CN109553097B - Graphite production line and continuous graphitizing furnace thereof - Google Patents
Graphite production line and continuous graphitizing furnace thereof Download PDFInfo
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- CN109553097B CN109553097B CN201910117111.3A CN201910117111A CN109553097B CN 109553097 B CN109553097 B CN 109553097B CN 201910117111 A CN201910117111 A CN 201910117111A CN 109553097 B CN109553097 B CN 109553097B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 98
- 239000010439 graphite Substances 0.000 title claims abstract description 98
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 34
- 239000004917 carbon fiber Substances 0.000 claims abstract description 34
- 238000004321 preservation Methods 0.000 claims abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000017525 heat dissipation Effects 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000007664 blowing Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 19
- 239000011229 interlayer Substances 0.000 claims description 15
- 238000005087 graphitization Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 127
- 239000010410 layer Substances 0.000 description 26
- 238000009413 insulation Methods 0.000 description 14
- 229910021385 hard carbon Inorganic materials 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 13
- 230000001681 protective effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 229910021384 soft carbon Inorganic materials 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000006698 induction Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Abstract
The invention discloses a continuous graphitizing furnace, which comprises: the furnace body is used for generating graphite by carbon fiber reaction; furnace covers connected with two ends of the furnace body; the traction winding machine is arranged at the outer end of the furnace cover and used for traction and driving carbon fibers into the furnace body; wherein, be equipped with in the furnace body: a graphite crucible for reacting carbon fibers to form graphite; two heat preservation doors which are respectively arranged at the inlet and the outlet of the graphite crucible and used for avoiding heat dissipation in the graphite crucible. The continuous graphitizing furnace has the advantages of simple structure and good heat preservation, and solves the problem that a large amount of electric energy is required to be consumed additionally. In addition, the invention also discloses a graphite production line comprising the continuous graphitization furnace.
Description
Technical Field
The invention relates to the technical field of graphite production, in particular to a continuous graphitization furnace. In addition, the invention also relates to a graphite production line comprising the continuous graphitization furnace.
Background
A continuous graphitization furnace is a process furnace that produces graphitized articles in a continuous output mode. At present, most continuous graphitization furnaces have poor heat preservation and high energy consumption. In particular, the heat in the crucible for producing graphite is easily lost along the passage through which the carbon fibers pass in and out, and in order to ensure that the temperature in the crucible is maintained at the operating temperature, a large amount of electric energy is consumed or an additional heat generating device is provided to compensate for the heat energy lost from the crucible. In addition, the continuous graphitization furnace has the defects of poor sealing performance and short service life.
Therefore, how to provide a continuous graphitization furnace with better heat preservation and low energy consumption is a problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention aims to provide a continuous graphitizing furnace which has a simple structure and good heat preservation, and solves the problem that a large amount of electric energy is required to be consumed additionally. Another object of the present invention is to provide a graphite production line comprising the continuous graphitization furnace described above.
In order to achieve the above object, the present invention provides a continuous graphitizing furnace comprising: the furnace body is used for generating graphite by carbon fiber reaction; furnace covers connected with two ends of the furnace body; the traction winding machine is arranged at the outer end of the furnace cover and used for traction and driving carbon fibers into the furnace body; wherein, be equipped with in the furnace body: a graphite crucible for reacting carbon fibers to form graphite; two heat preservation doors which are respectively arranged at the inlet and the outlet of the graphite crucible and used for avoiding heat dissipation in the graphite crucible.
Preferably, the furnace further comprises two gas sealing devices which are respectively connected with the two furnace covers and used for preventing air from entering the furnace body, and brackets which are respectively connected with the two gas sealing devices and used for supporting the gas sealing devices.
Preferably, the gas sealing device comprises: a channel for transporting carbon fibers; the gas distributor is arranged on the bracket and used for protecting gas to enter; and the air outlet pipe is connected with the air distributor and used for blowing protective air into the channel.
Preferably, the base of the gas sealing device is provided with a first water-cooling interlayer for cooling the circulating water; the cover plate of the gas sealing device is provided with a second water-cooling interlayer for cooling the circulating water.
Preferably, the outer end of the gas sealing device is further provided with a plugging device for plugging the channel port.
Preferably, the furnace further comprises a rectangular air blowing pipe which is arranged on the inner side of the furnace cover and used for blowing protective gas into the channel and the furnace body; wherein the air inlet of the rectangular air blowing pipe penetrates through the furnace cover and is connected with the air distributor.
Preferably, the air inlet of the rectangular air blowing pipe is provided with: a valve for adjusting the amount of shielding gas entering the rectangular insufflation tube; and a gas flow meter to detect the amount of shielding gas entering the rectangular insufflation tube.
Compared with the background art, the continuous graphitization furnace provided by the invention has the advantages that the heat preservation door is arranged at the inlet and the outlet of the graphite crucible so as to reduce heat loss from the graphite crucible. Specifically, on the basis of enabling carbon fibers to enter and graphite products to be output, the heat insulation door prevents heat from losing from the inlet and outlet of the graphite crucible, so that consumption of electric energy can be reduced.
The invention also provides a graphite production line, which comprises a vacuum pump and a reactive compensation device, and further comprises a continuous graphitizing furnace which is connected with the vacuum pump and the reactive compensation device and is any one of the above.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a continuous graphitizing furnace according to the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view in the direction A-A of FIG. 1;
FIG. 4 is a schematic view showing the structure of the graphite crucible of FIG. 1;
FIG. 5 is a schematic diagram of the flow of gases in a continuous graphitizing furnace according to the present invention;
FIG. 6 is a schematic view of a gas seal device according to the present invention;
FIG. 7 is a schematic diagram of the flow of gas in a gas seal provided by the present invention;
FIG. 8 is a schematic view of the gas flow of the gas inlet pipe in the chamber of the gas seal device provided by the invention;
FIG. 9 is a schematic view of the water-cooled interlayer of the cover plate and base of FIG. 6;
FIG. 10 is a schematic view of the occluding device of FIG. 6;
FIG. 11 is a front view of section I of FIG. 5;
FIG. 12 is a top view of section I of FIG. 5;
FIG. 13 is a front view of a rectangular insufflation tube provided by the present invention;
FIG. 14 is a top view of a rectangular insufflation tube provided by the present invention;
FIG. 15 is a side view of a rectangular insufflation tube provided by the present invention;
FIG. 16 is a schematic view of a graphite production line according to the present invention;
Wherein,
The furnace comprises a 1-furnace body, a 11-graphite crucible, a 111-heat insulation door, a 12-hard carbon felt heat insulation layer, a 13-soft carbon felt heat insulation layer, a 14-insulating layer, a 15-induction coil, a 16-vacuum port, a 2-furnace cover, a 21-temperature measuring port, a 3-gas sealing device, a 31-gas distributor, a 32-gas outlet pipe, a 33-cover plate, a 331-first water inlet, a 332-first water outlet, a 34-high-temperature sealing strip, a 35-base, a 351-second water inlet, a 352-second water outlet, a 36-blocking device, a 361-upper baffle plate, a 362-upper regulating mechanism, a 363-lower baffle plate, a 364-lower regulating mechanism, a 37-flange seat, a 38-rectangular gas blowing pipe, a 4-traction winding machine, a 5-electrode port, a 51-electrode, a 6-bracket, a 7-vacuum pump, an 8-reactive compensation device and a 9-intermediate frequency power supply.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present invention.
Referring to fig. 1 to 16, fig. 1 is a schematic structural diagram of a continuous graphitizing furnace according to the present invention; FIG. 2 is a top view of FIG. 1; FIG. 3 is a schematic view in the direction A-A of FIG. 1; FIG. 4 is a schematic view showing the structure of the graphite crucible of FIG. 1; FIG. 5 is a schematic diagram of the flow of gases in a continuous graphitizing furnace according to the present invention; FIG. 6 is a schematic view of a gas seal device according to the present invention; FIG. 7 is a schematic diagram of the flow of gas in a gas seal provided by the present invention; FIG. 8 is a schematic view of the gas flow of the gas inlet pipe in the chamber of the gas seal device provided by the invention; FIG. 9 is a schematic view of the water-cooled interlayer of the cover plate and base of FIG. 6; FIG. 10 is a schematic view of the occluding device of FIG. 6; FIG. 11 is a front view of section I of FIG. 5; FIG. 12 is a top view of section I of FIG. 5; FIG. 13 is a front view of a rectangular insufflation tube provided by the present invention; FIG. 14 is a top view of a rectangular insufflation tube provided by the present invention; FIG. 15 is a side view of a rectangular insufflation tube provided by the present invention; fig. 16 is a schematic diagram of a graphite production line according to the present invention.
The continuous graphitizing furnace provided by the invention, as shown in fig. 1 to 4, comprises: a furnace body 1 for carbon fiber reaction to generate graphite; furnace covers 2 connected with two ends of the furnace body 1; the traction winding machine 4 is arranged at the outer end of the furnace cover 2 and is used for traction and driving carbon fibers into the furnace body 1; wherein, be equipped with in the furnace body 1: a graphite crucible 11 for reacting carbon fibers to form graphite; a heat-retaining portion connected to the graphite crucible 11 for preventing heat dissipation in the graphite crucible 11; the heat preservation portion includes: two insulating doors 111 respectively arranged at the inlet and outlet of the graphite crucible 11 and an insulating layer arranged on the outer side wall surface of the graphite crucible 11. Specifically, because the heat resistance of the hard carbon felt is inferior to that of graphite, in order to avoid burning out the thermal insulation door 111 at high temperature in the graphite crucible 11, limiting plates made of graphite are arranged at the inlet and outlet of the graphite crucible 11, through holes for carbon fibers to enter and for graphite products to output are arranged between the two limiting plates, and the two limiting plates are fixed at the inlet and outlet of the graphite crucible 11 through graphite bolts, so that the thermal insulation door 111 is prevented from being in direct contact with a reaction cavity in the graphite crucible 11, and the service life of the thermal insulation door 111 is prolonged. In the process that carbon fibers continuously enter and exit the graphite crucible 11, the heat-insulating door 111 can block most of heat from escaping from the inlet and outlet of the graphite crucible 11, so that electric energy for heating the graphite crucible 11 can be saved, in addition, as the heat dissipation capacity of the graphite crucible 11 is reduced, the temperature change gradient in the graphite crucible 11 is correspondingly reduced, and even if the temperature distribution in the graphite crucible 11 is uniform, the quality of graphite products is improved.
It should be noted that, the thermal insulation door 111 may be made of a hard carbon felt, or may be made of a hard carbon felt and a soft carbon felt, where the hard carbon felt is partially close to the graphite crucible 11, and the soft carbon felt is relatively far away from the graphite crucible 11, that is, the soft carbon felt of the thermal insulation door 111 is partially located outside the hard carbon felt; as shown in fig. 3, the heat insulating layer includes: a hard carbon felt heat-insulating layer 12 wrapping the outside of the graphite crucible 11 to avoid, and a soft carbon felt heat-insulating layer 13 wrapping the hard carbon felt heat-insulating layer 12, that is, the graphite crucible 11 is positioned at the inner side of the hard carbon felt heat-insulating layer 12, the hard carbon felt heat-insulating layer 12 is positioned at the inner side of the soft carbon felt heat-insulating layer 13, and the heat in the graphite crucible 11 is hardly conducted outwards through the outer side wall surfaces of the hard carbon felt heat-insulating layer 12 and the soft carbon felt heat-insulating layer 13; as shown in fig. 1, in order to facilitate installation of the insulating doors 111, the length of the insulating layer should be at least equal to the sum of the lengths of the graphite crucible 11 and the lengths of the two insulating doors 111, that is, the insulating doors 111 are fixed by extending the hard carbon felt insulating layer 12 towards the two ends of the graphite crucible 11 and beyond the portions of the graphite crucible 11, so that the two insulating doors 111 are respectively inserted into the space formed by the two ends of the hard carbon felt insulating layer 12 beyond the graphite crucible 11, and the positions of the insulating doors 111 are fixed by the limiting plates at the inlet and outlet of the graphite crucible 11; the furnace body 1 is also internally provided with: the insulating layer 14 is arranged on the outer side surface of the heat insulation layer, and the induction coil 15 is arranged on the outer side surface of the insulating layer 14 and used for heating the interior of the graphite crucible 11, wherein the insulating layer 14 is preferably a double-layer corundum insulating layer; the induction coil 15 is preferably a coffin-shaped induction coil with publication number CN10827050a, and is not described in detail herein.
Considering that a graphite product with a longer length needs to be obtained, only one graphite crucible 11 is arranged in the furnace body 1, so that a plurality of graphite crucibles connected end to end can be arranged in the furnace body 1, and the discharge port of the last graphite crucible is connected with the feed port of the next graphite crucible through a primary-secondary groove, so that carbon fibers react to form the graphite product with the required length.
Since the temperature in the furnace body 1 is high, particularly, the interior of the graphite crucible 11 and the environment in the vicinity thereof, if the air containing oxygen enters the furnace body 1, the carbon products such as the graphite crucible 11, the carbon fiber, the insulating door 111, the insulating layer and the like in the furnace body 1 are oxidized, and thus, the components in the furnace body 1 are damaged, and the quality of the graphite products is lowered. In order to prevent air from entering the furnace body 1, as shown in fig. 1 and 2, the continuous graphitizing furnace further comprises two gas sealing devices 3 which are respectively connected with the two furnace covers 2 and used for preventing air from entering the furnace body 1, and a bracket 6 which is respectively connected with the two gas sealing devices 3 and used for supporting the gas sealing devices 3. Specifically, as shown in fig. 6, the gas seal device 3 has a flange seat 37, and the flange seat 37 is used for being connected with a flange seat at a feed and discharge port of the furnace cover 2 and sealed by a gasket.
It should be noted that, the inlet and outlet of the furnace cover 2 herein specifically refers to a feed inlet of one furnace cover 2 arranged in the feed direction and a discharge outlet of the other furnace cover 2 arranged in the discharge direction in the two furnace covers 2.
As shown in fig. 5 to 8, the gas seal device 3 further includes: a channel for transporting carbon fibers; a gas distributor 31 provided in the holder 6 for the entry of a shielding gas; and an outlet pipe 32 connected to the gas distributor 31 for blowing a shielding gas into the passage. Specifically, a channel is arranged in the base 35 of the gas sealing device 3, namely, the base 35 is in a box shape with one open side, the channel is used for communicating the outside with the furnace body 1 so that carbon fibers can enter the furnace body 1 from the outside through the channel and can be conveyed to the outside through the other channel, the cover plate 33 is connected with the base 35 through bolts, namely, the cover plate 33 covers the open side of the base 35 and fixes the position of the gas outlet pipe 32, and in order to achieve the sealing effect, a high-temperature sealing strip 34 is arranged between the cover plate 33 and the base 35 for sealing so as to facilitate maintenance and cleaning of the gas sealing device 3; the base 35 is internally provided with a plurality of chambers and correspondingly divides the channel into a plurality of parts, openings are arranged between any two adjacent chambers to communicate the space of the two chambers, the openings of all the chambers form channels for conveying carbon fibers, the upper side and the lower side of each chamber are respectively provided with an air outlet pipe 32, wherein the air outlet pipes 32 are preferably U-shaped air outlet pipes, namely, two ports of the air outlet pipes 32 penetrate out of the chambers and are connected with the air distributor 31, the parts positioned in the chambers are provided with a plurality of air outlets, wherein the positions of the air outlets face different directions to ensure that no gas dead zone exists in each chamber, namely, the whole gas sealing device 3 is only filled with protective gas and does not contain other gases; the gas dead zone refers to a place where the shielding gas does not flow.
Preferably, in the gas sealing device 3, along the direction that the channel of the gas sealing device 3 is far away from the flange seat 37, the air pressure in each cavity is sequentially reduced so as to facilitate the blowing of the protective gas to the outside so as to prevent air from entering the furnace body 1 along the material inlet and outlet openings of the gas sealing device 3, wherein the air pressure in each cavity is adjusted by the air pressure of the air blown out by the air outlet pipe 32 in each cavity, namely, the air pressure in each cavity is adjusted by adjusting the air pressure of each air outlet pipe 32; the outlet pipe 32 closest to the furnace body 1 mainly blows the shielding gas into the chamber outside along the channel, and also blows the shielding gas into the furnace body 1. Preferably, the air pressure in the chamber at the feed and discharge port of the gas seal device 3 is 20Pa-100Pa greater than the air pressure of the local environment.
It should be noted that, for convenience of description, the inlet and outlet of the gas seal device 3 is understood herein to mean one inlet of the gas seal device 3 disposed in the inlet direction and the other outlet of the gas seal device 3 disposed in the outlet direction of the two gas seal devices 3.
As shown in fig. 6, the chambers in the gas seal device 3 are preferably provided with five, that is, ten outlet pipes 32 are preferably provided to prevent air from entering the furnace body 1 along the passage in the gas seal device 3. It should be noted that the above description of five and ten specific values is merely an example, and how the number of chambers and the number of air outlet pipes 32 should be set should be determined according to practical situations, specifically, the more the number of chambers is, the more the number of air outlet pipes 32 is, the better the sealing effect of the gas sealing device 3 is, and accordingly, the higher the cost of the gas sealing device 3 is, and the number of chambers and the number of air outlet pipes 32 should be determined in consideration of the sealing performance and the cost of the gas sealing device 3.
In order to avoid the too high temperature of the base 35, a first water cooling interlayer is arranged in the base 35 to cool the base 35 by circulating water. Specifically, as shown in fig. 9, the outer end of the base 35 is provided with a second water inlet 351 and a second water outlet 352 for circulating water to flow in the first water-cooling interlayer in the base 35, so as to achieve the purpose of cooling the base 35, and further facilitate maintenance work on the gas sealing device 3. The "outer end of the base 35" is understood to be the feed/discharge opening of the gas seal device 3.
Preferably, the second water inlet 351 is disposed at the bottom of the base 35, and the second water outlet 352 is disposed at the top of the base 35, i.e. the circulating water is supplied from bottom to top, so as to avoid the reduction of the cooling effect caused by the generation of bubbles in the water-cooling interlayer.
Similarly, in order to avoid the excessive temperature of the cover plate 33, a second water cooling interlayer is disposed in the cover plate 33 for cooling the cover plate 33 by the circulating water. Specifically, as shown in fig. 9, the cover plate 33 is provided with a first water inlet 331 and a first water outlet 332 for circulating water to flow in the second water-cooling interlayer in the cover plate 33, so as to achieve the purpose of cooling the cover plate 33, and further facilitate maintenance work on the gas sealing device 3. Therefore, the whole gas seal device 3 can be cooled by providing the first water-cooling interlayer in the base 35 and the second water-cooling interlayer in the cover plate 33, thereby facilitating the rapid disassembly and maintenance work of the gas seal device 3.
It will be appreciated that, besides being able to reduce the overall temperature of the gas seal device 3, the water-cooled interlayer in the cover plate 33 and the water-cooled interlayer in the base 35 can also cool the carbon fibers and the graphite products in the gas seal device 3, so as to avoid the carbon fibers and the graphite products from being too high in temperature to combine with oxygen and react, especially when the high-temperature graphite products pass through the discharge port of the gas seal device 3 and are exposed to the external environment, thereby ensuring the quality of the graphite products.
In addition, in order to avoid repeated arrangement of the water circulation system, the second water outlet 352 is preferably connected to the first water inlet 331, so that one gas sealing device 3 is provided with only one water circulation system. Of course, the second water inlet 351 may be connected to the first water outlet 332, so that only one water circulation system may be provided for one gas sealing device 3.
As shown in fig. 10, the outer end of the gas seal device 3 is further provided with a blocking device 36 for blocking the passage port. Specifically, the plugging device 36 includes: two baffles are arranged up and down, and an adjusting mechanism for controlling the distance between the two baffles, namely an upper adjusting mechanism 362 adjusts the position of the upper baffle 361, and a lower adjusting mechanism 364 adjusts the position of the lower baffle 363. When it is necessary to observe the inside of the furnace body 1, the upper regulating mechanism 362 and the lower regulating mechanism 364 are controlled so that the distance between the upper barrier 361 and the lower barrier 363 is increased, so that the inside of the furnace body 1 is observed by human eyes; in the process of conveying carbon fibers into the furnace body 1 and conveying graphite products outwards from the furnace body 1, the upper regulating mechanism 362 and the lower regulating mechanism 364 are controlled to respectively regulate the positions of the upper baffle 361 and the lower baffle 363, so that the distance between the upper baffle 361 and the lower baffle 363 is as small as possible on the basis of meeting the requirement of not scraping the carbon fibers and the graphite products, thereby avoiding external air from entering the furnace body 1 along the gas sealing device 3 and saving the consumption of protective gas.
When graphitizing reaction is performed in the furnace body 1, the distance between the upper baffle 361 and the lower baffle 363 is reduced as much as possible, so that on one hand, outside air can be prevented from entering the furnace body 1 along the gas sealing device 3, and further, the consumption of shielding gas is reduced, and on the other hand, the heat dissipated from the furnace body 1 to the outside can be reduced, further, the heat preservation effect of the furnace body 1 is improved, and accordingly, the electricity consumption of the induction coil 15 for heating the graphite crucible 11 is saved.
When the furnace body 1 is not subjected to graphitization reaction, since the upper baffle 361 and the lower baffle 363 cannot block the port of the gas seal device 3, a large amount of shielding gas is consumed to avoid the outside air from entering the furnace body 1, and in order to reduce the consumption of the shielding gas, the blocking device 36 further comprises: a sealing baffle with a sealing ring. Specifically, when the continuous graphitizing furnace does not produce graphite, for example, when the temperature in the furnace body 1 is raised from room temperature to graphitizing production temperature, or when shutdown is needed, the upper baffle 361 and the lower baffle 363 are removed, and the sealing baffles are fixed at the positions of the upper baffle 361 and the lower baffle 363, so that the sealing baffles block the feed inlet and the discharge outlet of the gas sealing device 3, and the side wall of the feed inlet and the discharge outlet of the gas sealing device 3 is attached through the sealing ring, so that the feed inlet and the discharge outlet of the gas sealing device 3 are sealed.
It should be noted that, when graphite is not produced, a small amount of shielding gas is still required to be filled into the furnace body 1, but the gas sealing devices 3 at both ends of the furnace body 1 are blocked by the sealing baffles, so in order to avoid the pressure in the furnace body 1 being too high, it is preferable to provide an air outlet valve at the blocking device 36 of the gas sealing device 3 at the discharge end of the furnace body 1, so that the shielding gas is discharged from the air outlet valve, and the pressure in the furnace body 1 is ensured to be stable. In addition, before the furnace body 1 is started (i.e. heated), the port of the gas sealing device 3 needs to be plugged through the sealing baffle, and the air outlet valve is closed, so that external air cannot enter the furnace body 1 along the gas sealing device 3, and further the furnace body 1 is vacuumized, so that no oxygen exists in the furnace body 1 during carbon fiber processing.
It can be seen that by the arrangement of the sealing baffle plate and the air outlet valve, the continuous graphitization furnace can avoid excessively consuming the protective gas for ensuring the tightness of the gas sealing device 3 when the continuous graphitization furnace is stopped or just started and the like and does not produce graphite.
In order to avoid that sharp parts (namely edges and corners) of the side wall surfaces of the upper adjusting mechanism 362 and the lower adjusting mechanism 364, which are close to the carbon fibers, are scraped to the carbon fibers, arc-shaped chamfers are arranged at the edges and corners of the upper adjusting mechanism 362 and the lower adjusting mechanism 364 so as to avoid that the surfaces of the carbon fibers are worn, and further ensure that the shapes of the graphite products are intact.
As shown in fig. 5 and 11 to 15, the present continuous graphitizing furnace further comprises: a rectangular gas blowing pipe 38 provided inside the furnace cover 2 for blowing a shielding gas into the channel and the furnace body 1; wherein the inlet of the rectangular gas-blowing pipe 38 passes through the furnace cover 2 and is connected to the gas distributor 31. Specifically, in order to further ensure that the outside air does not enter the furnace body 1, rectangular air blowing pipes 38 are arranged on the inner sides of the furnace covers 2 at the two ends of the furnace body 1, the rectangular air blowing pipes 38 are used for air intake through the air distributor 31, and protective air is blown into the furnace body 1 on one side; on the other hand, protective gas is blown into the channel of the gas sealing device 3 to be used as the final guarantee, so that the outside air cannot enter the furnace body 1.
It should be noted that, the pressure of the shielding gas blown out by the rectangular gas blowing pipe 38 should be greater than the pressure in the chamber closest to the furnace cover 2 in the gas sealing device 3, so as to avoid the reverse flow of the gas into the furnace body 1, so as to ensure the anaerobic environment in the furnace body 1.
In order to control the amount of the shielding gas blown into the furnace body 1 by the rectangular gas blowing pipe 38 so as to avoid waste caused by excessive blowing of the shielding gas into the furnace body 1 or avoid the shielding gas from being excessively blown into the furnace body 1 to play a role in protection, the air inlet of the rectangular gas blowing pipe 38 is provided with: a valve for adjusting the amount of shielding gas entering the rectangular gas-blowing pipe 38; and a gas flow meter to detect the amount of shielding gas entering the rectangular blowpipe 38. Specifically, a valve and a gas flowmeter are sequentially arranged between the rectangular gas blowing pipe 38 and the gas distributor 31 along the gas flow direction, the gas flowmeter measures and displays the amount of the protective gas blown into the furnace body 1 by the rectangular gas blowing pipe 38 in real time, if the amount of the protective gas blown in is small, the valve is opened, and the blowing amount of the protective gas is increased so as to ensure the quality of graphite products; if more shielding gas is blown in, the valve is closed, so that the blowing amount of the shielding gas is reduced, the consumption of the shielding gas is reduced, the waste of the shielding gas is avoided, and the manufacturing cost of the graphite product is reduced.
As shown in fig. 1, the furnace cover 2 of the feeding end is provided with a temperature measuring port 21, and is used for setting an infrared thermometer at 1000-3000 ℃ to carry out real-time closed-loop control and monitoring on the temperature in the graphite crucible 11; in addition, a tungsten thermocouple is further arranged near the temperature measuring port 21 so as to monitor the temperature in the furnace body 1 in real time, further judge the damage degree and the heat insulation performance of the heat insulation layer, if the temperature in the furnace body 1 is too high, the heat insulation layer is damaged, and the heat loss in the graphite crucible 11 is large so as to remind a worker of overhauling the heat insulation layer.
The other parts in the furnace body 1 may refer to a horizontal graphitizing furnace with publication number CN206126857U, and the description of the other parts in the furnace body 1 in the prior art will not be repeated here.
It should be further noted that, in the drawings of the specification, arrows in fig. 1 represent the conveying direction of the carbon fibers and the graphite product; arrows in fig. 5, 7, 8, 11, and 12 represent the direction in which the shielding gas flows.
The invention provides a graphite production line, which comprises a vacuum pump 7, a reactive compensation device 8 and a continuous graphitizing furnace connected with the vacuum pump 7 and the reactive compensation device 8 as shown in fig. 3 and 16. Specifically, the vacuum pump 7 is connected with a vacuum port 16 on the furnace body 1, and the vacuum pump 7 is used for pumping out gas in the furnace body 1 before heating and processing carbon fiber in the furnace body 1, wherein the pumped gas comprises oxygen, so that no oxygen exists in the furnace body 1 in the process of generating a graphite product, and further, the reaction of the graphite crucible 11, the carbon fiber, the graphite product and other components with oxygen under the high temperature condition is avoided; the reactive power compensation device 8 is connected with an electrode 51, wherein the electrode 51 is arranged at an electrode port 5 on the furnace body 1; the reactive compensation device 8 is also connected with an intermediate frequency power supply 9 for supplying power to an induction coil 15 in the continuous graphitizing furnace. The vacuum pump 7, the reactive compensation device 8, the intermediate frequency power supply 9 and other parts of the graphite production line can be referred to the prior art and are not developed here.
The graphite production line and the continuous graphitizing furnace provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (5)
1. A continuous graphitizing furnace, comprising:
A furnace body (1) for carbon fiber reaction to generate graphite;
Furnace covers (2) connected with two ends of the furnace body (1);
The traction winding machine (4) is arranged at the outer end of the furnace cover (2) and is used for traction and driving carbon fibers into the furnace body (1);
Wherein, be equipped with in furnace body (1): a graphite crucible (11) for reacting carbon fibers to form graphite; two heat preservation doors (111) which are respectively arranged at the inlet and the outlet of the graphite crucible (11) and used for avoiding heat dissipation in the graphite crucible (11), wherein limiting plates are arranged at the inlet and the outlet of the graphite crucible (11), and through holes are formed in the middle of the two limiting plates;
Two gas sealing devices (3) which are respectively connected with the two furnace covers (2) and used for preventing air from entering the furnace body (1), and brackets (6) which are respectively connected with the two gas sealing devices (3) and used for supporting the gas sealing devices (3);
The base (35) of the gas sealing device (3) is provided with a first water cooling interlayer for cooling the circulating water, and the outer end of the base (35) is provided with a second water inlet (351) and a second water outlet (352); the cover plate (33) of the gas sealing device (3) is provided with a second water cooling interlayer for cooling the circulating water, the cover plate (33) is provided with a first water inlet (331) and a first water outlet (332), and the second water outlet (352) is connected with the first water inlet (331);
A plurality of chambers are arranged in the base (35), openings are arranged between any two adjacent chambers to communicate the space of the two chambers, the openings of all the chambers form channels for conveying carbon fibers, an air outlet pipe (32) is arranged on the upper side and the lower side of each chamber, the air outlet pipe (32) is a U-shaped air outlet pipe, two ports of the air outlet pipe (32) penetrate out of the chambers and are connected with the air distributor (31), and a plurality of air outlets are formed in the portions located in the chambers.
2. Continuous graphitizing furnace according to claim 1, characterized in that the outer end of the gas sealing means (3) is further provided with plugging means (36) for plugging the channel ports.
3. The continuous graphitizing furnace according to claim 2, further comprising a rectangular gas blowing pipe (38) provided inside the furnace cover (2) for blowing a shielding gas into the channel and the furnace body (1); wherein the air inlet of the rectangular air blowing pipe (38) penetrates through the furnace cover (2) and is connected with the air distributor (31).
4. A continuous graphitizing furnace according to claim 3, characterized in that the rectangular gas blowing pipe (38) is provided with at its inlet: a valve for adjusting the amount of shielding gas entering the rectangular blowpipe (38); and a gas flow meter to detect the amount of shielding gas entering the rectangular blowpipe (38).
5. A graphite production line comprising a vacuum pump (7) and a reactive compensation device (8), characterized in that it further comprises a continuous graphitizing furnace according to any one of claims 1 to 4, connected to the vacuum pump (7) and to the reactive compensation device (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910117111.3A CN109553097B (en) | 2019-02-15 | Graphite production line and continuous graphitizing furnace thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910117111.3A CN109553097B (en) | 2019-02-15 | Graphite production line and continuous graphitizing furnace thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109553097A CN109553097A (en) | 2019-04-02 |
| CN109553097B true CN109553097B (en) | 2024-06-07 |
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