CN111644143A - Structured packing and packing layer structure and application thereof - Google Patents
Structured packing and packing layer structure and application thereof Download PDFInfo
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- CN111644143A CN111644143A CN202010545356.9A CN202010545356A CN111644143A CN 111644143 A CN111644143 A CN 111644143A CN 202010545356 A CN202010545356 A CN 202010545356A CN 111644143 A CN111644143 A CN 111644143A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/32—Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
- B01J2219/322—Basic shape of the elements
- B01J2219/32203—Sheets
- B01J2219/32213—Plurality of essentially parallel sheets
Abstract
The invention provides a structured packing and a packing layer structure, which are applied to separating substances with low viscosity or large surface tension, wherein the structured packing is formed by corrugating, punching, cutting and binding silk screen strips, the silk screen strips are woven by spirally winding double-strand silk threads, and the silk screen strips are of a non-uniform weaving density structure and comprise high weaving density areas with the width of a and low weaving density areas positioned on the two sides of the silk screen strips, so that the weaving density area distribution of a dense-sparse-dense structure is formed. Compared with the prior art, the invention solves the problems of wall flow and poor separation effect on low-viscosity or high-surface tension materials from the two aspects of improving the structure of the woven silk thread and the woven structure of the silk thread strips on the premise of no wall flow prevention ring; the longitudinal wall flow prevention structure is adopted to replace a transverse structure, so that a wall flow prevention area is increased, the wall flow prevention effect is improved, and the gas phase is prevented from flowing in a gap between the outer wall of the filler and the inner wall of the tower.
Description
Technical Field
The invention relates to the technical field of rectification, in particular to a structured packing and packing layer structure and application thereof.
Background
The regular packing is different from random packing, is a packing which is in a geometric shape, is arranged in a tower according to a uniform geometric figure and is regularly stacked, the outer side of the regular packing is usually fixed by an upper hoop and a lower hoop with a certain width, and the height of each plate is 40-300 mm. The gas-liquid flow path is regulated and improved, the pressure drop is reduced, and more specific surface area can be provided at the same time, so that higher mass and heat transfer effects are achieved. Therefore, attention has been paid since the advent of structured packing in the last century. Structured packing can be classified into corrugated and non-corrugated types according to the shape of the packing strips, wherein the corrugated type packing strips have regular wave crests and wave troughs, and the structured packing of the type is most widely applied.
Through the development of more than 30 years, the corrugated structured packing is improved in many aspects, and various types such as orifice plate corrugated packing, screen corrugated packing, mesh corrugated packing, screen plate corrugated packing and the like are derived, wherein the screen corrugated packing is applied to various large chemical engineering fields with simple structure and remarkable separation effect. The wire mesh corrugated packing is composed of corrugated wire mesh strips which are vertically arranged and are in a cylindrical disc shape, the directions of two adjacent corrugations are opposite, and holes can be formed in the corrugated strips at certain intervals. The corrugated silk screen strip is made of silk screen through punching regular corrugations. The screen mesh is woven by metal monofilaments by using a method such as plain weaving, twill weaving or microgroove weaving. Obviously, compared with other corrugated packings such as plate corrugations and the like of the same type, the wire mesh corrugated packing has higher specific surface area, higher wetting capacity to liquid phase and easier film formation, thereby having better separation effect.
With the improvement of the packing, the specific surface area of the wire mesh corrugated packing is higher and higher, and the separation efficiency is improved continuously, and the influence of the rectification column wall flow phenomenon on the separation efficiency is larger and larger. Wall flow refers to the situation where the liquid phase in the column flows down directly along the column wall after contacting the column wall. The size of the wall flow directly determines the liquid amount flowing to the surface of the filler, the reduction of the liquid amount reduces the thickness of the liquid film, and the wetting of the filler is not uniform in severe cases, so that the original separation effect of the filler is greatly reduced. At present, the wall flow phenomenon is reduced by adding a wall flow prevention ring of a silk screen outside the regular packing in the industry. Since the anti-wall flow region is in the horizontal direction, it can be referred to as a transverse anti-wall flow structure. CN104275144A discloses a common design of wall flow preventing ring, where each disk of packing is installed with a ring of wall flow preventing ring with an outward flanging structure, the outer side of the packing contacts with the column wall through the wall flow preventing ring, and when the liquid on the column wall flows downward and contacts with the wall flow preventing ring, the wall flow preventing ring will guide the liquid to flow back to the surface of the packing again. But because of the structural characteristics of the wall flow preventing ring, the outer diameter of the packing is certainly slightly smaller than the inner diameter of the rectifying tower when in use.
Due to the simple structure of the anti-wall flow ring, the obvious action principle and the effect proved by practice, the anti-wall flow ring becomes generally accepted in the industry after the first appearance. CN1125673C considers that the anti-wall flow ring can reduce the wall flow phenomenon, so it is certainly considered that the anti-wall flow ring can improve the separation efficiency of the packing, which is a consistent opinion in the industry, and the above idea is held for separating all substances. However, there is no strict causal relationship between the wall flow reduction phenomenon by the anti-wall flow ring and the improved separation of the packing, because there is a recognized error zone in the industry: the presence of the anti-wall flow ring is believed to have far less of a detrimental effect on separation than a beneficial effect.
For substances with small viscosity or large surface tension, especially under the condition that the inner diameter of the tower is not more than 1000mm, the existence of the wall flow prevention rings arranged around the existing filler cannot ideally reduce the wall flow phenomenon, and also aggravates the unbalance of gas-liquid phase distribution in the tower, so that less liquid phase and gas phase are well contacted on the surface of the filler, and in addition, the efficiency of the filler of the substances is reduced, so that the actual separation effect is far from the nominal separation effect of the filler, and sometimes the actual effect is even 30%. However, the current solution to this problem in the industry is to increase the height of the packing, which does not solve the problem at all, and increases the tower height, cost, and difficulty of manufacturing and installation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a regular packing and application thereof, and solves the problems of wall flow and poor separation effect on low-viscosity or high-surface-tension materials from the aspects of improving the structure of a woven silk thread and the woven structure of silk-screen strips on the premise of not installing a wall-flow prevention ring.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a regular packing, which is applied to the process of separating substances with low viscosity or large surface tension and mainly comprises the following two improvements, wherein the packing is woven by winding yarns, and a longitudinal anti-wall flow structure is adopted to replace a transverse anti-wall flow structure in the prior art.
The structured packing is formed by binding and fixing a plurality of corrugated silk screen strips, wherein the corrugated silk screen strips are vertical to the horizontal plane, the adjacent corrugated silk screen strips are arranged in parallel, the corrugated silk screen strips are formed by corrugated stamping and cutting of the silk screen strips, and the silk screen strips are formed by weaving spiral winding type double-strand silk yarns.
Further, the spirally wound type bifilar filament includes a main filament and an auxiliary filament, the main filament and the auxiliary filament forming a double spiral winding configuration or a single spiral winding configuration.
Further, in the double spiral winding configuration, the primary wire and the secondary wire are spirally wound around each other.
Further, the thread pitch of the main thread is 2-4 times of the thread diameter of the main thread.
Further, in the single spiral winding configuration, the primary wire is spirally wound on the secondary wire.
Furthermore, the thread pitch of the main thread is 1-5 times of the thread diameter of the main thread.
Further, the diameter of the main yarn and the auxiliary yarn is 0.03mm to 0.4mm, preferably 0.04mm to 0.3 mm.
Further, the weaving method of the spiral winding type double-strand silk thread is one of plain weaving, twill weaving or microgroove weaving;
further, in the weaving process, a cis-type arrangement or a reverse-type arrangement is adopted.
Further, when the cis arrangement is adopted, the spiral winding direction between the adjacent main filaments is the same.
Further, when the reverse arrangement is adopted, the spiral winding directions between the adjacent main filaments are opposite.
Furthermore, the silk screen strip is of a non-uniform weaving density structure and comprises a high weaving density area and a low weaving density area, wherein the high weaving density area and the low weaving density area are respectively located on two sides of the silk screen strip and are both a in width.
Further, the number of knitting meshes of the high knitting density region is 10 to 50 meshes larger than that of the low knitting density region.
Further, a is 5% to 15% of the inner diameter d of the packed column, and a is not less than 10 mm.
Furthermore, the outer diameter of the structured packing is 40 mm-1000 mm, the structured packing is bundled into a cylindrical disc configuration, the height of each disc is 40 mm-300 mm, and each disc contains 5-500 silk screen corrugated strips.
Further, the high weave density regions may not have an open cell structure, or the low weave density regions may not have an open cell structure.
Further preferably, the number of the knitting meshes of the area with the width a is 20-40 meshes higher than the middle part of the strip.
Furthermore, the regular packing of the invention does not have a wall flow prevention ring and a hoop ring and is tightly attached to the tower wall when in use.
Further, the inclination angle between the direction of the corrugations in the corrugated silk screen strip and the vertical direction is 30-45 degrees.
When the structured packing is prepared into a packing layer structure in a stacking mode: specifically, the vertical disc-by-disc staggered stacking is carried out, wherein the staggered arrangement refers to that corrugated wire mesh strips in upper and lower adjacent fillers are arranged in a phase difference of 15-90 degrees, namely, the discs are sequentially staggered by 15-90 degrees in a counterclockwise or clockwise rotating mode.
When the structured packing layer structure is specifically applied to material separation, the structured packing layer structure is filled in a packing filling area of a separation tower.
Further, the tower diameter of the separation tower is less than or equal to 1000 mm.
Furthermore, the filler is suitable for substances with low viscosity or large surface tension, and the filler layer is suitable for improving the separation efficiency when any one condition is met.
Further, the viscosity of the material is less than 0.6cP, in particular less than 0.3cP, or the surface tension is greater than 0.03N/m, in particular greater than 0.05N/m.
When the unit regular packing is used as a regular packing structure, the regular packing structure is formed by vertically stacking the regular packing disc by disc, and corrugated wire mesh strips in the upper and lower adjacent packings are arranged in a phase difference of 15-90 degrees through horizontal rotation, so that a longitudinal wall flow prevention structure is formed to replace a transverse structure, a wall flow prevention area is increased, a wall flow prevention effect is improved, and gas phase is prevented from flowing in a gap between the outer wall of the packing and the inner wall of the tower.
When the structured packing structure is applied to material separation, the structured packing structure is filled in a packing filling area of a separation tower, and the tower diameter of the separation tower is less than or equal to 1000 mm. In the case of a column diameter of less than 1000mm, the gas phase will flow through the gaps with a significant adverse effect on the separation. And this technical scheme adopts the vertical to prevent the wall flow structure and replaces horizontal structure, has increased and has prevented the wall flow region, has improved and has prevented the wall flow effect, has stopped the clearance flow of gaseous phase. The filler of the invention does not have a wall flow prevention ring and a hoop ring, and is fixed by binding a corrugated silk screen strip with a metal wire. The two sides of each corrugated wire mesh strip in the horizontal direction are respectively provided with an area with the width a, the weaving density of the area is higher than that of the middle part of each corrugated wire mesh strip, and when the corrugated wire mesh strip is used, the packing is tightly attached to the tower wall, so that the wall flow is guided to the middle part of each corrugated wire mesh strip after contacting the area, and the effect of preventing the wall flow is achieved. Although the wall flow prevention area of each packing disc is an area formed by two ends of the corrugated wire mesh strip and does not cover all circumferential directions, when the packing disc is installed, the upper and lower adjacent packing discs rotate circumferentially for a certain angle, and a longitudinal wall flow prevention structure is formed, so that the wall flow prevention area can be ensured to cover all circumferential positions.
Compared with the prior art, the invention has the following advantages:
1) the filler has higher mass transfer efficiency and higher separation efficiency under the same pressure drop. This technical scheme adopts the silk screen that two strand silk threads of spiral winding type were woven, compares current packing and has abundant spiral winding clearance, and fashioned packing has higher specific surface area, has improved the wet ability of packing, and thicker silk screen has improved the dwell time of material on the packing surface to the packing has higher separation efficiency.
2) The structured packing is particularly suitable for separating substances with large surface tension or small viscosity, and the separation efficiency of the structured packing is greatly improved compared with that of the conventional wire mesh corrugated packing. The liquid phase with larger surface tension is easier to spread and wet on the surface of the silk screen woven by the spiral winding type double-strand silk threads, and a liquid film with uniform thickness is formed. The less viscous liquid phase has sufficient adhesion in rich, uniform winding gaps, is less prone to dripping, and has a longer residence time on the thicker wire mesh surface, thereby achieving sufficient heat and mass transfer.
3) The longitudinal wall flow prevention structure is adopted to replace a transverse structure, so that a wall flow prevention area is increased, the wall flow prevention effect is improved, and the gas phase is prevented from flowing in a gap between the outer wall of the filler and the inner wall of the tower. The technical scheme is that the dense-sparse-dense structure is distributed in the weaving density area, and when the packing is used, the packing is tightly attached to the tower wall, so that wall flow is guided to the middle of the corrugated wire mesh strip after contacting the area, and the effect of preventing wall flow is achieved.
Drawings
FIG. 1 is a schematic view of a structure in which main and auxiliary wires are wound around each other according to the present invention;
FIG. 2 is a schematic structural view of the main yarn winding auxiliary yarn of the present invention;
FIG. 3 is a schematic diagram of the cis arrangement of the present invention;
FIG. 4 is a schematic structural view of the reverse arrangement of the present invention;
FIG. 5 is a schematic cross-sectional view of the installation of structured packing in a column according to the present invention;
fig. 6 is a schematic cross-sectional view of a prior art packing having a wall flow stop ring installed in a column.
In the figure: 1. main filament, 2, auxiliary filament.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
In the embodiment, deionized water is used as a raw material to separate heavy water, the system has larger surface tension and can generally represent the separation of an aqueous mixture, and a rectifying tower with the inner diameter of 100mm is used for the separation.
The main wire and the auxiliary wire of the winding silk thread are respectively made of 304 stainless steel and copper, the diameters of the main wire 1 and the auxiliary wire 2 are respectively 0.22mm and 0.04mm, the winding mode that the main wire 1 winds the auxiliary wire 2 is adopted (see figure 2), the thread pitch of the main wire 1 is 0.28mm, and the silk screen weaving method adopts twill weaving and reverse arrangement (see figure 4). The screen strip is made by cutting the screen, the weaving mesh number of the areas with the width of 10mm on both sides of the screen strip in the horizontal direction is 100 meshes, the weaving mesh number of the middle part of the corrugated screen strip is 80 meshes, and no hole is formed in the middle part of the screen strip.
The corrugated silk screen strip is made by punching corrugations from the silk screen strip, the peak height of the corrugations is 6.3mm, the wave distance is 10.2mm, the side length is 8.1mm, and the inclination angle between the corrugated direction and the vertical direction is 30 degrees.
The number of the corrugated wire mesh strips is equal to the rounding of the ratio of the inner diameter of the tower to the peak height. The structured packing is made by binding and fixing 16 sheets of the corrugated silk screen strips at the upper part and the lower part by 1mm of metal wires, the height of each disc of packing is 100mm, and the outer diameter is 100.8 mm. When the packing device is installed, the upper and lower adjacent packing trays rotate 90 degrees in the anticlockwise circumferential direction.
The static liquid holdup of the filler is 3.5 liters per cubic meter of filler through measurement, and each meter of theoretical plate is 5.4 blocks. (the larger the static liquid holdup is, the better the wetting property of the filler is reflected, and the larger the theoretical plate per meter is, the higher the separation capability of the filler is reflected.)
Example 2
In this example, a mixture of chlorotrifluoroethylene and difluorochloroethane was used as a raw material to separate chlorotrifluoroethylene. The system has low viscosity, can generally represent the separation of halogenated hydrocarbon, in particular the separation of the chlorofluorocarbon of carbon 5 and below, and adopts a rectifying tower with the inner diameter of 300 mm.
The main wire 1 and the auxiliary wire 2 of the winding silk thread are respectively made of phosphor bronze and 316L stainless steel, the diameters of the main wire 1 and the auxiliary wire 2 are respectively 0.35mm and 0.03mm, the winding mode that the main wire 1 and the auxiliary wire 2 are mutually wound is adopted (see figure 1), the thread pitch of the main wire 1 is 0.78mm, and the silk screen weaving method adopts twill weaving and cis arrangement (see figure 3). The screen strip is made by cutting the screen, the weaving mesh number of the areas with the width of 50mm on both sides in the horizontal direction is 100 meshes, and the weaving mesh number of the middle part of the corrugated screen strip is 80 meshes. The middle part of the silk screen strip is not provided with a hole.
The corrugated silk screen strip is made by punching corrugations from the silk screen strip, the peak height of the corrugations is 4.3mm, the wave distance is 7.3mm, the side length is 5.6mm, and the inclination angle between the corrugated direction and the vertical direction is 45 degrees.
The number of the corrugated wire mesh strips is equal to the rounding of the ratio of the inner diameter of the tower to the peak height. The structured packing is made by binding and fixing 70 pieces of the corrugated silk screen strips with 1mm of metal wires at three positions, namely the upper part, the middle part and the lower part, wherein the height of each disc of packing is 150mm, and the outer diameter is 301 mm. When the packing is installed, the upper and lower adjacent packing trays are rotated by 15 degrees in the counterclockwise circumferential direction (see fig. 5, the dotted hatching represents the tower wall, and the oblique hatching represents the wall flow prevention region).
The static liquid holdup of the filler is 3.8 liters per cubic meter of filler through measurement, and each meter of theoretical plate is 7.6 blocks.
Example 3
In the embodiment, a mixture of n-heptane and methylcyclohexane is used as a raw material, and n-heptane separation is performed as an example, the surface tension and viscosity of the system are moderate, and the system can generally represent separation of common organic matters. The separation was carried out using a rectifying column with an internal diameter of 500 mm.
The main wire 1 and the auxiliary wire 2 of the winding silk thread are both made of 316L stainless steel, the diameters of the main wire 1 and the auxiliary wire 2 are both 0.3mm, the winding mode that the main wire 1 winds the auxiliary wire 2 is adopted, the thread pitch of the main wire 1 is 0.35mm, and the silk screen weaving method adopts plain weaving and cis arrangement. The screen strips are made by cutting the screen, the weaving mesh number of the areas with the width of 30mm on both sides in the horizontal direction is 70 meshes, and the weaving mesh number of the middle part of the strip is 60 meshes. The middle part of the silk screen strip is provided with a round hole with the diameter of 2mm, the center distance between the holes is 20mm, and the holes are arranged in a square shape.
The corrugated silk screen strip is made by punching corrugations from the silk screen strip, the peak height of the corrugations is 6.2mm, the wave distance is 10.2mm, the side length is 8.1mm, and the inclination angle between the corrugated direction and the vertical direction is 30 degrees.
The number of the corrugated wire mesh strips is equal to the rounding of the ratio of the inner diameter of the tower to the peak height. The structured packing is made by binding and fixing 81 sheets of the corrugated silk screen strips with 1.5mm metal wires at three positions of the upper part, the middle part and the lower part, the height of each disc of packing is 200mm, and the outer diameter is 502 mm. When the packing device is installed, the upper and lower adjacent packing trays rotate 90 degrees in the anticlockwise circumferential direction.
The static liquid holdup of the filler is 3.4 liters per cubic meter of filler through measurement, and each meter of theoretical plate is 5.8 blocks.
Comparative example 1
Using example 1 as a comparative reference, the wire mesh corrugated packing parameters for comparison were: the method is characterized in that an 80-mesh wire mesh with the wire diameter of 0.22mm is adopted, twill weaving is carried out, holes are not formed in the middle of each wire mesh strip, the peak height, the wave distance, the side length and the inclination angle are the same as those of embodiment 1, the number of corrugated wire mesh strips is 14, the corrugated wire mesh strips are provided with wall flow prevention rings, the outer diameter of packing materials without the wall flow prevention rings is 88.2mm, and the distribution structure of the packing layers is adopted (see figure 6, dotted shading represents a tower wall, and oblique line shading represents a wall flow prevention area.
The static liquid holdup of the filler is measured to be 2.8 liters per cubic meter of filler, and each meter of theoretical plate is 4. Comparing the structured packing of example 1 to the packing of comparative example 1, the separation capacity of the packing of example 1 was increased by 35.0%.
Comparative example 2
With example 2 as a reference, the comparative wire mesh corrugated packing parameters are: the 80-mesh silk screen with the silk diameter of 0.35mm is adopted, twill weaving is carried out, the middle parts of strips of the silk screen are not provided with holes, the peak height, the wave distance, the side length and the inclination angle are the same as those of the embodiment 2, the number of strips of the corrugated silk screen is 68, the corrugated silk screen has the wall flow prevention ring, and the outer diameter of the filler excluding the wall flow prevention ring is 292.4 mm.
The static liquid holdup of the filler is measured to be 2.9 liters per cubic meter of filler, and each meter of theoretical plate is 4.9 blocks. Comparing the structured packing of example 2 to the packing of comparative example 2, the separation capacity of the packing of example 2 was improved by 55.1%.
Comparative example 3
With example 3 as a reference, the comparative wire mesh corrugated packing parameters are: the wire mesh with the diameter of 0.3mm and 60 meshes is adopted, twill weaving is carried out, round holes with the diameter of 2mm are formed in the wire mesh, the center distance between the holes is 20mm, and the holes are arranged in a square shape. The packing peak height, the wave distance, the side length and the inclination angle are the same as those of the embodiment 3, the number of the corrugated wire mesh strips is 78, the corrugated wire mesh strips are provided with the wall flow preventing ring, and the outer diameter of the packing is 483.6mm without counting the wall flow preventing ring.
The static liquid holdup of the filler is 3.1 liters per cubic meter of filler through measurement, and each meter of theoretical plate is 5 blocks. The separation capacity of the structured packing of example 3 was increased by 16.0% over the packing of comparative example 3.
Comparative example 4
Taking deionized water as raw material, heavy water separation is taken as an example. The separation was carried out using a rectifying column with an internal diameter of 100 mm.
The main wire 1 and the auxiliary wire 2 of the winding silk thread are made of 304 stainless steel and copper respectively, the diameters of the main wire 1 and the auxiliary wire 2 are 0.22mm and 0.04mm respectively, the winding mode that the main wire 1 winds the auxiliary wire 2 is adopted, the thread pitch of the main wire 1 is 0.28mm, and the silk screen weaving method adopts twill weaving and reverse arrangement. The silk screen strips are made by cutting the silk screen, the weaving mesh number of the areas with the width of 10mm on the two sides of the horizontal direction is 100 meshes, the weaving mesh number of the middle part of the strips is 80 meshes, and the middle part of the silk screen strips is not provided with holes. The corrugated silk screen strip is made by punching corrugations after the silk screen is cut, the peak height of the corrugations is 6.3mm, the wave distance is 10.2mm, the side length is 8.1mm, and the inclination angle between the corrugated direction and the vertical direction is 30 degrees.
The number of the corrugated wire mesh strips is equal to the ratio of the inner diameter of the tower minus the thickness of the wall flow preventing ring to the peak height. The structured packing is made by fixing 14 sheets of the corrugated silk screen strip sheets at the upper part and the lower part by using hoops with the width of 20mm, and the outer side of the upper hoops is provided with wall flow preventing rings. The height of each disk of packing is 100mm, the outer diameter of the packing excluding the wall flow prevention ring is 88.2mm, and the outer diameter of the packing counting the wall flow prevention ring is 100 mm. When the packing device is installed, the upper and lower adjacent packing trays rotate 90 degrees in the anticlockwise circumferential direction.
The static liquid holdup of the filler is 3.2 liters per cubic meter of filler through measurement, and each meter of theoretical plate is 5.0 blocks. Comparing comparative example 4 with comparative example 1, the separation capacity of the filler in comparative example 4 was improved by 25.0%. Compared with example 1, the filler in comparative example 4 adopts the spiral winding type double-strand silk threads to weave and weave the density region distribution of the dense-sparse-dense structure, but the existence of the wall flow preventing ring causes the gap flow of the gas phase, so that the separation capacity is improved to a limited extent.
Comparative example 5
Taking deionized water as raw material, heavy water separation is taken as an example. The separation was carried out using a rectifying column with an internal diameter of 100 mm.
The weaving method is characterized in that a twill-woven silk screen with the silk diameter of 0.22mm is adopted, silk screen strips are made by cutting the silk screen, the weaving mesh number of each 10 mm-wide area on two sides in the horizontal direction is 100 meshes, the weaving mesh number of the middle part of each corrugated silk screen strip is 80 meshes, and no hole is formed in the middle part of each silk screen strip. The corrugated silk screen strip is made by punching corrugations from the silk screen strip, the peak height of the corrugations is 6.3mm, the wave distance is 10.2mm, the side length is 8.1mm, and the inclination angle between the corrugated direction and the vertical direction is 30 degrees.
The number of the corrugated wire mesh strips is equal to the rounding of the ratio of the inner diameter of the tower to the peak height. The structured packing is made by binding and fixing 16 sheets of the corrugated silk screen strips at the upper part and the lower part by 1mm of metal wires, the height of each disc of packing is 100mm, and the outer diameter is 100.8 mm. When the packing device is installed, the upper and lower adjacent packing trays rotate 90 degrees in the anticlockwise circumferential direction.
The static liquid holdup of the filler is measured to be 2.9 liters per cubic meter of filler, and each meter of theoretical plate is 4.4 blocks. Comparing comparative example 5 with comparative example 1, the separation ability of the filler in comparative example 5 was improved by 10.0%. Compared with example 1, the filler in comparative example 5 adopts a dense-sparse-dense structure with a weaving density region distributed and tightly attached to the tower wall, but does not use a silk screen woven by spiral winding type double-strand silk threads, so that the wetting capacity is low, and the separation capacity is improved to a limited extent.
Comparative example 6
The comparative wire mesh corrugated packing parameters are as follows, with example 1 as a reference.
The main wire 1 and the auxiliary wire 2 of the winding silk thread are made of 304 stainless steel and copper respectively, the diameters of the main wire 1 and the auxiliary wire 2 are 0.22mm and 0.04mm respectively, the winding mode that the main wire 1 winds the auxiliary wire 2 is adopted, the thread pitch of the main wire 1 is 0.28mm, and the silk screen weaving method adopts twill weaving and reverse arrangement. The silk screen strips are made by cutting the silk screen, the weaving mesh number is 80 meshes, and no hole is formed in the middle of each silk screen strip. The corrugated silk screen strip is made by punching corrugations after the silk screen is cut, the peak height of the corrugations is 6.3mm, the wave distance is 10.2mm, the side length is 8.1mm, and the inclination angle between the corrugated direction and the vertical direction is 30 degrees.
The number of the corrugated wire mesh strips is equal to the rounding of the ratio of the inner diameter of the tower to the peak height. The structured packing is made by binding and fixing 16 sheets of the corrugated silk screen strips at the upper part and the lower part by 1mm of metal wires, the height of each disc of packing is 100mm, and the outer diameter is 100.8 mm. When the packing device is installed, the upper and lower adjacent packing trays rotate 90 degrees in the anticlockwise circumferential direction.
The static liquid holdup of the filler is 3.0 liters per cubic meter of filler through measurement, and each meter of theoretical plate is 4.8 blocks. Compared with the comparative example 1, the separation capacity of the filler in the comparative example 6 is improved by 20.0%, compared with the example 1, the filler in the comparative example 6 is woven by adopting the spiral winding type double-strand silk threads and is tightly attached to the tower wall, but because the woven density area distribution of a dense-sparse-dense structure is not adopted, the wall flow cannot be effectively introduced into the filler, the liquid amount flowing to the surface of the filler is reduced, and the separation capacity is improved to a limited extent.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A structured packing is formed by binding and fixing a plurality of corrugated silk screen strips, wherein the corrugated silk screen strips are vertical to a horizontal plane, the adjacent corrugated silk screen strips are arranged in parallel, and the corrugated silk screen strips are formed by performing corrugated stamping and cutting on the silk screen strips;
the silk screen strips are of a non-uniform weaving density structure and comprise high weaving density areas which are respectively positioned at two sides of the silk screen strips and have the width of a and low weaving density areas which are positioned in the middle of the silk screen strips, and the weaving density area distribution of the dense-sparse-dense structure is formed.
2. A structured packing according to claim 1, wherein the helically wound bifilar filaments comprise a primary filament (1) and a secondary filament (2), the primary filament (1) and the secondary filament (2) forming a double helix winding configuration or a single helix winding configuration.
3. The structured packing according to claim 2, wherein the primary filaments (1) and the secondary filaments (2) are helically wound around each other in the double helix winding configuration, and the pitch of the primary filaments (1) is 2 to 4 times the diameter of the primary filaments (1).
4. The structured packing of claim 2, wherein the primary filaments (1) are helically wound around the secondary filaments (2) in the single helical winding configuration, and wherein the pitch of the primary filaments (1) is 1 to 5 times the diameter of the primary filaments (1).
5. A structured packing according to claim 2, wherein the spirally wound, doubled yarn is woven in one of a plain weave, a twill weave, or a microgroove weave;
in the weaving process, cis-arrangement or reverse-arrangement is adopted;
when the straight arrangement is adopted, the spiral winding directions between the adjacent main filaments (1) are the same;
when the reverse arrangement is adopted, the spiral winding directions between the adjacent main wires (1) are opposite.
6. The structured packing of claim 1 wherein the high braid density regions have a braid count between 10 and 50 greater than the braid count of the low braid density regions.
7. A structured packing according to claim 6 wherein a is from 5% to 15% of the internal diameter d of the packed column and a is not less than 10 mm.
8. The structured packing of claim 1, wherein the structured packing is bundled in a cylindrical disk configuration, each disk having an outer diameter of 40mm to 1000mm and a height of 40mm to 300mm, and wherein each disk comprises 5 to 500 wire mesh corrugated strips.
9. A structured packing layer structure, wherein the structured packing layer structure is formed by stacking the structured packing of any one of claims 1 to 8 vertically disk by disk, and corrugated wire mesh strips in upper and lower adjacent packings are arranged with a phase difference of 15 ° to 90 °.
10. Use of a structured packing layer structure according to claim 9 in the separation of materials, characterized in that the structured packing layer structure is packed in a packing region of a separation column having a column diameter of 1000mm or less, the viscosity of the materials being less than 0.6cP or the surface tension being greater than 0.03N/m.
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