Gas sealing device for continuous carbonization furnace

Abstract

The invention discloses a gas sealing device. The gas sealing device is suitable for gas sealing at the two ends of a continuous large-diameter carbonization furnace. The device comprises a front air inlet pipe, a middle air inlet pipe, a rear air inlet pipe, a gas seal chamber, a gas distribution disc, a furnace inner port, a material outlet, a heat insulation interlayer and a gas seal partition plate. The whole gas seal is in opening through type, the furnace inner port is connected with the inner portion of the carbonization furnace, and the material outlet is connected with the outside; a front inlet pipe controls the position and size of an air curtain through the size, arrangement and angle of an air hole, a branch pipe of the front inlet pipe is accompanied by auxiliary heating in the heat insulation interlayer to avoid the generation of an eddy; a middle gas pipe introduce inert gas into the inner portion of the gas seal chamber, and after the inert gas is distributed through the gas distribution disc, the multistage gas seal partition plate is formed into a multistage gas resistance layer for inhibiting oxygen diffusion; the rear air inlet pipe at the material outlet enhances the directional flow of the internal airflow from the inside to the outside, and inhibits the upward spread of the air. The opening degree of a furnace mouth can reach 10-30 centimeters, and the oxygen content can be reduced to less than or equal to 100 ppm.

Description

technical field [0001] The invention belongs to the field of carbonization treatment equipment for carbon fiber continuous filaments, in particular to an air-sealed structure of a continuous carbonization furnace, which is used for the carbonization treatment of mesophase pitch fiber pre-oxidized filaments in the key process in the preparation of pitch-based carbon fiber continuous filaments . Background technique [0002] The mesophase pitch fiber pre-oxidized yarn refers to the pre-oxidized pitch yarn obtained by the mesophase pitch fiber in an oxidizing atmosphere for non-melting treatment to improve thermal stability. In the subsequent carbonization process, the pre-oxidized filament can better maintain the shape of the fiber, and become a mesophase pitch-based carbon fiber with higher strength and modulus through the removal of non-carbon elements and the growth of crystals. On the one hand, since the strength of pre-oxidized filaments is only 10-50MPa, it is impossibl...

AI Technical Summary

Problems solved by technology

On the one hand, since the strength of pre-oxidized filaments is only 10-50MPa, it is impossible to realize engineering production through large-scale continuous drawing; stay high

If continuous carbonization is used, larger openings are required at both ends of the carbonization furnace, and the subsequent oxygen diffuses into the furnace along with the material transport, causing oxidation of the materials in the furnace, and ultimately affects the mesophase pitch base. Properties of Carbon Fiber

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