JPH08103616A - Moving pulse jet type bag filter - Google Patents

Abstract

PURPOSE: To detect the breakage of a bag at low cost and with high precision by eliminating the variance of jetted quantity and the jet pressure of high pressure air. CONSTITUTION: In a pulse jet type bag filter, a lot of bags 5 for capturing and filtering dust on the outer side face in a dust collecting chamber are provided, and purified air from which dust has been filtered off by the bags 5 is caused to flow into a purifying chamber, and also a high pressure gas jetting mechanism 31 for jetting high pressure gas from the purifying chamber side into the bags 5 to blow off dust stuck on the bags 5 is movably installed in the purifying chamber. In the high pressure gas jetting mechanism 31, plural nozzles arranged directly on an accumulator 32 and facing base end openings of the bags 5 and diaphragm solenoid valves 39 installed between the accumulator 32 and the nozzles 33 and separately undergoing opening and closing control are provided to restrain the occurrence of uneven pressure distribution. The high pressure gas jetting mechanism 31 is provided with broken bag detecting air inlet pipes 35 facing the base end openings of the bags 5 to detect the bags line by line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving pulse jet type bag filter for filtering dust in the air in a factory or the like, and more particularly to a moving pulse jet type bag filter equipped with a high pressure gas jetting mechanism for removing dust adhering to the bag. Regarding

[0002]

2. Description of the Related Art A pulse jet type bag filter having a function of ejecting a high-pressure gas into a bag to remove dust adhering to the outer surface of the bag is generally known. In this case, if a nozzle (which may be a Venturi) for injecting high-pressure air and a pulse pipe (an air pipe for supplying high-pressure air to the nozzle) to which the nozzle is attached are provided corresponding to all the bugs that are arranged, It is desirable to make the pulse pipe mobile, as the number will be too large.

Examples of the movable type include a "pulse jet dust collector" described in Japanese Patent Laid-Open No. 62-152512, which is equipped with a rotary movable pulse pipe, and a sliding movable pulse pipe. Further, there is a "exhaust gas cleaning bag filter" described in JP-A-2-164411, and a "dust collector" described in JP-A-5-305210 in which only a venturi (nozzle) is moved.

However, in these cases, since the high-pressure air supply tank (accumulator) is provided at a position apart from the nozzle (venturi), the pressure loss in the pipe is large and the amount of air blown out is limited.

Further, when the rotary movement type pulse pipe is provided, in addition to the problems such as the pressure loss inside the pipe, there is a problem that the dead space in which the bugs cannot be arranged becomes larger as the position goes to the outer circumference. This is because when high-pressure air is jetted from a nozzle provided on a rotating linear pulse pipe, the position of the nozzle and the bag will not match unless the bag is arranged radially from the center of rotation of the pulse pipe. is there. If the bag is also provided in the dead space, the nozzle and the base end opening of the bag may not be aligned with each other, and high-pressure air may be blown to the edge of the base end opening. in this case,
Problems such as damage and dropping of bugs will occur.

As an example of solving these problems, there is "Bag filter dust removing device" described in Japanese Patent Laid-Open No. 59-22621 previously proposed by the present applicant.

The dust removing device for the bag filter will be outlined with reference to FIGS. 3 to 5.

As shown in FIG. 3, the overall structure of the bag filter 1 is roughly divided into a dust collecting chamber 2 into which dust-containing air flows, and a partition plate 3 to separate the dust collecting chamber 2 from the dust. It is composed of a clean room 4 into which clean air flows.
The dust collection chamber 2 is provided with a large number of outer surface filtration type bugs 5. The bag 5 is formed in a long cylindrical shape having an open base end (upper end), and the open end side is attached to the partition plate 3. As a result, the bag 5 is in a state of extending from the partition plate 3 into the dust collection chamber 2. In the dust collection chamber 2, air containing dust flows into the inside from the outside surface of the bag 5, the dust is captured by the outside surface, and clean air flows into the cleaning chamber 4 from inside the bag 5. ing.

Inside the clean room 4, there is provided a high pressure gas jetting mechanism 7 having the construction shown in FIGS. 4 and 5. Reference numeral 10 in the drawing is a casing. Inside the casing 10, rails 11 and 12 are provided on both left and right sides (upper and lower sides in FIG. 4) with respect to the longitudinal direction thereof. This rail 11,1
2, a high pressure gas jetting mechanism 7 via rollers 13 and 14
Is movably installed. Two sprocket wheels 1 are provided on each of the front and rear sides (left and right sides in FIG. 4) of the casing 10 with respect to the longitudinal direction on the extension of the rails 11 and 12.
7, 18 are provided. These sprockets 1
7 and 18 are attached to rotating shafts 17A and 18A, and a chain 19 is stretched over them. One sprocket 17
Is on the drive side and is connected to the drive motor 21 via the speed reducer 20. The drive motor 21 is connected to a control device (not shown).

The high pressure gas ejection mechanism 7 is connected to each chain 19 and is moved by a drive motor 21. Below the high-pressure gas ejection mechanism 7, the partition plate 3 to which the base end of the outer surface filtration type bug 5 is attached is located. As a result, the base end opening of the outer surface filtration type bag 5 is arranged over the entire region where the high pressure gas ejection mechanism 7 moves.
Reference numeral 22 in the figure is a cable carrier that follows the movement of the high-pressure gas ejection mechanism 7, and an air supply hose 23, a solenoid valve power source (not shown), and the like are connected to the high-pressure gas ejection mechanism 7 via the cable carrier 22.

As shown in FIGS. 6 and 7, the high pressure gas ejection mechanism 7 has a cylindrical accumulator 25 for storing high pressure air supplied from an external supply system (not shown) via an air supply hose 23, A pulse pipe 26 arranged in parallel with the accumulator 25, nozzles 27 arranged on the lower side surface of the pulse pipe 26 over the entire length thereof at regular intervals, the pulse pipe 26 and the accumulator 25.
And a diaphragm type electromagnetic valve 28 for connecting the high pressure air in the accumulator 25 into the pulse pipe 26 as required.

The pulse pipe 26 is set to have a length corresponding to one horizontal row of each external filtration bag 5 arranged vertically and horizontally, and is arranged in parallel with the accumulator 25 so that the external filtration of one horizontal row is performed. It covers the entire base end opening of the expression bug 5. The nozzle 27 is on the lower side of the pulse pipe 26,
The same number as the bugs 5 in a row are provided, and the bugs 5 face the base end openings of the bugs 5, respectively. The accumulator 25 and the pulse pipe 26 are connected at one location, and the opening and closing is controlled by only one diaphragm type solenoid valve 28. That is, when the diaphragm solenoid valve 28 is opened, high-pressure air is supplied from the accumulator 25 into the pulse pipe 26 and is simultaneously ejected from the nozzles 27 into the outer surface filtration type bugs 5 and the outer surface filtration type bag 5 Dust adhering to the outer surface is removed.

As an example of detecting damage to the bugs 5, there is known one in which a pipe faces each of the bugs 5 and the air in the bugs 5 is sampled by this pipe to detect the dust concentration. As an example of this, there is known a "damaged filter cloth detecting device in a bag filter" described in Japanese Patent Laid-Open No. 1-307424, which uses a fixed sampling pipe. Further, as an example of detecting the dust concentration of the entire clean air that has passed through the filter cloth (bug 5) and flowed into the clean room, "Detection method for broken filter cloth of outer surface filtration type bag filter" described in JP-A-4-104808. There is.

In the "damaged filter cloth detecting device for a bag filter" described in Japanese Patent Laid-Open No. 1-307424, a large number of filter cloths are provided with sampling pipes to detect the damage of the filter cloth.

Further, in the "external surface filtration type bag filter broken filter cloth detection method" described in JP-A-4-104808, high-pressure gas is sequentially supplied to a header pipe arranged for each row of bag, The bug is closed in each row, and the dust concentration in the clean gas that has passed through the other bugs is measured. As a result, it is possible to detect that the bug in the row in which the dust concentration is low is damaged.

[0016]

By the way, in the above-mentioned conventional high-pressure gas jetting mechanism 7, the high-pressure air in the accumulator 25 is once supplied into the pulse pipe 26 via the diaphragm type electromagnetic valve 28, and then each nozzle 27 is supplied. Is injected into each bug 5 via. At this time, the pulse pipe 2
In 6, the pulse wave due to the opening of the diaphragm type electromagnetic valve 28 propagates and reciprocating air vibration occurs. This causes interference and makes the pressure distribution non-uniform. This non-uniform pressure distribution changes every time the diaphragm type solenoid valve 28 is opened, and the injection amount and injection pressure of the high pressure air from the nozzle 27 vary.

This variation has a great influence on the state of the outer surface filtration type bag 5. That is, when the amount of air is too large, a blow-out phenomenon occurs when the air is injected into the external filtration bag 5, and dust passes through the external filtration bag 5 and flows into the clean room 4. This leads to air pollution.

When the amount of air is small, the outer surface filtration type bag 5
The dust adhering to the dust cannot be efficiently removed, and the pressure loss when sucking air from the dust collection chamber 2 side to the clean chamber 4 side increases. This means that a large amount of energy is required to suck air into the clean room 4, which is a waste of resources.

The state in which the air amount is excessive or small is 1
Which can occur in one pulse pipe 26,
Drastic measures are necessary for this variation.

Further, in the "damaged filter cloth detection device for a bag filter" described in JP-A-1-307424, since a large number of filter cloths are provided with sampling pipes, the device becomes large-scale and costly. Grows.

Further, in the "external surface filtration type bag filter broken filter cloth detection method" described in Japanese Patent Application Laid-Open No. 4-104808, high-pressure gas is sequentially supplied to a header pipe arranged for each row of bag, The bag is closed for each row, and the dust concentration of the entire clean gas flowing into the secondary chamber (clean room 4) that has passed through the other bugs is measured, so it is difficult to detect if the bug is slightly damaged. , The measurement accuracy is poor.

The present invention has been made in view of the above problems, and it is a moving pulse jet type that can eliminate the variation in the injection amount and injection pressure of high-pressure air and can detect bug breakage at low cost and with high accuracy. The purpose is to provide a bug filter.

[0023]

In order to solve the above problems, a moving pulse jet type bag filter according to the first invention is provided with a dust collection chamber into which dust-containing air flows and a dust collection chamber. A large number of external filtration bags, a clean room into which clean air in which dust is filtered by the external filtration bag flows, and a high-pressure gas is movably provided in the clean room from the clean room side. In a moving pulse jet type bag filter equipped with a high-pressure gas jetting mechanism for jetting out dust adhered to the outer surface of the bag, the high-pressure gas jetting mechanism is an accumulator that stores high-pressure gas, and directly to this accumulator and A plurality of nozzles respectively arranged facing the base end opening of each of the bugs, and a diamond provided between the accumulator and each of the nozzles to control opening / closing between them. Characterized by comprising a ram solenoid valve.

In the moving pulse jet type bag filter according to the second aspect of the present invention, the high-pressure gas jetting mechanism is arranged so as to face the base end opening of the bag, as in the case of the plurality of nozzles. It is characterized by having a tube.

[0025]

In the first aspect of the invention, the high pressure air is directly ejected from the plurality of nozzles directly attached to the accumulator to the base end opening of each bag by controlling the opening / closing of the diaphragm type solenoid valve. As a result, there is no space that creates an uneven pressure distribution, and it is possible to eliminate variations in the injection amount and injection pressure of high-pressure air.

In the second aspect of the invention, since the bag breakage detection intake pipe is arranged in the high pressure gas jetting mechanism movably provided in the clean room, the bug breakage detection suction pipe is moved by the high pressure gas jetting mechanism. The presence or absence of damage to each bug can be detected line by line.

It is preferable that the intake pipe for detecting the damage of the bug is disposed so as to face the base end opening of the bug next to the bug facing the nozzle.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. The overall configuration of the mobile pulse jet bag filter according to the present embodiment is almost the same as that of the conventional pulse jet bag filter described above, except for the high-pressure gas ejection mechanism, and therefore, the same portions are denoted by the same reference numerals. The description is omitted.

The high-pressure gas jetting mechanism 31 of this embodiment has an accumulator 32 for storing high-pressure gas (high-pressure air, etc.) and a nozzle 33 directly connected to the accumulator 32.
And a diaphragm type solenoid valve 34 which is provided between each nozzle 33 and the accumulator 32 to control opening and closing.

The nozzles 33 are arranged corresponding to one row of the outer surface filtration type bugs 5 arranged in the vertical and horizontal directions, and are respectively provided in the up-down direction so as to face the base end opening of each bag 5. Has been. A diaphragm solenoid valve 34 is attached to the upper end of each nozzle 33.
Each nozzle 33 is individually connected to the accumulator 32 via the diaphragm type solenoid valve 34.

At the position of each nozzle 33 on the accumulator 32 side, the same number of intake pipes 35 for detecting bag damage as the number of nozzles 33 are provided. The intake pipe 35 for detecting the bag breakage is integrally attached to the accumulator 32, and
Is arranged so as to face Bug 5 next to Bug 5. Further, as with the nozzle 33, the bag breakage detection intake pipe 35 is provided with a plurality of outer surface filtration type bugs 5 arranged vertically and horizontally.
Are arranged corresponding to one row of the outer surface filtration type bag 5 and suck the air in each outer surface filtration type bag 5. This bug breakage detection intake pipe 35
Moves along with the movement of the high-pressure gas jetting mechanism 31, sucks the air in all the outer surface filtration type bugs 5 and inspects for damage.

The detecting device for the intake pipe 35 for detecting bag breakage is constructed as shown in FIG. Reference numeral 36 in the drawing denotes a high-concentration dust detector connected to each of the intake pipes 35 for detecting bug damage. A suction pump 37 is provided on the downstream side of the high-density dust detector 36. This suction pump 3
The air in each outer surface filtration type bag 5 is sucked from the bag breakage detection suction pipe 35 by 7 and is sucked to the high-concentration dust detector 36. The high-density dust detector 36 detects the concentration of dust in the sucked air. The air sucked by the suction pump 37 is discharged to the dust collection chamber 2 side. High concentration dust detector 3
6, a control device 39 is connected to the high density dust detector 36.
The presence or absence of a high concentration signal from is monitored. Control device 39
Is also connected to each diaphragm type solenoid valve 34 and outputs a pulse signal to control the opening and closing of each diaphragm type solenoid valve 34. The opening / closing control of the diaphragm type solenoid valve 34 is
All diaphragm type solenoid valves 34 may be opened and closed at the same time, or may be opened and closed sequentially from one side.

Reference numeral 41 in the figure is a counter, which detects a pulse signal output by the control device 39 for opening and closing the diaphragm type solenoid valve 34, and counts and displays the number of pulse signals. . In addition to the pulse signal, a reset signal for resetting the counted number is input to the counter 41, and switches 42 and 43 are provided for each. These switches 42 and 43
Are controlled by the controller 39. That is, when the high-concentration dust detector 36 detects high-concentration dust from the air, the high-concentration signal is output to the control device 39, and the control device 3
At 9, the switch 42, 43 is turned off in response to the input of the high density signal.

At this time, the counter 41 counts up one by one each time high-pressure air is ejected from the extreme end of the arrangement of the bugs 5. Then, on the counter 41, it is displayed which column of the array of the bugs 5 the high-pressure gas ejection mechanism 31 is located from the most end. As a result, when the high density signal is output and the switches 42 and 43 are turned off, the counting by the counter 41 is stopped, and the count number at that time means the damaged position of the bug 5.

In the pulse jet type bag filter constructed as described above, the high pressure gas jetting mechanism 31 is moved on the rails 11 and 12 by the control of the drive motor 21, and each nozzle 33 is arranged in the first row of the arrangement of the bugs 5. The eyes are moved in order. First, a pulse signal is output by the control device 39 in the first row, each diaphragm solenoid valve 34 is opened, and high pressure gas is injected from each nozzle 33 to the bag 5 in the first row. At this time, the high pressure gas is directly ejected from the accumulator 32 to the bag 5 via the nozzle 33. Since the pulse pipe 26 is not used as in the conventional case, there is no portion where an uneven pressure distribution occurs inside.

Then, the drive motor 2 is controlled by the controller 39.
1 is controlled, the high pressure gas ejection mechanism 31 is moved, each nozzle 33 is moved to the second row of the bag 5, and a pulse signal is output.

Along with the movement of the high-pressure gas jetting mechanism 31, the bag breakage detection intake pipe 35 sucks air from the inside of the bag 5 in the row adjacent to the injection position of the high-pressure gas by the nozzle 33, and the high-concentration dust detector is detected. The presence or absence of damage to the bug 5 is detected by 36. When the dust concentration in the air sucked by the high-concentration dust detector 36 is abnormally high, the high-concentration dust detector 36 determines that the bag 5 is damaged and issues an alarm. Note that each of the bag breakage detection intake pipes 35 is initially located in the first row of the bug 5, and is set to 1 before the first high-pressure air injection by the nozzle 33.
The dust concentration detection for the second time is performed.

As described above, the diaphragm type solenoid valve 34
By controlling the opening / closing of the high pressure air, the high pressure air is directly ejected from the plurality of nozzles 33 directly attached to the accumulator 32 to the base end opening of each bag 5, so that a non-uniform pressure distribution is generated inside like the conventional pulse pipe 26. Since there is no portion, it is possible to reliably eliminate the variation in the injection amount and injection pressure of the high pressure air from each nozzle 33.

Further, the bag breakage detection intake pipe 35 is provided in the high-pressure gas jetting mechanism 31 and is moved integrally, and the presence or absence of breakage is directly detected at the base end opening of each bug 5 and is carried out row by row. Therefore, while maintaining high detection accuracy,
It is possible to reduce costs by simply collecting devices for detecting bug damage.

A position detection proximity switch is preferably used to control the position where the high-pressure gas jetting mechanism 31 moves (the position where the nozzle 33 is aligned with the center of the base end opening of the outer surface filtration type bag 5). For example, rail 11,
On the 12th side, a detection block is provided in alignment with the moving position of the high-pressure gas ejection mechanism 31, and the high-pressure gas ejection mechanism 31 is provided.
A position detection proximity switch is provided on the side for accurate position control.

Further, the drive motor 21 is controlled by an inverter so that when the high-pressure gas is jetted, it is moved along the detection block, and after completion of one pass, it is returned to the initial position without being stopped by the detection block. Good.

Further, the inside of the accumulator 32 may be divided into a plurality of chambers, and high pressure gas may be supplied from the outside to each chamber. This has the effect of further stabilizing the injection pressure of the high-pressure gas.

[0043]

As described above, according to the moving pulse jet type bag filter of the present invention, the following effects can be obtained.

(1) The nozzles of the high-pressure gas injection mechanism are arranged directly on the accumulator and facing the base end opening of each bag, and the diaphragm type solenoid valve is provided between them, so that It is possible to reliably eliminate the variation in the injection amount and the injection pressure of the high-pressure air.

(2) Since the high-pressure gas injection mechanism is provided with the bag breakage detection intake pipe facing the base end opening of the bag together with the nozzle, the bug damage detection intake pipe moves integrally with the high-pressure gas injection mechanism. However, the presence or absence of breakage of each bug can be directly detected row by row, and the apparatus for detecting bug breakage can be simply put together and cost can be reduced while maintaining high detection accuracy.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a high pressure gas ejection mechanism of a moving pulse jet type bag filter according to the present invention.

FIG. 2 is a schematic side view showing the high-pressure gas ejection mechanism of FIG. 1 with a detection device provided therein.

FIG. 3 is a schematic front view showing a general configuration of a conventional pulse jet bag filter.

FIG. 4 is a plan view showing a high-pressure gas ejection mechanism of a conventional pulse jet bag filter and its moving system.

5 is a side view showing the high pressure gas ejection mechanism of FIG. 4 and its moving system.

FIG. 6 is a schematic front view showing a high-pressure gas ejection mechanism of a conventional pulse jet bag filter.

FIG. 7 is a schematic side view showing a high-pressure gas ejection mechanism of a conventional pulse jet bag filter.

[Explanation of symbols]

31 ... High-pressure gas ejection mechanism, 32 ... Accumulator, 33
... Nozzle, 34 ... Diaphragm type solenoid valve, 35 ... Intake pipe for detecting bag breakage, 36 ... High concentration dust detector.

Claims (2)

[Claims] 1. A dust collection chamber into which dust-containing air flows, a large number of outer surface filtration type bugs disposed in the dust collection chamber, and clean air in which dust is filtered by the outer surface filtration type bag. A moving pulse jet equipped with a cleaning chamber and a high-pressure gas ejection mechanism that is movably provided in the cleaning chamber and ejects high-pressure gas into the bag from the cleaning chamber side to remove dust adhering to the outer surface of the bag. In the bag filter, the high-pressure gas jetting mechanism, an accumulator for storing high-pressure gas, a plurality of nozzles respectively arranged directly facing this accumulator and facing the base end opening of each bag, the accumulator and each A moving pulse jet type bag filter, comprising a diaphragm type solenoid valve provided between nozzles and controlling opening and closing between them. 2. The moving pulse jet type bag filter according to claim 1, wherein the high-pressure gas jetting mechanism is arranged so as to face the base end opening of the bag, like the plurality of nozzles. A moving pulse jet type bag filter, which is equipped with an intake pipe for use.