Abstract
Heat resistant cast tubes have been used for ethylene cracking furnace. Creep strength, carburization resistance, and anti-coking characteristics are required for the tubes. We have developed a clad tube for ethylene cracking furnace, named PTT, which inner surface was claded with special metal by Plasma Powder Welding process. PTT have been introduced into the commercial furnaces and evaluated the performance. Results of the practical application trials were compared with conventional ethylene cracking furnace tubes and concluded as follows. 1) PTT in commercial furnaces showed longer run length by lower TMT (Tube Metal Temperature) tangent. Improvement of feed rate was also confirmed. 2) PTT's overlaid layer had Cr2O3 layer with no Fe. The oxide layer is considered to prevent catalytic coke formation. 3) Superior carburization resistance was confirmed by EPMA analysis. PTT's overlaid layer with high Cr content is considered to prevent carburization of the tube. 4) Superior carburization resistance and anti-coking characteristics of PTT are confirmed. Extensions of run-length and tube life are realized by PTT.
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