JP2002282636A - Bag filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag filter reducing equipment cost than before while keeping conventional dust removal capacity or enhancing the same. SOLUTION: Exhaust gas is introduced into a dust removing chamber 3 through a gas inlet 7 and dust in the exhaust gas is removed by a large number of cylindrical filter cloths 2 horizontally arranged in the dust removing chamber 3 in a parallel in longitudinal and lateral directions and the gas, from which dust is removed, is discharged from a gas outlet 9 through both open ends of the filter cloths 2, the through-holes 3b formed on the side walls 3a and 3a constituting the dust removing chamber 3 and connected to both open ends of the filter cloths 2 and the gas passage 8 connected to the through-holes 3b and, by parallelly arranging a large number of the filter cloths 2 in an up and down direction, the installation area of the bag filter 1 is reduced than before while keeping the conventional dust removing areas of the filter cloths 2 or increasing the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filter for removing exhaust gas.

[0002]

2. Description of the Related Art A bag filter shown in FIGS. 4 and 5 is known as a bag filter for removing exhaust gas with a filter cloth. FIG. 4 is a front sectional view showing a bag filter according to the related art, and FIG. 5 is a plan view of the bag filter of FIG. As shown in FIG. 4, this bag filter 50 is a so-called outer surface filtration type bag filter, and has a lower inlet side region 52 connected to a gas inlet 51 and an upper outlet side region 54 connected to a gas outlet 53. Are separated by a partition plate 55, and a large number of through-holes 56 are formed in the partition plate 55, as shown in FIGS.
As shown in FIG. 4, a bag-shaped filter cloth 57 is connected, and when exhaust gas introduced into the inlet side area 52 through the gas inlet 51 passes through the filter cloth 57, the filter cloth 57 To collect the dust in the exhaust gas, and discharge the removed gas to the subsequent stage through the through hole 56, the outlet side region 54, and the gas outlet 53.

The bag filter 50 has a pulse jet nozzle 58 installed opposite to the open end of each bag-shaped filter cloth 57, and sequentially opens valves 59 connected to the pulse jet nozzles 58. The filter cloth 57 is backwashed by instantaneously sequentially applying a jet stream of high-pressure air from the pulse jet nozzle 58, and dust adhering to the filter cloth 57 is periodically removed.

[0004]

Here, in the above-described bag filter 50, it is desired to reduce the equipment cost by reducing the installation area of the bag filter 50 itself.

When the amount of gas increases in the bag filter 50, the dust removal area of the filter cloth 57 must be increased. The jet airflow from the nozzle 58 is applied to the filter cloth 5.
7, it is necessary to increase the number of the filter cloths 57 to increase the dust removal area. Therefore, while increasing the installation area of the bag filter 50,
Along with this, it is necessary to increase the number of dust storing / discharging hoppers 60 installed below the bag filter 50, and equipment costs increase.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to provide a bag filter capable of reducing the equipment cost as compared with the conventional one while maintaining or improving the dust removing performance. With the goal.

[0007]

The bag filter according to the present invention has a dust removal chamber connected to a gas inlet for introducing exhaust gas, and has a cylindrical shape with both ends being open ends. A plurality of filter cloths which are arranged side by side in the vertical and horizontal directions and connect the opposing side walls of the dust removal chamber; a plurality of through holes formed in each of the side walls connected to the filter cloth and connected to the open end of the filter cloth; And a gas passage communicating with the gas outlet for discharging gas.

[0008] According to such a bag filter, the exhaust gas introduced into the dust removal chamber through the gas inlet is removed by the cylindrical filter cloth which is horizontally arranged in the dust removal chamber and arranged in a plurality of rows and columns. The dust-removed gas passes through both open ends of the filter cloth, through holes formed on the side walls constituting the dust removing chamber and connected to both open ends of the filter cloth, and a gas outlet through a gas passage connected to the through holes. Is discharged from Therefore, by arranging a large number of filter cloths in the vertical direction, the installation area of the bag filter is reduced as compared with the conventional one, while the dust removal area of the filter cloth is the same as or larger than the conventional one.

[0009] Here, if the filter cloth backwashing device corresponding to both open ends of the filter cloth is provided, the cylindrical filter cloth is effectively backwashed to all corners, and the filter cloth is lengthened. It is possible to increase the dust removal area.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a bag filter according to the present invention will be described below with reference to the accompanying drawings. 1 is a front sectional view showing a bag filter according to the present invention, FIG. 2 is a plan view of the bag filter of FIG. 1, and FIG.
It is a perspective view which extracts and shows the dust removal chamber and the dust storage / discharge hopper in FIG.

As shown in FIGS. 1 and 3, the bag filter 1 is formed in a box shape, has a lower end open, and has a plurality of filter cloths 2 disposed therein. Room 3
A dust storage / discharge hopper 4 communicating with the lower open end and storing and discharging dust mainly washed off from the filter cloth 2;
As shown in FIG. 1 and FIG. 2, one side of the dust removal chamber 3 (the side facing the extending direction of the filter cloth 2; the left and right sides in the drawing).
And an outer wall 5 surrounding the upper portion at a predetermined interval.

As shown in FIGS. 1 and 3, the dust storage / discharge hopper 4 has a substantially quadrangular pyramid shape arranged upside down, and has a gas inlet for introducing exhaust gas from upstream into the upper part. 7 and, as shown in FIG.
A discharge valve 6 for discharging the stored dust to the outside is provided.

The filter cloth 2 provided in the dust removing chamber 3 is shown in FIG.
As shown in FIG. 3, both ends are formed in a cylindrical shape having open ends, and are arranged in the dust-removing chamber 3 in a horizontal direction so as to face one direction, and a plurality of juxtaposed vertically and horizontally are opposed to the dust-removing chamber 3. The side walls 3a (with the filter cloth 2 sandwiched therebetween) are connected to each other.
Each of the side walls 3a, 3a connected to the filter cloth 2 has a filter cloth 2
Is formed with a through hole 3b connected to the open end.

As shown in FIGS. 1 and 2, the outer wall 5 surrounds one side (the side facing the extending direction of the filter cloth 2) and the upper side of the dust removing chamber 3 at a predetermined interval. Thus, a gas passage (flue) 8 is defined between the dust chamber 3 and the dust chamber 3. The outer wall 5 has a gas outlet 9 at the center of the upper end for discharging gas flowing through the gas passage 8 to the outside.

Further, as shown in FIG. 1, the bag filter 1 includes a filter cloth backwashing device 10 corresponding to both open ends of each of the filter cloths 2. The filter cloth backwashing apparatus 10 is provided with a pulse jet nozzle 12 installed opposite to the open end of each filter cloth 2, and installed corresponding to each of the pulse jet nozzles 12, and is provided via a line 13. A valve 11 for adjusting the amount of high-pressure air to be supplied.

According to the bag filter 1 having such a configuration, the exhaust gas introduced from the upstream is introduced into the dust removal chamber 3 via the gas inlet 7 and the dust storage / discharge hopper 4.
When passing through the filter cloths 2 arranged side by side vertically and horizontally in the horizontal direction of the dust removal chamber 3, dust in the exhaust gas is collected by the filter cloths 2, and the removed gas is filtered. The cloth 2 is discharged from the gas outlet 9 through both open ends, the through holes 3b of the side walls 3a, 3a, and the gas passage 8, and is provided to the subsequent stage. Therefore, in the bag filter 1, the exhaust gas is satisfactorily removed.

Here, in this bag filter 1,
By arranging a large number of filter cloths 2 in the vertical direction, the dust removal area of the filter cloths 2 is made the same as the conventional one, while the width W of the bag filter 1 is reduced as shown in FIG. The width of the bag filter 1 is made the same as the width W (see FIG. 5).
Is shorter than the length L2 of the conventional bag filter (see FIG. 5). Specifically, while the length L2 of the conventional bag filter 50 is 15 m, in the present embodiment, the length L1 of the bag filter 1 is reduced to 6 m.

As described above, the bag filter 1 of the present embodiment
In this case, the installation area of the bag filter 1 is reduced as compared with the conventional case, and accordingly, the number of dust storage / discharge hoppers 4 (one in FIG. 1) is reduced to the conventional dust storage / discharge hopper 60 ( (See FIG. 4; two in FIG. 4). For this reason, the equipment cost is reduced as compared with the related art while having the same dust removing performance as the related art.

Here, if the number of filter cloths 2 arranged in the vertical direction is further increased, it is possible to increase the dust removal area of the filter cloths 2 and reduce the installation area of the bag filter 1 as compared with the conventional case. As a result, it is possible to reduce the equipment cost as compared with the related art while improving the dust removal performance. Therefore, it is possible to cope with the case where the gas amount increases.

Further, by further extending the length of the filter cloth 2, the dust removal area of the filter cloth 2 can be increased, and the dust removal performance can be further improved.

In such a bag filter 1, dust adheres and accumulates on the filter cloth 2 as it is used. Therefore, the filter cloth backwashing device 10 is used to open and close the valve 11 sequentially from top to bottom. Then, the filter cloth 2 is backwashed by instantaneously applying a jet stream of high-pressure air from the pulse jet nozzle 12 from both open ends of the filter cloth 2.

In the backwashing carried out from both sides of the filter cloth 2 (conventionally only from one side), the jet stream spreads over the entirety of the filter cloth 2 and is effectively backwashed to every corner, so that the dust is satisfactorily removed. Dropped. In addition, since the filter cloth 2 is backwashed from both sides as described above, even when the length of the filter cloth 2 is extended to increase the dust removal area of the filter cloth 2 as described above, the jet airflow spreads over the entirety. The filter cloth 2 is effectively backwashed to every corner.

The dust that has been washed off by the backwashing and the dust that naturally settles out of the exhaust gas is stored in a dust storage / discharge hopper 4 and discharged to the outside via a discharge valve 6 as appropriate.

Although the present invention has been specifically described based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the installation area of the bag filter 1 is minimized. In order to reduce the number of the filter cloths, a plurality of filter cloths 2 are horizontally arranged in the dust removal chamber 3 so as to face one direction, and a plurality of filter cloths 2 may be horizontally arranged so as to intersect vertically. In this case, since it is necessary to provide gas passages corresponding to the other two sides of the dust removal chamber 3, the installation area of the bag filter 1 is slightly larger than that of the above embodiment.

In the above embodiment, the filter cloth backwashing apparatus is of a pulse jet type, but is not limited to this.

[0026]

According to the bag filter of the present invention, the exhaust gas introduced into the dust removal chamber through the gas inlet is removed by a plurality of tubular filter cloths arranged horizontally and vertically in the dust removal chamber.
This dust-removed gas is passed through both open ends of the filter cloth, through-holes formed on the side walls constituting the dust removal chamber and connected to both open ends of the filter cloth,
By discharging the gas from the gas outlet through the gas passage connected to the through hole and arranging a large number of the filter cloths in the vertical direction, the dust removal area of the filter cloths is the same or increased as before, and the bag filter is installed. Since the configuration is such that the area is reduced as compared with the related art, it is possible to reduce the equipment cost as compared with the related art while maintaining or improving the dust removing performance as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a bag filter according to the present invention.

FIG. 2 is a plan view of the bag filter of FIG. 1;

FIG. 3 is a perspective view illustrating a dust removal chamber and a dust storage / discharge hopper in FIG. 1 in an extracted manner.

FIG. 4 is a front sectional view showing a bag filter according to the related art.

FIG. 5 is a plan view of the bag filter of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag filter, 2 ... Filter cloth, 3 ... Dust removal chamber, 3a ... Side wall of dust removal chamber, 3b ... Through hole, 7 ... Gas inlet, 8 ... Gas passage,
9 gas outlet, 10 filter cloth backwashing device, 11 valve, 1
2 ... Pulse jet nozzle.

Claims (2)

[Claims] 1. A dust removing chamber connected to a gas inlet for introducing exhaust gas, and both ends are open ends, and are formed in a cylindrical shape. A filter cloth connecting the opposing side walls, a plurality of through holes formed in each of the side walls connected to the filter cloth, and connected to an open end of the filter cloth, and a gas outlet for discharging these through holes and gas. And a gas passage communicating with the bag filter. 2. The bag filter according to claim 1, further comprising a filter cloth backwashing device corresponding to both open ends of the filter cloth.