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Aspen issue

2017-05-09View Original

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Does anyone know how to solve this problem? The kinetic coefficient values are entered correctly, but this problem persists. Increasing the feed flow rate is also useless
Reply #22017-05-10
Is the unit correct? It would be best to upload the file for a look
Reply #32017-05-10
That’s the problem in this file; it just can’t be solved. Please help me take a look, senior
Reply #42017-05-11
Your version seems to be too advanced; I can’t open it
Reply #52017-05-11
This is version 8.4; could a senior please take a look?
Reply #62017-05-12
Just by looking at your kinetic data, it’s not easy to tell much, but I changed the flow rate of hydrogen, and the amount of product still changed. Take another look: is the unit for the activation energy kj/kmol, and is the pre-exponential factor k equal to 0.00092? Also, I see that you have specified T0, but at the same time you set n=0; doesn’t that mean that T0 is effectively not specified? Isn’t (T/T0)^n equal to 1 in the case of n=0?
Reply #72017-05-12
T0 is used to calculate K! There are two ways to express this kinetic equation! I know that changing the amounts of hydrogen and solid feedstock affects the quantity of product, and no serious errors occur as a result, but the problem mentioned at the beginning still persists
Reply #82017-05-16
T0 is used to calculate K! There are two ways to express this dynamic equation! Look at its formula: it is (T/T0)^n. What I mean is that T0 isn’t really necessary, because if n is set to 0, then (T/T0)^n will always equal 1. By the way, what was the question you mentioned initially? I didn’t see it
Reply #92017-05-16
The original problem is this diagram. It just can’t be solved; the dynamics should be fine

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