JPH1190142A - Bag filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact bag filter capable of being pulse-cleaned with one pulse valve, with the nozzle precisely positioned with respect to a thimble, excellent in maintainability and with the cost of a dust discharge mechanism lowered. SOLUTION: The upper end of a thimble is fixed in the hole of a gas partition plate 4 provided at the upper part in a cylindrical casing 2, a nozzle holder 6 having the nozzles corresponding to a specified number of thimbles 3 is arranged above the partition plate 4, and high-pressure air is injected from the respective nozzles from above the thimble to release the dust depositing on the outer face of the thimble in the bag filter 1. The partition plate 4 is divided into the sectors having a specified central angle with the longitudinal axis of the casing 2 as the center, the nozzle holder 6 has a sectorial or isosceles triangular shape corresponding to the sector in plan, and the nozzles of the holder 6 are arranged in accordance with the arrangement of the thimbles in the sectors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filter device, and more particularly to a bag filter device of a vertical external filtration type.

[0002]

2. Description of the Related Art Conventionally, as a type of dust collector for collecting and removing dust and harmful substances contained in waste gas and the like, a dust collecting action is performed by passing through a filter cloth material (bag filter) supported by a filter tube. The so-called bag filter device is generally well known. For example, in the cement industry and the steel industry, as a dust collector for air at room temperature or waste gas at a relatively low temperature (for example, about 80 ° C. or less). , Has been widely adopted. In particular, in recent years, improvements in filter cloth materials have made it possible to apply even to a relatively high temperature range. Have been.

[0003] Further, since the dust collection performance is not affected by the high dust collection efficiency and the type of coal, a bag filter device can be used instead of a conventional electric dust collector for, for example, waste gas of a coal-fired power generation boiler. Has been adopted. Furthermore, even in incinerators for general municipal garbage and the like, bag filters with high dust collection performance have been adopted in place of electric dust collection devices in order to cope with the regulation of dioxin emission.

[0004] The types of the bag filter devices are broadly classified into an internal filtration type and an external filtration type when classified according to the filter structure and the filtration method. A cage is inserted into the filter cylinder of the bag filter. In the case of the external filtration type, the filtration speed is 2
It can be set to more than double. Therefore, even with the same dust collection performance, the size of the apparatus can be reduced accordingly, and the installation area can be reduced. For this reason, at present, a bag filter device of an external high-speed filtration type using a nonwoven fabric as a bag filter occupies the mainstream.

[0005]

By the way, in the case of a bag filter device using a nonwoven fabric on the outer surface and high-speed filtration, when dust collected on the outer surface of the filter cloth of the filter is peeled off, conventionally, it is provided on the upper part of the filter tube. A cleaning method is generally used in which high-pressure air is injected from a nozzle toward a venturi tube above a filter tube to generate a pulse jet that induces secondary air, and the pulse jet removes dust. However, in the case of this method, since the backwashing method uses the mass (volume) of air, the air consumption is large, and the filter tube cannot be made long, so that the apparatus becomes large and the installation area increases. There is.

On the other hand, there is known a pulse pressure wave type bag filter device in which high pressure air is ejected from an air nozzle provided in a nozzle holder as a strong pulse pressure wave toward a filter tube to separate dust. Have been. In this type, the bag filter attached to the filter tube instantly expands due to the blast air pressure wave generated during pulse cleaning,
The dust adhering to the outer surface of the filter tube is peeled off by the impact force.

As a bag filter device adopting the pulse cleaning system using the pulse pressure wave, for example, Japanese Patent Application No. 63-318496 according to the invention of the present inventor has disclosed a bag filter device.
In Japanese Patent Application Laid-Open No. Hei 2-164411 (hereinafter referred to as a conventional publication), as shown as one of the prior arts (see FIGS. 14 and 15), a large number of rectangular mounting tube plates 101 are provided. Filter tubes 102 are arranged neatly vertically and horizontally,
The nozzle pipes 103 are arranged one by one on the filter tubes in each row, and the base end of each nozzle pipe 103 is connected to the air receiver 105 via the pulse valve 104 to perform pulse cleaning. , Nozzle pipe fixed type (hereinafter, referred to as prior art 1)
It has been known. However, in this case, since the pulse valve 104 is required for each nozzle pipe,
The required number of valves 104 increases. For this reason, the equipment cost increases, and when air leakage (air leakage) occurs in any of the pulse valves 104, it is difficult to specify which valve is leaking. Further, when replacing the filter cloth, it is necessary to remove and reattach the nozzle pipe 103 each time. In particular, when the temperature of the waste gas is high, it is inconvenient to wait until the temperature drops.

Further, as disclosed in the above-mentioned conventional publication (see FIGS. 16, 17 and 18), a large number of filter tubes 1 are provided.
The movable type that performs cleaning by moving one (FIG. 16) or two (FIGS. 17 and 18) nozzle pipes 113 with respect to the nozzle 12 (hereinafter referred to as Conventional Technique 2) is described above. Although the disadvantage of the prior art 1 can be solved, in this case, since there is a considerable distance difference between the filter tubes 112 which are located diagonally in the filter tube array, the nozzle 1
There is a difference in the injection pressure due to the high pressure air from 13n, and it is generally difficult to obtain a uniform cleaning effect. Further, each nozzle 113n is connected to the corresponding filter cylinder 112.
It is most important to accurately position the nozzle 113n, but a positioner (not shown) that positions the nozzle 113n
Is placed at room temperature outside the apparatus, while the filter tube 112 is located in the casing 116, so that it tends to be misaligned due to thermal expansion due to high temperature gas, and it is generally difficult to accurately position the filter tube 112. Furthermore, not only is the mechanism for moving the nozzle pipe 113 complicated, but also these mechanisms must be installed at the top of the casing 116 and cannot be placed on the ground, which is disadvantageous in terms of maintenance.

Further, as shown as another prior art in the above-mentioned conventional publication (see FIGS. 19 and 20), a large number of filter tubes 122 are radially arranged and arranged above them. A so-called nozzle pipe rotating type in which pulse cleaning is performed while rotating the nozzle pipe 123 (hereinafter referred to as conventional technology 3).
However, in this case, the nozzle pipe 123
Is relatively simple, but since the filter tubes 122 are arranged radially, the interval becomes larger on the outer peripheral side and the dead space becomes wider. Also, the nozzle pipe 123
It is necessary to stop rotation by the number of filter tubes 123 arranged on the outermost semicircle, and the number of times the pulse valve operates increases,
There is a problem that the life is adversely affected.

By the way, after being collected by the bag filter,
A so-called hopper type is generally used as a method of collecting dust separated from the filter and discharging the dust to the outside of the apparatus. In this type, in order to collect dust smoothly,
It is necessary to set the gradient of the hopper to a certain value or more (for example, a vertex angle of 60 degrees or less). For this reason, there is a problem that the height of the entire apparatus is inevitably increased. Further, in the case of this type, a rotary valve driven by a motor provided with a reduction gear mechanism is usually attached to a lower portion of the hopper as a discharge device for discharging dust collected by the hopper to the outside of the device. There is also the problem that the device and its electrical wiring and control devices are very expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables pulse cleaning with a single pulse valve, accurate positioning of a nozzle with respect to a filter tube, excellent operability and maintainability, and an apparatus of the present invention. It is a basic object of the present invention to provide a bag filter device capable of suppressing the height and discharging dust with a relatively inexpensive mechanism.

[0012]

For this reason, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) comprises a cylindrical casing having an exhaust gas inlet, an exhaust gas outlet, and a dust outlet. A gas partition plate attached to an upper portion of the casing and separating a purified region and an unpurified region of exhaust gas, and a plurality of filter tubes having upper ends fixed to holes provided in the gas partition plate and extending downward. Having a nozzle corresponding to a predetermined number of filter cylinders among the plurality of filter cylinders, including a nozzle holder located above the gas partition plate and connected to a high-pressure air supply source; A vertical outer surface filtration type bag filter device in which high-pressure air is injected from above the filter tube to separate dust attached to the outer surface of the bag filter of the filter tube, wherein the gas partition plate extends along the longitudinal axis of the casing. Center and And the nozzle holder is formed into a sector shape or an isosceles triangle shape corresponding to the sector in a plan view. Are characterized by being arranged corresponding to the arrangement of the filter tubes in each sector of the gas partition plate.

Further, the invention according to claim 2 of the present application (hereinafter referred to as “the invention”)
According to a second aspect of the present invention, in the first aspect, the nozzle holder is rotatably supported around a longitudinal axis of the casing, and is rotated by a predetermined angle, so that the gas partition plate is It is characterized in that it is positioned at a position corresponding to above each sector.

Further, the invention according to claim 3 of the present application (hereinafter referred to as “the invention”)
According to a third aspect of the present invention, in the second aspect, the nozzle holder bends from the direction substantially parallel to the gas partition plate in the direction along the longitudinal axis of the casing at the rotation center of the nozzle holder.
A curved tube portion of 0 ° is provided, and a portion of the curved tube portion along the casing longitudinal axis is rotatably supported by a bearing.

Further, the invention according to claim 4 of the present application (hereinafter referred to as a fourth invention) is characterized in that, in the third invention, the lower end side of the curved pipe portion extends along the longitudinal axis of the casing and rotates. A freely supported straight pipe portion is provided, the nozzle holder is rotated about the straight pipe portion as a rotation axis, and high-pressure air is supplied to the nozzle holder via the straight pipe portion and the curved pipe portion. It is characterized by that.

Further, in the invention according to claim 5 of the present application (hereinafter, referred to as a fifth invention), in the fourth invention, a lower portion of the straight pipe portion projects downwardly of the casing, and A driving plate is fixed, and by rotating the driving plate by a predetermined angle, the nozzle holder is rotated by a predetermined angle via the straight pipe portion, and each of the gas partition plates is rotated. It is characterized in that it is positioned at a position corresponding to above the sector.

Further, the invention according to claim 6 of the present application (hereinafter referred to as a sixth invention) is characterized in that, in the first invention, one straight line is provided between the straight pipe portion and the high-pressure air supply source. And a diaphragm-type control valve that communicates with a pressure chamber that controls the opening and closing of the valve element.

Further, the invention according to claim 7 of the present application (hereinafter, referred to as a seventh invention) is characterized in that, in the first invention, the exhaust gas unpurified area below the gas partition plate in the casing is provided. One end communicates with the exhaust gas inlet, and the other end is abutted against the gas partition plate, and a dust-containing gas distribution cylinder is provided extending along the longitudinal axis of the casing, and is provided above a predetermined height of the dust-containing gas distribution cylinder. The portion is provided with a plurality of holes for allowing the dust-containing gas to flow into the surrounding filter tube.

Further, in the invention according to claim 8 of the present application (hereinafter, referred to as an eighth invention), in the first invention, the bottom of the casing is formed substantially flat, and the casing is provided on a bottom plate of the casing. It is characterized in that a rotary scraper that rotates about the longitudinal axis of the casing and scrapes dust on the bottom plate is provided.

Further, in the invention according to claim 9 of the present application (hereinafter referred to as ninth invention), in the eighth invention, an opening is formed at a predetermined portion of the casing bottom plate, and A discharge duct that opens to the outside of the casing is attached to the opening, and upper and lower two-stage open / close dampers are provided in the discharge duct. These upper and lower open / close dampers close the upper damper in a normal state where dust is not discharged. On the other hand, when the lower damper is opened and the rotary scraper approaches the opening, the rotary
In conjunction with the rotation of the scraper, the upper damper is opened, the lower damper is closed, and when the rotary scraper further rotates, the upper and lower opening / closing dampers return to a normal state, and are scraped by the rotary scraper. Dust is discharged outside the casing through the discharge duct.

[0021]

According to the first aspect of the present invention, the gas partition plate is arranged at a predetermined central angle about the longitudinal axis of the casing, instead of arranging a predetermined number of nozzles in a line for each nozzle pipe as in the prior art. The filter tube is freely and compactly arranged at an appropriate pitch in a sector of a fan-shaped or isosceles triangle obtained by dividing the nozzle, and a fan-shaped or isosceles-triangular nozzle corresponding to the filter tube arrangement. A nozzle is arranged on the holder.

Further, in the second invention of the present application, the nozzle holder is rotated at a predetermined angle about the longitudinal axis of the casing so as to be positioned at a position corresponding to each sector of the gas partition plate. Is done. That is, by sequentially performing this rotation operation, all the sectors are covered by one nozzle holder, and the duct separation by the high-pressure air can be performed on all the filter tubes.

Further, in the third invention of the present application, a portion along the casing longitudinal axis of the curved pipe portion provided at the center of rotation of the nozzle holder is rotatably supported by a bearing.
By allowing the bearings to bear the loads in the radial and thrust directions, the positional accuracy of the nozzle holder is secured with a compact configuration.

Still further, in the fourth aspect of the present invention, the nozzle holder is rotatable around a rotatable shaft provided on the lower end side of the curved tube and rotatably supported. High-pressure air is supplied to the nozzle holder through the section and the curved pipe section. That is, the rotary shaft of the nozzle holder and the supply pipe of high-pressure air to the nozzle holder are also used.

Still further, in the fifth aspect of the present invention, the straight pipe portion is rotated by rotating a driving plate fixed to the protruding portion below the casing by a predetermined angle. Thereby, the nozzle holder is rotated by a predetermined angle through the straight pipe portion, and is positioned at a position corresponding to above each sector of the gas partition plate.

Still further, in the sixth invention of the present application, one piston-type main valve provided between the straight pipe portion and the high-pressure air supply source has a pressure for opening and closing the valve body. The operation is controlled by a diaphragm type control valve communicating with the chamber. That is, there is only one pulse valve in the entire apparatus, and the pulse valve is constituted by a piston type valve (main valve), and a diaphragm valve that can increase the valve opening area for the valve size communicates with its pressure chamber. ing. By opening this diaphragm valve,
The pressure in the pressure chamber of the main valve is instantaneously released, the piston valve is instantly opened, and high-pressure air is instantly injected into the filter tube as a stronger pulse pressure wave from the nozzle via the high-pressure air supply pipe and the nozzle holder. . The blast air pressure wave generated at that time instantaneously inflates the bag filter attached to the filter tube, and the dust attached to the outer surface of the filter tube is peeled off by the impact force.

Still further, in the seventh invention of the present application, the unpurified exhaust gas guided from the exhaust gas inlet to the casing through the dust-containing gas distribution tube is located above the predetermined height of the dust-containing gas distribution tube. And flows into the filter tube side while being dispersed from the plurality of holes provided in the filter tube. Since the exhaust gas inflow direction is toward the inner peripheral wall of the cylindrical casing, the dust separated from the filter tube rides on the exhaust gas flow toward the inner peripheral side of the casing, and falls along the inner peripheral wall.

Still further, in the eighth aspect of the present invention, the bottom of the casing is formed not in a hopper shape but in a substantially flat shape, and the dust on the bottom plate is turned on the bottom plate of the casing by rotating about the longitudinal axis of the casing. There is a rotary scraper for raking the garbage. The dust that has fallen and accumulated on the casing bottom plate is raked up by the rotary scraper.

Further, in the ninth invention of the present application, an upper and lower two-stage open / close damper is provided in a discharge duct attached to the opening of the casing bottom plate, and the upper damper is closed in a normal state where dust is not discharged. , The lower damper is open. These upper and lower opening / closing dampers are driven to open and close by the rotary operation of the rotary scraper toward the opening, and the opening and closing operations of the upper and lower dampers are performed in conjunction with each other. By the action of the double damper, dust is discharged out of the apparatus while being shut off from outside air.

[0030]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an explanatory vertical cross-sectional view schematically illustrating a cross-sectional structure of a bag filter device 1 according to the present embodiment. As shown in the figure, the bag filter device 1 includes a casing 2 having an exhaust gas inlet 2a, an exhaust gas outlet 2b, and a dust outlet 2c as its basic components. The casing 2
Has a ceiling plate 2d formed of a steel plate member having a predetermined thickness, preferably in a cylindrical shape, and covering the upper end thereof, and a bottom plate 2e set at a predetermined height from the ground. By making the casing 2 cylindrical, for example, when the diameter is designed to be 3000 mm and the thickness of the steel plate is set to 4.5 mm,
Since it can sufficiently withstand an external pressure up to a static wind pressure of about 400 mmWG, there is an advantage that a reinforcing material can be omitted in a normal use range. Incidentally, in the case of a rectangular casing, the weight ratio of the reinforcing material may be as much as 50% with respect to the casing body, and omitting the reinforcing material is very advantageous in practice.

Inside the casing 2, a number of filter tubes 3 and a mounting tube plate (gas partition plate) 4 for supporting the filter tubes 3 are provided.
And a gas distribution tube 5 for guiding the exhaust gas flowing into the device 1 to the filter tube 3 side. The mounting tube plate 4 also serves as a gas partition plate that separates a purified exhaust gas region and an unpurified exhaust gas region, and is hereinafter also referred to as a gas partition plate 4 as appropriate. Above this gas partition plate 4,
As will be described later, a planar nozzle holder 6 having a substantially isosceles triangle or a sector shape when viewed in plan is disposed.

Inside the gas distribution tube 5, a hot air pipe 10 for passing the hot air supplied from the hot air supply device 13 into the device 1 at the time of warm air operation such as when the device 1 is started is coaxially located. Further, an air supply pipe 9 extending from the high-pressure air supply device 12 is coaxially arranged inside the hot air pipe 10. The nozzle holder 6 is connected to a terminal side of the air supply pipe 9. Further, as described later, the upper part of the air supply pipe 9 than the middle part thereof can be rotated by the supply pipe driving device 11. Further, on the upper and lower sides of the bottom plate 2 e of the casing 2, as a mechanism for collecting dust separated from the filter (bag filter) of the filter tube 3 and discharging the collected dust to the outside of the apparatus 1, a dust having a rotary scraper described later is provided. A collecting device 7 and a dust discharging device 8 having a simultaneous open / close double damper mechanism that operates in conjunction with the collecting device 7 are arranged.

In the above configuration, the exhaust gas introduced from an exhaust gas generation source (not shown) such as a garbage incinerator flows into the apparatus 1 from an exhaust gas inlet 2a located at the lower part of the casing 2, and After passing through each filter tube 3 from the outer surface thereof and rising through the distribution tube 5, the dust-containing gas is filtered during that time, becomes a clean gas, and is discharged from the exhaust gas outlet 2 b provided at the upper part of the casing 2 to the outside of the device 1. Is derived. On the other hand, the dust filtered by the filter tube 3 adheres to the outer surface of the filter tube 3.
The high-pressure air supplied from the high-pressure air supply device 12 is jetted from above each filter tube 3 via the air supply pipe 9 and the nozzle holder 6 in order.

At this time, as will be described later, the supplied high-pressure air is instantaneously injected from the nozzle attached to the nozzle holder 6 by the action of the pulse valve of the high-pressure air supply device 12, and the filter cylinder 3 is instantaneously injected. When expanded, the dust adhering to the outer surface of the filter tube 3 due to the impact is peeled off. The isosceles triangular or fan-shaped nozzle holder 6 is rotated by a predetermined angle, and at each rotation position, high-pressure air is injected from the nozzle to perform pulse cleaning with a pulse pressure wave and adhere to the outer surface of the corresponding filter tube 3. Peel off dust. The dust separated from the outer surface of the filter tube 3 in this manner is
Fall along the inner wall of the casing 2 and accumulate on the bottom plate 2e of the casing 2. The dust accumulated on the casing bottom plate 2e is
As will be described in detail later, the dust is collected by the dust collecting device 7 and discharged to the outside by the dust discharging device 8.

Next, the main components of the bag filter device 1 will be described in detail. FIG. 2 is an enlarged perspective view showing the arrangement state of the filter tube 3 and the nozzle holder 6, and is an enlarged view of a portion A in FIG. Also, FIG.
FIG. 5 is an explanatory view showing the nozzle holder 6 and its support structure in detail. As shown in these drawings, in the present embodiment, the circular mounting tube plate (gas partition plate) 4 is divided into, for example, 14 fan-shaped (that is, radially at a predetermined angle), and one divided portion 4S (divided The filter tubes 3 are arranged at a predetermined number (11 in this embodiment) per sector. In this case, since the gas partition plate 4 is composed of all sector-shaped divided sectors 4S having the same shape, the production efficiency is improved and the accuracy can be improved. The filter tubes 3 are arranged at the most appropriate intervals in each of the divided sectors 4S (for example, so as to minimize the dead space). Each filter tube 3 is fitted at its upper end to the gas partition plate 6 and has a cage 3c inserted therein. The cage 3c prevents the gas from contracting due to the differential pressure. still,
Since each of the filter tubes 3 is the same as a well-known filter tube, illustration and detailed description of its structure and the like are omitted.

The gas distribution cylinder 5 for guiding the unpurified dust-containing gas flowing into the apparatus 1 to the filter cylinder 3 has a large number of holes 5h in its wall, as can be clearly seen from FIG. The dust-containing gas is guided from the inside of the gas distribution tube 5 to the filter tube 3 through the hole 5h. At this time, the dust-containing gas blown from the lower portion of the casing 2 is blown in the circumferential direction from the gas distribution tube 5 at the center of the casing, and the dust separated from the outer surface of the filter tube 3 by this air flow pattern is removed.
And collides with the inner wall of the casing 2,
It falls along this inner wall. Therefore, the dust is less likely to reattach, and the dust can be separated and dropped very efficiently. No hole 5h is provided in the side wall below the middle part of the gas distribution tube 5 (see FIG. 1), and it is considered that falling dust is not sowed by the inflowing exhaust gas.

3, the nozzle holder 6 is formed in a substantially isosceles triangular shape in a plan view, and the inner angles sandwiched by the equal sides are each divided sector of the mounting tube plate (gas partition plate) 4. 4S is set to be equal to the central angle β, and the vertices corresponding to the interior angle (angle β) sandwiched between equal sides of the isosceles triangle are arranged inside. On the lower surface side of the nozzle holder 6, air nozzles 6n are arranged in an arrangement corresponding to the arrangement of the filter tubes 3 attached to each of the divided sectors 4S of the attachment tube plate 4. In order to obtain a uniform pulse pressure wave from each of the nozzles 6n, the air nozzles 6n are slightly changed in diameter or provided with a baffle plate (not shown).

As will be described later, the nozzle holder 6 has an angle β equal to the inner angle of its apex (that is, the mounting tube plate 4).
Of the one divided sector 4S, or more preferably, by rotating the divided sector 4S by an angle that is a multiple of the above angle β, so that the filter tube of the divided sector 4S positioned below the divided sector 4S is positioned. 3, high-pressure air is injected from the air nozzle 6n. When the nozzle holder 6 sequentially performs the rotation operation, all the sectors 4S are sequentially covered, and all the filter cylinders 3S are covered.
Can be separated by high-pressure air.

The air supply pipe 9 is connected to the casing 2
After extending along the longitudinal axis of the gas partition plate 4, it is bent 90 degrees by an elbow 9 e above the gas partition plate 4 and extends substantially parallel to the gas partition plate 4. It is connected to the terminal of the supply pipe 9 (see FIG. 2). Note that, in FIG. 2, illustration of a hot air pipe 10 located around the air supply pipe 9 is omitted in order to clearly show the arrangement structure of the air supply pipe 9. The base of the elbow 9e of the air supply pipe 9 is supported by a bearing 21 located at the center of the circular gas partition plate 4.

The bearing 21 is of a disk plate type as shown in FIG. 4, and as shown in detail in FIG. 5, an upper flange 22 fixed to the base of the elbow 9e of the air supply pipe 9, and an air supply The gasket 2 is located between the lower flanges 23 fixed to the upper end of the vertical portion 9v of the pipe 9.
For example, a disc plate 24 made of, for example, cast iron is sandwiched between the two flanges 22
3 are fixed to each other, and the outer peripheral side of the disk plate 24 thus fixed is supported by a bearing housing 25 supported above the gas partition plate 4. By using such a disk plate type bearing 21, it is possible to bear the load in both the radial direction and the thrust direction, so that the base of the elbow portion 9e is firmly supported, and the positional accuracy of the nozzle holder 6 is sufficiently secured. can do.

A wing plate 26 (see FIGS. 4 and 5) is fixed to an upper portion on the outer side of the nozzle holder 6, while a wing plate 26 (see FIGS. 4 and 5) is provided on a predetermined portion of the inner wall of the casing 2 to prevent the nozzle holder 6 from floating. A bracket 27 is attached. And since this holding bracket 27 is located above the wing plate 26,
When high-pressure air is jetted from the air nozzle 6n, the nozzle holder 6 is prevented from floating due to the reaction. A guide roller 28 is attached to the lower side of the nozzle holder 6 via a support leg 28a, and the guide roller 28 rolls on the upper surface of the gas partition plate 4 so that the disk plate-type bearing 21 is centered. The rotation operation of the nozzle holder 6 is smoothly guided.

As is apparent from the above description, in the present embodiment, since the filter tube 3 and the nozzle holder 6 are in the same temperature region (in the casing 2), the position is shifted by the difference in the degree of thermal expansion. There is no need to worry. Also,
The nozzle holder 6 rotates by a division angle β of one divided sector 4S of the mounting tube plate 4. Since the angle is constant without being affected by thermal expansion, the relative position between the filter tube 3 and the nozzle holder 6 does not change even at this point. In the case of the present embodiment, the nozzle 6n close to the axis and the nozzle 6 far
The distance to n is set to, for example, only 600 mm, and a substantially uniform pulse pressure wave can be obtained regardless of the nozzle position on the nozzle holder 6.

The upper end of each filter tube 3 is fitted and fixed to the gas partition plate 6, and the cage 3c is inserted from above. The filter cloth (bag filter) is damaged and replaced. In this case, it is necessary to remove the cage 3c, but in the case of the present embodiment, the nozzle holder 6 is attached to the filter tube 3c.
If the nozzle holder 6 is rotated to a sector position other than the sector 4S requiring the maintenance work, the nozzle holder 6 does not become an obstacle. The nozzle holder 6 can be used as a scaffold for work. Therefore, the maintainability can be greatly improved as compared with the nozzle fixed type (for example, see FIGS. 14 and 15) which requires attachment / detachment of the nozzle holder (nozzle pipe) each time. In particular, when applied to a high-temperature gas, in the conventional nozzle fixed type, at the time of maintenance, it is necessary to wait until the temperature drops to a certain level or less, but in such a case, a more remarkable effect can be obtained. .

Further, in this embodiment, the number of times of driving required to make the nozzle holder 6 make one round (360 degrees) is 14 (the number of divisions of the gas partition plate 6), and a predetermined number of nozzles are provided for each nozzle pipe. Compared with the conventional nozzle pipe type (for example, see FIGS. 19 and 20) in which the number of driving operations is very small, which is advantageous in improving the durability of the driving device. Further, since the disk plate type bearing 21 for supporting the rotation operation of the nozzle holder 6 is located on the cleaned clean gas side, there is no possibility that the wear is promoted by dust.

Further, the gas partition plate 6 is connected to the casing 2.
Is divided at a predetermined central angle about the longitudinal axis of (i.e., divided in the radial direction), and the filter tube 3 is arranged in each sector 4S of the fan-shaped (or isosceles triangular) thus obtained. In addition, the filter tube 3 can be compactly arranged at an appropriate pitch. That is, since the arrangement of the filter cylinders 3 can be freely and appropriately set, the dead space of the gas partition plate 6 can be minimized. The nozzle holder 6 is also formed in a flat isosceles triangular shape (or a fan shape) corresponding to the sector 4S, and the nozzle 6n is arranged corresponding to the filter tube arrangement in each sector 4S. .

FIG. 6 shows a vertical section 9v of the air supply pipe 9.
FIG. 2 is an enlarged perspective view showing a part B in FIG. 1 for explaining a supply tube driving device 11 for rotating the tubing. As shown in FIG.
Has a drive disk 31 integrally fixed near the lower end of the vertical portion 9v of the air supply pipe 9, and, for example, an air-driven cylinder device 32 for rotating the drive disk 31. More preferably, the driving disk 31 is formed with 14 engaging holes 31h which are arranged in a circumferentially equidistant manner corresponding to the number of divisions of the divided sectors 4S of the mounting tube plate 4, while
As shown in FIG. 7, a piston head 33 holding an engagement claw 34 capable of engaging with the engagement hole 31h is slidably held up and down at the tip of the piston 32p of the cylinder device 32.

A tapered portion 34a is formed at the tip of the engaging claw 34 so that the claw 34 is hooked in only one direction.
When the cylinder device 32 performs the contracting operation and the piston 32p retreats rightward in FIG. 7, the engagement claw 34 maintains the engagement state with the engagement hole 31h of the driving disk 31,
The disk 31 is rotated clockwise in FIG. Conversely, when the cylinder device 32 performs the extension operation and the piston 32p moves forward to the left in FIG.
The engaging claw 34 moves upward when the 4a rides on the hole wall, and is disengaged from the engaging hole 31h of the driving disk 31.

In this way, the driving disk 31 is rotated by a predetermined angle by reciprocating the engaging claw 34, which is caught only in one direction, at a predetermined pitch by the cylinder device 32. Along with this, the vertical portion 9v of the air supply pipe 9 integrated with the driving disk 31 (therefore, the nozzle holder 6 integrally connected thereto) is rotated by the same angle, and the gas partition plate 4 is turned. Is positioned at a position corresponding to above each sector 4S.
Although not specifically shown, the driving disk 31 is not shown.
Is preferably provided with a ratchet mechanism for preventing reverse rotation.

The rotation angle of the driving disk 31 (that is, the nozzle holder 6) is more preferably determined as follows. That is, if the driving disk 31 is set so as to rotate by the same angle as the division angle β of the division sector 4S of the mounting tube plate 4, dust is peeled off by the pulse pressure wave and the filter tube has just been cleaned. Since the filter tube 3 attached to the divided sector 4S immediately adjacent to the column 3 is separated by dust with a pulse pressure wave, it is considered that the separated dust easily adheres to the filter tube 3 that has just become clean. .

For this reason, the rotation angle of the nozzle holder 6 is
It is desirable to set at least one or more divided sectors 4S to be empty, and the piston stroke of the cylinder device 32 is set to a pitch corresponding to two to three divisions,
Alternatively, the number of round trips is increased. Therefore, in the case of the present embodiment, when setting the rotation angle of the nozzle holder 6, it is generally desirable to divide the nozzle holder 6 into 10 divisions (360/10 degrees) or 14 divisions (360/14 degrees).
Note that 12 divisions, which is a common multiple of 2 and 3, is not preferable in this regard. Further, the odd division is not so preferable in relation to the ceiling plate 2d of the casing 2. That is, when taking out the filter tube 3 and performing maintenance such as replacement of the bag filter,
The ceiling tube 2d is removed, and the filter tube 3 is taken out from above. The ceiling plate 2d usually has a large opening in one section in order to enhance workability, workability, and gas sealability. , Two division sectors, that is, an even number is preferable.

The vertical portion 9v of the air supply pipe 9 is rotatably supported by a bearing 35 below the driving disk 31, and further below the bearing 35, as shown in FIGS. Approximately L
It is rotatably connected to a terminal portion of a supply main pipe 39 extending in a letter shape. That is, an outer sleeve 38 (see FIG. 9) is provided on the outer peripheral portion of the supply main 39 on the terminal side.
The outer sleeve 38 and the supply main 3 are fixed.
A predetermined gap 39a is formed between the air supply pipe 9 and the end portion of the air supply pipe 9, and the lower end of the vertical portion 9v of the air supply pipe 9 is rotatably and vertically slidably inserted into the gap 39a. A ring-shaped sealing member 37 for hermetically sealing the space between the vertical portion 9v and the inner sleeve 38 is mounted.

Therefore, the vertical portion 9v of the air supply pipe 9
Is the supply main 3 fixed to the high-pressure air supply device 12.
The vertical portion 9v is vertically movable with respect to the supply main tube 39 due to the difference in the degree of thermal expansion between the supply main tube 39 and the vertical portion 9v. Because it can slide freely, it is reliably absorbed. Further, in the present embodiment, the nozzle holder 6 is rotated about the vertical portion 9v of the air supply pipe 9 as a rotation axis, and the rotation axis of the nozzle holder 6 and the supply pipe of high-pressure air to the nozzle holder 6 are connected. Is also used,
The structure is simplified.

FIG. 10 is an explanatory longitudinal sectional view showing the structure of the high-pressure air supply device 12 in an enlarged manner, showing a portion C in FIG. As shown in this figure, the high-pressure air supply device 12 includes a pressure tank 41 for storing high-pressure air at a predetermined pressure, and a pulse valve device 42 mounted on, for example, an upper portion of the pressure tank 41. A base end of the supply main pipe 39 connected to the vertical portion 9v of the air supply pipe 9 is provided inside the tank 41.

The pulse valve device 42 controls, for example, a first valve 43 of a piston type as a main valve for opening and closing a base end opening 39 a of the supply main pipe 39, and a pressure in a pressure chamber 43 s of the piston valve 43. A diaphragm type second valve 44 and the diaphragm valve 4
For example, it is constituted by a three-element valve such as a solenoid-type third valve 45 for controlling the pressure in the fourth pressure chamber 44s. The diaphragm valve 44 and the solenoid valve 45 are assembled as a pair.
It is commercially available as a so-called pulse valve for cleaning a bag filter using a shock wave.

The piston valve 43 is fixed by inserting a relatively short pipe-shaped valve housing 43b having a connection flange 43f into the upper part of the pressure tank 41, and slidably mounts a valve body 43v in the valve housing 43b. It is arranged and configured. The valve housing 43b is disposed substantially coaxially with the base end of the supply main pipe 39, and the base opening 39a of the supply main pipe 39 is opened and closed by a valve body 43v. That is, the pressure tank 41 and the pressure chamber 43s are provided in the valve body 43v.
For example, a plurality of communication holes 43h are provided to communicate with the diaphragm valve 44 and the solenoid valve 4
In a state where both the valves 5 and 5 are closed, the high pressure air in the pressure tank 41 is guided into the pressure chamber 43s from the communication hole 43h and is kept at a high pressure, so that the valve element 43v of the piston valve 43 is closed. Will be maintained.

As described above, the above three valve elements 43,
When the solenoid valve 45 is opened by input of a control signal from a state where all of the valves 44 and 45 are closed, air in the pressure chamber 44s of the diaphragm valve 44 is discharged to the outside (see a broken line arrow Y1 in FIG. 10). , The valve body 44v of the diaphragm valve 44 is opened. For this reason,
The air in the pressure chamber 43s of the piston valve 43 is released to the outside via the diaphragm valve 44 (see the dashed arrow Y2 in FIG. 10), and the pressure in the pressure chamber 43s decreases, and the valve body 43v of the piston valve 43 moves upward. Open. As a result, the high-pressure air in the pressure tank 41 flows into the supply main pipe 39 (see the dashed arrow Y3 in FIG. 10), and becomes a pulse pressure wave to form the air supply pipe 9.
Through the nozzle holder 6.

As is well known, the diaphragm valve 4
In No. 4, since the valve opening area can be made large for the valve size, opening the diaphragm valve 44 instantaneously opens the air in the pressure chamber 43 s of the piston valve 43. Thus, the pressure chamber 43 of the piston valve 43
By instantaneously releasing the air of s to the atmosphere with the diaphragm valve 44, the piston valve 43 opens instantaneously,
High-pressure air is instantaneously injected toward the filter tube 3 through the air supply pipe 9 and the nozzle holder 6 as a stronger pulse pressure wave from the nozzle 6n. The blast air pressure wave generated at that time instantaneously expands the bag filter attached to the filter tube 3, and the dust attached to the outer surface of the filter tube 3 is peeled off by the impact force.

In this embodiment, the number of pulse valves is one (only piston valve 43), and one pulse valve is provided for each conventional nozzle pipe (for example, see FIGS. 14 and 15). The frequency of opening and closing increases as compared with. For this reason, the valve element 43v of the piston valve 43
Is made of, for example, a polymer material having both strength and elasticity, and its thickness is set to be large. Valve 43v
Is negligible compared to the rising force generated when the air in the pressure chamber 43s is opened to the atmosphere, so that the thickness of the valve can be increased unlike the conventional diaphragm valve.
Further, the valve body 43v can be made of metal. As a result, it is possible to expect a long service life and a breaking force that are incomparable with those of the diaphragm valve. Further, the opening area of the valve 43 with respect to the valve body 43v can be freely increased. By increasing the opening area, the ascending force generated by releasing the back pressure of the valve body 43v (the pressure in the pressure chamber 43s) is increased. The opening time of the valve 43 can be shortened, the high-pressure air in the pressure tank 41 can be sent in a shorter time, and the rising of the pulse pressure wave can be made steep. Thereby, the filter cloth of the filter cylinder 3 can be expanded more rapidly, the impact force can be increased, and the attached dust can be more effectively peeled off.

In this embodiment, since there is one pulse valve, the structure of the pressure tank to be attached can be simplified, and even if a high-grade material is used for the valve body 43v, the cost burden is very small. I'm done. The operating valve for operating the main valve (piston valve 43) is the diaphragm valve 44, which is small in size, for example, with a diameter of 20A, has a small valve opening / closing impact, and can be expected to have a long life. Further, even if the operating valve is replaced as soon as possible, the cost is very small because the entire apparatus is one.

In the case where one pulse valve is provided for each conventional nozzle pipe, a diaphragm valve is usually employed as the pulse valve.
If a diaphragm type is used for the main valve, the mass (volume) becomes large, and a long life cannot be expected due to repeated fatigue. In addition, because a large number of pulse valves are used, it is difficult to identify which valve is leaking when a leak (leak) occurs in the valve body inside the valve. Further, in order to increase the rising speed of the pulse pressure wave and enhance the dust separation effect, it is important how to rapidly release the pressure in the pressure chamber 43s of the piston valve 43. In this respect, in the case of the diaphragm valve 44, As described above, since the valve opening area is large for the valve size, the responsiveness is high, and a large amount of air can be released instantaneously.

In the filter cloth cleaning method of the bag filter device 1 according to the present embodiment, the filter cloth is instantly expanded by the pulse pressure wave obtained as described above, and the dust adhering to the outer surface of the filter cloth is imposed by the impact. Is a method that uses a pressure wave that separates the gas, and the cleaning method is fundamentally different from the conventional pulse jet method using a Venturi tube (that is, a backwash method using secondary air). ing.
In the cleaning method according to the present embodiment, since the pressure wave is used, the length of the filter tube 3 can be increased, and the air consumption can be reduced. In contrast, in the case of the conventional pulse jet method, the cleaning effect depends on the magnitude of the backwash air amount,
Further, since the backwash air does not easily reach the tip of the filter tube, the filter tube cannot be made long, and a large amount of high-pressure air is required.

FIG. 11 is a perspective view showing the structure of the dust collecting device 7 in an enlarged manner, showing a portion D in FIG. As shown in this figure, the dust collecting device 7 includes a rotary scraper 51 for scraping dust collected from the filter (bag filter) of the filter tube 3 and remaining on the casing bottom plate 2e, and a rotary scraper 5 for collecting the dust.
1 is provided with a scraper driving mechanism 52 for driving the motor 1.
The rotary scraper 51 is formed by bending a flat plate member having a predetermined width into a substantially rectangular shape. On the other hand, the scraper driving mechanism 52 has two flat steel rings 53a, 53b having different diameters by a predetermined dimension coaxially arranged, and a large number of bolts 53c arranged in the radial direction at a predetermined pitch with both rings 53a, 53b. To form a pin rack 53, and this pin rack 53 is connected to a predetermined number of engaging pins 54.
p is rotated by a pin gear 54 formed so as to protrude in the radial direction.

Although not specifically shown, the scraper driving mechanism 52 is formed by winding an angle iron in a ring-like shape in a non-opening portion at a lower portion of the gas distribution tube 5 to use it as a rotary bearing. Therefore, the structure is simple, the sliding area is large, the wear rate is slow, the manufacturing accuracy is not required, and the cost is extremely low. The rotating scraper 51 is also fixed to a pin rack 53 formed by connecting two flat steel rings 53a and 53b coaxially with bolts 53c at intervals and includes a pin gear 54 to be driven. Designed to be simple, it can rotate reliably in dusty environments. Although not specifically illustrated,
The drive shaft 54s of the pin gear 54 is connected to a drive source such as an electric motor.

The inner end of the rotary scraper 51 is fixed to the outside of the lower part of the pin rack 53 via a mounting bracket 55. The ring 53 a inside the pin rack 53 is slidably fitted on the outer periphery of the lower part of the gas distribution tube 5. Further, an opening 2h in which a dust discharge device 8 described later is provided is formed in a predetermined portion of the casing bottom plate 2e. When the pin gear 54 is rotated by the rotation of the drive shaft 54s, the pin rack 53 is rotated accordingly, and the rotary scraper 51 is rotated while sliding on the casing bottom plate 2e, and the casing bottom plate 2e is rotated. The dust accumulated on the top is scraped and dropped toward the dust discharge device 8 from the opening 2h.

The number of pins 53c (bolts) of the pin rack 53 is set to be four to five times larger than the number of teeth (engaging pins 54p) of the pin gear 54. The number of rotations of the drive shaft 54s of the pin gear 54 is reduced to 1/5 to 1
The speed is reduced by / 4 and transmitted to the rotary scraper 51. Thus, in the present embodiment, a high reduction ratio can be obtained without providing an expensive reduction gear. A rotary scraper 51 having a very simple structure made by bending a flat steel into a square is used to form a casing bottom plate 2e.
The dust accumulated on the top can be raked up.

FIG. 12 is a longitudinal sectional view for explaining the structure of the dust discharging device 8 and showing an enlarged view of a portion E in FIG. As shown in this figure, the dust discharging device 8 is opened and closed by a first link mechanism 62.
A double damper mechanism having a damper 61 (upper damper) and a second damper 63 (lower damper) that is opened and closed by a second link mechanism 64 is provided so as to hang down from an opening 2h of the casing bottom plate 2e. The lower damper 63 is configured to be arranged in the duct 65, and performs the reverse operation in conjunction with the opening / closing operation of the upper damper 61. The first link mechanism 62 includes a fixed lever 62a fixed to an upper inner wall of the discharge duct 65, and a first rotating lever 62b having one end rotatably supported at an upper end side of the fixed lever 62a.
And a second rotary lever 62c having one end rotatably supported at the other end of the first rotary lever 62b, and the upper damper 61 is supported at the other end of the second rotary lever 62c.

Further, the second link mechanism 64 is provided as shown in FIG.
As can be clearly understood from FIG.
, A second lever 64b having one end rotatably supported at the other end of the first lever 64a, and one end rotatable at the other end of the second lever 64b. And a third rotating lever 64c supported by the second lever 64c. The other end of the third lever 64c is connected to a pivot 63 of the lower damper 63.
s. Further, the lower damper 63 is designed to be thicker and heavier than the upper damper 61.

In the above configuration, from the initial state in which the upper damper 61 is closed and the lower damper 63 is opened (normal state in which dust is not discharged), the rotary scraper 51 is moved in the direction of the arrow in FIG. Then, the rotary scraper 51 rotates the first rotary lever 62b of the first link mechanism 62 in a counterclockwise direction and pushes it down. With this, the second rotary lever 62c is pushed down and the upper damper 61 is pushed down. It is rotated and opened counterclockwise.
At this time, the pivot shaft 61 associated with the opening operation of the upper damper 61
By the rotation operation of s in the counterclockwise direction, the first lever 64a of the second link mechanism 64 is rotated in the same direction.
Thereby, the second lever 64b of the second link mechanism 64 is pulled up, and accordingly, the third lever 64c is rotated clockwise. As a result, the lower damper 63 is also rotated in the same direction via the pivot shaft 63s and closed. In addition, the rotary scraper 51
When the first link mechanism 62 is further disengaged from the first rotation lever 62b in the direction of the arrow in FIG.
Lower damper 6 set heavier than upper damper 61
With the weight of 3, the lower damper 63 is opened and the upper damper 61 is closed to return to the initial state in an operation opposite to the above operation.

As described above, the rotary scraper 51
The dust gathered by the first is mainly composed of the rotary scraper 51 and the first rotary lever 62 of the first link mechanism 62.
b when the upper damper 6 is basically closed.
1 is scraped off. When the scraper 51 further advances, the upper damper 61 opens, and at that time, the dust falls on the lower damper 63 which is in a closed state. When the scraper 51 further advances to disengage the first link mechanism 62 from the first rotary lever 62b, the lower damper 63 is opened by the weight of the lower damper 63, and the dust on the lower damper 63 is discharged. The air is discharged from the lower part of the duct 65 to the outside of the apparatus.

That is, only when the rotary scraper 51 rotates and collects dust, the double damper mechanism of the dust discharging device 8 operates to discharge dust. At this time, the dust is discharged outside the device while being shut off from the outside air by the action of the double damper. Since the inside of the casing 2 is normally at a negative static wind pressure, the upper damper 61 designed to be lighter is used.
Preferably, the closed state is assisted by the negative pressure. Therefore, a higher gas shutoff effect can be obtained as compared with a rotary valve that has been conventionally and generally employed. In addition, there is no need for a dedicated driving device for driving the damper. Moreover, in the present embodiment, the bottom surface 2e of the casing 2 is
Since it is not a hopper type as in the prior art but is formed in a flat shape, the height space required for performing maintenance from the lower side of the filter tube 3 is a height required for work from the bottom of the filter tube 3, All you have to do is open a space of about 700 mm.
By the way, for example, if a casing having a cylindrical diameter of 3000 mm is formed into a hopper type having a vertical angle of 60 degrees, a height of about 2700 mm is required only for the height corresponding to the inclined portion of the hopper.
The difference can be as low as 2000 mm.

It should be noted that the hopper type is hardly applied to high-temperature dust and sticky dust, particularly dust from general municipal waste incinerators. Therefore, a rotary scraper type is naturally adopted for the cylindrical casing, and even a square casing is squeezed to have a round bottom to attach a rotary scraper or a chain scraper. However, both of the scraper types result in intermittent discharge of dust by the scraper, that is, dumpling discharge. Therefore, there is a disadvantage that the rotary valve located downstream is likely to be clogged, and a rotary valve having a larger size must be selected as compared with continuous discharge.

Although not directly related to the nozzle holder 6 according to the present embodiment and the operation thereof, the bag filter device 1 according to the present embodiment includes, as shown in FIG. A supply device 13 is provided. When applying a bag filter device to, for example, a general municipal garbage incinerator,
At the beginning of burning the incinerator, it is indispensable to warm up with the hot air supply device 13 in order to prevent the filter cloth from being clogged by the moisture in the gas at low temperatures. In general, warm air is introduced from the lower portion of the casing 2 and is raised, and then is removed from the upper portion. In the present embodiment, the hot air pipe 1 is coaxial with the air supply pipe 9.
0, whereby the supply pipe 9 is located on the side of the filtered clean gas and is completely shut off from the dust-containing gas. Therefore, the air supply pipe 9 is protected against wear and corrosion due to dust. In addition, compared to a case where the hot air pipe 10 is laid outside the casing 2, the heat insulation work can be omitted, the heat loss is small, and the hot air supply device 13 can be made compact. Can be.

Further, according to the bag filter device 1 according to the present embodiment, the nozzle driving device, the pressure tank, the pulse valve, the hot air device and the like are all installed on the ground. Therefore, it is not necessary to ascend to the apparatus except when replacing the filter cloth, and the maintenance property is extremely good. Furthermore, since a circular manhole with high sealing properties can be installed by utilizing the central space of the ceiling of the cylindrical casing, it is convenient for emergency branding when the filter cloth is damaged. In addition, the present invention
It is needless to say that the present invention is not limited to the above embodiments, and various improvements or design changes can be made without departing from the scope of the invention.

[0074]

According to the first aspect of the present invention, instead of arranging a predetermined number of nozzles in a line for each nozzle pipe as in the prior art, a predetermined central angle about the longitudinal axis of the casing is used. The filter tube is arranged in a sector of sector shape or isosceles triangle obtained by dividing the gas partition plate, so the filter tube can be arranged freely and compactly at an appropriate pitch, and the dead space is minimized. can do. In addition, nozzles are arranged in a fan-shaped or isosceles triangular nozzle holder corresponding to the filter tube arrangement, and by positioning the nozzle holder on the sector, the filter tube arranged in the sector is arranged. High-pressure air can be injected without any problem. That is, wasteful space is eliminated to increase the effective filtration area per unit plane, and the dust-containing gas is effectively evenly distributed to each filter tube to make the gas velocity (that is, dust velocity) non-uniform (uneven). )
, And local wear of the filter cloth can be avoided. In the case of the straight nozzle pipe system, early wear of the filter cloth in the front row on the gas inflow side cannot be avoided. Moreover, since the gas partition plate is composed of all sector-shaped or isosceles triangular divided sectors having the same shape, the production efficiency is improved and the accuracy can be improved.

According to the second aspect of the present invention, basically, the same effects as in the first aspect can be obtained. In particular, the nozzle holder is positioned at a position corresponding to above each sector of the gas partition plate by being rotated by a predetermined angle about the longitudinal axis of the casing. In other words, by sequentially performing this rotation operation, all sectors are covered by one nozzle holder,
Duct separation by high-pressure air can be performed on all filter tubes. Therefore, only one pulse valve is required, and the cost is lower than that of a conventional straight nozzle pipe system in which one pulse valve is provided for each pipe. 3.) When an air leak occurs, it is not necessary to specify which valve is malfunctioning, and it is possible to respond quickly. In addition, when performing maintenance such as replacing the filter cloth by removing the cage inserted in the filter tube, maintenance work must be performed from above the filter tube. However, since only one nozzle holder can be used and the nozzle can be rotated, maintenance is required. The nozzle holder may be rotated to another location while avoiding the location that needs to be used. Further, this nozzle holder can be used as a scaffold for maintenance.

Further, according to the third aspect of the present invention, basically the same effects as in the second aspect can be obtained. In particular, since a portion of the curved tube portion provided at the rotation center of the nozzle holder along the longitudinal axis of the casing is rotatably supported by a bearing, the bearing should bear the load in the radial direction and the thrust direction. Accordingly, the positional accuracy of the nozzle holder can be secured with a compact configuration.
In this case, by positioning the bearing on the clean gas side, it is possible to eliminate the possibility of early wear due to dust.

Further, according to the fourth aspect of the present invention, basically the same effects as in the third aspect can be obtained. In particular, the nozzle holder is provided on the lower end side of the curved pipe portion and is rotated about a rotatably supported straight pipe portion as a rotation axis, and the nozzle holder is connected to the nozzle holder via the straight pipe portion and the curved pipe portion. High pressure air is supplied. That is, the rotary shaft of the nozzle holder and the supply pipe of high-pressure air to the nozzle holder are also used. Therefore, the structure of the device can be simplified, and the manufacturing cost can be reduced.

Further, according to the fifth aspect of the present invention, basically the same effects as in the third aspect can be obtained. In particular, the straight pipe portion is rotated by rotating a driving plate material fixed to the protruding portion below the casing by a predetermined angle, whereby the nozzle holder is fixed to a predetermined position via the straight pipe portion. The gas partition plate is rotated by an angle and positioned at a position corresponding to above each sector of the gas partition plate. In this case, since the position of the nozzle holder is determined only by the rotation angle, it is not affected by thermal expansion, and the position of the nozzle holder with respect to the sector of the gas partition plate,
That is, the position of the nozzle with respect to the filter tube can be accurately adjusted.

Further, according to the sixth aspect of the present invention, basically the same effects as those of the first aspect can be obtained. In particular, 1 is provided between the straight pipe section and the high-pressure air supply source.
A plurality of piston-type main valves are provided, and the operation of the main valves is controlled by a diaphragm-type control valve that communicates with a pressure chamber that controls the opening and closing of the valve body. That is, there is only one pulse valve in the entire apparatus. For this reason, compared with the conventional case where one pulse valve is provided for each pipe in the straight pipe nozzle pipe method, the cost is lower and the air leak (in the valve body) inside the valve is generated. It is not necessary to specify which valve is malfunctioning, and it is possible to respond quickly.

Further, according to the seventh aspect of the present invention, basically the same effects as those of the first aspect can be obtained. In particular, unpurified exhaust gas guided into the casing from the exhaust gas inlet through the dust-containing gas distribution tube is directed toward the filter tube from a plurality of holes provided above a predetermined height of the dust-containing gas distribution tube. It flows in while dispersing. Since this exhaust gas inflow direction is toward the inner peripheral wall of the cylindrical casing,
The dust separated from the filter tube rides on the exhaust gas flow toward the inner peripheral side of the casing, and falls along the inner peripheral wall. In this case, since the dust-containing exhaust gas diffuses from the center in the circumferential direction, uniform gas distribution is possible. That is, a very favorable pattern is formed for both the gas flow and the dust flow, there is no local wear of the filter cloth due to dust (the difference in the degree of wear of the filter cloth due to the difference in the position of the filter tube), and the peeling dust is quiet, In addition, they fall and accumulate without being disturbed. In addition, the longer the filter cylinder, the longer the dust-containing gas inflow cylinder becomes, and the lower the inflow speed from the hole can be suppressed.

Further, according to the eighth aspect of the present invention, basically the same effects as those of the first aspect can be obtained. In particular, the bottom of the casing is formed in a substantially flat shape rather than a hopper shape, and a rotary scraper is provided on the bottom plate of the casing, the rotary scraper rotating around the longitudinal axis of the casing to collect dust on the bottom plate, The dust that has fallen and accumulated on the casing bottom plate is raked up by the rotary scraper. In other words, the height of the casing can be significantly reduced as compared with the hopper type, so that not only can the apparatus itself be reduced in size, but also downsizing can be achieved over all steps, such as the stairs and the installation building. Further, since the collected dust is mechanically forcibly discharged by a scraper, a smooth operation can be performed as compared with a hopper type which is easily blocked, and a blockage prevention device such as a vibrator is not required.

Further, according to the ninth aspect of the present invention, basically the same effects as those of the eighth aspect can be obtained. Particularly, an upper and lower two-stage open / close damper is provided in a discharge duct attached to the opening of the casing bottom plate, and in a normal state where dust is not discharged, the upper damper is closed,
The lower damper is open, and the upper and lower opening / closing dampers are driven to open and close by the rotation of the rotary scraper toward the opening, and the opening and closing operations of the upper and lower dampers are performed in conjunction with each other. Then, due to the action of the double damper, dust is discharged out of the apparatus while being shut off from outside air. That is, since the simultaneous opening and closing type double damper is operated in conjunction with the scraper that collects dust and discharges the dust, the dust can reliably and easily fulfill its role without any stagnation of the dust. In addition, since the driving device is interlocked with the scraper, a driving device is not required at all, and a control mechanism and an electric wiring for the driving device can be omitted. Further, when the double damper is not operating, the negative pressure of the gas in the casing also plays a role of self-blocking, so that high sealing performance can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view schematically showing an overall configuration of a bag filter device according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a portion A in FIG.

FIG. 3 is an explanatory plan view of a nozzle holder of the bag filter device.

FIG. 4 is an explanatory side view showing the nozzle holder and its support structure.

FIG. 5 is an explanatory longitudinal sectional view showing an enlarged structure of a support bearing of the nozzle holder.

FIG. 6 is an enlarged perspective view showing a portion B in FIG. 1;

FIG. 7 is an enlarged longitudinal sectional view showing an engagement state between a driving disk of a supply pipe driving device of the bag filter device and an engagement claw of a cylinder device.

FIG. 8 is an explanatory longitudinal sectional view showing a connection state between a vertical portion of an air supply pipe and the driving disk.

FIG. 9 is an enlarged longitudinal sectional view showing a connection state between a vertical portion of the air supply pipe and a supply device side pipe.

10 is an explanatory longitudinal sectional view showing a portion C in FIG. 1 in an enlarged manner.

FIG. 11 is an enlarged perspective view showing a portion D in FIG. 1;

FIG. 12 is an explanatory longitudinal sectional view showing a portion E in FIG. 1 in an enlarged manner.

FIG. 13 is an explanatory front view of a second link mechanism of the dust discharge device.

FIG. 14 is an explanatory longitudinal sectional view of a bag filter device according to a conventional technique 1.

FIG. 15 is an explanatory plan view taken along line JJ of FIG. 14;

FIG. 16 is a perspective view of a bag filter device according to Prior Art 2.

FIG. 17 is an explanatory longitudinal sectional view showing another bag filter device according to Prior Art 2.

FIG. 18 is an explanatory plan view taken along line KK of FIG. 17;

FIG. 19 is a partial vertical cross-sectional explanatory view showing a bag filter device according to Prior Art 3.

20 is an explanatory plan view taken along line LL in FIG. 19;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bag filter apparatus 2 ... Casing 2a ... Exhaust gas inlet part 2b ... Exhaust gas outlet part 2c ... Dust discharge port 2e ... Casing bottom plate 2h ... Casing bottom plate opening 3 ... Filter cylinder 4 ... Gas partition plate (mounting tube plate) 4S ... Division sector of gas partition plate 5 ... Gas distribution cylinder 5h ... Gas distribution cylinder hole 6 ... Nozzle holder 6n ... Air nozzle 7 ... Dust collecting device 8 ... Dust discharge device 9 ... Air supply pipe 9e ... Elbow part of air supply pipe 9v: Vertical part of air supply pipe 11: Supply pipe driving device 12: High pressure air supply device 21: Disc plate type bearing 31: Driving disk 41: Pressure tank 42: Pulse valve device 43: Piston valve 44: Diaphragm valve 51: Rotary scraper 61 Upper damper 63 Lower damper 65 Discharge duct

Claims (9)

[Claims] 1. A cylindrical casing having an exhaust gas inlet, an exhaust gas outlet, and a dust outlet, a gas partition plate attached to an upper portion of the casing and separating a purified region and an unpurified region of exhaust gas. A plurality of filter tubes each having an upper end fixed to a hole provided in the gas partition plate and extending downward, and nozzles corresponding to a predetermined number of filter tubes among the plurality of filter tubes; And a nozzle holder connected to a high-pressure air supply source, and the nozzles eject high-pressure air from above the filter cylinder to separate dust adhering to the outer surface of the bag filter of the filter cylinder. A vertical external surface filtration type bag filter device, wherein the gas partition plate is divided into sector-shaped or isosceles triangular sectors having a predetermined central angle about the longitudinal axis of the casing, The nozzle holder is formed in a fan shape or an isosceles triangle shape corresponding to the sector in plan view, and the nozzles of the nozzle holder are arranged corresponding to the filter tube arrangement of each sector of the gas partition plate. A bag filter device characterized by the above-mentioned. 2. The nozzle holder is rotatably supported about a longitudinal axis of the casing, and is rotated at a predetermined angle so as to be positioned at a position above each sector of the gas partition plate. The bag filter device according to claim 1, wherein: 3. A 90-degree curved tube portion is provided at the center of rotation of the nozzle holder so as to bend in a direction along a longitudinal axis of the casing from a direction substantially parallel to the gas partition plate. 3. The bag filter device according to claim 2, wherein a portion along the longitudinal axis of the casing is rotatably supported by a bearing. 4. A straight tube portion extending along the longitudinal axis of the casing and rotatably supported is provided at a lower end side of the curved tube portion, and the nozzle holder is rotated about the straight tube portion as a rotation axis. The bag filter device according to claim 3, wherein high-pressure air is supplied to the nozzle holder via the straight pipe portion and the curved pipe portion. 5. The straight pipe portion has a lower portion protruding below the casing, and a driving plate material is fixed to the protruding portion. By rotating the driving plate material by a predetermined angle, the straight pipe portion is formed. The nozzle holder is rotated by a predetermined angle via a portion, and is positioned at a position corresponding to above each sector of the gas partition plate.
The described bag filter device. 6. A piston-type main valve is provided between the straight pipe portion and the high-pressure air supply source, and the main valve communicates with a pressure chamber for controlling the opening and closing of the valve body. 2. The bag filter device according to claim 1, further comprising a diaphragm-type control valve. 7. An exhaust gas unpurified area below the gas partition plate in the casing, one end of which communicates with the exhaust gas inlet and the other end of which is abutted on the gas partition plate and extends along the longitudinal axis of the casing. An extended dust-containing gas distribution cylinder is provided, and a plurality of holes for allowing the dust-containing gas to flow into a surrounding filter cylinder are provided in a portion above a predetermined height of the dust-containing gas distribution cylinder. The bag filter device according to claim 1, wherein 8. The casing according to claim 1, wherein a bottom portion of the casing is formed substantially flat, and a rotary scraper is provided on the bottom plate of the casing so as to rotate about a longitudinal axis of the casing and to collect dust on the bottom plate. The bag filter device according to claim 1, wherein: 9. An opening is formed in a predetermined portion of the casing bottom plate, and a discharge duct opening to the outside of the casing is attached to the opening, and an upper and lower two-stage open / close damper is provided in the discharge duct. In a normal state where dust is not discharged, the upper and lower opening / closing dampers are closed while the upper damper is closed, and the lower damper is opened. When the rotary scraper approaches the opening, the rotary scraper turns. In conjunction with the movement, the upper damper is opened, the lower damper is closed, and when the rotary scraper is further rotated, the upper and lower opening / closing dampers return to a normal state, so that the dust collected by the rotary scraper is collected. 9. The bag filter device according to claim 8, wherein the bag filter is discharged outside the casing through the discharge duct.