A fluidized bed drying column

Abstract

The application discloses a fluidized bed drying tower for adapting to diversified product production requirements. The fluidized bed drying tower comprises a tower body, a bed plate, a feeding structure, a discharging structure and a ring beam. The tower body comprises a tower body and a tower top, the tower body is a straight cylinder, and the feeding structure is arranged above the tower top. The ring beam is arranged in the tower body and is integrally connected with the tower body. The ring beam serves as a support structure of the bed plate, the bed plate is arranged on the ring beam and is adapted to the size of the ring beam. The bed plate is provided with a plurality of ventilation holes. The ring beam is a semi-closed structure with a gap. The discharging structure comprises a discharging port and a spout pipe. The discharging port is arranged at the gap of the ring beam, the discharging port is sealingly connected with the spout pipe, the spout pipe extends through the tower body to the outside of the tower body, and the spout pipe forms an included angle of 30 degrees with the vertical direction.

Description

Technical Field

[0001] This application relates to the field of ammonium phosphate production equipment technology, and in particular to a fluidized bed drying tower. Background Technology

[0002] In the production of phosphate compound fertilizers, the drying process of MAP (Modulated Particulate Air) products produced using the slurry method is crucial. A combination of spray-dried slurry towers and fluidized beds is typically employed. The spray-dried slurry serves as the initial drying stage, where it is sprayed and naturally settles, undergoing preliminary purification and drying through counter-current contact with hot air. The material then enters the fluidized bed. The fluidized bed is supported by a cast-in-place reinforced concrete frame, with a 4.2-meter diameter bed plate equipped with an air hood located 8 meters from the bottom. The concentrated slurry is sprayed from the top of the fluidized bed through spray guns, exchanging heat counter-currently with the hot air from the bottom. It then falls onto the bed plate, forming a material layer. The hot air at the bottom, passing through the air hood, causes the material to boil, resulting in secondary heat exchange. The dried material is discharged to the warehouse via a chute at the fluidized bed outlet. The bottom of the chute forms a 30-degree angle with the tower body, and the fluidized bed plate is surrounded by a ring beam, with only a 1.5-meter-wide gap at the material outlet chute for its installation.

[0003] With changes in production technology, utilizing existing fluidized beds to produce diversified products while retaining the original material outlet chute is a current practical need. Therefore, it is necessary to add a material outlet at an additional location on the fluidized bed plate. Currently, there are two available solutions: one is to remove the annular beam and install a chute, which, while ensuring a 30-degree angle between the chute bottom plate and the tower body for material discharge, compromises the integrity of the annular beam and affects the stability of the fluidized bed structure; the other is to install the chute directly without removing the annular beam, in which case the angle between the chute bottom plate and the tower body reaches 60 degrees, leading to material blockage and preventing normal output. In conclusion, neither of these existing technical solutions can meet the new practical needs of fluidized beds. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a fluidized bed drying tower to meet the diverse production needs of various products.

[0005] The technical solution provided in this application is described below:

[0006] This application provides a fluidized bed drying tower, including: a tower body, a bed plate, a feeding structure, a discharging structure, and an annular beam; The tower body includes a tower body and a tower top. The tower body is cylindrical, and the feeding structure is located above the tower top. The annular beam is located inside the tower body and is cast and connected to the tower body. The annular beam serves as a support structure for the bed board, which is mounted on the annular beam and adapted to the size of the annular beam. The bed board has multiple ventilation holes. The annular beam is a semi-enclosed structure with notches. The discharge structure includes a discharge port and a chute. The discharge port is located at the notch of the annular beam. The discharge port is sealed to the chute. The chute extends through the tower body to the outside of the tower body and forms a 30-degree angle with the vertical direction.

[0007] Optionally, the discharge port is a rectangle with a length of 0.47 meters and a width of 0.33 meters.

[0008] Optionally, a baffle is provided along the edge of the discharge port, the baffle being 0.08 meters high and made of a corrosion-resistant material.

[0009] Optionally, the discharge structure also includes a discharge mask, the size of which is adapted to the discharge port, and the material of the discharge mask is a 316L stainless steel plate with a thickness of 5 mm.

[0010] Optionally, the chute includes an inlet, a pipe body, and an outlet. The inlet is sealed to the discharge port, the pipe body passes through the tower body, and the outlet is connected to a material conveying pipe on the outside of the tower body.

[0011] Optionally, a manhole may be provided on the tower body at the position corresponding to the discharge port.

[0012] Optionally, multiple vents are evenly distributed on the bed board.

[0013] Optionally, the chute is a 316L stainless steel pipe with a thickness of 5 mm.

[0014] As can be seen from the above technical solutions, this application has the following beneficial effects: This application discloses a fluidized bed drying tower, comprising a tower body, a bed plate, a feeding structure, a discharging structure, and an annular beam. The tower body includes a tower frame and a tower top, with the tower frame being cylindrical. The feeding structure is located above the tower top. The annular beam is located inside the tower frame and is cast-in-place with it. The annular beam serves as a support structure for the bed plate, which is mounted on the annular beam and its dimensions are adapted to the annular beam. The bed plate has multiple ventilation holes. The annular beam is a semi-enclosed structure with a notch. The discharging structure includes a discharge port and a chute. The discharge port is located at the notch in the annular beam and is sealed to the chute. The chute extends through the tower frame to the outside of the tower body, forming a 30-degree angle with the vertical direction. The discharge port's location at the notch in the semi-enclosed structure ensures the integrity of the annular beam and maintains the stability of the fluidized bed drying tower. The chute is connected to the outlet and extends through the tower frame to the outside of the tower, ensuring that the chute can be installed at a 30-degree angle, allowing material to be smoothly transported through the chute and reducing blockage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an embodiment of the fluidized bed drying tower provided in this application. Detailed Implementation

[0016] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0017] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0018] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0019] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0020] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] See Figure 1 This application first provides an embodiment of a fluidized bed drying tower, which includes: a tower body 01, a bed plate 02, a feeding structure 03, a discharging structure 04, and an annular beam 05; The tower body 01 includes a tower body and a tower top. The tower body is cylindrical, and a feeding structure 03 is installed above the tower top. A ring beam 05 is installed inside the tower body and is cast and connected to the tower body. The ring beam 05 serves as a supporting structure for the bed plate 02. The bed plate 02 is mounted on the ring beam 05 and is adapted to the size of the ring beam 05. The bed plate 02 is provided with multiple ventilation holes. The ring beam 05 is a semi-enclosed structure with notches. The discharge structure 04 includes a discharge port 041 and a chute 042. The discharge port 041 is located at the notch of the ring beam 05. The discharge port 041 is sealed to the chute 042. The chute 042 passes through the tower body and extends to the outside of the tower body 01. The chute 042 forms a 30-degree angle with the vertical direction.

[0022] The components of this embodiment will be described below: Tower Body 01: This is the overall supporting structure of the fluidized bed drying tower, with a certain thickness between its inner and outer sides. Tower Body 01 includes the tower body and the tower top, with a feed structure 03 located on the top for feeding materials into the tower body. The tower body is cylindrical, with a diameter of 4.2 meters and a height of 13.804 meters. This size design is determined based on production scale, material throughput, and compatibility with other equipment (such as powder spraying towers). The height and diameter of Tower Body 01 affect the residence time and fluidization state of the material within the fluidized bed drying tower. A taller tower body 01 provides a longer material residence path, allowing sufficient time for the material to fully contact the hot air for drying or reaction; a suitable diameter ensures uniform material distribution within the bed, avoiding localized poor fluidization. Tower Body 01 is typically made of metallic materials, such as carbon steel or stainless steel, to withstand certain pressures and temperatures. The tower body 01 is supported by a cast-in-place reinforced concrete frame structure. This support structure provides a stable foundation for the fluidized bed drying tower, ensuring that the tower body 01 will not shake or deform due to the movement of internal materials, the pressure of hot air, or other factors during operation.

[0023] Bed Plate 02: Bed Plate 02 is a key component for material fluidization. When hot air enters the bed from the bottom through the ventilation holes on Bed Plate 02, the material is suspended on Bed Plate 02, forming a fluidized state. In this state, the material particles can be fully mixed, increasing the contact area between the material and the hot air.

[0024] Feeding Structure 03: A feeding structure 03 or feeding device, such as a spray gun, is installed at the top of the fluidized bed drying tower. The spray gun includes a nozzle and a connecting pipe. The nozzle is used to spray out the concentrated slurry, and the connecting pipe transports the slurry from an external slurry supply system to the nozzle. The spray gun is positioned at the top of the fluidized bed drying tower, allowing the slurry to be sprayed vertically downwards. This facilitates direct countercurrent contact and heat exchange drying between the slurry and the hot air coming from the bottom after entering the fluidized bed drying tower.

[0025] Discharge structure 04: After the material has reached the required drying residence time in the fluidized bed drying tower, the material will be discharged from the bed plate 02 through the discharge structure 04, just like liquid "overflowing". The discharge structure 04 includes a discharge port 041 and a chute 042. The discharge port 041 is located at the notch of the annular beam 05, and the discharge port 041 is sealed to the chute 042.

[0026] Ring beam 05: Ring beam 05 is a cast-in-place structure integrally cast around the bed plate 02 of the fluidized bed drying tower. It is connected to the supporting structure of the tower body 01 of the fluidized bed drying tower, serving to strengthen and stabilize the bed plate 02. Ring beam 05 is generally made of reinforced concrete and has high strength. Ring beam 05 has a notch, which is for installing the discharge structure 04, allowing material to be discharged smoothly. The semi-closed ring beam 05 is cast and connected to the main body, ensuring the integrity of ring beam 05 and also providing a channel for material discharge.

[0027] In this embodiment, the discharge port 041 is located at the notch of the semi-enclosed structure, ensuring the integrity of the annular beam 05 and maintaining the stability of the fluidized bed drying tower. The chute 042 is connected to the outlet and extends through the tower body to the outside of the tower, ensuring that the chute 042 can be installed at a 30-degree angle, thereby allowing the material to be smoothly transported through the chute 042 and reducing blockage.

[0028] In an optional embodiment, the discharge port 041 is a rectangle with a length of 0.47 meters and a width of 0.33 meters.

[0029] In an optional embodiment, a baffle is provided along the edge of the discharge port 041, the baffle being 0.08 meters high and made of a corrosion-resistant material.

[0030] In this optional embodiment, the fluidized bed drying tower needs to be cleaned with water periodically. To prevent the cleaning wastewater from contaminating or corroding the chute 042, a baffle can be installed at the discharge port 041. When the rectangular discharge port 041 has dimensions of 0.47 meters in length and 0.33 meters in width, the baffle should also have dimensions of 0.47 meters in length and 0.33 meters in width, and the bottom of the baffle should be sealed to the discharge port 041 to prevent wastewater leakage. Furthermore, using corrosion-resistant materials to make the baffle can extend its service life.

[0031] In an optional embodiment, the discharge structure 04 further includes a discharge port 041 cover, the size of which is adapted to the discharge port 041, and the material of the discharge port 041 cover is a 316L stainless steel plate with a thickness of 5 mm.

[0032] In this optional embodiment, to prevent material leakage during the operation of the fluidized bed dryer, a discharge port 041 cover is installed to close the discharge port 041. In the embodiment mentioning a baffle, to simultaneously protect the baffle, the dimensions of the discharge port 041 cover will be set to a size that can cover the baffle together, for example, 0.5 meters long, 0.35 meters wide, and 0.09 meters deep.

[0033] In an optional embodiment, the chute 042 includes an inlet, a pipe body, and an outlet. The inlet is sealed to the outlet 041, the pipe body passes through the tower body, and the outlet is connected to the material conveying pipe on the outside of the tower body.

[0034] In this optional embodiment, the 30-degree angle between the outlet of chute 042 and the vertical direction is a fixed and necessary condition. Therefore, the pipe body is set to pass through the tower body, and the outlet is connected to the material conveying pipe on the outside of the tower body, so as to convey the material out of the fluidized bed drying tower.

[0035] In an optional embodiment, a manhole 06 is provided on the tower body at the position corresponding to the discharge port 041.

[0036] In this optional embodiment, manhole 06 is a circular or elliptical opening formed on the fluidized bed drying tower body 01, mainly to facilitate personnel entering the fluidized bed drying tower for inspection, maintenance, cleaning, and equipment installation. In the embodiment mentioned above with the discharge port 041 cover, the manhole 06 is positioned corresponding to the discharge port 041. When cleaning the fluidized bed drying tower or discharging materials, workers can easily cover or remove the discharge port 041 cover through the manhole 06 without entering the tower body 01, facilitating rapid switching of the fluidized bed drying tower's functions.

[0037] In an optional embodiment, multiple vents are evenly distributed on the bed board 02.

[0038] In this optional embodiment, the air cap is a specially shaped metal component, resembling a mushroom head or a cylindrical structure. The top of the air cap has air outlet holes or slits, while the bottom connects to the ventilation holes of the bed plate 02 for introducing hot air. When hot air is transported from the bottom of the fluidized bed drying tower to below the bed plate 02, it is evenly distributed onto the bed plate 02 through the air cap. The hot air is blown out from the air outlet holes or slits of the air cap, suspending the material particles on the bed plate 02 and creating a fluidized state. This fluidized state greatly increases the contact area between the material and the hot air, allowing the moisture in the material to evaporate rapidly. Multiple air caps evenly distributed on the bed plate 02 improve drying efficiency and ensure that the product reaches the standard degree of dryness.

[0039] In an optional embodiment, chute 042 is a 316L stainless steel pipe with a thickness of 5 mm.

[0040] In this optional embodiment, using 5 mm thick 361L stainless steel pipe to make chute 042 can prevent material from corroding chute 042, thereby extending the service life of chute 042. It should be noted that other corrosion-resistant materials can also be used to make chute 042, and it is not limited to 316L stainless steel pipe.

[0041] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fluidized bed drying tower, characterized in that, include: Tower body, bed plate, feeding structure, discharging structure and ring beam; The tower body includes a tower body and a tower top. The tower body is cylindrical, and the feeding structure is located above the tower top. The annular beam is located inside the tower body and is cast and connected to the tower body. The annular beam serves as a support structure for the bed board, which is mounted on the annular beam and adapted to the size of the annular beam. The bed board has multiple ventilation holes. The annular beam is a semi-enclosed structure with notches. The discharge structure includes a discharge port and a chute. The discharge port is located at the notch of the annular beam. The discharge port is sealed to the chute. The chute extends through the tower body to the outside of the tower body and forms a 30-degree angle with the vertical direction.

2. The fluidized bed drying tower according to claim 1, characterized in that, The discharge port is a rectangle with a length of 0.47 meters and a width of 0.33 meters.

3. The fluidized bed drying tower according to claim 1, characterized in that, A baffle is provided along the edge of the discharge port. The baffle is 0.08 meters high and is made of corrosion-resistant material.

4. The fluidized bed drying tower according to claim 1, characterized in that, The discharge structure also includes a discharge mask, the size of which is adapted to the discharge port, and the material of the discharge mask is a 316L stainless steel plate with a thickness of 5 mm.

5. The fluidized bed drying tower according to claim 1, characterized in that, The chute includes an inlet, a pipe body, and an outlet. The inlet is sealed to the outlet. The pipe body passes through the tower body, and the outlet is connected to a material conveying pipe on the outside of the tower body.

6. The fluidized bed drying tower according to any one of claims 1-5, characterized in that, A manhole is provided on the tower body at the position corresponding to the discharge port.

7. The fluidized bed drying tower according to any one of claims 1-5, characterized in that, Multiple vents are evenly distributed on the bed board.

8. The fluidized bed drying tower according to any one of claims 1-5, characterized in that, The chute is a 316L stainless steel pipe with a thickness of 5 mm.

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