Environmentally friendly phosphogypsum calcining furnace

Abstract

This utility model discloses an environmentally friendly phosphogypsum calcining furnace, including a calcining furnace, a linkage structure and a heating structure assembled outside the calcining furnace. A feeding hopper is provided on the right side of the calcining furnace and is connected to it. The linkage structure includes a rotating gear installed in the middle of the calcining furnace and a transmission gear meshing with the outer wall of the rotating gear, as well as a servo motor located on the left side of the transmission gear. Through the cooperation of the linkage structure and the heating structure, during calcination, the screw feeder conveys raw materials into the feeding hopper. The servo motor starts and drives the transmission gear, the rotating gear and the calcining furnace to rotate. It also drives the first sprocket, the first chain and the second sprocket to rotate through the connecting rod, thereby further driving the first chain transmission structure and the second chain transmission structure to rotate. Finally, it drives the two dispersing rods to rotate synchronously at high speed, dispersing the material entering the feeding hopper and reducing the problem of blocky gypsum material clogging the feeding hopper.

Description

Technical Field

[0001] This utility model relates to a calcining furnace, and more particularly to an environmentally friendly phosphogypsum calcining furnace. Background Technology

[0002] Phosphogypsum is a byproduct of ammonium phosphate production in phosphate fertilizer companies. To process it into usable gypsum products, it typically requires drying and calcination. After drying, the phosphogypsum enters a calcination furnace. During calcination, the phosphogypsum undergoes a chemical reaction at high temperatures, losing some of its water of crystallization and transforming into hemihydrate or anhydrous gypsum. Calcination temperature and time are key factors affecting product quality.

[0003] Chinese patent CN212870733U discloses an environmentally friendly calcining furnace for gypsum processing. It achieves heat exchange between the material and the heat exchange tubes on the surface of the heat transfer oil within the furnace. A Roots blower is used to spray and assist the flow, causing the material to boil within the furnace, thus increasing the heat exchange area and effect. This improves the thermal efficiency and heat utilization rate of the environmentally friendly calcining furnace for gypsum processing, resulting in faster calcination, lower energy consumption, larger production scale, better production environment, higher automation, and more stable product quality. It is suitable for large-scale continuous calcination production of desulfurized gypsum and phosphogypsum. The calcining furnace has the following defects: Although the flow-assisted blowing with a Roots blower can improve the furnace efficiency, the current gypsum calcination mainly focuses on natural gypsum and chemical gypsum, which are mostly in block or powder form. Before entering the furnace for calcination, they are usually transported to the feed inlet by a screw conveyor and fall into the furnace by gravity. However, the presence of block gypsum can easily cause blockage at the feed inlet during the transport process. At the same time, due to the large volume and mass of block gypsum, it mainly absorbs heat through thermal radiation and natural convection with the surrounding hot gas during calcination. However, its shape and mass make it difficult for the bottom and deep inside to fully contact the hot air flow, thus affecting the calcination effect. Utility Model Content

[0004] The present invention aims to solve the above-mentioned problems existing in the calcination furnace of the prior art and to provide an environmentally friendly phosphogypsum calcination furnace.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an environmentally friendly phosphogypsum calcining furnace, comprising a calcining furnace, a linkage structure and a heating structure assembled outside the calcining furnace, wherein a feeding hopper is provided on the right side of the calcining furnace and connected thereto; the linkage structure includes a rotating gear installed in the middle of the calcining furnace and a transmission gear meshing with the outer wall of the rotating gear, and a servo motor located on the left side of the transmission gear, wherein a connecting rod is fixedly connected to one end of the transmission gear away from the servo motor, and a first sprocket is fixedly connected to the other end of the connecting rod; a first chain is meshed with the outside of the first sprocket, and a second sprocket is also meshed with the inner wall of the first chain; and two symmetrically distributed crushing rods are provided inside the feeding hopper.

[0006] Preferably, a first chain drive structure is provided between the two breaking rods, and a second chain drive structure is provided between the first chain drive structure and the second sprocket. A blocking frame for blocking external damage is provided on the outside of the first chain drive structure, the second chain drive structure, the first sprocket, the first chain, and the second sprocket.

[0007] Preferably, the heating structure includes a heating frame sleeve rotatably connected to the outside of the calcining furnace via bearings and heating wires installed inside the heating frame sleeve.

[0008] Preferably, the heating frame is provided with an air inlet pipe and an air outlet pipe for air intake and exhaust, and the inner walls of the air inlet pipe and the air outlet pipe are provided with one-way valves.

[0009] Preferably, the heating frame is provided with an extension plate on its exterior, the servo motor is mounted on the top surface of the extension plate, and the output end of the servo motor is fixedly connected to the transmission gear. Preferably,

[0010] Therefore, this utility model has the following beneficial effects:

[0011] (1) Through the cooperation of the linkage structure and the heating structure, the raw material is conveyed into the hopper by the screw feeder during calcination. The servo motor starts to drive the transmission gear, the rotating gear and the calcination furnace to rotate. The first sprocket, the first chain and the second sprocket are driven to rotate through the connecting rod, which further drives the first chain drive structure and the second chain drive structure to rotate. Finally, the two dispersing rods rotate synchronously at high speed to disperse the material entering the hopper and reduce the problem of blocky gypsum material clogging the hopper.

[0012] (2) The gypsum after being broken up enters the calcining furnace. The centrifugal force generated by the rotation of the calcining furnace is used to effectively throw the gypsum blocks into the furnace, thereby improving the calcination efficiency and uniformity.

[0013] (3) After receiving the electrical signal, the heating wire heats up rapidly. Its heat is quickly transferred to the inside of the heating frame through efficient electrical heat conduction, and then evenly radiates to the entire calcination furnace space, ensuring that the gypsum in the furnace can be subjected to stable heat, thereby greatly improving the quality of gypsum calcination. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the overall structure of the present utility model. Figure 2 .

[0016] Figure 3 This is a schematic diagram of the right side of this utility model.

[0017] Figure 4 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0018] Figure 5 This is a partial schematic diagram of the linkage structure of this utility model. Figure 1 .

[0019] Figure 6 This is a partial schematic diagram of the linkage structure of this utility model. Figure 2 .

[0020] In the diagram: 1. Calcination furnace; 2. Linkage structure; 21. Rotary gear; 22. Transmission gear; 23. Servo motor; 25. First sprocket; 26. First chain; 27. Second sprocket; 28. Crushing rod; 29. ​​Blocking frame; 3. Heating structure; 31. Heating frame sleeve; 32. Heating wire; 33. Air inlet pipe; 34. Air outlet pipe; 4. Feed hopper. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-6The environmentally friendly phosphogypsum calcining furnace shown includes a calcining furnace 1, a linkage structure 2 and a heating structure 3 assembled outside the calcining furnace 1. A feeding hopper 4 is connected to the right side of the calcining furnace 1, and the outside of the feeding hopper 4 is equipped with a feed inlet adapted to an external screw feeder. The linkage structure 2 includes a rotating gear 21 installed in the middle of the calcining furnace 1, a transmission gear 22 meshing with the outer wall of the rotating gear 21, and a servo motor 23 located to the left of the transmission gear 22. The end of the transmission gear 22 furthest from the servo motor 23 is fixedly connected to... A connecting rod is attached to a first sprocket 25 at one end. A first chain 26 is meshed with the outside of the first sprocket 25, and a second sprocket 27 is meshed with the inner wall of the first chain 26. The inside of the hopper 4 is equipped with two symmetrically distributed crushing rods 28. A first chain drive structure is provided between the two crushing rods 28, and a second chain drive structure is provided between the first chain drive structure and the second sprocket 27. The first chain drive structure, the second chain drive structure, the first sprocket 25, the first chain 26, and the second sprocket 27 are all connected together. The furnace 1 is equipped with an external shielding frame 29 to prevent external damage. The heating structure 3 includes a heating frame sleeve 31 rotatably connected to the outside of the furnace 1 via bearings and a heating wire 32 installed inside the heating frame sleeve 31. The heating frame sleeve 31 is equipped with an air inlet pipe 33 and an air outlet pipe 34 for air intake and exhaust, and the inner walls of the air inlet pipe 33 and the air outlet pipe 34 are equipped with one-way valves. An extension plate is provided on the outside of the heating frame sleeve 31. A servo motor 23 is installed on the top surface of the extension plate, and the output end of the servo motor 23 is fixed to the transmission gear 22. The heating wire 32 generates heat through electrothermal conversion and is evenly transferred to the calcining furnace 1 through the heating frame 31, thereby heating and calcining the gypsum inside the furnace. The one-way valve allows gas to flow in only one direction, effectively preventing backflow of gas in the pipeline. During the calcination process, the inlet pipe 33 is used to provide the necessary combustion gas or protective gas into the calcining furnace 1, while the outlet pipe 34 is used to discharge the waste gas generated during calcination. The one-way valve ensures the orderly flow of these gases and avoids the safety hazards that may be caused by gas backflow. How to control the servo motor 23 and the need for a reducer to drive the calcining furnace when the servo motor 23 rotates are all conventional technical means in this field, and therefore will not be elaborated on in detail.This invention utilizes a linkage structure 2 and a heating structure 3 in conjunction. During calcination, a screw feeder transports raw materials into the hopper 4. A servo motor 23 drives the transmission gears, rotating gear 21, and calcination furnace 1 to rotate. A connecting rod drives the first sprocket 25, the first chain 26, and the second sprocket 27 to rotate, further driving the first and second chain drive structures to rotate. Finally, two dispersing rods rotate synchronously at high speed, dispersing the material entering the hopper 4 and reducing the problem of lumpy gypsum clogging the hopper 4. The dispersed gypsum enters the calcination furnace 1, where the centrifugal force generated by the rotation of the furnace effectively lifts the lumpy gypsum, improving calcination efficiency and uniformity. Simultaneously, the heating wire 32 rapidly heats up upon receiving an electrical signal, and its heat is quickly transferred to the interior of the heating frame 31 through efficient electrical conduction, then evenly radiates throughout the entire calcination furnace 1 space, ensuring that the gypsum inside the furnace receives stable heat, thereby greatly improving the quality of gypsum calcination. The first and second chain drive structures are specifically sprockets and chains, which transmit rotational force. In this invention, the servo motor 23 rotates, driving the transmission gear 22 and the connecting rod to rotate, and further driving the first sprocket 25, the first chain 26, and the second sprocket 27 to rotate. The second sprocket 27 drives the second chain drive structure and further drives the first chain drive structure, thereby driving the two disintegrating rods to rotate synchronously at high speed. During this process, since the diameter of the first sprocket 25 is larger than that of the second sprocket 27, the rotational speed of the second sprocket 27 is faster than that of the first sprocket 25. The positional relationship and connection relationship between the first and second chain drive structures, the second sprocket 27, and the disintegrating rods can be clearly seen from the accompanying drawings.

[0023] The working steps of this utility model are as follows: First, the raw material is conveyed into the hopper 4 through the feed port of the external screw feeder. At this time, the servo motor 23 starts and drives the transmission gear 22 to mesh with the rotating gear 21, driving the calcining furnace 1 to rotate. At the same time, the connecting rod drives the first sprocket 25 to rotate, and drives the second sprocket 27 to rotate at high speed through the chain (because the diameter of the first sprocket 25 is larger than that of the second sprocket 27, the speed is increased). The second sprocket 27 drives the two dispersing rods in the hopper 4 to rotate synchronously at high speed through the two chain transmission structures, breaking up the blocky gypsum and avoiding the feed port blockage. The dispersed material falls into the calcining furnace 1. The centrifugal force generated by the rotation of the furnace body throws it up, enhancing the contact with the hot airflow. At the same time, the heating wire 32 is connected to the power to heat up. The heat is evenly radiated into the furnace through the heating frame sleeve 31. Gas is introduced through the air inlet pipe 33 (the one-way valve ensures that the airflow flows in one direction), and the exhaust pipe 34 discharges the waste gas.

[0024] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An environmentally friendly phosphogypsum calciner, characterized by, The calcining furnace (1) includes a linkage structure (2) and a heating structure (3) assembled outside the calcining furnace (1). A feeding hopper (4) connected to the right side of the calcining furnace (1) is provided therewith. The linkage structure (2) includes a rotating gear (21) installed in the middle of the calcining furnace (1) and a transmission gear (22) meshing with the outer wall of the rotating gear (21). A servo motor (23) is located to the left of the transmission gear (22). A connecting rod is fixedly connected to one end of the transmission gear (22) away from the servo motor (23). A first sprocket (25) is fixedly connected to the other end of the connecting rod. A first chain (26) is meshed with the outside of the first sprocket (25). A second sprocket (27) is also meshed with the inner wall of the first chain (26). Two crushing rods (28) are symmetrically distributed inside the feeding hopper (4).

2. The environmentally friendly phosphogypsum calciner according to claim 1, characterized in that, A first chain drive structure is provided between the two breaking rods (28), and a second chain drive structure is provided between the first chain drive structure and the second sprocket (27). A blocking frame (29) for blocking external damage is provided on the outside of the first chain drive structure, the second chain drive structure, the first sprocket (25), the first chain (26), and the second sprocket (27).

3. The environmentally friendly phosphogypsum calciner according to claim 1, characterized in that, The heating structure (3) includes a heating frame (31) rotatably connected to the outside of the calcining furnace (1) via a bearing and a heating wire (32) installed inside the heating frame (31).

4. The environmentally friendly phosphogypsum calciner according to claim 3, characterized in that, The heating frame (31) is provided with an air inlet pipe (33) and an air outlet pipe (34) for air intake and exhaust, and the inner walls of the air inlet pipe (33) and the air outlet pipe (34) are provided with one-way valves.

5. The environmentally friendly phosphogypsum calciner according to claim 3, characterized in that: An extension plate is provided on the outside of the heating frame sleeve (31), the servo motor (23) is installed on the top surface of the extension plate, and the output end of the servo motor (23) is fixedly connected to the transmission gear (22).

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