CN111235650A - Carbon fiber precursor steam drafting device with built-in water tank - Google Patents
Carbon fiber precursor steam drafting device with built-in water tank Download PDFInfo
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- CN111235650A CN111235650A CN202010237528.6A CN202010237528A CN111235650A CN 111235650 A CN111235650 A CN 111235650A CN 202010237528 A CN202010237528 A CN 202010237528A CN 111235650 A CN111235650 A CN 111235650A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/14—Stretch-spinning methods with flowing liquid or gaseous stretching media, e.g. solution-blowing
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Abstract
The invention discloses a steam drafting device with a built-in water tank for carbon fiber precursors, which comprises a steam box and a drafting system, wherein the drafting system comprises drafting machines positioned at two sides of the steam box and a yarn channel penetrating through the steam box; the steam box comprises a built-in water tank below the wire channel; the built-in water tank is communicated with the circulating water tank through a circulating pipeline; the built-in water tank is internally provided with an auxiliary heating coil communicated with a steam supply system, the auxiliary heating coil heats water in the built-in water tank to produce stable normal-pressure steam flow to finish a steam drafting process, the energy consumption of PAN precursor production is reduced, the cost is reduced, and the method is particularly suitable for preparing large-tow carbon fibers with low requirements on fiber performance.
Description
Technical Field
The invention relates to the technical field of chemical fiber manufacturing, in particular to a steam drafting device for carbon fiber precursors.
Background
The carbon fiber has the advantages of high specific strength, high specific stiffness, corrosion resistance, fatigue resistance, small thermal expansion coefficient and the like, and has the characteristics of combination designability, large-area integral forming, easy realization of structural function integration and the like of the reinforced resin matrix composite material. At present, domestic carbon fibers are mainly applied to three fields of aerospace, sports and leisure and industrial application, but the high-end application field is extremely low in percentage, and the main application field is concentrated in the low-end market. The carbon fiber is mainly divided into polyacrylonitrile-based carbon fiber, pitch-based carbon fiber, viscose-based carbon fiber and the like according to raw material sources, wherein the Polyacrylonitrile (PAN) -based carbon fiber occupies the leading position of the industrial production of the carbon fiber due to the excellent comprehensive performance and the simpler production process.
The steam drafting device is a key device (carbon fiber and graphite fiber, chemical industry press, 2010) for producing PAN-based carbon fiber precursors, water molecules permeate into the fibers in a steam drafting box body, drafting is simultaneously implemented under the plasticizing effect of the water molecules, PAN macromolecular chains are subjected to relative sliding and straightening, and are aligned and oriented along the axial direction of the fibers, so that fine denier, high orientation and high strength of the fibers are realized.
The steam drafting device that present carbon fiber trade used mostly is pressurization steam drafting machine, need use the boiler to provide high-pressure steam in the production to, need dispose corresponding pressurize part in order to guarantee even, the stability of steam temperature and pressure in the steam drafting incasement, it is big to have equipment energy consumption, characteristics such as inner structure complicacy, manufacturing cost height. Chinese patent application publication No. CN107447270A discloses a pressure-maintaining tube type drafting device with a sealed chamber, wherein the sealed chamber and an exhaust decompression chamber are arranged on two sides of the drafting chamber. Chinese patent application publication No. CN110273191A discloses a draft box sealed by an air curtain method, wherein an end processing device is disposed on at least one side of a draft chamber in the draft box, and an air curtain seal is formed by a first pressure air jet member in a first fiber opening sealing chamber in the end processing device.
However, in the civil field, for example, the building industry, the automobile manufacturing industry, the wind power blade industry and the like, the demand for carbon fiber is increasing, but the popularization and application of the carbon fiber are restricted by the high production cost of the carbon fiber. Therefore, it is highly desirable to develop a steam drawing device capable of reducing the production cost of PAN-based carbon fiber strands.
Disclosure of Invention
The invention provides a steam drafting device with a built-in water tank for carbon fiber precursors, wherein an auxiliary heating coil communicated with a steam supply system is arranged in the built-in water tank, and a stable normal-pressure steam flow is generated by directly heating water in the built-in water tank to finish a steam drafting process, so that the production energy consumption of PAN precursors is reduced, the cost is reduced, and the steam drafting device is particularly suitable for preparing large-tow carbon fibers with low requirements on fiber performance.
The technical scheme provided by the invention for solving the technical problems is as follows:
a steam drafting device for carbon fiber precursors comprises a steam box and a drafting system, wherein the drafting system comprises drafting machines positioned at two sides of the steam box and a yarn channel penetrating through the steam box; the built-in water tank is communicated with the circulating water tank through a circulating pipeline; an auxiliary heating coil communicated with a steam supply system is arranged in the built-in water tank, and the auxiliary heating coil heats water in the built-in water tank to generate steam.
The raw material polyacrylonitrile fiber is drawn into a steam box by a drawing machine and is led out by the drawing machine on the other side through a yarn channel; an auxiliary heating coil communicated with the steam supply system heats circulating water in the built-in water tank to generate stable normal-pressure steam flow to finish a steam drafting process.
Preferably, the built-in water tank is provided with a water tank top cover, and the thread passage penetrates between the water tank top cover and the built-in water tank.
In order to increase the heat of the top cover of the water tank and avoid forming condensed water on the top cover of the water tank so as to reduce the local temperature of polyacrylonitrile fibers to form a relatively cold point and generate broken filaments during drafting, preferably, a double-layer jacket is arranged outside the top cover of the water tank; a top cover heating coil communicated with a steam supply system is arranged in the double-layer jacket.
In order to prevent the condensed water on the top cover of the water tank from dropping, the top cover of the water tank is preferably an arched top cover.
In order to control the temperature of the circulating water in the circulating water tank, preferably, a circulating water heating coil is arranged in the circulating water tank and is communicated with the steam supply system.
In order to control the temperature in the circulating water tank and the temperature in the steam box to be constant and maintain the temperature requirement required by the process, the carbon fiber precursor steam drafting device preferably further comprises a temperature control system, the temperature control system comprises a steam box temperature controller and a first regulating valve arranged on a steam inlet pipeline of the steam supply system, and the opening of the first regulating valve is controlled by the steam box temperature controller.
When the steam box temperature controller detects that the temperature in the steam box is lower than the preset process temperature, the steam box temperature controller increases the opening of the first regulating valve, so that the steam quantity in the auxiliary heating coil and the circulating water heating coil is increased, and the temperatures of the steam box and the circulating water tank are increased. When the steam box temperature controller detects that the temperature in the steam box is higher than the preset process temperature, the steam box temperature controller reduces the opening of the first regulating valve and controls the temperature of the steam box and the temperature of the circulating water tank.
In order to reduce the temperature loss of the built-in water tank, preferably, a double-layer jacket is arranged outside the built-in water tank.
In order to control the water level in the steam box to be constant, preferably, the steam drafting device for carbon fiber precursors is further provided with a liquid level control system for controlling the water level in the steam box to be lower than the filament channel. The liquid level control system comprises a water level adjusting plate which is obliquely and vertically arranged at the bottom of the built-in water tank, and the water level adjusting plate is close to one side of a circulating water outlet of the steam tank; the water level adjusting plate comprises an upper adjusting plate and a lower adjusting plate, wherein the bottom of the upper adjusting plate is provided with an elongated slot, and the elongated slot is fixedly connected with the lower adjusting plate through a butterfly bolt; the circulating water inlet of the steam box is arranged at the other side far away from the water level adjusting plate.
Circulating water enters the built-in water tank through the circulating water inlet, overflows from the overflow port at the water level adjusting plate, flows into the circulating water tank through the circulating pipeline, and adjusts the water level in the steam tank by adjusting the overlapping position of the upper water level adjusting plate and the lower water level adjusting plate.
In order to realize the automatic water replenishing of the circulating water tank, the liquid level control system preferably further comprises a liquid level meter positioned in the circulating water tank and a second regulating valve positioned on a water inlet pipeline of the circulating water tank, and the opening degree of the second regulating valve is controlled by the liquid level meter.
When the water level of the circulating water tank is too low, the liquid level meter can increase the opening of the second regulating valve to supplement water to the circulating water tank; when the circulating water tank water level is too high, the liquid level meter can reduce the aperture of the second regulating valve.
The regulating valve is a pneumatic regulating valve, an electric regulating valve or a hydraulic regulating valve.
In order to prevent the generated water vapor from diffusing outwards in the heating process, reduce the overflow of the water vapor from the yarn inlet and outlet and ensure the stability of the water vapor in the drafting chamber, preferably, the steam box is provided with a yarn inlet labyrinth seal at the inlet through which the yarn channel passes, and a yarn outlet labyrinth seal at the outlet.
In order to prevent the generated water vapor from diffusing outwards in the heating process and ensure the stability of the vapor in the drafting chamber, a high-temperature-resistant fluorine adhesive sealing strip is arranged outside the combination surface of the built-in water tank and the top cover of the water tank.
In order to filter broken filaments and broken filaments generated in the production process and prevent circulating water from generating larger steam water molecules in the heating process, preferably, a filter screen is arranged between the filament channel and the auxiliary heating coil.
The invention has the following beneficial effects:
1. the steam drafting device for the carbon fiber precursors is provided with the built-in water tank, can generate stable normal-pressure steam flow by heating circulating water in the built-in water tank to finish a steam drafting process, can effectively reduce the production energy consumption of the carbon fiber precursors, and is applied to the preparation of large-tow carbon fibers with low cost and low requirements on fiber performance.
2. The steam drafting device for the carbon fiber precursor ensures the constancy of the steam quantity and the temperature in the steam box through the circulating water tank, the liquid level control system and the temperature control system, and ensures the stability of the performance of the PAN precursor.
3. According to the steam drafting device for the carbon fiber precursor, the top cover heating coil is arranged on the top cover of the water tank, and double layers of heat preservation are carried out, so that the influence of generated condensed water on the quality of the PAN precursor is avoided.
Drawings
Fig. 1 is a schematic structural view of an embodiment of a steam drawing apparatus for carbon fiber precursor according to embodiment 1 of the present invention.
Fig. 2 is a side view of a steam box in an embodiment of the steam drawing device for carbon fiber strands according to embodiment 1 of the present invention.
The reference numerals shown in the figures are as follows:
1-steam box 2-circulating water tank 3-built-in water tank 4-tank top cover
5-filter screen 6-auxiliary heating coil 7-circulating water inlet 8-circulating water outlet
9-wire path 10-labyrinth seal 11-top cover heating coil 12-steam box temperature controller
13-first pneumatic regulating valve 14-circulating water heating coil 15-water level regulating plate 16-upper regulating plate
17-lower regulating plate 18-liquid level meter 19-second pneumatic regulating valve 20-drafting machine
21-water level adjusting port 22-fluorine rubber sealing strip 23-steam inlet pipeline 24-steam box water inlet pipe
25-Water Pump
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
A carbon fiber precursor steam drafting device is shown in figure 1 and comprises a steam box 1, a circulating water tank 2, a temperature control system, a liquid level control system, a drafting system and a steam supply system.
The steam box 1 comprises a built-in water tank 3 and a water tank top cover 4, as shown in fig. 2, a filter screen 5 and an auxiliary heating coil 6 are sequentially arranged in the built-in water tank 3 from top to bottom, a circulating water inlet 7 and a circulating water outlet 8 are arranged on the side face of the box body, and the built-in water tank is communicated with the circulating water tank 2 through a water inlet and outlet pipeline. In the working process, the auxiliary heating coil 6 is used for heating water in the built-in water tank 3 to generate steam, and the carbon fiber precursor steam drafting process is carried out.
A thread channel 9 is arranged between the built-in water tank 3 and the water tank top cover 4, labyrinth seals 10 are arranged at two ends of the thread channel 9, so that the outward diffusion of water vapor generated in the heating process can be prevented, the overflow of the steam from a thread inlet and outlet is reduced, and the stability of the steam in the steam box 1 is ensured. The inlet and outlet screw mouth is also provided with an air suction pipe, and the air suction pipe is provided with a valve with adjustable opening degree so as to suck the steam overflowing from the inlet and outlet screw mouth of the steam box and prevent the steam from wetting the fiber when meeting condensation. The filter screen 5 is arranged between the wire channel 9 and the auxiliary heating coil 6 and plays a role in filtering broken wires and broken wires generated in the production process.
The water tank top cover 4 is provided with a double-layer jacket, and a top cover heating coil 11 communicated with a steam supply system is arranged in the jacket. In the working process, steam is introduced into the top cover heating coil pipe 11, so that the heat of the top cover of the steam box is increased, the phenomenon that condensed liquid drops on fibers formed on the top cover is avoided, the local temperature of polyacrylonitrile fibers is reduced to form a relatively cold point, and broken filaments are generated during drafting. The tank roof 4 is designed to be arched, so that if steam condenses into water on the roof, the steam can flow back to the built-in tank 3 along the wall, and is prevented from dripping on the fibers. The joint surface of the water tank top cover 4 and the built-in water tank 3 is provided with a high-temperature resistant fluorine rubber sealing strip 22 to ensure the sealing performance between the water tank top cover 4 and the built-in water tank 3 and prevent the leakage of steam.
The circulating water tank 2 is communicated with the steam box 1 through a circulating pipeline, and a water pump 25 is arranged on a steam box water inlet pipe 24 of the circulating pipeline. In the working process, the water pump 25 pumps the water in the circulating water tank 2 into the steam box 1. A circulating water heating coil 14 communicated with a steam supply system is arranged in the circulating water tank 2. In the working process, the circulating water heating coil 14 heats the water in the circulating water tank 2, so that the circulating water keeps the temperature required by the process.
The steam drafting device for the carbon fiber precursor is also provided with a temperature control system which comprises a steam box temperature controller 12 in a water tank and a first pneumatic regulating valve 13 arranged on a steam inlet pipeline 23 of a steam supply system. In the working process, when the steam box temperature controller 12 detects that the return water temperature at the overflow port of the built-in water tank is lower than the preset process temperature, the steam box temperature controller 12 increases the opening of the first pneumatic regulating valve 13, so that the steam quantity in the auxiliary heating coil 6, the circulating water heating coil 14 and the top cover heating coil 11 is increased, and the temperatures of the steam box 1 and the circulating water tank 2 are increased. When the steam box temperature controller 12 detects that the temperature in the steam box 1 is higher than the preset process temperature, the steam box temperature controller 12 reduces the opening of the first pneumatic regulating valve 13 to control the temperature of the steam box 1 and the temperature of the circulating water tank 2.
The liquid level control system comprises a steam box liquid level adjusting part and a circulating water tank liquid level adjusting part.
Adjusting the liquid level of the steam box: a water level adjusting plate 15 is arranged inside the built-in water tank 3 and close to one side of the circulating water outlet 8, and consists of an upper plate and a lower plate, wherein the bottom of the upper adjusting plate 16 is provided with an elongated slot which is fixedly connected with a lower adjusting plate 17 through a butterfly bolt. In actual work, the positions of the upper adjusting plate and the lower adjusting plate can be adjusted according to process requirements to control the water level in the box body, and the water level in the box body is controlled to be higher than the auxiliary heating coil 6 and lower than the filter screen 5 while the water level is kept constant. In the working process, when the water level in the steam box 1 is too high, the water overflows through the water level adjusting port 21 and flows into the circulating water tank 2 through the circulating water outlet 8 to keep the liquid level in the tank stable, so that the steam quantity generated by the steam box 1 is basically constant.
A liquid level meter 18 arranged on the circulating water tank 2 and a second pneumatic regulating valve 19 arranged on the water inlet pipe of the circulating water tank form a liquid level control system of the circulating water tank. The level gauge 18 can be used for detecting the level of the liquid in the water tank, and the opening degree of the second pneumatic regulating valve 19 is controlled to realize automatic water supplement to the circulating water tank 2.
The drafting system comprises drafting machines 20 on both sides of the steam box 1 and a yarn channel 9 passing through the steam box 1. In the working process, polyacrylonitrile fibers are drawn in by the drawing machine 20 on the left side of the steam box 1, sequentially pass through the sealed cavity of the labyrinth seal of the yarn inlet, the yarn channel 9 and the sealed cavity of the labyrinth seal of the yarn outlet, are drawn out by the drawing machine 20 on the right side, and are drawn by the speed difference of the drawing machines 20 on the two sides.
Claims (10)
1. A steam drafting device with a built-in water tank for carbon fiber precursors comprises a steam box and a drafting system, wherein the drafting system comprises drafting machines positioned at two sides of the steam box and a yarn channel penetrating through the steam box; the built-in water tank is communicated with the circulating water tank through a circulating pipeline; an auxiliary heating coil communicated with a steam supply system is arranged in the built-in water tank, and the auxiliary heating coil heats water in the built-in water tank to generate steam.
2. The steam drafting device for carbon fiber precursor as claimed in claim 1, wherein the built-in water tank is provided with a water tank top cover, and the yarn passage passes between the water tank top cover and the built-in water tank.
3. The steam drafting device for carbon fiber precursors as claimed in claim 2, wherein a double-layer jacket is provided outside the top cover of the water tank; a top cover heating coil communicated with a steam supply system is arranged in the double-layer jacket.
4. The steam drafting device for carbon fiber strands as claimed in claim 3, wherein the water tank cover is an arched cover.
5. The steam drawing device for carbon fiber precursor as claimed in claim 1, wherein a circulating water heating coil connected to a steam supply system is provided in the circulating water tank.
6. The steam drafting device for carbon fiber precursor as claimed in any one of claims 1 to 5, further comprising a temperature control system, wherein the temperature control system comprises a steam box temperature controller and a first regulating valve provided on a steam inlet pipeline of the steam supply system, and the opening of the first regulating valve is controlled by the steam box temperature controller.
7. The steam drafting device for the carbon fiber precursor as claimed in any one of claims 1 to 5, wherein the steam drafting device for the carbon fiber precursor is further provided with a liquid level control system, the liquid level control system comprises a water level adjusting plate which is obliquely erected at the bottom of the built-in water tank, and the water level adjusting plate is close to one side of a circulating water outlet of the steam tank; the water level adjusting plate comprises an upper adjusting plate and a lower adjusting plate, wherein the bottom of the upper adjusting plate is provided with an elongated slot, and the elongated slot is fixedly connected with the lower adjusting plate through a butterfly bolt; the circulating water inlet of the steam box is arranged at the other side far away from the water level adjusting plate.
8. The steam drafting device for carbon fiber precursor as claimed in claim 7, wherein the liquid level control system further comprises a liquid level meter disposed in the circulating water tank and a second regulating valve disposed in a water inlet pipe of the circulating water tank, and an opening degree of the second regulating valve is controlled by the liquid level meter.
9. The steam drafting device for carbon fiber precursor as claimed in claim 1, wherein a screen is provided between the filament path and the auxiliary heating coil.
10. The steam drafting device for carbon fiber precursors as claimed in claim 2, wherein a high temperature resistant fluorine glue sealing strip is provided outside the joint surface of the built-in water tank and the top cover of the water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010237528.6A CN111235650A (en) | 2020-03-30 | 2020-03-30 | Carbon fiber precursor steam drafting device with built-in water tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010237528.6A CN111235650A (en) | 2020-03-30 | 2020-03-30 | Carbon fiber precursor steam drafting device with built-in water tank |
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| CN111235650A true CN111235650A (en) | 2020-06-05 |
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| CN202010237528.6A Pending CN111235650A (en) | 2020-03-30 | 2020-03-30 | Carbon fiber precursor steam drafting device with built-in water tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116940722A (en) * | 2021-03-01 | 2023-10-24 | 迪策和谢尔机械两合公司 | Method for producing at least one thread, vapor deposition device for carrying out said method, and thread production device comprising said vapor deposition device |
-
2020
- 2020-03-30 CN CN202010237528.6A patent/CN111235650A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116940722A (en) * | 2021-03-01 | 2023-10-24 | 迪策和谢尔机械两合公司 | Method for producing at least one thread, vapor deposition device for carrying out said method, and thread production device comprising said vapor deposition device |
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