Carbon fiber production space air purification system

Abstract

The application provides a carbon fiber production space air purification system, and belongs to the technical field of carbon fiber production equipment, which comprises a space body, a fresh air driving device and a fresh air channel, the air inlet of the fresh air channel is communicated with the external environment, the air outlet of the fresh air channel is communicated with the fresh air inlet, the fresh air outlet is communicated with the internal space of the space body, the fresh air channel further has an air guide return air inlet communicated with the lower region of the internal space, and the air guide return air inlet is provided with a first filter element. On one hand, the first filter element can be used to efficiently adsorb the large-diameter or heavy hair generated in the internal space to the first filter element, so that the large-diameter or heavy hair can be efficiently cleaned, and the purification effect of the air in the internal space is ensured; on the other hand, the fresh air flow in the application forms an injection effect on the air in the internal space, and the preheating of the fresh air introduced into the internal space can be realized by air mixing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of carbon fiber production equipment, and particularly relates to a carbon fiber production space air purification system. BACKGROUND

[0002] Polyacrylonitrile-based carbon fiber is a kind of filamentous carbon material, which has high specific strength, high specific modulus, high temperature resistance, corrosion resistance, heat transfer and small thermal expansion coefficient, and is widely used in the fields of aerospace, rail transportation, building, energy and sports equipment. With the expansion of the production space, higher requirements are put forward for the production environment of the workshop. Scientific research has proved that the production environment of polyacrylonitrile-based precursor and carbon fiber should be clean, and the spinning workshop should reach the level of thousands of purification to prevent dust in the air from polluting the surface of the nascent fiber. In the ordinary workshop without purification, it is impossible to obtain high-quality precursor. The micron filter should be used in the pre-oxidation workshop to prevent dust in the air from polluting the surface of the pre-oxidized fiber, because in the pre-oxidation environment of 200-300 DEG C, the fiber is in a hot state, and dust is easy to adhere to the surface and cause pollution.

[0003] In the carbon fiber production process, the fiber will be hairy, and a lot of small carbonized fiber scraps will be generated. If the carbonized fiber scraps adhere to the skin, irritation and itching will occur. If the carbonized fiber scraps are inhaled into the throat or lungs, damage will be caused. The carbonized fiber scraps have conductivity, and if they come into contact with the power supply, they may be electrocuted. If the carbonized fiber scraps floating in the air adhere to the plug or socket, a short circuit will occur, causing damage to the electrical appliances. The amount of hair in a kiloton workshop is larger, the possibility of production accidents is greater, and the adverse effects are more serious.

[0004] In order to solve the above technical problems, the carbon fiber production space in the prior art discharges the exhaust gas mixed with part of the hair, dust and the like in the production space by means of the exhaust device. Some technical solutions increase a corresponding fresh air module to be able to deliver the external fresh air into the carbon fiber production space after necessary temperature and humidity adjustment. However, the fan power required for discharging the air in the production space by the exhaust device is large, and the hair (including precursor, pre-oxidized fiber and carbonized fiber) with large amount of fiber bundle and large length (large weight) cannot be effectively discharged, so that the content of the hair in the production space is still high, and the above-mentioned various adverse problems are still prominent. SUMMARY

[0005] Therefore, the present application provides a carbon fiber production space air purification system, which can solve the technical problem that the air purification system of the carbon fiber production space in the prior art cannot effectively discharge and purify the hair with large amount of fiber bundle and large length.

[0006] In order to solve the above problems, the present application provides a carbon fiber production space air purification system, comprising a space body, a fresh air driving device and a fresh air channel, the fresh air driving device comprising a fresh air fan, a fresh air inlet and a fresh air outlet, the fresh air channel having an air inlet communicating with the external environment, the fresh air channel having an air outlet communicating with the fresh air inlet, the fresh air outlet communicating with the internal space of the space body, the fresh air channel further having an air return port communicating with the lower region of the internal space, the air return port being provided with a first filter.

[0007] In some embodiments, the space body has a bottom wall, the bottom wall being provided with a floor, the lower region of the floor being configured with a settling chamber, the floor having a through air hole extending therethrough, under the action of fresh air flowing in the fresh air channel, the air in the internal space at least partially enters the settling chamber through the through air hole and enters the fresh air channel through the first filter; and / or, the fresh air outlet is configured on the top wall of the space body.

[0008] In some embodiments, the through flow area of the through air hole is Sa, 2cm 2 ≤Sa≤3cm 2 , the thickness of the floor is h, 5cm≤h≤10cm; and / or, the outer surface of the floor has a corrosion-resistant and oil-resistant layer.

[0009] In some embodiments, the through air hole is a regular hexagon; and / or, the bottom wall is provided with a mounting base, the bottom of the mounting base being provided with a carbon fiber production equipment, the mounting base and the first side wall of the space body forming the settling chamber, one side of the floor being supported on the mounting base.

[0010] In some embodiments, the fresh air channel is arranged outside the first side wall and shares the first side wall with the space body, and the air return port is configured on the first side wall.

[0011] In some embodiments, the side of the mounting base opposite to the settling chamber is a slope, the height of the slope gradually decreasing from the side of the carbon fiber production equipment to the side of the first filter; and / or, the side surface of the slope facing the settling chamber has a self-cleaning coating.

[0012] In some embodiments, the bottom wall of the fresh air channel is provided with a drain trap.

[0013] In some embodiments, the carbon fiber production space air purification system further comprises an exhaust device, the exhaust device comprising an air suction hood, an exhaust fan, and a burning device, the air suction hood being arranged above the carbon fiber production equipment, the air suction hood being in communication with the air suction port of the exhaust fan, and the exhaust port of the exhaust fan being in communication with the burning device.

[0014] In some embodiments, the first filter has a portion higher than the floor, and the first filter is inserted into the air intake and return port.

[0015] In some embodiments, the fresh air driving device further comprises a second filter and a third filter, the second filter and the third filter being arranged in front of and behind each other in the fresh air flow path; and / or, the fresh air driving device further comprises at least one of a cooling coil, a reheating coil, and a humidifying component.

[0016] The carbon fiber production space air purification system provided by the present application is characterized in that, by the operation of the fresh air fan in the fresh air driving device, external fresh air enters the fresh air driving device through the fresh air channel and is finally introduced into the internal space through the fresh air outlet. The fresh air flows rapidly in the fresh air channel at a certain flow rate, thereby forming a vacuum at the first filter, i.e., forming an air intake at the air intake and return port of the internal space, and the air in the internal space is introduced into the fresh air channel, and after mixing with the fresh air, the air is again introduced into the internal space. In the process of air flow, on the one hand, since the air intake and return port is located in the lower region of the internal space, the first filter can be used to efficiently adsorb the large-sized or heavy lint generated in the internal space to the first filter, thereby effectively ensuring that the large-sized or heavy lint can be efficiently cleaned and ensuring the purification effect of the air in the internal space. On the other hand, since the fresh air flow in the present application forms an air intake effect on the air in the internal space, the structure design of the air purification system is simplified, and the preheating of the fresh air introduced into the internal space can be realized by mixing part of the return air with the fresh air. In particular, in the case of low temperature such as winter, the preheated fresh air can prevent the freezing of the pipeline in the fresh air driving device and the adverse fluctuation of the temperature in the internal space without the need to set a preheating component in the fresh air driving device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a front view of the internal structure of the carbon fiber production space air purification system of the present application, in which the arrows show the direction of air flow;

[0018] Figure 2 FIG. 2 is a left view of the carbon fiber production space air purification system of the present application (only showing the structure of the first filter and the space body, etc.); Figure 1

[0019] Figure 3 FIG. 3 is a front view of the fresh air driving device of the carbon fiber production space air purification system of the present application; Figure 1 ​a perspective view of the floor structure in the room;

[0020] Figure 4 for Figure 1 a plan view of the floor area in the room.

[0021] Reference signs are indicated as:

[0022] 1, space body; 11, internal space; 12, floor; 121, air passage; 122, floor support; 13, settling chamber; 14, mounting base; 2, fresh air driving device; 21, fresh air fan; 22, fresh air inlet; 23, fresh air outlet; 241, second filter; 242, third filter; 25, cooling coil; 26, reheating coil; 27, humidifying component; 3, fresh air channel; 31, drain floor drain; 4, first filter; 51, suction hood; 52, exhaust fan; 53, incineration device; 100, carbon fiber production equipment. DETAILED DESCRIPTION

[0023] For reference Figures 1 to 4 As shown in the drawings, according to an embodiment of the present application, a carbon fiber production space air purification system is provided, the aforementioned carbon fiber being, for example, polyacrylonitrile-based carbon fiber, comprising a space body 1, a fresh air driving device 2 and a fresh air channel 3, the fresh air driving device 2 comprising a fresh air fan 21, a fresh air inlet 22 and a fresh air outlet 23, wherein the fresh air fan 21 is capable of driving external fresh air to enter the fresh air driving device 2 from the fresh air inlet 22 and flow out from the fresh air outlet 23, the fresh air channel 3 having an air inlet communicating with the external environment and an air outlet communicating with the fresh air inlet 22, the fresh air outlet 23 communicating with the internal space 11 of the space body 1, the fresh air channel 3 further having an air guide return air outlet communicating with the lower region of the internal space 11, the air guide return air outlet being provided with a first filter 4, the aforementioned production space being different according to different carbon fiber production processes, for example, a precursor production workshop, a pre-oxidation workshop, a carbon fiber carbonization workshop, etc., and it can be understood that the commonality of these production spaces is that they will generate corresponding filaments (for example, precursor, pre-oxidized filament, carbonized filament, etc.) and dust.

[0024] In the technical solution, the external fresh air enters the fresh air driving device 2 through the fresh air channel 3 and is finally introduced into the internal space 11 through the fresh air outlet 23 by the operation of the fresh air fan 21 in the fresh air driving device 2, and the fresh air flows at a certain flow rate (determined by the driving power of the fresh air fan 21 and the ventilation area of the fresh air channel 3) in the fresh air channel 3 to form a vacuum at the first filter 4, that is, to form a flow of air in the internal space 11 at the air inlet and outlet, and to form a mixed air flow in the fresh air channel 3. After the air flow, on the one hand, since the air inlet and outlet is located in the lower region of the internal space 11, the first filter 4 can be used to efficiently adsorb the large-sized or heavy hair generated in the internal space 11 to the first filter 4, thereby effectively ensuring that the large-sized or heavy hair can be efficiently cleaned and ensuring the purification effect of the air in the internal space 11. On the other hand, since the fresh air flow in the present application forms an air injection effect on the air in the internal space 11, the structure design of the air purification system is simplified, and the mixed air of the fresh air and the return air can be used to preheat the fresh air introduced into the internal space 11. Especially in the case of low temperature in winter, the preheated fresh air can prevent the freezing of the pipeline in the fresh air driving device 2 and the adverse fluctuation of the temperature in the internal space 11 without the need of setting a preheating component in the fresh air driving device 2.

[0025] The first filter 4 described above can be a diamond gauze window or other filter that meets the mesh number of hair filtering and blocking. When the hair is mainly in the form of raw silk and pre-oxidized silk, it is not conductive and easy to generate static electricity. Therefore, a mesh window for static adsorption can be used, or a corresponding static adsorption structure such as a static gauze window can be further provided based on the diamond gauze window.

[0026] In one specific embodiment, the fresh air driving device 2 further comprises a second filter 241 and a third filter 242, which are arranged in front of and behind the fresh air flow path. The second filter 241 described above can be a primary efficiency filter cotton (main components are PET and PP), and the third filter 242 described above can be a medium efficiency filter cotton, so as to filter and clean the fresh air introduced into the internal space 11 and ensure the cleanliness of the introduced fresh air.

[0027] Referring to Figure 1As shown, at least one of the cold coil 25, the reheating coil 26 and the humidifying component 27 can be arranged between the second filter 241 and the third filter 242, wherein the cold coil 25 can be in communication with an external cold source medium for cooling and condensation dehumidification of the introduced fresh air, the reheating coil 26 can be a resistance wire or an external heating medium circulation, and can be controlled according to the temperature of the mixed fresh air or the temperature of the cooled fresh air to increase the temperature of the introduced air to meet the temperature requirement of the internal space 11, and the humidifying component 27 can be a steam humidifier to adjust the humidity of the introduced fresh air to meet the humidity requirement of the internal space 11. It should be particularly noted that, due to the air entraining mode of the fresh air to the internal space 11, the preheating coil and related components are no longer needed in the fresh air driving device 2, the structure of the fresh air driving device 2 is simplified, and the system cost is reduced.

[0028] The space body 1 has a bottom wall, a top wall arranged in a spaced-apart manner opposite to the bottom wall, and a side wall connected between the bottom wall and the top wall, and each wall encloses the aforementioned internal space 11 which is relatively closed. The bottom wall is provided with a floor 12, and a subsidence chamber 13 is arranged in the lower region of the floor 12. The floor 12 has a through air hole 121 extending therethrough. Under the action of the fresh air flow in the fresh air channel 3, the air in the internal space 11 at least partially enters the subsidence chamber 13 through the through air hole 121 and enters the fresh air channel 3 through the first filter 4. In this way, the air in the internal space 11 is entrained by the air flow in the fresh air channel 3, and the larger size or weight of the hair in the lower region is entrained into the subsidence chamber 13 through the through air hole 121, and the hair is accumulated and settled in the subsidence chamber 13 under the filtering action of the first filter 4, so as to ensure the cleanliness of the internal space 11 and prevent the carbonized hair dust from affecting the personnel and equipment. In a preferred embodiment, the fresh air outlet 23 is arranged on the top wall of the space body 1, so that the fresh air enters the internal space 11 from the top through the fresh air outlet 23. Since the temperature of the fresh air is generally lower than that of the internal space 11, the fresh air has a greater density and thus has a downward trend. During the downward flow, the air in the upper region of the internal space 11 is entrained by the fresh air and the smaller size or weight of the hair is eventually settled in the first filter 4, so as to achieve better air purification effect. Further, the fresh air outlet 23 is arranged on both sides of the carbon fiber production equipment 100, and does not directly blow the high-temperature carbon fiber production equipment 100, so as to avoid uneven temperature of the equipment and directly blow the fiber (tow), thereby avoiding accidents such as roll entanglement and broken wire.

[0029] In a preferred embodiment, the flow area of the through air hole 121 is Sa, and 2cm 2 ≤Sa≤3cm2 The thickness of floor 12 is h, 5cm≤h≤10cm. This creates a narrow tube-like structure in air holes 121. This narrow tube effect allows air above floor 12 to enter settling chamber 13 more quickly, further enhancing purification effectiveness and efficiency. Furthermore, the size of the aforementioned flow area ensures that people walking on it do not feel scratched or slippery.

[0030] See also Figure 3 and Figure 4 As shown, in one embodiment, the air hole 121 is in a regular hexagon, that is, in a honeycomb shape, with a large material utilization rate. The material can be selected from aluminum plate, which is corrosion-resistant and fire-resistant. The overall mass of the floor 12 can be designed to be smaller, which is convenient for its assembly and disassembly; a mounting base 14 is provided on the bottom wall, and a carbon fiber production equipment 100 is provided at the bottom of the mounting base 14. A sedimentation chamber 13 is formed between the mounting base 14 and the first side wall of the space body 1. One side of the floor 12 is supported on the mounting base 14, and the other side of the floor 12 can be supported by a floor support 122. The aforementioned floor support 122 can specifically be a support column fixedly connected to the bottom wall. The top of the support column can have a hexagonal prism, and the hexagonal prism and the air hole 121 are plugged into each other to form support and horizontal limitation for the floor 12. The aforementioned mounting base 14 can be specifically formed by pouring concrete. The aforementioned carbon fiber production equipment 100 varies depending on the specific production purpose. Specifically, it can be a raw yarn spinning production line, a pre-oxidized yarn production line or a carbonized yarn production line.

[0031] The outer surface of the floor 12 has an anti-corrosion and oil-resistant layer. Specifically, the entire surface of the floor 12 is treated with epoxy fluorocarbon paint. Taking the floor 12 made of aluminum as an example, the anti-corrosion and oil-resistant layer is achieved in the following way: the aluminum surface needs to be sandblasted to Sa2.5 level, the surface roughness is 30μm~75μm, the spray paint film thickness is 75~150μm, the spraying environment temperature is 5~40℃, and the drying time is ≥24 hours. It has the functions of anti-corrosion, acid and alkali resistance, weather resistance, and self-cleaning.

[0032] In a specific embodiment, the fresh air duct 3 is arranged on the outside of the first side wall and shares the first side wall with the space body 1. During specific manufacturing, the fresh air duct 3 can actually exist as a part of the space body 1. Of course, it can also be a component independent of the space body 1. The air inlet and return air outlet are constructed on the first side wall. In this technical solution, the fresh air duct 3 shares the first side wall with the space body 1, which simplifies the structural design of the system.

[0033] Continue to see Figure 1As shown, the side of the mounting base 14 opposite the settling chamber 13 is inclined, and the height of the inclined surface decreases from one side of the carbon fiber production equipment 100 to the side of the first filter 4. In this way, the return air flow in the internal space 11 can be guided toward the first filter 4, and the cleaning liquid can be drained when the floor 12 of the internal space 11 is cleaned. In one specific embodiment, the inclination angle of the inclined surface is 30°-60°. Further, the surface of the inclined surface toward the settling chamber 13 is provided with a self-cleaning coating, for example, a fluororesin coating, which has a self-cleaning function and can be cleaned by spraying water on the floor 12. For example, the mounting base 14 formed by pouring concrete can be formed in the following way: the surface of the concrete is kept flat, dry, and free of water seepage and accumulated water. The concrete surface can be cleaned with detergent and lye, or treated by baking or steam blowing, but the base layer must not be damaged. The concrete surface is sandblasted to Sa2.5 level, the surface roughness is 30-75 μm, the thickness of the sprayed paint film (fluororesin coating) is 75-150 μm, the spraying environment temperature is 5-40°C, and the drying time is ≥24 hours. Brushing, spraying, and rolling can be used. In some embodiments, the bottom wall of the fresh air channel 3 is provided with a drain 31, which can automatically open the drain when a certain amount of water accumulates at the bottom of the fresh air channel 3. It can be understood that the accumulated water can be sewage generated by cleaning the floor 12, or rain and snow wrapped in the fresh air.

[0034] In some embodiments, the carbon fiber production space air purification system further comprises a waste discharge device (not shown in the figure), which includes an air suction hood 51, a waste discharge fan 52, and a burning device 53. The air suction hood 51 is arranged above the carbon fiber production equipment 100, the air suction port of the waste discharge fan 52 is communicated with the air suction hood 51, and the air exhaust port of the waste discharge fan 52 is communicated with the burning device 53. In this technical solution, the air suction hood 51 is mainly arranged for the carbon fiber production equipment 100, so that the waste gas, filaments, and mixed tar generated by the equipment can be sucked and burned in the burning device 53 in time, preventing a large amount of accumulation in the internal space 11. It is worth emphasizing that the burning of the burning device 53 can carbonize the sucked filaments, and more importantly, can burn harmful gases such as hydrogen cyanide and carbon monoxide in the waste gas, and carbonize the tar to prevent pollution of the external environment. It should be noted that in order to prevent the suction force of the air suction hood 51 from disturbing the objects (original filaments, etc.) in the production equipment or even tearing them, the power of the waste discharge fan 52 cannot be too large, which results in that the size and weight of the sucked filaments are relatively small, and the filaments with large size and weight are mainly sucked by the air inlet and return air inlet of the present application. See Figure 1As shown, the aforementioned fresh air outlet 23 has at least two, and the at least two fresh air outlets 23 are respectively located at both sides of the carbon fiber production equipment 100, and also at both sides of the exhaust device, so that a wind curtain protection curtain is formed, and the protection curtain is formed at both sides of the fiber, so that as much as possible hair, tar, waste gas and the like are drawn into the incineration device by the exhaust device.

[0035] The first filter 4 has a portion higher than the floor 12, and the first filter 4 is inserted on the air inlet and air outlet, so that the first filter 4 can be easily cleaned by applying force to the portion of the first filter 4 that is higher than the floor 12.

[0036] In a specific embodiment, the aforementioned fresh air driving device 2 can be adaptively provided with two or more sets, and can be reasonably arranged according to the size of the production space.

[0037] By applying the air purification system of the present application, hair and dust are not retained in the production space, and the cleanliness of the production space is improved, wherein the cleanliness of the raw silk production workshop is controlled to be in the order of thousands, and the cleanliness of the carbon fiber production workshop is controlled to be in the order of hundreds of thousands, the frequency of electrical equipment failure caused by hair is reduced from more than 10 times / year to 0-2 times / year, the cleaning frequency of the production space is reduced from 4 times / month to 1 time / month, the labor intensity of personnel is reduced, the tensile strength CV value of the carbon fiber is less than 5%, and the performance index uniformity is good.

[0038] The present application is also applicable to downstream processing workshops such as weaving, chopping and winding of carbon fibers, and the carbon fibers are more likely to be hairy due to mutual friction between the carbon fiber tows during the processing, and the conductivity of the carbon fibers makes it unsuitable to use electrical dust removal equipment for cleaning.

[0039] Those skilled in the art will readily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0040] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications shall be regarded as the protection scope of the present application.

Claims

1. A carbon fiber production space air purification system, characterized in that: The invention comprises a space body (1), a fresh air driving device (2) and a fresh air channel (3), wherein the fresh air driving device (2) comprises a fresh air blower (21), a fresh air inlet (22) and a fresh air outlet (23), wherein the fresh air outlet (23) is constructed on the top wall of the space body (1), the air inlet of the fresh air channel (3) is connected to the external environment, the air outlet of the fresh air channel (3) is connected to the fresh air inlet (22), the fresh air outlet (23) is connected to the internal space (11) of the space body (1), and the fresh air channel (3) It also has an air inlet and an air return port connected to the lower area of ​​the internal space (11), and a first filter element (4) is provided on the air inlet and an air return port; the space body (1) has a bottom wall, a floor (12) is provided on the bottom wall, a sedimentation chamber (13) is constructed in the area below the floor (12), a mounting base (14) is provided on the bottom wall, a carbon fiber production device (100) is provided at the bottom of the mounting base (14), and a first side wall of the space body (1) is formed between the mounting base (14) and the first side wall. The settling chamber (13) has an air hole (121) passing through the floor (12) from top to bottom. The fresh air channel (3) is arranged on the outside of the first side wall and shares the first side wall with the space body (1). The air inlet and return air outlet are constructed on the first side wall. The side of the mounting base (14) opposite to the settling chamber (13) is an inclined surface. The height of the inclined surface gradually decreases from the side of the carbon fiber production equipment (100) to the side of the first filter element (4). The fresh air in the fresh air channel (3) Under the action of flow, the air in the internal space (11) at least partially enters the settling chamber (13) through the air hole (121) and enters the fresh air channel (3) through the first filter element (4), so that the air in the internal space (11) is entrained with the hair fibers through the air hole (121) under the action of the fresh air flowing in the fresh air channel (3) and enters the settling chamber (13) under the action of the filtering action of the first filter element (4).

2. The carbon fiber production space air purification system according to claim 1, characterized in that: The flow area of ​​the air hole (121) is Sa, 2cm 2 ≤Sa≤3cm 2 , the thickness of the floor (12) is h, 5cm≤h≤10cm; and / or, the outer surface of the floor (12) has an anti-corrosion and oil-resistant layer.

3. The carbon fiber production space air purification system according to claim 1, characterized in that: The air hole (121) is in the shape of a regular hexagon; and / or one side of the floor (12) is supported on the mounting base (14).

4. The carbon fiber production space air purification system according to claim 1, characterized in that: A surface of the inclined surface facing the sedimentation chamber (13) has a self-cleaning coating.

5. The carbon fiber production space air purification system according to claim 1, characterized in that: A drainage floor drain (31) is provided on the bottom wall of the fresh air channel (3).

6. The carbon fiber production space air purification system according to claim 3, characterized in that: The waste discharge device further comprises an air suction hood (51), an exhaust fan (52), and an incineration device (53). The air suction hood (51) is arranged on the carbon fiber production equipment (100), the air intake of the exhaust fan (52) is connected to the air suction hood (51), and the exhaust port of the exhaust fan (52) is connected to the incineration device (53).

7. The carbon fiber production space air purification system according to claim 1, characterized in that: The first filter element (4) has a portion higher than the floor (12), and the first filter element (4) is inserted into the air inlet and return outlet.

8. The carbon fiber production space air purification system according to claim 1, characterized in that: The fresh air driving device (2) further includes a second filter element (241) and a third filter element (242), wherein the second filter element (241) and the third filter element (242) are arranged in a front-to-rear spacing on the fresh air flow path; and / or, the fresh air driving device (2) further includes at least one of a cooling coil (25), a reheating coil (26), and a humidifying component (27).

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