CN115823596A - Carbon fiber carbonization system - Google Patents

Abstract

The invention discloses a carbon fiber carbonization system, which comprises a low-temperature carbonization furnace; a waste discharge pipeline; the low-temperature carbonization furnace is communicated with the furnace body and is used for discharging waste gas generated in the low-temperature carbonization furnace; each waste discharge pipeline is respectively provided with a heat tracing module, each heat tracing module is communicated with a hot air module, and the hot air module respectively heats waste gas in the corresponding waste discharge pipeline through each heat tracing module; the hot air module comprises an incinerator, the incinerator is communicated with the heat tracing module, and high-temperature clean gas generated after incineration is conveyed to the heat tracing module to heat waste gas in the waste discharge pipeline. The invention has the following beneficial effects: the waste discharge pipeline is heated by hot air, so that the hot air can heat the plurality of heat tracing modules through the pipeline, and the energy waste is reduced; and the cleaning gas with higher temperature is used for heating the waste discharge pipeline, so that the heat of the cleaning gas is recycled, the energy recycling is realized, the requirement on electric energy is reduced, and the production cost is reduced.

Description

Carbon fiber carbonization system

Technical Field

The invention belongs to the field of carbon fiber carbonization production, and particularly relates to a carbon fiber carbonization system.

Background

Polyacrylonitrile (PAN) -based carbon fibers are inorganic fibrous materials with carbon elements of more than 90 percent by mass; the Polyacrylonitrile (PAN) based carbon fiber protofilament is subjected to four process flows of oxidation, low-temperature carbonization, high-temperature carbonization, sizing and drying, H and 0 contained in the Polyacrylonitrile (PAN) based carbon fiber protofilament are removed in the form of organic matters, the orientation of the internal fiber is changed, and the Polyacrylonitrile (PAN) based carbon fiber is finally formed; the Polyacrylonitrile (PAN) based carbon fiber has a series of outstanding mechanical properties and excellent comprehensive characteristics such as moderate bulk density, extremely high specific strength and specific modulus, good deep processing performance, good fatigue resistance, good ablation resistance, excellent vibration damping performance, good product size stability, good electric and thermal conductivity and the like; the 3K small tow carbon fiber has the tensile modulus of 260-310 GPa and the tensile strength of 5.0-7.0 Gpa, is a typical high-performance high-strength medium model carbon fiber, and is an irreplaceable core strategic material in the military field of aerospace, weapons and the like; in the industrial field, the material is a key base material in the fields of high-end equipment manufacturing and upgrading, wind power blade manufacturing, sports goods and the like, and has wide application. In recent years, the field of downstream carbon fiber composite materials is in a blowout type growth trend in China, and the demand of carbon fibers is rapidly increased.

In the production process, the carbonization line generates volatile gas after chemical reaction in the low-temperature carbonization furnace, most of the volatile gas belongs to waste gas, the volatile gas is deposited in a hearth to form tar when the waste gas is not discharged in time, the filament bundle is in contact with the tar and is scratched when passing through the hearth, and the scratched filament bundle is easy to have large-area filament damage or even burning-out at high temperature of about 700 ℃, so that the product quality and the economic benefit of a manufacturer are seriously influenced; moreover, when the waste gas is discharged through the pipeline, because the tar content is relatively high, the production capacity is gradually increased, and the yield of the waste gas is correspondingly increased, and in the process of circulating a large amount of waste gas in the pipeline, due to the influence of factors such as the gradual reduction of the flow rate and the temperature of the waste gas, the tar in the waste gas is easily deposited in the pipeline to block the waste discharge pipeline, so that the waste gas is prevented from being discharged, and a large amount of waste gas deposited in a hearth is converted into tar, thereby causing the abnormal condition of the process; generally, in order to avoid the above situations, manufacturers usually adopt an electric auxiliary heat device placed outside the waste discharge pipeline to heat up waste gas in the waste discharge pipeline, and each waste discharge pipeline needs to be provided with electric auxiliary heat respectively, and because a certain distance exists between the waste discharge pipelines, the electric auxiliary heat cannot be interconnected, and the generated heat cannot be mutually transferred, so that the power consumption of the factory is greatly increased, a large amount of resource waste is caused, the production cost of the manufacturers is increased, and the economic benefit is reduced; in addition, the carbonization line production line usually comprises an incinerator for treating the tail gas of the low-temperature carbonization furnace, the tail gas is converted into nontoxic and harmless clean gas with high temperature which can be directly discharged into the atmosphere after being combusted in the waste gas incinerator, the clean gas is usually directly discharged into the atmosphere, the heat energy of the clean gas is not effectively recycled, and a large amount of heat energy is wasted.

The present invention has been made in view of this situation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a carbon fiber carbonization system, which heats a plurality of waste discharge pipelines simultaneously through a hot air module and a hot air heating mode of heating the waste discharge pipelines by hot air so as to solve the problem of overhigh energy consumption caused by the fact that energy cannot be mutually utilized when the waste discharge pipelines are respectively provided with the heating modules; and clean gas generated by the existing incinerator is heated for a waste discharge pipeline, heat is fully recycled, and the problem of waste of heat energy of the clean gas is solved.

In order to solve the technical problems, the invention adopts the technical scheme that: a carbon fiber carbonization system comprises a low-temperature carbonization furnace; a waste discharge pipeline; the low-temperature carbonization furnace is communicated with the furnace body and is used for discharging waste gas generated in the low-temperature carbonization furnace; and each waste discharge pipeline is respectively provided with a heat tracing module, each heat tracing module is communicated with a hot air module, and the hot air module respectively heats waste gas in the corresponding waste discharge pipeline through each heat tracing module.

Further, the waste discharge pipeline is provided with an air outlet for discharging waste gas; the hot air module comprises an incinerator, is communicated with an air outlet of the waste discharge pipeline and is used for incinerating waste gas discharged by the waste discharge pipeline; the incinerator is communicated with the heat tracing module and used for conveying high-temperature clean gas generated after incineration to the heat tracing module to heat waste gas in the waste discharge pipeline.

Further, the heat exchanger is also provided with an air inlet for introducing fresh air; the heat exchanger is communicated with the heat tracing module and is used for exchanging heat between the clean gas flowing through the heat tracing module and fresh air; and/or the heat exchanger is communicated with the incinerator and used for exchanging heat between clean gas generated by the incinerator and fresh air.

Furthermore, a branch pipeline communicated with the heat exchanger is arranged on a pipeline communicated with the heat tracing module and the incinerator to divide the clean gas discharged from the incinerator.

Further, the drying device is used for drying the carbon fibers; the heat exchanger is communicated with the drying equipment and is used for introducing fresh air subjected to heat exchange into the drying equipment.

Furthermore, the waste discharge pipeline at least comprises a first waste discharge pipeline and a second waste discharge pipeline, and the low-temperature carbonization furnace is respectively communicated with the incinerator through the first waste discharge pipeline and/or the second waste discharge pipeline; the first waste discharge pipeline and the second waste discharge pipeline are respectively provided with a first heat tracing module and a second heat tracing module.

Furthermore, the hot air main pipe is communicated with the air inlet end of the first heat tracing module, the air outlet end of the first heat tracing module is communicated with the air inlet end of the second heat tracing module, and hot air in the hot air main pipe sequentially passes through the first heat tracing module and the second heat tracing module.

Further, the device also comprises a high-temperature carbonization furnace; high-temperature waste gas generated by the high-temperature carbonization furnace is communicated with the second waste discharge pipeline through a pipeline, so that the high-temperature waste gas can mix and heat the waste gas in the second waste discharge pipeline.

Furthermore, each heat tracing module is a plate heat exchanger, and each heat tracing module wraps the periphery of the corresponding waste discharge pipeline.

Further, burn and be provided with the furnace that is used for combustion exhaust in the burning furnace, be provided with the governing valve that is used for carrying out the examination firearm that detects and control combustible gas input furnace to the intensity of a fire in the furnace, through examining the aperture of firearm control governing valve, adjust the intensity of a fire in the furnace and to accompanying hot module output clean gaseous amount of wind and temperature.

After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: by adopting a mode of heating the waste discharge pipeline by hot air, the hot air can heat a plurality of heat tracing modules through the pipeline, thereby reducing energy waste; the clean gas with higher temperature is used for heating the waste discharge pipeline to recycle the heat of the clean gas, so that the energy is recycled, the requirement on electric energy or heat energy generated by combustion is reduced, and the production cost is reduced; and the clean gas output by the heat tracing module provides heat for the drying equipment through the heat exchanger, so that the drying equipment is not used for heating fresh air in an electric heating mode, and the energy consumption of the fiber carbonization system in the production process is further reduced.

Meanwhile, the invention has simple structure and obvious effect and is suitable for popularization and use.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic process diagram of a carbon fiber carbonization system according to an embodiment of the present invention;

FIG. 2 is a schematic external view of a waste line according to an embodiment of the present invention;

FIG. 3 is a schematic view of the exhaust gas flowing through each exhaust pipe according to an embodiment of the present invention;

FIG. 4 is a schematic view illustrating a flow of exhaust gas through each exhaust pipe according to an embodiment of the present invention;

FIG. 5 is a schematic view illustrating a flow of exhaust gas through an exhaust manifold according to an embodiment of the present invention.

In the figure: 1. a low-temperature carbonization furnace; 2. a high-temperature carbonization furnace; 3. an incinerator; 4. a waste discharge pipeline; 5. a heat tracing module; 6. a heat exchanger; 7. a hot air module; 8. a drying device;

301. a hearth; 302. detecting a fire device; 303. adjusting a valve;

401. a first waste discharge line; 402. a second waste discharge pipeline; 403. an exhaust duct; 4031. a horizontal exhaust pipe; 4032. a vertical exhaust pipe; 404. a waste pipe; 4041. an air inlet pipe; 4042. a confluence pipe; 4043. an air outlet pipe; 405. a main waste discharge pipeline; 4051. a main air inlet pipe; 4052. a main current collecting tube; 4053. a main air outlet pipe; 406. a spare waste discharge pipeline; 4061. a standby air inlet pipe; 4062. a standby confluence pipe; 4063. a spare air outlet pipe; 407. a waste discharge main pipe; 4071. a communicating pipe;

501. a first heat tracing module; 502. a second heat tracing module;

601. a fresh air fan; 602. a waste discharge fan.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it for those skilled in the art by reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1, a carbon fiber carbonizing system includes a low temperature carbonization furnace 1; a waste discharge pipeline 4; is communicated with the low-temperature carbonization furnace 1 and is used for discharging waste gas generated in the low-temperature carbonization furnace 1; each waste discharge pipeline 4 is provided with a heat tracing module 5, each heat tracing module 5 is communicated with a hot air module 7, and the hot air module 7 heats waste gas in the corresponding waste discharge pipeline 4 through each heat tracing module 5.

Preferably, the hot air module 7 is provided with a direct-fired incinerator, and hot air generated by combustion is conveyed into each heat tracing module 5.

Through the arrangement, hot air is supplied to the heat tracing module 5 through the hot air module 7, and the heat tracing module 5 carries out non-contact heating on waste gas in the waste discharge pipeline 4 through the hot air, so that reaction byproducts in the low-temperature carbonization process exist in a gaseous state and are promoted to be discharged into the incinerator 3 through the waste discharge pipeline, and the phenomenon that the air resistance in the waste discharge pipeline 4 is improved and even the pipeline is blocked due to the fact that tar is separated out and attached to the pipe wall of the waste discharge pipeline 4 is avoided; more importantly, through the mode of hot-blast heating to waste discharge pipeline 4, can pass through the pipeline water conservancy diversion with hot-blast to a plurality of heat tracing module 5 in, realize heating respectively the waste gas in each waste discharge pipeline 4, reduce the energy waste.

In the embodiment of the invention, the hot air module 7 can be a separately-arranged hot air furnace, and the hot air generated by burning the raw materials such as biomass, and/or coal, and/or natural gas, and/or straw is conveyed into the heat tracing module 5 to heat the waste gas in the waste discharge pipeline 4.

In a preferred embodiment of the present invention, the exhaust line 4 has an outlet port for discharging exhaust gas; the hot air module 7 comprises an incinerator 3 which is communicated with an air outlet of the waste discharge pipeline 4 and is used for incinerating waste gas discharged by the waste discharge pipeline 4; the incinerator 3 is communicated with the heat tracing module 5, and high-temperature clean gas generated by the incinerator 3 is conveyed into the heat tracing module 5 and heats waste gas in the waste discharge pipeline 4.

It should be noted that the waste gas generated by each carbonization furnace is discharged into the incinerator 3 through the waste discharge pipeline 4, and in the incinerator 3, under the sealed condition ensured by the nitrogen gas seal, the waste gas and the natural gas input through the natural gas pipeline are subjected to combustion reaction, a large amount of heat energy is released in the combustion process, and then the waste gas is converted into the non-toxic and harmless clean gas with high temperature.

Through the setting, through the clean gas that will have higher temperature for exhaust pipe 4 heats to carry out recycle to clean gaseous heat, realized the cyclic utilization of energy, reduce the production process to the demand of electric energy or the energy of burning, reduced manufacturing cost.

In the embodiment of the invention, the heat tracing module 5 can also comprise electric auxiliary heat, and the waste gas in the waste discharge pipeline is heated by the cleaning gas and the electric auxiliary heat together; the heating of the waste gas can be accurately controlled through the electric auxiliary heat, so that the waste gas can be stably heated to a preset value through controlling the power of the electric auxiliary heat under the condition of heating the waste gas together with hot air.

In the embodiment of the invention, the heat exchanger 6 is further included, and the heat exchanger 6 is provided with an air inlet for introducing fresh air; the heat exchanger 6 is communicated with the heat tracing module 5 and is used for exchanging heat between the clean gas flowing through the heat tracing module 5 and fresh air; and/or the heat exchanger 6 is communicated with the incinerator 3 and is used for exchanging heat between the clean gas generated by the incinerator 3 and the fresh air.

Preferably, the carbon fiber carbonization system further comprises a fresh air fan 601, and the fresh air fan 601 is arranged at the front end of the air inlet of the heat exchanger 6 and used for blowing fresh air into the heat exchanger 6.

Through the setting, clean gas is behind getting into heat exchanger 6, heat exchanger 6 is blown into with external new trend to new trend fan 601, heat exchanger 6 heats external new trend through the mode of non-contact heat transfer with the heat in the clean gas, the heating new trend can regard as the air inlet of the oxidation furnace of carbon fiber carbonization system, and/or as the air inlet of the drying oven of carbon fiber carbonization system, carry out abundant recycle to the residual heat to clean gas, further promoted carbon fiber carbonization system to hot blast thermal utilization ratio, manufacturing cost is reduced.

In the embodiment of the invention, a branch pipeline communicated with the heat exchanger 6 is arranged on a pipeline communicated with the incinerator 3 and the heat tracing module 5, and is used for dividing clean gas discharged from the incinerator 3.

After the temperature of the waste gas is raised to 500 ℃, the tendency that tar in the waste gas is desublimated and attached to the pipe wall can be restrained, so that the heating of the waste gas is controlled within a certain range of more than 500 ℃, excessive temperature rise can not only cause energy waste, but also cause the temperature in the incinerator 3 to be excessively raised after the waste gas with the excessive temperature is circulated to the incinerator 3, and influence is caused on the temperature control of the incinerator 3.

By the arrangement, part of the clean gas is shunted so as to effectively control the heating effect of the waste gas and avoid overheating the waste gas in the waste discharge pipeline 4; simultaneously, clean gas that the reposition of redundant personnel was flowed out directly gets into heat exchanger 6, heats the new trend in the heat exchanger 6 to promote the heating effect of heat exchanger 6 to the new trend.

In the embodiment of the invention, the drying device 8 is also included for drying the carbon fiber; the heat exchanger 6 is communicated with the drying equipment 8 and is used for introducing fresh air subjected to heat exchange into the drying equipment 8.

Preferably, the drying apparatus 8 is a vertical drying oven.

Through the arrangement, heat is provided for the drying process of the carbon fiber carbonization system through the heat exchanger 6, so that the drying equipment 8 is omitted to heat fresh air in an electric heating mode, and the energy consumption of the carbon fiber carbonization system in the production process is reduced.

Preferably, the carbon fiber carbonization system further comprises at least one waste discharge fan 602, wherein the waste discharge fan 602 is arranged at the rear end of the heat exchanger 6, is communicated with a pipeline for conveying clean gas, and is used for pumping out the clean gas in the pipeline and discharging the clean gas into the atmosphere; so as to improve the fluidity of the cleaning gas in the pipeline and avoid the overstocking in the pipeline.

In the embodiment of the invention, the waste discharge pipeline 4 at least comprises a first waste discharge pipeline 401 and a second waste discharge pipeline 402, and the low-temperature carbonization furnace 1 is respectively communicated with the incinerator 3 through the first waste discharge pipeline 401 and/or the second waste discharge pipeline 402; the first waste discharge pipe 401 and the second waste discharge pipe 402 are provided with a first heat tracing module 501 and a second heat tracing module 502, respectively.

Through the setting, through dividing the waste gas with low temperature carbonization furnace 1 in the emission to heat respectively through the companion's of correspondence hot module 5, with the heating efficiency of promotion to waste gas, promote the thermal conversion rate to clean gas.

In the embodiment of the present invention, the main hot air pipe is communicated with the air inlet end of the first heat tracing module 501, the air outlet end of the first heat tracing module 5 is communicated with the air inlet end of the second heat tracing module 502, and the hot air in the main hot air pipe is made to sequentially pass through the first heat tracing module 5 and the second heat tracing module 502.

Through the arrangement, the arrangement of the pipelines of the carbon fiber carbonization system is simplified under the condition that the heating effect is not influenced by the arrangement of the heat tracing modules 5 which are connected in series.

In the embodiment of the invention, the high-temperature carbonization furnace 2 is also included; high-temperature waste gas generated by the high-temperature carbonization furnace 2 is communicated with the second waste discharge pipeline 402 through a pipeline, so that the high-temperature waste gas can mix and heat the waste gas in the second waste discharge pipeline 402.

Through the arrangement, after the waste gas in the first waste discharge pipeline 401 and the heat loss in the pipeline transmission are finished by heating the clean gas, the heating effect on the second waste discharge pipeline 402 may be undesirable, and by mixing the high-temperature waste gas in the high-temperature carbonization furnace 2 with the waste gas in the second pipeline, because the temperature in the high-temperature carbonization furnace 2 can reach 950 ℃ -1480 ℃, the temperature of the generated high-temperature waste gas is far higher than the temperature of the waste gas generated by the low-temperature carbonization furnace 1, the temperature of the waste gas in the second waste discharge pipeline 402 can be greatly increased under the condition that a heating device is not additionally arranged, and byproducts are prevented from being sublimated, separated out and attached to the pipe wall; meanwhile, the high-temperature waste gas of the high-temperature carbonization furnace 2 is conveyed through the second waste discharge pipeline 402, so that the pipeline arrangement mode of the carbon fiber carbonization system is simplified, the air inlet arrangement of the incinerator 3 is reduced, and the construction cost of the carbon fiber carbonization system and the construction period of equipment manufacturing are reduced.

Preferably, the high temperature exhaust gas is communicated to the second waste pipe 402 between the second heat tracing module 502 and the incinerator 3 through a pipe.

Through above-mentioned preferred setting to make waste gas heat back in second heat tracing module 502, mix with high temperature waste gas again, promoted waste gas to the endothermic efficiency of clean gas, avoid simultaneously because the higher clean gas to in the second heat tracing module 502 of temperature after waste gas mixes with high temperature waste gas carries out the reverse heating, the condition that leads to the energy waste takes place.

In the embodiment of the invention, the heat tracing module 5 is a plate heat exchanger, and the heat tracing module 5 is wrapped on the periphery of the waste discharge pipeline 4 to heat the waste discharge pipeline 4; the plate heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area and long service life; effectively improving the heat exchange efficiency and greatly reducing the occupied area of the heat tracing module 5.

In the embodiment of the present invention, a furnace 301 for burning waste gas is provided in the incinerator 3, a fire detector 302 for detecting fire and an adjusting valve 303 for controlling combustible gas input into the furnace 301 are provided in the furnace 301, and the fire detector 302 controls the opening of the adjusting valve 303 to adjust the fire in the furnace 301 and output the air volume and temperature of the clean gas to the heat tracing module 5.

It should be noted that the combustible gas includes natural gas, water gas and other common combustible gases, and the combustible gas is introduced into the furnace 301, and the introduced gas amount is controlled, so as to control the fire behavior of the flame combustion condition in the furnace 301, so as to fully combust the waste gas under a reasonable fire behavior, and ensure that the output clean gas is nontoxic and harmless gas; and the size of the fire represents the combustion reaction degree in the hearth 301, when the gas is violently combusted, the quantity and the temperature of clean gas generated in the hearth 301 in unit time can be increased, and the heating efficiency of the heat tracing module 5 can be regulated and controlled by controlling the fire.

Through the arrangement, when the temperature of the circulating waste gas in the waste discharge pipeline 4 is detected to be lower, the fire can be properly promoted to promote the effect of heating the waste gas; on the contrary, when the fire is too high, the fire can be properly reduced, and the energy waste is avoided.

In the embodiment of the invention, the natural gas pipeline transmits natural gas into the incinerator 3 to perform combustion reaction with the waste gas of the carbonization furnace; the natural gas pipeline is provided with a flowmeter which can monitor the real-time flow of the natural gas in the natural gas pipeline; the natural gas pipeline is provided with a pressure gauge for measuring the pressure of the natural gas in the pipeline, and the pressure regulating valve is an electromagnetic valve and can control the flow of the natural gas in the pipeline in real time according to pressure data output by the pressure gauge; before the natural gas is transmitted into the incinerator 3 in a pipeline, the valve bank passed by the natural gas finally is an ignition valve bank; the ignition valve bank adopts electromagnetic control and plays a role in igniting and supporting combustion for natural gas; the fire detector 302 is arranged at the fire hole of the hearth 301 of the incinerator 3, judges whether the fire in the hearth 3 is too large and the temperature is too high according to the fire detection signal, and transmits a signal to the ignition valve group to extinguish the fire if the abnormal condition of the fire in the hearth 301 is too large or deflagration occurs, so that the incinerator 3 stops working; the incinerator 3 also comprises an air seal area, the air seal area is communicated with a nitrogen pipeline, and the nitrogen pipeline conveys nitrogen to the air seal area of the incinerator 3, so that the effect of ensuring the air tightness of the hearth 301 is achieved, and oxygen is prevented from entering the incinerator 3 to cause deflagration; the hearth 301 is also communicated with a combustion-supporting fan, and the combustion-supporting fan blows fresh air into the hearth 301 for supporting combustion.

In the embodiment of the present invention, the gas flow process in the preferred embodiment of the present invention is:

waste gas generated in the low-temperature carbonization furnace 1 is discharged out of the low-temperature carbonization path through the first waste discharge pipeline or the second waste discharge pipeline 402, is heated and heated through the corresponding heat tracing module 5, and is conveyed into the incinerator 3 for incineration and purification; meanwhile, the high-temperature exhaust gas generated from the high-temperature carbonization furnace 2 is merged with the exhaust gas in the second exhaust line 402 through a line and is conveyed into the incinerator 3 together.

The waste gas delivered to the incinerator 3 is mixed with natural gas, and is converted into non-toxic and harmless clean gas with high temperature after being subjected to combustion reaction with fresh air blown into the hearth 301, and the clean gas is delivered out of the hearth 301.

The outgoing clean gas is divided into two parts, one part passes through the first heat tracing module 501 and the second heat tracing module 502 in sequence, heats the waste gas in the corresponding waste discharge pipeline 4, and then enters the heat exchanger 6; another part of the clean gas is then directly fed into the heat exchanger 6.

After the two parts of clean gas respectively enter the heat exchanger 6 and are mixed, the fresh air fan 601 blows external fresh air into an air inlet of the heat exchanger 6, the heat exchanger 6 heats the external fresh air through the clean gas, and the heated external fresh air is introduced into the vertical drying furnace through a pipeline to provide heat energy for the drying process; correspondingly, the clean gas with lower temperature for completing heat exchange in the heat exchanger 6 can be directly discharged into the atmosphere.

Through the above-mentioned flow, when heating the waste gas through in the exhaust pipe way 4, carried out abundant heat recovery to the clean gaseous heat of heating usefulness, when the realization is difficult for appearing the waste gas accessory substance to block up the pipeline in exhaust pipe way 4, carry out the heat recycle who fills to the gas that burns burning furnace 3 burning production.

Example 2

Embodiment 2 of the present invention is different from embodiment 1 described above in that embodiment 2 mainly describes a specific structure of a waste pipe 4 of a carbon fiber carbonizing system.

As shown in fig. 1 to 5, the embodiment of the present invention describes a waste discharge pipeline 4 of a carbon fiber carbonization system, which at least includes two sets of waste discharge pipelines 404 independent from each other, each waste discharge pipeline 404 is respectively connected to a carbonization furnace of the carbon fiber carbonization system in an on-off manner, and each waste discharge pipeline 404 is alternatively connected to each other for discharging waste gas in the carbonization furnace.

As shown in fig. 1, in the embodiment of the present invention, the carbonization furnace is a low temperature carbonization furnace 1 and/or a high temperature carbonization furnace 2; preferably, the carbonization furnace is a low temperature carbonization furnace 1.

Through the setting, through having add at least a set of exhaust pipe 404 to when the exhaust pipe 404 that uses at present takes place to block up, influence waste gas, through launching other exhaust pipe 404 immediately, guarantee that production continues steadily to go on, improved the reliability of carbonization line production.

As shown in fig. 2, in the embodiment of the present invention, the two sets of waste pipes 404 include a primary waste pipe 405 and a backup waste pipe 406, and the pipe diameter of the backup waste pipe 406 is larger than that of the primary waste pipe 405.

Through the arrangement, when the main waste discharge pipeline 405 is blocked, waste gas generated by the low-temperature carbonization furnace 1 is accumulated in the hearth of the low-temperature carbonization furnace 1 due to unsmooth gas circulation, and the diameter of the standby waste discharge pipeline 406 is properly increased to quickly discharge the waste gas accumulated in the hearth, so that tar precipitation is prevented from being attached to the hearth, and the phenomenon of filament scraping is avoided

As shown in fig. 2 and 4, each waste pipe 404 in the embodiment of the present invention includes a plurality of inlet pipes 4041; each air inlet pipe 4041 is respectively communicated with the carbonization furnace; a main air inlet pipe 4051 of the main waste discharge pipeline 405 and a standby air inlet pipe 4061 of the standby waste discharge pipeline 406 are respectively provided with a main air inlet valve and a standby air inlet valve for controlling the on-off of the pipelines; in the production process, the main air inlet valve and the standby air inlet valve are alternatively opened.

In the embodiment of the present invention, each waste discharge pipe 404 further includes a confluence pipe 4042 and an outlet pipe 4043; each air inlet pipe 4041 is vertically arranged; the bottom end of each air inlet pipe 4041 is communicated with the carbonization furnace, and the corresponding other end is respectively communicated with a horizontally arranged confluence pipe 4042; the top of each confluence tube 4042 is respectively communicated with an air outlet tube 4043; the exhaust gas from the carbonization furnace is discharged out of the exhaust gas pipeline through the inlet pipe 4041, the junction pipe 4042 and the outlet pipe 4043 in sequence.

Through the above arrangement, each air inlet pipe 4041 respectively circulates to the air outlet pipe 4043 through the confluence pipe 4042 and is discharged, a gas guide mode that the circulating waste gas of each air inlet pipe 4041 is repeatedly converged in the confluence pipe 4042 and then is guided out through the air outlet pipe 4043 is formed, so that the pressure generated by the confluence of the waste gas is dispersed at the communicated parts of each air inlet pipe 4041 and each air outlet pipe 4043, which are respectively connected with the confluence pipe 4042, the structural stability of each pipe wall of the waste discharge pipeline 404 is improved, the whole pressure resistance of the pipe wall is improved, and the service life of the pipe wall is prolonged.

Specifically, the primary inlet pipes 4051 are respectively vertically arranged, and the respective top ends thereof are communicated with the primary flow merging pipe 40424052 of the horizontally arranged primary waste discharge pipe 405, and the top of the horizontal primary flow merging pipe 40424052 is communicated with the vertically arranged primary outlet pipe 4053; the waste gas in each main air inlet pipe 4051 is exhausted through a main air outlet pipe 4053; the standby inlet pipes 4061 are respectively vertically arranged, the top ends of the standby inlet pipes 4061 are communicated with the standby merging pipe 4062 of the horizontally arranged standby waste discharge pipe 406, and the top of the horizontal standby merging pipe 4062 is communicated with a vertically arranged standby outlet pipe 4063; the exhaust gas in each backup inlet pipe 4061 is discharged through a backup outlet pipe 4063.

Preferably, each air inlet pipe 4041 is uniformly arranged below the corresponding flow merging pipe 4042, and each air outlet pipe 4043 is arranged in the middle of the corresponding flow merging pipe 4042; the waste gas which flows into the confluence pipeline 4042 is made to flow to the middle position of the confluence pipeline 4042 respectively, and forms an opposite flushing confluence at the lower end position of the air outlet pipe 4043, the air pressure at two sides of the joint of the air outlet pipe 4043 in the confluence pipeline 4042 is made to be basically the same, and the phenomenon that the gas circulation efficiency at one side with smaller air pressure is reduced due to different opposite flushing air pressures, so that tar deposition is caused to block the pipeline at the side is avoided.

As shown in fig. 2 and 5, in the embodiment of the present invention, a waste header 407 is further included; the waste discharge header 407 is disposed between the primary waste discharge pipe 405 and the standby waste discharge pipe 406, and two sides of the pipe wall are respectively provided with a communicating pipe 4071 correspondingly communicated with the primary outlet pipe 4053 and the standby outlet pipe 4063.

In the embodiment of the invention, the drift diameters of the primary outlet pipe 4053 and the standby outlet pipe 4063 are respectively equal to the drift diameters of the primary waste discharge pipeline 405 and the standby waste discharge pipeline 406.

In an embodiment of the present invention, the drift diameter of the waste discharge header pipe 407 is greater than or equal to the drift diameter of the primary waste discharge pipe 405.

Preferably, the diameter of the auxiliary waste discharge line 406 is equal to or larger than the diameter of the main waste discharge line 405, and the diameter of the auxiliary waste discharge line 406 is equal to or smaller than the diameter of the waste discharge header 407.

Through the setting, under the circumstances that guarantees waste pipe 404 and can bear the pressure that the waste gas confluence produced to the pipe wall, promoted the velocity of flow of waste gas in the pipeline, promoted the effect of waste gas to pipeline clearance, make waste gas be difficult to take place the deposit in the pipeline to when promoting spinning speed, even take place the waste gas production volume and improve, can not take place the condition of pipe blockage yet, promoted economic benefits.

In the embodiment of the invention, each communicating pipe 4071 is provided with a communicating valve for controlling the on-off of the pipeline, and the on-off of the corresponding waste discharge pipeline 404 and the waste discharge header pipe 407 is controlled by each communicating valve; in the production process, one of the communicating valves is opened; specifically, a main communicating valve is provided in a communicating pipe 4071 communicating with the main waste discharge pipe 405, and a backup communicating valve is provided in a communicating pipe 4071 communicating with the backup waste discharge pipe 406.

As shown in fig. 2 and 3, in the embodiment of the present invention, the exhaust pipes 403 are arranged on the periphery of the carbonization furnace, and each exhaust pipe 403 is respectively communicated with each waste pipe 404; each exhaust duct 403 includes a horizontal exhaust pipe 4031 and vertical exhaust pipes 4032 respectively disposed at two ends of the horizontal exhaust pipe 4031; each vertical exhaust pipe 4032 is respectively communicated with the interior of the carbonization furnace; each waste discharge pipe 404 is provided with an inlet pipe 4041 corresponding to each horizontal exhaust pipe 4031, and each inlet pipe 4041 is communicated with the middle part of the corresponding horizontal exhaust pipe 4031.

In the embodiment of the present invention, the diameter of each horizontal exhaust pipe 4031 is equal to the diameter of the corresponding vertical exhaust pipe 4032.

In the embodiment of the invention, the drift diameter of each waste discharge pipeline 404 is larger than that of the exhaust pipeline 403; preferably, the respective drift diameters of the waste pipes 404 are not more than 1.5 times of the drift diameter of the exhaust pipe 403; it is further preferable that the diameter of each exhaust pipe 404 is not more than 1.25 times the diameter of the exhaust pipe 403.

Through the above preferred arrangement, through the structural arrangement between the exhaust pipeline 404 and the exhaust pipe, under the condition of ensuring the structural strength of the pipeline joint, the ratio of the drift diameter and the passing area of the inlet pipe 4041 and the exhaust pipeline 403 of each exhaust pipeline 404 is reduced, the flow speed of the exhaust gas in the exhaust pipeline 404 is increased, the exhaust gas flows at a high speed to wash the inner wall of the exhaust pipeline 404, and the exhaust gas is prevented from being deposited as tar and attached to the inner wall of the pipeline.

It should be noted that, in the prior art, it is generally considered that, the larger the inner diameter of the waste discharge pipeline 4 of the low-temperature carbonization furnace 1 is, the larger the space for allowing the waste gas to pass through is, and the higher the waste discharge efficiency is; however, through observation of actual production conditions, it is found that if the inner diameter of the waste discharge pipeline 404 is too large, the exhaust gas flow rate is relatively low, and the passing time in the pipeline is increased, so that the deposition amount of carbonization reaction byproducts such as tar in the waste gas in the pipeline is greatly increased, the deposition amount of tar in the pipeline is too much, and an irregular obstacle formed in the pipeline after the tar is solidified is formed, so that an air path formed in the pipeline is complicated, the gas flowability is poor, and the waste discharge efficiency of the waste discharge pipeline 404 is greatly reduced; in the embodiment of the invention, the flow velocity of the waste gas is increased by adopting a technical means opposite to that of the prior art, so that the high-speed waste gas has a scouring effect on the inner wall of the waste discharge pipeline 404, and the tar deposition is effectively prevented.

As shown in fig. 1-5, by setting the relationship of the pipe diameters among the exhaust pipe 403, the waste discharge pipe 404 and the waste discharge header pipe 407, in the technical key of increasing the spinning speed of the carbonization line, the performance of the waste discharge pipe 4 of the carbonization furnace does not form an obstacle any more, the time required for successfully starting the carbonization line to reach the highest spinning speed is successfully shortened, the limit spinning speed of the carbon fiber carbonization system is successfully increased by 25%, and the yield and the economic benefit of the production line are improved; moreover, the waste discharge efficiency of the waste discharge pipe furnace is greatly improved, and the high position can be stably kept; when the waste discharge pipeline 4 is completely cleaned and maintained during regular parking, the amount of tar to be cleaned is greatly reduced, and the parking waiting time is shortened.

In the embodiment of the invention, a fan is arranged in the incinerator 3, the fan rotates to generate negative pressure, and waste gas formed in the low-temperature carbonization furnace 1 is sucked through the waste discharge pipeline 4; the waste gas flows out of the low-temperature carbonization furnace 1 through the exhaust pipes 403 distributed on the side wall of the hearth of the low-temperature carbonization furnace 1; after entering the exhaust duct 403, the exhaust gas firstly travels upward along the vertical exhaust pipe 4032, then travels to the upper end of the vertical exhaust pipe 4032, travels along the horizontal exhaust pipe 4031, and is delivered into the exhaust header pipe 407 through the exhaust duct 404.

Preferably, four vertical exhaust pipes 4032 are distributed on two sides of a hearth of the low-temperature carbonization furnace 1, two ends of each of the four horizontally extending horizontal exhaust pipes 4031 are respectively connected with the corresponding vertical exhaust pipe 4032, so that exhaust gases respectively exhausted from two sides of the hearth are convected in the horizontal exhaust pipes 4031, are converged below the currently started exhaust pipelines 404, are sequentially conveyed to the exhaust main pipe 407 through the exhaust pipelines 404, and are conveyed to the incinerator 3 through the exhaust main pipe 407 for combustion treatment.

Through the preferable arrangement, compared with the design that six vertical exhaust pipes 4032 are respectively arranged on each traditional low-temperature carbonization furnace 1, the exhaust pipes 403 can cover more positions in the hearth by additionally arranging the two vertical exhaust pipes 4032, so that the exhaust of the positions in the hearth where tar is more easily accumulated and deposited is realized by opening the corresponding vertical exhaust pipes 4032 in a targeted manner according to the difference of spinning speeds, and the exhaust efficiency is improved; meanwhile, more vertical exhaust pipes 4032 are opened along with the increase of the spinning speed to adapt to the waste gas generation rate increased along with the increase of the spinning speed, so that the problem that waste gas in a hearth cannot be discharged in time due to the fact that the total passing area of the opened vertical exhaust pipes 4032 is small is avoided.

In the embodiment of the invention, the peripheral pipe wall of the waste discharge pipeline 4 is wrapped with the heat-insulating layer; preferably, the heat-insulating layer is made of aluminum silicate felt, and the outer side of the heat-insulating layer is wrapped with aluminum sheets.

The embodiment of the invention also introduces the control method of the waste discharge pipeline 4 of the carbon fiber carbonization system, which is used for controlling each waste discharge pipeline 404 to be communicated with the carbonization furnace alternatively and judging whether the currently communicated waste discharge pipeline 404 is blocked or not, and if so, controlling the other group of waste discharge pipelines 404 to be communicated with the carbonization furnace.

In the embodiment of the present invention, the waste discharge pipe 404 includes a main waste discharge pipe 405 and a spare waste discharge pipe 406; and controlling the main waste discharge pipeline 405 to be communicated with the carbonization furnace, judging whether the main waste discharge pipeline 405 is blocked, and if so, controlling the standby waste discharge pipeline 406 to be communicated with the carbonization furnace.

In the embodiment of the invention, the spare waste discharge pipeline 406 is provided with a spare air inlet valve and a spare communication valve; and controlling the standby air inlet valve and the standby communication valve to be kept closed, judging whether the main waste discharge pipeline 405 is blocked, and if so, opening the standby air inlet valve and the standby communication valve.

Preferably, the carbonization furnace is a low temperature carbonization furnace 1.

In the embodiment of the invention, when the main waste discharge pipeline 405 is blocked, the waste discharge pipeline 404 is started, and the blocked main waste discharge pipeline 405 is communicated; by keeping the main waste discharge pipe 405 communicated, waste gas in the main waste discharge pipe 405 is discharged out of the main waste discharge pipe 405 through gaps between deposits under the condition that the main waste discharge pipe is not completely blocked, thereby preventing the waste gas in the main waste discharge pipe from being further cooled and deposited in the pipe to cause the main waste discharge pipe to be completely blocked, thereby reducing the cleaning difficulty and the time required for cleaning the pipe.

In the embodiment of the present invention, the outlet pressure of each waste pipe 404 and the inlet pressure of the direct-fired incinerator 3 are displayed on the screen of the central control unit in real time. If one of the values is too low and exceeds the normal range, the computer at the central control part can give an alarm, in order to eliminate the alarm, the inlet valve of the standby pipeline needs to be opened, and the two pipelines are discharged together.

In the embodiment of the invention, each vertical exhaust pipe 4032 is provided with a first valve, and the carbon fiber carbonization system opens a corresponding number of first valves according to the current spinning speed.

Preferably, at least 8 vertical exhaust pipes 4032 are distributed on the periphery of the low-temperature carbonization furnace 1, the carbon fiber carbonization system opens the first valves in corresponding quantity according to the current spinning speed, and judges to open the first valves in corresponding positions according to the distribution condition of each vertical exhaust pipe 4032, so that the opened vertical exhaust pipes 4032 are evenly distributed on the periphery of the low-temperature carbonization furnace 1.

Through the arrangement, in the process that the carbon fiber carbonization system runs at different spinning speeds, the positions of the low-temperature carbonization furnace 1, in which tar is easy to deposit, are different, the region in the furnace, in which tar is easy to deposit, is analyzed according to the spinning speed, and the vertical exhaust pipe 4032 near the corresponding region is opened, so that the exhaust efficiency is improved while the flow velocity of the exhaust gas in each opened vertical exhaust pipe 4032 is ensured; in addition, the deposition rate of tar in the hearth of the low-temperature carbonization furnace 1 can be increased along with the increase of the spinning speed of the carbonization line, in order to enable the waste discharge pipeline 4 of the low-temperature carbonization furnace 1 to adapt to high spinning speed, the vertical exhaust pipes 4032 are additionally arranged from six to eight, so that more areas in the low-temperature carbonization furnace 1 are covered by the inlets of the waste discharge pipeline 4, and when the spinning speed is increased, the vertical first valves in corresponding quantity are opened to meet the required higher waste discharge rate; in addition, the waste gas in the low-temperature carbonization furnace 1 is discharged in time, so that the tar deposition amount in the carbonization furnace is effectively reduced, and the occurrence frequency of the filament scraping condition is greatly reduced.

Example 3

Embodiment 3 of the present invention is different from the above-described embodiments in that embodiment 3 is a technical solution formed based on the combination of the above-described embodiments 1 and 2.

As shown in fig. 1 to 5, an embodiment of the present invention describes a waste discharge pipeline 4, and a heat tracing module 5 is respectively disposed on each waste discharge pipeline 4 communicated with a low temperature carbonization furnace 1.

In the embodiment of the present invention, each waste discharge pipeline 4 includes a plurality of exhaust pipelines 403 communicated with the low temperature carbonization furnace 1, each exhaust pipeline 403 is provided with a heat tracing module 5, and each heat tracing module 5 wraps the corresponding exhaust pipeline 403.

Through the setting, make the waste gas in each exhaust duct 403 heated to suitable temperature earlier and circulate to corresponding exhaust pipe 4 in, make the carbonization reaction accessory substance that waste gas contains keep the gaseous state through the intensification, avoid waste gas to take place the solidification deposition in exhaust pipe 404 and exhaust manifold 407 to further guarantee the unobstructed of each pipeline of exhaust pipe 4, reduce the clearance frequency to exhaust pipe 4.

In the embodiment of the present invention, each exhaust duct 403 includes a vertical exhaust pipe 4032 and a horizontal exhaust pipe 4031, and each heat tracing module 5 is disposed on each vertical exhaust pipe 4032 and/or on both ends of each horizontal exhaust pipe 4031.

In another embodiment of the present invention, each waste pipe 4 includes a waste header 407, and each heat tracing module 5 is wrapped around the waste header 407 adjacent to each waste pipe 404.

In the embodiment of the invention, each heat tracing module 5 is respectively communicated with the incinerator 3, and high-temperature clean gas generated by the incinerator 5 is conveyed into each heat tracing module 5 through a pipeline to heat the waste gas in each exhaust pipeline 4.

Through the arrangement, the heat tracing module 5 is provided with heat by utilizing the waste heat of the clean gas generated by the incinerator 3, so that the heat generated by the incinerator 3 is recycled, and the heat tracing module 5 heats the waste gas in the waste discharge pipeline 4, so that tar contained in the waste gas is kept in a gas state, the discharge is promoted, and the blockage is reduced; further, when promoting exhaust gas temperature, through the latus rectum ratio setting between each pipeline of exhaust pipe way 4, exhaust gas flow speed accelerates, further avoids the tar in the waste gas to take place the deposit in exhaust pipe way 4, reduces the condition emergence that exhaust pipe way 4 appears blockking up, can also reduce the frequency of regularly clearing up exhaust pipe way 4, promotes carbon fiber carbonization system's production efficiency.

The above description is only for the preferred embodiment of the present invention, and not intended to limit the present invention in any way, and although the present invention has been disclosed by the preferred embodiment, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications to the equivalent embodiment without departing from the scope of the present invention.

Claims (10)

1. A carbon fiber carbonization system, comprising,

a low-temperature carbonization furnace (1);

a waste discharge pipeline (4); is communicated with the low-temperature carbonization furnace (1) and is used for discharging waste gas generated in the low-temperature carbonization furnace (1);

the waste heat recovery device is characterized in that each waste discharge pipeline (4) is respectively provided with a heat tracing module (5), each heat tracing module (5) is communicated with a hot air module (7), and the hot air modules (7) respectively heat waste gas in the corresponding waste discharge pipelines (4) through the heat tracing modules (5).

2. A carbon fiber carbonization system according to claim 1, characterized in that the exhaust line (4) has an outlet for discharging exhaust gas;

the hot air module (7) comprises an incinerator (3) which is communicated with an air outlet of the waste discharge pipeline (4) and is used for incinerating waste gas discharged by the waste discharge pipeline (4);

the incinerator (3) is communicated with the heat tracing module (5) to convey high-temperature clean gas generated by the incinerator (3) into the heat tracing module (5) and heat waste gas in the waste discharge pipeline (4).

3. The carbon fiber carbonization system according to claim 2, further comprising a heat exchanger (6), wherein the heat exchanger (6) has an air inlet for introducing fresh air;

the heat exchanger (6) is communicated with the heat tracing module (5) and is used for exchanging heat between the clean gas flowing through the heat tracing module (5) and fresh air;

and/or the heat exchanger (6) is communicated with the incinerator (3) and is used for exchanging heat between the clean gas generated by the incinerator (3) and the fresh air.

4. A carbon fiber carbonization system according to claim 3, wherein a branch conduit is provided in the conduit connecting the incinerator (3) and the heat tracing module (5) and connected to the heat exchanger (6) for dividing the clean gas discharged from the incinerator (3).

5. A carbon fibre carbonization system according to claim 3, further comprising a drying device (8) for drying the carbon fibres; the heat exchanger (6) is communicated with the drying equipment (8) and is used for introducing fresh air subjected to heat exchange into the drying equipment (8).

6. A carbon fiber carbonization system according to any one of claims 1 to 5, wherein the waste discharge line (4) comprises at least a first waste discharge line (401) and a second waste discharge line (402), and the low-temperature carbonization furnace (1) is in communication with the incinerator (3) via the first waste discharge line (401) and/or the second waste discharge line (402), respectively;

the first waste discharge pipeline (401) and the second waste discharge pipeline (402) are respectively provided with a first heat tracing module (501) and a second heat tracing module (502).

7. The carbon fiber carbonization system according to claim 6, wherein the incinerator (3) is communicated with the air inlet end of the first heat tracing module (501), the air outlet end of the first heat tracing module (501) is communicated with the air inlet end of the second heat tracing module (502), and hot air in the hot air main pipe is enabled to sequentially pass through the first heat tracing module (501) and the second heat tracing module (502).

8. A carbon fiber carbonization system according to claim 7, characterized by further comprising a high temperature carbonization furnace (2); high-temperature waste gas generated by the high-temperature carbonization furnace (2) is communicated with the second waste discharge pipeline (402), so that the high-temperature waste gas can mix and heat the waste gas in the second waste discharge pipeline (402).

9. The carbon fiber carbonization system according to claim 1, wherein each heat tracing module (5) is a plate heat exchanger, and each heat tracing module (5) is wrapped around the corresponding waste pipe (4).

10. The carbon fiber carbonization system according to claim 2, wherein a furnace (301) for burning waste gas is provided in the incinerator (3), an ignition detector (302) for detecting fire and a regulating valve (303) for controlling the input of combustible gas into the furnace (301) are provided in the furnace (301), the opening of the regulating valve (303) is controlled by the ignition detector (302), the fire in the furnace (301) is regulated, and the air volume and temperature of clean gas to be output to the heat tracing module (5) are regulated.

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