Fluidized bed spray dryer capable of recycling hot air

Abstract

The utility model is applicable to the technical field of spray drying, and provides a fluidized bed spray dryer capable of recycling hot air, which comprises a drying tower, a hot air component, a fluidization component and a circulation component, the hot air component and the fluidization component are respectively communicated with the drying tower, the circulation component is communicated with the hot air component, and a stock bin, a drying bin and a fluidization bin are arranged inside the drying tower. The hot air assembly comprises an air supply pipe, a heat supply pipe communicated with the drying tower, a filtering bin and a heating bin, wherein the filtering bin and the heating bin are arranged between the air supply pipe and the heat supply pipe. The circulating assembly comprises a circulating pipe connected with the air supply pipe. The device solves the problems that hot air extracted through fluidization is directly discharged to pollute the environment, and heat cannot be utilized, and achieves the effects that the hot air extracted through fluidization directly circulates to enter a heat supply pipeline, and secondary recycling is conducted on the hot air.

Description

Technical Field

[0001] This utility model relates to the field of spray drying technology, and more specifically, it relates to a fluidized bed spray dryer that recycles hot air. Background Technology

[0002] Spray dryers are devices that can simultaneously dry and granulate materials, and are widely used in the food, chemical, and pharmaceutical industries. With continuous technological development, fluidized bed technology and spray drying technology have been gradually combined to form fluidized bed spray dryers. Materials enter the fluidized bed through a feeding device, where they are suspended and fluidized under the action of hot air. The atomized droplets come into full contact with the hot air in the fluidized bed, causing the moisture to evaporate rapidly and forming dry granules. When the granules grow to a specified size, they are discharged through a discharge device.

[0003] Although fluidized bed spray dryers allow materials to fully contact hot air in a fluidized state, accelerating drying and granulation, the hot air is drawn out by a fan, filtered, and then directly discharged into the atmosphere through pipes during the fluidization process. This not only pollutes the air but also results in the direct loss of heat from the hot air, preventing its reuse. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fluidized bed spray dryer that allows the hot air extracted from the fluidized bed to be directly circulated into the heating pipeline for secondary recycling of the hot air.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A fluidized bed spray dryer for circulating and recovering hot air includes a drying tower, a hot air assembly and a fluidization assembly respectively connected to the drying tower, and a circulation assembly connected to the hot air assembly. The drying tower is provided with a hopper, a drying chamber and a fluidization chamber. The hot air assembly includes an air supply pipe, a heating pipe connected to the drying tower and a filter chamber and a heating chamber disposed between the air supply pipe and the heating pipe. The circulation assembly includes a circulation pipe connected to the air supply pipe.

[0007] The present invention is further configured such that: the air supply pipe is connected to the filter chamber, and a filter screen is provided inside the filter chamber.

[0008] The present invention is further configured such that: the heating chamber is located at the bottom of the filter chamber and is connected to the filter chamber, and the heating chamber is provided with multiple heating meshes inside.

[0009] The present invention is further configured such that the heating pipe is connected to the interior of the heating chamber.

[0010] The present invention is further configured such that: the circulation component further includes a fan, and an air inlet pipe and an air outlet pipe respectively connected to the fan, wherein the air inlet pipe is connected to the fluidization component.

[0011] The present invention is further configured such that: the exhaust pipe is located on the side of the fan away from the air inlet pipe, and the side of the exhaust pipe away from the air inlet pipe is connected to a circulation pipe.

[0012] By adopting the above technical solution, during fluidized drying, the hot air discharged from the fluidization process is transported to the air supply pipe through the circulation pipe, mixed with the air again, filtered by the filter chamber and heated by the heating chamber, and then transported back to the silo through the heating pipe for recycling.

[0013] The present invention is further configured such that: the fluidization component includes a filter box and a connecting pipe communicating with the drying tower, and a collection chamber is provided at the bottom of the filter box.

[0014] The present invention is further configured such that: the hopper is connected to the hot air assembly, and the fluidization chamber is connected to the fluidization assembly.

[0015] The present invention is further configured such that: a spray pipe is connected inside the drying chamber, and an atomizing head is provided at the end of the spray pipe.

[0016] The beneficial effects of this utility model are:

[0017] By setting up a circulation pipe connected to the air supply pipe, the circulation component and the hot air component are combined, so that the hot air is filtered again and then transported to the inside of the silo through the heating pipe for recycling. On the one hand, this can reduce air pollution caused by direct exhaust of hot air, and on the other hand, it can recover and utilize heat during the hot air circulation process. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the fluidized bed spray dryer for circulating and recovering hot air according to this utility model.

[0020] Figure 2 for Figure 1 The top view shown.

[0021] Figure 3 for Figure 1 The left view shown.

[0022] Figure 4 for Figure 1 The diagram shows the internal structure of the drying tower.

[0023] Figure 5 for Figure 1The diagram shows the connection between the hot air assembly and the circulation assembly.

[0024] Figure 6 for Figure 5 The diagram shows the internal structure of the hot air assembly.

[0025] Explanation of reference numerals in the attached diagram: 1. Drying tower; 11. Silo; 12. Drying chamber; 13. Fluidization chamber; 14. Spray pipe; 141. Atomizing head;

[0026] 2. Hot air assembly; 21. Air supply duct; 22. Filter chamber; 221. Filter screen; 23. Heating chamber; 231. Heating screen; 232. Temperature sensor; 24. Heating pipe;

[0027] 3. Fluidization assembly; 31. Filter box; 32. Collection chamber; 33. Connecting pipe;

[0028] 4. Circulation component; 41. Fan; 42. Inlet duct; 43. Exhaust duct; 44. Circulation pipe. Detailed Implementation

[0029] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the present utility model, and therefore only shows the components relevant to the present utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] Example 1, please refer to Figure 1-4 A fluidized bed spray dryer with circulating hot air recovery includes a drying tower 1, a hot air assembly 2 and a fluidizing assembly 3 respectively connected to the drying tower 1, and a circulation assembly 4 connected to the hot air assembly 2. The air extraction assembly 4 generates airflow, causing the airflow inside the drying tower 1 to pass through the secondary filtration assembly 3 for filtration. Finally, the hot air is transported by the air extraction assembly 4 to the hot air assembly 2 for circulation, and then returned to the drying tower 1 through the hot air assembly 2. During the hot air flow, a fluidized airflow is formed in the drying tower 1, and granulation is achieved by the contact between the material and the hot air under the fluidized airflow.

[0031] Please refer to Figure 1-4The drying tower 1 is equipped with a hopper 11, a drying chamber 12, and a fluidization chamber 13. The drying chamber 12 is located on top of the hopper 11, and the fluidization chamber 13 is located on top of the drying chamber 12. The hopper 11 is connected to the hot air assembly 2, through which hot air can be transported into the drying tower 1 to dry the material. The drying chamber 12 is connected to a spray pipe 14, with an atomizing head 141 at the end of the spray pipe 14. The material can be transported into the drying chamber 12 through the spray pipe 14 and finally atomized and dispersed into the drying chamber 12 by the atomizing head 141.

[0032] Please refer to Figure 1-3 The fluidizing assembly 3 is connected to the fluidizing chamber 13. The fluidizing assembly 3 includes a filter box 31 and a connecting pipe 33 connected to the drying tower 1. A collection chamber 32 is provided at the bottom of the filter box 31. A filter screen is provided inside the filter box 31. The hot air from the fluidizing chamber 13 passes through the connecting pipe 33 under fluidization and enters the filter box 31 for filtration. The filtered material can enter the collection chamber 32 for easy collection. The filtered hot air continues to enter the circulation assembly 4 for recycling under fluidization.

[0033] Please refer to Figure 1-3 and Figure 5 The circulation component 4 includes a fan 41, a circulation pipe 44 connected to the air supply pipe 21, and an air inlet pipe 42 and an air outlet pipe 43 respectively connected to the fan 41. The air inlet pipe 42 is connected to the fluidization component 3. Specifically, the air inlet pipe 42 is connected to the filter box 31, and the filtered hot air in the filter box 31 can flow along the air inlet pipe 42. The air outlet pipe 43 is located on the side of the fan 41 away from the air inlet pipe 42, and the side of the air outlet pipe 43 away from the air inlet pipe 42 is connected to the circulation pipe 44. When the fan 41 operates, the airflow in the filter box 31 enters the fan 41 through the air inlet pipe 42, and then continues to flow along the air outlet pipe 43 to the circulation pipe 44, and finally is transported to the hot air component 2 for recycling. The gas undergoes fluidization as it flows along the drying chamber 12, fluidization chamber 13, connecting pipe 33, filter box 31, air inlet pipe 42, fan 41, air outlet pipe 43, and circulation pipe 44.

[0034] Please refer to Figure 1-3 and Figure 5-6The hot air assembly 2 includes an air supply duct 21, a heating pipe 24 connected to the drying tower 1, and a filter chamber 22 and a heating chamber 23 disposed between the air supply duct 21 and the heating pipe 24. The air supply duct 21 is connected to the filter chamber 22 and has an opening at the top, allowing air to enter the filter chamber 22 through the air supply duct 21. The air supply duct 21 is connected to a circulation pipe 44, allowing hot air to enter the air supply duct 21 along the circulation pipe 44. The filter chamber 22 is equipped with a filter screen 221. After being filtered by the filter screen 221, the hot air and air entering the filter chamber 22 flow downwards into the heating chamber 23. The heating chamber 23 is located at the bottom of the filter chamber 22 and is connected to it. The heating chamber 23 contains multiple heating screens 231, and a temperature sensor 232 is located at the top of the heating chamber 23. The temperature sensor 232 is connected to each of the multiple heating screens 231 and can detect the temperature of the multiple heating screens 231. Depending on the inlet air temperature, multiple heating grids 231 can be selectively activated. Under the control of temperature sensor 232, the hot air and air are further heated to the required drying temperature by the heating grids 231. It should be noted that the temperature sensor 232 can be a platinum resistance temperature sensor of the PT100 type, such as a resistance temperature detector (RTD). The heating pipe 24 is connected to the interior of the heating chamber 23, and the heated hot air and air ultimately enter the drying tower through the heating pipe 24.

[0035] Specifically, air enters the filter chamber 22 through the air supply duct 21, and after filtration, it enters the heating chamber 23 and is heated to the required drying temperature. It then continues to be conveyed to the material silo 11 along the heating pipe 24. The material is conveyed to the drying chamber 12 through the spray pipe 14, and finally atomized and dispersed into the drying chamber 12 by the atomizing head 141. The operation of the fan 41 causes the hot air in the drying chamber 12 to enter the filter box 31 along the connecting pipe 33 for filtration. After filtration, it enters the fan 41 along the air inlet pipe 42, and then enters the exhaust pipe 43 and the circulation pipe 44 for circulation. The gas undergoes fluidization as it flows through the drying chamber 12, fluidization chamber 13, connecting pipe 33, filter box 31, air inlet pipe 42, fan 41, exhaust pipe 43, and circulation pipe 44. The hot air and material come into contact under fluidization, accelerating moisture evaporation and forming dry particles.

[0036] During fluidized drying, the hot air discharged from the fluidization process is transported through the circulation pipe 44 to the air supply pipe 21, where it is remixed with the air. After being filtered by the filter chamber 22 and heated by the heating chamber 23, it is then transported back to the material silo 11 through the heating pipe 24 for recycling. This not only avoids the direct emission of hot air and pollution of the air, but also allows for the reuse of the heat of the hot air during the hot air circulation process.

[0037] By setting up a circulation pipe 44 connected to the air supply pipe 21, the circulation component 4 and the hot air component 2 are combined, so that the hot air is filtered again and then transported to the inside of the silo 11 through the heating pipe 24 for recycling. On the one hand, this can reduce air pollution caused by direct discharge of hot air, and on the other hand, it can recover and utilize heat during the hot air circulation process.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0040] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A fluidized bed spray dryer for circulating and recovering hot air, characterized in that: The equipment includes a drying tower (1), a hot air assembly (2) and a fluidization assembly (3) respectively connected to the drying tower (1), and a circulation assembly (4) connected to the hot air assembly (2). The drying tower (1) is provided with a hopper (11), a drying chamber (12) and a fluidization chamber (13). The hot air assembly (2) includes an air supply pipe (21), a heating pipe (24) connected to the drying tower (1), and a filter chamber (22) and a heating chamber (23) disposed between the air supply pipe (21) and the heating pipe (24). The circulation assembly (4) includes a circulation pipe (44) connected to the air supply pipe (21).

2. A fluidized bed spray dryer for circulating and recovering hot air according to claim 1, characterized in that: The air supply pipe (21) is connected to the filter chamber (22), and a filter screen (221) is installed inside the filter chamber (22).

3. A fluidized bed spray dryer for circulating and recovering hot air according to claim 2, characterized in that: The heating chamber (23) is located at the bottom of the filter chamber (22) and is connected to the filter chamber (22). Multiple heating meshes (231) are installed inside the heating chamber (23).

4. A fluidized bed spray dryer for circulating and recovering hot air according to claim 3, characterized in that: The heating pipe (24) is connected to the interior of the heating chamber (23).

5. A fluidized bed spray dryer for circulating and recovering hot air according to claim 1, characterized in that: The circulation component (4) also includes a fan (41), and an air inlet pipe (42) and an air outlet pipe (43) respectively connected to the fan (41), wherein the air inlet pipe (42) is connected to the fluidization component (3).

6. A fluidized bed spray dryer for circulating and recovering hot air according to claim 5, characterized in that: The exhaust pipe (43) is located on the side of the fan (41) away from the air inlet pipe (42), and the side of the exhaust pipe (43) away from the air inlet pipe (42) is connected to a circulation pipe (44).

7. A fluidized bed spray dryer for circulating and recovering hot air according to claim 1, characterized in that: The fluidization assembly (3) includes a filter box (31) and a connecting pipe (33) communicating with the drying tower (1). A collection bin (32) is provided at the bottom of the filter box (31).

8. A fluidized bed spray dryer for circulating and recovering hot air according to claim 1, characterized in that: The hopper (11) is connected to the hot air assembly (2), and the fluidization hopper (13) is connected to the fluidization assembly (3).

9. A fluidized bed spray dryer for circulating and recovering hot air according to claim 8, characterized in that: The drying chamber (12) is connected to a spray pipe (14), and an atomizing head (141) is provided at the end of the spray pipe (14).

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