Fire extinguishing device of oxidation furnace of carbon fiber production line and carbon fiber production line

Abstract

The invention discloses a fire extinguishing device for an oxidation furnace of a carbon fiber production line and the carbon fiber production line, and the fire extinguishing device comprises a pipeline system used for supplying water; the spraying head is communicated with the pipeline system and is used for spraying water into a fiber operation area of the oxidizing furnace; and the spray head is communicated with the pipeline system and is used for spraying mist into a fan chamber positioned on one side of the fiber operation area in the oxidation furnace. The spraying head is arranged on the pipeline system, water can be sprayed into the fiber operation area for cooling, fire development can be rapidly restrained, smoke can be effectively absorbed, the spraying head is further arranged on the pipeline system, spraying can be conducted on the fan chamber, the temperature in the fan chamber can be reduced, the residence time of sprayed water mist is long, and the spraying effect is good. The water consumption is small, mist can enter the fiber operation area along with hot air circulation, the temperature in the fiber operation area is further reduced, fire can be extinguished rapidly, the fire extinguishing efficiency is improved, and therefore the downtime of the oxidation furnace is shortened, the fire is prevented from spreading, and a large amount of fiber loss is avoided.

Description

Technical Field

[0001] The present invention belongs to the field of fiber production, and specifically relates to a fire extinguishing device for an oxidation furnace in a carbon fiber production line and a carbon fiber production line. Background Art

[0002] Carbon fiber is a high-strength and high-modulus high-temperature-resistant fiber, which is fired from fibers such as viscose, acrylic, aramid, and polyimide at high temperatures and belongs to a high-end variety of chemical fibers. Carbon fiber is also widely used in fields such as aerospace, automotive industry, wind power industry, construction industry, transportation, and sports equipment manufacturing due to its excellent properties.

[0003] Among many carbon fiber production equipment, the oxidation furnace and the carbonization furnace are the main equipment of the production line and also the most critical equipment. During the manufacturing process of PAN-based carbon fiber, the structure will undergo two major changes before the organic raw silk can be transformed into inorganic carbon fiber. One is during the pre-oxidation process, where the linear molecular chain of PAN is transformed into a pre-oxidized fiber with a heat-resistant ladder structure, and the other is during the carbonization process, where the ladder structure is transformed into a disordered graphite structure of carbon fiber.

[0004] During the pre-oxidation process, the main reactions are cyclization, oxidation, and dehydrogenation, all of which are exothermic reactions, and the furnace is always at a process temperature of 200°C - 300°C. Therefore, heat accumulation and overheating are likely to occur inside the fiber, which can cause the melting and merging between single filaments at the least, black smoke at the worst, and even ignition. Once the pre-oxidation furnace catches fire, the fire spreads too fast and fiercely, and the flame will burst out from the furnace mouth in an explosion-like manner, increasing the safety hazards for on-site personnel. Moreover, the raw silk is a highly flammable material. If the fire cannot be extinguished in a timely and effective manner, the flame will spread to the wire rack and ignite the raw silk, with unimaginable consequences.

[0005] To avoid such situations, fire-fighting and extinguishing devices are installed in pre-oxidation furnaces: some fire-fighting and extinguishing devices are not scientifically installed, only considering dealing with the fire in the fiber running area, but ignoring the temperature reduction operation in other areas of the pre-oxidation furnace, increasing the loss of equipment such as heaters; even some simply use manual monitoring of the fire warning situation in the pre-oxidation furnace, but due to the limitations of manual monitoring, major fires occur. All of the above result in the inability to extinguish the fire in a timely and effective manner, and it is extremely easy for the flame to spread.

[0006] In view of this, the present invention is specifically proposed. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art. The purpose is to solve at least one of the above problems. A spray head is provided, which can spray water to cool and extinguish fire in the fiber running area of the oxidation furnace. A mist spray head is also provided, which can spray mist into the fan chamber in the oxidation furnace, capable of reducing the temperature in the fan chamber, and the mist can enter the fiber running area along with the hot air circulation, further reducing the temperature in the fiber running area, being able to quickly extinguish the fire and ensure the safety of the production line.

[0008] Another object of the present invention is to provide a production line for carbon fiber.

[0009] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: to provide a fire extinguishing device for an oxidation furnace of a carbon fiber production line, including

[0010] A pipeline system for supplying water;

[0011] A spray head, which is communicated with the pipeline system and is used for spraying water into the fiber running area of the oxidation furnace;

[0012] A mist spray head, which is communicated with the pipeline system and is used for spraying mist into the fan chamber located on one side of the fiber running area in the oxidation furnace.

[0013] The fire extinguishing device of the present invention is provided with a spray head on the pipeline system, which can spray water to cool and extinguish fire in the fiber running area of the oxidation furnace. A mist spray head is also provided, which can spray mist into the fan chamber in the oxidation furnace, capable of reducing the temperature in the fan chamber, and the mist can enter the fiber running area along with the hot air circulation, further reducing the temperature in the fiber running area, being able to quickly extinguish the fire, improve the fire extinguishing efficiency, thereby shortening the shutdown time of the oxidation furnace, preventing the spread of the fire, and also preventing the burning of a large area of carbon fiber and avoiding a large amount of fiber loss.

[0014] Furthermore, it also includes

[0015] A temperature detection module for detecting the temperature in the oxidation furnace;

[0016] A controller, which is respectively connected to the temperature detection module, the spray head and the mist spray head, and is used for receiving the temperature detected by the temperature detection module and controlling the opening and closing of the spray head and the mist spray head according to the detected temperature.

[0017] Furthermore, the controller includes

[0018] A storage unit storing temperature set values, including a first temperature set value Ta and a second temperature set value Tb;

[0019] A comparison unit, which is respectively connected to the storage unit and the temperature detection module, and is used for obtaining the detected temperature and the temperature set value, and comparing the detected temperature T with the first temperature set value Ta and the second temperature set value Tb respectively;

[0020] A control unit, which is respectively connected to the comparison unit and the pipeline system, is configured to receive the comparison result of the comparison unit and, when the detected temperature T is successively higher than the first temperature set value Ta and the second temperature set value Tb, control the spray head to spray water and the atomizing head to spray mist in sequence, and control the spray head and the atomizing head to stop working when the temperature is lower than the first temperature set value Ta, where Ta < Tb.

[0021] Further, the temperature detection module includes a first temperature detection unit and a second temperature detection unit, which are configured to respectively detect the temperature T1 in the fiber running area and the temperature T2 in the fan room.

[0022] The comparison unit compares the detected temperature T1 in the fiber running area with the first temperature set value Ta, and when the detected temperature T1 is greater than or equal to the first temperature set value Ta, the control unit controls the spray head to work.

[0023] The comparison unit compares the detected temperature T2 in the fan room with the first temperature set value Ta and the second temperature set value Tb respectively. When the detected temperature T2 is greater than or equal to the first temperature set value Ta and less than the second temperature set value Tb, the control unit controls the spray head to work; when the detected temperature T2 is greater than or equal to the second temperature set value Tb, the control unit controls the spray head and the atomizing head to work.

[0024] Further, the pipeline system includes

[0025] A water supply pipeline, which is used to supply water to the spray head and the atomizing head.

[0026] An automatic control valve, which is connected in series on the water supply pipeline and is in communication connection with the controller, and is configured to receive the instruction of the controller to control the opening and closing of the water supply pipeline.

[0027] A manual control valve, which is connected in parallel with the automatic control valve between the water inlet end and the water outlet end of the water supply pipeline, is located above the automatic control valve, and is used to manually control the opening and closing of the water supply pipeline.

[0028] Further, the water inlet end and the water outlet end of the water supply pipeline are recessed, and the automatic control valve is arranged at the bottom of the recessed part of the water supply pipeline.

[0029] The water supply pipeline includes a connecting pipeline, which is arranged above the automatic control valve and is connected between the water inlet end and the water outlet end of the recessed part of the water supply pipeline, and the manual control valve is arranged on the connecting pipeline.

[0030] Further, the water supply pipeline further includes a U-shaped pipe. The connecting pipeline is connected between the middle parts of the two vertical pipes of the U-shaped pipe. The automatic control valve is arranged on the vertical bottom of the U-shaped pipe.

[0031] A drain valve that can be opened and closed is arranged at the bottom of the U-shaped pipe for draining the water in the water supply pipeline after being opened.

[0032] Further, there are two water supply pipelines fixedly connected in parallel. The water inlet ends of the two water supply pipelines extend downward and are arranged adjacent to each other. The water outlet ends of the two water supply pipelines are arranged in opposite directions, located on the two outer sides of the water inlet ends of the two water supply pipelines, and are respectively connected to the spray heads and the sprinkler heads in one-to-one correspondence.

[0033] A water supply source, and the water inlet ends of the two water supply pipelines are respectively connected to the water supply source.

[0034] A connecting plate is horizontally connected between the outer walls of the adjacent vertical pipelines at the water inlet ends of the two water supply pipelines for fixing the water supply pipelines.

[0035] The present invention also provides a production line of carbon fiber, which has the fire extinguishing device described in any one of the above.

[0036] Further, it also includes

[0037] Multiple oxidation furnaces are arranged in parallel along the running direction of the tow. Each oxidation furnace has a fiber running area and a fan chamber. The fan chamber is communicated with the outside, and is provided with a fan and a heater for heating air after intake and then circulating hot air between the fan chamber and the fiber running area.

[0038] Each oxidation furnace is provided with a fire extinguishing device. The sprinkler head is arranged in the fiber running area of the oxidation furnace, and the spray head is arranged in the fan chamber of the oxidation furnace and is arranged opposite to the heater.

[0039] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0040] The fire extinguishing device of the present invention is provided with a sprinkler head on the pipeline system, which can spray water to cool down and extinguish the fire in the fiber running area of the oxidation furnace. A spray head is also provided, which can spray into the fan chamber of the oxidation furnace, can reduce the temperature in the fan chamber, and the mist can enter the fiber running area along with the hot air circulation to further reduce the temperature in the fiber running area, can quickly extinguish the fire, improve the fire extinguishing efficiency, thus shortening the shutdown time of the oxidation furnace, preventing the spread of the fire, also preventing the burning of a large area of carbon fiber, and avoiding a large amount of fiber loss.

[0041] Combining spraying and atomizing, the spraying has high fire extinguishing efficiency, can quickly suppress the development of fire, and can effectively absorb smoke. The atomizing has good diffusion effect, long residence time of water mist after spraying, and less water consumption. The combination of the two can flexibly cope with different fire situations. The positions of the spray heads and atomizing heads are scientifically distributed, which can not only effectively extinguish the fire, but also cool down the heater, preventing the oxidation furnace from being damaged due to excessive fire temperature. It can also cool down in time to avoid the furnace flame spraying out of the outlet and endangering the personal safety of the staff.

[0042] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts. In the drawings:

[0044] Figure 1 is a schematic diagram of an oxidation furnace of the present invention;

[0045] Figure 2 is a schematic structural diagram of a fire extinguishing device of an oxidation furnace of the present invention;

[0046] Figure 3 is a schematic diagram of the communication connection of a fire extinguishing device of an oxidation furnace of the present invention;

[0047] Figure 4 is a schematic diagram of a pipeline system of the present invention;

[0048] Figure 5 is the present invention Figure 2 a schematic diagram from another angle;

[0049] Figure 6 is the present invention Figure 2 a schematic diagram from yet another angle;

[0050] Figure 7 is a schematic diagram of a spray head of the present invention;

[0051] Figure 8 is a schematic diagram of an atomizing head of the present invention.

[0052] In the figure: 1. Oxidation furnace; 11. Fiber running area; 12. Fan room; 13. Fan; 14. Heater; 2. Pipeline system; 21. Water supply pipeline; 211. Water distribution pipe; 22. Automatic control valve; 23. Manual control valve; 24. Connecting pipeline; 25. Drain valve; 26. Connecting plate; 27. Water supply source; 3. Spray head; 4. Atomizing head.

[0053] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by reference to specific embodiments. Detailed implementation manners

[0054] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] As Figures 1 to 8 shown, the present invention provides a fire extinguishing device for an oxidation furnace 1 of a carbon fiber production line.

[0058] As Figures 1 to 2 shown, among which Figure 2 is a top view of the fire extinguishing device for the oxidation furnace 1. The oxidation furnace 1 is a device for pre-oxidizing or carbonizing carbon fibers. Inside the oxidation furnace 1, there are an adjacent fiber running area 11 and a blower chamber 12. The fiber running area 11 is provided with an inlet and an outlet, and multiple bundles of carbon fiber filaments are drawn into the fiber running area 11 of the oxidation furnace 1 from the inlet by external traction rollers.

[0059] The blower chamber 12 is provided with a blower 13 and a heater 14. The blower 13 introduces air from the outside, heats it through the heater 14, and then conducts it into the fiber running area 11. Hot air circulates between the blower chamber 12 and the fiber running area 11 to continuously heat and oxidize the carbon fiber filaments. The generated waste gas circulates into the blower chamber 12 and is discharged from the blower chamber 12.

[0060] The fire extinguishing device includes a pipeline system 2, a spray head 3, and a spray nozzle 4.

[0061] The pipeline system 2 is used for water supply. The spray head 3 is connected to the pipeline system 2 and is used for spraying water to cool down the fiber running area 11 in the oxidation furnace 1. The spray nozzle 4 is connected to the pipeline system 2 and is used for spraying mist to cool down the fan chamber 12 on one side of the fiber running area 11 in the oxidation furnace 1.

[0062] In the fire extinguishing device of the present invention, a spray head 3 is arranged on the pipeline system 2, which can spray water to cool down and extinguish the fire in the fiber running area 11 in the oxidation furnace 1. A spray nozzle 4 is also arranged, which can spray mist into the fan chamber 12 in the oxidation furnace 1, capable of reducing the temperature in the fan chamber 12, and the mist can enter the fiber running area 11 along with the hot air circulation, further reducing the temperature in the fiber running area 11, capable of quickly extinguishing the fire, improving the fire extinguishing efficiency, thus shortening the shutdown time of the oxidation furnace 1, preventing the spread of the fire, preventing the large - area burning of carbon fiber, and avoiding a large amount of fiber loss.

[0063] The combination of spraying and mist - spraying has a high fire extinguishing efficiency of spraying, can quickly suppress the development of the fire, and can effectively absorb the flue gas. The mist - spraying has a good diffusion effect, a long residence time of the water mist after spraying, and less water consumption. The combination of the two can flexibly cope with different fire situations. The positions of the spray head 3 and the spray nozzle 4 are scientifically distributed, which can not only effectively extinguish the fire but also cool down the heater 14, preventing the oxidation furnace 1 from being damaged due to excessive fire temperature. It can also cool down in time to avoid the flame in the furnace spraying out of the outlet and endangering the personal safety of the staff.

[0064] As Figure 3 shown, the fire extinguishing device further includes a temperature detection module and a controller.

[0065] The temperature detection module is used for detecting the temperature in the oxidation furnace 1. The controller is respectively connected to the temperature detection module, the spray head 3, and the spray nozzle 4, and is used for receiving the temperature detected by the temperature detection module and controlling the opening and closing of the spray head 3 and the spray nozzle 4 according to the detected temperature.

[0066] By setting the temperature detection module and the controller, the present invention realizes the automation of the fire extinguishing device. The temperature detection module is used to detect the temperature in the oxidation furnace 1, and the controller can timely control the opening and closing of the spray head 3 and the spray nozzle 4 according to the detected temperature, and extinguish the fire in a timely and effective manner.

[0067] Furthermore, the controller includes a storage unit, a comparison unit, and a control unit.

[0068] The storage unit stores temperature set values, including a first temperature set value Ta and a second temperature set value Tb.

[0069] The comparison unit is respectively connected to the storage unit and the temperature detection module, and is used to obtain the detected temperature T and the temperature set value, and compare the detected temperature T with the first temperature set value Ta and the second temperature set value Tb respectively.

[0070] The control unit is respectively connected to the comparison unit and the pipeline system 2, and is used to receive the comparison result of the comparison unit. When the detected temperature T is successively higher than the first temperature set value Ta and the second temperature set value Tb, it controls the spray head 3 to spray water and the atomizing head 4 to spray mist in sequence. When it is lower than the first temperature set value Ta, it controls the spray head 3 and the atomizing head 4 to stop working, where Ta < Tb.

[0071] Preferably, the temperature set value is based on the safe temperature of the fiber operation. Preferably, the first temperature set value Ta is 6 degrees higher than the safety upper limit temperature, and the second temperature set value Tb is 8 degrees higher than the safety upper limit temperature.

[0072] If the fire extinguishing device is controlled only by some single interlock signals, it is easy to have the problem that the fire extinguishing spray is triggered frequently, which has a great impact on the continuity of production.

[0073] To solve the above technical problems, the temperature detection module of the present invention includes a first temperature detection unit and a second temperature detection unit, which are used to respectively detect the temperature T1 in the fiber operation area 11 and the temperature T2 in the fan room 12.

[0074] The comparison unit compares the detected temperature T1 in the fiber operation area 11 with the first temperature set value Ta: when the detected temperature T1 is greater than or equal to the first temperature set value Ta, the control unit controls the spray head 3 to work; when the detected temperature T1 is less than the first temperature set value Ta, the spray head 3 and the atomizing head 4 do not work.

[0075] The comparison unit compares the detected temperature T2 in the fan room 12 with the first temperature set value Ta and the second temperature set value Tb respectively: when the detected temperature T2 is greater than or equal to the first temperature set value Ta and less than the second temperature set value Tb, the control unit controls the spray head 3 to work; when the detected temperature T2 is greater than or equal to the second temperature set value Tb, the control unit controls the spray head 3 and the atomizing head 4 to work; when the detected temperature T2 is less than the first temperature set value Ta, the spray head 3 and the atomizing head 4 do not work.

[0076] In the present invention, the temperature T1 detected by the first temperature detection unit and the temperature T2 detected by the second temperature detection unit are respectively independently judged. After any detected temperature exceeds the temperature set value, it controls the spray water or spray to cool down, which can increase the detection area, capture the fire elements more accurately, ensure that the fire extinguishing substance can quickly cover the flame area, prevent the occurrence of fire, and extinguish the fire quickly and effectively.

[0077] Preferably, the first temperature detection unit and the second temperature detection unit are temperature sensors.

[0078] As Figures 4 to 8 As shown, the pipeline system 2 includes a water supply pipeline 21, an automatic control valve 22, and a manual control valve 23.

[0079] The water supply pipeline 21 is used to supply water to the spray head 3 and the atomizing head 4.

[0080] The automatic control valve 22 is connected in series on the water supply pipeline 21 and is in communication connection with the controller, and is used to receive the instruction of the controller to control the opening and closing of the water supply pipeline 21.

[0081] The manual control valve 23 is connected in parallel with the automatic control valve 22 between the water inlet end and the water outlet end of the water supply pipeline 21, and is located above the automatic control valve 22, and is used to manually control the opening and closing of the water supply pipeline 21. When the detected temperature drops below the temperature set value, the fire extinguishing device can be closed again through the manual control valve 23.

[0082] The fire extinguishing device of the present invention is provided with an automatic control valve 22, which can open the water supply pipeline 21 for water inlet cooling under the control instruction of the controller, and automatically control the cooling or fire extinguishing; the present invention also sets a manual control valve 23. When the automatic execution valve cannot meet the needs, the manual control valve 23 is opened, and it can be switched to manual operation to cope with the sudden situation in the furnace; the manual control valve 23 is located above the automatic control valve 22. When the manual control valve 23 is opened, a large amount of water will enter the parallel pipeline where the manual control valve 23 is located at a high place, which is convenient for the staff to operate the manual control valve 23 and quickly realize the fire extinguishing of the oxidation furnace 1. Or, it can be switched to manual control when the automatic control valve 22 fails, and the operation is more flexible and reliable; the cooperation of the automatic control valve 22 and the manual control valve 23 can more accurately and reliably capture the ignition elements in the furnace, quickly reduce the temperature of the air in the pre-oxidation furnace 1, avoid shutdown due to the too high temperature of the pre-oxidation furnace 1, shorten the unplanned shutdown time, reduce the waste filament rate of carbon fiber, avoid excessive waste of raw materials, save water consumption, and reduce production costs.

[0083] And ensure that at least one pipeline of the fire extinguishing device can operate normally in an emergency state, prevent the fibers in the pre-oxidation furnace 1 from being completely burned out, and eliminate potential safety hazards.

[0084] Preferably, the controller is in wireless communication connection with the automatic control valve 22.

[0085] The thick lining made of the automatic control valve 22 and its accessories can ensure the best penetration protection. With a double shaft seal, maximum operating safety can be provided, even for corrosive and toxic media.

[0086] Preferably, the pipeline between the water inlet end and the water outlet end of the water supply pipeline 21 is recessed, and the automatic control valve 22 is arranged at the bottom of the recessed part of the water supply pipeline 21.

[0087] The water supply pipeline 21 includes a connecting pipeline 24, which is arranged above the automatic control valve 22. The connecting pipeline 24 is connected between the water inlet end and the water outlet end of the recessed part of the water supply pipeline 21. The manual control valve 23 is arranged on the connecting pipeline 24.

[0088] In the present invention, by arranging the automatic control valve 22 on the recessed part of the water supply pipeline 21, adding a connecting pipeline 24 above the automatic control valve 22, and arranging the manual control valve 23 on the connecting pipeline 24, the manual control valve 23 and the automatic control valve 22 can be cooperatively arranged. When the manual control valve 23 is opened, water flows through the pipeline where the manual control valve 23 is located above, quickly flows into the connecting pipeline 24 and then flows to the spray head 3 or the atomizing head 4, facilitating quick water discharge. Moreover, the volume of the water supply pipeline 21 can be reduced, thereby saving the occupied space of the pipeline system 2 and facilitating its installation on the oxidation furnace 1.

[0089] A specific implementation scheme is that the water supply pipeline 21 further includes a U-shaped pipe.

[0090] The connecting pipeline 24 is connected between the middle parts of the two vertical pipes of the U-shaped pipe. The automatic control valve 22 is arranged at the bottom of the vertical pipe section of the U-shaped pipe. A drain valve 25 that can be opened and closed is provided at the bottommost part of the U-shaped pipe for draining the water in the water supply pipeline 21 after being opened.

[0091] As Figures 4 to 6 shown, where Figure 5 is a view outside the fiber running area 11 side of the oxidation furnace 1, Figure 6 is a view outside the blower chamber 12 side of the oxidation furnace 1. The fire extinguishing device includes two water supply pipelines 21 fixedly connected side by side, a water supply source 27, and a connecting plate 26. The two water supply pipelines 21 fixedly connected side by side are arranged on the outer wall of the oxidation furnace 1 on the side of the fiber running area 11.

[0092] The water inlet ends of the two water supply pipelines 21 extend downward adjacent to each other. The water outlet ends of the two water supply pipelines 21 are arranged in opposite directions and are located on the two outer sides of the water inlet ends of the two water supply pipelines 21. The water outlet ends of the two water supply pipelines 21 are respectively connected with a water distribution pipe 211, which is in one-to-one correspondence and communication with the spray head 4 and the spray head 3.

[0093] The water inlet ends of the two water supply pipelines 21 are respectively communicated with the water supply source 27. The connecting plate 26 is horizontally connected between the outer walls of the adjacent vertical pipelines at the water inlet ends of the two water supply pipelines 21 for fixing the water supply pipelines 21.

[0094] The present invention also provides a carbon fiber production line having any of the above-mentioned fire extinguishing devices.

[0095] The carbon fiber production line also includes a multi-section oxidation furnace 1 arranged in parallel along the running direction of the fiber bundle.

[0096] Each oxidation furnace 1 has a fiber running area 11 and a fan chamber 12 . The fan chamber 12 is communicated with the outside and is provided with a fan 13 and a heater 14 for circulating hot air between the fiber running area 11 after the air is heated by air intake.

[0097] Each section of the oxidation furnace 1 is provided with a fire extinguishing device, the spray head 3 is arranged in the fiber running area 11, and the spray head 4 is arranged in the fan room 12, opposite to the heater 14. Each section of the oxidation furnace 1 has two temperature sensors, one is arranged in the fiber running area 11, and the other is arranged in the fan room 12.

[0098] Each section of the oxidation furnace 1 is provided with at least two independent areas along the running direction of the tow, and each area has an adjacent fiber running area 11 and a fan chamber 12. The fiber running area 11 is provided with an inlet and an outlet, and a plurality of carbon fiber tows are pulled from the inlet into the fiber running area 11 of the oxidation furnace 1 by an external pulling roller, and pulled out from the outlet after oxidation.

[0099] The fan room 12 is provided with a fan 13 and a heater 14. The fan 13 introduces air from the outside and heats it into hot air through the heater 14. A partition wall is provided between the fan room 12 and the fiber running area 11, and two connecting ports are provided on the partition wall. The hot air is introduced from the fan room 12 into the fiber running area 11, circulates between the fan room 12 and the fiber running area 11, and continuously heats and oxidizes the carbon fiber tow. The waste gas generated by oxidation circulates into the fan room 12 and is discharged from the fan room 12.

[0100] The two water supply pipelines 21 fixedly connected side by side are the first water supply pipeline and the second water supply pipeline, which are connected to the spray head 3 and the spray head 4 respectively. The U-shaped pipe of the water supply pipeline 21 is vertically arranged outside the side wall of the oxidation furnace 1. The connecting pipe 24 is horizontally extended and arranged between the vertical middle parts of the U-shaped pipe.

[0101] Two spray heads 3 are provided in the fiber running area 11 of each area, and the spray heads 3 of multiple areas are connected together through the water distribution pipe 211. When any control valve of the first water supply pipeline is opened, the multiple spray heads 3 in multiple areas spray water.

[0102] A spray head 4 is provided in the fan chamber 12 of each area, and the spray heads 4 of multiple areas are connected together through another water distribution pipe 211. When any control valve of the second water supply pipeline is opened, the multiple spray heads 4 in multiple areas spray water.

[0103] Preferably, the oxidation furnace 1 is a pre-oxidation furnace 1. Each section of the pre-oxidation furnace 1 has two zones.

[0104] Taking a single-section pre-oxidation furnace 1 catching fire as an example: The temperature sensor detects the temperature inside the pre-oxidation furnace 1 and transmits it to the controller. When the controller recognizes that the detected temperature is higher than the second temperature setting value Tb, it immediately automatically activates the fire extinguishing device. The 4 spray nozzles 3 in the fiber running zones 11 of the two zones are opened to release liquid water, quickly covering the fiber running zones 11, timely controlling the fire so as to ensure that the fiber filament path can operate normally and reduce the waste filament rate; the 2 spray nozzles 4 in the fan rooms 12 of the two zones are opened to release atomized water. Under the circulating action of the fan 13, the atomized water pervades the entire fan room 12, cooling both the fan room 12 and the heater 14. Moreover, the atomized water will also enter the fiber running zones 11 along with the circulating hot air, enhancing the fire extinguishing and cooling effect in the fiber running zones 11. After the fire is extinguished, the controller recognizes that the temperature inside the furnace is lower than the first temperature setting value Ta, and immediately automatically shuts down the fire extinguishing device. This can not only avoid the pre-oxidation furnace 1 from shutting down due to abnormal temperature, but also prevent the operation of the fiber filament path from deviating significantly from the normal range, improving production efficiency and eliminating potential safety hazards.

[0105] As Figures 7 to 8 shown, the spray nozzles 3 and the spray nozzles 4 are respectively connected to the corresponding water distribution pipes 211 by threaded connections, which are simple and convenient to install, have stable end face seals, and do not require complex maintenance procedures.

[0106] Preferably, the spray nozzles 3 are spherical spray nozzles and use the internal screw connection method with screw threads. The spray nozzles 4 are conical spray nozzles and use the external screw connection method with screw threads.

[0107] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the technical solution scope of the present invention, can make some changes or modifications to equivalent embodiments by using the technical content prompted above. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. A fire extinguishing device for an oxidation furnace in a carbon fiber production line, characterized in that: It includes a pipeline system for supplying water; a spray head, connected to the pipeline system, for spraying water into the fiber running area of the oxidation furnace; a mist spray head, connected to the pipeline system, for spraying mist into the blower chamber on one side of the fiber running area in the oxidation furnace.

2. The fire extinguishing device for an oxidation furnace in a carbon fiber production line according to claim 1, characterized in that: It further includes a temperature detection module for detecting the temperature inside the oxidation furnace; a controller, respectively connected to the temperature detection module, the spray head and the mist spray head, for receiving the temperature detected by the temperature detection module and controlling the opening and closing of the spray head and the mist spray head according to the detected temperature.

3. The fire extinguishing device for an oxidation furnace in a carbon fiber production line according to claim 2, characterized in that: The controller includes a storage unit storing temperature set values, including a first temperature set value Ta and a second temperature set value Tb; a comparison unit, respectively connected to the storage unit and the temperature detection module, for obtaining the detected temperature and the temperature set values, and comparing the detected temperature T with the first temperature set value Ta and the second temperature set value Tb respectively; a control unit, respectively connected to the comparison unit and the pipeline system, for receiving the comparison result of the comparison unit, and when the detected temperature T is successively higher than the first temperature set value Ta and the second temperature set value Tb, successively controlling the spray head to spray water and the mist spray head to spray mist, and when it is lower than the first temperature set value Ta, controlling the spray head and the mist spray head to stop working, where Ta < Tb.

4. The fire extinguishing device for an oxidation furnace in a carbon fiber production line according to claim 3, characterized in that: The temperature detection module includes a first temperature detection unit and a second temperature detection unit for respectively detecting the temperature T1 in the fiber running area and the temperature T2 in the blower chamber; The comparison unit compares the detected temperature T1 in the fiber running area with the first temperature set value Ta, and when the detected temperature T1 is greater than or equal to the first temperature set value Ta, the control unit controls the spray head to work; The comparison unit compares the detected temperature T2 in the blower chamber with the first temperature set value Ta and the second temperature set value Tb respectively. When the detected temperature T2 is greater than or equal to the first temperature set value Ta and less than the second temperature set value Tb, the control unit controls the spray head to work; when the detected temperature T2 is greater than or equal to the second temperature set value Tb, the control unit controls the spray head and the mist spray head to work.

5. The fire extinguishing device for an oxidation furnace in a carbon fiber production line according to any one of claims 2-4, characterized in that: The pipeline system includes a water supply pipeline for supplying water to the spray head and the mist spray head; an automatic control valve, connected in series on the water supply pipeline, in communication connection with the controller, for receiving the instruction of the controller to control the opening and closing of the water supply pipeline; a manual control valve, connected in parallel with the automatic control valve between the water inlet end and the water outlet end of the water supply pipeline, located above the automatic control valve, for manually controlling the opening and closing of the water supply pipeline.

6. An extinguishing device for an oxidation furnace of a carbon fiber production line according to claim 5, characterized in that: The water inlet end and the water outlet end of the water supply pipeline are recessed, and the automatic control valve is arranged at the bottom of the recessed part of the water supply pipeline; The water supply pipeline includes a connecting pipeline, which is arranged above the automatic control valve and connects the water inlet end and the water outlet end of the recessed part of the water supply pipeline. The manual control valve is arranged on the connecting pipeline.

7. An extinguishing device for an oxidation furnace of a carbon fiber production line according to claim 6, characterized in that: The water supply pipeline further includes a U-shaped pipe. The connecting pipeline is connected between the middle parts of the two vertical pipes of the U-shaped pipe. The automatic control valve is arranged on the vertical bottom of the U-shaped pipe; A drain valve that can be opened and closed is arranged at the bottom of the U-shaped pipe for draining the water in the water supply pipeline after being opened.

8. An extinguishing device for an oxidation furnace of a carbon fiber production line according to claim 5, characterized in that: Two water supply pipelines fixedly connected side by side. The water inlet ends of the two water supply pipelines extend downward and are adjacent to each other; the water outlet ends of the two water supply pipelines are arranged in opposite directions, on the two outer sides of the water inlet ends of the two water supply pipelines, and are respectively connected to the spray heads and the sprinkler heads in one-to-one correspondence; A water supply source, and the water inlet ends of the two water supply pipelines are respectively connected to the water supply source; A connecting plate, which is horizontally connected between the outer walls of the adjacent vertical pipelines at the water inlet ends of the two water supply pipelines for fixing the water supply pipelines.

9. A production line for carbon fiber, characterized in that: It has the extinguishing device according to any one of claims 1-8.

10. A production line for carbon fiber according to claim 9, characterized in that: It further includes, Multiple sections of oxidation furnaces are arranged in parallel along the running direction of the tow. Each section of oxidation furnace has a fiber running area and a fan chamber. The fan chamber is communicated with the outside and is provided with a fan and a heater for heating air and then circulating hot air between the fan chamber and the fiber running area; Each section of oxidation furnace is provided with an extinguishing device. The sprinkler head is arranged in the fiber running area, and the spray head is arranged in the fan chamber and is arranged opposite to the heater.

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