CN115491781A - Gas radial blowing and uniformly heated fiber heat treatment device and method - Google Patents

Abstract

The invention belongs to the technical field of fiber heat treatment, and particularly relates to a fiber heat treatment device and a fiber heat treatment method with radial gas purging and uniform heating, wherein the fiber heat treatment device comprises a top cover heat transfer device, a circumferential heat transfer device, a bottom cover heat transfer device, an axis heat transfer and gas supply device and a gas return device which are coaxially arranged; the top cover heat transfer device is connected with the top of the circumferential heat transfer device through a flange; the bottom cover heat transfer device is connected with the bottom of the circumferential heat transfer device; the gas return air device is arranged in the inner cavity of the circumferential heat transfer device; the axis heat transfer and air supply device penetrates through the center of the bottom cover heat transfer device and extends into the inner cavity of the air return device. The invention can realize the uniform heating of the fiber spinning cake, can also realize the blowing of gas to the spinning cake and the uniform flow of the gas along the diameter direction of the spinning cake, and the flow direction can be from inside to outside or from outside to inside, and the gas is blown according to the requirement to take away low molecular substances volatilized from the fiber, thereby reducing the adverse factors influencing the performance of the fiber.

Description

Gas radial blowing and uniformly heated fiber heat treatment device and method

Technical Field

The invention belongs to the technical field of fiber heat treatment, and particularly relates to a fiber heat treatment device and method with gas radial blowing and uniform heating.

Background

Synthetic fibers are made from synthetic small molecule polymers. The compounds used to make these fibers come from raw materials such as petroleum based chemicals or petrochemicals. These materials polymerize into chemical species that bind two adjacent carbon atoms. Different chemical compounds are used to produce different types of synthetic fibers. Synthetic fibers account for approximately half of all fibers used and are used in every area of fiber and textile technology. The high-performance fiber is a new generation of synthetic fiber with high strength, high modulus and high temperature resistance developed by the fiber science and engineering industries. The composite material formed by taking high-performance fiber as a reinforcing matrix and using thermoplastic resin, thermosetting resin and various types of braided fabrics has been gradually expanded to be applied to the aspects of aviation, aerospace, transportation, industrial production, agriculture and forestry, marine aquatic products, energy sources, environmental protection, communication, medical treatment and health, sports equipment and the like, and provides material conditions for human beings.

Most high-performance specialty fibers are made by wet spinning. In wet-formed fibrous structures, there are sometimes numerous voids of varying sizes that are typically partially or totally eliminated by virtue of subsequent heat treatment. In the cooling, solidifying and stretching processes of the high-performance fiber, under the action of external force, the acting force mutually applied to molecular chains is unbalanced. The existence of internal stress and crystallization defects in the fiber enables the structure of the fiber to be in an unstable state, easy to deform and unstable in performance. Therefore, after the fiber filament is prepared by stretching, the fiber which is shaped by stretching is treated in a high-temperature atmosphere or a heat medium such as an aqueous solution for a period of time to eliminate the internal stress, thereby being beneficial to the fiber structure to reach a stable state, having stable performance and being not easy to deform.

Chinese patent CN202265597U discloses a single-tube gas-shielded fiber heat treatment device, which comprises a heating tube made of high-temperature alloy with openings at two ends, end sockets are fixed at the openings at two ends of the heating tube, corresponding feed inlets and discharge outlets are respectively arranged on the two end sockets, a left electrode clamping end and a right electrode clamping end are respectively fixed on the outer wall of the heating tube, and a shielding gas inlet is arranged on the tube wall of the heating tube. The heating pipe made of high-temperature alloy is adopted, the space in the pipe is small, the temperature is uniform and controllable, the heat treatment performance is ensured, and the energy can be saved. However, the heating mode of the patent is single, and the uniform heating of the fiber cannot be effectively ensured; and at high temperatures, some high performance fibers may also precipitate low molecular weight species that may adversely affect the performance of the fiber and need to be removed as much as possible.

According to the market demand, a fiber heat treatment device is needed urgently. The device can guarantee that the fiber is heated evenly, can effectively get rid of the low molecular weight thing that the fiber volatilizees again, guarantees the stability of fiber performance.

Disclosure of Invention

In view of the above disadvantages, the present invention provides a device and a method for heat treatment of fibers by radial gas purging with uniform heating. The invention can realize that the fiber spinning cake is uniformly heated, is suitable for various process requirements, realizes that the fiber spinning cake is in a uniform temperature environment at high temperature, and ensures that the structural performance of the fiber is more stable; meanwhile, the gas can be blown to the spinning cake and can uniformly flow along the diameter direction of the spinning cake, the flow direction can be from inside to outside or from outside to inside, and gas blowing is carried out according to the requirement to take away low molecular substances volatilized from the fibers, so that adverse factors influencing the performance of the fibers are reduced.

In order to achieve the purpose, the invention adopts the following technical scheme:

a fiber heat treatment device with radial gas purging and uniform heating comprises a top cover heat transfer device, a circumferential heat transfer device, a bottom cover heat transfer device, an axis heat transfer and gas supply device and a gas return device which are coaxially arranged; the top cover heat transfer device is connected with the top of the circumferential heat transfer device through a flange; the bottom cover heat transfer device is connected with the bottom of the circumferential heat transfer device; the gas return air device is arranged in the inner cavity of the circumferential heat transfer device; the axis heat transfer and air supply device penetrates through the center of the bottom cover heat transfer device and extends into the inner cavity of the air return device.

Preferably, the top cover heat transfer device comprises a flange top cover, and the top of the flange top cover is symmetrically provided with 2 lifting lugs; a first heat transfer medium flow channel of a spiral plate type structure is coaxially arranged at the bottom of the top cover heat transfer device, and the first heat transfer medium flow channel is communicated with a first heat transfer medium inlet connecting pipe and a first heat transfer medium outlet connecting pipe at the top of the top cover heat transfer device; an upper temperature measuring accessory is arranged at the top of the flange top cover in a penetrating mode.

Preferably, the circumferential heat transfer device comprises a shell, a heat transfer medium coil pipe with a spiral structure is coaxially arranged in an inner cavity between the shell and the gas return air device, and an inlet and outlet connecting pipe of the heat transfer medium coil pipe penetrates through the shell of the circumferential heat transfer device.

Preferably, the top of the bottom cover heat transfer device is coaxially provided with a second heat transfer medium flow channel of a spiral plate structure, the second heat transfer medium flow channel is communicated with a second heat transfer medium inlet connecting pipe and a second heat transfer medium outlet connecting pipe at the bottom of the bottom cover heat transfer device, and the bottom of the bottom cover heat transfer device is provided with a lower temperature measurement accessory in a penetrating manner.

Preferably, the axis heat transfer and air supply device comprises an axis heat transfer medium circulation pipeline which is sealed up and down, an air supply sleeve is coaxially sleeved on the outer side wall of the axis heat transfer medium circulation pipeline, a first annular blocking plate is arranged at the top end of the air supply sleeve, and a second annular blocking plate is arranged at the bottom end of the air supply sleeve.

More preferably, a central partition plate is vertically arranged in an inner cavity of the axis heat transfer medium circulation pipeline, and the bottom of the central partition plate is connected with the bottom of the axis heat transfer medium circulation pipeline; and the lower side wall of the axis heat transfer medium circulation pipeline is communicated with a third heat transfer medium inlet connecting pipe and a third heat transfer medium outlet connecting pipe which are symmetrically arranged relative to the central partition plate.

More preferably, a first annular partition plate parallel to the first annular blocking plate is arranged at the lower part of an inner cavity between the air supply sleeve and the axis heat transfer medium circulation pipeline, and small holes are uniformly formed in the first annular partition plate; small holes are uniformly formed in the side wall of the air supply sleeve above the first annular partition plate; and a gas inlet connecting pipe is communicated with the side wall of the gas supply sleeve below the first annular partition plate.

Preferably, the gas return device comprises an inner pipe which is closed up and down, and an outer pipe is coaxially sleeved on the outer side wall of the inner pipe; the top of the outer pipe is provided with a third annular blocking plate, and the bottom of the outer pipe is provided with a fourth annular blocking plate; a second annular partition plate parallel to the third annular blocking plate is arranged at the upper part of the inner cavity between the outer pipe and the inner pipe, and small holes are uniformly formed in the second annular partition plate; small holes are uniformly formed in the side wall of the inner pipe below the second annular partition plate; and the side wall of the outer pipe above the second annular partition plate is communicated with a gas outlet connecting pipe, and the gas outlet connecting pipe penetrates through the shell of the circumferential heat transfer device.

The invention also claims a method for carrying out fiber heat treatment by using the device, which comprises the following steps:

s1: sleeving the fiber cake outside the pipe wall of the air supply sleeve to ensure that the fiber cake and the shaft center transfer heat and the air supply device are coaxial;

s2: respectively introducing heat transfer media into a first heat transfer medium inlet connecting pipe at the top of the top cover heat transfer device, an inlet connecting pipe of the circumferential heat transfer device, a second heat transfer medium inlet connecting pipe at the bottom of the bottom cover heat transfer device and a third heat transfer medium inlet connecting pipe of the axis heat transfer and gas supply device, transferring heat to the axis and introducing inert gas into a gas inlet connecting pipe in the gas supply device, so that the inert gas sweeps the fiber cake from inside to outside along the radial direction;

s3: and stopping introducing the heat transfer medium and the inert gas after the purging is finished, then taking out the fiber cake, and finishing the treatment.

More preferably, the heat transfer medium is one or more selected from water, heat transfer oil, biphenyl and water vapor; the temperature of the heat transfer medium is controlled to be 100-400 ℃, and the purging time is controlled to be 5-20h.

Compared with the prior art, the invention has the following beneficial effects:

(1) The invention not only can easily realize the subarea conduction of heat through 4 sets of heat transfer devices, but also can ensure that the temperature of each part in the atmosphere of the product is uniform, is convenient for real-time detection and regulation of the temperature, ensures that the structural performance of the fiber is more stable, and meets the process requirements of different types of fibers.

(2) The invention can realize that the gas uniformly and regularly flows and can sweep the fiber spinning cake along the radial direction, thereby not only solving the problem that the disordered sweeping of the gas is difficult to control, but also solving the problem that the low molecular substances separated from the fibers in the spinning cake by surface blowing are difficult to treat, and improving the heat treatment effect.

Drawings

FIG. 1 is a schematic view of the entire apparatus for heat-treating fibers according to the present invention;

FIG. 2 is a schematic view of a header heat transfer unit according to the present invention;

FIG. 3 is a schematic view of a circumferential heat transfer device of the present invention;

FIG. 4 is a schematic view of a bottom cover heat transfer device of the present invention;

FIG. 5 is a schematic view of an axial heat transfer and gas supply apparatus according to the present invention;

fig. 6 is a schematic view of the air return apparatus of the present invention.

The reference numbers are as follows: 1. a header heat transfer unit; 2. a circumferential heat transfer device; 3. a bottom cover heat transfer device; 4. the axis conducts heat and supplies the gas device; 5. a gas return device; 11. a flange top cover; 12. lifting lugs; 13. an upper temperature measurement accessory; 14. a first heat transfer medium inlet connection pipe; 15. a first heat transfer medium flow passage; 16. a first heat transfer medium outlet connection pipe; 21. a housing; 22. a heat transfer medium coil; 31. a bottom cover; 32. a lower temperature measuring accessory; 33. a second heat transfer medium flow passage; 34. a second heat transfer medium inlet connection pipe; 35. a second heat transfer medium outlet connection pipe; 41. an axial heat transfer medium circulation line; 42. a third heat transfer medium inlet connection pipe; 43. a central partition; 44. a gas supply sleeve; 45. a first annular closure plate; 46. a gas inlet adapter; 47. a first annular partition; 48. a third heat transfer medium outlet connection pipe; 49. a second annular closure plate; 51. an inner tube; 52. an outer tube; 53. a third annular closure plate; 54. a second annular partition plate; 55. a gas outlet connection pipe; 56. a fourth annular closure plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

as shown in fig. 1-6, a fiber heat treatment device with radial gas purging and uniform heating comprises a top cover heat transfer device 1, a circumferential heat transfer device 2, a bottom cover heat transfer device 3, an axis heat transfer and gas supply device 4 and a gas return device 5 which are coaxially arranged; the top cover heat transfer device 1 is connected with the top of the circumferential heat transfer device 2 through a flange; the bottom cover heat transfer device 3 is connected with the bottom of the circumferential heat transfer device 2; the gas return device 5 is arranged in the inner cavity of the circumferential heat transfer device 2; the shaft center heat transfer and air supply device 4 penetrates through the center of the bottom cover heat transfer device 3 and extends into the inner cavity of the air return device 5.

In the embodiment, the top cover heat transfer device 1 comprises a flange top cover 11, and 2 lifting lugs 12 are symmetrically arranged on the top of the flange top cover 11; a first heat transfer medium flow passage 15 with a spiral plate structure is coaxially arranged at the bottom of the top cover heat transfer device 1, and the first heat transfer medium flow passage 15 is communicated with a first heat transfer medium inlet connecting pipe 14 and a first heat transfer medium outlet connecting pipe 16 at the top of the top cover heat transfer device 1; an upper temperature measuring accessory 13 penetrates through the top of the flange top cover 11.

In this embodiment, the circumferential heat transfer device 2 includes a casing 21, a heat transfer medium coil 22 having a spiral structure is coaxially disposed in an inner cavity between the casing 21 and the air return device 5, and an inlet/outlet connection pipe of the heat transfer medium coil 22 is disposed through the outside of the casing 21 of the circumferential heat transfer device 2.

In this embodiment, a second heat transfer medium flow channel 33 with a spiral plate structure is coaxially disposed at the top of the bottom cover heat transfer device 3, the second heat transfer medium flow channel 33 is communicated with a second heat transfer medium inlet connection pipe 34 and a second heat transfer medium outlet connection pipe 35 at the bottom of the bottom cover heat transfer device 3, and a lower temperature measurement accessory 32 is disposed at the bottom of the bottom cover heat transfer device 3 in a penetrating manner.

In this embodiment, the axis heat transfer and air supply device 4 includes an axis heat transfer medium circulation pipeline 41 which is closed up and down, an air supply sleeve 44 is coaxially sleeved on the outer side wall of the axis heat transfer medium circulation pipeline 41, a first annular blocking plate 45 is arranged at the top end of the air supply sleeve 44, a second annular blocking plate 49 is arranged at the bottom end of the air supply sleeve 44, and an annular space is formed among the air supply sleeve 44, the axis heat transfer medium circulation pipeline 41, the first annular blocking plate 45 and the second annular blocking plate 49.

In this embodiment, a central partition plate 43 is vertically disposed in the inner cavity of the axis heat transfer medium circulation pipeline 41, and the bottom of the central partition plate 43 is connected to the bottom of the axis heat transfer medium circulation pipeline 41; the lower side wall of the axial heat transfer medium circulation pipeline 41 is communicated with a third heat transfer medium inlet connecting pipe 42 and a third heat transfer medium inlet connecting pipe 48 which are symmetrically arranged relative to the central partition plate 43.

In this embodiment, a first annular partition plate 47 parallel to the first annular blocking plate 45 is disposed at the lower part of the inner cavity between the air supply sleeve 44 and the axial heat transfer medium circulation pipeline 41, so as to divide the annular space into 2 spaces with different sizes; the first annular partition plate 47 is uniformly provided with small holes; small holes are uniformly formed in the side wall of the gas supply sleeve 44 above the first annular partition plate 47; a gas inlet connecting pipe 46 is communicated with the side wall of the gas supply sleeve 44 below the first annular partition plate 47.

In this embodiment, the gas return air device 5 includes an inner tube 51 closed up and down, and an outer tube 52 coaxially sleeved on an outer side wall of the inner tube 51; a third annular blocking plate 53 is arranged at the top of the outer pipe 52, a fourth annular blocking plate 56 is arranged at the bottom of the outer pipe 52, and an annular space is formed among the inner pipe 51, the outer pipe 52, the third annular blocking plate 53 and the fourth annular blocking plate 56; a second annular partition plate 54 parallel to a third annular blocking plate (53) is arranged at the upper part of the inner cavity between the outer pipe 52 and the inner pipe 51, and divides the annular space into 2 spaces with different sizes; small holes are uniformly formed in the second annular partition plate 54; small holes are uniformly formed in the side wall of the inner pipe 51 below the second annular partition plate; a gas outlet connecting pipe 55 is communicated with the side wall of the outer pipe 52 above the second annular partition plate, and the gas outlet connecting pipe 55 is arranged outside the shell 21 of the circumferential heat transfer device 2 in a penetrating way.

In the embodiment, the method for the fiber heat treatment device which is radially blown according to the gas and uniformly heated comprises the following steps:

s1: sleeving the fiber cake outside the pipe wall of the gas supply sleeve 44, so that the fiber cake and the shaft center transfer heat and are coaxial with the gas supply device 4;

s2: respectively introducing heat conduction oil of 300 ℃ into a first heat transfer medium inlet connecting pipe 14 at the top of the top cover heat transfer device 1, an inlet connecting pipe of the circumferential heat transfer device 2, a second heat transfer medium inlet connecting pipe 34 at the bottom of the bottom cover heat transfer device 3 and a third heat transfer medium inlet connecting pipe 42 of the axis heat transfer and gas supply device 4, and introducing nitrogen into a gas inlet connecting pipe 46 in the axis heat transfer and gas supply device 4, so that the nitrogen sweeps the fiber spinning cake from inside to outside along the radial direction for 10 hours;

s3: and stopping introducing the heat conduction oil and the nitrogen after the purging is finished, taking out the fiber cake, and finishing the treatment.

In this embodiment, the top cover heat transfer device 1, the circumferential heat transfer device 2, the bottom cover heat transfer device 3, and the axis heat transfer and gas supply device 4 may form independent flow channels respectively, and heat transfer oil circulates respectively, so that an effect of uniform temperature in the cavity may be achieved. The axis heat transfer and gas supply device 4 and the gas return device 5 form a unique gas circulation path, nitrogen enters a small annular space of the gas supply sleeve 44 from the gas inlet connecting pipe 46, the nitrogen continues to enter a large annular space through uniformly distributed small holes of the annular partition plate 47, and after the large annular space is filled with the nitrogen, fiber cakes are swept from inside to outside along the radial direction through the small holes uniformly distributed on the pipe wall of the gas supply sleeve 44; after the nitrogen gas flows out of the fiber cake with the small molecular polymer precipitated from the fibers, the nitrogen gas continuously flows outwards along the radial direction, enters a larger annular space formed between the inner pipe 51 and the outer pipe 52 through small holes on the inner pipe 51 of the gas return air device 5 and is filled with the small molecular polymer, then flows into the smaller annular space through small holes of the annular partition plate 53, and then flows out of the heat treatment device through the gas outlet connecting pipe 55.

The above description is provided for the purpose of describing the present invention in more detail, and it should not be construed that the present invention is limited to the description, and it should be understood that the present invention is not limited to the embodiment described above, and that the present invention is capable of being implemented by those skilled in the art.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A fiber heat treatment device with radial gas purging and uniform heating is characterized by comprising a top cover heat transfer device (1), a circumferential heat transfer device (2), a bottom cover heat transfer device (3), an axis heat transfer and gas supply device (4) and a gas return device (5) which are coaxially arranged; the top cover heat transfer device (1) is connected with the top of the circumferential heat transfer device (2) through a flange; the bottom cover heat transfer device (3) is connected with the bottom of the circumferential heat transfer device (2); the gas return device (5) is arranged in the inner cavity of the circumferential heat transfer device (2); the axis heat transfer and air supply device (4) penetrates through the center of the bottom cover heat transfer device (3) and extends into the inner cavity of the air return device (5).

2. The fiber heat treatment device with the radial gas purging and the uniform heating function as claimed in claim 1, wherein the top cover heat transfer device (1) comprises a flange top cover (11), and 2 lifting lugs (12) are symmetrically arranged at the top of the flange top cover (11); a first heat transfer medium flow channel (15) with a spiral plate structure is coaxially arranged at the bottom of the top cover heat transfer device (1), and the first heat transfer medium flow channel (15) is communicated with a first heat transfer medium inlet connecting pipe (14) and a first heat transfer medium outlet connecting pipe (16) at the top of the top cover heat transfer device (1); an upper temperature measuring accessory (13) penetrates through the top of the flange top cover (11).

3. The fiber heat treatment device with radial gas purging and uniform heating according to claim 1, characterized in that the circumferential heat transfer device (2) comprises a shell (21), a heat transfer medium coil (22) with a spiral structure is coaxially arranged in an inner cavity between the shell (21) and the gas return air device (5), and inlet and outlet connecting pipes of the heat transfer medium coil (22) penetrate through the shell (21) of the circumferential heat transfer device (2).

4. The fiber heat treatment device with radial gas purging and uniform heating as claimed in claim 1, wherein a second heat transfer medium flow passage (33) with a spiral plate structure is coaxially arranged at the top of the bottom cover heat transfer device (3), the second heat transfer medium flow passage (33) is communicated with a second heat transfer medium inlet connecting pipe (34) and a second heat transfer medium outlet connecting pipe (35) at the bottom of the bottom cover heat transfer device (3), and a lower temperature measuring accessory (32) penetrates through the bottom of the bottom cover heat transfer device (3).

5. The fiber heat treatment device with the radial gas purging and the uniform heating function as claimed in claim 1, wherein the axial heat transfer and gas supply device (4) comprises an axial heat transfer medium circulation pipeline (41) which is closed up and down, a gas supply sleeve (44) is coaxially sleeved on the outer side wall of the axial heat transfer medium circulation pipeline (41), a first annular blocking plate (45) is arranged at the top end of the gas supply sleeve (44), and a second annular blocking plate (49) is arranged at the bottom end of the gas supply sleeve (44).

6. The fiber heat treatment device with radial gas purging and uniform heating according to claim 5, characterized in that a central partition plate (43) is vertically arranged in the inner cavity of the axial heat transfer medium circulation pipeline (41), and the bottom of the central partition plate (43) is connected with the bottom of the axial heat transfer medium circulation pipeline (41); and the lower side wall of the axis heat transfer medium circulation pipeline (41) is communicated with a third heat transfer medium inlet connecting pipe (42) and a third heat transfer medium outlet connecting pipe (48) which are symmetrically arranged relative to the central partition plate (43).

7. The fiber heat treatment device with radial gas purging and uniform heating according to claim 5, characterized in that a first annular partition plate (47) parallel to the first annular blocking plate (45) is arranged at the lower part of the inner cavity between the gas supply sleeve (44) and the axial heat transfer medium circulation pipeline (41), and small holes are uniformly formed in the first annular partition plate (47); small holes are uniformly formed in the side wall of the gas supply sleeve (44) above the first annular partition plate (47); and a gas inlet connecting pipe (46) is communicated with the side wall of the gas supply sleeve (44) below the first annular partition plate (47).

8. The heat treatment device for the fibers with the radial gas purging and the uniform heating as claimed in claim 1, wherein the gas return device (5) comprises an inner pipe (51) which is closed up and down, and an outer pipe (52) is coaxially sleeved on the outer side wall of the inner pipe (51); a third annular blocking plate (53) is arranged at the top of the outer pipe (52), and a fourth annular blocking plate (56) is arranged at the bottom of the outer pipe (52); a second annular partition plate (54) parallel to the third annular blocking plate (53) is arranged at the upper part of the inner cavity between the outer pipe (52) and the inner pipe (51), and small holes are uniformly formed in the second annular partition plate (54); small holes are uniformly formed in the side wall of the inner pipe (51) below the second annular partition plate (54); and a gas outlet connecting pipe (55) is communicated with the side wall of the outer pipe (52) above the second annular partition plate (54), and the gas outlet connecting pipe (55) penetrates through the outside of the shell (21) of the circumferential heat transfer device (2).

9. A method for heat treatment of fibres using the apparatus according to any of claims 1 to 8, characterised in that the method comprises the steps of:

s1: sleeving the fiber cake outside the pipe wall of the air supply sleeve (44) to ensure that the fiber cake and the shaft center transfer heat and the air supply device (4) are coaxial;

s2: respectively introducing heat transfer media into a first heat transfer medium inlet connecting pipe (14) at the top of the top cover heat transfer device (1), an inlet connecting pipe of the circumferential heat transfer device (2), a second heat transfer medium inlet connecting pipe (34) at the bottom of the bottom cover heat transfer device (3) and a third heat transfer medium inlet connecting pipe (42) of the axis heat transfer and gas supply device (4), transferring heat to the axis and introducing inert gas into a gas inlet connecting pipe (46) in the gas supply device (4), so that the inert gas sweeps the fiber cake from inside to outside along the radial direction;

s3: and stopping introducing the heat transfer medium and the inert gas after the purging is finished, then taking out the fiber cake, and finishing the treatment.

10. The method according to claim 9, wherein the heat transfer medium is one or more selected from water, thermal oil, biphenyl, and water vapor.

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