A bed structure for a molecular sieve adsorber based on johnson nets

Abstract

The utility model provides a molecular sieve adsorber bed layer structure based on johnson net, through setting the johnson net of specific mesh size as gas distributor under adsorbent bed layer, and can optionally embed the johnson net support layer in the inside bed layer, effectively solved the traditional adsorber airflow distribution uneven, high pressure drop, low regeneration efficiency technical problem. The structure utilizes the high open area of johnson net and the wedge shape silk self -cleaning characteristic, significantly improved the gas distribution uniformity, reduced the system energy consumption, simultaneously through the clearance cooperation of optimization net layer and adsorbent counter current regeneration process, makes the desorption efficiency to improve 15% or above, realized the synchronous promotion of adsorption capacity and regeneration efficiency.

Description

Technical Field

[0001] This invention belongs to the field of molecular sieve adsorber technology, specifically relating to a molecular sieve adsorber bed structure based on Johnson nets. Background Technology

[0002] In molecular sieve adsorption systems used in air separation, petrochemical, and other fields, the adsorber is a key piece of equipment for gas purification. Its performance directly affects the stability of subsequent processes and the quality of the product gas. However, in actual operation, uneven gas flow distribution into the adsorber often leads to premature breakthrough or saturation of local adsorbents, resulting in problems such as decreased adsorption capacity, increased regeneration energy consumption, and shortened service life.

[0003] While traditional gas distributors can improve flow field uniformity to some extent, they are typically complex in structure, expensive to manufacture, and prone to generating high airflow resistance, leading to increased overall system pressure drop and higher operating energy consumption. Therefore, developing a gas distribution device that combines low resistance with good distribution performance is of great significance for improving adsorber efficiency.

[0004] Johnson mesh, a high-performance porous metal mesh material, features high porosity, low flow resistance, excellent mechanical strength, and high temperature resistance, and has been widely used in chemical equipment such as filtration, sieving, and catalytic reactors. However, there are currently no publicly available reports of its integrated application as a distribution element within molecular sieve adsorbers.

[0005] Against this backdrop, there is an urgent need to explore the application potential of novel distribution structures in molecular sieve adsorbers. Utilizing the low resistance and high flux characteristics of Johnson nets, it is expected that a uniform airflow distribution within the adsorber can be achieved while significantly reducing the system pressure drop, thus providing a new technical path for optimizing the performance of molecular sieve adsorbers. Utility Model Content

[0006] This invention aims to provide a molecular sieve adsorber bed structure based on Johnson nets, solving the technical problems in the prior art such as localized adsorbent failure due to uneven gas distribution, complex structure and high pressure drop of traditional distributors, and low regeneration efficiency.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A molecular sieve adsorber bed structure based on a Johnson mesh includes a cylindrical body and an adsorbent bed disposed within the cylindrical body; a Johnson mesh is disposed below the adsorbent bed, and the Johnson mesh is pressed and fixed from bottom to top by ribs and pressure plates; the adsorbent fills the space in the cylindrical body above the Johnson mesh, so that the gas flow path passes through the ribs, pressure plates, and Johnson mesh from bottom to top, and then uniformly penetrates the adsorbent bed.

[0008] Furthermore, the mesh size of the Johnson mesh is 0.5 to 1.2 times the diameter of the adsorbent particles.

[0009] Furthermore, the Johnson mesh is made of wedge-shaped wires, forming a slit structure that is narrow at the top and wide at the bottom.

[0010] Furthermore, a gap of 0.2 to 2 mm is reserved between the Johnson mesh and the adsorbent bed.

[0011] Furthermore, the gap is 0.5 to 1 mm.

[0012] Furthermore, the Johnson net has a double-layer structure, and the laying angle between the two Johnson nets is 30° to 60°.

[0013] Furthermore, the Johnson mesh is made of 304 stainless steel.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: By employing Johnson mesh as a gas distributor and an internal support structure for the bed, this invention achieves the following significant benefits: First, the high porosity and unique wedge-shaped wire structure of the Johnson mesh increase the effective flow area by 30%-50% compared to traditional woven meshes, significantly reducing system pressure drop and improving gas distribution uniformity by 15%-20%. Second, the matching design between the mesh size and the molecular sieve particles achieves uniform support for the adsorbent particles, effectively preventing channeling and local short-circuiting. Third, the optimized design of the 0.5-1mm gap between the Johnson mesh and the adsorbent layer, combined with the countercurrent regeneration process, significantly improves desorption efficiency and reduces regeneration energy consumption by more than 8%. Fourth, the wedge-shaped wire's narrow top and wide bottom self-cleaning structure effectively reduces particle blockage and improves the long-term operational stability of the equipment. This ingenious structural design is simple to implement and comprehensively improves the technical and economic performance of the molecular sieve adsorber. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the molecular sieve adsorber bed structure based on Johnson net according to this utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The present invention will be further described in detail below with reference to the embodiments. Example

[0018] like Figure 1 As shown, this utility model discloses a molecular sieve adsorber bed structure based on Johnson mesh. The adsorber is a vertical pressure vessel with a cylinder 1 having a diameter of 3.2 meters and a height of 5.5 meters. The adsorbent 2 uses 13X type molecular sieves with a particle diameter of 3.6-4.8 mm. A 304 stainless steel Johnson mesh 5 is installed below the adsorbent 2 bed as the main distributor. This Johnson mesh 5 is made of V-shaped wedge wire wound and welded, with a gap width of 0.3 mm, forming a self-cleaning structure that is narrower at the top and wider at the bottom. The mesh size is 1.0 mm, increasing the effective flow area by 40% compared to traditional woven mesh. A uniform gap of 0.8 mm is reserved between the Johnson mesh 5 and the adsorbent 2 bed above, and reliable fixation is achieved through the bottom stiffeners 3 and pressure plates 4.

[0019] During operation, the raw air enters from the bottom of the adsorber, passes through Johnson's mesh 5, is evenly distributed, and then penetrates upwards through the molecular sieve bed to adsorb moisture and carbon dioxide. The regeneration stage employs a counter-current regeneration process, with high-temperature regeneration gas entering from the top, utilizing the gap between Johnson's mesh 5 and the adsorbent layer 2 to form a smooth desorption channel. Actual operating data shows that this structure increases carbon dioxide adsorption capacity by 12%, reduces regeneration energy consumption by 8%, and improves airflow distribution uniformity by more than 15%. Example

[0020] Based on Example 1, this example of Johnson net 5 adopts a double-layer structure, with the two layers laid at a 45° angle. This design effectively breaks up the channel flow through internal support and redistribution, prevents the adsorbent 2 from migrating and compacting, and ensures that the airflow remains uniform in the depth direction of the bed, further improving the purification effect and operational stability. Example

[0021] This embodiment focuses on optimizing regeneration performance. The gap between the Johnson mesh 5 and the adsorbent layer 2 is controlled at 0.5 mm, and 316L stainless steel is used to enhance corrosion resistance. By precisely controlling the gap size and coordinating it with the countercurrent regeneration process, the desorption efficiency is improved by more than 15%. This structure is particularly suitable for handling high-humidity gases, significantly improving regeneration efficiency and equipment reliability while maintaining low pressure drop.

[0022] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bed structure for a molecular sieve adsorber based on the Johnson net, characterized in that: The device includes a cylindrical body and an adsorbent bed disposed within the cylindrical body; a Johnson mesh is disposed below the adsorbent bed, and the Johnson mesh is pressed and fixed from bottom to top by ribs and pressure plates; the adsorbent fills the cylindrical space above the Johnson mesh, so that the gas flow path passes through the ribs, pressure plates and Johnson mesh from bottom to top and then evenly penetrates the adsorbent bed.

2. A bed structure for a molecular sieve adsorber based on the Johnson web according to claim 1, characterized in that: The Johnson mesh has a mesh size of 0.5 to 1.2 times the diameter of the adsorbent particles.

3. A bed structure for a molecular sieve adsorber based on the Johnson web according to claim 2, characterized in that: The Johnson mesh is made of wedge-shaped wires, forming a slit structure that is narrow at the top and wide at the bottom.

4. A bed structure for a molecular sieve adsorber based on the Johnson web according to claim 3, characterized in that: A gap of 0.2 to 2 mm is reserved between the Johnson mesh and the adsorbent bed.

5. A bed structure for a molecular sieve adsorber based on the Johnson web according to claim 4, characterized in that: The gap is 0.5 to 1 mm.

6. A bed structure for a molecular sieve adsorber based on the Johnson web according to claim 5, characterized in that: The Johnson net has a double-layer structure, and the laying angle between the two Johnson nets is 30° to 60°.

7. A bed structure for a molecular sieve adsorber based on the Johnson web according to claim 6, characterized in that: The Johnson mesh is made of 304 stainless steel.

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