Oxygen enriched cracker decoking

[brnm]

Does a decoking process or procedure involving oxygen enrichment of the air/steam mixture exist. If so, is it being used anywhere; was anything published, etc.?

Regards from Houston.

 

[oxilume]

brnm,

Can you please give detail information about your process stream and the coking problem?

 

[marcosmothe]

brnm
Decoking using a enriched mixture of air and steam is usual in ethylene plants. Mainly in naphta pyrolysis crackers. The ratio steam/air is increased in the decoking process due to control temperature inside the cracker. You can find some information with ABB Lummus or any other pyrolysis crackers suppliers.

 

[brnm]

marcosmothe,
I am familiar with decoking of light-feed crackers and thought the procedure was basically the same for heavy feed furnaces. Am I mistaken?

In my experience, the air/steam ratio is increased in steps up to some maximum, after the coke burn rate has decreased. Does "enhanced" oxygen refer only the to a higher air ratio, that is, not really enhanced?