JP2008279405A - Bag type dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag type dust collector capable of preventing the damage caused by wear of a bag filter. <P>SOLUTION: The bag type dust collector 1 in which the inside of a housing 2 is vertically partitioned by a partition wall 3 to form a dust-containing air introducing chamber 4 to a lower part and to a cleaned air chamber 5 to an upper part, a plurality of cylindrical bag filters F are attached to the partition wall 3, and dust-containing air is introduced from the lower side of the bag filters F is characterized in that the bag filters F are provided with a cylindrical body 20 for covering the lower end peripheral part of the bag filters F to form an air reservoir 24 below the bag filters F. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bug type dust collector, and more particularly to wear countermeasures for the bag filter of a bag type dust collector that introduces exhaust gas from below a suspended bag filter.

In general, a bug type dust collector is used to collect dust in exhaust gas discharged from a garbage incinerator or an electric furnace for incinerating household garbage.
Then, when a large amount of dust adheres to the bag filter and the ventilation resistance (pressure loss) exceeds a predetermined value or after a certain period of time has elapsed, a backwash condition for blowing off the dust is selected and pressure air is blown out. The means of backwashing is taken.

As shown in FIGS. 4 to 6, the bug type dust collector 1 includes a housing 2 that is divided into upper and lower portions by a partition wall 3, a lower portion is a dust-containing air introduction chamber 4, and an upper portion is a purified air chamber 5. The dust air introduction chamber 4 is connected to a dust generation source (not shown), and the purified air chamber 5 is connected to a suction device 7.
The partition wall 3 has a snap ring in which a large number of bottomed bag-shaped bag filters F ′ are included in the upper portion of the bag filter F ′ with respect to the mounting bracket 55 disposed in the bag filter mounting hole of the partition wall 3. It is attached by the spreading force of S.
Further, a bag filter cage 50 is disposed inside the bag filter F ′ in order to maintain the cylindrical shape of the bag filter F ′.

  As shown in FIG. 6, the bag filter cage 50 includes a large number of support bars 51 having a length over the entire length of the bag filter F ′, and a support attached to an intermediate position in order to hold the support bar 51 at a predetermined diameter. A ring 52 and a bottom plate 53 are provided, and the upper end of the support bar 51 is attached below an annular cage plate or a backwash venturi 54.

A cleaning air supply pipe 8 for cleaning is provided for each row of the bag filters F ′, and a pressure air jet nozzle 9 for jetting pressure air is attached to each bag filter F ′.
The cleaning air supply pipe 8 is connected to a main pressure air supply pipe 11 via a regulating valve 10.

As a result, the exhaust gas containing dust from the dust generation source by the suction force of the suction device 7 is normally guided to the dust-containing air introduction chamber 4 through the inlet 4a, and the dust is filtered by the bag filter F ′. Thus, the purified air is discharged through the purified air chamber 5.
Next, when dust accumulates on the outer peripheral surface of the bag filter F ′ and the ventilation resistance (pressure loss) exceeds a predetermined value or after a predetermined time has elapsed, the adjustment valve 10 such as a diaphragm valve is operated for a short time. The pressure air in the main pressure air supply pipe 11 is instantaneously discharged to the cleaning air supply pipe 8, and the cleaning air for cleaning is bugged from the pressure air jet nozzles 9 arranged for each row of the cleaning air supply pipe 8. The dust sprayed into the filter F ′ and adhered to the outer peripheral surface of the bag filter F ′ is blown off (see, for example, Patent Document 1).

By the way, the bag filter F ′ used in the bag type dust collector 1 has a bottomed cylindrical shape, and when the exhaust gas introduced into the dust-containing air introduction chamber 4 is introduced from below, as shown in FIG. Flows like an arrow Y and collides with the bottom surface and the lower side surface of the bag filter F ′.
In this case, in the bag filter F ′ close to the exhaust gas inlet 4a, the exhaust gas having a reduced flow velocity tends to be sucked into the bag filter F ′ when it hits the inner wall of the housing 2 or the rectifying plate (not shown). In the bag filter F ′ at a location far from the exhaust gas inlet 4a (in the vicinity of the range A in FIG. 5), the exhaust gas is high-speed with respect to the bottom surface and the lower side surface of the bag filter F ′. It tends to hit directly from diagonally below.

Although the degree varies depending on the properties of the exhaust gas to be introduced, the exhaust gas contains a lot of powder, and the contained powder particularly places at a location away from the exhaust gas inlet 4a, which is susceptible to direct hits. The bottom surface and the lower side surface of the installed bag filter F ′ will be worn.
As a result, there is a problem that a hole is generated in the bag filter F ′, and the exhaust gas flows into the purified air chamber 5 without being filtered by the bag filter F ′.
JP 2004-351323 A

  An object of the present invention is to provide a bag type dust collector capable of preventing damage due to wear of a bag filter in view of the problems of the conventional bug type dust collector.

  In order to achieve the above object, the bag type dust collector of the present invention divides the interior of the housing vertically by a partition wall, the lower part is a dust-containing air introduction chamber, the upper part is a purified air chamber, and the partition wall has a number of In a bug type dust collector in which a cylindrical bag filter is attached and dust-containing air is introduced from the lower side of the bag filter, the bag filter covers the lower end periphery of the bag filter so as to form an air pocket below the bag filter. It is characterized by disposing a cylindrical body.

  In this case, a partition plate can be formed on the cylinder.

  Further, the cylindrical body can be held by a snap ring disposed at the lower part of the bag filter.

  According to the bag type dust collector of the present invention, the lower part of the bag filter is protected by disposing the cylindrical body that covers the lower end periphery of the bag filter and forms an air reservoir below the bag filter. At the same time, the flow of exhaust gas can be made to follow the surface of the bag filter, and the direct impact of the exhaust gas to the lower part of the bag filter is mitigated by the cylinder and the air reservoir formed by the cylinder, and the wear of the bag filter Can prevent damage.

  Moreover, the bottom face of a bag filter can be closed with a partition plate by forming a partition plate in a cylinder.

  In addition, by holding the cylinder with a snap ring provided at the lower part of the bag filter, the cylinder can be attached by a simple operation similar to the method for attaching the upper part of the bag filter to the mounting bracket provided on the partition wall. Can be held.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a bug type dust collector of the present invention will be described based on the drawings. In addition, about the structure similar to a conventional apparatus, the same code | symbol and a series of code | symbol are attached | subjected, and description is abbreviate | omitted.

  1 to 2 show a first embodiment of the bug type dust collector of the present invention.

  In the bug type dust collector 1, as in the conventional apparatus, the interior of the housing 2 is partitioned vertically by a partition wall 3, the lower part is a dust-containing air introduction chamber 4, and the upper part is a purified air chamber 5. Is connected to a dust generation source (not shown) via an inlet 4 a, and the purified air chamber 5 is connected to a suction device 7. A large number of cylindrical bag filters F are suspended and attached to the partition wall 3, and each bag filter F is provided with a cleaning air supply pipe 8 for cleaning in each row. A pressure air jet nozzle 9 for jetting is attached. The cleaning air supply pipe 8 is connected to a main pressure air supply pipe 11 via a regulating valve 10.

The bag-type dust collector 1 is a metal cylinder that covers the lower periphery of the bag filter F, forms an air reservoir 24 below the bag filter F, and has a partition plate 23 in the middle, more specifically. Is arranged with a cylindrical cylinder 20 composed of an upper cylinder 21 and a lower cylinder 22 provided with a partition plate 23.
Here, the cylindrical body 20 covers the lower end peripheral portion of the bag filter F where the exhaust gas directly hits, and further downward, about 0.5 to 3 times the diameter of the bag filter F, preferably 1.0 to 2 times. The air reservoir 24 is formed on the inner side by forming it so as to have a certain length.

Further, the bag filter F used in the bag type dust collector 1 uses a cylindrical cloth filter cloth whose upper and lower ends are open because the bottom surface of the bag filter F is closed by the partition plate 23, and the upper and lower ends. Both are provided with a folded portion, and a snap ring S that exerts a biasing force in the expanding direction on the folded portion (overlapping portion) is disposed.
This has an advantage that the bag filter F can be easily manufactured.

The snap ring S disposed on the upper portion of the bag filter F is for attaching the bag filter F to the mounting bracket 55 disposed in the bag filter mounting hole of the partition wall 3 as in the conventional example.
Further, as shown in FIG. 1, the snap ring S disposed at the lower portion of the bag filter F is an upper cylinder body provided with a partition plate 23 among the upper cylinder body 21 and the lower cylinder body 22 constituting the cylinder body 20. The cylindrical body 20 is held by its expanding force in contact with the inner peripheral surface 21a of the member 21.
And it is preferable that the inner peripheral surface 21a of the upper cylindrical body 21 with which the snap ring S abuts bends the upper edge portion inward to form a catching portion of the snap ring S.

  In addition, the attachment method of the cylinder 20 is not limited to the thing of a present Example, It is attached so that dust-containing air may prevent directly entering into the purified air chamber 5 without being filtered by the bag filter F. For example, the cloth filter cloth may be attached from the outer peripheral side of the cylindrical body 20 using an arbitrary fixing tool such as a stainless steel fixing band.

As shown in FIG. 1A, the cylindrical body 20 is integrated by fixing a lower cylindrical body 22 to a bottom surface of the upper cylindrical body 21 including the partition plate 23, that is, a bottom surface of the partition plate 23 by welding. I am doing so.
In addition, as shown in FIG.1 (b), the cylinder 20 can also be fixed by welding, after attaching the upper cylinder 21 provided with the partition plate 23 in the lower cylinder 22, and can also be integrated, The shape and manufacturing method are not limited to those of the examples.
In this case, it is preferable that the outer diameter of the cylinder 20 is substantially equal to the outer diameter of the bag filter F.

  In the above configuration, the flow of the exhaust gas introduced into the dust-containing air introduction chamber 4 from the introduction port 4a disposed below the bag type dust collector 1 is located away from the exhaust gas introduction port 4a (see FIG. 2). In the lower part of the range A) in FIG. 5, the exhaust gas flows in the same X direction as in the conventional case, but the exhaust gas hits the cylindrical body 20 disposed in the lower peripheral portion of the bag filter F, and the flow direction is on the surface of the bag filter F. Rectified in the direction of X ′ along.

Even if there is exhaust gas flowing into the inner surface of the cylinder 20, the bottom surface of the bag filter F is covered with the partition plate 23. The exhaust gas does not flow back into the purified air chamber 5 without being filtered back and filtered.
As a result, the exhaust gas does not directly hit the lower portion of the bag filter F from an oblique direction, and damage due to wear of the bag filter F can be prevented.

  FIG. 3 shows a second embodiment of the bug type dust collector of the present invention.

  The bag type dust collector 1 has the same configuration as that of the first embodiment, and the cylinder body 20 attached to the lower end peripheral portion of the bag filter F is partitioned into an inner peripheral surface of an intermediate portion of the cylinder body 20 as shown in FIG. The plate 23 is fixed by welding.

And in this bug type dust collector 1, the snap ring S arrange | positioned under the bag filter F is made to contact | abut to the inner peripheral surface 20a of the upper part of the cylinder 20, and the cylinder 20 which attached the partition plate 23 is made into a bug filter. F is held.
And it is preferable that the inner peripheral surface 20a of the cylindrical body 20 with which the snap ring S abuts bends the upper edge portion inward to form a catching portion of the snap ring S.

  Accordingly, the partition plate 23 is fixed to the inner peripheral surface of the intermediate portion of the cylindrical body 20 by welding, and the cylindrical body 20 is easily manufactured by performing a process of bending the upper edge portion of the cylindrical body 20 inward. be able to.

  The other configuration and operation of the present embodiment are the same as those of the first embodiment.

By the way, in each said Example, although the partition plate 23 was attached to the cylinder 20, when using a bottomed cylindrical bag filter, the partition plate 23 can also be abbreviate | omitted. Even if the partition plate 23 is omitted, the cylinder 20 protects the lower peripheral portion of the bag filter and allows the exhaust gas to flow along the surface of the bag filter. Can be mitigated by the cylinder 20 and the air reservoir 24 formed by the cylinder 20, and damage due to wear of the bag filter can be prevented.
In addition, the cylindrical body 20 (and the partition plate 23) can be made of a synthetic resin or FRP in addition to the metal described in the present embodiment.

As mentioned above, although the bug type dust collector of the present invention has been described based on the embodiment, the present invention is not limited to the configuration described in the above embodiment, and the configuration is appropriately changed without departing from the spirit of the present invention. It is something that can be done.
In the above-described embodiment, as shown in FIG. 2, all the bag filters F are provided with the cylindrical body 20 that covers the lower peripheral portion of the bag filter F and forms the air reservoir 24 below the bag filter F. Although it is provided, the cylinder 20 is provided only in the bag filter F at a location where the exhaust gas is easy to hit at a high speed and obliquely downward from the bottom surface and the lower side surface of the bag filter F (for example, in the vicinity of the range A in FIG. 5). However, the present invention does not exclude this.

  Since the bug type dust collector of the present invention has a characteristic that damage due to wear of the bag filter can be prevented, the bag type dust collector can be suitably used for a bug type dust collector having a high exhaust gas flow velocity, and a general bug. It can also be widely used for a dust collector.

The 1st Example of the bag filter used for the bag type dust collector of this invention is shown, (a) is a front view of a partial cross section, (b) is a front view of the partial cross section which shows the modification of a cylinder. It is a front view of the partial cross section of the bag type dust collector of this invention. It is a front view of the partial cross section which shows 2nd Example of the bag filter used for the bag type dust collector of this invention. It is a front view of the partial cross section of the conventional bug type dust collector. The ZZ sectional view of Drawing 4 is shown. It is a front view of the partial cross section which shows the bag filter used for the conventional bug type dust collector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bug type dust collector 2 Housing | casing 3 Compartment wall 4 Dust-containing air introduction chamber 5 Purified air chamber 20 Cylinder 21 Upper cylinder 22 Lower cylinder 23 Partition plate F Bag filter S Snap ring

Claims (3)

  The inside of the housing is partitioned vertically by a partition wall, the lower part is a dust-containing air introduction chamber, the upper part is a purified air chamber, a number of cylindrical bag filters are attached to the partition wall, and the dust-containing air is In the bug type dust collector introduced from the lower side, the bag type dust collector is characterized in that the bag filter is provided with a cylindrical body that covers a lower peripheral portion of the bag filter so as to form an air reservoir below the bag filter. .   The bag type dust collector according to claim 1, wherein a partition plate is formed on the cylindrical body.   3. The bag type dust collector according to claim 1, wherein the cylindrical body is held by a snap ring disposed at a lower portion of the bag filter.

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