CN1112963C - Folded packing - Google Patents

Abstract

An improved packing made from a plate comprising barriers and holes, said barriers protruding from the surface of the plate. Certain barriers may be rods. The plates can be made into parallel stacks by means of spacers and latches, for example longer rods, which can be latched into adjacent holes. The improved packing can also be formed from strips divided into many strips along the fold lines. The panel sections along the ends of the central panel section are folded alternately along the fold lines so that they are parallel stacks. The end panel sections hingedly connected to the central panel section, ie the end panel sections, can be folded along the side boundaries of the laminate. The stop protrudes from the surface of the strip. Conical strips with a large central plate section, placed inside, can be stacked to approximate a spherical shape.

Description

folded packing

This invention relates to fluid contact structures for packed columns.

Packed columns are used for mass transfer operations such as absorption, desorption, extraction, washing and similar operations. The function of the packing is to promote the mass transfer between the two fluids flowing countercurrently. Increases the efficiency and speed of mass transfer by providing a high surface area filler to facilitate fluid-to-fluid contact and by breaking up the fluid into fine droplets to enhance gas phase mass transfer.

US Patent 4,724,593 discloses a method for making high performance, symmetrical packings with open pore volume. The high-performance packing has been well completed and has won obvious market benefits. Open cell, non-clogging construction provides low pressure drop while dispersing and distributing fluid flow longitudinally and laterally.

However, the internal structure of the packing has a lower porosity than prior art high efficiency packings, and the structure perpendicular to the longitudinal axis is also difficult to process and requires some bending and rolling operations to make the sheet into the packing.

An improved packing is disclosed in co-pending US patent application Ser. No. 08/147,806, filed November 3,1993. The disclosure of this specification is hereby incorporated by reference. Among them, the perforated strip is directly rolled to form a spiral or a coaxial cylindrical structure. The improved filler has a void content from 30% to 98%. It has been unexpectedly found that the roll compacted packings are superior to prior art packings in terms of both mass transfer and efficiency.

In a simple manner, packings having complex shapes according to the invention can also be produced with spaced apart perforated sheets which overlap in a parallel state. Using spacers, such as long rod-like projections that protrude from the face of a panel segment and insert into holes in the opposing panel, or side members, such as side bend straps or separate perforations attached to the edges of overlapping panel segments side panels so that they are secured to each other. The sheet also includes barriers to encourage the breakup of the liquid into droplets.

The bumps raised from the surface of the plate segments also act as barriers to break up large liquid droplets, thereby creating localized turbulence, improving gas and liquid contact and facilitating mass transfer. The bumps may be polygonal flakes that protrude from the surface. Barrier flakes can be diamond-shaped, rectangular or circular. Cylindrical rod bumps protruding from the surface have been found to be very effective in facilitating mass transfer while providing voids above 30% with low pressure drop.

Another way to create effective barriers and holes is to provide a number of elongated cuts in a strip of metal or other stretchable material. If the strip is stretched, the cuts widen and the plates of the strip between adjacent parallel cuts slope upward at an angle to the surface. The incision expands into an elongated hole. The strips can be cut into multiple boards.

The filler of the present invention has a high degree of porosity due to the many perforations provided thereon, the filler has at least about 30% porosity, preferably from 50% to 98%. Barrier flakes attached to the strip serve to increase the surface in contact with the fluid. The barrier sheet is formed by cutting a portion of the outer perimeter of a sheet from the sheet material, leaving a turn. The hinge is then bent and the sheet is lifted off the plate. The panels may also be embossed so that the barrier tabs protrude from the surface of the panel. The raised flakes simultaneously form holes. The sheet can also act as a spacer between adjacent plate sections. The flakes can face up and/or down. The flakes can be at right angles to the surface of the board, or at smaller or larger angles, typically from 20 to 160 degrees.

Plates can be made of metal, thermosetting resins, thermoplastic resins or ceramic precursors (Ceramic Precursors), for example, metal oxides dispersed in an organic binding resin. Perforated panels are formed by stamping, cutting and bending metal or some plastics. The plates are preferably formed by casting, molding or extruding a ceramic or resinous material. After the panel is finally formed, the panel can be fired to cure the resin or convert the blank into the final ceramic article.

The fillers of the invention can be produced from very simple starting materials. Even if compression molding is used to form the panels, the molds used are much cheaper and simpler than those used for prior art high performance packing. The method of the present invention can be used to form packings of complex shape, which cannot be produced by other techniques. The packing according to the invention can be produced at very low cost and it can be made of plastic, metal or ceramic material.

The thickness of the plate can be from 0.1 to 15 mm. In the case of a metallic material, the thickness is generally 0.2 to 0.4 mm. In the case of plastics, the thickness is generally 0.5 to 3 mm, preferably 1 to 2 mm, while in the case of ceramic materials the thickness of the strips is 2 to 8 mm.

The present invention will be better understood, and these and many other features of the present invention, together with attendant advantages, will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Figure 1 is a top view of a strip with a plurality of rod-shaped bumps;

Figure 2 is a perspective view of a pleated packing formed from the strips shown in Figure 1;

Figure 3 is a top view of another embodiment of an apertured strip with additional plates; and

Figure 4 is a perspective assembly view of the strip of Figure 3 folded and attached to an additional panel.

The packing according to the invention can be formed from elongated perforated strips. The strip is continuous from the first end wall to the second end wall. The strip can be divided into a number of plates, separated by bending strips. The bending strips may include arcuate grooves and may include score lines as turning fold lines. The strip may comprise a central panel section, usually a middle section, and end panel sections. The padding is formed by folding the front panel section adjacent the central panel section along the bend strip at right angles to the longitudinal axis of the strip until the bottom surface of the panel section is substantially parallel to the top surface of the central panel section. The bending strip will form the curved side edge which includes the adjacent front panel section. The panel sections are then folded in succession when folding the rear panel section.

The width and length of the strips are determined by the nominal diameter and height required for the packing, the size and surface area of the groove segments. Typically, the packing has a diameter of 1 to 12 inches and a height of about 1 to 10 inches. Pass diameter to height ratio of at least 1. Typical packings have a fill factor of about 3 to 65 per foot and a surface area of about 10 to 200 square feet per cubic foot.

The width of the strip corresponds to the height of the packing in its widest dimension. Typically, strips are at least 5 inches long and go up to 100 inches or more. The spacing between the folded sections depends on the height of the barrier. Typically, the height of the barrier is from 1/16 to 2.0 inches. The blocking members can protrude upwards and downwards, ie some can protrude upwards and some can protrude downwards. There are at least 2 stages of packing, preferably 3 to 30 stages. Occasionally, the nominal diameter of the packing is 1 to 5 inches. Heights are from 1 to 4 inches, and stoppers are from 1/16 to 3/4 inches. The method of the present invention can also be used to produce packings of macromolecular structures of cuboidal or rectangular assemblies, for example, 1' x 1' x 1'; 2' x 1' x 1'; 3' x 1' x 1'. The molecular structure components are placed in the mold and loaded into the tower at the same time until the tower is filled.

The strips may be rectangular with parallel side walls, or have shaped side walls, eg convex, concave, curved or tapered. The width of the plate segments of the strip may be tapered discontinuously. If the side walls of the strip are parallel, the strip can be folded into a square or rectangular packing. If the strip has tapered or stepped sides, the strip can be folded into an X-shaped structure if placed inside the packing with a smaller central section; if placed inside the packing with a larger central section, then The strip can be folded into a polygonal structure.

Strips and plates can have many open structures like meshes or screens. If the strip is sheet material, its barriers and holes can be formed by stamping and bending a suitable material. Said suitable materials are, for example, metals, certain plastics and certain ceramic blanks. Alternatively, the above-mentioned barriers and holes can be formed by molding of a simple pattern, or by casting. Holes are formed in the panels where the barriers are raised from the surface along the complete joint. Where the material can be bent, it can be cut along three sides and bent along a fourth side to form the aperture and stop.

Referring to Figures 1 and 2, strip 200 has a substantially open structure with holes 202 formed therein. A rod stop 204 protrudes from a surface 206 of the strip 200 . Some of the stops 207 are longer. It is adapted to be inserted into holes 205 in opposing plate segments and bolt the plate segments together. Since the spacing is stabilized by the bolting in of the longer stoppers, flex straps 208 may not be required to connect and space the plates.

Panel sections may be spaced from adjacent panel sections by bending strips 208 comprising a set of parallel score lines 210,212. Instead, the flex strips may also include elongated apertures 214 . As shown in FIG. 2 , folding the first front panel section 216 , the strap 208 will fold along the hinge line 220 formed at the score line 210 , and the strap 208 is disposed at right angles to the central panel section 218 . The upstanding strap 208 is then folded along the score line 212 , which is at right angles to the next front panel section 222 , to form a first bend line 224 . Front panel section 222 is folded parallel to central panel section 218 .

Some of the longer stops 207 protruding from the surface of the central panel section 218 are bolted into holes 205 in the opposing folded panel section 216 . Rear panel sections 230 and 240 are folded separately to form packing 250 as shown in FIG. 2 .

Figures 3 and 4 show an alternative method of assembling the packing. Strip 400 has three plate segments 402 , 404 , 406 each comprising a number of holes 408 and barriers 410 , and plates 401 , 403 connected in series by tabs 405 between lugs 407 . The plates 401 , 403 also include holes 408 and barriers 410 . The end panel sections 402 , 406 are folded upward along the score lines 418 , 412 to form a U-shaped outer frame 409 . Breaking tab 405 separates plates 401 and 403 . The individual panels 401 , 403 are equal in length and width to the central panel section 404 and are housed within an outer frame 409 parallel to the central panel section 404 . The side projections 407 are inserted into the holes 408 of the plate segments 402,406 to be bolted together to form the packing 430. The individual panel sections may be joined together by a set of side straps or individual side panels or sections or elongated rods as shown in Figures 1 and 2.

The high-performance complex-shaped packing of the present invention can be produced by simple and low-cost processing technology. Complex shapes can be defined with flat materials and produced by casting, molding, forging or extrusion. It can be made by simple folding steps. The use of strips of different widths, lengths, and thicknesses enables the production of packings with complex shapes. Packing of different sizes can be loaded into the column.

It will be understood that the above only describes the preferred embodiments of the present invention, and numerous substitutions, modifications and changes can be made without departing from the spirit and scope of the present invention as defined by the following claims.

Claims (15)

1. one kind is used for the filler that fluid contacts, and it is characterized in that comprising:

A plurality of single plates that comprise many holes;

The surface of slave plate is from the top and/or the fluid barrier of protruding from the bottom;

By the plate face that is parallel to each other distance piece with the overlapping arrangement of polylith plate; And

From the device that the surface of the mutual bolt of plate plate is together protruded.

2. according to the filler of claim 1, wherein, fluid barrier comprises the bar-shaped projection of surface protrusion of slave plate.

3. according to the filler of claim 2, wherein, make plate become overlapping distance piece and be made of the bar-shaped projection spare of part, it is longer than other projection spare.

4. according to the filler of claim 3, wherein, long excellent part inserts in the hole of relative plate, so that with said plate bolt together.

5. according to the filler of claim 4, wherein, said rod is columniform.

6. according to the filler body of claim 1, wherein, be at least 30% voidage.

7. according to the filler of claim 1, comprising:

Elongated continuous band has perforation, and said band is divided into three plate sections at least along longitudinal axis, and the median plate section has preceding border and border, back, and it is transverse to said longitudinal axis;

The first front panel section is adjacent to preceding border;

Border, the contiguous back of the first back panel section;

The folding said first front panel section promptly along the said preceding said first front panel section of floding at boundary, towards the top surface of median plate section, is parallel to said top surface up to the said first front panel section; With

The folding said first back panel section, promptly along circle, said back, towards the lower surface of median plate section, folding said back panel section is parallel to said lower surface up to the said first back panel section.

8. according to the filler of claim 7, wherein, the plate section width of adjacent central plate section is less than the width of median plate section.

9. according to the filler of claim 7, wherein, comprise 1-10 front panel section, they along the longitudinal axis be linked in sequence, contiguous front panel section has a public border, along said public floding at boundary, make the top surface of its basal surface folded plate section towards the front, and comprise 1-10 back panel section, they along the longitudinal axis be linked in sequence, contiguous back plate section has a public border, along said public floding at boundary, make its top surface towards the front basal surface of folding plate section.

10. according to the filler of claim 7, wherein, at least some fluid barrier are perpendicular to the longitudinal axis of plate.

11. by metal, synthetic resin or pottery are made according to the filler of claim 1.

12. according to the filler of claim 1, wherein, said hole is elongated groove, transverse to the longitudinal axis of plate.

13. according to the filler of claim 7, wherein, the said folding bend line that comprises pair of parallel define a not transverse belt of carrying material between it, and said transverse belt and adjoining plate section forms an angle of 90 degrees.

14. a formation is characterized in that may further comprise the steps by the method for the filler that is used for the fluid contact of claim 1:

Form elongatedly, continuous, flexible, can fold band, this band has many holes;

Fold line is set, and they are spaced along the longitudinal axis of band, to form the plate section, at the preceding border and border, the back fold line of plate section;

Along the folding band of the preceding fold line of the median plate section of band, be parallel to the top surface of median plate section up to the top surface of the header board section of adjacent central plate section; With

Along the folding band of the back fold line of median plate section, be parallel to the lower surface of median plate section up to the lower surface of the back plate section of adjacent central plate section.

15. a manufacturing is characterized in that may further comprise the steps by the method for the filler that is used for the fluid contact of claim 1:

On elongated band, form otch;

Become elongated groove along the y direction drawn polymer tapes so that otch extends, the band between adjacent slot from the surface with angle projectioies from 10 degree to 80 degree; With

Transversely, be parallel to each other up to adjoining plate section in the folding band of the fold line of band longitudinal axis.