JPH02222708A - Bag filter dust collection method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bag filter dust collection method and an apparatus thereof, and particularly relates to a bag filter dust collection method and apparatus for separating and collecting dust in gas using a bag filter. .

[Conventional technology]

Conventionally, this type of collector is used to collect dust in the process gas generated during furnace operations. In the dust collection step, first, high-temperature gas containing dust discharged from the furnace body is collected using a local smoke collection hood. Next, the collected gas is cooled to a certain temperature by a cooler.

Next, the gas is supplied to a dust collector and separated into clean air and dust. Dust is collected by adhering to a bag filter installed in the dust collector, and clean air is released into the atmosphere by a fan.

As shown in FIG. 4, the dust collector lid main body 10 equipped with the bag filter is constructed by connecting a pair of dust collectors 12 and 14. Inside the dust collectors 12.14, bag-shaped bag filters 16.18 that can be expanded and contracted are suspended from the ceiling, and an opening IE is provided in the lower part of the bag filters 16.18.
ia, 18a are formed. Furthermore, the opening 16a
, 18a are provided with partition plates 17 and 19, respectively.

The outer peripheral surface of the partition plate 17.19 is attached to the inner wall of the dust collector 12.14, and defines a dust collection chamber 128% 14a and air supply chambers 12b and 14b, respectively.

Further, an air exhaust damper 20.22 and an air backwash damper 24.26 are connected to the upper part of the dust collector 12.14, respectively. The air exhaust damper 20.22 communicates with a fan 34 via a pipe 32, and the air exhausted by the fan 34 is exhausted through a duct 36 and communicates with the air backwash damper 24.26 via a pipe 40. be done.

On the other hand, the lower part of the dust collection bag W112.14 is formed into a hopper shape, and a gas inlet 42.44 is provided in the middle part thereof. The gas inlets 42, 44 are communicated with a tara (not shown) via a branch pipe. Furthermore, dust exhaust devices 48 and 50 are installed below the gas inlets 42 and 44, respectively.

The gas flows from the gas inlet 42.44 to the dust collector 112.1.
4 and are separated into clean air and dust by bag filters 16 and 18.

Dust is collected by adhering to baghouses 16, 18, and clean air is emitted by fan 34.

By the way, in order to clean the dust adhering to the bag filter 18, the air exhaust damper 22 is closed, the air backwash damper 26 is opened, and air is blown into the dust collection chamber 14a to perform a backwash operation. As a result, the bag filter 18 contracts, and the dust attached to the inside of the bag filter I8 is peeled off and falls toward the dust discharge device 50, and is discharged to the outside of the dust collector 110 by the dust discharge device [150]. Ru. At this time, the dust collector 12 opens the air exhaust damper and closes the air backwash damper 24 to perform normal operation.

Normal operation and backwash operation of the dust collection bags [12, 14 are normally performed alternately, with one dust collection device operating normally and the other performing backwash operation.

[Problem that the invention aims to solve]

However, the conventional dust cleaning method for a bag filter dust collector has a drawback in that dust remains attached to the bag filter even after the backwashing operation of the dust collector is completed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bag filter dust collection method and an apparatus therefor that improve the peeling effect of dust attached to bag filters.

[Means for solving problems]

In order to achieve the above object, the present invention provides a method for collecting dust in a process gas by alternately using at least two or more bag filters, when one of the bag filters is in a normal operating state. , the other is characterized by pulsating the bag filter during backwash operation.

[Effect]

According to the present invention, first, the air exhaust damper (20) is closed and the air backwash damper (24) is opened to supply air into the dust collector (12) and contract the bag filter (16). Next, the air backwash damper (24) is closed and the intermittent air damper (28) is opened to complete the collection! The air in the device (12) is exhausted and the bag filter (16) is expanded. Further, the air supply and discharge operations of the air backwash damper (24) and the air intermittent damper (28) are alternately repeated multiple times. As a result, the bag filter (16) becomes pulsating, and the dust adhering to the bag filter (16) is peeled off by the pulsation of the bag filter (16), thereby improving the dust removal effect.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the bag filler dust collection method and device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment showing a side sectional view of a bag filter dust collector according to the present invention.

The same or similar members in the conventional example shown in FIG. 4 will be described with the same reference numerals.

In FIG. 1, the bag filter dust collector main body 10 is constructed by connecting a pair of dust collecting bags [12, 14].

Inside the dust collectors 12.14, bag-shaped bag filters 16.18 that can be expanded and contracted are suspended from the ceiling, and openings 16a and 18a are provided at the bottom of the bag filters 16.18.
is formed.

Furthermore, partition plates 17 and 19 are provided near the opening portions 16as18a, respectively. The partition plate 17.19 is attached toward the inner wall of the dust collector 12.14 to separate the dust collection chamber 12.
a% 14a and air supply chambers 12b and 14b are defined, respectively. Further, an air exhaust damper 20.22, an air backwash damper 24.26, and an intermittent air damper 28.30 are connected to the upper part of the dust collector 12.14, respectively. The air exhaust damper 20.22 is connected to the fan 3 via a pipe 32.
Further, the fan 34 is connected to the exhaust staff 38 through a duct 36 and to the air backwash damper 24, 26 through a pipe 40.

On the other hand, the lower part of the dust collector 12.14 is formed into a hopper shape, and a gas inlet 42.44 is provided in the middle of the hopper. The gas inlets 42, 44 communicate with a cooler (not shown) via a branch pipe 46. Furthermore, a dust exhaust device [248, 50] is stacked under the gas inlet 42, 44. Further, the intermittent air damper 28 , 30 is communicated with the branch pipe 46 via a pipe 52 .

Next, a bag filter dust collecting method configured as described above will be explained.

The gas cooled to a certain temperature by the cooler is blown out from the gas inlet 42.44 of the branch pipe 46 into the air supply chambers 12b and 14b of the dust collector 12.14, respectively, and converted into clean air and dust by the bag filter 16.18. To separate. The dust is collected by adhering to the bag filter 16.18, and the clean air is exhausted by opening the air exhaust damper 20.22 and sent to the fan 34.
released into the atmosphere by

Further, FIG. 3 shows operation patterns of the dust collectors 12 and 14, including a normal operation for collecting dust and a backwash operation for cleaning dust. According to this, dust collector 1
In the backwash operation No. 2, first, the air exhaust damper 20 is closed, and the air backwash damper 24 is opened for a certain period of time to supply air into the dust collection chamber 12a and contract the bag filter 16. Next, the air backwash damper 24 is closed and the intermittent air damper 28 is opened for a certain period of time to exhaust air from the dust collection chamber 12a and expand the bag filter 16. Furthermore,
The air supply and discharge operations of the air backwash damper 24 and the intermittent air damper 28 are alternately repeated a plurality of times. This causes the bag filter 16 to pulsate,
The dust adhering to the bag filter 16 can be removed more effectively by this pulsation. Therefore, when performing the above-mentioned backwash operation, when compared with the conventional backwash operation,
A large amount of dust can be removed. On the other hand, during the backwashing operation of the dust collection bag [12, the fan 34 is constantly operated;
Further, the dust collector 14 opens the air exhaust damper 22 and closes the air backwash damper 26 and the intermittent air damper 30 to perform normal operation.

Next, as shown in FIG. 3, the backwashing operation of the dust collector 14 is performed by first closing the air exhaust damper 22 and opening the air backwashing damper 26 to supply air to the dust collection chamber 14a and the bag filter 18. is contracted as shown in FIG. Next, the air backwash damper 26 is closed, and the intermittent air damper 30 is opened to exhaust air from the dust collection chamber 14a, and the bag filter 18 is expanded as shown by two points I1m in FIG. Further, the air supply/discharge operations of the air backwash damper 26 and the intermittent air damper 30 are alternately repeated a plurality of times. This causes the bag filter 18 to pulsate, so that dust adhering to the bag filter 18 can be efficiently peeled off.

Incidentally, the dust separated during the backwashing operation of the dust collectors 12, 14 falls from the respective bag filters 16, 18, and is discharged to the outside of the dust collector main body 10 by the dust discharge devices 48, 50. Moreover, the air exhausted by opening the air exhaust damper 20.22 is sent to the fan 34 through the pipe 32 and exhausted from the exhaust staff.

In addition, air intermittent 4. The air exhausted by opening the dampers 28, 30 is sent into the branch pipe 46 again via the vibrator 52.

〔Effect of the invention〕

As explained above, according to the bag filter dust collection method and device according to the present invention, the air supply and discharge of the air backwash damper and the intermittent air damper are operated alternately multiple times during the backwash operation of the -/ve filter. Since the bag filter is made to pulsate, the dust removal effect of the bag filter can be improved.

FIG. 2 is an explanatory diagram showing an operation pattern of a bag filter dust collector according to the present invention; FIG. 3 is a cross-sectional diagram showing an example of a conventional bag filter dust collector. .

10... Bag filter dust collector, 12.14...
Dust collector, 16.18... Bag filter, 2
0.22...Air exhaust damper, 24.26...
Air backwash damper, 28.30...Air intermittent damper, 34...Fan, 38...Exhaust staff,
48.50...Dust discharge device.

Applicant: Hitachi Plant Construction Co., Ltd.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a bag filter dust collector according to the present invention. figure 1st floor

Claims (2)

[Claims] (1) In a method of collecting dust in the process gas by alternately using at least two or more bag filters, when one bag filter is in normal operation, the other is in backwash operation. A bag filter dust collection method characterized by pulsating the filter. (2) A dust collector main body, a dust discharge section provided at the bottom of the dust collector main body, a gas supply section that supplies gas into the dust collector main body, and a dust collector main body installed inside the dust collector main body and the lower part A bag-shaped bag filter that opens to exhaust gas and separate and collect dust in the gas, an air exhaust device that exhausts clean air inside the dust collector body that has passed through the bag filter, and a bag filter inside the dust collector body. In a bag filter dust collector, which is composed of an air backwashing device that supplies air to backwash the bag filter, and A bag filter dust collector characterized by being equipped with an intermittent air supply device that pulsates the filter.