5 replies to this topic

[efwefsef]

can we export stem ejector model from hysys to aspen plus?

[pavanayi]

What are you trying to calculate? 

Ejectors are very difficult to rate/size using the simulation software. The only reliable answer will be from the vendor. 

[efwefsef]

i want to simulate a plant in aspen plus and for that i want an ejector.

[pavanayi]

Presumably you have sections of the plant operating under vacuum? If so, why not just set the pressure of the corresponding units to what it should be (at a vacuum) and proceed with the simulation? You don't necessarily need the ejector to set a pressure on a particular column or vessel.

[efwefsef]

yeah, but in actual plant i would require some equipment for that vacuum to be created and want to know the size of the equipment(may not be very accurate but an estimate).My question is that aspen hysys has steam ejector model in it, can i export this model to aspen plus.

[pavanayi]

I dont think you can use the models in Hysys in A+. Moreover, I will not even bother with the ejector model in Hysys, for the reasons I mentioned earlier.

From your A+ model, if you can get the flow rate of non condensibles, and you have an idea about the steam you want to use as the motive fluid, the size of the ejector can be obtained from a manufacturer. A vacuum pump can also be considered unless your plant has excess steam.