JPH1057735A - Bag filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add the function of collecting lightweight materials such as sheets, tapes, cords and paper to a bag filter device without reducing dust collecting efficiency. SOLUTION: In a device body 1, the flow of dust containing air is deflected almost at a right angle to direct it toward filters 13, and also lightweight materials are removed by separators 5 on this side of the filters 13. That is, the dust containing air that contains lightweight materials is diffused and straightened in an upper horizontally introducing passage 3a, and also its flow velocity is decreased, and moreover, it flows in a side vertically introducing passage 3b to change its direction, allowing lightweight materials to be surely separated. The lightweight materials are blocked by the separators 5 to sharply decrease the inflow thereof to a dust collecting chamber 2. The separated lightweight materials descend in the side vertically introducing passage 3b and are discharged to the outside by a discharging means 17. On the other hand, after the dust containing air that has entered the dust collecting chamber 2 gets rid of dust by the filter 23, the purified air reaches a clean chamber 12 and is discharged to outside the device body 2 from a discharge port. Dust collected by the filters 13 descends in the duct collecting chamber 2 and is discharged from a dust recovering means 15.

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 kind, and an example of use is shown in FIG. FIG. 3 is a general flow sheet diagram of dust-containing air including light-weight materials discharged from each processing machine in a general waste and construction waste processing facility, etc., wherein A is a crusher, B is a magnetic separator, and C is a magnetic separator.
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 above-mentioned lightweight objects by utilizing 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]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a method of deflecting a flow of dust-containing air at a substantially right angle to a bag filter in a device body having a substantially rectangular cross section. 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.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The inside of an apparatus main body 1 having a substantially rectangular cross section is shown in FIG.
The dust collecting chamber 2 in which a large number of filters 13 are arranged and an inverted L-shaped introduction chamber 3 surrounding two surfaces of the upper part and one side of the dust collecting chamber 2 are formed. Room 3 is both rooms 2,
An upper horizontal introduction path 3a partitioned by providing a partition plate 4 at the boundary surface of the chamber 3, and a side vertical introduction path 3b provided with a separator 5 at the boundary surface of the two chambers 2 and 3 for separating lightweight materials from dust-containing air. A cleaning chamber having an inlet 6 provided in the upper horizontal introduction path 3a 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. 12
The dust discharging means 15 is continuously provided below the dust collecting chamber 2 of the apparatus main body 1, and the lightweight material discharging means 17 is continuously provided below the vertical introduction path 3b of the apparatus main body 1. is there.

As a result, the dust-containing air containing the light objects is diffused and rectified in the upper horizontal introduction passage 3a, the speed thereof is reduced, and the direction of the air is changed by flowing into the side vertical introduction passage 3b. Separated reliably. 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 along the side vertical introduction path 3b and is discharged outside by the discharge 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 discharging means 15.

The separator 5 can be formed by arranging a large number of wires 7 at regular intervals in the vertical direction, fixing the upper end thereof, and hanging the lower end in a free state. In this way, the captured sheet-like material can be smoothly separated.

The partition plate 4 is preferably inclined downward from the inflow port 6 toward the side vertical introduction path 3b. By doing so, the bottom surface of the upper horizontal introduction path 3a becomes a downwardly inclined surface, and the light object shifts to the side vertical introduction path 3b even if it has its own weight. That is, it is possible to minimize the possibility that a lightweight object stays in the upper horizontal introduction path 3a. This inclined surface may be formed by providing an inclined plate 4 a above the partition plate 4.

The dust collecting means 15 includes a screw conveyor 15a for transporting the entire length of the lower portion of the dust collecting chamber 2.
And a discharge rotary valve 15b provided at the end of the transfer screw conveyor 15a. By doing so, the screw conveyor 15a
All of the dust collected by is discharged smoothly, and
Airtightness is maintained by the rotary valve 15b.

The lightweight material collecting means 17 includes a transfer screw conveyor 17a extending over the entire lower portion of the side vertical introduction path 3b, and an extrusion screw conveyor provided in communication with a lower end of the transfer screw conveyor 17a. 17
b. In this way, all of the lightweight objects collected by the screw conveyor 17a are smoothly discharged. At this time, a damper 18 may be provided in the terminal opening 17c of the extrusion screw conveyor 17b. In this way, airtightness is ensured.

[0014]

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 portion and a right side 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 a 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), a number of openings 1 provided on the side wall of the apparatus main body 1 are provided.
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 collection 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.
Is installed. The light-weight object collecting means 17 includes the discharge chute 1
6 Screw conveyor 17a for transfer over the entire length of the lower part
And an extruding screw conveyor 17b provided in communication with a lower end of the transferring screw conveyor 17a and a damper 18 provided at an end opening 17c of the extruding screw conveyor 17b.

By reducing the diameter of the casing of the screw conveyor 17b for extrusion and the terminal opening 17c side of the screw, a material seal, that is, a lightweight material is extruded while being compressed and filled, so that outside air flows in from the terminal opening 17c. Is blocked. Further, the damper 18 has a function of preventing the inflow of outside air from the terminal opening 17c until the lightweight material is filled in the extrusion screw conveyor 17b, that is, at the beginning of operation. Reference numeral 19 denotes a cleaning 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, that is, 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 combined with a wind power in particular, by blowing in air, light-weight materials such as sheets, tapes, strings, etc., of paper and plastics are separated and floated by the air blow, 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 down 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 attempts to enter the dust collection chamber 2, the light-weight material attached to the wire 5 of the separator 5 is trapped 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 collected 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 with the opening 11 on the upper surface side. At this time, the clean room 12 is also provided on the upper surface side.

In the embodiment, the light-weight object and the dust are separately collected by the dust-collecting means 15 and the light-weight-object collecting means 17, respectively.
5 is connected to the transfer screw conveyor 15a of FIG. 5 by extending and extruding the screw conveyor 17b of the lightweight material collecting means 17 so that the lightweight material and dust are merged and collected, whereby the discharge rotary valve 15b is discharged. Can be omitted.

[0035]

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

[0036] Since the 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.

[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 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 Pre-duster device G Bag filter 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 (Inclination partition plate) 5 Separator 6 Inlet 7 Wire 8 Spacing 9 Passing member 10 Retainer plate 11 Opening 12 Clean room 13 Filter 14 Hopper 15 Dust collecting means 15a Screw conveyor for transfer 15b Rotary valve for discharge 16 Discharge chute 17 Light weight Collection means 17a Screw conveyor for transfer 17b Screw conveyor for extrusion 17c Terminal opening 18 Damper 19 Discharge port

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masafumi Yoshioka 2--24-20 Kusado-cho, Fukuyama-shi, Hiroshima Inside Hokos Co., Ltd.

Claims (7)

[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 lightweight material from dust-containing air at a boundary surface between the two chambers 2, 3. The inflow port 6 of the upper horizontal introduction passage 3a has a side vertical introduction passage. A cleaning chamber 12 is formed at a position distant from the passage 3b and has a discharge port 19 for clean air on the other side of the dust collection chamber 2. The dust collection chamber 2 is provided at a lower portion of the dust collection chamber 2 of the apparatus main body 1. Means 1
5. A bag filter device comprising: a plurality of light-emitting devices 5; and a light-weight discharge means 17 provided continuously below the vertical introduction path 3b of the apparatus main body 1. 2. The bug according to claim 1, wherein the separators 5 are formed by arranging a large number of wires 7 at regular intervals and in a vertical direction, fixing an upper portion thereof, and hanging a lower end thereof in a free state. Filter device. 3. The bag filter device according to claim 1, wherein the partition plate 4 is inclined downward from the inflow port 6 side toward the side vertical introduction path 3b. 4. An inclined plate 4a, which is inclined downward from said inflow port 6 side to said side vertical introduction path 3b side, is provided above said partition plate 4. Bag filter device. 5. A screw conveyor 15a for transferring the dust over the entire length of the lower portion of the dust collecting chamber 2.
The bag filter device according to any one of claims 1 to 4, further comprising: a discharge rotary valve 15b provided at an end of the transfer screw conveyor 15a. 6. The screw conveyor 17a extending over the entire length of the lower portion of the side vertical introduction path 3b, and the light-weight recovery means 17 is connected to an extruder provided at the lower end of the screw conveyor 17a. Screw conveyor 1
The bag filter device according to any one of claims 1 to 5, wherein the bag filter device comprises: 7. The bag filter device according to claim 6, wherein a damper (18) is provided in a terminal opening (17c) of the extrusion screw conveyor (17b).