4 replies to this topic

[Chem01]

Hello all,
I posted same question in Refiniong, hydrocarbon,....but this place seems more appropriate,,,

We've relocated sec. reformar of an ammonia plant to a new location and now refractory installation inside the reactor is in progress. Se. reformer will have catalyst bed for endothermic reforming reacton. Above the catalyst bed refractory is thicker due to high temperature of combustion zone ~ 1200 C. After catalyst bed starts, refractory thickness reduces as endothermic reaction will decrease the temperature of the process gas.
Question is, starting from top, up to what depth thicker refractory needs to be isntalled? exactly where catalyst bed starts or how much downward around the catalyst bed to be on safe side? drawing is attached for reference

Attached Files

•  sec._reformer_for_discussion__.pdf   24.95KB   72 downloads

[JoeWong]

Chem01,
No double posting. please....

[Art Montemayor]

Chem 101:

Kindly go back and read the Forum Guidelines. And stop making multiple postings of the same thread. You are making things harder for everyone including yourself when you make multiple posts. What do you suppose we, the potential responders, should respond to? Which Thread? Frankly, I'm getting very tired of having to delete all the multiple posts made by persons who refuse to follow the Forum Guidelines.

Stick to the Forum rules or stop posting. I am deleting the other, duplicate post.

[Chem01]

Apology for double posting,
the reson being i was in a hurry to be out for a meeting and when i clicked at industrial professional it was not opened rather the other link immediately works.
Even before posting here i opened the earlier post but could not see the option of deleting
I consider someone having refractory + process knowledge can reply.
Regards,

[Chem01]

No response to the query,,i've found some answers.
I was not able to find some standard reference but to be on safe side thicker refractory must come
to a certain length below the catalyst bed, like 600 mm in our case.
As refractory installation is in progress and new procurement can cause delays, therefore we asked refractory vendor to
calculate skin temperature of the vessel wall at the thin and thick portion by taking max temperature inside, when calculated the
difference was ~ 40 C and that still much below the design temperature of the vessel.
Therefore we do not go for a modification and keep thicker portion little above the catalyst bed.
Regards,