Process for reducing the carbonization of heat exchange surfaces

Details Process for reducing the carbonization of heat exchange surfaces Process for reducing the carbonization of heat exchange surfaces

1994-10-11

1996-03-26

Lusignan, Michael

Coating processes

With post-treatment of coating or coating material

Heating or drying

134 2, 134 20, 134 39, 165 2, B05D 302, B05D 304

Patent

active

055018785

ABSTRACT:
A process for reducing the carbonization of the heat exchange surfaces in a tubular heat exchanger of boiler steel which, in particular, within a unit for the thermal cracking of hydrocarbons to alkenes and while producing steam, carries out the rapid cooling of the cracking products after they leave the cracking furnace. After the tubular heat exchanger is cleaned and before it is returned to service, the sides of the heat exchange surfaces which come into contact with the cracking products are treated under reducing conditions until the greatest possible reduction of the Fe.sub.2 O.sub.3 on the surface to Fe.sub.3 O.sub.4 has taken place, without submicron Fe powder being formed.

REFERENCES:
patent: 3532542 (1970-10-01), Shimizu et al.
patent: 4376694 (1983-03-01), Lohr et al.

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