3 replies to this topic

[nastaran]

Hi everyone,

I’m supposed to review the sizing/calculation of a steam drum for which I’ve attached a schematic. The vendor has treated this steam drum as a conventional two-phase separator (with 86,250 kg/hr inlet and 85,000 kg/hr vapor outlet), and the circulation flow has not been considered in the calculations.

Do you think this approach is correct? In other words, is it acceptable to ignore the circulation flow rate in the steam drum design/sizing calculations?

 

Attached Files

•  steam drum.jpeg   63.55KB   0 downloads

[breizh]

Hi,

Why don't you share the sizing given to you? 

Can you provide a better description of your system in particular the contact between the steam from the reactor and the feed water in your drum? 

Probably good also to get a heat balance.

This should clarify the query.

 

Breizh

[nastaran]

There is an exothermic reaction on the tube side of the reactor. Water enters the shell side to utilize the released heat for steam generation.There is a natural circulation of the steam–water mixture between the reactor and the steam drum.The Calculation book has not been submitted.I have attached the sizing results.

 

Regards,

 

Attached Files

•  sizing.JPG   98.54KB   0 downloads

[breizh]

Thanks for sharing.

I'm still puzzled with your explanation. To me you should have an exchanger in between the reactor and the drum (separator), where the exotherm is transferred to the BFW. 

If my understanding is correct, the vapor from the reactor is condensed in the HX (shell) and converted to liquid returning to reactor.

The separator is designed based on the quality of steam from the BFW evaporation in the HX (tubes).

 

Please clarify.

Breizh