A high temperature carbonization furnace with nitrogen gas curtain seal

Abstract

The utility model relates to a high temperature carbonization furnace with nitrogen gas curtain seal, it solved the technical problem that high temperature carbonization furnace lacks effective gas seal, it is equipped with high temperature carbonization furnace, is equipped with nitrogen sealing device on the port flange of high temperature carbonization furnace import and export, nitrogen sealing device is equipped with two groups of nitrogen gas injection pipe, nitrogen gas injection pipe is equipped with air inlet and gas hole, two groups of nitrogen gas injection pipe divide into upper nitrogen gas injection pipe and lower nitrogen gas injection pipe, and the upper nitrogen gas injection pipe and lower nitrogen gas injection pipe gas hole are oppositely arranged. The utility model can be widely applied to the sealing of high temperature carbonization furnace.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber production, and in particular to a high-temperature carbonization furnace with a nitrogen gas curtain seal. Background Technology

[0002] Carbon fiber possesses a series of excellent properties such as high specific strength, high specific modulus, low coefficient of thermal expansion, and good damping performance. It is the preferred reinforcement for high-performance composite materials and is widely used in aerospace, wind power generation, oil drilling, automotive industry, cultural and sports entertainment, and construction engineering.

[0003] The quality of carbon fiber is crucial to ensuring the superior performance of downstream products. It is made from PAN precursor yarn prepared by dry-jet wet spinning. To meet production requirements, carbon fiber is produced in bundles ranging from one hundred to several hundred simultaneously, running at a speed of 3-15 m / min. After oxidation and low-temperature carbonization, the carbon fiber enters a high-temperature carbonization furnace for further deep carbonization. If the oxygen content in the gas field of the high-temperature carbonization furnace is too high, it directly affects the carbonization effect of the carbon fiber and may even affect the service life of the graphite muffle, causing severe corrosion and damage to the graphite muffle in the high-temperature carbonization furnace. Summary of the Invention

[0004] To address the technical problem of existing high-temperature carbonization furnaces lacking effective gas sealing, this invention provides a high-temperature carbonization furnace with a nitrogen gas curtain seal.

[0005] This utility model provides a high-temperature carbonization furnace with a nitrogen gas curtain seal. The furnace is equipped with a high-temperature carbonization furnace, and nitrogen sealing devices are provided on the port flanges of the inlet and outlet of the high-temperature carbonization furnace. The nitrogen sealing devices are provided with two sets of nitrogen injection pipes, each with an inlet and an outlet. The two sets of nitrogen injection pipes are divided into an upper nitrogen injection pipe and a lower nitrogen injection pipe, and the outlets of the upper and lower nitrogen injection pipes are arranged opposite to each other.

[0006] Preferably, the nitrogen injection pipe is a square pipe, and square flanges are fixed on both sides of the square pipe. The square flanges are fixed on the port flanges of the inlet and outlet of the high-temperature carbonization furnace.

[0007] Preferably, the nitrogen injection pipe has two square tubes, and a steel plate is provided between the two square tubes. The steel plate and the square tubes are welded together to form two independent spaces. The air inlet is provided in the middle of each independent space, and the air inlet is provided with a flange.

[0008] Preferably, the air outlet is a conical countersunk hole with an included angle of 100° to 120°, the fan-shaped injection nozzles are evenly arranged, and the distance between adjacent air outlets is ≤20mm.

[0009] Preferably, the distance between the outlet holes of the upper nitrogen injection pipe and the lower nitrogen injection pipe is 180-200 mm.

[0010] Preferably, the nitrogen injection pipe is made of stainless steel.

[0011] Preferably, a buffer device is provided between the high-temperature carbonization furnace and the nitrogen sealing device.

[0012] The beneficial effects of this utility model are:

[0013] This invention introduces nitrogen gas at a suitable pressure and flow rate into a square tube through an upper and lower nitrogen inlet. The introduced nitrogen gas is then ejected through multiple fan-shaped vents set in four vertically oriented square tubes. The ejection surface forms a seamless air curtain within the sealing device. This air curtain completely isolates the interior of the nitrogen sealing device near the furnace body from the space away from the furnace body, thus completely isolating the interior of the high-temperature carbonization furnace from the outside air. Attached Figure Description

[0014] Figure 1 This is a front view of the furnace opening of the high-temperature carbonization furnace of this utility model;

[0015] Figure 2 yes Figure 1 Top view;

[0016] Figure 3 yes Figure 1 The left view;

[0017] Figure 4 yes Figure 3 Enlarged diagram of point A.

[0018] Explanation of symbols in the attached drawings:

[0019] 1. High-temperature carbonization furnace; 2. Nitrogen sealing device; 3. Nitrogen injection pipe; 4. Fan-shaped injection hole; 5. Square flange; 6. Screw hole; 7. Nitrogen upper inlet; 8. Nitrogen lower inlet. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, so that those skilled in the art to which the present invention pertains can easily implement the present invention.

[0021] Example 1: As Figure 1-4 As shown, this utility model includes a high-temperature carbonization furnace 1 and a nitrogen sealing device 2. The nitrogen sealing device 2 is installed on the port flanges at the inlet and outlet of the high-temperature carbonization furnace 1, and the flanges are fixed around the circumference by multiple M10 hex bolts.

[0022] Each nitrogen sealing device 2 has two sets of nitrogen injection pipes 3, one above the other. The nitrogen injection pipes are square tubes, and both sides of the square tubes are welded to square flanges 5 made of steel plates of a certain thickness. The square flanges 5 of the thick steel plates serve to seal the flange openings. One of the two square flanges 5 is connected to the port flange of the high-temperature carbonization furnace 1, and the other is connected to the outer upper and lower adjustment plate support, forming a complete sealed cavity. The upper and lower adjustment plate mechanism consists of upper and lower adjustment plates, worm gear adjustment mechanism, worm gear support, chain, etc. (not shown in the figure). Each nitrogen injection pipe 3 has two square tubes, separated by a steel plate and welded together. The two ends of the nitrogen injection pipe 3 are closed, forming two independent spaces. The upper nitrogen injection pipe 3 has two steel pipes with flanges along the upper edge of the square tube, which serve as the upper nitrogen inlets 7 for the two independent spaces. Each upper nitrogen inlet 7 is arranged at an equal position along the length of each square tube to ensure the uniformity of nitrogen injection. The lower edge has multiple downward-spraying conical countersunk holes forming fan-shaped air outlets. The included angle of each fan is between 100° and 120°, and the distance between adjacent fan-shaped air outlets is ≤20mm. The lower nitrogen injection pipe 3 also has two independent spaces with lower nitrogen inlets 8. The lower nitrogen inlets 8 are located at the lower edge of the lower nitrogen injection pipe 3, and the upper edge of the lower nitrogen injection pipe 3 has upward-spraying conical countersunk holes. The distance between the air outlet of the upper nitrogen injection pipe and the air outlet of the lower nitrogen injection pipe is ≤200mm, and is generally set at 180mm~200mm, so as to ensure good airtightness while facilitating the entry and exit of carbon fiber filaments.

[0023] The nitrogen injection pipe 3 is made of SUS304 stainless steel, which is corrosion resistant and meets the gas field requirements of the installation location of the nitrogen sealing device for the high-temperature carbonization furnace.

[0024] The nitrogen sealing device 2 has two sets of nitrogen injection pipes 3, one above the other, with the left and right sides of both sets of nitrogen injection pipes 3 being closed. A screw-on sealing strip is provided between the nitrogen sealing device 2 and the high-temperature carbonization furnace 1, which serves to seal and buffer the gas.

[0025] The nitrogen sealing device 2 employs multiple fan-shaped air outlets to vertically and counter-currently inject nitrogen, forming an air curtain. This is suitable for the production of any grade of carbon fiber, making it applicable to the production of any grade of product in a carbon fiber production line. The nitrogen sealing device 2 is also compatible with the installation dimensions and commissioning of any square-mouth high-temperature carbonization furnace. This invention provides excellent protection of the gas field within the high-temperature carbonization furnace of the carbonization production line, solving the technical problem of excessive oxygen content in the furnace cavity. It ensures continuous operation of carbon fiber products, improves the product's axial ratio, and guarantees product appearance quality and various product indicators.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the claims of the present invention should be within the protection scope of the present invention.

Claims

1. A high-temperature carbonization furnace with a nitrogen gas curtain seal, characterized in that, The inlet and outlet flanges of the high-temperature carbonization furnace are equipped with nitrogen sealing devices. The nitrogen sealing devices are equipped with two sets of nitrogen injection pipes. Each nitrogen injection pipe has an inlet and an outlet. The two sets of nitrogen injection pipes are divided into an upper nitrogen injection pipe and a lower nitrogen injection pipe. The outlets of the upper nitrogen injection pipe and the lower nitrogen injection pipe are arranged opposite to each other.

2. The high-temperature carbonization furnace with a nitrogen gas curtain seal according to claim 1, characterized in that, The nitrogen injection pipe is a square pipe, and square flanges are fixed on both sides of the square pipe. The square flanges are fixed on the port flanges of the inlet and outlet of the high-temperature carbonization furnace.

3. The high-temperature carbonization furnace with a nitrogen gas curtain seal according to claim 1, characterized in that, The nitrogen injection pipe has two square tubes, and a steel plate is provided between the two square tubes. The steel plate and the square tubes are welded together to form two independent spaces. The air inlet is provided in the middle of each independent space, and the air inlet is provided with a flange.

4. The high-temperature carbonization furnace with a nitrogen gas curtain seal according to claim 1, characterized in that, The air outlet is a conical countersunk hole with an included angle of 100° to 120°. The fan-shaped spray nozzles are evenly arranged, and the distance between adjacent air outlets is ≤20mm.

5. The high-temperature carbonization furnace with a nitrogen gas curtain seal according to claim 1, characterized in that, The distance between the outlet holes of the upper nitrogen injection pipe and the lower nitrogen injection pipe is 180-200 mm.

6. The high-temperature carbonization furnace with a nitrogen gas curtain seal according to claim 1, characterized in that, The nitrogen injection pipe is made of stainless steel.

7. The high-temperature carbonization furnace with a nitrogen gas curtain seal according to claim 1, characterized in that, A sealing strip is provided between the high-temperature carbonization furnace and the nitrogen sealing device.

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