Multi-layer sieve plate mechanism for grain drying and preheating fluidized bed
By designing a multi-layer sieve plate mechanism, the problem of incomplete preheating caused by a single sieve plate angle in the fluidized bed is solved, achieving stable preheating and sufficient heat exchange of the grain, and improving the grain drying quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU XINGTAI THERMAL POWER CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-22
Smart Images
Figure CN224266635U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to grain pre-drying, and more particularly to a multi-layer sieve plate mechanism for preheating fluidized beds for grain drying. Background Technology
[0002] During the grain drying process, the preheating temperature required for the grain varies from the inside to the outside. The screen plate angle in a normal fluidized bed is set in a single way, which leads to incomplete preheating and drying or excessive drying intensity, resulting in a large moisture gradient and temperature stress. This causes tensile stress on the surface and compressive stress inside the grain, which cannot fully guarantee the heat exchange of the grain, causing grain cracks or affecting the taste. Summary of the Invention
[0003] To solve the above problems, this utility model relates to a multi-layer sieve plate mechanism for a fluidized bed for grain drying and preheating. By setting the angle between the upper sieve plate, the sliding plate and the lower sieve plate, sufficient heat exchange between the grain and the hot air is ensured. The angle setting generates a forward throwing force on the grain and ensures that the grain moves forward in a regular and orderly manner, thus ensuring the stability of grain preheating.
[0004] A multi-layer sieve plate mechanism for a preheating fluidized bed for grain drying comprises an upper sieve plate, a sliding plate, and a lower sieve plate arranged sequentially from top to bottom within a preheating chamber. An air-sweeping box is located above the sliding plate. The upper sieve plate is inclinedly positioned at the top of the upper air box, and the lower sieve plate is inclinedly positioned at the top of the lower air box. The sliding plate is inclinedly positioned within the preheating chamber. A perforated air chamber is located at the bottom of the air-sweeping box. The perforated air chamber is parallel to the sliding plate. Several air outlets are evenly distributed on the surface of the perforated air chamber, and each air outlet is connected to a blower pipe.
[0005] Furthermore, the upper sieve plate has an inclination angle of 6°.
[0006] Furthermore, the tilt angle of the sliding plate is 8°.
[0007] Furthermore, the lower sieve plate has an inclination angle of 6°.
[0008] Furthermore, each of the blowpipes has several air outlets at its bottom; and several blow holes are provided on the side of the blowpipe facing the inclined direction of the sliding plate.
[0009] Furthermore, both the upper and lower sieve plates are alternately perforated, with perforation rates alternating at 10%, 19%, and 10%, and all perforations having a diameter of 3mm. By alternating the perforations with different ventilation rates, a spray zone and a fluidization zone are formed on the sieve plate, creating a pulsating effect. This ensures that the grains fluidize in a suspended state, undergoing parabolic motion, and achieves sufficient heat exchange.
[0010] Furthermore, the upper air box, the air-swept box, and the lower air box are all connected to the air collection box; one end of the air collection box is connected to the fluidizing air system.
[0011] When this utility model is in operation:
[0012] 1. By setting the angle between the upper screen plate, the sliding plate and the lower screen plate, the grain is ensured to have sufficient heat exchange with the hot air. The angle setting generates a forward throwing force on the grain and ensures that the grain moves forward in a regular and orderly manner.
[0013] 2. Grains requiring preheating are fed into the preheating box, then pass sequentially through the upper sieve plate, the sliding plate, and the lower sieve plate, carrying away any released water molecules. The fluidizing air system uses a fan to send hot air from the heater into the air distribution box, which then distributes the hot air to the upper air box, the air sweeping box, and the lower air box. The hot air in the upper air box preheats the grains through the upper sieve plate. The air sweeping box sends the hot air into the corresponding blowpipes, allowing hot air to exit in the lower and sliding directions, drying the grains on the sliding plate. From the lower sieve plate on the sliding plate track, the hot air in the lower air box exits through the sieve holes for preheating. Finally, the grains are sent to the subsequent processing section through the discharge port assembly.
[0014] 3. By alternating the setting of sieve holes with different ventilation rates, a spray zone and a fluidization zone are formed on the sieve plate, generating a pulsating effect.
[0015] The beneficial effects of this utility model are as follows: by setting the angle between the upper screen plate, the sliding plate and the lower screen plate, the grain is ensured to have sufficient heat exchange with the hot air. Due to the angle setting, the grain is generated with a forward throwing force and the grain is ensured to move forward in a regular and orderly manner; thus ensuring the stability of grain preheating. Attached Figure Description
[0016] Figure 1 A schematic diagram of the structure of this utility model;
[0017] Figure 2 A schematic diagram of the structure of the sliding plate and the air-swept box;
[0018] Figure 3 Schematic diagram of the blowpipe structure;
[0019] Figure 4 , Figure 3 Top view;
[0020] Figure 5 A schematic diagram showing the connection between the lower sieve plate and the lower air box;
[0021] Figure 6 Top view of the lower sieve plate.
[0022] List of reference numerals in the attached diagram:
[0023] Wherein: 1-Upper screen plate; 2-Sliding plate; 3-Lower screen plate; 5-Upper air box; 6-Lower air box; 7-Air sweeping box; 8-Preheating box; 9-Air chamber plate; 10-Pulse pipe; 11-Air outlet; 12-Air collection box; 14-Pulse hole. Detailed Implementation
[0024] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.
[0025] like Figure 1-6 As shown, a multi-layer sieve plate mechanism for a preheating fluidized bed for grain drying comprises, in the preheating chamber, an upper sieve plate 1, a sliding plate 2, and a lower sieve plate 3 arranged sequentially from top to bottom; an air sweeping box 7 is located above the sliding plate 2; the upper sieve plate 1 is inclinedly positioned on top of the upper air box 5; the lower sieve plate 3 is inclinedly positioned on top of the lower air box 6; the sliding plate 2 is inclinedly positioned within the preheating chamber 8; a perforated air chamber 9 is located at the bottom of the air sweeping box 7; the perforated air chamber 9 is parallel to the sliding plate 2; the upper air box 5, the air sweeping box 7, and the lower air box 6 are all connected to an air collecting box 12; one end of the air collecting box 12 is connected to the fluidizing air system (external end of the equipment, attached). Figure 1 (Not shown) Connection.
[0026] The surface of the air chamber plate 9 is uniformly provided with a number of air outlets; each air outlet is connected to a blow pipe 10; the bottom of each blow pipe 10 is provided with a number of air outlet holes 11; the side of the blow pipe 10 facing the inclined direction of the sliding plate 2 is provided with a number of blow holes 14.
[0027] The upper screen plate 1 has an inclination angle of 6º; the sliding plate 2 has an inclination angle of 8º; and the lower screen plate 3 has an inclination angle of 6º.
[0028] Both the upper sieve plate 1 and the lower sieve plate 3 have holes spaced apart in sequence, with the opening rates set alternately at 10%, 19%, and 10%, and the hole diameter is 3mm.
[0029] In this embodiment, the grains requiring preheating are fed into the preheating box 8, and then pass sequentially through the upper sieve plate 1, the sliding plate 2, and the lower sieve plate 3, carrying away any free water molecules. The fluidized air system sends the hot air from the heater into the air collection box 12 via a fan, and then the hot air is delivered to the upper air box 5, the air sweeping box 7, and the lower air box 6. The hot air in the upper air box 5 preheats the grains by passing through the upper sieve plate, and the air sweeping box 7 sends the hot air into the corresponding blowpipe 10, where it exits in the lower and sliding directions to dry the grains located on the sliding plate 2. The hot air from the lower air box exits through the sieve holes on the sliding plate 2 onto the lower sieve plate 3 for preheating. Finally, the grains are sent to the subsequent processing section through the discharge port assembly.
[0030] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.
Claims
1. A multi-layer sieve plate mechanism for preheating fluidized beds in grain drying, characterized in that: Inside the preheating box, an upper screen plate (1), a sliding plate (2), and a lower screen plate (3) are arranged sequentially from top to bottom; an air sweeping box (7) is arranged above the sliding plate (2); the upper screen plate (1) is inclinedly arranged on the top of the upper air box (5); the lower screen plate (3) is inclinedly arranged on the top of the lower air box (6); the sliding plate (2) is inclinedly arranged inside the preheating box (8); the bottom of the air sweeping box (7) is provided with an air chamber plate (9); the air chamber plate (9) is parallel to the sliding plate (2); the surface of the air chamber plate (9) is evenly provided with several air outlets; each air outlet is connected to a blower pipe (10).
2. The multi-layer sieve plate mechanism for preheating fluidized bed for grain drying according to claim 1, characterized in that: The upper sieve plate (1) has an inclination angle of 6º.
3. The multi-layer sieve plate mechanism for preheating fluidized bed for grain drying according to claim 1, characterized in that: The tilt angle of the sliding plate (2) is 8º.
4. The multi-layer sieve plate mechanism for preheating fluidized bed for grain drying according to claim 1, characterized in that: The lower sieve plate (3) has an inclination angle of 6º.
5. The multi-layer sieve plate mechanism for preheating fluidized bed for grain drying according to claim 1, characterized in that: Each of the blowpipes (10) has several air outlets (11) at its bottom; the blowpipes (10) have several blow holes (14) on the side facing the inclined direction of the sliding plate (2).
6. The multi-layer sieve plate mechanism for preheating fluidized bed for grain drying according to claim 1, characterized in that: The upper sieve plate (1) and the lower sieve plate (3) are both perforated at intervals, with the perforation rate set alternately at 10%, 19%, and 10%, and the hole diameter is 3mm.
7. The multi-layer sieve plate mechanism for preheating fluidized bed for grain drying according to claim 1, characterized in that: The upper air box (5), the air sweep box (7) and the lower air box (6) are all connected to the air collection box (12).