FIELD: production of carbon fibrous materials. SUBSTANCE: furnace has a set of unitized cylindrical modules with muffles, being mutually joined by movable connections. Inside of the muffle a graphite insert is mounted with formation of a gap and a cavity, defined by a flat, an inner surface of the muffle and slit-type graphite rings, and connected with a pipeline for heated inert gas and with a pipeline for pyrolysis products, mounted in a heat exchanger. The furnace has gas shutters, arranged at inlet and at output of the muffles one over another; heating members, a device for charging bundles being in the form of parallel closed contours of strings. The furnace has a connectable housing; a heat insulation layer is arranged between the housing and the muffle. EFFECT: enhanced structure of the furnace. 4 cl, 9 dwg
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