pressure jet drier

Abstract

The utility model discloses a pressure type spray drier. The drier comprises a tower body which is composed of a straight cylinder section at the upper part and a conical head at the lower part. The tower body top is provided with a hot air pipe; the straight cylinder section upper part cylinder wall is provided with a wall cyclone pipe which is accessed in a tangent direction and is inclined downward; the straight cylinder section lower end center is provided with an atomizing nozzle which sprays upward; the conical head is provided with a waste gas pipe which extends into the center. The utility model prolongs the material residence time by the atomizing nozzle which sprays upward and the top hot air forming countercurrent contact, and promotes sufficient drying. At the same time, the low-temperature rotating airflow which is introduced by the wall cyclone pipe forms a cooling air curtain on the tower wall, effectively isolates and sweeps the possible adhered undried powder particles, thereby cooperatively solves the wall sticking problem in the drying process of thermoplastic materials such as collagen, and improves the product quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, specifically to a pressure spray dryer. Background Technology

[0002] Collagen and its hydrolysates are important biopolymers with wide applications in food, pharmaceuticals, and cosmetics. However, these substances typically exhibit strong hygroscopicity and thermoplasticity, posing significant challenges to the drying process during production. In traditional pressure spray drying, moisture-rich materials are atomized by an atomizer and then come into contact with high-temperature hot air, causing the moisture to evaporate rapidly. However, in the initial drying stage, if incompletely dried powder particles come into contact with the high-temperature inner wall of the drying tower, they will soften and melt due to the heat, thus adhering to the tower wall.

[0003] This wall-sticking phenomenon causes a series of problems: First, the adhered material accumulates, reducing the effective drying volume and decreasing thermal efficiency; second, if the adhered material is heated for a long time, it may char or denature, affecting the quality and color of the final product; third, severe wall sticking requires frequent shutdowns for cleaning, which is not only labor-intensive but also reduces the equipment's production efficiency and continuity. Furthermore, the material adhering to the wall may detach and mix into the finished product, causing product contamination and reduced particle uniformity.

[0004] In existing technologies, methods such as jacket cooling, vibration or tapping of the tower wall, or the installation of wall-sweeping devices are commonly used to solve the problem of wall adhesion. However, these methods have limitations: jacket cooling requires a cooling water system; mechanical vibration or tapping is not effective for molten adhesion; and wall-sweeping devices have complex structures and are difficult to apply in a sterile environment.

[0005] Therefore, there is an urgent need for a new type of pressure spray dryer with a reasonable structural design that can effectively prevent thermoplastic materials from sticking to the wall and improve product quality and production efficiency. Utility Model Content

[0006] To prevent thermoplastic materials from sticking to the wall, this invention provides a pressure spray dryer.

[0007] The technical solution adopted in this utility model is as follows: A pressure spray dryer includes: a tower body, which is composed of an upper straight cylindrical section and a lower conical head; a hot air pipe, which is arranged at the top of the tower body and whose inlet is connected to the tower body vertically; a wall cyclone pipe, which is arranged on the upper wall of the straight cylindrical section and whose inlet is connected to the tower body obliquely downward in a tangential direction; an atomizing nozzle, which is arranged at the center of the lower end of the straight cylindrical section and sprays upward; a material pipe, which is connected to the atomizing nozzle and is used for supplying liquid; an exhaust gas pipe, which is arranged at the conical head and extends to the internal center of the conical head of the tower; and a finished product outlet pipe, which is arranged at the bottom of the conical head.

[0008] Preferably, a hot air distributor is provided at the inlet of the hot air duct that connects to the tower body, and the hot air distributor is a fan-shaped structure with several arched blades.

[0009] Preferably, the straight section is further provided with at least one sight glass and at least one vertical manhole cover.

[0010] Preferably, both the straight section and the conical head are provided with jackets on their exteriors.

[0011] Preferably, the material pipe is equipped with a support assembly, which includes a channel steel and diagonal bracing rods. The channel steel is horizontally installed inside the tower body with its opening facing upwards, and the diagonal bracing rods are supported between the channel steel and the conical end cap.

[0012] Preferably, the inlet air temperature of the wall cyclone duct is lower than the inlet air temperature of the hot air duct.

[0013] Preferably, the outlet of the exhaust pipe extending into the tower body is a downward-sloping opening.

[0014] This utility model has the following beneficial effects: 1. Synergistic Anti-sticking to the wall: The atomizing nozzles spray upwards, creating a counter-current contact with the downward-flowing hot air from the top. This prolongs the residence time of the droplets within the tower, ensuring thorough drying and reducing the generation of semi-dry particles at the source. The wall-mounted cyclone pipes deliver a slightly cooler rotating airflow diagonally downwards from the tangential direction, forming a continuously rotating "cold air protective curtain" on the inner wall of the straight section. This air curtain effectively isolates the high-temperature tower wall from the undried powder particles, while simultaneously applying a downward shear force to particles that may approach the wall, "blowing" them back to the core drying zone for continued drying, thus preventing the material from softening and adhering to the wall of the straight section. 2. Improved drying: The top hot air distributor uses its arched blades to evenly distribute the incoming hot air, avoiding local eddies and high-speed airflow that would directly carry wet material to the wall. The upward-spraying atomization, together with the top hot air and the wall cyclone blowing air, form a stable and efficient composite flow field, ensuring uniform and sufficient heat and mass transfer. 3. Prevent dust escape: The inlet of the exhaust pipe into the tower is designed to be angled downwards, which avoids the formation of vortices at the outlet that would entrain the dried light powder into the exhaust pipe, thus reducing product loss and preventing powder from adhering to the inlet. 4. Stable structure: The material tube is internally supported by a bracket assembly composed of channel steel and diagonal braces, which is structurally stable and can withstand the reaction force and vibration when the nozzle is working, ensuring the stability of the atomization process. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model.

[0016] Figure 2 This is a top view schematic diagram of an embodiment of the present utility model.

[0017] Figure 3 This is a schematic diagram of the hot air distributor in an embodiment of this utility model.

[0018] Figure 4 This is a front view schematic diagram of the bracket assembly in an embodiment of this utility model.

[0019] Figure 5 This is a right view of the bracket assembly in an embodiment of this utility model.

[0020] 1-Tower body, 1.1-Straight cylindrical section, 1.2-Conical head; 2-Hot air duct; 3-Wall-mounted cyclone duct; 4-Atomizing nozzle; 5-Material pipe; 6-Exhaust pipe; 7-Finished product outlet pipe; 8-Hot air distributor, 8.1-Arched blades; 9-Sight mirror; 10 - Vertical lifting manhole cover; 11-Cladle; 12-Support assembly, 12.1-Channel steel, 12.2-Diagonal brace. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0022] In the embodiments, such as Figures 1-5The diagram shows a pressure spray dryer, comprising: a tower body 1, consisting of an upper straight cylindrical section 1.1 and a lower conical head 1.2; a hot air duct 2, located at the top of the tower body 1, with its inlet vertically connected to the tower body 1; a wall cyclone duct 3, located on the upper wall of the straight cylindrical section 1.1, with its inlet tangentially connected to the tower body 1 at an angle downwards; an atomizing nozzle 4, located at the center of the lower end of the straight cylindrical section 1.1, spraying upwards; a material pipe 5, connected to the atomizing nozzle 4, for supplying liquid; an exhaust gas pipe 6, located at the conical head 1.2 and extending to the internal center of the conical head 1.2; and a finished product outlet pipe 7, located at the bottom of the conical head 1.2. This invention, through the coordinated layout of the tower body 1, hot air duct 2, wall cyclone duct 3, atomizing nozzle 4, material pipe 5, exhaust gas pipe 6, and finished product outlet pipe 7, constructs a highly efficient anti-sticking drying system. The atomizing nozzle 4 sprays upwards, creating a counter-current between the droplets and the downward-flowing hot air from the top. This prolongs the droplets' trajectory and residence time within the tower, ensuring sufficient evaporation of moisture and reducing the amount of semi-dry powder sticking to the walls due to incomplete drying. Simultaneously, the wall-mounted cyclone pipe 3, through its unique air intake method, forms a uniform, stable, and downward-rotating low-temperature airflow protective curtain on the inner wall of the straight section 1.1. This air curtain has a dual function: firstly, it cools and isolates the tower wall, preventing undried powder particles from softening upon contact with the high-temperature wall surface; secondly, it applies a downward tangential force to particles near the wall, blowing them away and returning them to the core drying area, thus fundamentally solving the problem of wall adhesion in the straight section 1.1. The exhaust pipe 6 extends into the center of the conical head 1.2, facilitating the smooth discharge of exhaust gas and preventing the formation of vortices at the bottom of the cone that carry away product.

[0023] In the embodiments, such as Figure 1 , Figure 3 As shown, a hot air distributor 8 is installed at the inlet of the hot air duct 2 connecting to the tower body 1. The hot air distributor 8 is a fan-shaped structure with several arched blades 8.1, which are made of PTFE material. The fan-shaped hot air distributor 8 with several arched blades at the outlet of the hot air duct 2 disperses and evenly distributes the high-temperature hot air entering the tower body 1, preventing the formation of concentrated high-speed airflow columns. This evenly distributed hot air field ensures more thorough and uniform heat and mass exchange with the atomized droplets, preventing the wet droplets from being directly blown onto the tower wall due to excessively strong local airflow, thereby further reducing the risk of wall adhesion and improving overall drying efficiency and product quality consistency.

[0024] In the embodiments, such as Figure 1 , Figure 2As shown, the straight section 1.1 is also equipped with at least one sight glass 9 and at least one vertical manhole 10. The sight glass 9 and the vertical manhole 10 facilitate the operation and maintenance of the equipment. Operators can directly observe the drying conditions, atomization effect, and wall adhesion inside the tower through the sight glass 9, enabling visual operation. The vertical manhole 10 provides a spacious maintenance passage, facilitating personnel entry into the tower for thorough cleaning, maintenance, and component replacement, reducing equipment maintenance costs and downtime.

[0025] In the embodiments, such as Figure 1 As shown, both the straight section 1.1 and the conical head 1.2 are equipped with jackets 11. The jackets 11 can be filled with insulation material, or the tower wall temperature can be actively controlled by introducing cooling or insulation media into them, ensuring it remains below the material adhesion temperature. This, combined with the cold air protection curtain formed by the wall cyclone pipes 3, constitutes a double anti-sticking protection, which is highly effective for extremely viscous materials.

[0026] In the embodiments, such as Figure 4 , Figure 5 As shown, the material pipe 5 is equipped with a support assembly 12, which includes a channel steel 12.1 and a diagonal brace 12.2. The channel steel 12.1 is horizontally installed inside the tower body 1 with its opening facing upwards, and the diagonal brace 12.2 is supported between the channel steel 12.1 and the conical end cap 1.2. The diagonal brace 12.2 forms a robust triangular support structure, providing good support for the material pipe 5 placed inside the channel steel 12.1 and enhancing the stability of the atomizing nozzle 4 during operation. This structure effectively resists the reaction force and vibration generated by the atomizing nozzle 4 during operation, preventing the material pipe 5 from shaking, thereby ensuring the stability of the atomization process and the uniformity of the atomization effect, and avoiding increased wall adhesion due to unstable spray trajectory caused by nozzle vibration.

[0027] In this embodiment, the inlet air temperature of the wall cyclone duct 3 is lower than that of the hot air duct 2. The slightly lower temperature of the wall cyclone creates a localized low-temperature zone at the tower wall. When powder particles approach the tower wall, they come into contact with the lower-temperature airflow and wall surface, rather than the high-temperature hot air. This reduces the possibility of the powder particles softening and melting due to heat, ensuring the protective effect of the purging airflow. For collagen and its hydrolysates, the inlet air temperature of the hot air duct 2 is controlled within the range of 140-180℃. If it exceeds 190℃, it will cause collagen molecular chains to break, denature and become inactive, resulting in a burnt yellow product color. If it is below 130℃, the evaporation rate is too slow, and the droplets cannot form a sufficiently strong solid shell before contacting the wall surface, which will increase the risk of wall adhesion. The inlet air temperature of the wall cyclone duct 3 is controlled within the range of 50-80℃. If it exceeds 90℃, its cooling protection effect disappears, and it cannot prevent the powder particles from softening. If it is below 40℃, it may cause the tower wall temperature to drop below the dew point, causing wet materials to condense on the wall, resulting in more serious "wet adhesion". The main hot air temperature of 160℃ combined with the wall cyclone temperature of 60℃ creates a temperature difference of 100℃, which is an ideal drying and protective environment.

[0028] In the embodiments, such as Figure 1 As shown, the outlet of the exhaust pipe 6 that extends into the tower body 1 is a downward-sloping opening. This structure can prevent the formation of an upward vortex at the exhaust pipe outlet, thereby preventing the dried, lightweight finished powder from being entrained by the exhaust gas and escaping. This reduces product loss, increases yield, and also prevents powder from adhering and accumulating at the pipe outlet.

[0029] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A pressure spray dryer, characterized in that, include: The tower body (1) consists of a straight cylindrical section (1.1) at the top and a conical head (1.2) at the bottom; Hot air duct (2) is arranged at the top of the tower body (1), and its opening is connected to the tower body (1) in a vertical direction. A wall cyclone pipe (3) is arranged on the upper part of the straight section (1.1) of the cylinder wall, and its opening is connected to the tower body (1) at an angle downward in the tangential direction. Atomizing nozzle (4) is arranged at the center of the lower end of the straight section (1.1) and sprays upwards; The material pipe (5) is connected to the atomizing nozzle (4) and is used for liquid supply; The exhaust pipe (6) is arranged in the conical head (1.2) and extends to the center of the conical head (1.2) of the tower; The finished product outlet pipe (7) is arranged at the bottom of the conical head (1.2).

2. The pressure spray dryer according to claim 1, characterized in that, A hot air distributor (8) is provided at the pipe opening where the hot air pipe (2) connects to the tower body (1). The hot air distributor (8) is a fan-shaped structure with several arched blades (8.1).

3. The pressure spray dryer according to claim 1, characterized in that, The straight section (1.1) is also provided with at least one sight glass (9) and at least one vertical hanging manhole (10).

4. The pressure spray dryer according to claim 1, characterized in that, Both the straight section (1.1) and the conical end cap (1.2) are provided with jackets (11).

5. The pressure spray dryer according to claim 1, characterized in that, The material pipe (5) is equipped with a support assembly (12), which includes a channel steel (12.1) and a diagonal brace (12.2). The channel steel (12.1) is installed horizontally inside the tower body (1) with its opening facing upwards, and the diagonal brace (12.2) is supported between the channel steel (12.1) and the conical end cap (1.2).

6. The pressure spray dryer according to claim 1, characterized in that, The inlet temperature of the wall cyclone pipe (3) is lower than the inlet temperature of the hot air pipe (2).

7. The pressure spray dryer according to claim 1, characterized in that, The exhaust pipe (6) has a downward-sloping opening that extends into the tower body (1).

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