A dry cooling device

Abstract

A dry cooling device includes an outer cylinder and an inner cylinder. Both the outer and inner cylinders are horizontally arranged cylindrical structures. One end of the inner cylinder has a feed inlet communicating with its inner cavity, and the other end has a discharge outlet communicating with its inner cavity. The inner cylinder is coaxially fitted inside the outer cylinder. A sandwiched chamber is formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder. A cooling medium inlet pipe and a cooling medium outlet pipe communicating with the sandwiched chamber are also provided on the outer cylinder. This invention, by setting up a sandwiched chamber and cooling pipes between the outer and inner cylinders, achieves sufficient cooling of kiln slag through secondary cooling and increased heat exchange area. Furthermore, the cooling medium in the sandwiched chamber is introduced into the cooling pipes, achieving full utilization of the cooling medium and avoiding problems such as high slag moisture content, difficult transportation, and high water consumption.

Description

Technical Field

[0001] This utility model relates to a cooling device, specifically a dry cooling device, belonging to the field of lump ore cooling technology. Background Technology

[0002] Various zinc- and iron-containing dust and sludge from the steel industry, including sintering dust, blast furnace bag filter dust, blast furnace gravity dust, electric furnace dust, steelmaking sludge, and converter dust, have high valuable metal content and high recycling value. Their main chemical components include Fe, Zn, C, Ca, Mg, Si, and Al. Fe and C are the main materials and energy components in steelmaking, while Ca and Mg are solvent components and can be recycled and reused in the steelmaking process. However, because zinc is a harmful element in the steelmaking process, it is not suitable as a direct raw material. Therefore, zinc-containing dust and sludge are usually pre-dezincified before sintering.

[0003] In the existing pretreatment of zinc-containing dust and sludge for zinc removal, the rotary kiln process is usually adopted. After mixing and pelletizing, the slag is subjected to high-temperature roasting in the rotary kiln, and the slag falls from the slag outlet at the kiln head and enters the slag treatment process.

[0004] The slag treatment process generally uses water quenching. High-temperature slag falls from the kiln into the slag flushing chute, is then flushed into the slag flushing pool by water quenching, and is retrieved by a crane grab bucket. This water quenching slag retrieval method can quickly cool the blast furnace slag, with a significant slag cooling effect. However, its disadvantages are also obvious: ① The slag has a high moisture content, making transportation difficult and the working environment along the way is poor. If the slag is utilized, it cannot meet the dry slag requirements of subsequent processes; ② It generates a large amount of water vapor, resulting in a poor on-site environment and high water consumption; ③ The water in the water quenching pool is difficult to treat and requires the use of sedimentation and clarification pools for recycling, which requires a large area and a large amount of civil engineering work; ④ The waste heat of the slag cannot be utilized. Utility Model Content

[0005] To address the problems of high moisture content in water-quenched slag, difficult transportation, high water consumption, and difficult water treatment in existing technologies, this invention proposes a dry cooling device. This device comprises an outer cylinder and an inner cylinder, with a sandwiched chamber between them into which a cooling medium is introduced. Simultaneously, cooling pipes are installed on the inner wall of the inner cylinder, introducing the cooling medium from the sandwiched chamber into these pipes. This achieves thorough cooling of the kiln slag and avoids the problems of high slag moisture content, difficult transportation, and high water consumption.

[0006] According to an embodiment of this utility model, a dry cooling device is provided.

[0007] A dry cooling device includes an outer cylinder and an inner cylinder. Both the outer and inner cylinders are horizontally arranged cylindrical structures. One end of the inner cylinder has an inlet communicating with its inner cavity, and the other end has an outlet communicating with its inner cavity. The inner cylinder is coaxially fitted inside the outer cylinder. A sandwich chamber is formed between the outer side wall of the inner cylinder and the inner side wall of the outer cylinder. The outer cylinder also has a cooling medium inlet pipe and a cooling medium outlet pipe communicating with the sandwich chamber.

[0008] Cooling pipes extending axially are also provided on the inner wall of the inner cylinder. The medium inlet of the cooling pipe is connected to the medium outlet of the jacketed chamber, and the medium outlet of the cooling pipe is connected to the cooling medium output pipe.

[0009] Preferably, the cooling pipe is a straight pipe on the inner wall of the inner cylinder and parallel to the axial direction of the inner cylinder, or a spiral pipe extending circumferentially on the inner wall of the inner cylinder, preferably a spiral pipe extending circumferentially on the inner wall of the inner cylinder.

[0010] Preferably, multiple cooling pipes, preferably 2 to 6, are provided on the inner wall of the inner cylinder.

[0011] Preferably, both the cooling medium inlet pipe and the cooling medium outlet pipe are located on the discharge end side of the inner cylinder.

[0012] Preferably, a guide vane protruding towards the interior of the inner cylinder is fixedly or movably disposed on the cooling pipe. Preferably, the guide vane extends along the length of the cooling pipe.

[0013] Preferably, the device further includes a waste heat recovery mechanism. The medium outlet of the cooling pipe is connected to the heat source inlet of the waste heat recovery mechanism via a cooling medium output pipe. Preferably, the waste heat recovery mechanism is a waste heat boiler.

[0014] Preferably, the outer cylinder and the inner cylinder are inclined with the feed end higher than the discharge end. Preferably, the angle between the outer cylinder and the inner cylinder and the horizontal plane is 1~45°, more preferably 2~30°, and even more preferably 3~15°.

[0015] Preferably, the device further includes a drive mechanism. The drive mechanism includes a drive motor and a gear. The gear is fixed to the outer periphery of the outer cylinder, and the drive motor is connected to the gear.

[0016] Preferably, the device further includes a feeding mechanism. The feeding mechanism includes a feeding pipe, the discharge end of which is connected to the inlet of the inner cylinder. Preferably, the feeding mechanism also includes a frequency detector and a vibrator disposed on the wall of the feeding pipe, the frequency detector being connected to the vibrator. Preferably, the frequency detector is also connected to an alarm.

[0017] Preferably, the device further includes a dust cleaner. The dust cleaner is disposed on the inner wall of the feed pipe. Preferably, a slide rail is provided on the inner wall of the feed pipe, and the dust cleaner is movably disposed on the inner wall of the feed pipe via the slide rail.

[0018] Preferably, the feed water cooler has a hollow structure and is provided with a medium inlet and a medium outlet, and the inner cavity of the feed water cooler is arranged around the outer wall of the feed pipe.

[0019] Preferably, the device further includes a screening mechanism. The screening mechanism includes a screen cylinder and a discharge device. The feed inlet of the screen cylinder is connected to the discharge outlet of the inner cylinder, the small particle material outlet of the screen cylinder is connected to the conveyor, and the large particle material outlet of the screen cylinder is connected to the feed inlet of the converter.

[0020] Preferably, the screening mechanism further includes a gravity flap gate. The gravity flap gate is located at the large particle material outlet of the screen cylinder.

[0021] Preferably, the screening mechanism further includes a negative pressure suction port. The negative pressure suction port is located on the cylinder wall opposite the feed inlet of the screen cylinder.

[0022] In this invention, an outer cylinder and an inner cylinder are provided, with a sandwiched chamber between them. A cooling medium is introduced into this sandwiched chamber. Simultaneously, a cooling pipe is installed on the inner wall of the inner cylinder, introducing the cooling medium from the sandwiched chamber into the cooling pipe. Finally, the cooling medium is discharged from the cooling pipe and enters a cooling medium outlet pipe. This invention achieves sufficient cooling of the kiln slag through secondary cooling and increased heat exchange area. Furthermore, by introducing the cooling medium from the sandwiched chamber into the cooling pipe, it fully utilizes the cooling medium and avoids problems such as high slag moisture content, difficult transportation, and high water consumption.

[0023] In this invention, the cooling pipes can extend linearly along the axial direction on the inner wall of the inner cylinder or extend spirally, both achieving the effect of cooling the material in the inner cylinder. Furthermore, multiple cooling pipes can be used to achieve sufficient cooling of the material in the inner cylinder. Further, both the cooling medium inlet pipe and the cooling medium outlet pipe are located on the discharge end side of the inner cylinder. After the cooling medium is introduced into the jacketed chamber through the cooling medium inlet pipe, the cooling medium flows counter-currently from the tail end of the jacketed chamber to indirectly cool the material, and then enters the cooling pipe for further co-current indirect cooling.

[0024] In this invention, the cooling pipe is preferably designed as a spiral extending along the axial direction on the inner wall of the inner cylinder. During cylinder rotation, the cooling pipe, along with the cylinder, propels the material towards the tail end. Furthermore, guide vanes are provided on the cooling pipe to accelerate the material's movement. Additionally, the guide vanes can be fixedly or movably mounted on the cooling pipe. The movable vanes are detachably mounted.

[0025] In this invention, a waste heat recovery mechanism connected to the cooling medium output pipe is provided to recover and reuse the cooling medium.

[0026] In this utility model, the driving mechanism includes a gear and a drive motor. The gear is fixedly disposed on the outer periphery of the outer cylinder, and the drive motor is connected to the gear and drives the gear to rotate the outer cylinder.

[0027] In this invention, a feed pipe is provided connected to the feed inlet of the inner cylinder. Preferably, a frequency detector and a vibrator are installed on the feed pipe. When the frequency detector detects an abnormality in the natural frequency of the equipment, it indicates that there may be material adhering or blocking the feed pipe, and the vibrator is activated to clean the material in the feed pipe. Furthermore, an alarm is provided. When the frequency detector detects an abnormality in the natural frequency of the equipment, the alarm is activated to prompt manual cleaning or cleaning via a dust cleaner.

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

[0029] 1. The present invention provides a dry cooling device, which is equipped with a jacketed chamber and cooling pipes. It achieves sufficient cooling of kiln slag by secondary cooling and increasing the heat exchange area. The cooling medium in the jacketed chamber is introduced into the cooling pipes, which realizes full utilization of the cooling medium and avoids problems such as high slag moisture content, difficult transportation and large water consumption.

[0030] 2. The present invention provides a dry cooling device, which sets guide vanes on the cooling pipe to push the material to move during the rotation of the cylinder, thereby improving the efficiency of cooling and the overall process.

[0031] 3. The dry cooling device provided by this utility model has a small footprint and requires little civil engineering work, and makes full use of the waste heat of slag. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a dry cooling device provided by this utility model.

[0033] Figure 2 Cross-sectional views of the outer and inner cylinders in a dry cooling device provided by this utility model.

[0034] Reference numerals in the attached drawings: 1: Outer cylinder; 2: Inner cylinder; 3: Jacketed chamber; 4: Cooling pipe; 5: Cooling medium inlet pipe; 6: Cooling medium outlet pipe; 7: Guide vane; 8: Waste heat utilization mechanism; 9: Drive mechanism; 901: Drive motor; 902: Gear; 10: Feeding mechanism; 1001: Feeding pipe; 1002: Ash remover; 1003: Feeding water cooler; 11: Screening mechanism; 1101: Screen cylinder; 1102: Gravity flap door. Detailed Implementation

[0035] The technical solution of this utility model is illustrated below. The scope of protection of this utility model includes, but is not limited to, the following embodiments.

[0036] According to an embodiment of this utility model, a dry cooling device is provided.

[0037] A dry cooling device includes an outer cylinder 1 and an inner cylinder 2. Both the outer cylinder 1 and the inner cylinder 2 are horizontally arranged cylindrical structures. One end of the inner cylinder 2 has a feed inlet communicating with its inner cavity, and the other end has a discharge outlet communicating with its inner cavity. The inner cylinder 2 is coaxially fitted inside the outer cylinder 1. A sandwich chamber 3 is formed between the outer side wall of the inner cylinder 2 and the inner side wall of the outer cylinder 1. The outer cylinder 1 is also provided with a cooling medium inlet pipe 5 and a cooling medium outlet pipe 6 communicating with the sandwich chamber 3.

[0038] A cooling pipe 4 extending axially is also provided on the inner wall of the inner cylinder 2. The medium inlet of the cooling pipe 4 is connected to the medium outlet of the interlayer chamber 3, and the medium outlet of the cooling pipe 4 is connected to the cooling medium output pipe 6.

[0039] Preferably, the cooling pipe 4 is a straight pipe on the inner wall of the inner cylinder 2 and parallel to the axial direction of the inner cylinder 2, or a spiral pipe extending circumferentially on the inner wall of the inner cylinder 2, preferably a spiral pipe extending circumferentially on the inner wall of the inner cylinder 2.

[0040] Preferably, multiple cooling pipes 4 are provided on the inner wall of the inner cylinder 2, preferably 2 to 6 pipes.

[0041] Preferably, both the cooling medium input pipe 5 and the cooling medium output pipe 6 are located on the discharge end side of the inner cylinder 2.

[0042] Preferably, a guide vane 7 protruding towards the interior of the inner cylinder 2 is fixedly or movably disposed on the cooling pipe 4. Preferably, the guide vane 7 extends along the length of the cooling pipe 4.

[0043] Preferably, the device further includes a waste heat utilization mechanism 8. The medium outlet of the cooling pipe 4 is connected to the heat source inlet of the waste heat utilization mechanism 8 via a cooling medium output pipe 6. Preferably, the waste heat utilization mechanism 8 is a waste heat boiler.

[0044] Preferably, the outer cylinder 1 and the inner cylinder 2 are inclined with the feed end higher than the discharge end. Preferably, the angle between the outer cylinder 1 and the inner cylinder 2 and the horizontal plane is 1~45°, more preferably 2~30°, and even more preferably 3~15°.

[0045] Preferably, the device further includes a drive mechanism 9. The drive mechanism 9 includes a drive motor 901 and a gear 902. The gear 902 is fixed to the outer periphery of the outer cylinder 1, and the drive motor 901 is connected to the gear 902.

[0046] Preferably, the device further includes a feeding mechanism 10. The feeding mechanism 10 includes a feeding pipe 1001, the discharge end of which is connected to the inlet of the inner cylinder 2. Preferably, the feeding mechanism 10 further includes a frequency detector and a vibrator disposed on the wall of the feeding pipe 1001, the frequency detector being connected to the vibrator. Preferably, the frequency detector is also connected to an alarm.

[0047] Preferably, the device further includes a dust remover 1002. The dust remover 1002 is disposed on the inner wall of the feed pipe 1001. Preferably, a slide rail is provided on the inner wall of the feed pipe 1001, and the dust remover 1002 is movably disposed on the inner wall of the feed pipe 1001 via the slide rail.

[0048] Preferably, the feed water cooler 1003 has a hollow structure and is provided with a medium inlet and a medium outlet. The inner cavity of the feed water cooler 1003 is arranged around the outer wall of the feed pipe 1001.

[0049] Preferably, the device further includes a screening mechanism 11. The screening mechanism 11 includes a screen cylinder 1101 and a discharger 1102. The feed inlet of the screen cylinder 1101 is connected to the discharge outlet of the inner cylinder 2, the small particle material outlet of the screen cylinder 1101 is connected to the conveyor, and the large particle material outlet of the screen cylinder 1101 is connected to the feed inlet of the converter.

[0050] Preferably, the screening mechanism 11 further includes a gravity flap gate 1102. The gravity flap gate 1102 is located at the large particle material outlet of the screen cylinder 1101.

[0051] Preferably, the screening mechanism 11 further includes a negative pressure suction port. The negative pressure suction port is located on the cylinder wall opposite the feed inlet of the screen cylinder 1101.

[0052] Example 1

[0053] A dry cooling device includes an outer cylinder 1 and an inner cylinder 2. Both the outer cylinder 1 and the inner cylinder 2 are horizontally arranged cylindrical structures. One end of the inner cylinder 2 has a feed inlet communicating with its inner cavity, and the other end has a discharge outlet communicating with its inner cavity. The inner cylinder 2 is coaxially fitted inside the outer cylinder 1. A sandwich chamber 3 is formed between the outer side wall of the inner cylinder 2 and the inner side wall of the outer cylinder 1. The outer cylinder 1 is also provided with a cooling medium inlet pipe 5 and a cooling medium outlet pipe 6 communicating with the sandwich chamber 3.

[0054] A cooling pipe 4 extending axially is also provided on the inner wall of the inner cylinder 2. The medium inlet of the cooling pipe 4 is connected to the medium outlet of the interlayer chamber 3, and the medium outlet of the cooling pipe 4 is connected to the cooling medium output pipe 6.

[0055] Example 2

[0056] Repeat Example 1, except that the cooling pipe 4 is a straight pipe on the inner wall of the inner cylinder 2 and parallel to the axial direction of the inner cylinder 2.

[0057] Example 3

[0058] The embodiment 1 is repeated, except that the cooling pipe 4 is a spiral pipe that extends circumferentially along the inner wall of the inner cylinder 2.

[0059] Example 4

[0060] Repeat Example 3, except that three cooling pipes 4 are provided on the inner wall of the inner cylinder 2.

[0061] Example 5

[0062] Example 4 is repeated, except that both the cooling medium input pipe 5 and the cooling medium output pipe 6 are located on the discharge end side of the inner cylinder 2.

[0063] Example 6

[0064] Example 5 is repeated, except that a guide vane 7 protruding towards the inside of the inner cylinder 2 is fixedly installed on the cooling pipe 4. The guide vane 7 extends along the length of the cooling pipe 4.

[0065] Example 7

[0066] The same method as Embodiment 6 is used, except that the device also includes a waste heat utilization mechanism 8. The medium outlet of the cooling pipe 4 is connected to the heat source inlet of the waste heat utilization mechanism 8 through the cooling medium output pipe 6. The waste heat utilization mechanism 8 is a waste heat boiler.

[0067] Example 8

[0068] Example 7 is repeated, except that the outer cylinder 1 and the inner cylinder 2 are inclined with the feed end higher than the discharge end. The angle between the outer cylinder 1 and the inner cylinder 2 and the horizontal plane is 10°.

[0069] Example 9

[0070] The same method is used in embodiment 8, except that the device also includes a drive mechanism 9. The drive mechanism 9 includes a drive motor 901 and a gear 902. The gear 902 is fixed to the outer periphery of the outer cylinder 1, and the drive motor 901 is connected to the gear 902.

[0071] Example 10

[0072] The same method applies to Embodiment 9, except that the device further includes a feeding mechanism 10. The feeding mechanism 10 includes a feeding pipe 1001, the outlet of which is connected to the inlet of the inner cylinder 2. The feeding mechanism 10 also includes a frequency detector and a vibrator mounted on the wall of the feeding pipe 1001, with the frequency detector connected to the vibrator. The frequency detector is also connected to an alarm.

[0073] Example 11

[0074] The same embodiment 10 is repeated, except that the device further includes a dust cleaner 1002. The dust cleaner 1002 is disposed on the inner wall of the feed pipe 1001. A slide rail is provided on the inner wall of the feed pipe 1001, and the dust cleaner 1002 is movably disposed on the inner wall of the feed pipe 1001 via the slide rail.

[0075] Example 12

[0076] The same method is used in embodiment 11, except that the device further includes a feed water cooler 1003. The feed water cooler 1003 is disposed on the inner wall of the feed pipe 1001.

[0077] Example 13

[0078] The same method as Embodiment 12 is used, except that the device also includes a screening mechanism 11. The screening mechanism 11 includes a screen cylinder 1101 and a discharger 1102. The feed inlet of the screen cylinder 1101 is connected to the discharge outlet of the inner cylinder 2, the small particle material outlet of the screen cylinder 1101 is connected to the conveyor, and the large particle material outlet of the screen cylinder 1101 is connected to the feed inlet of the converter.

[0079] Example 14

[0080] The embodiment 13 is repeated, except that the screening mechanism 11 further includes a gravity flap gate 1102. The gravity flap gate 1102 is located at the large particle material outlet of the screen cylinder 1101.

[0081] The screening mechanism 11 also includes a negative pressure air intake. The negative pressure air intake is located on the cylinder wall opposite the feed inlet of the screen cylinder 1101.

[0082] The process of treating slag using a dry cooling device as described in Example 14 is as follows:

[0083] Cooling water is introduced into the interlayered chamber formed by the outer and inner cylinders through the cooling medium inlet pipe and the medium inlet of the interlayered chamber. The cooling water flows through the interlayered chamber into the cooling pipe and finally exits from the cooling medium outlet pipe. Simultaneously, the inner and outer cylinders are driven to rotate together around their own axes by a drive motor and gears. Additionally, cooling water is introduced into the feed water cooler.

[0084] Slag is added to the feed pipe, and the vibration frequency of the feed pipe is detected by a frequency detector. If the frequency detector detects an abnormality in the natural frequency of the feed pipe, the vibrator is activated to reduce blockage. If the frequency remains abnormal, an alarm is activated to prompt manual unblocking, and if necessary, the ash remover is activated to clean the inner wall of the feed pipe. After the material enters the inner cavity of the inner cylinder along the feed pipe, it moves forward under the rotation of the inner cylinder and enters the screening mechanism, where it is screened to obtain large and small particles, thus completing the processing of the slag.

Claims

1. A dry cooling device, characterized in that: The device includes an outer cylinder (1) and an inner cylinder (2); both the outer cylinder (1) and the inner cylinder (2) are horizontally arranged cylindrical structures. One end of the inner cylinder (2) is provided with a feed port that communicates with the inner cavity of the inner cylinder (2), and the other end of the inner cylinder (2) is provided with a discharge port that communicates with the inner cavity of the inner cylinder (2). The inner cylinder (2) is coaxially fitted inside the outer cylinder (1). A sandwich chamber (3) is formed between the outer side wall of the inner cylinder (2) and the inner side wall of the outer cylinder (1). A cooling medium input pipe (5) and a cooling medium output pipe (6) that communicate with the sandwich chamber (3) are also provided on the outer cylinder (1). A cooling pipe (4) extending along its axial direction is also provided on the inner wall of the inner cylinder (2); the medium inlet of the cooling pipe (4) is connected to the medium outlet of the interlayer chamber (3), and the medium outlet of the cooling pipe (4) is connected to the cooling medium output pipe (6).

2. The apparatus according to claim 1, characterized in that: The cooling pipe (4) is a straight pipe on the inner wall of the inner cylinder (2) and parallel to the axial direction of the inner cylinder (2) or a spiral pipe extending circumferentially on the inner wall of the inner cylinder (2), preferably a spiral pipe extending circumferentially on the inner wall of the inner cylinder (2). Preferably, multiple cooling pipes (4) are provided on the inner side wall of the inner cylinder (2), preferably 2 to 6 pipes; Preferably, the cooling medium input pipe (5) and the cooling medium output pipe (6) are both located on the discharge end side of the inner cylinder (2).

3. The apparatus according to claim 1 or 2, characterized in that: A guide vane (7) protruding towards the interior of the inner cylinder (2) is fixedly or movably installed on the cooling pipe (4); preferably, the guide vane (7) extends along the length of the cooling pipe (4).

4. The apparatus according to any one of claims 1-3, characterized in that: The device also includes a waste heat utilization mechanism (8); the medium outlet of the cooling pipe (4) is connected to the heat source inlet of the waste heat utilization mechanism (8) through the cooling medium output pipe (6); preferably, the waste heat utilization mechanism (8) is a waste heat boiler.

5. The apparatus according to any one of claims 1-4, characterized in that: The outer cylinder (1) and the inner cylinder (2) are inclined with the feed end higher than the discharge end; preferably, the angle between the outer cylinder (1) and the inner cylinder (2) and the horizontal plane is 1~45°, more preferably 2~30°, and more preferably 3~15°.

6. The apparatus according to any one of claims 1-5, characterized in that: The device also includes a drive mechanism (9); the drive mechanism (9) includes a drive motor (901) and a gear (902); the gear (902) is fixed on the outer periphery of the outer cylinder (1), and the drive motor (901) is connected to the gear (902).

7. The apparatus according to any one of claims 1-6, characterized in that: The device also includes a feeding mechanism (10); the feeding mechanism (10) includes a feeding pipe (1001), the discharge end of the feeding pipe (1001) is connected to the inlet of the inner cylinder (2); preferably, the feeding mechanism (10) also includes a frequency detector and a vibrator disposed on the wall of the feeding pipe (1001), the frequency detector being connected to the vibrator; preferably, the frequency detector is also connected to an alarm.

8. The apparatus according to claim 7, characterized in that: The device also includes a dust cleaner (1002); the dust cleaner (1002) is disposed on the inner wall of the feed pipe (1001); preferably, a slide rail is provided on the inner wall of the feed pipe (1001), and the dust cleaner (1002) is movably disposed on the inner wall of the feed pipe (1001) via the slide rail. Preferably, the device further includes a feed water cooler (1003); the feed water cooler (1003) has a hollow structure and is provided with a medium inlet and a medium outlet, and the inner cavity of the feed water cooler (1003) is arranged around the outer wall of the feed pipe (1001).

9. The apparatus according to any one of claims 1-8, characterized in that: The device also includes a screening mechanism (11); the screening mechanism (11) includes a screen cylinder (1101); the inlet of the screen cylinder (1101) is connected to the outlet of the inner cylinder (2), the small particle material outlet of the screen cylinder (1101) is connected to the conveyor, and the large particle material outlet of the screen cylinder (1101) is connected to the inlet of the converter. Preferably, the screening mechanism (11) further includes a gravity flap gate (1102); the gravity flap gate (1102) is located at the large particle material outlet of the screen cylinder (1101).

10. The apparatus according to claim 8 or 9, characterized in that: The screening mechanism (11) also includes a negative pressure air intake port; the negative pressure air intake port is located on the cylinder wall opposite the feed inlet of the screen cylinder (1101).

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