Adsorption column dead space purging air dryer

Abstract

The utility model relates to a kind of adsorption tower dead zone purging type air dryer, belong to air dryer technical field, including first adsorption tower and the second adsorption tower being set to the side of first adsorption tower, the inside of first adsorption tower and second adsorption tower is fixedly connected with adsorbent bed, main gas flow system is provided on the first adsorption tower, the inside of first adsorption tower is provided with dead zone purging component.The adsorption tower dead zone purging type air dryer, by setting independent dead zone purging component, in regeneration stage, by first auxiliary purging head and second auxiliary purging head directly to the dead zone that traditional main gas flow is difficult to cover such as tower top head and bed layer edge injection purging gas flow, the full regeneration of adsorbent bed is realized, which effectively solves the problem that adsorbent in dead zone is saturated and fails in advance due to insufficient regeneration, improves the overall utilization of adsorbent, prolongs its service life, and reduces the dew point of dry air.

Description

Technical Field

[0001] This utility model relates to the field of air dryer technology, specifically to an adsorption tower dead zone purging type air dryer. Background Technology

[0002] An air dryer is a device that removes moisture from the air and reduces air humidity through physical or chemical methods. Its core function is to provide dry and clean air for specific scenarios, preventing equipment failure, product deterioration, or environmental problems caused by moisture. The adsorption tower dead zone purge air dryer is a high-end model developed to address the reduced dehumidification efficiency caused by the "dead zone" (area that airflow cannot reach) within the adsorption tower of traditional adsorption dryers.

[0003] Chinese utility model patent CN222368730U discloses a dual-tower adsorption air dryer, comprising: tower A and tower B, connected by an upper connecting pipe and a lower connecting pipe. Tower A has an internal spiral mechanism. Compressed air input into tower A through the lower connecting pipe flows upwards, passing through a filter plate and entering the spiral plate. Guided by the spiral plate, the compressed air rises in a spiral shape, during which moisture in the air is absorbed by the adsorbent. Compared to the guide plate in a comparative example, this device's spiral plate guides the compressed air in a spiral upward shape, further increasing the contact time between the compressed air and the adsorbent, thus improving the adsorption efficiency of the adsorbent.

[0004] However, during the use of this utility model, there are many areas in the adsorption tower that are difficult for the airflow to reach, and there is no structure in these areas that can be dried, which leads to a decrease in the utilization rate of the adsorbent in the adsorption tower and fails to meet the usage requirements. Therefore, an adsorption tower dead zone purging air dryer is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an adsorption tower dead zone purge air dryer, which has the advantage of conveniently drying the dead zone in the adsorption tower. It solves the problem that existing adsorption towers have many areas that are difficult for airflow to reach, and these areas do not have structures for drying, resulting in a decrease in the utilization rate of the adsorbent in the adsorption tower and failing to meet the usage requirements.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an adsorption tower dead zone purge type air dryer, comprising a first adsorption tower and a second adsorption tower disposed on one side of the first adsorption tower, wherein an adsorbent bed is fixedly connected inside both the first adsorption tower and the second adsorption tower, a main airflow system is provided on the first adsorption tower, and a dead zone purge assembly is provided inside the first adsorption tower.

[0007] The main airflow system includes a main air inlet and a main air outlet. The main air inlet is fixedly connected to the bottom of the front of the first adsorption tower, and the main air outlet is fixedly connected to the top of the first adsorption tower. A main airflow channel is formed between the main air inlet and the main air outlet, and the main airflow channel penetrates the adsorbent bed.

[0008] The dead zone purging assembly includes a purging airflow source, a first auxiliary purging head, a second auxiliary purging head, and a flow guiding structure. The purging airflow source is fixedly connected to the front of the first adsorption tower. The purging airflow source is connected to the first auxiliary purging head and the second auxiliary purging head by a delivery pipe. The first auxiliary purging head is fixedly connected to the inside of the top end cap of the first adsorption tower. The second auxiliary purging head is fixedly connected to the inner wall of the first adsorption tower near the edge of the adsorbent bed. The flow guiding structure is embedded inside the adsorbent bed.

[0009] Furthermore, the axes of the first auxiliary purge head and the second auxiliary purge head both point to the airflow dead zone inside the first adsorption tower, and the first auxiliary purge head is distributed in a ring along the inner wall of the first adsorption tower.

[0010] Furthermore, the second auxiliary purge head forms a 30° angle with the inner wall of the first adsorption tower, and a diffusion nozzle is fixedly connected to the outlet end of the second auxiliary purge head. The spray range of the diffusion nozzle covers the gap between the adsorbent bed and the first adsorption tower.

[0011] Furthermore, the flow guiding structure is a conical flow guide plate, with the tip of the flow guiding structure facing the main air inlet.

[0012] Furthermore, the outer surface of the flow guiding structure is provided with vent holes, and there are three flow guiding structures, with the vent holes in every two flow guiding structures being staggered.

[0013] Furthermore, the dead zone purging assembly also includes a flow regulating valve and a humidity sensor. The humidity sensor is fixedly connected to the inner wall of the dead zone of the airflow in the first adsorption tower, and the flow regulating valve is fixedly connected to the delivery pipeline. The flow regulating valve and the humidity sensor are connected electrically.

[0014] Furthermore, two connecting pipes are fixedly connected between the first adsorption tower and the second adsorption tower, and a switching valve is fixedly connected to each of the two connecting pipes. The switching valve is connected to the purge gas source.

[0015] Compared with the prior art, this utility model provides an adsorption tower dead zone purge type air dryer, which has the following beneficial effects:

[0016] 1. This adsorption tower dead zone purge air dryer, by setting up an independent dead zone purge component, injects purge airflow directly into the dead zone, such as the tower top end cap and bed edge, which is difficult to be covered by the traditional main airflow, through the first auxiliary purge head and the second auxiliary purge head during the regeneration stage. This achieves full-area regeneration of the adsorbent bed, which effectively solves the problem of premature saturation and failure of adsorbent in the dead zone due to insufficient regeneration. This improves the overall utilization rate of the adsorbent, extends its service life, and reduces the dew point of the dried air.

[0017] 2. This dead-zone purge air dryer for adsorption towers optimizes the airflow distribution of the main intake air by embedding a flow guiding structure inside the adsorbent bed. This allows the airflow to pass through the adsorbent bed more evenly, reducing the probability and extent of dead zones caused by airflow short-circuiting or sidewall effects. It solves the problem in existing adsorption towers where there are many areas that are difficult for the airflow to reach, and these areas lack a structure for drying, resulting in a decrease in the utilization rate of the adsorbent and failure to meet usage requirements. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention;

[0019] Figure 2 This is a perspective view of the first adsorption tower of this utility model;

[0020] Figure 3 This is a bottom-view perspective view of the airflow guiding structure of this utility model.

[0021] In the diagram: 1. First adsorption tower; 2. Second adsorption tower; 3. Main outlet; 4. Main inlet; 5. Purge gas source; 6. Delivery pipeline; 7. First auxiliary purge head; 8. Second auxiliary purge head; 9. Adsorbent bed; 10. Flow guiding structure; 11. Connecting pipeline; 12. Switching valve. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1 and Figure 2 This embodiment of an adsorption tower dead zone purge air dryer includes a first adsorption tower 1 and a second adsorption tower 2 disposed on one side of the first adsorption tower 1. Adsorbent beds 9 are fixedly connected inside both the first adsorption tower 1 and the second adsorption tower 2. A main airflow system is provided on the first adsorption tower 1. The main airflow system includes a main air inlet 4 and a main air outlet 3. The main air inlet 4 is fixedly connected to the bottom of the front of the first adsorption tower 1, and the main air outlet 3 is fixedly connected to the top of the first adsorption tower 1. A main airflow channel is formed between the main air inlet 4 and the main air outlet 3, and the main airflow channel penetrates the adsorbent bed 9.

[0024] Specifically, during the adsorption stage, humid air enters through the main inlet 4 and passes through the adsorbent bed 9 from bottom to top, where water molecules are captured by the adsorbent, and the dried air is discharged from the main outlet 3. During the regeneration stage, the process flow is reversed, and regeneration gas (such as heated dry gas) blows through the adsorbent bed 9 from top to bottom, desorbing the moisture from the adsorbent.

[0025] Please see Figures 1 to 3 In this embodiment, a dead zone purging assembly is provided inside the first adsorption tower 1. The dead zone purging assembly includes a purging airflow source 5, a first auxiliary purging head 7, a second auxiliary purging head 8, and a flow guiding structure 10. The purging airflow source 5 is fixedly connected to the front of the first adsorption tower 1. A conveying pipe 6 is fixedly connected between the purging airflow source 5 and the first auxiliary purging head 7 and the second auxiliary purging head 8, respectively. The first auxiliary purging head 7 is fixedly connected to the inner side of the top end cap of the first adsorption tower 1. The second auxiliary purging head 8 is fixedly connected to the inner wall of the first adsorption tower 1 near the edge of the adsorbent bed 9. The flow guiding structure 10 is embedded inside the adsorbent bed 9.

[0026] Specifically, the axes of the first auxiliary purge head 7 and the second auxiliary purge head 8 both point to the dead zone of the airflow inside the first adsorption tower 1. The first auxiliary purge head 7 is distributed in a ring along the inner wall of the first adsorption tower 1. The second auxiliary purge head 8 forms a 30° angle with the inner wall of the first adsorption tower 1. A diffusion nozzle is fixedly connected to the outlet end of the second auxiliary purge head 8. The spray range of the diffusion nozzle covers the gap between the adsorbent bed 9 and the first adsorption tower 1.

[0027] It should be noted that the flow guiding structure 10 is a conical flow guiding plate, with the cone tip of the flow guiding structure 10 facing the main air inlet 4. Ventilation holes are opened on the outer surface of the flow guiding structure 10. There are three flow guiding structures 10, and the ventilation holes in every two flow guiding structures 10 are staggered.

[0028] It should be noted that the dead zone purging assembly also includes a flow regulating valve and a humidity sensor. The humidity sensor is fixedly connected to the inner wall of the airflow dead zone in the first adsorption tower 1, and the flow regulating valve is fixedly connected to the delivery pipeline 6. The flow regulating valve and the humidity sensor are connected electrically.

[0029] It should be noted that the purge air source 5 is a hot air generation device, which includes a waste heat recovery heat exchanger. The waste heat recovery heat exchanger is connected to the exhaust pipe of an external air compressor and is used to heat the purge air using the heat of air compressor compression. The temperature of the heated purge air is 80-120℃.

[0030] Please see Figure 1 In this embodiment, two connecting pipes 11 are fixedly connected between the first adsorption tower 1 and the second adsorption tower 2. A switching valve 12 is fixedly connected to each of the two connecting pipes 11, and the switching valve 12 is connected to the purge airflow source 5.

[0031] Specifically, a purge gas source 5 can alternately provide purge gas to the first adsorption tower 1 and the second adsorption tower 2 through a switching valve 12 and a connecting pipe 11.

[0032] It should be noted that this integrated design makes full use of the characteristic of the two towers working alternately. When the first adsorption tower 1 is in the adsorption stage, a portion of the high-pressure dried finished gas produced by it can be used as the purge gas source 5 and delivered to the second adsorption tower 2, which is in the regeneration stage, through the switching valve 12. This realizes the internal recycling of energy, without the need for an external compressed gas source, which greatly improves the energy efficiency and economy of the entire system.

[0033] The working principle of the above embodiments is as follows:

[0034] When the dryer is working, the first adsorption tower 1 and the second adsorption tower 2 alternately perform adsorption and regeneration. Taking the regeneration of the first adsorption tower 1 as an example, the switching valve 12 is activated, connecting the purge air source 5 to the purge assembly of the first adsorption tower 1, and the main regeneration airflow purges the main bed layer from top to bottom. At the same time, the dead zone purge assembly is activated, and the first auxiliary purge head 7 injects dry gas into the dead zone at the top of the tower, dispersing and replacing the moisture in that area. The second auxiliary purge head 8 injects dry gas into the gaps at the edge of the bed, ensuring that the adsorbent on the side wall is fully regenerated. The flow guiding structure 10 ensures uniform airflow distribution at the inlet end, preventing the formation of dead zones.

[0035] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods, and any method that achieves the desired beneficial effect can be implemented. Furthermore, all electrical components in this embodiment are electrically connected to the main controller and power supply. The main controller can be a conventional, known device such as a computer that performs control functions. Those skilled in the art can control the electrical components through simple programming, and the existing disclosed power connection technologies are common knowledge in the field. Therefore, this embodiment will not elaborate further on their specific structural composition and working principles.

[0036] It should be noted that the orientations or positional relationships indicated herein are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of facilitating the description of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] 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. An adsorption tower dead zone purge type air dryer, comprising a first adsorption tower (1) and a second adsorption tower (2) disposed on one side of the first adsorption tower (1), characterized in that: The first adsorption tower (1) and the second adsorption tower (2) are both fixedly connected with adsorbent beds (9). The first adsorption tower (1) is equipped with a main airflow system and the first adsorption tower (1) is equipped with a dead zone purging assembly. The main airflow system includes a main air inlet (4) and a main air outlet (3). The main air inlet (4) is fixedly connected to the bottom of the front of the first adsorption tower (1), and the main air outlet (3) is fixedly connected to the top of the first adsorption tower (1). A main airflow channel is formed between the main air inlet (4) and the main air outlet (3), and the main airflow channel penetrates the adsorbent bed (9). The dead zone purging assembly includes a purging airflow source (5), a first auxiliary purging head (7), a second auxiliary purging head (8), and a flow guiding structure (10). The purging airflow source (5) is fixedly connected to the front of the first adsorption tower (1). The purging airflow source (5) is fixedly connected to the first auxiliary purging head (7) and the second auxiliary purging head (8) by a conveying pipe (6). The first auxiliary purging head (7) is fixedly connected to the inner side of the top end cap of the first adsorption tower (1). The second auxiliary purging head (8) is fixedly connected to the inner wall of the first adsorption tower (1) near the edge of the adsorbent bed (9). The flow guiding structure (10) is embedded in the interior of the adsorbent bed (9).

2. The adsorption tower dead zone purge type air dryer according to claim 1, characterized in that: The axes of the first auxiliary purge head (7) and the second auxiliary purge head (8) both point to the airflow dead zone inside the first adsorption tower (1), and the first auxiliary purge head (7) is distributed in a ring along the inner wall of the first adsorption tower (1).

3. The adsorption tower dead zone purge type air dryer according to claim 1, characterized in that: The second auxiliary purge head (8) forms a 30° angle with the inner wall of the first adsorption tower (1). A diffusion nozzle is fixedly connected to the outlet end of the second auxiliary purge head (8). The spray range of the diffusion nozzle covers the gap between the adsorbent bed (9) and the first adsorption tower (1).

4. The adsorption tower dead zone purge type air dryer according to claim 1, characterized in that: The flow guiding structure (10) is a conical flow guide plate, and the tip of the flow guiding structure (10) faces the main air inlet (4).

5. The adsorption tower dead zone purge type air dryer according to claim 1, characterized in that: The outer surface of the flow guiding structure (10) is provided with air vents. There are three flow guiding structures (10), and the air vents in every two flow guiding structures (10) are staggered.

6. The adsorption tower dead zone purge type air dryer according to claim 1, characterized in that: The dead zone purging assembly also includes a flow regulating valve and a humidity sensor. The humidity sensor is fixedly connected to the inner wall of the airflow dead zone in the first adsorption tower (1), and the flow regulating valve is fixedly connected to the conveying pipe (6). The flow regulating valve and the humidity sensor are connected electrically.

7. The adsorption tower dead zone purge type air dryer according to claim 1, characterized in that: Two connecting pipes (11) are fixedly connected between the first adsorption tower (1) and the second adsorption tower (2). A switching valve (12) is fixedly connected to each of the two connecting pipes (11), and the switching valve (12) is connected to the purge air source (5).

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