JPH11151412A - Bag filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely remove a sheet-like lightweight material or the like contained in a dust-containing air without lowering the dust collecting efficiency and to prevent air leakage from discharge port for the lightweight material or the like. SOLUTION: The dust-containing air containing the lightweight material is diffused and straightened in an upper horizontal introducing passage 3a to reduce the speed and changes the direction by flowing-in to a side part vertical introducing passage 3b to surely separate the lightweight material. The lightweight material is interrupted by a separator 5 and the flow-in of the lightweight material to a dust collecting section 2 is remarkably decreased. The separated lightweight material descends in the side part vertical introducing passage 3b. The dust-containing air flowing-in to the dust collecting section 2 is dust-collected by a filter 13, reaches a purifying section 12 and discharged from the discharge port to the outside of the device main body 1. The dust C captured in the filter 13 descends in the dust collecting section 2 and discharged to the outside together with the lightweight material by a material seal functional screw conveyer.

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 as a dust treatment device attached to a general waste and construction waste treatment facility.

[0002]

2. Description of the Related Art Conventionally, there are various types of bag filter devices of this type, and an example of use is shown in FIG. FIG. 5 is a general flow sheet diagram of dust-containing air containing light-weight substances discharged from each processing machine in a general waste and construction waste processing facility, etc., where A is a crusher, B is a magnetic separator, C
Is a sorter, and D is another processing machine. Dust-containing air sucked and discharged from these devices is processed by a blower E through a cyclone type pre-duster apparatus F and a bag filter apparatus G.

[0003] In this processing step, when the sorter C uses a combination of wind separation, a considerable amount of lightweight articles, for example, paper, plastic such as sheet, tape, string, etc., is collected together with air by the wind separation. (Enters the processing circuit). In this case, these lightweight objects are separated by the pre-duster device F, and then the remaining dust-containing air is subjected to dust removal by the bag filter device G.

[0004]

However, the above-mentioned pre-duster device F is usually of a cyclone type, that is, it separates the light-weight objects using centrifugal force. Due to the large resistance, it is extremely difficult to completely separate by the centrifugal force. Therefore, it is entrained by the dust-containing air toward the bag filter device G and enters the bag filter device G. Cause. For this reason, a periodic removal operation is required. Further, providing the pre-duster device F and the bag filter device G side by side has a problem that the space is increased and the cost is increased.

According to the present invention, by improving a bag filter device, the use of a pre-duster device is omitted, and light-weight substances contained in dust-containing air are reliably removed without lowering dust collection efficiency. It is an object of the present invention to provide a bag filter device capable of performing the above.

[0006]

In order to achieve the above object, the present invention first deflects the flow of dust-containing air at a substantially right angle in a device main body having a substantially rectangular cross section toward a bag filter. In addition, the bag filter device is provided with a pre-duster function by removing a light-weight object by a separator before the bag filter.

[0007] By such a deflection of the flow of the dust-containing air and the separator, a light object such as a sheet is separated from the dust-containing air, does not reach the bag filter, and does not hinder the operation of the bag filter.

Next, according to the present invention, it is necessary for this type of bag filter device to prevent air leakage from the whole.
The discharge function of the trapped dust and the light-weight material has a sealing function.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a dust collecting chamber 2 in which a number of filters 13 are arranged and an upper part of the dust collecting chamber 2 are arranged in an apparatus main body 1 having a substantially rectangular cross section. An inverted L-shaped introduction chamber 3 surrounding two sides of the side portion, and the inverted L-shaped introduction chamber 3 is provided with a partition plate 4 at a boundary surface between the two chambers 2 and 3 to partition the upper horizontal introduction chamber. A passage 3a and a side vertical introduction passage 3b provided with a separator 5 for separating a lightweight substance from dust-containing air at a boundary surface between the two chambers 2 and 3, and an inflow port 6 provided in the upper horizontal introduction passage 3a is provided. A cleaning chamber 12 formed at a position away from the side vertical introduction path 3b and having a clean air discharge port 19 on the other side of the dust collection chamber 2 is continuously provided.
A dust collecting means 15 having a sealing function is continuously provided below the dust collecting chamber 2 and a light-weight material collecting means 17 having a sealing function is continuously provided below the vertical introduction path 3b of the apparatus main body 1. obtain.

According to this structure, the dust-containing air including the light-weight material is diffused and rectified in the upper horizontal introduction passage 3a, the speed thereof is reduced, and the direction is changed by flowing into the side vertical introduction passage 3b. Lightweight objects are reliably separated. Further, the light-weight material is blocked by the separator 5 and the inflow into the dust collection chamber 2 is greatly reduced. The separated lightweight article descends on the side vertical introduction path 3b and is discharged to the outside by the collecting means 17. On the other hand, the dust-containing air that has entered the dust collection chamber 2 through the separator 5 is collected by the filter 13, and the cleaned air reaches the clean room 12 and is discharged from the discharge port 19 to the outside of the apparatus main body 1. Get out. The dust captured by the filter 13 falls in the dust collection chamber 2 by the dust removing means, and is discharged from the dust collecting means 15.

[0011] The sealing function of the discharge section is performed by the rotary valve 1.
5b or the screw conveyor 17b, in which the casing is reduced in diameter so as to extrude a lightweight object and a duct while being compressed and filled, thereby ensuring security. In the case of this screw conveyer, by providing the screw conveyer over both of the discharge units of the dust collection unit and the lightweight object collection unit, a material sealing function can be secured for both the discharge units.

Further, a suspended damper 18 for closing the screw conveyor is provided at the terminal opening (discharge port) of the screw conveyor. If the end opening is opened by swinging with the pushing force, the material sealing function is improved and the sealing function at the beginning of operation can be secured.

[0013]

An embodiment will be described with reference to the drawings.

1 and 2, reference numeral 1 denotes an apparatus main body having a substantially rectangular cross section. The apparatus main body 1 has a dust collecting chamber 2 and an inverted L formed so as to surround two surfaces of an upper part and a right part of the dust collecting chamber 2. And an introduction chamber 3 having a shape.

The inverted L-shaped introduction chamber 3 comprises an upper horizontal introduction path 3a above the dust collection chamber 2 and a side vertical introduction path 3b communicating with the upper horizontal introduction path 3a. The introduction path 3a is partitioned by a partition plate 4, and the dust collection chamber 2 and the side vertical introduction path 3b are separated by a separator 5 that catches a lightweight object. In the drawing, the inclined plate 4a is provided obliquely downward on the partition plate 4, but the partition plate 4 alone may be provided, or the partition plate 4 itself may be inclined. By tilting in this manner, stagnation of lightweight objects can be prevented.

Numeral 6 designates an inlet for dust-containing air containing a light-weight material. The inlet 6 is provided at the side vertical inlet 3b of the upper horizontal inlet 3a.
It is formed at a more distant position, that is, at the center of the leftmost end shown. It is desirable that the inflow port 6 is located farthest from the side vertical introduction path 3b, but there is a distance L between the inflow port 6 and the side vertical introduction path 3b, and the dust-containing air is sufficiently dispersed and rectified. In this case, it may be near the left end in the figure.

As shown in FIG. 1, the separator 5 has a large number of wires 7 having a diameter of 2 to 3 mm arranged at regular intervals 8 in a vertical direction as shown in FIG.
(Part of the partition plate 4 or a separate member), and is formed by hanging the lower end in a free state. In this embodiment, there are four stages, but any number of stages such as one stage may be used. The diameter of the wire 7 is 2 to 5 mm, and the interval 8 is 5
５０50 mm (preferably about 15 mm).

On the other side of the dust collection chamber 2 (on the side opposite to the side vertical introduction path 3b), there are provided a number of openings 1 provided on the side wall of the apparatus body 1.
A clean room 12 is provided continuously around 1. The filter 1 is inserted into the opening 11 through the retainer plate 10 for retaining the filter shape.
3 is installed horizontally. As shown in FIG. 2, the filter 13 has a rectangular shape, and has a bag shape in which only a portion corresponding to the opening 11 is opened. I do. The filter 13 is made of the most common filter cloth, but may be another filter.

A hopper 14 integrated with the apparatus main body 1 is provided below the dust collecting chamber 2 of the apparatus main body 1, and a dust collecting means 15 is provided below the hopper 14. The dust collecting means 15 includes a transfer screw conveyor 15a extending over the entire length of the lower portion of the hopper 14, and a discharge rotary valve 1 provided at the end side of the transfer screw conveyor 15a.
5b.

A discharge chute 16 integrated with the apparatus main body 1 is also provided below the side vertical introduction path 3b of the apparatus main body 1, and a lightweight object collecting means 17 is provided below the discharge chute 16. The lightweight material collecting means 17 includes a transfer screw conveyor 17a extending over the entire length of the lower portion of the discharge chute 16, an extrusion screw conveyor 17b provided in communication with a lower end of the transfer screw conveyor 17a, and an end of the extrusion screw conveyor 17b. And a damper 18 provided in the opening 17c.

The end of the casing and the screw of the extrusion screw conveyor 17b are reduced in diameter at the side of the terminal opening 17c so that a material seal, that is, a lightweight material is extruded while being compressed and filled. Inflow is blocked. The damper 18 has a function of preventing the inflow of outside air from the terminal opening 17c until the light-weight material is filled in the extrusion screw conveyor 17b, that is, at the beginning of operation. Reference numeral 19 denotes a clean air outlet provided in the clean room 12.

The bag filter device having this configuration is incorporated in place of the pre-duster device F and the bag filter device G shown in FIG.

The operation of the above embodiment will be described below.

The dust-containing air discharged from each of the waste treatment apparatuses, ie, the crusher A, the magnetic separator B, the separator C, and the other D, is operated by the exhaust fan E provided at the end of the exhaust pipe. Is introduced into the bag filter device of this embodiment.

In the case where the sorting machine C is of a wind power type in particular, by blowing in air, light-weight materials such as sheets, tapes, cords, etc., of paper and plastics are separated and floated by the air blowing, and are discharged. The air is sucked and discharged together with the air from the sorter C by the blower E.

The dust-containing air containing the light-weight material flowing from the inlet 6 of the bag filter device at a considerable speed (for example, 20 m / s) collides with the inclined plate 4a of the upper horizontal introduction passage 3a, and then the upper horizontal introduction passage 3a. Although it flows down, the inflow port 6 is formed at a position away from the side vertical introduction path 3b, so in the process, it flows while spreading in a substantially horizontal direction, and its speed is greatly reduced. The dust-containing air diffused at a low speed in this manner is deflected downward above the side vertical introduction path 3b, while the lightweight object a therein is reduced by inertia due to the decrease in the speed. As a result, the device body 1 separates from (or jumps out of) the dust-containing air, falls under its own weight near the side wall of the apparatus main body 1, or collides with the side wall and falls as indicated by the arrow. As described above, the dust-containing air is sufficiently rectified in the upper horizontal introduction passage 3a, so that the separation from the lightweight object a is reliably performed.

The dust-containing air b deflected downward flows down in the side vertical introduction path 3b, passes through the separator 5 of the side vertical introduction path 3b, enters the dust collection chamber 2, and is filtered by the filter 13. Is done. That is, the dust c adheres to the outer surface of the filter 13, and the clean air d that has entered the filter 13 enters the clean room 12 and is discharged from the discharge port 19 to the atmosphere via the blower E. On the other hand, the light object a loses its inertia and
Along the side wall of the container, gravity sinks in the side vertical introduction path 3b, and is collected from the terminal opening 17c through the discharge chute 16, the lightweight object collecting means 17, that is, the transfer screw conveyor 17a, and the extrusion screw conveyor 17b. At this time, the damper 18 of the terminal opening 17c is pushed open by a lightweight object.

Here, when the dust-containing air passes through the filter 13, it is set (at least 25 mmAq or more) so that a predetermined pressure difference (pressure loss) is generated between the inside and the outside of the filter 13. When passing through the gap 8 of the separator 5 via the side vertical introduction path 3b, the flow rate per unit area becomes substantially uniform over the entire surface. For this reason, the light material a hardly gets caught (entrained) in the dust-containing air b and flows into the dust collection chamber 2.

For example, even if a part of the light-weight material tries to enter the dust collecting chamber 2, the light-weight material is caught by the separator 5 and collected. The wire 7 will fall off and fall due to the vibration and gravity of the lower end of the wire 7 due to the collision of the airflow and the lightweight object. Therefore, an increase in pressure loss due to the attachment of the lightweight object to the filter 13 is significantly suppressed, and the removal is significantly reduced.

The dust c collected by the filter 13
Is dusted off by a separately provided known dust removing means (for example, a method in which compressed air is blown into the filter 13 from a backwash air nozzle incorporated in the cleaning chamber 12 or a backwashing method), and dust is collected. Collected by the use means 15. That is, it is recovered via the transfer screw conveyor 15a and the discharge rotary valve 15b.

As the filter 13, a filter (filter cloth) of a commonly used dust collecting apparatus has a pressure loss (13 mmAq).
) Is small and uniform inflow of dust-containing air into the dust collection chamber 2 cannot be expected, so that a pressure loss (at least 25 mmAq or more) for causing uniform dust-containing air to flow into the dust collection chamber 2 is generated. Then, the outer surface of the bag filter is pre-coated with lime or another filter aid or laminated.

In the above embodiment, the filter 13 is placed horizontally in relation to the side vertical introduction path 3b. However, the filter 13 may be placed in a suspended state in which the opening 11 is on the upper side. At this time, the clean room 12 is also provided on the upper surface side.

In the above embodiment, the light-weight material a and the dust c are separately collected by the dust-collecting means 15 and the light-weight material collecting means 17, respectively. However, as shown in FIG. 3 and FIG. The screw conveyor 20 with a material seal function is provided by extending and connecting the extruding screw conveyor 17b of the lightweight material collecting means 17 to the transfer screw conveyor 15a of the dust collecting means 15 to thereby reduce the weight of the lightweight material a. The dust c can be merged and collected.

[0034]

The present invention is embodied in the form described above, and has the following effects.

[0035] Since a pre-duster device can be omitted in an exhaust pipe system of a refuse treatment plant or the like, not only space saving and simplification of the process but also contribution to reduction of equipment costs and operation costs can be achieved. It is.

Further, since the dust-containing air is sufficiently diffused and rectified in the upper horizontal introduction passage 3a, a light-weight object is very reliably separated from the air.

Further, the dust-containing air is supplied to the side vertical introduction path 3b.
, The air passes through the separator 5 at low wind speed and evenly, so that the inflow of the separated lightweight material into the filter 13 is greatly reduced, and the rise in pressure loss accompanying the attachment of the lightweight material to the filter 13 is greatly suppressed. In addition, even if some light-weight objects are entrained in the air, they are surely collected by the separator 5.

In addition, air leakage at the discharge section can be prevented with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a bag filter device according to the present invention.

FIG. 2 is a partially broken perspective view showing the embodiment.

FIG. 3 is a cross-sectional view of another embodiment.

FIG. 4 is a partially cutaway perspective view of another embodiment.

FIG. 5 is a flow sheet diagram showing an exhaust pipe system in a conventional waste treatment plant and the like.

[Explanation of symbols]

 Reference Signs List A Crusher B Magnetic separator C Sorter D Other processing equipment E Air blower F Preduster device G Bag filter a Lightweight object c Dust 1 Device main body 2 Dust collection chamber 3 Introducing chamber 3a Upper horizontal introduction path 3b Side vertical introduction path 4 Partition plate 4a Inclined plate (inclined partition plate) 5 Separator 6 Inflow port 7 Wire rod 8 Interval 9 Transfer member 10 Retainer plate 11 Opening 12 Clean room 13 Filter 14 Hopper 15 Dust collection means 15a Screw conveyor for transfer 15b Rotary valve for discharge 16 Discharge chute 17 Light weight object collecting means 17a Screw conveyor for transfer 17b Screw conveyor for extrusion 17c Terminal opening 18 Damper 19 Discharge port 20 Screw conveyor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masafumi Yoshioka 2--24-20 Kusadocho, Fukuyama City Inside Hokos Co., Ltd.

Claims (4)

[Claims] 1. A dust collecting chamber 2 in which a large number of filters 13 are arranged in an apparatus main body 1 having a substantially rectangular cross section, and an inverted L surrounding two surfaces of an upper portion and one side portion of the dust collecting chamber 2. And the upper L-shaped introduction chamber 3 formed by providing a partition plate 4 at the boundary between the two chambers 2 and 3.
And a side vertical introduction passage 3b provided with a separator 5 for separating the lightweight material a from the dust-containing air at the boundary surface between the two chambers 2, 3. The inlet 6 of the upper horizontal introduction passage 3a A cleaning chamber 12 formed at a position away from the introduction path 3b and having a discharge port 19 for clean air on the other side of the dust collection chamber 2 is provided continuously, and a sealing function is provided below the dust collection chamber 2 of the apparatus main body 1. The bag filter device is characterized in that dust collecting means 15 having the following structure is continuously provided, and lightweight material collecting means 17 also having a sealing function is provided below the vertical introduction path 3b of the apparatus main body 1. 2. The dust collecting means 15 has a discharge portion formed of a rotary valve 15b to secure a sealing function. The lightweight material collecting means 17 has a discharge portion formed of a screw conveyor 17b.
The bag filter device according to claim 1, wherein the material sealing function is ensured by reducing the diameter of the casing (7b) so that the lightweight article (a) is extruded while being compressed and filled. 3. A discharge section of the dust collecting means 15 and the light-weight material collecting means 17 is constituted by a screw conveyor 20 extending between the both, and the diameter of the casing of the screw conveyor 20 is reduced so that the dust c and the light-weight material a are reduced. The bag filter device according to claim 1, wherein a material sealing function is secured by being pushed out while being compressed and filled. 4. A suspended damper 18 for closing the screw conveyors 17b, 20 is provided at the terminal openings of the screw conveyors 17b, 20. The bag filter device according to claim 2, wherein the end filter is opened by swinging with a pushing force.