FIELD: mechanical engineering. SUBSTANCE: outlet duct includes insert made in the form of flame-resistant and erosion- resistant envelope bonded by means of adhesive to backing made from moulding material or graphite and connected with walls of gas duct. Outer surface of insert is provided with circular grooves filled with fusible material. One groove is filled with material whose melting point is below decomposition temperature of adhesive and boiling point is above decomposition temperature of adhesive; subsequent groove is filled with material whose melting point is below boiling point of material of previous groove and boiling point is above melting point of material of previous groove. Boiling point of heat-resistant material is above temperature of working medium. EFFECT: enhanced efficiency. 2 cl, 1 dwg
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