, the suspension rod 2 is supported by the penetrating insulator 1 in a manner of penetrating the penetrating insulator 1 along the central axis of the circular tower-shaped penetrating insulator 1.

[Effect of gas seal structure in electrostatic precipitator]
As described above, the electrostatic precipitator 10 improves the airtightness of the joint portion between the penetrating insulator 1 and the suspension rod 2, so that the gas flow through the cavity inside the insulator, which has been overlooked in the conventional electrostatic precipitator. Can be blocked.

The present invention is a gas sealing means widely applicable to electrostatic precipitators having a structure in which a dust collecting electrode is supported by a porcelain and hangs down. In these electrostatic precipitators, by implementing various conventional gas sealing means implemented without using a porcelain as a constituent requirement and the gas sealing means of the present invention in combination as necessary, conventionally. The gas sealing performance for preventing the inflow of exhaust gas into the porcelain chamber 100 in these dust collectors can be significantly improved by compensating for the shortcomings of the gas sealing means.

1 Penetrating insulator 11 Main body (Main body of penetrating insulator)
12 (12A, 12B) Washer 13 (13A, 13B) Packing 14, 15 Nut 16 Flange 17 Bolt member 2 Suspended rod 10 Electrostatic collector 111 Upper casing 113 Lower casing 114 Frame 121 Upper grid 122 Dust collector 123 Lower grid 124 Release Electric wire 126 Weight 127 Upward spray nozzle 128 Cleaning piping 129 Downward spray nozzle 100 Flange room 200 Dust collection electrode room

Claims (3)

The dust collecting pole room containing the dust collecting pole and
The insulator room located above the dust collection electrode room and
A substantially circular tower-shaped penetrating insulator, which is fixedly installed in the insulator chamber and a part of the lower end side thereof is exposed to the outside of the insulator chamber.
One end is supported by the penetrating insulator, and the other end is a rod-shaped hanging rod inserted into the dust collecting electrode chamber.
It is an electrostatic precipitator equipped with
The dust collecting electrode chamber and the insulator chamber are arranged apart from each other, or are arranged adjacent to each other via a structure capable of blocking the air flow between the two chambers.
The suspension rod is supported by the penetrating insulator in a manner of penetrating the penetrating insulator.
On the through insulator, a donut-shaped washer having an inner diameter substantially the same as the outer diameter of the suspension rod is placed on the insulator and the packing via a resin packing having substantially the same shape as the washer in a plan view. The inner edge is brought into close contact with the outer edge of the suspension rod and fixed to the bottom surface of the penetrating washer .
One end is fixed to the top surface of the penetrating insulator and hangs inside the penetrating insulator, and the other end is the other of a plurality of rod-shaped bolt members penetrating the packing and the washer. An electrostatic dust collector in which the washer is fixed to the bottom surface of the penetrating insulator via the packing by tightening a nut screwed to the end side . The electrostatic precipitator according to claim 1 , wherein the washer on the bottom surface side is formed by joining two semicircular parts in a manner of sandwiching the suspension rod. In the penetrating insulator, a washer having an inner diameter substantially the same as the outer diameter of the suspension rod is placed on the washer and the inner edge of the packing via a resin packing having substantially the same shape in plan view as the washer. The electrostatic dust collector according to claim 1 or 2 , which is in close contact with the outer edge of the suspension rod and is also fixed to the top surface of the penetrating washer.

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