JP2000325718A - Bag filter for exhaust gas treatment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In an exhaust gas treatment bag filter, an exhaust gas is made to flow uniformly in a filter cloth housing casing, thereby equalizing the load on each filter cloth and extending the life of the entire filter cloth. Lengthen. SOLUTION: A hopper portion 11 provided at a lower portion of a filter cloth storage casing 10 has a header 31 extending in the front-rear direction along the hopper portion 11 and two hopper portions extending in the longitudinal direction of the header 31.
In the exhaust gas treatment bag filter 1 in which the ends of both branch pipes 32 of the exhaust gas introduction duct 3 composed of two branch pipes 32 extending in the left-right direction toward 11 are connected, the exhaust gas is supplied to each branch pipe 32 in the header 31. A dividing member 6 for dividing the flow evenly is provided, and a cross-shaped rectifying member 7 for rectifying the exhaust gas flowing from the two branch pipes 32 into a uniform upward flow is provided in the hopper portion 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment bag filter for removing harmful substances such as dust, HCl, SO _X , and dioxin contained in exhaust gas discharged from a waste incinerator or the like.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional bag filter for treating exhaust gas. The bag filter (90) includes a plurality of vertical filter cloths (2) stored in a filter cloth storage casing (10), and a hopper section (11) is provided at a lower portion of the casing (10). . Then, a header (31) extending in the front-rear direction along the hopper section (11) and two branch pipes (32) extending in the left-right direction from the two longitudinal directions of the header (31) toward the hopper section (11). The tip of both branch pipes (32) of the exhaust gas introduction duct (3) is connected to the hopper (11). Exhaust gas introduction duct
Exhaust gas flowing into the hopper (11) via (3) rises and passes through the filter cloth (2) above the hopper (11), where harmful substances such as dust, HCl, SO _X , and dioxin are generated. Is removed through the exhaust gas discharge duct (4) connected to the upper end of the filter cloth storage casing (10).

[0003]

In the conventional bag filter for exhaust gas treatment (90), the life of some filter cloths (2) is shorter than that of other filter cloths (2). There was a problem. This is because the exhaust gas does not flow uniformly in the filter cloth housing casing (10), and the dust contained in the exhaust gas
It is thought that the contact is concentrated on

SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas treatment bag filter in which the exhaust gas flows uniformly in the filter cloth housing casing, thereby equalizing the load on each filter cloth and extending the life of the entire filter cloth. To make it longer.

[0005]

According to the present invention, there is provided a bag filter for exhaust gas treatment according to the present invention, comprising: a hopper provided at a lower portion of a filter cloth housing casing; In the exhaust gas introduction duct composed of two branch pipes extending in the left-right direction from the point toward the hopper section, the two branch pipe tips are connected. In the header, there is provided a flow dividing member for equally dividing the exhaust gas into each branch pipe. A rectifying member in the form of a double girder is provided in the hopper to rectify the exhaust gas flowing from both branch pipes into a uniform upward flow.

As described above, if the flow dividing member is provided in the header of the exhaust gas introduction duct and the double-girder rectifying member is provided in the hopper portion of the filter cloth housing casing, the exhaust gas flowing from each branch pipe into the hopper portion by the flow dividing member is provided. Is equalized, and the velocity of the exhaust gas flowing upward in the filter cloth housing casing and passing through each filter cloth is equalized by the rectifying member.

[0007] The rectifying member extends vertically and is provided at a position corresponding to the center of the width of each branch pipe and at a position corresponding to the center between the two branch pipes. It is preferable that the upper portion be composed of a plurality of vertical upper rectifying plates arranged at predetermined intervals in the left-right direction so that the portions bite into the lower rectifying plate.

If the rectifying member is constituted by the upper rectifying plate and the lower rectifying plate as described above, the exhaust gas flowing into the hopper can be rectified into a more uniform upward flow by these rectifying plates.

[0009] It is preferable that the upper straightening plate is gradually elongated downward from the exhaust gas introduction duct side.

By setting the lower edge position of the upper rectifier plate in this way, the flow velocity of the exhaust gas raised along each upper rectifier plate can be made more uniform.

Further, the lower straightening plate provided at a position corresponding to the width center of the branch pipe is provided with an extension portion having a length that divides at least the distal end portion of the branch pipe into two in the width direction. preferable.

If the lower rectifying plate is provided with an extension as described above, the exhaust gas flowing into the hopper from each branch pipe is equally distributed to both sides of the lower rectifying plate.

The extension has a length that divides the inside of the branch pipe into two in the width direction and reaches the center of the width of the header, and the inside of the header of the extension uniformly distributes exhaust gas to two sections of each branch pipe. It is preferable to form a branching section for branching the water into the air.

By providing such a branching section in the extension section, the flow rate of the exhaust gas flowing into the hopper section from each section of the branch pipe can be equalized.

The flow dividing member is not particularly limited as long as it can uniformly divert the exhaust gas flowing into the header to each branch pipe. For example, the height of the branch pipe is 2 times the height of the exhaust gas upstream branch point in the header.
If the base is connected to the lower half of the side wall of the branch at one end, and the base end of one of the branch pipes is connected to the lower half of the side of the branch, the flow dividing member is a horizontal plate disposed at the center of the height of the branch. And an inclined plate portion extending obliquely downward from the exhaust gas downstream end of the horizontal plate portion toward the exhaust gas downstream side, and having a leading end in contact with the inner surface of the lower wall of the header.

[0016]

FIG. 1 to FIG. 5 show an embodiment of the present invention. In this embodiment, the present invention is applied to a case where dust contained in exhaust gas discharged from a sludge incineration plant, HC
This is applied to an exhaust gas treatment bag filter for removing harmful substances such as l, SO _X , and dioxin.

The exhaust gas treatment bag filter (1) shown in these figures has a rectangular cross section that is long in the front-rear direction, and a plurality of vertical filter cloths (2) are accommodated in an intermediate height portion inside the bag filter. Filter cloth storage casing (10) having a hopper (11) at the bottom
And an exhaust gas introduction duct (3) connected to the hopper (11) of the casing (10), and an exhaust gas discharge duct (4) connected to the upper end of the casing (10).

The hopper portion (11) has a truncated inverted pyramid shape having a rectangular cross section that is long in the front-rear direction.

The exhaust gas introduction duct (3) has a header (31) extending in the front-rear direction along the hopper (11), and a header (31) extending from the center and the tip of the header toward the hopper (11). It consists of two branch pipes (32) extending in the left-right direction, and the ends of both branch pipes (32) are connected to the hopper section (11). The header (31) has a cylindrical shape at its base end (311), a rectangular tubular shape with a middle intermediate portion (312) having a square cross section, and a top end (313) at its top wall. It has a tapered square cylindrical shape inclined downward toward the tip. The branch pipe (32) has a rectangular tube shape having a horizontal rectangular cross section. The height of the branch pipe (32) is one half of the height of the exhaust gas upstream branch point in the header (31), that is, the height of the intermediate length part (312), and the side wall of the intermediate length part (312). The base end of one branch pipe (32) is connected to the lower half, and the base end of the other branch pipe (32) is connected to the side wall of the header tip part (313).

Then, the exhaust gas is supplied to each branch pipe in the header (31).
(32) is provided with a flow dividing member (6) for uniformly dividing the flow. The flow dividing member (6) is a branch portion on the exhaust gas upstream side, that is, a horizontal plate portion arranged at the center of the height of the header length intermediate portion (312).
(61), and an inclined plate portion (62) extending diagonally downward from the exhaust gas downstream end of the horizontal plate portion (61) toward the exhaust gas downstream and having a tip in contact with the inner surface of the lower wall of the header (31). Consisting of

In the hopper (11), there is provided a girder-shaped rectifying member (7) for rectifying the exhaust gas flowing from the two branch pipes (32) into a uniform upward flow. The straightening members (7) extend in the left-right direction and are arranged at three positions corresponding to the width center of each branch pipe (32) and at a position corresponding to the center between both branch pipes (32). Plate (71A) (71B) and three vertical upper rectifying plates (72) that extend in the front-rear direction and are arranged at predetermined intervals in the left-right direction so that a part of the plate divides into the lower rectifying plate (71A) (71B). ).

The upper straightening plate (72) is provided with an exhaust gas introduction duct (3).
It gradually becomes longer downward from the side to the back. The upper edge level of the upper current plate (72) is matched. Therefore, the plate width becomes larger as the upper straightening plate (72) is located at the back. Upper current plate (72) and lower current plate (71A)
(71B) means that a vertical slit is formed in at least one of these intersections, and a counterpart plate is inserted into the slit, thereby assembling in a cross-girder shape. In this embodiment, a slit (8) having a required depth is formed at the intersection of the lower current plate (71A) (71B) with the upper current plate (72).

The lower straightening plate (71A) provided at a position corresponding to the center of the width of the branch pipe (32) has a structure in which the inside of the branch pipe (32) is divided into two in the width direction and the width within the header (31). An extension (711) is provided that extends to the center. The inside of the header (31) of these extensions (711) directs the exhaust gas into two sections (32) of each branch (32).
A dividing portion (73) for dividing the flow evenly in 1) is provided.

In the above-mentioned bag filter for exhaust gas treatment (1), the exhaust gas discharged from the sludge incineration facility flows into the hopper section (11) below the filter cloth containing casing (10) through the exhaust gas introduction duct (3). I do. At this time, exhaust gas introduction duct (3)
The exhaust gas that has flowed into the header (31) is uniformly distributed to the two branch pipes (32) by the distribution member (6). The diverted exhaust gas is further extended from the lower straightening plate (71A) on both front and rear sides.
By (711), the water is uniformly divided into the two sections (321) of each branch pipe (32). The exhaust gas flowing into the hopper section (11) from each section (321) of the branch pipe (32) is supplied to the lower current plate (71A) (71
(B) is evenly distributed in the front-rear direction within the hopper portion (11), and is equally distributed in the left-right direction on the upper rectifying plate (72) orthogonal to the lower rectifying plates (71A) and (71B), and is raised. . This allows the filter cloth containing casing
In (10), the speed of the exhaust gas passing upward through each filter cloth (2) is made uniform. Therefore, as in the prior art, some filter cloths (2)
The life of only the filter cloth (2) is not shortened, and the life of the filter cloth (2) as a whole is prolonged.

FIG. 6 shows another embodiment of the present invention. The exhaust gas treatment bag filter (1
(00), the lower straightening plate (710A) provided at a position corresponding to the center of the width of the branch pipe (32) has a length that halves the distal end side portion of the branch pipe (32) in the width direction. An extension (712) is provided. Others are the same as the embodiment shown in FIGS.

[0026]

According to the bag filter for treating exhaust gas of the present invention, the exhaust gas can be uniformly flowed in the filter cloth housing casing by the flow dividing member and the rectifying member. Can be equalized, thereby extending the life of the entire filter cloth.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an exhaust gas treatment bag filter according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view showing a flow dividing member and a flow regulating member.

FIG. 6 is a partial vertical cross-sectional view of a bag filter for exhaust gas treatment showing another embodiment of the present invention.

FIG. 7 is a side view of a conventional bag filter for treating exhaust gas.

[Explanation of symbols]

 (1) Bag filter for exhaust gas treatment (10) Filter cloth containing casing (11) Hopper part (3) Exhaust gas introduction duct (31) Header (32) Branch pipe (321) Partition (6) Dividing member (7)… Rectifying member (71A)… Lower rectifying member (711)… Extension (73)… Diverting portion (71B)… Lower rectifying member (72)… Upper rectifying plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hideaki Oono, Inventor 1-7-89, Minami Kohoku, Suminoe-ku, Osaka-shi Inside Tachibashi Shipbuilding Co., Ltd. Issue Date T-Shipbuilding Co., Ltd. F-term (reference) 4D058 JA04 KB05 QA01 QA13 QA17 SA20 UA13

Claims (5)

[Claims] 1. A header that extends in the front-rear direction along the hopper portion and two branches that extend in the left-right direction from the two longitudinal portions of the header toward the hopper portion. In a bag filter for exhaust gas treatment in which both branch pipe ends of an exhaust gas introduction duct composed of pipes are connected, a flow dividing member that divides exhaust gas evenly to each branch pipe is provided in a header, and both branch pipes are provided in a hopper section. A bag filter for exhaust gas treatment, comprising a cross-girder rectifying member for rectifying exhaust gas flowing from the air into a uniform upward flow. 2. A rectifying member extending in the left-right direction, a vertical lower rectifying plate disposed at a position corresponding to the width center of each branch pipe and at a position corresponding to the center between both branch pipes, and extends in the front-rear direction. 2. The exhaust gas treatment bug according to claim 1, further comprising a plurality of vertical upper rectifying plates arranged at predetermined intervals in the left-right direction so that a part thereof bites into the lower rectifying plate. filter. 3. The bag filter for exhaust gas treatment according to claim 2, wherein the upper straightening plate gradually becomes longer downward from the exhaust gas introduction duct side toward the back. 4. A lower straightening plate provided at a position corresponding to a width center of a branch pipe, wherein an extension portion having a length that divides at least a tip side portion in the branch pipe into two in a width direction is provided. The bag filter for exhaust gas treatment according to claim 2 or 3, characterized in that: 5. The extension has a length that divides the inside of the branch pipe in the width direction into two and reaches the center of the width in the header, and the part of the extension inside the header transfers exhaust gas to two sections of each branch pipe. The bag filter for treating exhaust gas according to claim 4, characterized in that the bag filter is configured to be a branching section for dividing the flow evenly.