CA1046431A - Bag filters - Google Patents
Bag filtersInfo
- Publication number
- CA1046431A CA1046431A CA290,859A CA290859A CA1046431A CA 1046431 A CA1046431 A CA 1046431A CA 290859 A CA290859 A CA 290859A CA 1046431 A CA1046431 A CA 1046431A
- Authority
- CA
- Canada
- Prior art keywords
- bag
- filter
- hook
- end portion
- bags
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
A filter bag comprises an elongate flexible tubular member of filter fabric closed at both ends. A loop formed by one end of the bag defines a hook-receiving end portion, and a sleeve fixed at an intermediate location on the side wall of the bag is adapted to receive a shaker rod for shaking the intermediate portion of the bag.
A filter bag comprises an elongate flexible tubular member of filter fabric closed at both ends. A loop formed by one end of the bag defines a hook-receiving end portion, and a sleeve fixed at an intermediate location on the side wall of the bag is adapted to receive a shaker rod for shaking the intermediate portion of the bag.
Description
1~41~43~
This is a division of our co-pending Canadian Patent Application No. 201,057 filed May 28th 1974.
This invention relates to a filter bag in the form of an elongate tubular member of filter fabric for separation of solid particles on the ingoing side of the filter fabric as the filtered air or gas passes there-through.
In United States patent No. 2,143,664, and United States patent No.
This is a division of our co-pending Canadian Patent Application No. 201,057 filed May 28th 1974.
This invention relates to a filter bag in the form of an elongate tubular member of filter fabric for separation of solid particles on the ingoing side of the filter fabric as the filtered air or gas passes there-through.
In United States patent No. 2,143,664, and United States patent No.
2,8~9,863, description is made of a typical filter device in which this invention may be incorporated, wherein a plurality of elongate tubular members of a filter fabric are suspended from their upper ends on hanger rods while their lower ends are secured to a plate which extends across the interior of the filter compartment.
In this arrangement, corresponding to the~construction illustrated in the aforementioned patents, the upper ends of each of the filter tubes is closed with a loop or strap for suspension onto the hanger rod while the lower end is open for connection to a collar surrounding an opening through the plate. In this arrang~ment, the dirt laden air or other gaseous medium flows from the inlet plenum chamber, through the opening, into the interior of the filter tube for separation of the solids on the interior walls of the tube as the clean gas or air filters therethrough.
As the separated solids build up on the ingoing side of the filter -~
surface, the pressure drop or resistance to gaseous flow through the filter area increases. As a result, in the operation of a filter device of the type described, it is incumbent, at regular intervals, to effect removal of a portion of the built up solids in order to prevent the pressure ~rop or resistance to filter flow from becoming excessive. A high pressure drop results in considerable reduction in gaseous flow through the filter and re~ders the process wholly inefficient. ~ -For this purpose, it is conventional practice to suspend the '' ' ' ." . . . . - .. . . , .. . . ., . . . . , . .:
- ` ~
6~3~
individual filter bags from a tube hook or other means of suspension coupled, usually with several other like members~ to a mechanism which is capable of shaking the tubular member at the upper end, with a back and forth motion, swinging or arcuate motion, or up and down motion, or combinations of such motions, such as illustrated in the aforementioned papents.
In order effectively to remove the collected solids built up as a filter cake on the ingoing side of the fil~er surface, it is desirable to transfer the described shaking motion or force throughout the length of the filter bag. However, where the bag is of considerable length, such as in conventional bags of 30 or more feet in length, with the lower end fixed to a cell plate or nipple, this is difficult to achieve by a shaking action applied only at the upper end. With an elongate bag formed of à flexible fabric, it is possible to achieve a straining effect by pulling but a similar effect cannot be transmitted by pushing.
The desired result can conceivably be achieved, at least in part, by interconnection of the shaking mechanism with spaced portions of the - -individual filter ~ags in addition to the support at the upper end, and it is an object of this invention to provide a filter bag for accomplishing same by slight modification of units currently in operation as well as units of new design.
The invention provides a filter bag comprising an elongate flexible tubular member of filter fabric closed at both ends with the closed end portion ~t one end formed into a hook-receiving end portion and means projecting from at least one portion of the bag spaced from the ends adapted operatively to be engaged by a shaker rod for shaking the engaged inter-mediate portion of the bag.
The objects and advantages of this invention will hereinafter appear and for purposes of illustration, but not of limitation, an embodiment of the invention is shown in the accompanying drawings, in which;
: ~ ., ., . . ,., . ' ~ :, .
~4t;,~L3~
Figure 1 is a side elevational n ew of a portion of the bag filter device which shows the filter bags embodying the features of this invention; and Figure 2 is a top plan view of the device shown in the Figure 1.
With reference to the drawings, illustration is made of one form of bag support and an associated portion of the shaker mechanism. The filter bags 20 are in the form of elongate tubular members formed of a filter fabric and closed at both ends. Ordinarily a number of bags make up a single filter section within a filter compartment, although only four such filter bags are shown in Figures 1 and 2 of the drawings.
The filter bags 20 are closed at their upper ends and means are provided for supporting the bags, at their upper ends, from two hooks 22, connected to form a part of the shaker mechanism. In the illustrated modification, the two hooks 22 are secured at their upper ends to diametric-ally opposed sides of a shaker tube 24 which extends horizontally through the length of the filter tube section~and is mounted for reciprocal rota~ional movement about its horizontal axis through an angle which may be in the range of 5-30.
The two hooks 22 are formed with elongate hanger rods 26, which are threaded at their upper ends for attachment, as by means of nut members 28, on opposite sides of ears or flanges 30 extending laterally from the opposite sides of the shaker tube 24, to enable vertical adjustment of the hanger rods relative to their attachment to the shaker tube.
The lower end portion of each of the hanger rods 26 is formed with a hook member 32 that extends horizontally through a loop 34 on the closed end of the filter bag, removably to support the bag from the tube hook.
The described arrangement represents current conventional construc-tion. With rods having an effective length of 5 inches from the axis of the shaker tube to the hook 32 on the end of the hanger rod, reciprocal ~04~i~3~
rotational movement of the shaker tube about its axis through an angle of about 20 will cause the end of the tube hook to rock back and forth through an arc of about 7/8 inch. This will cause the filter tube to whip back and -forth with a concurrent slight up and down or pull and pushn~mobion on the filter bag.
In the arragement shown in Figures 1 and 2, the tube hook is pro-vided with an extension 36, in the form of an elongate rod 38~ having a length 40 at the upper end rigidly secured, as by welding, to an intermediate vert-ically extending portion of the hanger rod Z6. The extension rod, hereinafter referred to as a boot strap rod~ is provided with an offset portion 42~ adja~
cent its upper e~d~. to clear the filter bag and then extends downwardly ;
beyond the upper e~d~ of the filter bag for a distance to engage the filter bag at one or more points remote from its upper end. In the illustrated modification~ the boot strap rod extends alongside the filter bag for an additional 15 inches and is attached to the adjacent portion of the bag by means of a stirrup 44 or sleeve, which either encases the bag or is attached thereto~ as along the bag seam 46. It will be understood that the boot strap rod can continue to extend for an additional distance alongside the filter bag, up to almost the full length thereof, with periodic attachment to connect the filter bag with the adjacent portion of the boot strap rod.
In the illustrated modification, wherein connection between the filter ~ag and the boot strap rod occurs some 15 inches below the upper end of the bag, the to ancl fro motion at the point of connection will be about 2-3/4 inches compared to the 7/8 inch movement of the hook member from which the upper end of the bag is suspen~ed. This is a magnification of more than three-fold in the excursion of the bag at this point~ thereby to achieve more substantial movement of the bag, at a higher rate, with corresponding increase in cleaning force fo~ more effective removal of filter cake or collected sol-ids. ThusJshaking frequency, from top to bottom of the bag, is more than :
, i_ 104~3~L
doubled without any change in shaker speed.
In order to minimize wearing abrasion responsive to engagement between the edges of adjacent filter bags~ when filter flow is cut off, and the bags are collapsed during shaking to clean the bags, the hoo~s 32, from which the upper ends of the bags are suspended, are offset at an angle of 40~5 ~preferably about 45) from the crosswise and lengthwise aligned centers of the bags. As a result, flattening in the collapsed co~tion will occur along the diagonal where the distance between centers corresponds to the hypotenuse of about 8-~ inches along a right angle triangle having 6 inch sides, corresponding to 5 inch bags arranged on 6 inch centers, so that the bags will not touch each other in their flattened condition, as illustra-ted in Figure 2.
The described combination provides a considerable reduction in pressure drop o`r resistance to air flow. For example, in the construc*ion described as representative of the pracitice of this invention, a reduction ~
in pressure drop with no change in throughput of 22-42% is achieved, depending ~ ~ -somewhat upon the type of strap or cap at the top, or a 35-~5% increase in throughput at constant ~oading with the original pressure drop. In practical ;
terms, this means that the capacity rate for a conventional fabric filter can be increased considerably with but slight modification of the shaker mechanism and bag support or that pressure drop can be reduced while the aapacity re-mains the same.
,:
In this arrangement, corresponding to the~construction illustrated in the aforementioned patents, the upper ends of each of the filter tubes is closed with a loop or strap for suspension onto the hanger rod while the lower end is open for connection to a collar surrounding an opening through the plate. In this arrang~ment, the dirt laden air or other gaseous medium flows from the inlet plenum chamber, through the opening, into the interior of the filter tube for separation of the solids on the interior walls of the tube as the clean gas or air filters therethrough.
As the separated solids build up on the ingoing side of the filter -~
surface, the pressure drop or resistance to gaseous flow through the filter area increases. As a result, in the operation of a filter device of the type described, it is incumbent, at regular intervals, to effect removal of a portion of the built up solids in order to prevent the pressure ~rop or resistance to filter flow from becoming excessive. A high pressure drop results in considerable reduction in gaseous flow through the filter and re~ders the process wholly inefficient. ~ -For this purpose, it is conventional practice to suspend the '' ' ' ." . . . . - .. . . , .. . . ., . . . . , . .:
- ` ~
6~3~
individual filter bags from a tube hook or other means of suspension coupled, usually with several other like members~ to a mechanism which is capable of shaking the tubular member at the upper end, with a back and forth motion, swinging or arcuate motion, or up and down motion, or combinations of such motions, such as illustrated in the aforementioned papents.
In order effectively to remove the collected solids built up as a filter cake on the ingoing side of the fil~er surface, it is desirable to transfer the described shaking motion or force throughout the length of the filter bag. However, where the bag is of considerable length, such as in conventional bags of 30 or more feet in length, with the lower end fixed to a cell plate or nipple, this is difficult to achieve by a shaking action applied only at the upper end. With an elongate bag formed of à flexible fabric, it is possible to achieve a straining effect by pulling but a similar effect cannot be transmitted by pushing.
The desired result can conceivably be achieved, at least in part, by interconnection of the shaking mechanism with spaced portions of the - -individual filter ~ags in addition to the support at the upper end, and it is an object of this invention to provide a filter bag for accomplishing same by slight modification of units currently in operation as well as units of new design.
The invention provides a filter bag comprising an elongate flexible tubular member of filter fabric closed at both ends with the closed end portion ~t one end formed into a hook-receiving end portion and means projecting from at least one portion of the bag spaced from the ends adapted operatively to be engaged by a shaker rod for shaking the engaged inter-mediate portion of the bag.
The objects and advantages of this invention will hereinafter appear and for purposes of illustration, but not of limitation, an embodiment of the invention is shown in the accompanying drawings, in which;
: ~ ., ., . . ,., . ' ~ :, .
~4t;,~L3~
Figure 1 is a side elevational n ew of a portion of the bag filter device which shows the filter bags embodying the features of this invention; and Figure 2 is a top plan view of the device shown in the Figure 1.
With reference to the drawings, illustration is made of one form of bag support and an associated portion of the shaker mechanism. The filter bags 20 are in the form of elongate tubular members formed of a filter fabric and closed at both ends. Ordinarily a number of bags make up a single filter section within a filter compartment, although only four such filter bags are shown in Figures 1 and 2 of the drawings.
The filter bags 20 are closed at their upper ends and means are provided for supporting the bags, at their upper ends, from two hooks 22, connected to form a part of the shaker mechanism. In the illustrated modification, the two hooks 22 are secured at their upper ends to diametric-ally opposed sides of a shaker tube 24 which extends horizontally through the length of the filter tube section~and is mounted for reciprocal rota~ional movement about its horizontal axis through an angle which may be in the range of 5-30.
The two hooks 22 are formed with elongate hanger rods 26, which are threaded at their upper ends for attachment, as by means of nut members 28, on opposite sides of ears or flanges 30 extending laterally from the opposite sides of the shaker tube 24, to enable vertical adjustment of the hanger rods relative to their attachment to the shaker tube.
The lower end portion of each of the hanger rods 26 is formed with a hook member 32 that extends horizontally through a loop 34 on the closed end of the filter bag, removably to support the bag from the tube hook.
The described arrangement represents current conventional construc-tion. With rods having an effective length of 5 inches from the axis of the shaker tube to the hook 32 on the end of the hanger rod, reciprocal ~04~i~3~
rotational movement of the shaker tube about its axis through an angle of about 20 will cause the end of the tube hook to rock back and forth through an arc of about 7/8 inch. This will cause the filter tube to whip back and -forth with a concurrent slight up and down or pull and pushn~mobion on the filter bag.
In the arragement shown in Figures 1 and 2, the tube hook is pro-vided with an extension 36, in the form of an elongate rod 38~ having a length 40 at the upper end rigidly secured, as by welding, to an intermediate vert-ically extending portion of the hanger rod Z6. The extension rod, hereinafter referred to as a boot strap rod~ is provided with an offset portion 42~ adja~
cent its upper e~d~. to clear the filter bag and then extends downwardly ;
beyond the upper e~d~ of the filter bag for a distance to engage the filter bag at one or more points remote from its upper end. In the illustrated modification~ the boot strap rod extends alongside the filter bag for an additional 15 inches and is attached to the adjacent portion of the bag by means of a stirrup 44 or sleeve, which either encases the bag or is attached thereto~ as along the bag seam 46. It will be understood that the boot strap rod can continue to extend for an additional distance alongside the filter bag, up to almost the full length thereof, with periodic attachment to connect the filter bag with the adjacent portion of the boot strap rod.
In the illustrated modification, wherein connection between the filter ~ag and the boot strap rod occurs some 15 inches below the upper end of the bag, the to ancl fro motion at the point of connection will be about 2-3/4 inches compared to the 7/8 inch movement of the hook member from which the upper end of the bag is suspen~ed. This is a magnification of more than three-fold in the excursion of the bag at this point~ thereby to achieve more substantial movement of the bag, at a higher rate, with corresponding increase in cleaning force fo~ more effective removal of filter cake or collected sol-ids. ThusJshaking frequency, from top to bottom of the bag, is more than :
, i_ 104~3~L
doubled without any change in shaker speed.
In order to minimize wearing abrasion responsive to engagement between the edges of adjacent filter bags~ when filter flow is cut off, and the bags are collapsed during shaking to clean the bags, the hoo~s 32, from which the upper ends of the bags are suspended, are offset at an angle of 40~5 ~preferably about 45) from the crosswise and lengthwise aligned centers of the bags. As a result, flattening in the collapsed co~tion will occur along the diagonal where the distance between centers corresponds to the hypotenuse of about 8-~ inches along a right angle triangle having 6 inch sides, corresponding to 5 inch bags arranged on 6 inch centers, so that the bags will not touch each other in their flattened condition, as illustra-ted in Figure 2.
The described combination provides a considerable reduction in pressure drop o`r resistance to air flow. For example, in the construc*ion described as representative of the pracitice of this invention, a reduction ~
in pressure drop with no change in throughput of 22-42% is achieved, depending ~ ~ -somewhat upon the type of strap or cap at the top, or a 35-~5% increase in throughput at constant ~oading with the original pressure drop. In practical ;
terms, this means that the capacity rate for a conventional fabric filter can be increased considerably with but slight modification of the shaker mechanism and bag support or that pressure drop can be reduced while the aapacity re-mains the same.
,:
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A filter bag comprising an elongate flexible tubular member of filter fabric closed at both ends with the closed end portion at one end formed into a hook-receiving end portion and means projecting from at least one portion of the bag spaced from the ends adapted operatively to be engag-ed by a shaker rod for shaking the engaged intermediate portion of the bag.
2. A filter bag as claimed in claim 1 in which the hook-receiving end portion comprises a loop formed by the end portion of the bag adapted to receive the hook.
3. A filter bag as claimed in claim 1 in which the means operatively to be engaged by the hook comprises a sleeve fixed onto the side wall of the bag spaced from its ends.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US364375A US3877901A (en) | 1973-05-29 | 1973-05-29 | Bag filters |
| CA201,057A CA1030081A (en) | 1973-05-29 | 1974-05-28 | Bag filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1046431A true CA1046431A (en) | 1979-01-16 |
Family
ID=25667591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA290,859A Expired CA1046431A (en) | 1973-05-29 | 1977-11-15 | Bag filters |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1046431A (en) |
-
1977
- 1977-11-15 CA CA290,859A patent/CA1046431A/en not_active Expired
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