DEVICE FOR OXIDATING POLYACRYLONITRILE FIBRES BY PRODUCING CARBON FIBRES Russian patent published in 2017 - IPC D01F9/12 D01F9/22 

FIELD: chemistry.

SUBSTANCE: device for oxidating polyacrylonitrile fibres by the production of carbon fibres contains a body 1 with removable end walls 5 having a through window 6 for input and output of the processed fibres 4, guide shafts 20 located outside the body 1. Inside the body 1 there is an oxidation chamber 2 with channels 3 for moving the fibres, which are combined into several temperature zones 8. Each temperature zone 8 is associated with at least one heater 15 and a fan 12. The temperature zones 8 are made insulated from each other, each of which is provided with a receiver cavity 9 and an aspirating cavity 10. Each receiver cavity 9 is connected to the pumping channel 11 of the fan 12 through the perforated walls 13 and channels 3 to move the fibres from one side of the chamber 2, and each of the aspiring cavity 10 is connected to the channels 3 to move the fibres from the other opposite side of the chamber 2, and the suction channel 14 of the heater 15. The device comprises means for removing exhaust gases from the oxidation chamber 2 that are connected to the pumping channel 11 of the fan 12 and means for enriching the oxidizing medium connected to the suction channel 14 of the heater 15. The means for removing exhaust gases and means for enriching the oxidizing medium are made in the form of nozzles 16, 18 with chokes 17, 19.

EFFECT: increasing the efficiency of heat treatment of PAN-fibres due to the equivalence of temperatures and velocities of gas flows, streamlined fibres in the channels of each temperature zone of the oxidation chamber.

2 cl, 3 dwg