MDEA reboiler Maximum Steam temperature
MDEA reboiler Maximum Steam temperature
(OP)
We are in the process of designing a MDEA regeneration reboiler. What is the max heat flux and what is the allowable Delta T? Can MP steam (about 180 Deg C) be used for heating?
Thanks in advance!!
Note.This was inadvertantly posted first in Chemical environmental Control forum first. Pl reply here. Thanks
Thanks in advance!!
Note.This was inadvertantly posted first in Chemical environmental Control forum first. Pl reply here. Thanks





RE: MDEA reboiler Maximum Steam temperature
RE: MDEA reboiler Maximum Steam temperature
RE: MDEA reboiler Maximum Steam temperature
I've heard of heat fluxes in the order of 19,000 kcal/(h.m2). It has been said that some thermal decomposition could take place if skin temperatures are higher than 160oC, but, since ternary amines, as MDEA, are more thermally stable, this has to be confirmed by the knowhow supplier. If the bulk temperature is 122oC this would mean a ΔT ~ 38oC.
RE: MDEA reboiler Maximum Steam temperature
I'd stop at 5000 kcal/hr as a direct fired with a pump system and 2000 kcal/hr as a direct no pump system. These should have no more than 10,000 btu/hr-ft^2 heat flux, 8000 would be very conservative.
RE: MDEA reboiler Maximum Steam temperature
I used to use hot oil in most of my systems, but am leaning more towards 350 Deg F glycol at the hottest to limit tube wall temps and heat flux.....having said that, the plants with hot oil are still working with no apparent amine degradation...go figure.