Hysys dynamic problems
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I am using Hysys for simulation; the number of trays is 41, the tray efficiency is 0.6, and the pressure drop across the tower is 35 KPA. I want to perform calculations using the theoretical number of trays, that is, the number of trays = 41 * 0.6 = 25. Does the pressure drop also need to be multiplied by 0.6? At steady state, I used 25 plates for simulation, and the tower pressure drop was not *0.6 either; it remained at 35 KPA, which is a decent result. However, when it is converted to dynamic mode, there is a large difference between the tower pressure and that in the steady state; could this be because the factor of 0.6 was not applied? I hope experts will kindly share their insights
There is a significant difference between a steady-state tower and a dynamic one. Moreover, the magnitude of the pressure drop has little to do with the efficiency of the trays; it depends only on the Cv of the tray, which is equivalent to the k Factor in the model. You can calculate an approximate value for the k Factor using the formula F=OP*Cv*sqrt(dp*p), and then input this value into the model. In this way, the pressure drop under dynamic conditions can be kept within an acceptable range, after which further fine-tuning can be done. Please feel free to offer any corrections
What was said on the 2nd floor is excellent; thank you!