Flow guide device for air inlet channel of fluidized bed

Abstract

The utility model discloses a fluidized bed air inlet channel guiding device which comprises a bottom cylinder, an air flow distribution plate, a square pipe and a square connection round pipe, a plurality of guiding plates which are vertically and evenly distributed are arranged in the square pipe, the front side end face and the rear side end face of each guiding plate are fixedly connected with the front inner side wall and the rear inner side wall of the square pipe in a sealed mode respectively, and the right end face of each guiding plate is flush with the right end face of the square pipe. The left ends of the flow guide plates are bent towards the upper side in the bottom cylinder, and the upward bending angles of the bending parts of the flow guide plates from bottom to top are sequentially increased. According to the utility model, the plurality of uniformly distributed guide plates are arranged in the square tube, so that the airflow uniformity and the speed directivity at the air inlet below the airflow distribution plate are improved, the airflow distribution plate can be closer to an ideal effect through the airflow distribution plate at a uniform airflow speed, and materials can reach an ideal fluidized state; meanwhile, the airflow velocity directivity is high, the airflow velocity utilization rate can be increased, the target fluidization velocity can be achieved under the smaller fan frequency, the energy utilization rate is increased, and the equipment energy consumption is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluidized bed technology, and in particular to a fluidized bed air inlet guide device. Background Technology

[0002] Fluidized beds are crucial production equipment for solid dosage forms in the pharmaceutical industry, serving multiple functions such as drying, granulation, and coating. An external fan draws gas to fluidize the material within the chamber. Different structures of the airflow distribution plate, a key component of the fluidized bed, result in varying fluidization states. Traditional fluidized bed inlet structures lack airflow guidance, leading to low airflow uniformity and velocity directionality at the inlet below the airflow distribution plate. This negatively impacts the plate's effectiveness, preventing the achievement of ideal fluidization. Furthermore, the low velocity directionality prevents efficient utilization of airflow direction, resulting in energy loss and increased overall equipment energy consumption. Utility Model Content

[0003] To address the problem that traditional fluidized bed air inlet structures lack flow guides, resulting in low airflow uniformity and velocity directionality at the air inlet below the airflow distribution plate, thus affecting the effectiveness of the airflow distribution plate and preventing the achievement of ideal fluidization, this invention provides a fluidized bed air inlet flow guide device. By installing multiple evenly distributed flow guides inside a square tube, and bending the ends of the flow guides into the bottom cylinder, the airflow uniformity and velocity directionality at the air inlet below the airflow distribution plate are improved, thereby enhancing the effectiveness of the airflow distribution plate and saving energy.

[0004] To achieve the above objectives, this utility model provides a fluidized bed air inlet guide device, comprising a bottom cylinder, an airflow distribution plate, a square tube, and a square-connected round tube. The airflow distribution plate is located at the upper end of the bottom cylinder, and the square tube is located on one side of the outer wall of the bottom cylinder, communicating with the outer wall of the bottom cylinder. The square end of the square-connected round tube is sealed and connected to the outer end of the square tube, and the round end is connected to an external fan. The feature is that: the square tube is provided with a plurality of vertically and evenly distributed guide plates. The front and rear end faces of the guide plates are respectively sealed and fixedly connected to the front and rear inner side walls of the square tube. The right end face is flush with the right end face of the square tube, and the left end is bent towards the upper side of the bottom cylinder. The bending angle of the bent portion of the plurality of guide plates increases sequentially from bottom to top.

[0005] Preferably, the bending length of the guide plate is set to 12% to 15% of the bottom cylinder diameter.

[0006] Preferably, all the guide plates inside the square tube are inclined to the lower right side and have an inclination angle of 1.5 to 2° with the horizontal plane.

[0007] Preferably, the guide plate is made of 316L stainless steel and has a thickness of 2-3 mm.

[0008] Preferably, the guide vanes are provided in five parts, arranged from bottom to top as a first guide vane, a second guide vane, a third guide vane, a fourth guide vane, and a fifth guide vane. The angle between the bent part of the first guide vane and the horizontal plane is set to 15°, the angle between the bent part of the second guide vane and the horizontal plane is set to 30°, the angle between the bent part of the third guide vane and the horizontal plane is set to 45°, the angle between the bent part of the fourth guide vane and the horizontal plane is set to 60°, and the angle between the bent part of the fifth guide vane and the horizontal plane is set to 75°.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting multiple evenly distributed guide plates inside the square tube, and bending the ends of the guide plates extending into the bottom cylinder upwards with the bending angle increasing from bottom to top, this utility model improves the uniformity and velocity directionality of the airflow at the air inlet below the airflow distribution plate. The uniform airflow velocity through the airflow distribution plate allows the airflow distribution plate to more closely approximate the ideal effect, enabling the material to reach the ideal fluidization state. At the same time, the higher airflow velocity directionality can improve the utilization rate of airflow velocity, enabling the target fluidization velocity to be achieved at a lower fan frequency, improving energy utilization and effectively reducing equipment energy consumption. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0011] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present utility model.

[0012] In the diagram: 1. Bottom tube, 2. Square tube, 3. Square-to-round tube, 4. Guide plate, 4a. First guide plate, 4b. Second guide plate, 4c. Third guide plate, 4d. Fourth guide plate, 4e. Fifth guide plate. Detailed Implementation

[0013] 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.

[0014] like Figure 1 , Figure 2As shown, this utility model embodiment includes a bottom cylinder 1, an airflow distribution plate, a square tube 2, and a square-connected round tube 3. The airflow distribution plate is located at the upper end of the bottom cylinder 1. The square tube 2 is located on the outer side wall of one side of the bottom cylinder 1 and is connected to the outer side wall of the bottom cylinder 1. The square end of the square-connected round tube 3 is sealed and connected to the outer end of the square tube, and the round end is connected to an external fan. Several vertically and evenly distributed guide plates 4 are provided inside the square tube 2. The front and rear end faces of the guide plates 4 are sealed and fixedly connected to the front and rear inner side walls of the square tube 2, respectively. The right end face is flush with the right end face of the square tube 2, and the left end is bent towards the upper side of the bottom cylinder 1. The bending angle of the bent part of the several guide plates 4 from bottom to top increases sequentially.

[0015] Preferably, the bending length of the guide plate 4 is set to 12% to 15% of the diameter of the bottom cylinder 1.

[0016] Preferably, all the guide vanes inside the square tube 2 are inclined to the lower right, and the angle θ between them and the horizontal plane is set to 1.5 to 2°.

[0017] Preferably, the deflector plate 4 is made of 316L stainless steel with a thickness of 2-3mm.

[0018] Preferably, the deflector plate 4 has 5 pieces, which are arranged from bottom to top as a first deflector plate 4a, a second deflector plate 4b, a third deflector plate 4c, a fourth deflector plate 4d, and a fifth deflector plate 4e. The angle α1 between the bent part of the first deflector plate 4a and the horizontal plane is set to 15°, the angle α2 between the bent part of the second deflector plate 4b and the horizontal plane is set to 30°, the angle α3 between the bent part of the third deflector plate 4c and the horizontal plane is set to 45°, the angle α4 between the bent part of the fourth deflector plate 4d and the horizontal plane is set to 60°, and the angle α5 between the bent part of the fifth deflector plate 4e and the horizontal plane is set to 75°.

[0019] Performance comparison:

[0020] Computational fluid dynamics numerical simulations were performed to compare the embodiment with the comparative example (existing technical solution without the addition of a guide vane) to analyze the velocity uniformity and velocity directionality of the airflow from the square-connected circular pipe 3 to the area below the airflow distribution plate.

[0021] 1. The formula for calculating the velocity uniformity index is:

[0022] (1)

[0023] In formula 1: This represents the velocity at each point on the measured cross-section. This represents the average velocity on the measured cross section. The closer the value is to 1, the better the speed uniformity.

[0024] 2. The evaluation criterion for velocity directivity is the ratio of the output airflow velocity in the z-direction to the resultant velocity. To make a judgment, The larger the value, the higher the speed directivity. The calculation formula is as follows:

[0025] (2)

[0026] In formula 2: This represents the velocity along the z-axis, perpendicular to the airflow distribution plate. This represents the resultant velocity of the airflow.

[0027] Numerical simulations verified that the airflow uniformity index under the comparative airflow distribution plate was 0.410, and the velocity directivity index was 0.067; in this embodiment, the velocity uniformity index was 0.655, and the velocity directivity index was 0.454. Compared to the comparative example, the embodiment shows a significant improvement in both velocity uniformity and velocity directivity. Uniform velocity through the airflow distribution plate allows it to more closely approximate the ideal effect, enabling the material to achieve the desired fluidization state. Simultaneously, higher velocity directivity improves airflow velocity utilization, allowing the target fluidization velocity to be achieved at a lower fan frequency, thus improving energy utilization and effectively reducing equipment energy consumption.

[0028] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A fluidized bed inlet airflow guiding device, comprising a bottom cylinder, an airflow distribution plate, a square tube, and a square-connected round tube, wherein the airflow distribution plate is disposed at the upper end of the bottom cylinder, the square tube is disposed on one side of the outer wall of the bottom cylinder and communicates with the outer wall of the bottom cylinder, the square end of the square-connected round tube is sealed and connected to the outer end of the square tube, and the round end is connected to an external fan, characterized in that: The square tube is provided with several vertically and evenly distributed guide plates. The front and rear end faces of the guide plates are sealed and fixedly connected to the front and rear inner walls of the square tube, respectively. The right end face is flush with the right end face of the square tube, and the left end is bent towards the upper side of the bottom cylinder. The bending angle of the bent part of the guide plates increases sequentially from bottom to top.

2. The fluidized bed inlet guide device according to claim 1, characterized in that: The bending length of the guide plate is set to 12% to 15% of the bottom cylinder diameter.

3. The fluidized bed inlet guide device according to claim 1, characterized in that: All the guide vanes inside the square tube are tilted to the lower right and at an angle of 1.5 to 2° to the horizontal plane.

4. The fluidized bed inlet guide device according to claim 1, characterized in that: The guide plate is made of 316L stainless steel with a thickness of 2-3mm.

5. A fluidized bed inlet guide device according to claim 1, characterized in that: The flow deflector consists of five parts, arranged from bottom to top as a first flow deflector, a second flow deflector, a third flow deflector, a fourth flow deflector, and a fifth flow deflector. The angle between the bent portion of the first flow deflector and the horizontal plane is set to 15°, the angle between the bent portion of the second flow deflector and the horizontal plane is set to 30°, the angle between the bent portion of the third flow deflector and the horizontal plane is set to 45°, the angle between the bent portion of the fourth flow deflector and the horizontal plane is set to 60°, and the angle between the bent portion of the fifth flow deflector and the horizontal plane is set to 75°.

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