JP2003220314A - Bag filter dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the most efficient function for dust shake-off in the bag filter dust collector capable of arbitrarily selecting dust collecting operation and backwashing operation to a plurality of bag filters and in the backwashing operation of the prescribed bag filters. <P>SOLUTION: In a bag filter dust collector capable of arbitrarily selecting a bag filter 2 for dust collecting operation and a bag filter 2 for backwashing operation by pulse-jet, a backwashing damper 3 capable of adjusting the opening degree is arranged at a flow path R2 for backwashing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filter type dust collector which exhibits a dust collecting function required for air purification such as combustion exhaust gas from a refuse incinerator and dust collecting in a foundry.

[0002]

2. Description of the Related Art Conventionally, a bag filter type dust collector has been widely used for combustion exhaust gas from a refuse incinerator and dust in a foundry for reasons such as economy and convenience of use. This type of bag filter type dust collector, in its use,
Since dust collection efficiency decreases due to dust accumulation on the bag filter, it is necessary to remove the accumulated dust at a predetermined time interval.As a method for that purpose, the pulse jet method is generally used. ing.

As the bag filter type dust collector, the present invention performs the dust collecting operation by opening the suction passage on the exhaust fan side to the bag filter by opening the poppet damper.
By the closing operation, the exhaust passage on the air exhaust side to the bag filter is shut off, and at the same time, one is communicated with the outside air, and the other is opened with the backwashing flow passage where it communicates with the suction air passage on the exhaust air blower side. It is intended to solve the problem in the bag filter type dust collector configured to perform the backwashing operation of the bag filter and thereby the backwashing operation of the bag filter by the pulse jet.

[0004]

That is, in the above-described bag filter type dust collector of the prior art, at the time of backwashing operation of the bag filter, the poppet damper is closed to shut off the suction passage on the air blower side of the bag filter at the same time. , One of which communicates with the outside air, and the other of which opens a backwashing passage where it communicates with the exhaust passage on the side of the exhaust fan, and a passage which leads to the outside air for releasing the negative suction pressure of the exhaust fan that is constantly operating. Need to be formed. This is because the bag filter is constricted by the initial negative pressure in the dust collection chamber and the pulse jet is generated in it by simply shutting off the suction passage on the blower side to the bag filter chamber by closing the poppet damper. Even if blown in, it is difficult to enter deep inside, and the bag filter does not easily vibrate,
This is because the dust-dispelling action becomes worse, and in order to eliminate this cause, the bag filter is loosened in advance by communicating with the atmosphere.

Up to now, the backwash passage was opened by operating the poppet damper in order to introduce the air into the atmosphere. However, the poppet damper is used as a bag filter for backwashing. Since it is configured to perform both the original function of closing and the function of opening the backwashing flow passage, it has a two-position switching system configuration, and therefore the backwashing flow passage It was impossible to adjust the flow path adjustment for opening and closing.

As a result, if the backwash flow passage is simply communicated with the atmosphere when introducing the air into the bag filter, the flow rate of the air flowing into the backwash flow passage becomes large, and the bag flow rate increases. The negative pressure in the filter is greatly reduced, the bag filter is completely loosened, and due to the negative pressure inside the dust collection chamber, it becomes an expanded state, and even if a pulse jet is blown into it, the bag filter is still efficient. Is difficult to vibrate, and the delicate pressure-removing effect on the dust is a problem.

In other words, it is most preferable that the vibration of the bag filter due to the pulse jet is performed in a moderately loose state of the bag filter through the reality of dust removal of the bag filter, and the bag filter is isolated by the conventional poppet damper. From the state of closing,
It was found that an efficient dust-dispelling action cannot always be expected simply by making an improvement such that this is simply conducted to the atmosphere.

In view of such a problem, the present invention is a bag filter type dust collector in which a dust collecting operation and a backwashing operation can be arbitrarily selected for a plurality of bag filter chambers. The purpose is to obtain the most efficient dust-dispelling action.

[0009]

In order to achieve the above object, a bag filter type dust collector according to the present invention has a plurality of bag filters 2 arranged side by side, and each of the bag filters 2 is provided with a poppet damper 1. The dust collecting operation is performed by opening the exhaust passage side suction flow path R1 for the bag filter 2 by opening the poppet damper 1.
The closing operation shuts off the blower-side suction flow path R1 for the bag filter 2, and at the same time opens the backwash flow path R2 where one communicates with the outside air and the other communicates with the blower-side suction flow path R1. In a bag filter type dust collector configured to perform backwashing operation by pulse jet, and to optionally select bag filter 2 for dust collection operation and bag filter 2 for backwashing operation by pulse jet, The backwashing flow path R2 is provided with a backwashing damper 3 whose degree of opening can be freely adjusted.

In the present invention, the suction flow path R on the exhaust fan side
1 is provided with a differential pressure gauge 5 for detecting a differential pressure between the dust collecting chamber 4 and
By adjusting the backwashing damper 3, the differential pressure between the exhaust passage R1 and the dust collecting chamber 4 is -10 mmAq to -20 m.
It is preferably adjusted to be mAq.

According to the present invention, one suction-side suction flow passage R1 shared by the plurality of bag filters 2 is provided, and one backwash passage R2 for the plurality of bag filters 2 is provided. It is preferably shared.

In the present invention, the bag filters 2 are arranged side by side in a lateral direction, and the cleaning air is introduced from the upper part of the dust collecting chamber 4, the purified air is taken out in the lateral direction, and then discharged from below. Is preferred.

In the present invention, it is preferable that the bag filters 2 are vertically arranged side by side so that the cleaning air is introduced from the lower part of the dust collecting chamber 4 and the cleaning air is taken out upward.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION According to the bag filter type dust collector of the present invention, the blower side suction passage R1 for the bag filter 2 is shut off by closing the poppet damper 1 in order to remove dust from the bag filter by a pulse jet. Then, the bag filter is initially constricted due to the negative pressure in the dust collection chamber 4, so that the backwash flow path R2 is not simply opened, but the backwash damper 3 is adjusted to adjust the inflow amount of the atmosphere. (Adjustment of suction resistance), the narrowed state of the bag filter can be made into a loose state that is preferable for vibration, and the pulse jet can be easily blown into the interior to efficiently remove dust. .

By adjusting the backwashing damper 3, even if the negative pressure in the dust collecting chamber 4 varies due to the dust collecting load or the like, it is possible to adjust the inflow to the atmosphere. With the bag filter in a suitable loose state, suitable dust removal can always be performed.

In the present invention, the suction flow path R on the exhaust fan side
1 is provided with a differential pressure gauge 5 for detecting a differential pressure between the dust collecting chamber 4 and
By adjusting the backwashing damper 3, the differential pressure between the exhaust passage R1 and the dust collecting chamber 4 is -10 mmAq to -20 m.
When it is adjusted to be mAq, the suction amount of the backwash flow channel R2 can be suitably adjusted, and the looseness of the bag filter can be made suitable, and thus the most efficient Delivers good dust removal (backwash function).

In the present invention, one blower-side suction flow path R1 shared by the plurality of bag filters 2 is provided, and one backwash flow path R2 for the plurality of bag filters 2 is provided. When shared, the structure for exhibiting the above-mentioned action is simple.

In the present invention, the bag filters 2 are formed in a flat tubular shape and are arranged side by side, and purifying air is introduced from the upper part of the dust collecting chamber 4, and the purifying air is taken out in the lateral direction and then downward. Or the bag filters 2 are formed in a cylindrical shape and are vertically arranged side by side, and purifying air is introduced from the lower part of the dust collecting chamber 4 and the purifying air is taken out upward. In any of the above configurations, the backwash damper 3 described above is used.
Can be easily laid. Needless to say, the opening / closing control of the backwash damper 3 may be performed manually based on the differential pressure gauge 5 as in the embodiment, or may be performed automatically.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the bag filter type dust collector according to the present invention will be described in detail below with reference to the drawings. Figure 1
FIG. 3 is a partially cutaway perspective view of a bag filter type dust collector of a type in which bag filters 2 each having a flat tubular shape are arranged side by side in a horizontal direction, and are configured as follows. That is, a plurality of flat tubular bag filters 2 are horizontally arranged side by side (7 chambers in the horizontal direction, upper and lower two stages).
One set of poppet dampers 1 is provided for each set, and an opening operation of the poppet damper 1 opens the suction passage R1 on the exhaust fan side to the bag filter 2 to perform a dust collecting operation and then to close it. At the same time as shutting off the blower-side suction flow passage R1 for the bag filter 2 by operation, at the same time opening the backwash flow passage R2 where one communicates with the outside air and the other communicates with the blower-side suction flow passage R1. hand,
The bag filter 2 for dust collection operation and the bag filter 2 for backwash operation by pulse jet can be arbitrarily selected.

FIG. 2 is a vertical cross-sectional side view showing the main part of the pulse jet unit 6, which is constructed such that a backwashing pulse is jetted to each bag filter 2 from a vertically extending pipe. Since the specific configuration belongs to the public knowledge, detailed description thereof is omitted here.

Further, as shown in FIGS. 1 and 3, in the present invention, a backwashing damper 3 having an adjustable opening is provided in the backwashing passage R2. Figure 3 shows a series of bug filters 2.
Among them, one set, that is, the bag filter 2 at the left end in the drawing is the target of backwashing, and the dust collecting operation is performed on the right side thereof. In this case, an air intake port 7 is opened on the side of the backwash flow passage R2 that is in communication with the atmosphere, from which air for backwashing is sucked.

This is shown in more detail in FIGS. 4 and 5. FIG. 4 shows the position and air flow of the poppet damper 1 when performing the dust collection operation, and FIG. 5 shows the position and air flow of the poppet damper 1 when performing the backwash operation. That is,
During the backwash operation, as shown in FIG. 5, the poppet damper 1
Shuts off the suction-side suction flow path R1 to the bag filter 2 and allows the backwash flow path R2 to communicate with the bag filter 2. In the figure, 8 is a rod of a cylinder for operating the poppet damper 1.

A differential pressure gauge 5 is provided for detecting the differential pressure between the exhaust passage side suction passage R1 and the dust collecting chamber 4, and the backwash damper 3 adjusts the exhaust passage side suction passage R1. The pressure difference with the dust collection chamber 4 is preferably −10 mmAq to −.
It is adjusted to be 20 mmAq (may be a different value depending on the performance of the dust collector).

In the present embodiment, one blower-side suction flow path R1 shared by the plurality of bag filters 2 is provided, and one backwash flow path R2 for the plurality of bag filters 2 is provided. It is shared by. However, there may be a case where the backwashing flow passage R2 is provided in plural.

Further, this embodiment is based on the bag filter 2 described above.
However, they are configured in a flat tubular shape and are arranged side by side in a lateral direction. The cleaning air is introduced from the upper part of the dust collection chamber 4, the purified air is taken out in the lateral direction, and then discharged from below. As shown in FIGS. 6 to 8, the bag filter chambers 2 are formed in a cylindrical shape and are vertically arranged side by side, and purifying air is introduced from the lower part of the dust collecting chamber 4 and the purified air is taken out upward. It may be configured as follows. Since the function itself of the dust collector having the arrangement form of the bag filter 2 is not different from that of the lateral arrangement described above, the reference numbers of the constituent members of the respective parts are described, but the description of the members and the operation are omitted. To do.

[0026]

According to the present invention, in a bag filter type dust collector in which dust collection operation and backwash operation can be arbitrarily selected for a plurality of bag filters, in the backwash operation of a predetermined bag filter, the bag filter It is possible to appropriately reduce the negative pressure inside the so that the bag is easily relaxed, so that the bag filter due to the pulse jet is easily vibrated, and the dust removing effect by the backwash can be enhanced. Other specific effects of the present invention are as described in detail in the above-mentioned embodiments of the invention and the embodiments.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an entire bag filter type dust collector according to the present invention.

FIG. 2 is a vertical cross-sectional side view of a main portion of a pulse jet unit of a bag filter type dust collector according to the present invention.

FIG. 3 is an operation explanatory view of a poppet damper portion of the bag filter type dust collector according to the present invention.

FIG. 4 is an enlarged vertical sectional side view for explaining one operation of the poppet damper portion of the bag filter type dust collector according to the present invention.

FIG. 5 is an enlarged vertical sectional side view for explaining one operation of the poppet damper portion of the bag filter type dust collector according to the present invention.

FIG. 6 is a partial cutaway perspective view showing another embodiment of the bag filter type dust collector according to the present invention.

FIG. 7 is an enlarged vertical sectional side view for explaining one operation of the poppet damper portion of the bag filter type dust collector of another embodiment according to the present invention.

FIG. 8 is an enlarged vertical sectional side view for explaining one operation of the poppet damper portion of the bag filter type dust collector of another embodiment according to the present invention.

[Explanation of symbols]

1 poppet damper 2 bag filter 3 Backwash damper 4 Dust collection chamber 5 differential pressure gauge R1 blower side suction flow path R2 backwash channel

Claims (5)

[Claims] 1. A plurality of bug filters 2 are arranged side by side,
Each of the bag filters 2 is provided with a poppet damper 1, and the opening operation of the poppet damper 1 opens the suction passage R1 on the exhaust fan side for the bag filter 2 to perform a dust collecting operation, and the closing operation thereof closes the bag filter. At the same time as blocking the exhaust passage side suction flow path R1 for 2,
One communicates with the outside air, and the other communicates with the exhaust passage R1
The backwash passage R2 communicating with the backwash is opened to perform the backwash operation by the pulse jet, so that the bag filter 2 for the dust collection operation and the bag filter 2 for the backwash operation by the pulse jet are arbitrarily selected. In a bag filter type dust collector configured so as to be possible, a backwash damper 3 having an adjustable opening degree in the backwash flow passage R2.
Bag filter type dust collector equipped with. 2. A differential pressure gauge 5 for detecting a differential pressure between the air exhaust side suction flow path R1 and the dust collection chamber 4 is provided, and the back air exhaust damper side suction flow path R1 is adjusted by adjusting the backwash damper 3. Dust collection chamber 4
The bag filter type dust collector according to claim 1, wherein the differential pressure between the bag filter and the dust filter is adjusted to be -10 mmAq to -20 mmAq. 3. An air exhaust side suction flow path R1 shared by the plurality of bag filters 2 is provided, and the backwash flow path R2 for the plurality of bag filters 2 is shared by one. The bag filter type dust collector according to claim 1 or 2. 4. The bag filter chambers are laterally juxtaposed to each other, and purification air is introduced from the upper part of the dust collection chamber 4, the purification air is taken out in the lateral direction, and then discharged from below. The bag filter type dust collector according to claim 1. 5. The bag filters 2 are arranged side by side in a vertical direction, and are configured so that purification air is introduced from the lower part of the dust collection chamber 4 and the purification air is taken out upward.
A bag filter type dust collector according to claim 3.