Help: Question regarding the capacity of a distillation tower
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Our company has a set of distillation columns for three-phase separation (light components, feedstock, heavy components), and we need the intermediate phase component. Specifically: 1. The diameter of the pre-distillation light tower is 1100 mm, and the diameter of the distillation tower is 1300 mm. 2. The tower is a high-efficiency packed tower, with stainless steel corrugated packing having a specific surface area of 500. 3. The packing height of Tower 1 is 16 meters, and that of Tower 2 is 20 meters. 4. The feed position for Tower 1 is at a height of 8 meters, while that for Tower 2 is at 12 meters. 5. Feed composition: One tower – light components 5-8%, material 86-88%, heavy components 4-6%. Two-tower: light components less than 0.2%, material content 90-92%, heavy components 6-8%. 6. Medium density: 0.91. 7. Average molecular weight 206. 8. For vacuum distillation. 9. The finished product quality index is greater than 99.5%
1. The flow rate in the distillation tower can be estimated at 2-3 m/s, which allows for a rough estimation of the processing capacity. 2. Your heating load needs to be calculated; if this heating load is not sufficient to achieve a flow rate of 2-3 m/s, then the processing capacity will be determined by the heating load
There is another issue: the pressure drop across our current tower is quite high. Feed rate: 1.5 cubic meters per hour. The reflux rate is 2.8 cubic meters per hour, with all feed being in liquid form. The output of the finished product is about 1.3 cubic meters per hour. The pressure drops at the top and bottom of the tower have reached 11 kPa.
This post was last edited and replied to by wangzenguo on 2012-1-9 at 10:24. Reply to 2# zhuwwzhu8: Thank you; I did the calculations based on what you said. Our maximum steam output is 12-18 tons per hour. (The gas-phase cross-sectional area is calculated as half of the tower diameter cross-sectional area, and the density is taken as 2.59 g/L.)
You must have miscalculated, bro! 12 tons of steam – even if water evaporates, 10 tons can still be vaporized. Your output is only 1.3 m3/h, with an R value of 2; that’s too low! !
I’m sorry, it seems I didn’t explain myself clearly. The 12 tons of steam I mentioned refers to the steam from the materials inside the tower. We use hot oil for heating; the maximum flow rate of the hot oil is 24 m³/hour, with a temperature difference of 30°C.
Is there anyone who can help come up with some ideas?
Does no one know? Expert experts, please help!