PLATE SEPARATOR FOR FLUID MIXTURES

Abstract: The coalescing plate (10) is designed to separate immiscible components of differing densities mixed in a fluid. The plate includes bidirectional corrugations forming crests and valleys. Bleed holes (16, 18) are provided in the crests and valleys to allow the immiscible components to pass through. Plural plates are stacked and separated by spacers (20). The spacers (20) are configurated to provide multiple spacing between adjacent plates. The immiscible components less dense than the host fluid migrate upwardly and pass through the bleed holes (16) in the crests. Solids and other components denser than the host fluid move downwardly and pass through the bleed holes (18) in the valleys. The plates are readily cleaned in situ by passing a nozzle (42) through the bleed holes and introducing a cleaning fluid to flush out the space between the plates.

Description: Background of the Invention This invention relates to apparatus for separating immiscible components of different densities mixed in a fluid. It is often necessary to separate immiscible components, including solids, mixed in a fluid. An example is the separation of oil and oily solids mixed with water. Before the water can be discharged, the oily components must be separated and removed. Plate separators are known which include undulating or corrugated plates stacked in a spaced apart configuration to effect separation. See, for example, U.S. Patent Nos. 3,847,813; 3,957,656; 4,278,545, and 4,299,706. In all of these separators, substances such as oil which are less dense than a host fluid such as water migrate upwardly while denser components such as solids drift downwardly. In the configuration shown in United States Patent 4,278,545, lighter components such as oil pass heavier solid components after they have reached the separator plate surfaces. In passing, the components often mix once again diminishing the efficiency of the separator. Furthermore, sludge may form which clogs the spaces between the plates. Summary of the Invention A coalescing plate according to the invention has bidirectional corrugations forming crests and valleys in two directions. The crests and valleys include bleed holes for passage therethrough of immiscible components mixed with a host fluid. Multiple plates may be stacked with spaces between plates maintained by spacers. In a preferred embodiment, the spacers include asymmetrically located multistep projections and asymmetrically located internal passages adapted for mating with identical spacers such that a 180° rotation of one plate results in a different separation from an adjacent plate. In this embodiment the bidirectional corrugations are orthogonal to one another and approximately sinusoidal. Generally, the wavelength of corrugations in one direction is greater than the wavelength of the corrugations in the other direction, and it is preferred that the direction of fluid flow be parallel to the longer wavelength corrugations. Lugs which are removably attached to the lowermost spacer projections are used to provide additional separation between adjacent plates. Plate separation may also be varied in the direction of fluid flow. The separator plates of the present invention are readily cleaned in situ by introducing a nozzle through the bleed holes in the plate and into the space between adjacent plates. The nozzles are configured to spray fluid substantially parallel to the plate surfaces for effective cleaning. The present invention affords numerous advantages over known separators. First of all there is no intermingling of the components after they reach the plate surfaces unlike the configuration in United States Patent 4,278,545. Furthermore, the bidirectional corrugations provide ramps up which the lighter components travel to the upper bleed holes and down which solid and other denser components travel to the bleed holes in the valleys. The bidirectional undulation results in much more surface or collection area per linear dimension of a separator unit. Variable spacing between adjacent plates is readily achieved by rotating a plate 180°. Increased spacing is achieved by utilizing additional spacers. Spacing within a separator unit can be varied in the direction of fluid flow to accommodate changes in the mixture composition as the fluid passes through the separator. The bidirectional corrugations provide stiffness in two directions thereby requiring fewer supports between adjacent plates. Furthermore, the ramps formed by the corrugations result in shorter collection paths than in known configurations. Ease of cleaning the separator stack is another important advantage of the present invention. Prior configurations often had to be disassembled in order to clean them properly. The instant invention allows the stack to be cleaned without disassembly. Brief Description of the Drawing Fig. 1 is a perspective view of a separator plate according to the invention; Fig. 2 is a perspective view of a pair of stacked separator plates; Fig. 3 is a plan view of a separator plate; Fig. 4 is an elevation view of a separator plate; and Fig. 5 is a cross sectional view of the separator plate along section line 5-5 of Fig. 4. Description of the Preferred Embodiment As shown in Fig. 1, a corrugated separator plate 10 has corrugations running in orthogonal directions. The plate 10 may be made of injection moldable plastic or other suitable material including electrically conductive and non-conductive materials. The plates 10 may be stacked in a spaced relationship as shown in Fig. 2. The direction of fluid flow is indicated by an arrow 12. A trough 14 may be located beneath the valley in the plate 10 to catch solid materials. The separator plate 10 will now be described in detail with reference to Figs. 1, 3, 4 and 5. Bleed holes 16 are provided in the crests of the corrugations and bleed holes 18 are provided in the valleys. A suitable diameter for bleed holes 16 and 18 is 0,02 m(three-quarters of an inch) but the diameter may be varied to suit individual requirements. Note that at the edges there are semicircular openings 16a and 18a which form bleed holes when combined with additional separator plates. As shown in Figs. 4 and 5, the corrugations in the orthogonal directions are made up with 45° segments, but the angle can be varied to suit individual requirements. An important aspect of the present invention will now be described in conjunction with Fig. 4. Spacers 20 which may be molded integrally with the plate 10 include multistep projections 22 and 24 which are asymmetrically located with respect to a centerline of the spacer 20. The spacers 20 also include internal passages 26 and 28 which are also asymmetrically located with respect to the centerline of the spacer 20. With this spacer configuration, when the uppermost plate 10 in Fig. 2 is lifted, rotated 180°, and then stacked on the lower plate, the spacing between the two plates will be altered because of different points of engagement. When conditions demand, additional space between the plates 10 can be obtained by utilizing a removable spacer 30 which can be snapped onto the projection 22 of the integral spacer 20. The spacer 20, which can be of a different material from that of the plate 10, can be fabricated separately and inserted into the plate. Although the dimensions of the separator plate 10 are not critical, a convenient size has a length of 0,60 m (two feet) and a width of 0,30 m (one foot) with 0,02 m (three-quarter inch) diameter bleed holes. Because of the semicircular openings 16a and 18a at the edges, multiple plates can be abutted to form large separator areas while maintaining the bleed hole pattern. In the exemplary embodiment illustrated in the figures, the distance between the crests and valleys for one corrugation direction is 0,15 m (six inches) and approximately 0,07 m (2 2/3 inches) for the corrugations running in the other direction. In operation, a stack of separator plates 10 is immersed in a fluid flowing in the direction shown in Fig. 2. Suppose, for example, that the host fluid is water mixed with oil and solid material. As the mixture flows past the plate surfaces, the lighter oil will coalesce and migrate up ramps created by the corrugations and pass through the bleed holes 16 for collection. In a corresponding fashion, solids and other components denser than water will migrate downwardly and pass through bleed holes 18 and be collected in the trough 14. Once the components reach the respective plate 10 surfaces, they do not substantially intermingle which would diminish the efficiency of the separator. If the stack of separator plates is turned upside down, the same function will be performed; the bleed holes 16 will now collect the heavier components and bleed holes 18 the lighter components. It may be desirable to decrease the spacing between the plates 10 as the fluid moves downstream as conditions within the mixture will change. As stated above, the invention permits cleaning without having to remove the plates. As shown in Fig. 4, cleaning is effected by passing a tube 40 through one of the bleed holes such as the bleed hole 16 in a crest. The tip of the tube 40 includes a nozzle portion 42 which directs a fluid spray downwardly as shown. This downward spray is effective in cleaning the downwardly sloping surfaces. Similarly, a tube 40 may be passed through a bleed hole in a valley and include a nozzle adapted to spray fluid upwardly to clean upward sloping surfaces. A suitable cleaning fluid may be the host fluid such as water or a solvent may be used.

Claims: A coalescing plate (10) for separating immiscible components of differing densities in a fluid, characterized in that it comprises bidirectional corrugations forming crests and valleys, the crests and valleys including bleed holes (16, 18) for passage of the immiscible components. A coalescing plate according to claim 1, characterized in that the bidirectional corrugations are oriented orthogonally to one another. A coalescing plate according to claim 1 or 2, characterized in that the corrugations are approximately sinusoidal. A coalenscing plate according to claim 1, characterized in that spacers (20) separate the plate from an adjacent similar plate. A coalescing plate according to claim 4, charaterized in that each of the spacers (20) includes asymmetrically located multistep projections (22, 24) and asymmetrically located internal passages (26, 28) adapted for mating with a similar spacer (20), whereby a 180° rotation of the plate results in a different separation from a similar plate. A coalescing plate according to claim 1, characterized in that the corrugation cross sections include 45° angles. A coalescing plate according to claim 5, characterized in that it includes a lug (30) removably attached to the lowermost spacer projection (24) to provide additional separation between adjacent plates. An apparatus for separating immiscible components of different densities in a horizontally flowing fluid comprising a plurality of horizontally disposed, spaced coalescing plates (10) each of the plates having bidirectional corrugations forming crests and valleys, the crests and valleys including bleed holes (16, 18) for passage of the immiscible components. An apparatus according to claim 8, characterized in that the wavelength of corrugations in one direction is greater than the wavelength of the corrugations in the other direction. An apparatus according to claim 8, characterized in that the direction of fluid flow is parallel to the longer wavelength corrugations. An apparatus according to claim 8, charaterized in that the corrugation cross section of each of the plates includes 45° angles. An apparatus according to claim 8, charaterized in that each of the plates includes spacers (20) to separate the plate from adjacent plates. An apparatus according to claim 9, characterized in that the plurality of spaced coalescing plates is invertible. An apparatus according to claim 12, characterized in that each of the spacers (20) includes asymmetrically located multistep projections (22, 24) and asymmetrically located internal passages (26, 28) adapted for mating with a similar spacer (20), whereby a 180° rotation of the plate results in a different separation from an adjacent plate. An apparatus according to claim 8, characterized in that the separation between plates varies in the direction of fluid flow. An apparatus according to claim 8, characterized in that a cleaning nozzle is adapted to be passed sequentially through the bleed holes in the plate and into the space between adjacent plates and a cleaning fluid passed through the nozzle. An apparatus according to claim 16, characterized in that the nozzle is adapted to direct the cleaning fluid along the corrugations. An apparatus according to claim 16 or 17, characterized in that cleaning fluid is water or a solvent. An apparatus according to claim 8, characterized in that it includes troughs (14) under the bleed holes (18) in the valleys to collect solids and other components denser than the fluid stream.

Inventors: CASTELLI, JOSEPH L.
Applicants: FACET ENTERPRISES, INC.
Application year: 1989
Main classification: B01D17
IPC codes: B01D17, C02F1, B01D21