CN215976163U - Device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursor - Google Patents
Device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursor Download PDFInfo
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- CN215976163U CN215976163U CN202122194771.7U CN202122194771U CN215976163U CN 215976163 U CN215976163 U CN 215976163U CN 202122194771 U CN202122194771 U CN 202122194771U CN 215976163 U CN215976163 U CN 215976163U
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- steaming
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Abstract
The utility model relates to a device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursors, belonging to the field of high polymer material processing devices. The device comprises a heater, a labyrinth type sealing cavity and a steaming and pulling machine which are sequentially arranged on a filament path of polyacrylonitrile carbon fiber precursor; the labyrinth seal cavity is connected with the steaming and pulling machine, the heater is connected with the preheater and the circulating fan, a secondary preheating pipe is arranged in the middle of the labyrinth seal cavity, a secondary preheating air inlet pipe is arranged at the upper part of the secondary preheating pipe, a condensation drain pipe is arranged at the bottom of the secondary preheating pipe, the condensation drain pipe is connected with the preheater, and the device is used for longitudinally blowing and heating the precursor through compressed air at 30-60 ℃ so as to preheat the precursor once, preheat the precursor through low-pressure steam at 0.05-0.3MPa and steam at the outlet of the steaming and pulling machine for secondary preheating, and enable the precursor to enter the steam drawing machine under the condition of uniform heating, thereby realizing the uniformity of steaming and pulling.
Description
Technical Field
The utility model relates to the field of processing devices in the polymer chemical fiber industry, in particular to a device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursors.
Background
In the production process of polyacrylonitrile carbon fiber precursor, the steam drafting section plays an important role in the orientation degree and homogeneity of the precursor. At present, the uniformity of carbon fiber is greatly limited by the non-uniformity of the fineness of the produced carbon fiber precursor, and the subsequent composite material is greatly restricted in use. For this reason, the consistency of the draft is important in the steaming process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursors. The device realizes the uniformity of heating, improves the consistency of drafting, obviously reduces the titer CV value of the tows after steaming and drafting, and can be directly applied to industrial production.
A device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursors comprises: a heater, a labyrinth seal cavity and a steaming and pulling machine are sequentially arranged on a filament channel of the polyacrylonitrile carbon fiber precursor; labyrinth seal chamber links to each other with evaporating the machine of leading, and the heater links to each other with pre-heater and circulating fan, and the intermediate position in labyrinth seal chamber sets up the second grade preheating pipe, and second grade preheating pipe upper portion sets up second grade preheating intake pipe, and second grade preheating pipe bottom sets up the condensation drain pipe, and the condensation drain pipe links to each other with the pre-heater.
Compared with the prior art, the utility model has the following remarkable advantages:
1. the device of the utility model not only saves energy, but also ensures that cold spots caused by condensed water do not occur in the preheating process of the tows by means of the temperature of steam condensed water, the circulation of compressed air and the impact action of airflow at the steam outlet.
2. The utility model is suitable for the production of polyacrylonitrile carbon fiber precursor by wet method and dry spraying wet method, and can be used for reference in the production process of other fibers.
3. The device has strong universality and precedence in the field of polyacrylonitrile carbon fiber spinning production, and can be popularized and used in production.
Drawings
The utility model is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic of the present invention.
In the figure, A: a heater; b: a circulating fan; c: a preheater; d, a labyrinth seal cavity; e: a secondary preheating pipe; f: a condensation drain pipe; g: a steaming and pulling machine; h: and a secondary preheating air inlet pipe.
Detailed Description
The present invention will be further explained with reference to examples.
The device is suitable for the production of polyacrylonitrile carbon fiber precursor by a wet method and a dry spraying wet method.
The device includes:
a heater A, a labyrinth seal cavity D and a steaming and pulling machine G are sequentially arranged on a filament path of the polyacrylonitrile carbon fiber precursor; labyrinth seal chamber D links to each other with evaporating and leading machine G, and heater A links to each other with preheater C and circulating fan B, and labyrinth seal chamber D's intermediate position sets up second grade preheating pipe E, and second grade preheating pipe E upper portion sets up second grade preheating intake pipe H, and second grade preheating pipe E bottom sets up condensation drain pipe F, and condensation drain pipe F links to each other with preheater C.
Compressed air at 30-60 ℃ is introduced into the heater A to preheat the protofilament for the first time.
The compressed air in the heater A is preheated by using 0.1-0.6MPa of compressed air. The residence time of the filament bundle in the heater is 1-10 s.
The heating medium of the compressed air is a mixture of low-pressure steam and condensed water discharged from the second-stage preheating pipe E at the rear section. Two sides of the secondary preheating air inlet pipe H are provided with hole channels for low-pressure steam to enter from the hole channels at the two sides. The low-pressure steam enters from the pore channels at the two sides, so that the direct impact on the tows is avoided. And the impact of the airflow at the inlet of the steaming and pulling machine plays a role in removing and impacting the condensed water in the secondary preheating pipe.
The inlet of the secondary preheating pipe E and the connecting section of the secondary preheating pipe E and the steaming and pulling machine are both composed of labyrinth type sealing cavities.
The pressure of the low-pressure steam for the second preheating in the secondary preheating pipe E is 0.05-0.3 MPa.
The temperature of secondary preheating in the secondary preheating pipe E is 100-145 ℃, and then the secondary preheating pipe enters a steaming and pulling machine.
The working process of the device is as follows:
the protofilament is preheated by compressed air at 30-60 ℃ in a heater A, so that primary preheating is achieved. The heating medium of the compressed air is waste gas discharged by secondary heating and steam-pulling machine outlet gas at the rear section, and the compressed air is recycled.
The filament bundle is preheated for the second time under the combined action of low-pressure steam of 0.05-0.3MPa in the secondary preheating pipe E and the inlet steam of the steam drawing machine G, so that the filament bundle enters the steam drawing machine G under the condition of being heated to the temperature of 100-145 ℃, thereby realizing the uniformity of the steam drawing.
Example 1
When the utility model is used, 0.3MPa compressed air is heated to 60 ℃ and first preheating is started. And low-pressure steam of 0.1MPa is adopted in the secondary preheating pipe, and the filament bundle is secondarily heated to 110 ℃ when leaving the secondary preheating pipe. Then the filament bundle enters a steaming and drawing machine for drawing, and the obtained filament bundle titer CV value is less than or equal to 0.3 percent.
Example 2
When the utility model is used, 0.5Mpa compressed air is heated to 40 ℃, and the first preheating is started. And low-pressure steam of 0.3MPa is adopted in the secondary preheating pipe, and the filament bundle is secondarily heated to 130 ℃ when leaving the secondary preheating pipe. Then the filament bundle enters a steaming and drawing machine for drawing, and the obtained filament bundle titer CV value is less than or equal to 0.2 percent.
Example 3
When the utility model is used, 0.4Mpa compressed air is heated to 60 ℃ and first preheating is started. And low-pressure steam of 0.22MPa is adopted in the secondary preheating pipe, and the filament bundle is secondarily heated to 124 ℃ when leaving the secondary preheating pipe. Then the filament bundle enters a steaming and drawing machine for drawing, and the obtained filament bundle titer CV value is less than or equal to 0.2 percent.
Claims (3)
1. The utility model provides an improve device of polyacrylonitrile carbon fiber precursor steam drafting homogeneity which characterized in that: a heater, a labyrinth seal cavity and a steaming and pulling machine are sequentially arranged on a filament channel of the polyacrylonitrile carbon fiber precursor; labyrinth seal chamber links to each other with evaporating the machine of leading, and the heater links to each other with pre-heater and circulating fan, and the intermediate position in labyrinth seal chamber sets up the second grade preheating pipe, and second grade preheating pipe upper portion sets up second grade preheating intake pipe, and second grade preheating pipe bottom sets up the condensation drain pipe, and the condensation drain pipe links to each other with the pre-heater.
2. The device for improving the steam drafting uniformity of polyacrylonitrile carbon fiber precursors, according to claim 1, is characterized in that: two sides of the secondary preheating air inlet pipe are provided with hole channels for low-pressure steam to enter from the hole channels at the two sides.
3. The device for improving the steam drafting uniformity of polyacrylonitrile carbon fiber precursors, according to claim 1, is characterized in that: the inlet of the secondary heating pipe and the connecting section of the secondary heating pipe and the steaming and pulling machine are both composed of labyrinth type sealing cavities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122194771.7U CN215976163U (en) | 2021-09-11 | 2021-09-11 | Device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122194771.7U CN215976163U (en) | 2021-09-11 | 2021-09-11 | Device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215976163U true CN215976163U (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122194771.7U Active CN215976163U (en) | 2021-09-11 | 2021-09-11 | Device for improving steam drafting uniformity of polyacrylonitrile carbon fiber precursor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215976163U (en) |
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2021
- 2021-09-11 CN CN202122194771.7U patent/CN215976163U/en active Active
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