Inward convex spoiling tube and manufacture method thereof

Abstract

The invention relates to an inward convex spoiling tube and a manufacture method thereof. More than one circle of inward convex factor groups is uniformly arranged on in the inner hole of a smooth wall tube along the axial direction of the smooth wall tube, each circle of the inward factor group comprises a plurality of inward convex factors, a spiral line which takes the axial line of the smooth wall tube as the center is formed by two inward convex factors which are closest in two adjacent inward convex factor groups in the circumferential direction of the smooth wall tube; a laser facing nozzle extends into the smooth wall tube, high-temperature alloy powder and agglutinant are mixed and delivered to the laser facing nozzle through a powder delivery tube; and the laser facing nozzle is used for facing the inward convex factors in the smooth wall tube correspondingly. The inward convex factors are faced by adopting laser in the inner wall of a furnace tube, and the spiral line which takes the axial line of the furnace tube is formed by the inward convex factors, so that liquid in the tube is delivered in a spiral manner to realize stable delivery and effective heat transfer of cracking liquid. The structure of the inward convex spoiling tube is simple, the velocity field in the tube flows symmetrically, the delivery is stable, and the radiation heat transfer effect is good; and the invention is applicable to inward convex spoiling tubes with various tube diameter specifications, is simple in manufacture process and low in production cost, and is applicable to processing with various tube diameter specifications.

Description

technical field [0001] The invention relates to the field of large-scale ethylene industrialized complete sets of equipment, in particular to an inner convex spoiler tube for a cracking furnace and a manufacturing method thereof. Background technique [0002] Enhancing heat transfer and inhibiting coking in cracking furnaces have always been an important research direction in the field of cracking. In order to alleviate coking and enhance heat transfer, traditional cracking furnace tubes are mostly changed by changing the diameter of the furnace tube, the number of tube passes, and the number of furnace tubes per pass. And other combination methods to improve radiation heat transfer, the effect of improving heat transfer is greatly limited by the cost of use and the space occupied by the furnace tube. At present, three structures of heat transfer furnace tubes are commonly used in industrial production: plum blossom tube, MERT furnace tube and twisted sheet enhanced heat tra...

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Problems solved by technology

[0003] Aiming at the deficiencies of the commonly used heat transfer furnace tubes in the prior art, such as complex structure, cumbersome manufacture, high cost, and inability to balance stable radiation heat transfer and application of different tube diameters, the present invention provides a simple structure, symmetrical flow of the conveying velocity field in the tube, The radiation heat transfer effect is good, and it is suitable for the inner convex spoiler used in various pipe diameters. The manufacturing process is simple, the production cost is low, and it is suitable for processing various pipe diameters.

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