CN-122013370-A - Low-temperature furnace for carbon fiber production and carbon fiber production method

CN122013370ACN 122013370 ACN122013370 ACN 122013370ACN-122013370-A

Abstract

The embodiment of the invention provides a low-temperature furnace for carbon fiber production and a carbon fiber production method, and relates to the technical field of carbon fiber production equipment. The low-temperature furnace for producing the carbon fibers comprises a furnace body, two groups of connecting seat groups, a plurality of plug-in electric heating tubes and a bracket, wherein the two groups of connecting seat groups are arranged on two opposite inner walls of the furnace body, each group of connecting seat groups comprises a plurality of connecting seats, the plurality of connecting seats are distributed along the length direction of the inner walls of the furnace body and are arranged in a one-to-one correspondence mode relative to the plurality of connecting seats on the two inner walls, each connecting seat and the side wall of the furnace body are provided with mounting holes which are mutually communicated, each mounting hole is internally provided with one plug-in seat, each electric heating tube is inserted into the plug-in seat, the bracket is arranged in the furnace body, a plurality of arc-shaped grooves are formed along the length direction of the bracket, each double-plug-in electric heating tube is composed of two electric heating short tubes, and the plug-in positions of the two electric heating short tubes are supported in one arc-shaped groove. The electrothermal tube in the low-temperature furnace provided by the invention is convenient to assemble and disassemble, and can realize axial and radial limiting.

Inventors

PEI HUAIZHOU
MAO HANWEN
YANG RUN
LI NAN
CHEN JUN
WU HAIYAN

Assignees

中复神鹰碳纤维连云港有限公司

Dates

Publication Date: 20260512
Application Date: 20260309

Claims (10)

1. The low-temperature furnace for carbon fiber production is characterized by comprising a furnace body, two groups of connecting seat groups arranged on two opposite inner walls of the furnace body, a plurality of plug-in seats, a plurality of double-plug-in electric heating tubes and a bracket; Each group of connecting seat groups comprises a plurality of connecting seats, the connecting seats are distributed along the length direction of the inner wall of the furnace body, and the connecting seats in the connecting seat groups are arranged in one-to-one correspondence with the connecting seats in the opposite connecting seat groups; each connecting seat and the side wall of the furnace body are provided with mutually communicated mounting holes, and each mounting hole is internally provided with one plug seat; Opposite ends of each double-plug-in electrothermal tube are respectively inserted into the plug-in seats on opposite side walls of the furnace body; The bracket is arranged in the furnace body and connected to the middle position of the bottom wall of the furnace body, the length direction of the bracket is parallel to the inner wall of the furnace body, on which the connecting seat is arranged, a plurality of arc-shaped grooves are formed in the surface, away from the bottom wall of the furnace body, of the bracket along the length direction of the bracket; each double-plug-in electric heating tube is composed of two electric heating short tubes with mutually-plug-in end parts, and the plug-in parts of the two electric heating short tubes are supported in one arc-shaped groove.
2. The furnace according to claim 1, further comprising two bracket supports, wherein the two bracket supports are triangular prism-shaped, and the two bracket supports are respectively arranged at two opposite sides of the bracket and are spliced with the bracket to form a trapezoid-shaped cross section.
3. The low-temperature furnace for producing carbon fibers according to claim 2, wherein the bracket is corundum mullite; optionally, the bracket supports the material and is light heat preservation refractory material.
4. The low-temperature furnace for carbon fiber production according to claim 1, wherein the socket is externally wrapped with a heat-insulating fireproof layer, and the heat-insulating fireproof layer is sequentially provided with a rock wool layer, a fireproof plate layer and an aluminum silicate plate layer from inside to outside; Optionally, the thickness of the rock wool layer is 50mm, the thickness of the fireproof plate layer is 50mm, and the thickness of the aluminum silicate plate layer is 30mm.
5. The low-temperature furnace for producing carbon fibers according to claim 1, further comprising at least one outer cover body, wherein the mounting holes penetrate through the side wall of the furnace body, and the at least one outer cover body is arranged on the outer wall of the furnace body in a covering manner so as to cover all the mounting holes; And a high-temperature-resistant sealing ring is arranged between the outer wall of the furnace body and the edge of the outer cover body.
6. The low-temperature furnace for producing carbon fibers according to claim 5, wherein the high-temperature resistant sealing ring is made of fluororubber; Optionally, the outer cover body is fixed on the outer wall of the furnace body through screws.
7. The low-temperature furnace for producing carbon fibers according to claim 1, wherein an arc-shaped buffer layer is attached to a wall of each arc-shaped groove.
8. The low-temperature furnace for producing carbon fibers according to claim 7, wherein the arc-shaped buffer layer is made of aluminum silicate fiber cotton; Optionally, the thickness of the aluminum silicate fiber cotton is 2mm.
9. The low-temperature furnace for producing carbon fibers according to claim 1, wherein the connecting seat is made of stainless steel and has a thickness of 10mm; optionally, each of the sockets has a diameter of 8mm and a length of 50mm.
10. A carbon fiber production method, characterized in that the carbon fiber production method according to any one of claims 1 to 9 is carried out using a low-temperature furnace.

Description

Low-temperature furnace for carbon fiber production and carbon fiber production method Technical Field The invention relates to the technical field of carbon fiber production equipment, in particular to a low-temperature furnace for carbon fiber production and a carbon fiber production method. Background The electrothermal tube of the low-temperature furnace for carbon fiber production is a furnace body temperature control core component, and the connection sealing effect directly influences the temperature stability in the furnace and the operation and maintenance efficiency and cost of equipment. The prior art has more defects, such as insufficient mounting limit, electric heating tubes are connected with furnace walls only through simple sleeving, no accurate limit structure exists in the axial direction, displacement is easy to occur due to heat expansion and cold contraction, radial supporting brackets are not needed, shaking and deflection are easy to occur during long-term use, uneven heating is caused, heat preservation and sealing defects are overcome, the electric heating tubes are wrapped by single-layer rock wool, heat preservation effects are poor, sealing is not tight, heat in the furnace is easy to lose, cold air outside the furnace is easy to infiltrate, a special high-temperature sealing structure does not exist at the furnace wall connection position, gas leakage causes furnace atmosphere fluctuation, replacement difficulty is high, a traditional electric heating tube is welded or bonded and fixed with the furnace walls, cutting or prying is needed to be conducted, 4 hours are needed to consume, the furnace wall structure is easy to damage, tar resistance is weak, tar is easy to generate during low-temperature furnace operation, penetrating around the electric heating tubes are corroded, the electric heating tubes need to be cleaned once every 24 hours, 1 time in the furnace is required to be repaired every 3 months, each half year of electric heating tube is replaced, service life is short, and production efficiency is low. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a low-temperature furnace for carbon fiber production and a carbon fiber production method, which aim to solve at least one of the problems in the background art. Embodiments of the invention may be implemented as follows: The invention provides a low-temperature furnace for carbon fiber production, which comprises a furnace body, two groups of connecting seat groups arranged on two opposite inner walls of the furnace body, a plurality of plug-in seats, a plurality of double-plug-in electric heating tubes and a bracket; each group of connecting seat groups comprises a plurality of connecting seats which are distributed along the length direction of the inner wall of the furnace body, and the plurality of connecting seats in the connecting seat groups are arranged in one-to-one correspondence with the plurality of connecting seats in the opposite connecting seat groups; each connecting seat and the side wall of the furnace body are provided with mutually communicated mounting holes, and each mounting hole is internally provided with a plug seat; opposite ends of each double-plug-in electrothermal tube are respectively inserted into plug-in seats on opposite side walls of the furnace body; The bracket is arranged in the furnace body and connected to the middle position of the bottom wall of the furnace body, the length direction of the bracket is parallel to the inner wall of the furnace body, on one surface of the bracket, which is far away from the bottom wall of the furnace body, a plurality of arc-shaped grooves are formed along the length direction of the bracket; Each double-plug-in electrothermal tube is composed of two electrothermal short tubes with mutually plug-in ends, and the plug-in positions of the two electrothermal short tubes are supported in an arc-shaped groove. In an alternative embodiment, the low-temperature furnace for producing carbon fibers further comprises two bracket supports, wherein the two bracket supports are triangular prism-shaped, and the two bracket supports are respectively arranged on two opposite sides of the bracket and are spliced with the bracket to form a trapezoid-shaped cross section. In an alternative embodiment, the bracket is made of corundum-mullite; optionally, the bracket supports the material of light heat preservation refractory material. In an alternative embodiment, the socket is wrapped with a heat-insulating fireproof layer, and the heat-insulating fireproof layer is sequentially provided with a rock wool layer, a fireproof plate layer and an aluminum silicate plate layer from inside to outside; Optionally, the thickness of the rock wool layer is 50mm, the thickness of the fireproof plate layer is 50mm, and the thickness of the aluminum silicate plate layer is 30mm. In an alternative embodiment, the low-temp