Process Area Activity – Determining the Number of Holes in 【So That’s How It Is-60】
Thread Content
It’s still related to stripping. In liquid-liquid separation processes, stripping is often employed: steam is introduced at a certain pressure to cause the liquid to churn, thereby bringing the low-boiling components to the surface for evaporation. Some of these components may form a binary azeotrope with one of the other components, which reduces the boiling point of the component that needs to be separated; hence, it is necessary to control the stripping pressure. To control the stripping pressure, in addition to installing a steam pressure regulator, it is also necessary to distribute the steam outlets; generally, the outlet end of the steam pipe is sealed, and small holes are created at various locations in varying numbers. The questions are how many holes to make, what the diameter of the holes is, and what the angle is. Previously, I saw that the stripping openings in some units were designed rather casually, which led to many problems; improvements were made to resolve many of these issues. First, it is necessary to determine the total area of the openings; generally, this area is 60-72% of the cross-sectional area of the steam stripping tube. Next, the diameter of the holes is determined, with a drill bit diameter of 3.0 being commonly used. Finally, the number of holes to be created is calculated. Next is the distribution of the holes; generally, there are two rows – one row right above and another row on the outside. The row on the outside is at an angle of about 20-30 degrees relative to the row right above. The 30-degree angle is not fixed; it must be determined based on the diameter of the tank and the height of the liquid level. In general, the extension line of the steam emerging from the external holes should not lie below the liquid surface nor on the wall of the tank. Over time, as the stripping process is used continuously, the holes gradually become larger. At this point, it is necessary to adjust the number of holes by sealing off a few of them in an appropriate manner.
I learned from the original poster – there are really many details to consider when making openings in chemical equipment ;P
It mainly comes down to calculation; the results of these calculations determine the size of the openings.
It’s valuable practical experience, which can be fed back into the design
The size and position of the openings also need to be carefully considered
Yes, there are many rules and regulations inside. :handshake
Hehe, I’m the type who just makes holes randomly. . . I’ve learned something new – so that’s how to open a hole.
The openings are areas where stress is concentrated; it is necessary to pay attention to reinforcing them
The porosity requirement is relatively high, around 1.5 times the diameter of the tube