A control problem regarding the steam flow rate in a distillation tower
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How is the steam flow rate for a distillation column reboiler calculated? ? What is the relationship between this steam flow rate and the temperature inside the tower, the feed temperature, and the tower pressure? ?
The steam flow rate is first provided by the design institute; it’s likely that they determined it using ASPEN simulations as well. After that, adjustments are made based on actual conditions to achieve the optimal flow rate. Steam flow rate affects the temperature inside the tower; when the amount of steam is high, the temperature inside the tower rises, and the pressure increases, all other conditions remaining constant.
There’s an accumulated flow value on the flow meter; just take the difference and that’s it. .
Reply to 2# yihui007: I remember there being a formula for steam flow rate here; I’m not sure how that formula was derived
What formula? Write it down so everyone can see it and we can analyze it together?
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The steam flow rate is calculated based on the amount of evaporation that takes place. Specifically, it depends on how much heat Q is required for the material being evaporated. First, the material suitable for use in the heat exchanger is chosen based on the properties of that material; then, the heat exchange efficiency of steam with that material is taken into account, along with the designed heat exchange area for that material. By using these values, the steam flow rate can be determined. It’s not a very technical explanation, so please bear with me!
Of course, the above is determined based on the heat exchange per unit time!
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