Regarding loop operations in Hysys
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While performing a simulation of LNG liquefaction, a small amount of N2 was added to the feed gas at the beginning of the simulation. After the cycle was established, it was found that the liquefaction rate at -170°C was still less than 50%. It was later found that this might be due to an increasing accumulation of N2 entering the expander after several cycles. So I reduced the molar content of N2 in the incoming gas to 0. Here’s the problem: since the loop was already established earlier, Recycle fails to converge no matter how it is run. How can this problem be solved?
Thank you to everyone upstairs. I already know what’s going on. Just cut the wire that goes back in a loop to the Mixer at that point on the Mixer. Previously, the export route for Recycle was blocked, so it was impossible to get there. As for the documents, I just figured it out on my own; I got a good scolding from my master at noon, so I won’t show off my efforts.