CA1201389A - Oily water separator - Google Patents
Oily water separatorInfo
- Publication number
- CA1201389A CA1201389A CA000420703A CA420703A CA1201389A CA 1201389 A CA1201389 A CA 1201389A CA 000420703 A CA000420703 A CA 000420703A CA 420703 A CA420703 A CA 420703A CA 1201389 A CA1201389 A CA 1201389A
- Authority
- CA
- Canada
- Prior art keywords
- spacing
- plates
- location
- stack
- received
- 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
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Abstract
ABSTRACT:
An oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins depending from superposed plates at crests in the corrugations thereof and received in said first spacing in respective first location means located on an under-posed plate and received in said second spacing in respective second location means provided on said under-posed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of underposed plates at the crests thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
An oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins depending from superposed plates at crests in the corrugations thereof and received in said first spacing in respective first location means located on an under-posed plate and received in said second spacing in respective second location means provided on said under-posed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of underposed plates at the crests thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
Description
~æ~
OIL~ WATER SEPARATOR
Field of the Invention This invention relates to an oily water separator of the plate type and in particular to coalescer plates for use therein.
Bacl~ground of the Invention Examples of conventional oily water separators of the plate type are described in United States Patents 3847813 and 3957656. It will be seen that the basis of the separation resides in the provision of a plurality of corrugated separator plates mounted parallel to one another. The plates are sinusoidal or approximately so in cross section. The oil/water mixture is caused to flow between the parallel plates twhich may be arranged in a parallel horizontal fashion as in U.S Patent 3957656 or in a somewhat inclined fashion as in U.S Patent 38~7813), the effect of the sinusoidal path being alternatively to accelerate and to decelerate the fluid. These changes in velocity of the fluid which occur in directions both tangential to and normal to plate surfaces, combined with the inertial effects of differently sized oil droplets, tend to cause the droplets to coalesce. The coalesced oil droplets are suitably led off through weep holes in the crests of the corrugations.
The overall effect of the apparatus is that as the oil/water mixture progresses along the leng-th of the separator, the oil gathers preferentially towards -the top of the vessel. Oil is withdrawn from -the top of the vessel at the end of -the paths through the parallel plates and purified water from the bottom of the vessel.
A problem arises in aligning the plates with proper separation. The separation is all important since it is the varying separation normal to the direction of general flow which accounts in large part for the resulting co-~L2~ 38~
alescence. Alternative modes of interconnection betweenthe parallel plates are described and illustrated in the two U.S Patents aforementioned.
The conventional arrangement of these and other previously employed separators has a fixed spacing between the plates. Where a different spacing is re~uired di:Eferent plates with modified spacers must be made. The fixed spacing also means that the stacked plates take up a substantial volume when transported. For this reason it has sometimes proved more convenient in the past to fabricate the plates on site for mounting inside the water separator tank.
The prior proposed arrangements are not entirely satisfactory. With a view to mitigating or overcoming the problems inherent in the prior arrangements, a different mode of separating the parallel plates wi~h certain atten-dant advantages is proposed in co-pending Canadian Patent Application No: 342216 and in published British Patent Specification No: 2070451. The aforementioned specifi-cations describe an arrangement for separating the platesin a stack of parallel plates of an oil/water separator between which plates an oil/water mixture is constrained to flow in the conventional fashion by spacing means provided on the plates. The spacing means define alternative first and second predetermined spacings, either of which spacings may be selected between any two adjacent plates of the stack. In the specifically described arrangement in Figs. 3 to 5 of -the aforementioned specifications, the spacing means comprise spacing forms depending from superposed plates at crests in the corru-gations and located in the first spacing in minor indents defined at the crests of underposed plates. The spacing forms are received within similar depending spacing forms at the crests of underposed plates in the second spacing.
The spacing between any two adjacent plates of -the stack may be changed from the first to the second spacing and : .
~æ~s~3~
vice-versa by turning one plate through 180 in its own plane.
The specific embodiment described with reference to Figs. 3 to ~ of the aforementioned specification was pleferably produced by extrusion and fabrication, using polypropylene. A plain corrugated sheet to whatever dimensions were required was first extruded. ~hile the plastics material was still soft, a tool was brought into contact with the crests in the corrugations to form depending portions and indents. The efficiency oi sepa-ration in parallel plate separators depends on the accurate separation of one plate from the next. The separations of Figs. ~ or 5 of the aforementioned co-pending applications were not always readily reproduceable when, for example, plates such as those described therein were fabricated on site. ~dditionally, in a substantial stack of plates, the weight of superposed plates will bear upon the lower plates in the stack and may tend to change the separation, particularly where the separation depends upon an interference between one depending spacing form and another.
Statement of`the I`nvèntion The present invention provides an arrangement within the broad scope of the aforementioned co-pending Canadian patent application but which avoids or overcomes the disadvantages inherent in the specific embodiment described in the said Canadian patent application.
In accordance with the present invention there is provided in one aspect an oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins depending frorn superposed plates at crests in the corrugations thereof and received in said first spacing in respective first location means located on an underposed plate and received in said second spacing in respective second location means provided on said underposed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of underposed plates at the crests thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
In a second and alternative aspect of the present invention there is provided an oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins upstanding from underposed plates at troughs in the corrugations thereof and received in said first spacing in respective first location means located on a superposed plate and received in said second spacing in respective second location means provided on said superposed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of superposed plates at the troughs thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
The invention is hereinafter more particularly described by way of example only with reference to the accompanying drawings.
Brief Description of the Drawings Fig. 1 is a plan view of a preferred embodiment of plate for an oily water separator constructed in accordance with the present invention.
.:
~Z~ 89 Fig. 2 is a side elevational view of the plate of Fig. 1.
Fig. 3 is an enlarged sectional view taken along the line III-III in Fig. 1 and illustrating a depending spacer pin.
Fig. 4 is an enlarged detailed view of a location slot sho~vn in Fig. 1 and with which the spacer pin of Fig. 3 is adapted to co-operate in the location and separation O:e one plate relative to another.
Fig. 5 is an enlarged view in section of the spacing means of three plates constructed as in Fig. 1 in the first relative spacing.
Fig. 6 is a view similar to Fig. 5 showing one plate turned through 180 in its own plane to give the second relative spacing between the plates.
Descri tion of the Prefèrred Embodi`ments p There is shown in plan in Figure 1 a separator plate 10 which in a practical embodiment may suitably have a length of the order of 2 ft. and a width o-f the order of 1 ft. The plate 10 is corrugated, as is clear from the side view of Figure 2. As`shown in the plan view of Figure 1, the plate has a plurality of weep holes 11 which are located along the centre line of the plate and also along the crests of the endmost pair of corrugations at either end of the plate. Spacing means in the form of depending spacer pins 12 best shown in the enlarged sectional view of Figure 3 are located one at the crest of each corrugation along a line separated from the centre line of the plate by a distance D at one side of the plate and along a similar line separated from the centre line o~
the plate by a distance B at the other side of the plate.
A plurality of location slots 13 are similarly located one at the crest of each corrugation along two lines, one separated from the centre line of the plate by a distance D at one side of the plate and the other separated from the centre line of the plate by a distance B at the other side of the plate. Thus, it will be seen that the arrangement of spacer pins 12 and location slots 13 is complementary at the two sides of the plate. Cut-outs 14 located at the respective crests of the corrugation are provided along each longitudinal marginal edge of the plate and serve a locating function when the plate is mounted in a separator tank to ensure that the plates are located in the correct positions both longitudinally and width-wise. One corner 15 of the plate is trimmed along an oblique line for a purpose to be explained below.
Referring now to Figure 3, it will be noted that the spacer pins 12 are integrally formed with the plates as a whole. The pins are essentially cylindrical in -form and are provided with two shoulders 16 and 17 so that the pin effectively tapers from its root to its distal end and defines a wide cylindrical section 18, an intermediate cylindrical section 19 and a distal end cylindrical portion 20. It will also be noted that there is provided on the centre line of the pin and at the crest of the corrugation a recess 21 which is dimensioned to receive the distal end cylindrical portion 20 o-f a superposed plate, as will be explained below.
Referring now to Figure 4, there is shown to an enlarged scale and in plan, one of the slots 13. Slot 13 is elongate and rounded at its ends and has a width W
adapted to receive the intermediate portion 19 of a pin 12 of a superposed plate, again as explained below. The embodiment of plate illustrated in Figures 1 to 3 is adapted to provide two alternative spacings between adjacent plates of a stack.
Referring now to Figures 4 and 5, it will be seen that when identical plates are stacked one on top of each other in the orientation of Figure l, the distal end portion 20 of each pin will be received in the locating recess 21 on the centre line of the equivalent pin 12 of the next underposed plate, as shown in Figure 5. As will ~z~ 9 be apparent from Figure 1 and the complementary arrange-ment of the pins 12 and locating slots 13, if alternative plates are turned through 180 in their own plane, each pin will confront a location slot 13 of the underposed plate rather than the location recess 21 of an underposed plate. As mentioned above, the dimension of the slot 13 is such that the intermediate portion 19 of the pin 12 will be received therethrough with shoulder 16 resting on the sides of the slot, as shown in Figure ~. Thus, with the arrangement described above, either one of two pre-determined alternative spacings may be selected between each adjacent pair of plates. When setting up a stack of plates, the assembling engineer need only check whether the trimmed edges 15 coincide (in which case the wider spacing such as a nominal half inch will be selected) or whether the trimmed edges 15 are present only at each alternative plate of the stack (in which case the narrower spacing, for example a nominal quarter inch, will be selected).
It will be understood that the converse arrangement is also within the scope of the present invention, that is with the spacing pins upstanding from troughs in the corrugations rather than depending from crests in the illustrated arrangement. An illustration of such an arrangement can be seen by turning Fig. 2, for example, upside down.
OIL~ WATER SEPARATOR
Field of the Invention This invention relates to an oily water separator of the plate type and in particular to coalescer plates for use therein.
Bacl~ground of the Invention Examples of conventional oily water separators of the plate type are described in United States Patents 3847813 and 3957656. It will be seen that the basis of the separation resides in the provision of a plurality of corrugated separator plates mounted parallel to one another. The plates are sinusoidal or approximately so in cross section. The oil/water mixture is caused to flow between the parallel plates twhich may be arranged in a parallel horizontal fashion as in U.S Patent 3957656 or in a somewhat inclined fashion as in U.S Patent 38~7813), the effect of the sinusoidal path being alternatively to accelerate and to decelerate the fluid. These changes in velocity of the fluid which occur in directions both tangential to and normal to plate surfaces, combined with the inertial effects of differently sized oil droplets, tend to cause the droplets to coalesce. The coalesced oil droplets are suitably led off through weep holes in the crests of the corrugations.
The overall effect of the apparatus is that as the oil/water mixture progresses along the leng-th of the separator, the oil gathers preferentially towards -the top of the vessel. Oil is withdrawn from -the top of the vessel at the end of -the paths through the parallel plates and purified water from the bottom of the vessel.
A problem arises in aligning the plates with proper separation. The separation is all important since it is the varying separation normal to the direction of general flow which accounts in large part for the resulting co-~L2~ 38~
alescence. Alternative modes of interconnection betweenthe parallel plates are described and illustrated in the two U.S Patents aforementioned.
The conventional arrangement of these and other previously employed separators has a fixed spacing between the plates. Where a different spacing is re~uired di:Eferent plates with modified spacers must be made. The fixed spacing also means that the stacked plates take up a substantial volume when transported. For this reason it has sometimes proved more convenient in the past to fabricate the plates on site for mounting inside the water separator tank.
The prior proposed arrangements are not entirely satisfactory. With a view to mitigating or overcoming the problems inherent in the prior arrangements, a different mode of separating the parallel plates wi~h certain atten-dant advantages is proposed in co-pending Canadian Patent Application No: 342216 and in published British Patent Specification No: 2070451. The aforementioned specifi-cations describe an arrangement for separating the platesin a stack of parallel plates of an oil/water separator between which plates an oil/water mixture is constrained to flow in the conventional fashion by spacing means provided on the plates. The spacing means define alternative first and second predetermined spacings, either of which spacings may be selected between any two adjacent plates of the stack. In the specifically described arrangement in Figs. 3 to 5 of -the aforementioned specifications, the spacing means comprise spacing forms depending from superposed plates at crests in the corru-gations and located in the first spacing in minor indents defined at the crests of underposed plates. The spacing forms are received within similar depending spacing forms at the crests of underposed plates in the second spacing.
The spacing between any two adjacent plates of -the stack may be changed from the first to the second spacing and : .
~æ~s~3~
vice-versa by turning one plate through 180 in its own plane.
The specific embodiment described with reference to Figs. 3 to ~ of the aforementioned specification was pleferably produced by extrusion and fabrication, using polypropylene. A plain corrugated sheet to whatever dimensions were required was first extruded. ~hile the plastics material was still soft, a tool was brought into contact with the crests in the corrugations to form depending portions and indents. The efficiency oi sepa-ration in parallel plate separators depends on the accurate separation of one plate from the next. The separations of Figs. ~ or 5 of the aforementioned co-pending applications were not always readily reproduceable when, for example, plates such as those described therein were fabricated on site. ~dditionally, in a substantial stack of plates, the weight of superposed plates will bear upon the lower plates in the stack and may tend to change the separation, particularly where the separation depends upon an interference between one depending spacing form and another.
Statement of`the I`nvèntion The present invention provides an arrangement within the broad scope of the aforementioned co-pending Canadian patent application but which avoids or overcomes the disadvantages inherent in the specific embodiment described in the said Canadian patent application.
In accordance with the present invention there is provided in one aspect an oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins depending frorn superposed plates at crests in the corrugations thereof and received in said first spacing in respective first location means located on an underposed plate and received in said second spacing in respective second location means provided on said underposed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of underposed plates at the crests thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
In a second and alternative aspect of the present invention there is provided an oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins upstanding from underposed plates at troughs in the corrugations thereof and received in said first spacing in respective first location means located on a superposed plate and received in said second spacing in respective second location means provided on said superposed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of superposed plates at the troughs thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
The invention is hereinafter more particularly described by way of example only with reference to the accompanying drawings.
Brief Description of the Drawings Fig. 1 is a plan view of a preferred embodiment of plate for an oily water separator constructed in accordance with the present invention.
.:
~Z~ 89 Fig. 2 is a side elevational view of the plate of Fig. 1.
Fig. 3 is an enlarged sectional view taken along the line III-III in Fig. 1 and illustrating a depending spacer pin.
Fig. 4 is an enlarged detailed view of a location slot sho~vn in Fig. 1 and with which the spacer pin of Fig. 3 is adapted to co-operate in the location and separation O:e one plate relative to another.
Fig. 5 is an enlarged view in section of the spacing means of three plates constructed as in Fig. 1 in the first relative spacing.
Fig. 6 is a view similar to Fig. 5 showing one plate turned through 180 in its own plane to give the second relative spacing between the plates.
Descri tion of the Prefèrred Embodi`ments p There is shown in plan in Figure 1 a separator plate 10 which in a practical embodiment may suitably have a length of the order of 2 ft. and a width o-f the order of 1 ft. The plate 10 is corrugated, as is clear from the side view of Figure 2. As`shown in the plan view of Figure 1, the plate has a plurality of weep holes 11 which are located along the centre line of the plate and also along the crests of the endmost pair of corrugations at either end of the plate. Spacing means in the form of depending spacer pins 12 best shown in the enlarged sectional view of Figure 3 are located one at the crest of each corrugation along a line separated from the centre line of the plate by a distance D at one side of the plate and along a similar line separated from the centre line o~
the plate by a distance B at the other side of the plate.
A plurality of location slots 13 are similarly located one at the crest of each corrugation along two lines, one separated from the centre line of the plate by a distance D at one side of the plate and the other separated from the centre line of the plate by a distance B at the other side of the plate. Thus, it will be seen that the arrangement of spacer pins 12 and location slots 13 is complementary at the two sides of the plate. Cut-outs 14 located at the respective crests of the corrugation are provided along each longitudinal marginal edge of the plate and serve a locating function when the plate is mounted in a separator tank to ensure that the plates are located in the correct positions both longitudinally and width-wise. One corner 15 of the plate is trimmed along an oblique line for a purpose to be explained below.
Referring now to Figure 3, it will be noted that the spacer pins 12 are integrally formed with the plates as a whole. The pins are essentially cylindrical in -form and are provided with two shoulders 16 and 17 so that the pin effectively tapers from its root to its distal end and defines a wide cylindrical section 18, an intermediate cylindrical section 19 and a distal end cylindrical portion 20. It will also be noted that there is provided on the centre line of the pin and at the crest of the corrugation a recess 21 which is dimensioned to receive the distal end cylindrical portion 20 o-f a superposed plate, as will be explained below.
Referring now to Figure 4, there is shown to an enlarged scale and in plan, one of the slots 13. Slot 13 is elongate and rounded at its ends and has a width W
adapted to receive the intermediate portion 19 of a pin 12 of a superposed plate, again as explained below. The embodiment of plate illustrated in Figures 1 to 3 is adapted to provide two alternative spacings between adjacent plates of a stack.
Referring now to Figures 4 and 5, it will be seen that when identical plates are stacked one on top of each other in the orientation of Figure l, the distal end portion 20 of each pin will be received in the locating recess 21 on the centre line of the equivalent pin 12 of the next underposed plate, as shown in Figure 5. As will ~z~ 9 be apparent from Figure 1 and the complementary arrange-ment of the pins 12 and locating slots 13, if alternative plates are turned through 180 in their own plane, each pin will confront a location slot 13 of the underposed plate rather than the location recess 21 of an underposed plate. As mentioned above, the dimension of the slot 13 is such that the intermediate portion 19 of the pin 12 will be received therethrough with shoulder 16 resting on the sides of the slot, as shown in Figure ~. Thus, with the arrangement described above, either one of two pre-determined alternative spacings may be selected between each adjacent pair of plates. When setting up a stack of plates, the assembling engineer need only check whether the trimmed edges 15 coincide (in which case the wider spacing such as a nominal half inch will be selected) or whether the trimmed edges 15 are present only at each alternative plate of the stack (in which case the narrower spacing, for example a nominal quarter inch, will be selected).
It will be understood that the converse arrangement is also within the scope of the present invention, that is with the spacing pins upstanding from troughs in the corrugations rather than depending from crests in the illustrated arrangement. An illustration of such an arrangement can be seen by turning Fig. 2, for example, upside down.
Claims (6)
1. An oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins depending from superposed plates at crests in the corrugations thereof and received in said first spacing in respective first location means located on an under-posed plate and received in said second spacing in respective second location means provided on said under-posed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of underposed plates at the crests thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
2. An oil/water separator according to Claim 1, wherein the spacer pins have portions intermediate their length of a lateral dimension greater than the lateral dimension of said distal end portions, and wherein said second location means comprise location slots formed in underposed plates at the crests thereof and being spaced from said location recesses, said intermediate portions being received in said second spacing in corresponding said location slots.
3. An oil/water separator according to Claim 1, wherein the spacing between any two adjacent plates of said stack may be changed from said first predetermined spacing to said second predetermined spacing and vice-versa by turning one said plate through 180° in its own plane.
4. An oil/water separator which has a stack of parallel plates between which an oil/water mixture is constrained to flow, the plates being separated in said stack one from the other by spacing means defining alternative first and second predetermined spacings, either of which may be selected between any two adjacent plates of the stack, the spacing means comprising spacer pins upstanding from underposed plates at troughs in the corrugations thereof and received in said first spacing in respective first location means located on a super-posed plate and received in said second spacing in respective second location means provided on said super-posed plate, said first location means comprising location recesses located on the centre lines of similar spacer pins of superposed plates at the troughs thereof, the spacer pins having distal end portions which are received in said first spacing in said location recesses.
5. An oil/water separator according to Claim 4, wherein the spacer pins have portions intermediate their length of a lateral dimension greater than the lateral dimension of said distal end portions, and wherein said second location means comprise location slots formed in superposed plates at the troughs thereof and being spaced from said location recesses, said intermediate portions being received in said second spacing in corresponding said location slots.
6. An oil/water separator according to Claim 4, wherein the spacing between any two adjacent plates of said stack may be changed from said first predetermined spacing to said second predetermined spacing and vice-versa by turning one said plate through 180° in its own plane.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US344,680 | 1982-02-01 | ||
| US06/344,680 US4405459A (en) | 1978-12-19 | 1982-02-01 | Oily water separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1201389A true CA1201389A (en) | 1986-03-04 |
Family
ID=23351539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000420703A Expired CA1201389A (en) | 1982-02-01 | 1983-02-01 | Oily water separator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1201389A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8985343B1 (en) | 2014-01-24 | 2015-03-24 | Kirby Smith Mohr | Method and apparatus for separating immiscible liquids and solids from liquids |
-
1983
- 1983-02-01 CA CA000420703A patent/CA1201389A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8985343B1 (en) | 2014-01-24 | 2015-03-24 | Kirby Smith Mohr | Method and apparatus for separating immiscible liquids and solids from liquids |
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