Horizontal fluidized drying and roasting device

Abstract

A horizontal fluidized drying and roasting device comprises an outer furnace body, an inner furnace tube and a rotary driving mechanism. The inner furnace tube is sleeved with the outer furnace body and extends in the axial direction of the outer furnace body. The feeding end of the inner furnace tube is arranged on the axial side wall of the outer furnace body through a rotary driving mechanism and communicated with the outside, and the discharging end of the inner furnace tube is located in the outer furnace body and a gap is reserved between the discharging end of the inner furnace tube and the other axial side wall of the outer furnace body. And in the area where the space is located, a first fluidized gas inlet is formed in the bottom wall of the outer furnace body, and a first fluidized gas outlet is formed in the top wall of the outer furnace body. The inner furnace tube is transversely arranged in the outer furnace body, dehydration and roasting of limonite are separated, efficiency in the roasting process is improved, and fuel is saved. The inner furnace tube is further divided into multiple sections, separation of materials with different particle sizes is achieved, material particle size grading and further refining of roasting can be achieved by controlling roasting time and / or temperature of different areas, and roasting efficiency is improved while fuel is saved.

Description

Technical Field

[0001] The utility model relates to a drying and roasting device, in particular to a horizontal fluidized drying and roasting device, belonging to the technical field of iron ore roasting equipment. Background Art

[0002] Limonite, composed of Fe₂O₃-nH₂O, generally contains 30-40% Fe. It is not actually a single mineral, but rather a mixture of iron hydroxides, such as goethite, containing hydrous silica and mud, resulting in a wide range of compositional variations. It often appears in massive, earthy, stalactite, or grape-like forms. Its color is yellowish-brown or dark brown, with yellowish-brown streaks. Its luster is dull, and its hardness varies depending on its composition and form. Silicon-rich, dense, massive forms can reach a hardness of 5.5, while mud-rich, earthy forms drop to a hardness of 1. Limonite is formed through the oxidation and decomposition of iron-containing minerals, particularly in the surface areas of metallic sulfide deposits. Oxidation often forms limonite. Furthermore, limonite originating from lake and marsh deposits often forms large accumulations. It is often used as a mineral source for iron smelting.

[0003] However, after grinding and selection, the particle size of limonite varies. During the fluidized magnetization roasting process, due to the uneven particle size, there are coarse particles and fine particles. The fine particles require a low reaction temperature and a short time during the reduction process, but they still undergo the entire high-temperature reduction process with the overall material, wasting energy.

[0004] At the same time, limonite contains a large amount of crystal water, and the removal rate of crystal water is slow. Limonite is rich in crystal water, and the magnetization roasting reaction requires the removal of crystal water. Conventional gradual heating systems often result in the material running to the middle of the furnace tube before the crystal water is completely removed, which affects the timely implementation of the magnetization roasting reaction. Utility Model Content

[0005] To address the existing problems of uneven particle size after limonite grinding, which easily leads to energy waste, and slow crystal water removal, which affects the progress of magnetized roasting, the present invention proposes a horizontal fluidized drying and roasting device. This device incorporates an inner furnace tube within the outer furnace body. After the crystal water is removed from the limonite in the inner furnace tube, fluidized roasting is performed, achieving early dehydration, avoiding any impact on the roasting process, saving energy, and improving roasting efficiency.

[0006] According to an embodiment of the present utility model, a horizontal fluidized drying and roasting device is provided.

[0007] A horizontal fluidized bed drying and roasting device comprises an outer furnace body, an inner furnace tube, and a rotary drive mechanism. The inner furnace tube is sleeved within the outer furnace body and extends axially along the outer furnace body. The feed end of the inner furnace tube is positioned on an axial sidewall of the outer furnace body via the rotary drive mechanism and communicates with the outside world. The discharge end of the inner furnace tube is located within the outer furnace body and spaced apart from the other axial sidewall of the outer furnace body.

[0008] In the area where the gap is located: a first fluidizing gas inlet is opened on the bottom wall of the outer furnace body, and a first fluidizing gas outlet is opened on the top wall of the outer furnace body.

[0009] Preferably, the inner furnace tube includes a preheating section and a material distribution section connected in series along the material flow path within the inner furnace tube. The material distribution section is provided with a plurality of material distribution holes. A second fluidizing gas inlet is provided on the bottom wall of the outer furnace body corresponding to the material distribution section, and a second fluidizing gas outlet is provided on the top wall of the outer furnace body corresponding to the material distribution section.

[0010] Preferably, a preheating gas inlet is provided on the bottom wall of the outer furnace body corresponding to the preheating section, and a preheating gas outlet is provided on the top wall of the outer furnace body corresponding to the preheating section.

[0011] Preferably, along the direction of the material in the inner furnace tube, the material distribution section includes a plurality of material distribution segments connected in series. Preferably, the number of the material distribution segments is 2 to 8.

[0012] Preferably, the diameters of the distribution holes gradually increase in the plurality of distribution segments along the direction of the material in the inner furnace tube.

[0013] Preferably, along the direction of the material in the inner furnace tube, the material distribution section includes three material distribution sections connected in series, namely material distribution section 1, material distribution section 2, and material distribution section 3. The diameter of the material distribution hole of the material distribution section 1 is 0.5-2 mm, the diameter of the material distribution hole of the material distribution section 2 is 2-4 mm, and the diameter of the material distribution hole of the material distribution section 3 is 4-8 mm. Preferably, the diameter of the material distribution hole of the material distribution section 1 is 0.8-1.5 mm, the diameter of the material distribution hole of the material distribution section 2 is 2.5-3.5 mm, and the diameter of the material distribution hole of the material distribution section 3 is 5-7 mm.

[0014] Preferably, the device further comprises a partition. The partition is arranged perpendicular to the center line of the inner furnace tube and is located at the connection between two adjacent different segments of the inner furnace tube and at the discharge end of the inner furnace tube. The partition connects the outer wall of the inner furnace tube and the inner wall of the outer furnace body, and divides the space between the inner furnace tube and the outer furnace body into n+1 independent areas, where n is the number of segments of the inner furnace tube, and the bottom and top of the outer furnace body corresponding to each independent area are respectively provided with independent gas inlet and gas outlet. Here, the gas inlet and gas outlet refer to the general term for the gas inlet and outlet corresponding to each independent area. For example, the area where the preheating section is located is correspondingly provided with a preheating gas inlet and a preheating gas outlet, the area where the material distribution section is located is correspondingly provided with a second fluidized gas inlet and a second fluidized gas outlet, and the area where the spacing is located is correspondingly provided with a first fluidized gas inlet and a first fluidized gas outlet.

[0015] Preferably, the device further comprises a gas circulation conduit, one end of which is connected to the first fluidizing gas outlet and / or the second fluidizing gas outlet, and the other end of which is connected to the preheating gas inlet. The gas circulation conduit is provided with a gas-material separation mechanism.

[0016] Preferably, the preheating gas outlet is connected to the waste heat utilization mechanism through a waste heat pipeline.

[0017] Preferably, the device further comprises a stirring guide plate. The stirring guide plate is disposed on the inner wall of the inner furnace tube and protrudes toward the centerline of the inner furnace tube. Preferably, the protruding height of the stirring guide plate is 1 / 6 to 1 / 2 of the radius of the inner furnace tube, and more preferably 1 / 4 to 1 / 3 of the radius of the inner furnace tube.

[0018] Preferably, the stirring guide plates are discontinuous and evenly distributed within the inner furnace tube. Preferably, the stirring guide plates are discontinuous spiral or triangular structures, preferably discontinuous spiral structures. Preferably, the spiral direction of the stirring guide plates is the same as the rotation direction of the inner furnace tube.

[0019] Preferably, the outer furnace body is a horizontal cylindrical structure or a rectangular parallelepiped structure.

[0020] Preferably, a gas flow monitoring mechanism and / or a temperature monitoring mechanism is provided at the first fluidizing gas inlet and / or the second fluidizing gas inlet.

[0021] Preferably, a humidity detection mechanism is provided at the first fluidizing gas outlet and / or the second fluidizing gas outlet.

[0022] In this utility model, an inner furnace tube is nestled within the outer furnace body. Material enters through the feed end of the inner furnace tube and is heated within the tube to remove crystallized water. Driven by the rotation of the inner furnace tube and the push of new material entering the feed end, the material is discharged from the discharge end of the inner furnace tube to the area defined by the spacing. Fluidizing gas is then introduced through the first fluidizing gas inlet for roasting. This solution separates dehydration and roasting, improving the roasting efficiency of limonite ore.

[0023] In the present invention, the inner furnace tube is further divided into a preheating section and a material distribution section. The tube body of the preheating section is closed, and a material distribution hole is provided on the tube body of the material distribution section, and a second fluidized gas inlet and a second fluidized gas outlet are respectively provided on the bottom and top of the corresponding outer furnace body. After the material enters from the feed end of the inner furnace tube, it is heated in the preheating section, the crystallization water is separated, and water vapor is formed and discharged in the material distribution section. After the water vapor is discharged, the fine material particles can be separated from the large-particle material, and then discharged from the material distribution hole of the material distribution section, and fluidized roasted in the space between the outer wall of the inner furnace tube where the material distribution section is located and the inner wall of the outer furnace body, while the large-particle material is discharged from the discharge end of the inner furnace tube and fluidized roasted in the area where the spacing is located. Through the above scheme, the present invention realizes the separation and roasting of fine-particle material and large-particle material after removing the crystallization water, avoids the whole process of high-temperature reduction of fine particles and overall material, and saves energy.

[0024] In the present invention, the material distribution section is preferably divided into multiple sections, preferably three, and the particle sizes of the distribution holes in the distribution section are arranged in a progressively larger distribution pattern, in accordance with the direction of material movement from front to back. This allows for the separation and roasting of materials in ascending order of particle size. The roasting time and / or temperature of the regions corresponding to the different discharge sections can be controlled, achieving further refinement of material particle size classification and roasting.

[0025] In the present invention, a partition can be added between the inner wall of the outer furnace body and the outer wall of the inner furnace tube. The partition can separate the two adjacent sections, especially the fluidized reaction zones corresponding to different material distribution sections, to prevent the material discharged from a certain material distribution section from entering the fluidized reaction zone corresponding to the adjacent discharge zone. At the same time, the roasting temperature and roasting time in different areas can be better controlled to achieve refined control of material separation and fluidized roasting.

[0026] In this utility model, a stirring guide plate is installed on the inner wall of the inner furnace tube. Once the material enters the inner furnace tube, it is thoroughly mixed by the stirring guide plate and fully dehydrated and dried during the mixing process, avoiding situations where the outer layer of material is fully dehydrated and dried while the inner layer is incompletely dehydrated and dried. Furthermore, the stirring guide plate gradually pushes the material toward the discharge end, achieving uniform and continuous material feeding and discharging, and preventing material blockage.

[0027] In this utility model, the inner furnace tube is arranged horizontally within the outer furnace body. Compared with a vertical arrangement, the horizontal arrangement can process a larger amount of material. At the same time, the horizontal arrangement of the inner furnace tube can further refine the material particle size by dividing the material into sections with different material distribution hole diameters, and achieve precise control of the roasting process by varying the roasting time and / or temperature.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The utility model provides a horizontal fluidized bed drying and roasting device that separates the dehydration and roasting of limonite by disposing an inner furnace tube horizontally within an outer furnace body, thereby improving the efficiency of the roasting process and saving fuel. Furthermore, by further dividing the inner furnace tube into multiple sections, materials of different particle sizes can be separated. By controlling the roasting time and / or temperature of different sections, material particle size classification and further refinement of the roasting can be achieved, thus saving fuel and improving roasting efficiency.

[0030] 2. The utility model provides a horizontal fluidized bed drying and roasting device, which fully mixes the materials by arranging a stirring guide plate in the inner furnace tube, accelerates the dehydration and drying steps, and gradually pushes the materials toward the discharge end, thereby achieving continuous and uniform feeding and discharging and preventing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention provides a schematic structural diagram of a horizontal fluidized drying and roasting device.

[0032] Figure 2 This is a schematic structural diagram of an inner furnace tube in a horizontal fluidized drying and roasting device provided by the utility model.

[0033] Figure 3 This is another structural schematic diagram of a horizontal fluidized drying and roasting device provided by the utility model.

[0034] Figure markings: 1: outer furnace body; 101: first fluidizing gas inlet; 102: first fluidizing gas outlet; 103: second fluidizing gas inlet; 104: second fluidizing gas outlet; 2: inner furnace tube; 201: preheating section; 202: material distribution section; 2021: material distribution segment; 203: material distribution hole; 3: partition; 4: gas circulation pipeline; 5: gas-material separation mechanism; 6: rotary drive mechanism. DETAILED DESCRIPTION

[0035] The technical solutions of the present invention are illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0036] According to an embodiment of the present utility model, a horizontal fluidized drying and roasting device is provided.

[0037] A horizontal fluidized bed drying and roasting device comprises an outer furnace body 1, an inner furnace tube 2, and a rotary drive mechanism 6. The inner furnace tube 2 is sleeved within the outer furnace body 1 and extends axially along the outer furnace body 1. The feed end of the inner furnace tube 2 is positioned on an axial sidewall of the outer furnace body 1 via the rotary drive mechanism 6 and communicates with the outside world. The discharge end of the inner furnace tube 2 is located within the outer furnace body 1 and is spaced apart from the other axial sidewall of the outer furnace body 1.

[0038] In the region where the gap is located: a first fluidizing gas inlet 101 is opened on the bottom wall of the outer furnace body 1 , and a first fluidizing gas outlet 102 is opened on the top wall of the outer furnace body 1 .

[0039] Preferably, the inner furnace tube 2 includes a preheating section 201 and a material distribution section 202 connected in series along the material flow path within the inner furnace tube 2. The material distribution section 202 is provided with a plurality of material distribution holes 203. A second fluidizing gas inlet 103 is provided on the bottom wall of the outer furnace body 1 corresponding to the material distribution section 202, and a second fluidizing gas outlet 104 is provided on the top wall of the outer furnace body 1 corresponding to the material distribution section.

[0040] Preferably, a preheating gas inlet is provided on the bottom wall of the outer furnace body 1 corresponding to the preheating section 201 , and a preheating gas outlet is provided on the top wall of the outer furnace body 1 corresponding to the preheating section 201 .

[0041] Preferably, along the direction of the material in the inner furnace tube 2, the material dividing section 202 includes a plurality of material dividing segments 2021 connected in series. Preferably, the number of the material dividing segments 2021 is 2 to 8.

[0042] Preferably, along the direction of the material in the inner furnace tube 2 , the diameters of the distribution holes 203 in the plurality of distribution segments 2021 gradually increase.

[0043] Preferably, along the direction of the material in the inner furnace tube 2, the material distribution section 202 includes three material distribution segments 2021 connected in series, namely material distribution section 1, material distribution section 2, and material distribution section 3. The diameter of the material distribution hole 203 of the material distribution section 1 is 0.5-2 mm, the diameter of the material distribution hole 203 of the material distribution section 2 is 2-4 mm, and the diameter of the material distribution hole 203 of the material distribution section 3 is 4-8 mm. Preferably, the diameter of the material distribution hole 203 of the material distribution section 1 is 0.8-1.5 mm, the diameter of the material distribution hole 203 of the material distribution section 2 is 2.5-3.5 mm, and the diameter of the material distribution hole 203 of the material distribution section 3 is 5-7 mm.

[0044] Preferably, the device further includes a partition 3. The partition 3 is positioned perpendicular to the centerline of the inner furnace tube 2 and is located at the junction of two adjacent segments of the inner furnace tube 2 and at the discharge end of the inner furnace tube 2. The partition 3 connects the outer wall of the inner furnace tube 2 with the inner wall of the outer furnace body 1, dividing the space between the inner furnace tube 2 and the outer furnace body 1 into n+1 independent regions, where n is the number of segments of the inner furnace tube 2. Each independent region is provided with an independent gas inlet and gas outlet at the bottom and top of the outer furnace body 1, respectively.

[0045] Preferably, the device further comprises a gas circulation conduit 4. One end of the gas circulation conduit is connected to the first fluidizing gas outlet 102 and / or the second fluidizing gas outlet 104, and the other end is connected to the preheating gas inlet. The gas circulation conduit 4 is provided with a gas-material separation mechanism 5.

[0046] Preferably, the preheating gas outlet is connected to the waste heat utilization mechanism through a waste heat pipeline.

[0047] Preferably, the device further comprises a stirring guide plate. The stirring guide plate is disposed on the inner wall of the inner furnace tube 2 and protrudes toward the centerline of the inner furnace tube 2. Preferably, the protruding height of the stirring guide plate is 1 / 6 to 1 / 2 of the radius of the inner furnace tube 2, and more preferably 1 / 4 to 1 / 3 of the radius of the inner furnace tube 2.

[0048] Preferably, the stirring guide plates are discontinuous and evenly distributed within the inner furnace tube 2. Preferably, the stirring guide plates are discontinuous spiral or triangular structures, preferably discontinuous spiral structures. Preferably, the spiral direction of the stirring guide plates is the same as the rotation direction of the inner furnace tube 2.

[0049] Preferably, the outer furnace body 1 is a horizontal cylindrical structure or a rectangular parallelepiped structure.

[0050] Preferably, a gas flow monitoring mechanism and / or a temperature monitoring mechanism is provided at the first fluidizing gas inlet and / or the second fluidizing gas inlet.

[0051] Preferably, a humidity detection mechanism is provided at the first fluidizing gas outlet and / or the second fluidizing gas outlet.

[0052] Example 1

[0053] A horizontal fluidized bed drying and roasting device comprises an outer furnace body 1, an inner furnace tube 2, and a rotary drive mechanism 6. The inner furnace tube 2 is sleeved within the outer furnace body 1 and extends axially along the outer furnace body 1. The feed end of the inner furnace tube 2 is positioned on an axial sidewall of the outer furnace body 1 via the rotary drive mechanism 6 and communicates with the outside world. The discharge end of the inner furnace tube 2 is located within the outer furnace body 1 and is spaced apart from the other axial sidewall of the outer furnace body 1.

[0054] In the region where the gap is located: a first fluidizing gas inlet 101 is opened on the bottom wall of the outer furnace body 1 , and a first fluidizing gas outlet 102 is opened on the top wall of the outer furnace body 1 .

[0055] Example 2

[0056] Example 1 was repeated, except that the inner furnace tube 2 included a preheating section 201 and a material distribution section 202 connected in series, following the material flow in the inner furnace tube 2. Thirty-two material distribution holes 203 were formed in the tube of the material distribution section 202. A second fluidizing gas inlet 103 was formed on the bottom wall of the outer furnace body 1 corresponding to the material distribution section 202, and a second fluidizing gas outlet 104 was formed on the top wall of the outer furnace body 1 corresponding to the material distribution section.

[0057] A preheating gas inlet is provided on the bottom wall of the outer furnace body 1 corresponding to the preheating section 201 , and a preheating gas outlet is provided on the top wall of the outer furnace body 1 corresponding to the preheating section 201 .

[0058] Example 3

[0059] Example 2 is repeated, except that the material distribution section 202 includes three material distribution segments 2021 connected in series along the direction of the material in the inner furnace tube 2.

[0060] Along the flow of the material in the inner furnace tube 2 , the diameters of the distribution holes 203 on the plurality of distribution segments 2021 gradually increase.

[0061] Example 4

[0062] Example 3 was repeated, except that the three material-dividing segments 2021 connected in series were material-dividing segment 1, material-dividing segment 2, and material-dividing segment 3, respectively, along the flow of the material in the inner furnace tube 2. The diameter of the material-dividing holes 203 in material-dividing segment 1 was 1 mm, the diameter of the material-dividing holes 203 in material-dividing segment 2 was 3 mm, and the diameter of the material-dividing holes 203 in material-dividing segment 3 was 6 mm.

[0063] Example 5

[0064] Example 4 was repeated, except that the device also included a partition 3. The partition 3 was positioned perpendicular to the centerline of the inner furnace tube 2 and located at the junction of two adjacent sections of the inner furnace tube 2 and at the discharge end of the inner furnace tube 2. The partition 3 connected the outer wall of the inner furnace tube 2 to the inner wall of the outer furnace body 1, dividing the space between the inner furnace tube 2 and the outer furnace body 1 into four independent areas. Each independent area had a separate gas inlet and gas outlet at the bottom and top of the outer furnace body 1, respectively.

[0065] Example 6

[0066] Example 5 was repeated, except that the apparatus further included a gas circulation conduit 4. One end of the gas circulation conduit was connected to the first fluidizing gas outlet 102 and the second fluidizing gas outlet 104, and the other end was connected to the preheating gas inlet. A gas-material separation mechanism 5 was provided on the gas circulation conduit 4.

[0067] The preheated gas outlet is connected to the waste heat utilization mechanism through a waste heat pipeline.

[0068] Example 7

[0069] Example 6 was repeated, except that the device further included a stirring guide plate. The stirring guide plate was disposed on the inner wall of the inner furnace tube 2 and protruded toward the centerline of the inner furnace tube 2. The protruding height of the stirring guide plate was 1 / 3 of the radius of the inner furnace tube 2.

[0070] Example 8

[0071] Example 7 was repeated, except that the stirring guide plates were of discontinuous spiral structure and were evenly distributed in the inner furnace tube 2. The spiral direction of the stirring guide plates was the same as the rotation direction of the inner furnace tube 2.

[0072] Example 9

[0073] Example 8 is repeated, except that the outer furnace body 1 is a horizontal cylindrical structure.

[0074] Example 10

[0075] Example 9 was repeated, except that a gas flow monitoring mechanism and a temperature monitoring mechanism were provided at the fluidizing gas inlet.

[0076] A humidity detection mechanism is provided at the fluidized gas outlet.

Claims

1. A horizontal fluidized bed drying and roasting device, characterized in that: The device comprises an outer furnace body (1), an inner furnace tube (2) and a rotary drive mechanism (6); the inner furnace tube (2) is sleeved inside the outer furnace body (1) and extends along the axial direction of the outer furnace body (1); the feed end of the inner furnace tube (2) is arranged on the axial side wall of the outer furnace body (1) through the rotary drive mechanism (6) and is connected to the outside, and the discharge end of the inner furnace tube (2) is located inside the outer furnace body (1) and a gap is left between the inner furnace tube (2) and the other axial side wall of the outer furnace body (1); in the area where the gap is located: a first fluidized gas inlet (101) is opened on the bottom wall of the outer furnace body (1), and a first fluidized gas outlet (102) is opened on the top wall of the outer furnace body (1).

2. The device according to claim 1, characterized in that: Along the direction of the material in the inner furnace tube (2), the inner furnace tube (2) includes a preheating section (201) and a material distribution section (202) connected in series; a plurality of material distribution holes (203) are provided on the tube body of the material distribution section (202); a second fluidizing gas inlet (103) is provided on the bottom wall of the outer furnace body (1) corresponding to the material distribution section (202), and a second fluidizing gas outlet (104) is provided on the top wall of the outer furnace body (1) corresponding to the material distribution section (202).

3. The device according to claim 2, characterized in that: A preheating gas inlet is provided on the bottom wall of the outer furnace body (1) corresponding to the preheating section (201), and a preheating gas outlet is provided on the top wall of the outer furnace body (1) corresponding to the preheating section (201).

4. The device according to claim 2, characterized in that: Along the direction of the material in the inner furnace tube (2), the material distribution section (202) includes a plurality of material distribution segments (2021) connected in series.

5. The device according to claim 4, characterized in that: The number of the material distribution segments (2021) is 2 to 8.

6. The device according to claim 4, characterized in that: The diameters of the distribution holes (203) gradually increase on the plurality of distribution segments (2021) along the direction of the material in the inner furnace tube (2).

7. The device according to claim 4, characterized in that: Along the direction of the material in the inner furnace tube (2), the material distribution section (202) includes three material distribution segments (2021) connected in series, namely the material distribution section one, the material distribution section two and the material distribution section three; the diameter of the material distribution hole (203) of the material distribution section one is 0.5-2 mm, the diameter of the material distribution hole (203) of the material distribution section two is 2-4 mm, and the diameter of the material distribution hole (203) of the material distribution section three is 4-8 mm.

8. The device according to claim 7, characterized in that: The diameter of the distribution holes (203) of the first distribution section is 0.8-1.5 mm, the diameter of the distribution holes (203) of the second distribution section is 2.5-3.5 mm, and the diameter of the distribution holes (203) of the third distribution section is 5-7 mm.

9. The device according to any one of claims 2 to 8, characterized in that: The device further comprises a partition (3); the partition (3) is arranged perpendicular to the center line of the inner furnace tube (2) and is located at the connection between two adjacent different sections of the inner furnace tube (2) and at the discharge end of the inner furnace tube (2); the partition (3) connects the outer wall of the inner furnace tube (2) and the inner wall of the outer furnace body (1), and divides the space between the inner furnace tube (2) and the outer furnace body (1) into n+1 independent areas, where n is the number of sections of the inner furnace tube (2), and the bottom and top of the outer furnace body (1) corresponding to each independent area are respectively provided with an independent gas inlet and a gas outlet.

10. The device according to any one of claims 2 to 8, characterized in that: The device further comprises a gas circulation pipeline (4); one end of the gas circulation pipeline is connected to the first fluidized gas outlet (102) and / or the second fluidized gas outlet (104), and the other end is connected to the preheating gas inlet; and a gas-material separation mechanism (5) is provided on the gas circulation pipeline (4).

11. The device according to claim 10, characterized in that: The preheated gas outlet is connected to the waste heat utilization mechanism through a waste heat pipeline.

12. The device according to any one of claims 1 to 8 and 11, characterized in that: The device further comprises a stirring guide plate; the stirring guide plate is arranged on the inner wall of the inner furnace tube (2) and protrudes towards the center line direction of the inner furnace tube (2).

13. The device according to claim 9, characterized in that: The device further comprises a stirring guide plate; the stirring guide plate is arranged on the inner wall of the inner furnace tube (2) and protrudes towards the center line direction of the inner furnace tube (2).

14. The device according to claim 10, characterized in that: The device further comprises a stirring guide plate; the stirring guide plate is arranged on the inner wall of the inner furnace tube (2) and protrudes towards the center line direction of the inner furnace tube (2).

15. The device according to claim 12, characterized in that: The protruding height of the stirring guide plate is 1 / 6 to 1 / 2 of the radius of the inner furnace tube (2).

16. The device according to claim 13, characterized in that: The protruding height of the stirring guide plate is 1 / 6 to 1 / 2 of the radius of the inner furnace tube (2).

17. The device according to claim 14, characterized in that: The protruding height of the stirring guide plate is 1 / 6 to 1 / 2 of the radius of the inner furnace tube (2).

18. The device according to any one of claims 15 to 17, characterized in that: The protruding height of the stirring guide plate is 1 / 4 to 1 / 3 of the radius of the inner furnace tube (2).

19. The device according to claim 12, characterized in that: The stirring guide plates are of a discontinuous structure and are evenly distributed in the inner furnace tube (2).

20. The device according to claim 13, characterized in that: The stirring guide plates are of a discontinuous structure and are evenly distributed in the inner furnace tube (2).

21. The device according to claim 14, characterized in that: The stirring guide plates are of a discontinuous structure and are evenly distributed in the inner furnace tube (2).

22. The device according to any one of claims 19 to 21, characterized in that: The stirring guide plate is a discontinuous spiral structure or a triangular structure.

23. The device according to claim 22, characterized in that: The stirring guide plate is a discontinuous spiral structure.

24. The device according to claim 23, characterized in that: The spiral direction of the stirring guide plate is the same as the rotation direction of the inner furnace tube (2).

25. The device according to any one of claims 1-8, 11, 13-17, 19-21, 23-24, characterized in that: The outer furnace body (1) is a horizontal cylindrical structure or a rectangular parallelepiped structure.

26. The device according to any one of claims 1-8, 11, 13-17, 19-21, 23-24, characterized in that: A gas flow monitoring mechanism and / or a temperature monitoring mechanism is provided at the first fluidizing gas inlet and / or the second fluidizing gas inlet; and / or A humidity detection mechanism is provided at the first fluidizing gas outlet and / or the second fluidizing gas outlet.

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