Hot blast stove for pseudo-boehmite production

Abstract

The utility model belongs to the production application equipment field of pseudo-boehmite, especially relate to a hot blast furnace for pseudo-boehmite production. Including furnace body and with the drying chamber of furnace body intercommunication, drying chamber is away from one end of furnace body and is provided with inlet and outlet, one side of drying chamber is provided with auger conveyor, still be provided with flow baffle in drying chamber, the top of drying chamber still is provided with feed pipe, auger conveyor is connected with feed pipe and is provided, the below of feed pipe is provided with distribution pipe, the distribution pipe is equipped with the feed auger of sleeve, the feed auger rotation setting is in distribution pipe, the bottom of distribution pipe is provided with discharge slot hole. The utility model improves the structure of existing hot blast furnace, makes the raw material that enters into the drying chamber can disperse into, to make the hot air better and the raw material contact, and then reach the purpose that improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of equipment for the production and application of boehmite, and in particular relates to a hot air furnace for the production of boehmite. Background Technology

[0002] Boehmite is an amorphous or weakly crystalline structure, exhibiting a wrinkled, lamellae morphology. Compared to fully crystalline boehmite, it has lower crystallinity and smaller grain size (typically less than 10 nm). Its crystal structure contains a large amount of interlayer water and surface-adsorbed water, giving it thixotropic gel properties. Due to its high specific surface area, controllable pore volume (0.4~1.0 mL / g), excellent colloidal solubility, thermal stability, and weakly crystalline structure, boehmite has irreplaceable applications in petrochemicals, environmental protection, new energy, high-end materials, and biomedicine.

[0003] Existing factories primarily produce boehmite using a neutralization process, which involves four steps: carbonization, high-temperature aging, separation and washing, and drying and shaping. Currently, drying and shaping are mainly accomplished using direct-fired hot air furnaces. There are two main methods for using these furnaces: one is to combine them with a flash dryer; the other is to use them with a drying chamber. In the latter method, workers transport the plate-and-frame filter press material (via an auger) into the drying chamber to remove free water from the surface of the boehmite. While existing hot air furnaces can remove free water from the surface of the boehmite, further improvements in production efficiency and cost reduction remain areas for improvement. Utility Model Content

[0004] This invention addresses the technical problems existing in the drying process of boehmite using existing hot blast stoves, and proposes a hot blast stove for boehmite production that is reasonably designed, has a simple structure, and can be improved based on existing hot blast stoves to enhance the free water removal efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a hot air furnace for the production of pseudo-boehmite, including a furnace body and a drying chamber connected to the furnace body. The drying chamber has an inlet and outlet at one end away from the furnace body. An auger conveyor is provided on one side of the drying chamber. A guide baffle is also provided inside the drying chamber. A feed pipe is also provided at the top of the drying chamber. The auger conveyor is connected to the feed pipe. A distribution pipe is provided below the feed pipe. A conveying auger is installed inside the distribution pipe. The conveying auger is rotatably installed inside the distribution pipe. A discharge trough is provided at the bottom of the distribution pipe.

[0006] Preferably, a guide pipe is also provided below the distribution pipe. The guide pipe is located below the discharge trough and is square in shape. A discharge port is provided at the end of the guide pipe away from the discharge trough and is located diagonally below the discharge trough.

[0007] Preferably, the distribution pipe is provided with baffles at both ends of the conveying auger, and the length of the discharge trough is the same as the length of the spiral blades of the conveying auger.

[0008] Preferably, the feed pipe is located on the side close to the furnace body, and the feed pipe passes through the guide baffle.

[0009] Preferably, the bottom of the flow guide baffle is also provided with a guide plate, which is set in an obtuse angle shape, and the discharge port is set towards the vertex of the guide plate.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model provides a hot air furnace for the production of pseudo-boehmite. By improving the structure of the existing hot air furnace, the raw materials entering the drying chamber can be dispersed, thereby allowing the hot air to better contact the raw materials and thus improving production efficiency. At the same time, the technical solution provided by this utility model can be modified on the basis of the existing system and is suitable for large-scale promotion and use. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of the hot blast stove for producing boehmite provided in Example 1; Figure 2 A schematic diagram of the distribution pipe provided in Example 1; Figure 3 A schematic diagram of the internal structure of the distribution pipe provided in Example 1; In the above figures, 1 is the furnace body; 11 is the circulation pipe; 2 is the drying chamber; 21 is the inlet and outlet; 22 is the guide baffle; 23 is the moisture outlet; 3 is the auger conveyor; 4 is the feed pipe; 41 is the distribution hopper; 5 is the distribution pipe; 51 is the discharge trough; 52 is the partition plate; 53 is the conveying auger; 6 is the guide pipe; and 7 is the guide plate. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0014] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0015] Example 1, as Figures 1-3 As shown, this embodiment aims to provide a hot air furnace that can improve drying efficiency in order to accelerate the drying of boehmite filter raw materials. To achieve the above objective, this embodiment provides a hot air furnace for boehmite production, including a furnace body 1 and a drying chamber 2 connected to the furnace body 1. The drying chamber 2 is provided with an inlet / outlet 21 at the end away from the furnace body 1. In this embodiment, the inlet / outlet 21 is only used as a discharge port. When discharging, negative pressure extraction can be used, or the material can be conveyed by a conveyor belt. A moisture outlet 23 is provided at the top of the drying chamber 2 at the end away from the furnace body 1 for dehumidification, and a return air outlet is provided at the other end. A circulation pipe 11 is provided between the return air outlet and the air inlet of the furnace body 1. At the same time, a guide baffle 22 is also provided in the drying chamber 2. The guide baffle 22 is located below the return air outlet and extends to a position close to the moisture outlet 23. In this way, the dried hot air can return to the furnace body 1, thus achieving the purpose of energy saving. Meanwhile, an auger conveyor 3 is provided on one side of the drying chamber 2. The above structure is a common existing structure, so it will not be described in detail in this embodiment.

[0016] To improve drying efficiency, in this embodiment, a feed pipe 4 is installed at the top of the drying chamber 2, and the outlet of the auger conveyor 3 is connected to the feed pipe 4. A distribution pipe 5 is installed below the feed pipe 4, perpendicular to it. An auger 53, including a rotating shaft and spiral blades, is installed inside the distribution pipe 5. A motor and reducer for driving the rotating shaft are installed outside the drying chamber 2. A discharge trough 51 is installed at the bottom of the distribution pipe 5. The discharge trough 51 is rectangular, ensuring that the boehmite, which still contains some moisture, does not fall entirely from a single discharge trough 51 during conveying by the auger 53. Instead, it falls continuously, dispersing the moisture. This allows the air blown into the drying chamber 2 from the furnace body 1 to better contact the boehmite filter material, achieving rapid drying.

[0017] To further disperse the boehmite filter media, a guide pipe 6 is installed below the distribution pipe 5. The guide pipe 6 is positioned below the discharge trough 51 and is square in shape. An outlet is located at the end of the guide pipe 6 furthest from the discharge trough 51, at an angle slightly below the outlet. The guide pipe 6 serves to slow down the falling speed of the boehmite filter media, thus preventing its accumulation during falling.

[0018] To further disperse the pseudo-boehmite filter media, a guide pipe 6 is installed near the side of the furnace body 1, and the guide pipe 6 passes through the baffle 22. This allows it to be closer to the air outlet of the furnace body 1, resulting in stronger airflow and easier dispersion. Simultaneously, a guide plate 7 is installed at the bottom of the baffle 22, with the guide plate 7 at an obtuse angle and the outlet facing the apex of the guide plate 7. The "top plate" mentioned here refers to the connection point of the two plates of the guide plate 7. The guide plate 7 serves two purposes: one is to allow the pseudo-boehmite filter media to move against the airflow, and the other is to allow some hot air to flow back, creating disturbance.

[0019] To concentrate the material discharge at the air outlet of the furnace body 1, in this embodiment, a baffle 52 is provided inside the distribution pipe 5. The baffle 52 is located at both ends of the conveying auger 53, and the length of the discharge slot 51 is the same as the length of the spiral blades of the conveying auger 53. At the same time, a triangular-shaped distribution hopper 41 is provided at the bottom of the feed pipe 4, so that when the feed is large, some of the material will be more easily dispersed into the distribution pipe 5.

[0020] Considering the possibility of clumping in the pseudo-boehmite filter media, steel nails or cones can be evenly welded onto the spiral blades of the conveying auger 53 to break up the pseudo-boehmite filter media. Of course, the conveying auger 53 itself has a certain crushing capacity, but the effect is better after adding steel nails or cones. Whether or not to add them depends mainly on the moisture content of the pseudo-boehmite filter media.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A hot air furnace for producing pseudo-boehmite, comprising a furnace body and a drying chamber communicating with the furnace body, wherein the drying chamber has an inlet and outlet at one end away from the furnace body, a screw conveyor is provided on one side of the drying chamber, and a guide baffle is also provided inside the drying chamber, characterized in that, The top of the drying chamber is also provided with a feed pipe, and the auger conveyor is connected to the feed pipe. A distribution pipe is provided below the feed pipe, and a conveying auger is installed inside the distribution pipe. The conveying auger is rotatably installed inside the distribution pipe, and a discharge trough is provided at the bottom of the distribution pipe.

2. The hot blast stove for producing boehmite according to claim 1, characterized in that, A guide pipe is also provided below the distribution pipe. The guide pipe is located below the discharge trough and is square in shape. A discharge port is provided at the end of the guide pipe away from the discharge trough and is located diagonally below the discharge trough.

3. The hot blast stove for producing boehmite according to claim 2, characterized in that, The distribution pipe is equipped with baffles at both ends of the conveying auger, and the length of the discharge trough is the same as the length of the spiral blades of the conveying auger.

4. The hot blast stove for producing boehmite according to claim 3, characterized in that, The feed pipe is located on the side near the furnace body and passes through the guide baffle.

5. The hot blast stove for producing boehmite according to claim 4, characterized in that, The bottom of the flow guide baffle is also provided with a guide plate, which is set in an obtuse angle shape, and the discharge port is set towards the apex of the guide plate.

Images