Questions about HYSYS
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I have a gentle question: For a given LNG exchange, with three inlet streams 1, 2, and 3 corresponding to outlet streams 4, 5, and 6, if streams 1, 2, 3, 4, and 5 are fully defined along with the pressure drop, it is clearly possible to calculate the temperature of stream 6. Next, if the states of logistics 1, 2, and 3 are changed, can the temperature values of outlet logistics 4, 5, and 6 be calculated?
In other words, how can the output parameters change as the input parameters change?
It should not be sufficient to only know the inlet conditions; the outlet conditions for a fluid (cold or hot fluid) must also be defined.
For a tube-shell heat exchanger, if inlet streams 1 and 2 correspond to outlet streams 3 and 4, the state parameters (temperature, pressure) of streams 1, 2, and 3 can be determined through measurements; using HYSYS, it is possible to calculate the parameters (temperature) of stream 4 as well as the UA value of the heat exchanger. At this point, by changing the definition of the inlet stream (altering temperature and pressure) and entering the previously calculated UA value in HYSYS, it is possible to calculate the temperature values of the outlet streams 3 and 4. I also want to achieve such a process in LNG exchange; I’m not sure how to do it I would appreciate some guidance from those who are more experienced.
Since I am currently working on a project involving a light hydrocarbon recovery plant that is already in operation, and there are some actual production data available, I used HYSYS to simulate the process based on these data. Now I want to achieve the goal of changing the operational parameters in the process (such as the operating pressure and temperature of the tower, etc.), and use HYSYS simulation again to obtain all the parameters related to the process (such as the yield of light hydrocarbons, energy consumption, etc.), with the aim of optimizing these operational parameters. I don’t know how to implement such a process now?
In LNG-exchange, you can also specify UA to perform the calculations you desire. Add a constraint in SPECS: select UA for TYPE, OVERALL for PASS, and the Spec Valve is the UA that you want to control. Then select this Spec as Active. This way, it can be calculated. Of course, make sure the Degrees of Freedom are 0.
Hello, coolmoonns! ! You are truly an expert; following the methods you suggested, my problem has been solved. Thank you so much.