FIELD: increasing volume of gaseous fuel. SUBSTANCE: ends of tubes of gas preheater are connected to torus-shaped tube sheets. Tubes may be made in form of multi-row coil located vertically or horizontally or in inclined position. Besides that, tubes may be made in form of coiled spring. EFFECT: improved operation of burners due to intensification of combustion of gas-and-air mixture. 5 cl, 5 dwg
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