Selection method for the first plate at the inlet of the double-arch baffle in the heat exchanger
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When designing shell-and-tube heat exchangers, there are regulations regarding the choice of the first plate at the inlet for single-arch and double-arch baffle configurations. For double-arch baffles, the first plate at the inlet must be of the single-plate type (Plate A), and not of the two-plate type (Plate B). It’s not clear what the reason for this is Why must it be named this way?
I think the selection of baffles should take into account liquid distribution (flow velocity) and pressure drop issues. I think the choice of baffle is not limited to single-arch or double-arch types; there are also other shapes such as rectangular and circular ones.
Indeed, as the original poster said, many factors need to be considered when selecting baffle plates. I would like to ask that if other factors are taken into account and double-arch-shaped baffle plates are chosen, then why is plate A chosen for the first plate at the inlet of the double-arch-shaped baffle plates instead of plate B? On the surface, neither of them seems to have any obvious advantages or disadvantages
I’m sorry, but I haven’t come across any information in the materials I’ve seen regarding the rules you mentioned about choosing Board A or Board B. Could you share that information with us?
I’m really sorry; I also referred to materials compiled by my mentor in the past. What he wrote was based on reliable sources. I asked him, but as time has passed he no longer remembers where he found that information. This theory does indeed exist and it can’t be wrong. Once I find it, I’ll definitely share it here. By A plate and B plate, I mean the designations used on many materials; aren’t there two types of double-arch baffle plates? One of them is just one plate, while the other is two plates; I mean that at the inlet side it must be in the form of one plate. I’m not sure what the reasoning behind this is – couldn’t it also be done with two plates? Those who are interested in knowing this can please answer, or we can discuss it together.
I think it is necessary to consider the special flow conditions during import; the flow velocity at the pipe openings is high and the flow pattern is complex. Using baffle plates of the single-plate type can reduce flow dead zones and axial backflow, as well as minimize erosion of the tube bundle. Furthermore, I think the voltage drop of the single board should also be lower, and its heat transfer efficiency should be worse. It’s just my personal opinion; let those with experience share their views.
What was said upstairs makes sense; thank you! I wonder if anyone else has any other opinions?
Baffles are primarily used to prevent shock, distribute the fluid evenly, eliminate stagnation and dead zones, and change the direction of fluid flow.
1. It should be said that the double-arch baffle plates are divided into Type A and Type B; the baffle plates at the inlet of the heat exchanger should use Type A plates rather than Type B plates. Among them, Type A plates refer to whole plates with two openings, while Type B plates refer to two separate plates. 2. The purpose of this arrangement is to achieve a more uniform distribution of the fluid within the shell side, thereby improving the heat exchange efficiency of the heat exchange tubes. :)
Which one has a better heat exchange efficiency? I think snowboards are better.
Hehe, my understanding is exactly the opposite of yours. With a single plate, the pressure drop is lower and the heat transfer efficiency is better, whereas with two plates the pressure drop is higher and the heat transfer efficiency is poorer. We may not be able to clarify the specific reasons, and the exact calculations are also not very precise. It might be clearer if process simulation tests are used; once we have the test results, we can let everyone know. :handshake Last edited by c_m_1979 on 2007-12-7 20:35 ]
Thank you, Floor 11; looking forward to your results
Using plate A reduces the dead zone between the inlet and the second baffle plate (plate B), thereby making full use of the heat exchange area. Generally, unless there are special reasons, plate A is used for the first baffle plate.
I agree with what was said on floor 9; I focus solely on the equipment aspect, as I don’t understand the manufacturing process