A system for efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior.

Abstract

This utility model relates to the field of waste heat utilization equipment technology, and provides a system for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior. The system includes a jacket for accommodating the material to be heated. A first cylindrical body is provided inside the jacket, dividing the interior of the jacket into at least one inner conveying channel and an outer conveying channel. The inner conveying channel is fitted onto the outside of the main kiln body, and the outer conveying channel is fitted onto the outside of the inner conveying channel. A first notch is constructed at the first end of the first cylindrical body, and a second notch is constructed at the second end. The first end of the inner conveying channel and the first end of the outer conveying channel are connected through the first notch. The second end of the inner conveying channel and the second end of the outer conveying channel are connected through the second notch. This system for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior allows the material to circulate between the inner and outer conveying channels, ensuring sufficient heating of the material.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization equipment technology, and in particular to a system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln. Background Technology

[0002] In related technologies, in order to improve the thermal efficiency of heating devices such as the main kiln body, the waste heat lost from the main kiln body is usually used for the heat treatment of other materials. Existing waste heat utilization devices are difficult to fully heat the materials to meet the processing and production needs of the materials. Utility Model Content

[0003] This utility model provides a system for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior, which solves the problem that existing waste heat utilization devices cannot fully heat materials to meet the processing and production needs of the materials.

[0004] This utility model provides a system for efficiently calcining modified phosphogypsum using waste heat from the main kiln exterior, comprising:

[0005] A jacket is used to contain material to be heated. A first cylindrical layer is provided inside the jacket, dividing the interior of the jacket into at least one inner conveying channel and one outer conveying channel. The inner conveying channel is configured to be fitted onto the outside of the main kiln body, and the outer conveying channel is fitted onto the outside of the inner conveying channel. A first notch is formed at the first end of the first cylindrical layer, and a second notch is formed at the second end of the first cylindrical layer. The first end of the inner conveying channel and the first end of the outer conveying channel are connected through the first notch, and the second end of the inner conveying channel and the second end of the outer conveying channel are connected through the second notch. The inner and outer conveying channels are used to circulate the material between the inner and outer conveying channels.

[0006] According to the present invention, the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln has multiple internal material conveying channels.

[0007] Multiple internal conveying channels are fitted around the outside of the main kiln body and are stacked radially along the main kiln body; the second ends of adjacent internal conveying channels are interconnected, and the second end of the outermost internal conveying channel is also connected to the second end of the external conveying channel.

[0008] According to the present invention, the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln is provided with an interface at the second end of the jacket. The interface is connected to the second end of the inner conveying channel and the second end of the outer conveying channel, respectively. The interface is used to connect with the feed hopper and / or storage bin.

[0009] The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln according to this utility model also includes a drive component, which is disposed in the jacket. The drive component is used to drive the material from the second end to the first end of the external conveying channel, and to drive the material from the first end to the second end of the internal conveying channel.

[0010] According to the present invention, the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior includes the following drive components:

[0011] A driving component is connected to the clamping sleeve to drive the clamping sleeve to rotate;

[0012] The fourth spiral plate is spirally wound around the inner material conveying channel along the axial direction of the main kiln body to form a fourth spiral channel in the inner material conveying channel;

[0013] The first spiral plate is spirally wound around the external material conveying channel along the axial direction of the main kiln body to form a first spiral channel in the external material conveying channel;

[0014] The fourth spiral plate and the first spiral plate rotate in opposite directions; the fourth spiral plate is used to drive the material to move along the fourth spiral channel under the drive of the driving member; the first spiral plate is used to drive the material to move along the first spiral channel under the drive of the driving member.

[0015] The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln according to this utility model also includes a material hook plate.

[0016] The external material conveying channel is further provided with a second spiral plate at the position corresponding to the first notch, so as to form a second spiral channel communicating with the first spiral channel;

[0017] The internal material conveying channel is further provided with a third spiral plate at the position corresponding to the first notch, so as to form a third spiral channel communicating with the first spiral channel;

[0018] The material hook plate is disposed in the second spiral channel and extends radially along the second spiral channel to guide the material from the second spiral channel into the third spiral channel;

[0019] The first and second spiral plates have the same direction of rotation; the third and fourth spiral plates have opposite directions of rotation to the second spiral plate.

[0020] According to the present invention, the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln is provided. The hook plate includes a first hook plate, a second hook plate, a third hook plate, and a fourth hook plate. The first hook plate, the second hook plate, the third hook plate, and the fourth hook plate are arranged at intervals along the transport direction of the material to be heated. The dimensions of the first hook plate, the second hook plate, the third hook plate, and the fourth hook plate increase sequentially along the radial direction of the second spiral channel.

[0021] According to the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln of this utility model, there are multiple fourth spiral plates, which are arranged at intervals along the axial direction of the main kiln body to form multiple fourth spiral channels.

[0022] According to the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln of this utility model, there are multiple first spiral plates, which are arranged at intervals along the axial direction of the main kiln body to form multiple first spiral channels.

[0023] According to the present invention, the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln body has the second end of the external material conveying channel extending outward along the axial direction of the main kiln body relative to the second end of the internal material conveying channel.

[0024] This utility model relates to a system for energy-efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior. By installing a jacket around the main kiln body, with internal and external material conveying channels for accommodating materials, the system can simultaneously utilize the diffused heat from the kiln exterior to treat phosphogypsum or other materials requiring dehydration, drying, and calcination in an energy-saving and carbon-reducing manner during normal high-temperature calcination of inorganic or organic materials. This improves the overall thermal efficiency of the system. Furthermore, the two ends of the internal and external material conveying channels can be connected through two notches on the first-layer cylinder to form a circulating movement path, allowing the material to circulate between the internal and external channels, ensuring sufficient heating. This effectively solves the problem in existing waste heat utilization devices that struggle to adequately heat materials to meet processing and production requirements. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 from these drawings without creative effort.

[0026] Figure 1This is one of the schematic diagrams of a system for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior, provided in an embodiment of this utility model.

[0027] Figure 2 This is the second schematic diagram of the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior, provided in this embodiment of the utility model.

[0028] Figure 3 This is a partial structural diagram of the first end of the inner conveying channel and the first end of the outer conveying channel provided in this embodiment of the utility model.

[0029] Figure 4 This is a schematic diagram of the material hook plate provided in an embodiment of this utility model.

[0030] Figure label:

[0031] 1. Main kiln body;

[0032] 2. Jacket; 21. Inner conveying channel; 22. Outer conveying channel; 23. Fourth spiral plate; 24. First spiral plate; 25. Hook plate; 26. First layer cylinder; 27. Second spiral plate; 28. Third spiral plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] The following is combined Figures 1-4 This invention describes a system for the energy-efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior.

[0035] like Figures 1 to 3 As shown, in some embodiments, this utility model provides a system for energy-efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior, comprising: a jacket 2 for accommodating the material to be heated. A first cylindrical body 26 is disposed within the jacket 2, dividing the interior of the jacket 2 into at least one inner conveying channel 21 and one outer conveying channel 22. The inner conveying channel 21 is fitted onto the outside of the main kiln body 1, and the outer conveying channel 22 is fitted onto the outside of the inner conveying channel 21. A first notch is formed at the first end of the first cylindrical body 26, and a second notch is formed at the second end of the first cylindrical body 26. The first end of the inner conveying channel 21 and the first end of the outer conveying channel 22 are connected through the first notch. The second end of the inner conveying channel 21 and the second end of the outer conveying channel 22 are connected through the second notch.

[0036] In this embodiment, the main kiln body 1 is used to calcine materials such as ceramsite and cement. A jacket 2 is installed outside the main kiln body 1, forming an inner conveying channel 21 and an outer conveying channel 22. Both the inner and outer conveying channels 21 and 22 can be used to hold materials to be heated (such as gypsum). The jacket 2 can utilize the residual heat radiated from the surface of the main kiln body 1 to heat-treat the materials within the inner and outer conveying channels 21 and 22 to obtain the desired product. For example, phosphogypsum can be calcined to produce various types of gypsum powder. The inner conveying channel 21 is attached to the outer wall of the main kiln body 1 to directly receive the residual heat radiated from its surface, while the outer conveying channel 22 receives the heat transferred from the inner conveying channel 21.

[0037] Specifically, the inner conveying channel 21 and the outer conveying channel 22 are separated by a first layer of cylinder 26. The first end of the inner conveying channel 21 and the first end of the outer conveying channel 22 are connected by a first notch at the end of the first layer of cylinder 26, and the second end of the inner conveying channel 21 and the second end of the outer conveying channel 22 are connected by a second notch at the other end of the first layer of cylinder 26. It can be understood that a drive mechanism for moving materials can be provided on the inner walls of the inner conveying channel 21 and the outer conveying channel 22 to move the materials along the conveying channels (e.g., by installing a transmission belt within the conveying channels), allowing the materials to circulate and move between the inner conveying channel 21 and the outer conveying channel 22 for heating (the material's movement path is as follows). Figure 2 (As shown by the middle arrow), this allows the material to circulate between the inner conveying channel 21 and the outer conveying channel 22, ensuring thorough heating.

[0038] This utility model relates to a system for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln body 1. A jacket 2 is installed outside the main kiln body 1, containing an inner conveying channel 21 and an outer conveying channel 22 for accommodating materials. During normal high-temperature calcination of inorganic or organic materials, the main kiln body 1 can utilize the diffused heat energy from outside the kiln body to simultaneously treat phosphogypsum or other materials to be dehydrated, dried, and calcined in an energy-saving and carbon-reducing manner, thus improving the overall thermal efficiency of the system. Simultaneously, the two ends of the inner conveying channel 21 and the outer conveying channel 22 of the jacket 2 can be connected through two notches on the first layer of the cylinder 26 to form a circulating movement path, allowing the material to circulate between the inner and outer conveying channels 21 and 22, ensuring sufficient heating. This effectively solves the deficiency in existing waste heat utilization devices where it is difficult to fully heat materials to meet the processing and production requirements.

[0039] It is understandable that one or more internal material conveying channels 21 can be set according to actual production needs, thereby forming a double-layer or multi-layer heating structure with the external material conveying channel 22.

[0040] Specifically, in some embodiments, there are multiple internal conveying channels 21. These multiple internal conveying channels 21 are all fitted onto the outer side of the main kiln body 1 and are stacked radially along the main kiln body 1. The second ends of adjacent internal conveying channels 21 are interconnected, and the second end of the outermost internal conveying channel 21 is also connected to the second end of the outer conveying channel 22.

[0041] In this embodiment, by setting up multiple stacked inner conveying channels 21, the material can circulate between the multiple inner conveying channels 21 and the outer conveying channel 22.

[0042] Optionally, in some embodiments, the jacket 2 is further provided with a feed inlet and a discharge outlet. The feed inlet is connected to the inner conveying channel 21 or the outer conveying channel 22, and the discharge outlet is connected to the inner conveying channel 21 or the outer conveying channel 22. The feed inlet is used to connect to the feed hopper so as to introduce the material to be heated into the jacket 2, and the discharge outlet is used to connect to the storage bin so as to discharge the heated material into the storage bin.

[0043] In some embodiments, such as Figure 1 and Figure 2 As shown, the second end of the jacket 2 is provided with an interface, which is connected to the second end of the inner conveying channel 21 and the second end of the outer conveying channel 22 respectively. The interface is used to connect with the feed hopper and / or storage bin.

[0044] In this embodiment, interfaces are provided on the jacket 2 that connect to the inner conveying channel 21 and the outer conveying channel 22, respectively. These interfaces are used to connect to external structures (such as a feed hopper and a storage bin) to transfer materials between the jacket 2 and external equipment. For example, the interface can connect to the feed hopper to allow material to be heated to be fed into the jacket 2. After heating is completed, the interface can connect to the storage bin to discharge the heated material into the storage bin.

[0045] Understandably, the interface can also be connected to the feed hopper and storage bin via other adapter structures.

[0046] Alternatively, when heating the material, the interface can also be connected to a sealing element to seal the jacket 2.

[0047] Specifically, in some embodiments, the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln also includes a drive component. The drive component is disposed in the jacket 2 and is used to drive the material from the second end of the external conveying channel 22 to the first end, and to drive the material from the first end of the internal conveying channel 21 to the second end.

[0048] In this embodiment, a driving component is provided within the jacket 2 to drive the material to circulate and be heated within the inner conveying channel 21 and the outer conveying channel 22. Specifically, the material is transported from the second end to the first end of the outer conveying channel 22 under the drive of the driving component, and enters the first end of the inner conveying channel 21 through the first notch on the first layer cylinder 26. Then, it moves from the first end of the inner conveying channel 21 to the second end, and enters the second end of the outer conveying channel 22 through the second notch on the first layer cylinder 26, forming a cycle.

[0049] Specifically, in some embodiments, such as Figure 2 and Figure 3 As shown, the driving assembly includes: a driving element (not shown), a fourth spiral plate 23, and a first spiral plate 24. The driving element and the jacket 2 are connected by a drive mechanism to drive the jacket 2 to rotate. The fourth spiral plate 23 is spirally wound along the axial direction of the main kiln body 1 within the inner material conveying channel 21 to form a fourth spiral channel within the inner material conveying channel 21. The first spiral plate 24 is spirally wound along the axial direction of the main kiln body 1 within the outer material conveying channel 22 to form a first spiral channel within the outer material conveying channel 22. The spiral directions of the fourth spiral plate 23 and the first spiral plate 24 are opposite. The fourth spiral plate 23 is used to move the material along the fourth spiral channel under the drive of the driving element; the first spiral plate 24 is used to move the material along the first spiral channel under the drive of the driving element.

[0050] In this embodiment, the driving component is used to drive the jacket 2 to rotate. During the rotation of the jacket 2, the first spiral plate 24 can push the material in the outer conveying channel 22, causing the material to move along the first spiral channel from the second end to the first end of the outer conveying channel 22. At the same time, during the rotation of the jacket 2, the fourth spiral plate 23 can push the material in the inner conveying channel 21 to move along the fourth spiral channel. The fourth spiral plate 23 and the first spiral plate 24 rotate in opposite directions, so that the fourth spiral plate 23 can move the material along the fourth spiral channel from the first end to the second end of the outer conveying channel 22.

[0051] For example, in some specific embodiments, the driving component is connected to the main kiln body 1 to drive the main kiln body 1 to rotate, thereby driving the main kiln body 1 and the external jacket 2 and the cylinder 3 to rotate synchronously. During the rotation, the fourth spiral plate 23 and the first spiral plate 24 inside the jacket 2 can drive the material to move within the jacket 2.

[0052] Specifically, in some embodiments, such as Figure 3 and Figure 4As shown, the system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat from the main kiln exterior also includes a material hook plate 25; a second spiral plate 27 is also provided in the external material conveying channel 22 at the position corresponding to the first notch to form a second spiral channel communicating with the first spiral channel. A third spiral plate 28 is also provided in the internal material conveying channel 21 at the position corresponding to the first notch to form a third spiral channel communicating with the fourth spiral channel. The inner peripheral wall of the second spiral channel and the outer peripheral wall of the third spiral channel are connected. The material hook plate 25 is disposed in the second spiral channel and extends radially along the second spiral channel to guide the material from the second spiral channel into the third spiral channel. The first spiral plate 24 and the second spiral plate 27 have the same rotation direction; the rotation directions of the third spiral plate 28 and the fourth spiral plate 23 are opposite to the rotation direction of the second spiral plate 27.

[0053] In this embodiment, a second spiral plate 27 is provided near the first end of the external material conveying channel 22 to form a second spiral channel that communicates with the first spiral channel. This allows the material in the external material conveying channel 22 to enter the second spiral channel after passing through the first spiral channel. The second spiral channel is provided with a radially extending hook plate 25. When the entire jacket 2 rotates to a certain angle, the hook plate 25 can scoop the material in the second spiral channel through the first notch to the third spiral channel. The second and third spiral channels are in opposite directions, thereby allowing the material entering the third spiral channel to move along the third spiral channel into the fourth spiral channel.

[0054] Specifically, in some embodiments, the pitches of the second spiral plate 27 and the third spiral plate 28 are equal, the pitches of the first spiral plate 24 and the fourth spiral plate 23 are equal, and the pitch of the former is greater than the pitch of the latter.

[0055] Specifically, in some embodiments, such as Figure 3 and Figure 4 As shown, the hook plate 25 includes a first hook plate, a second hook plate, a third hook plate and a fourth hook plate. The first hook plate, the second hook plate, the third hook plate and the fourth hook plate are arranged at intervals along the material transport direction. The dimensions of the first hook plate, the second hook plate, the third hook plate and the fourth hook plate increase sequentially along the radial direction of the second spiral channel.

[0056] In this embodiment, by sequentially arranging the first hook plate, the second hook plate, the third hook plate, and the fourth hook plate along the material transport direction in the first spiral channel, the material moves through the first hook plate, the second hook plate, the third hook plate, and the fourth hook plate in sequence when it moves in the second spiral channel. It can be understood that the dimensions of the first hook plate, the second hook plate, the third hook plate, and the fourth hook plate gradually increase along the radial direction of the second spiral channel, so as to gradually guide the material into the inner conveying channel 21, and finally allow the material to enter the first end of the inner conveying channel 21 from the first end of the outer conveying channel 22.

[0057] Specifically, in some embodiments, there may be multiple fourth spiral plates 23, which are arranged at intervals along the axial direction of the main kiln body 1 to form multiple fourth spiral channels.

[0058] In this embodiment, by setting multiple fourth spiral plates 23, a fourth spiral channel is formed between two adjacent fourth spiral plates 23. Multiple fourth spiral channels can be used for material movement, so that the material can be evenly dispersed in the inner conveying channel 21, and the material is heated more evenly.

[0059] Specifically, in some embodiments, there may be multiple first spiral plates 24, which are arranged at intervals along the axial direction of the main kiln body 1 to form multiple first spiral channels.

[0060] In this embodiment, by setting multiple first spiral plates 24, a first spiral channel is formed between two adjacent first spiral plates 24. Multiple first spiral channels can be used for material movement, so that the material can be evenly dispersed in the inner conveying channel 21, and the material is heated more evenly.

[0061] It is understandable that the fourth spiral channel and the first spiral channel can be set in a one-to-one correspondence, with the first end of the fourth spiral channel connected to the first end of the corresponding first spiral channel, and the second end of the fourth spiral channel connected to the second end of the corresponding first spiral channel.

[0062] It is understandable that the fourth spiral channel and the first spiral channel can be set in a one-to-one correspondence, with the first end of the fourth spiral channel connected to the first end of the corresponding first spiral channel, and the second end of the fourth spiral channel connected to the second end of the corresponding first spiral channel.

[0063] Specifically, in some embodiments, such as Figure 2 As shown, the second end of the external material conveying channel 22 extends outward along the axial direction of the main kiln body 1 relative to the second end of the internal material conveying channel 21.

[0064] In this embodiment, by extending the second end of the external conveying channel 22 outward relative to the second end of the internal conveying channel 21 along the axial direction of the main kiln body 1, when the cylinder 3 and the jacket 2 are separated, the material in the internal conveying channel 21 can move outward from the second end and then enter the external conveying channel 22, and move in the opposite direction to the first end under the action of the first spiral plate 24 in the external conveying channel 22.

[0065] In some embodiments, a heat insulation layer is provided on the outside of the jacket 2 to prevent heat from dissipating outward from the jacket 2.

[0066] Optionally, in some embodiments, the jacket 2 is provided with a first vent hole communicating with the inner material conveying channel 21 and a second vent hole communicating with the outer material conveying channel 22, and both the first vent hole and the second vent hole are provided with vent valves.

[0067] In this embodiment, a first vent hole and a second vent hole are provided on the jacket 2, and an exhaust valve is provided in the first vent hole and the second vent hole. The exhaust valve can be used to discharge the gas generated during the calcination process of the material.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A system device for calcining and modifying phosphogypsum outside a main kiln body with waste heat energy saving and high efficiency, characterized in that, include: A jacket is used to contain material to be heated. A first cylindrical layer is provided inside the jacket, dividing the interior of the jacket into at least one inner conveying channel and one outer conveying channel. The inner conveying channel is configured to be fitted onto the outside of the main kiln body, and the outer conveying channel is fitted onto the outside of the inner conveying channel. A first notch is formed at the first end of the first cylindrical layer, and a second notch is formed at the second end of the first cylindrical layer. The first end of the inner conveying channel and the first end of the outer conveying channel are connected through the first notch, and the second end of the inner conveying channel and the second end of the outer conveying channel are connected through the second notch. The inner and outer conveying channels are used to circulate the material between the inner and outer conveying channels.

2. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 1, characterized in that, The internal material conveying channels are multiple; Multiple internal conveying channels are fitted around the outside of the main kiln body and are stacked radially along the main kiln body; the second ends of adjacent internal conveying channels are interconnected, and the second end of the outermost internal conveying channel is also connected to the second end of the external conveying channel.

3. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 1, characterized in that, The second end of the jacket is provided with an interface, which is connected to the second end of the inner conveying channel and the second end of the outer conveying channel respectively. The interface is used to connect with the feed hopper and / or storage bin.

4. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 1, characterized in that, It also includes a drive assembly disposed in the jacket, the drive assembly being used to drive the material from the second end of the external conveying channel to the first end, and to drive the material to move from the first end of the internal conveying channel to the second end.

5. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 4, characterized in that, The driving component includes: A driving component is connected to the clamping sleeve to drive the clamping sleeve to rotate; The fourth spiral plate is spirally wound around the inner material conveying channel along the axial direction of the main kiln body to form a fourth spiral channel in the inner material conveying channel; The first spiral plate is spirally wound around the external material conveying channel along the axial direction of the main kiln body to form a first spiral channel in the external material conveying channel; The fourth spiral plate and the first spiral plate rotate in opposite directions; the fourth spiral plate is used to drive the material to move along the fourth spiral channel under the drive of the driving member; the first spiral plate is used to drive the material to move along the first spiral channel under the drive of the driving member.

6. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 5, characterized in that, It also includes a hook plate; The external material conveying channel is further provided with a second spiral plate at the position corresponding to the first notch, so as to form a second spiral channel communicating with the first spiral channel; The internal material conveying channel is further provided with a third spiral plate at the position corresponding to the first notch, so as to form a third spiral channel communicating with the first spiral channel; The material hook plate is disposed in the second spiral channel and extends radially along the second spiral channel to guide the material from the second spiral channel into the third spiral channel; The first and second spiral plates have the same direction of rotation; the third and fourth spiral plates have opposite directions of rotation to the second spiral plate.

7. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 6, characterized in that, The material hook plate includes a first material hook plate, a second material hook plate, a third material hook plate, and a fourth material hook plate. The first material hook plate, the second material hook plate, the third material hook plate, and the fourth material hook plate are arranged at intervals along the transport direction of the material to be heated. The dimensions of the first material hook plate, the second material hook plate, the third material hook plate, and the fourth material hook plate increase sequentially along the radial direction of the second spiral channel.

8. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 5, characterized in that, There are multiple fourth spiral plates, which are arranged at intervals along the axial direction of the main kiln body to form multiple fourth spiral channels.

9. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 5, characterized in that, There are multiple first spiral plates, which are arranged at intervals along the axial direction of the main kiln body to form multiple first spiral channels.

10. The system equipment for energy-saving and efficient calcination of modified phosphogypsum using waste heat outside the main kiln as described in claim 5, characterized in that, The second end of the external material conveying channel extends outward along the axial direction of the main kiln body relative to the second end of the internal material conveying channel.

Images