3 replies to this topic

[hazmee]

Dear Sir...

sorry for interrupting you.. i got a little confuse about this urea reactor, because of this reactor are about to operate at really high pressure, 145 bar.. so.. the question is..

is there really a urea reactor that have a perforated plate due to mixing purposes (bcos in this sort of reactor..

it shows that it is design under CSTR spec..) and if it is really use that high pressure, what will be the L/D of that particular reactor..

bcos one of the lecturer said that... at that high pressure.. we cn't really use the CSTR...please help.



thanks for ur cooperations..

[astro]

I appreciate that English may not be your first language, however please try to formulate your questions more sensibly. An SMS approach to grammar is a little difficult to follow.

From a quick internet search I came up with the following links that I will leave with you to self educate and answer your questions:
EFMA BAT - Urea
Stamicarbon Urea Reactor Brochure
Urea Casale Revamp Options

Regarding the use of a CSTR, the design, operations and maintenance difficulties with sealing an agitator inside a vessel operating at 145barg are considerable. Also, think about the reaction itself - mechanical agitation may not be required to promote mixing. Even if vigorous mixing is required, a static mixer offers the advantage of having no moving parts.

Not sure if this addresses the question (whatever it really is) but I hope this information at least gets you thinking.

[hazmee]

sorry for my broken english...

static mixer... can u explain it in detail... does the perforated plate considered as static mixer?

thanks..

[astro]

Yes, an array of perforated plates will act as a static mixer. I've seen this approach applied in industry for flue gas mixing in ductwork. Engineering criteria for detailed design are not something that I have at my fingertips, unfortunately.

The advantage of this approach is simplicity and low cost but I would expect that you would suffer pressure losses, which explains the premium place on proprietary designs.