Aerodynamic anti-wall-sticking device for a dispersant spray drying tower

Abstract

The utility model relates to drying equipment technical field, concretely is a kind of dispersing agent spray drying tower's pneumatic anti-sticking wall device, solve the problem proposed in background art, it includes tower body, and tower body wall part is equipped with interlayer structure, and at least one annular air path pipe is contained in interlayer content.Numerous nozzles are installed on the annular air path pipe through support and tower body inner wall connection, and nozzle outlet end surface is flush with tower body inner wall surface, and it is sector nozzle, and its axis and tower wall tangent direction present acute angle.The device further includes the external gas source consisting of air compressor, gas storage tank and air drying purifier, and gas source is connected to each layer annular air path pipe through main gas supply pipe and independent vertical branch pipe, and pulse solenoid valve is equipped on each vertical branch pipe, and all pulse solenoid valves are independently controlled by PLC controller.The utility model can prevent and remove tower wall adhering material by jet tangential pulse air curtain, with good anti-sticking effect, not affect technology, can quantitative accurate control and the advantage of high degree of automation.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, specifically to a pneumatic anti-sticking device for a dispersant spray drying tower. Background Technology

[0002] Spray drying towers are essential equipment in industries such as chemical, food, and pharmaceutical for rapidly drying liquid materials into powder or granular products. During the drying process, atomized droplets are highly prone to adhesion when they come into contact with the cooler tower walls, a phenomenon known as "wall sticking."

[0003] Adhesion to the wall can cause a series of problems: First, the material adhering to the wall may coke or denature due to excessive heating, resulting in a decline in product quality; second, the accumulation of adhering material will reduce the effective drying area, reduce heat and mass transfer efficiency, and affect production capacity; finally, frequent shutdowns for cleaning are required, increasing maintenance costs and workload, and affecting continuous production.

[0004] Existing anti-adhesion technologies mainly include mechanical scraping and airflow purging. Mechanical scraping suffers from problems such as tower wall abrasion, the risk of metal contamination, and complex drive structures; while ordinary airflow purging often results in uneven airflow distribution, low energy utilization, and the purging device itself may become a new adhesion point, leading to unsatisfactory anti-adhesion effects. Therefore, there is an urgent need for a non-contact, efficient, reliable anti-adhesion device that does not affect the flow within the tower. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides the following technical solution: a pneumatic anti-sticking device for a dispersant spray drying tower, comprising a tower body, the wall of which is provided with a sandwich structure; the device includes at least one annular gas pipe housed within the sandwich structure, the annular gas pipe being connected to the tower body via a bracket; an installation hole communicating with the annular gas pipe is provided on the inner wall plate of the tower body; multiple nozzles are connected to the annular gas pipe, the nozzles being installed within the installation hole, and their outlet end faces being flush with the inner wall surface of the tower body; the nozzles are fan-shaped nozzles, the angle between their axes and the tangent direction of the inner wall surface of the tower body being an acute angle; the device further includes an external gas source and a control system for supplying gas to the annular gas pipe; the external gas source is connected to the annular gas pipe via a gas supply pipe penetrating the tower wall.

[0006] Furthermore, the annular gas path pipe is provided in two or more layers and distributed along the axial direction of the tower body; each layer of the annular gas path pipe is connected to a main gas supply pipe through an independent vertical branch pipe, and the main gas supply pipe is connected to the external gas source.

[0007] Furthermore, each of the independent vertical branches is equipped with a pulse solenoid valve for controlling the on / off state of the branch.

[0008] Furthermore, the control system includes a controller electrically connected to all the pulse solenoid valves; the controller is a programmable logic controller, which is signal-connected to all the pulse solenoid valves and is configured to independently control the opening and closing sequence, frequency and single opening duration of each pulse solenoid valve according to a preset program.

[0009] Furthermore, the external air source includes, in sequence, an air compressor, an air tank, and an air dryer / purifier.

[0010] Furthermore, the annular air passage pipe and nozzle are made of stainless steel or metal materials with anti-corrosion treatment on the surface.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The tangential high-speed air curtain ejected through the fan-shaped nozzles forms an isolation layer on the tower wall surface and generates a downward shearing force, effectively preventing material adhesion and removing any slight accumulations that have already adhered, achieving efficient anti-sticking and self-cleaning. The tower wall sandwich design, with the nozzle outlet face flush with the inner wall, ensures the smoothness and integrity of the inner wall, preventing the device itself from becoming a new adhesion point and minimizing interference with the core process flow field inside the tower. The independent air supply and layered control strategy, with precise PLC control of the opening and closing of pulse solenoid valves in each layer, enables differentiated and on-demand purging of different drying zones, maximizing energy savings while ensuring effectiveness. Attached Figure Description

[0013] 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:

[0014] Figure 1 This is a schematic diagram illustrating the application of the pneumatic anti-sticking device of this utility model in a spray drying tower;

[0015] Figure 2 This is a schematic diagram of the top cross-section of the tower wall described in this utility model;

[0016] Figure 3 This is a schematic diagram of the annular gas passage structure of this utility model;

[0017] Figure 4 This utility model Figure 2 A magnified view of a portion of point A in the middle.

[0018] In the diagram: 1. Annular air passage pipe; 2. Support frame; 3. Tower body; 4. Nozzle; 5. Pulse solenoid valve; 6. Controller; 7. Air compressor; 8. Air storage tank; 9. Air dryer and purifier; 10. Sandwich structure; 11. Main air supply pipe; 12. Vertical branch pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] This embodiment provides a pneumatic anti-sticking device for a dispersant spray drying tower. This device can effectively prevent materials from adhering to the drying tower wall in a non-contact manner, thereby ensuring product purity and improving drying efficiency.

[0022] Specifically, such as Figures 1 to 3 As shown, the pneumatic anti-adhesion device includes a tower body 3, an annular air pipe 1, a support 2, a nozzle 4, a pulse solenoid valve 5, a controller 6, an air compressor 7, an air storage tank 8, an air dryer and purifier 9, a sandwich structure 10, a main air supply pipe 11, and a vertical branch pipe 12.

[0023] The tower body 3 has a sandwich structure 10 on its wall. The annular air passage pipe 1 is housed within the sandwich structure 10 and is fixedly connected to the inner wall of the tower body 3 via a bracket 2. In this embodiment, two layers of annular air passage pipes 1 are arranged along the axial direction of the tower body 3, corresponding to the upper atomization area and the lower conical area of ​​the tower body 3, respectively, to provide all-round protection for parts that are prone to sticking to the wall at different heights.

[0024] The inner wall of the tower body 3 has mounting holes that connect to the annular gas passage pipe 1. The nozzle 4 is installed within these mounting holes, with its outlet face flush with the inner wall surface of the tower body 3. This crucial structure ensures the smooth integrity of the tower's inner wall, fundamentally preventing the device itself from becoming a new point of adhesion. The nozzle 4 is a fan-shaped nozzle, with its axis forming an acute angle α (e.g., 15° to 30°) with the tangent direction to the inner wall surface of the tower body 3. Figure 3 The diagram shows the airflow direction. This installation method allows the high-speed pulsed airflow to form a tangential, rotating downward "air curtain" along the surface of the tower wall. This air curtain can both form a gas isolation layer to prevent wet materials from adhering and generate downward shearing force on the powder that has already adhered, effectively "scraping" it clean.

[0025] The device also includes an external air source and control system for supplying air to the annular air circuit 1. The external air source includes, in sequence, an air compressor 7, an air tank 8, and an air dryer / purifier 9. The air compressor 7 is responsible for generating high-pressure air; the air tank 8 is used to stabilize air pressure, store energy, and ensure the instantaneous flow rate of pulse jet cleaning; the air dryer / purifier 9 is used to deeply remove moisture, oil, and dust impurities from the compressed air, providing clean and dry instrument air, which is a key guarantee to prevent nozzle 4 from clogging and to avoid contamination of high-purity dispersant products.

[0026] An external air source is connected to the annular air supply pipe 1 via a pipe that penetrates the tower wall. Specifically, the main air supply pipe 11 extends from the outlet of the air dryer / purifier 9. For each layer of the annular air supply pipe 1, an independent vertical branch pipe 12 is provided. One end of the vertical branch pipe 12 connects to the main air supply pipe 11, and the other end passes through the tower wall and connects to the corresponding annular air supply pipe 1. This "independent air supply" architecture ensures stable air pressure and prevents interference between layers of the annular air supply pipe 1, laying the foundation for precise layered control.

[0027] A pulse solenoid valve 5 is installed in series on each vertical branch pipe 12. All pulse solenoid valves 5 are electrically connected to a controller 6. The controller 6 is a programmable logic controller (PLC) configured to independently and precisely control the opening and closing sequence, blowing frequency (e.g., opening once every 20-60 seconds), and duration of each opening (e.g., 0.2-1.0 seconds per opening) of each pulse solenoid valve 5 according to a preset program. For example, the upper annular pipe can be set to intercept most of the droplets with a higher blowing frequency (e.g., blowing for 0.3 seconds every 30 seconds); the lower annular pipe can be set to clean the dried powder with a slightly higher blowing force (e.g., blowing for 0.5 seconds every 45 seconds). This layered independent control strategy allows for differentiated and on-demand treatment of the wall adhesion characteristics of different drying areas, ensuring optimal anti-sticking effect while maximizing energy savings.

[0028] Preferably, the annular gas pipe 1 and the nozzle 4 are made of stainless steel or metal materials with anti-corrosion treatment to withstand the high temperature and potentially corrosive environment inside the drying tower, ensuring long-term operation of the device.

[0029] The device operates as follows:

[0030] During normal operation of the spray drying tower, the controller 6 starts according to a preset program. When the spraying time of a certain layer of annular air passage 1 is reached, the controller 6 sends a brief opening signal to the corresponding pulse solenoid valve 5. The pulse solenoid valve 5 opens instantaneously, and clean, dry compressed air then enters the annular air passage 1 of that layer through the main air supply pipe 11 and the vertical branch pipe 12, and is finally pulsed out at high speed and in a concentrated manner from all the fan-shaped nozzles 4 of that layer. This tangential airflow forms a brief but powerful rotating air curtain on the tower wall surface, effectively removing materials adhering to the wall. After the pulse ends, the solenoid valve closes, and the system waits for the next cycle. This cycle repeats, achieving continuous, automatic, and efficient cleaning of the tower wall, and the entire process does not affect the normal drying process flow field inside the tower.

[0031] Example 2

[0032] This embodiment provides a spray drying tower, which includes the pneumatic anti-sticking device described in Embodiment 1.

[0033] Thanks to the aforementioned pneumatic anti-sticking device, this spray drying tower effectively prevents easily sticky materials such as dispersants from depositing and coking on the tower wall, ensuring uniform and stable product quality. Simultaneously, the device enables online cleaning without shutting down the machine, significantly reducing equipment maintenance frequency and downtime, and improving production efficiency and economic benefits.

[0034] 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 process, method, article, or apparatus.

[0035] 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 pneumatic anti-sticking device for a dispersant spray drying tower, comprising a tower body (3), characterized in that: The tower body (3) has a sandwich structure (10) on its wall; the device includes at least one annular gas pipe (1) housed in the sandwich structure (10), the annular gas pipe (1) being connected to the tower body (3) via a bracket (2); the inner wall of the tower body (3) has an installation hole communicating with the annular gas pipe (1); the annular gas pipe (1) is connected to a plurality of nozzles (4), the nozzles (4) being installed in the installation hole, and their outlet end face being flush with the inner wall surface of the tower body (3); the nozzles (4) are fan-shaped nozzles, and the angle between their axis and the tangent direction of the inner wall surface of the tower body (3) is an acute angle; the device also includes an external gas source and control system for supplying gas to the annular gas pipe (1); the external gas source is connected to the annular gas pipe (1) via a gas supply pipe penetrating the tower wall.

2. The pneumatic anti-sticking device for a dispersant spray drying tower according to claim 1, characterized in that: The annular gas pipe (1) is provided in two or more layers and is distributed along the axial direction of the tower body (3); each layer of the annular gas pipe (1) is connected to a main gas supply pipe (11) through an independent vertical branch pipe (12), and the main gas supply pipe (11) is connected to the external gas source.

3. The pneumatic anti-sticking device for a dispersant spray drying tower according to claim 2, characterized in that: Each of the independent vertical branch pipes (12) is equipped with a pulse solenoid valve (5) for controlling the opening and closing of the pipe.

4. The pneumatic anti-sticking device for a dispersant spray drying tower according to claim 3, characterized in that: The control system includes a controller (6) electrically connected to all the pulse solenoid valves (5); the controller (6) is a programmable logic controller, which is signal connected to all the pulse solenoid valves (5) and is configured to independently control the opening and closing sequence, frequency and single opening duration of each pulse solenoid valve (5) according to a preset program.

5. The pneumatic anti-sticking device for a dispersant spray drying tower according to claim 1, characterized in that: The external air source includes, in sequence, an air compressor (7), an air storage tank (8), and an air dryer / purifier (9).

6. The pneumatic anti-sticking device for a dispersant spray drying tower according to claim 1, characterized in that: The annular air passage (1) and the nozzle (4) are made of stainless steel or metal materials with anti-corrosion treatment.

Images