Pyrolysis Furnace Tubes

摘要

The invention relates weldments useful as heat transfer tubes in pyrolysis furnaces. The invention relates to tubes that are useful in pyrolysis furnaces. The weldments include a tubular member and at least one mixing element. The tubular member comprises an aluminum-containing alloy. The mixing element comprises an aluminum-containing alloy. The mixing element's aluminum-containing alloy can be the same as or different from the tubular member's aluminum-containing alloy. Other aspects of the invention relate to pyrolysis furnaces which include such weldments, and the use of such pyrolysis furnaces for hydrocarbon conversion processes such as steam cracking.

主权项

1. A weldment suitable for use in a pyrolysis furnace, the weldment comprising:
a) a first tubular member comprising a first steam cracker alloy and having inner and outer surfaces; and b) one or more mixing elements in surface contact with the inner surface of the first tubular member, at least one of the mixing elements comprising a second steam cracker alloy, wherein;
(i) the first steam cracker alloy comprises A1 wt. % aluminum, based on the weight of the first steam cracker alloy,(ii) the second steam cracker alloy comprises A2 wt. % aluminum, based on the weight of the second steam cracker alloy, and(iii) A1 is ≧2.0 wt. % and A2 is ≧2.0 wt. %.