FIELD: heating system.
SUBSTANCE: heat-transfer tube comprises a curled partition located on the inner wall of the tube, wherein the curled partition extends helically along the axial direction of heat-transfer tube. The heat-transfer tube is fitted with a non-continuous concave, extending from one end to the other end of curved partition along the axial direction of heat-transfer tube.
EFFECT: heat transfer-tube and the cracking furnace according to the present disclosure have a good heat transfer effect and a low pressure loss.
13 cl, 11 dwg
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