Data input issue
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During the simulation of the absorption tower, in engineering practice, only the volumetric flow rate of one solution and the mass fraction of each component in it are known; these two values can be entered when specifying the material inputs. But in the Feeds and Products section of the tower equipment, there is another parameter that needs to be estimated: namely, how many moles of material are there at the top and bottom outlets of the tower. How should this be calculated? Do we calculate it by hand? I simulated the simplest absorption tower, but it still doesn’t converge. Assuming that all of the acidic gases are absorbed, why doesn’t it still converge?
Generally, a rough manual calculation should be sufficient to achieve convergence; let’s check whether there are any unreasonable settings elsewhere It seems that the IO of Pro relies quite little on the initial value
What was said on the 2nd floor makes sense. The original poster can check whether the thermodynamic approach and the property-based approach are appropriate
Is it because all the acidic gases are absorbed? However, it’s not possible to set the composition (flow rate) of acidic gases in the vapor stream at the top of the tower to zero; instead, a relatively small value should be used, such as 0.0001.