Packing section and distillation column having the packing section
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-12
- Publication Date
- 2026-08-11
AI Technical Summary
[0006]本实用新型要解决的技术问题是为了克服现有技术中高比表面积填料传质效率提高有限的问题，提供一种用于蒸馏塔的填料段，采用该填料段的蒸馏塔，可充分发挥高比表面积填料的优势，取得优异的传质效率
[0028]本实用新型的积极进步效果在于：
Smart Images
Figure CN224613187U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of distillation column technology, and in particular to a packing section and a distillation column having the packing section. Background Technology
[0002] A distillation column is an important piece of chemical equipment used to separate liquid mixtures. It has wide applications in many fields. For example, in the petrochemical industry, distillation columns can be used to fractionate crude oil into different fractions such as gasoline, kerosene, diesel, and lubricating oil according to their different boiling point ranges. In chemical production, distillation columns can be used to separate and purify organic compounds. In the food and beverage industry, distillation columns can be used to purify alcohol, remove impurities, and improve the purity of alcohol. The uses of distillation columns are very extensive; their core function is to achieve efficient separation and purification by utilizing the differences in the boiling points of the components in a mixture.
[0003] Typically, a distillation column consists of a column body, packing material inside the column, and external components. The packing section is the core of the distillation column, providing ample contact space for the gas and liquid phases. Its main functions are to provide gas-liquid contact surfaces, promote heat and mass transfer, increase the turbulence of the gas and liquid phases, and reduce pressure drop.
[0004] The packing section is formed by stacking packing elements. Taking metal plate corrugated packing as an example, metal strips are processed into corrugated sheets, multiple corrugated sheets are assembled into a unit layer, and multiple unit layers are stacked from bottom to top to form a packing section.
[0005] Improving the efficiency of mass transfer in packing materials is key to enhancing the performance of distillation columns. Therefore, researchers have conducted a series of studies on packing materials, developing new types with specific surface areas exceeding 1000-1800 m² / m³ (such as packing materials specifically for air separation). However, in practice, it has been found that simply increasing the specific surface area of the packing material does not necessarily achieve the expected increase in mass transfer efficiency. Utility Model Content
[0006] The technical problem to be solved by this utility model is to overcome the limited improvement in mass transfer efficiency of high specific surface area packings in the prior art, and to provide a packing section for distillation columns. Distillation columns using this packing section can give full play to the advantages of high specific surface area packings and achieve excellent mass transfer efficiency.
[0007] The present invention solves the above-mentioned technical problems through the following technical solution:
[0008] A packing section for a distillation column, comprising:
[0009] The main body layer is composed of corrugated plate packing, wherein the specific surface area of the corrugated plate packing is ≥800 m². 2 / m3 ;as well as
[0010] A diffusion layer is placed on the main body layer. The diffusion layer is composed of wire mesh corrugated packing or random packing. The diffusion layer has diffusion paths for liquid to diffuse in multiple directions along the cross-section of the distillation column.
[0011] In their research and development of distillation columns using high specific surface area plate corrugated packing, the inventors discovered that when the specific surface area of the plate corrugated packing exceeds 800 m²... 2 / m 3 Increasing the specific surface area of the corrugated packing does not achieve the desired improvement in mass transfer efficiency. Furthermore, even with various liquid distributors, the packing still fails to reach the expected efficiency.
[0012] The investigation results indicate that the poor wettability of high specific surface area metal plate packings is the root cause of the problem. For large specific surface areas (≥800 m²), 2 / m 3 For plate corrugated packing, due to the smaller corrugation height, there are more corrugated plates. After the liquid flows down from the distributor, it mainly diffuses laterally between adjacent corrugated plates, making it difficult to flow across the packing plates, resulting in some corrugated plates drying out. In contrast, plate corrugated packing with a lower specific surface area (≤500 m² / m³) is less affected by this problem.
[0013] Based on the above reasons, the inventors propose adding a diffusion layer to the main layer composed of plate corrugated packing. This diffusion layer is composed of wire mesh corrugated packing or random packing. It can effectively promote liquid flow in multiple directions due to its loose and porous structure and capillary force. Specifically, for wire mesh corrugated packing, the threads of adjacent corrugated sheets contact each other, forming a thread connection path connecting adjacent corrugated sheets. Due to surface tension, the liquid diffuses along this thread connection path, crossing the corrugated sheets of adjacent wire mesh corrugated packing. For random packing, because the particle units of random packing have slender rod structures extending in different directions, when multiple random packing particle units are stacked together and in contact, the slender rod structures of multiple particle units are connected in series, forming a radiating slender rod connection path. Due to surface tension, the liquid diffuses along this slender rod connection path, crossing the corrugated sheets of adjacent wire mesh corrugated packing. In other words, the diffusion layer ensures good dispersion of the liquid entering the main layer, allowing the main layer to fully participate in the mass transfer process, giving full play to the advantages of the high specific surface area corrugated packing, and achieving excellent mass transfer efficiency.
[0014] Understandably, the aforementioned "diffusion path for liquid to diffuse along multiple directions of the distillation column cross-section" refers to the path and related structures through which the liquid flows and diffuses within the distillation column along its cross-section (i.e., horizontally). This can be any single-element cavity or solid structure (such as a filament or rod) that accommodates or guides the liquid's flow and diffusion along the distillation column's cross-section, or an environmental space and structure composed of multiple elements. The aforementioned diffusion along multiple directions of the distillation column cross-section refers to diffusion in at least three directions within the horizontal plane to achieve a better diffusion and wetting effect. Furthermore, the extension direction of this diffusion path and related structures refers to its projection onto the horizontal plane, extending horizontally. This means it promotes liquid diffusion between adjacent corrugated plates and is not limited to extending within the horizontal plane; it can extend within the horizontal plane, extend at a certain angle to the horizontal plane, or extend in three-dimensional space.
[0015] Understandably, the aforementioned "sheet packings" refer to the main body layer in a distillation column primarily used for mass transfer. This includes the path and related structures through which the liquid flows and diffuses along the direction of the corrugated sheets within the main body layer of the distillation column. It can also be called "corrugated sheet packing." Common sheet packings are made of metal sheets, hence the name metal sheet packings. They typically consist of several thin metal sheets with corrugated and perforated surfaces, stacked at a certain angle. The design of this sheet packing structure can follow conventional methods in this field.
[0016] In one embodiment, the specific surface area of the corrugated plate packing is 800-1800 m². 2 / m 3 .
[0017] In one embodiment, the specific surface area of the filler in the diffusion layer is 80-500 m². 2 / m 3 These types of low specific surface area fillers can be used to better promote the diffusion of liquid between adjacent corrugated sheets.
[0018] In one embodiment, the specific surface area of the wire mesh corrugated packing or the random packing of the diffusion layer is smaller than that of the plate corrugated packing.
[0019] In one embodiment, the height of the diffusion layer is 100-400 mm. It is understood that by adding a diffusion layer composed of wire mesh corrugated packing or random packing, the mass transfer efficiency of the main layer can be improved. However, excessively high diffusion layer height may increase costs. Testing has shown that the above-described configuration provides a better diffusion effect.
[0020] In one embodiment, the diffusion layer consists of at least two wire mesh corrugated packing unit layers, which are stacked sequentially along the height direction of the distillation column, and the planes containing the corrugated sheets of adjacent wire mesh corrugated packing unit layers form an angle with each other.
[0021] In one embodiment, the included angle formed by the planes of the corrugated sheets of adjacent wire mesh corrugated packing unit layers is 90 degrees.
[0022] In one embodiment, the random packing includes at least one of Interlocks packing, Pall ring packing, and Nutter ring packing. It is understood that any first- to fourth-generation random packing can be used, with at least one of Interlocks packing (IMTP), Pall ring packing, and Nutter ring packing providing good dispersion.
[0023] In one embodiment, the packing sheets of the wire mesh corrugated packing are woven from fine filaments. The packing material described above exhibits good dispersion performance.
[0024] In one embodiment, the corrugated plate packing has a corrugation angle of 25-70 degrees. Selecting corrugated plate packing with this range of corrugation angles as the main packing layer results in better separation and purification effects.
[0025] On the other hand, this utility model also discloses a distillation column, including the aforementioned packing section.
[0026] The distillation column described above uses the specially designed packing section, which can fully utilize the advantages of high specific surface area plate corrugated packing to achieve excellent mass transfer efficiency.
[0027] In one embodiment, the distillation column includes at least two packing sections arranged along the height of the distillation column, and each packing section is equipped with a liquid distributor above it. It is understood that the separation effect can be improved by sequentially designing multiple packing sections along the height of the distillation column.
[0028] The positive and progressive effects of this utility model are as follows:
[0029] This utility model discloses a packing section in which a diffusion layer is added to the main body layer composed of plate corrugated packing. The diffusion layer is composed of wire mesh corrugated packing or random packing. With its loose and porous structure and capillary force, it can effectively promote the flow of liquid in multiple directions, resulting in better dispersion of liquid entering the main body layer. This allows the main body layer to fully participate in the mass transfer process, giving full play to the advantages of high specific surface area plate corrugated packing and achieving excellent mass transfer efficiency.
[0030] The distillation column of this invention uses the above-mentioned packing section, which has good separation and purification effects. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the packing section structure of Embodiment 1 of this utility model.
[0032] Figure 2 This is a top view schematic diagram of the diffusion layer wire mesh corrugated packing in Embodiment 1 of this utility model.
[0033] Figure 3 This is a schematic diagram of the distillation column structure of Embodiment 3 of this utility model.
[0034] Wherein: 10. Diffusion layer; 11. Upper wire mesh corrugated packing unit layer; 12. Lower wire mesh corrugated packing unit layer; 20. Main body layer; 100. Tower body; 110. Gas phase outlet; 120. Reflux port; 130. Gas phase feed port; 140. Liquid outlet; 150. Liquid phase feed port; 160. First manhole; 170. Second manhole; 200. Reflux pipe; 300. First liquid distributor; 400. First packing section; 500. First support grid; 600. Liquid collector; 700. Second liquid distributor; 800. Second packing section; 900. Second support grid. Detailed Implementation
[0035] Several preferred embodiments are described below, and the present invention will be explained more clearly and completely in conjunction with the accompanying drawings.
[0036] Example 1
[0037] A packing section for use in a distillation column, as shown in Figure 1, includes a main body layer 20 and a diffusion layer 10.
[0038] The main body layer 20 is composed of corrugated metal plate packing. In this embodiment, the corrugated metal plate packing is a conventional high-efficiency corrugated metal plate packing with a specific surface area of 1200 m². 2 / m 3 Specifically, this type of high-efficiency corrugated plate packing increases the specific surface area by shortening the peak height, adjusting the peak spacing, and other methods. In this embodiment, the corrugation angle of the corrugated plate packing is selected as 45 degrees.
[0039] The diffusion layer 10 is placed directly on the main body layer 20. In this embodiment, the diffusion layer 10 is composed of wire mesh corrugated packing. The diffusion layer 10 has diffusion paths for the liquid to diffuse along multiple directions of the distillation column cross-section. The specific surface area of the wire mesh corrugated packing is 500 m². 2 / m 3 The specific surface area of the metal plate corrugated filler is less than that of the main layer 20.
[0040] like Figure 2 As shown, in this embodiment, the height of the diffusion layer 10 is 400mm. The diffusion layer 10 is composed of two wire mesh corrugated packing unit layers. The two wire mesh corrugated packing unit layers are stacked along the height direction of the distillation column, namely the upper wire mesh corrugated packing unit layer 11 and the lower wire mesh corrugated packing unit layer 12, and the planes where the corrugated sheets of adjacent wire mesh corrugated packing unit layers are located are perpendicular to each other.
[0041] Example 2
[0042] A packing section for a distillation column, similar to the packing section in Example 1, differs in that: the diffusion layer in this example uses a specific surface area of 150 m². 2 / m 3 The Pall Ring packing is placed on top of the main layer of plate corrugated packing in a random arrangement.
[0043] Example 3
[0044] A distillation column includes two packed sections as described in Example 1, and each packed section is equipped with a liquid distributor at its top. The structure of the distillation column is as follows: Figure 3 As shown.
[0045] Specifically, the distillation column of this embodiment includes a column body 100 and a reflux pipe 200, a first liquid distributor 300, a first packing section 400, a first support grid 500, a liquid collector 600, a second liquid distributor 700, a second packing section 800, and a second support grid 900 disposed in the column body and arranged from top to bottom and connected to each other.
[0046] The tower body is provided with a gas phase outlet 110 at the top and a reflux port 120 at the top, and the reflux pipe 200 is connected to the reflux port 120. The tower body is provided with a liquid phase inlet 150 in the middle, and the liquid phase inlet 150 is connected to the liquid collector 600. The tower body is provided with a gas phase inlet 130 at the bottom and a liquid outlet 140 at the bottom end. The first liquid distributor 300 and the second liquid distributor 700 are respectively provided with a first manhole 160 and a second manhole 170 above them for easy operation by the operator.
[0047] This distillation column achieves mass transfer separation through countercurrent contact between the gas and liquid phases in the packed section. Specifically, the liquid enters the first liquid distributor 300 from the reflux pipe 200 at the top of the column, or enters the liquid collector 600 from the liquid inlet 150 in the middle of the column, and then passes through the second liquid distributor 700. After being evenly distributed, it flows down along the first packed section 400 or the second packed section 800. During this process, it encounters the gas rising from the bottom of the column through the voids in the packed section. Both form a continuous contact interface on the surface of the packing to complete component transfer. Subsequently, the liquid continues to flow down, and the gas continues to rise. After being enriched at the top of the column or after being transferred again through the first packed section 400, the light component is finally enriched at the top of the column and discharged from the gas outlet 110. The liquid is enriched at the bottom of the column, or after passing through the first packed section 400, it enters the first liquid collector 300, passes through the second liquid distributor 700, and then enters the second packed section 800. Similarly, it encounters the gas in the second packed section to complete component transfer. Subsequently, the liquid continues to flow down, and finally, the heavy component is enriched at the bottom of the column and discharged from the liquid outlet 140.
[0048] It is understandable that the component transfer occurs in the first and second packing sections mentioned above. Multiple packing sections can be designed in combination according to actual working conditions to achieve better separation and purification effects.
Claims
1. A packing section for a distillation column, characterized in that, include: The main body layer is composed of corrugated plate packing, wherein the specific surface area of the corrugated plate packing is ≥800 m². 2 / m 3 ; as well as A diffusion layer is placed on the main body layer. The diffusion layer is composed of wire mesh corrugated packing or random packing. The diffusion layer has diffusion paths for liquid to diffuse in multiple directions along the cross-section of the distillation column.
2. The packing section as described in claim 1, characterized in that, The specific surface area of the corrugated plate packing is 800-1800 m². 2 / m 3 ; And / or, the specific surface area of the filler in the diffusion layer is 80-500 m². 2 / m 3 .
3. The packing section as described in claim 1, characterized in that, The specific surface area of the wire mesh corrugated packing or random packing in the diffusion layer is smaller than that of the plate corrugated packing.
4. The packing section as described in claim 1, characterized in that, The height of the diffusion layer is 100-400mm.
5. The packing section as described in claim 1, characterized in that, The diffusion layer consists of at least two wire mesh corrugated packing unit layers, which are stacked sequentially along the height of the distillation column, and the planes of the corrugated sheets of adjacent wire mesh corrugated packing unit layers are arranged at an angle to each other.
6. The packing section as described in claim 5, characterized in that, The included angle between the planes of two adjacent wire mesh corrugated packing unit layers is 90 degrees.
7. The packing section as described in claim 1, characterized in that, The random packing includes at least one of Interlocks packing, Pall ring packing, and Natter ring packing.
8. The packing section as described in claim 1, characterized in that, The packing sheets of the wire mesh corrugated packing are woven from fine filaments; and / or, the corrugation angle of the plate corrugated packing is 25-70 degrees.
9. A distillation column, characterized in that, Includes the packing section as described in any one of claims 1-8.
10. The distillation column as claimed in claim 9, characterized in that, The packing includes at least one of the packing sections arranged along the height of the distillation column, and each packing section is provided with a liquid distributor above it.