Problems with heat exchanger piping. . . . .
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As shown in the two pictures above, how are h1 and h2 determined? ? Is local piping generally used in heat exchanger design? ?
This post was last written by wangtianyi* ao edited on 2011-6-30 13:44 There are specific requirements for the anti-collision plate on gb151 5.11.4: The distance between the outer surface of the anti-collision plate and the inner wall of the cylinder should be no less than 1/4 of the outer diameter of the nozzle
Reply 2# yangliudi79 I would like to ask, if there is no anti-collision plate, would there be more pipes? How to determine the height above the local pipe layout when there is no anti-collision board? ? Thanks
You asked on the 2nd floor whether there would be more tubes if there were no anti-collision plates. No, the number of tubes needed for a heat exchanger is calculated based on heat transfer calculations. The presence or absence of anti-collision baffles has nothing to do with the number of heat exchange tubes. It is only the setting of the anti-collision baffles that affects the arrangement of heat exchange tubes. position, since the distance from the outer surface of the anti-collision plate to the inner wall of the cylinder should be no less than 1/4 of the outer diameter of the nozzle, the pipe layout position must be adjusted accordingly to meet the requirements of 5.11.4. There is no specific limit when there is no anti-collision baffle, as long as it does not exceed the pipe layout limit circle.
What you said above is quite correct. You roughly know how many tubes to lay out (based on the flow rate, area required for heat transfer, and tube size). . . But there is a problem, for example, if you need 100 pipes and no anti-collision plate, choose a 325 shell diameter, 1 pass, and if it is full of pipes, you can lay out 114 pipes (19 pipes, 2 passes, no anti-collision baffle, 100 shell side pipes), if there is an anti-collision plate, 102 pipes, how should you lay out the pipes at this time? Local piping? What is the distance above? Are there standards? ?
I don't quite understand what you mean by local routing? Is the pipe layout asymmetrical due to the anti-collision plate?
Reply 6# letitbe Take a look at the picture I posted above, full tubes and partial tubes. . . Partial piping seems to be similar to piping when there are baffles. .
I'll send you a picture~~ This picture shows the dimensions with and without the baffle. . . When there is no baffle, as shown in the picture, is it just a partial pipe layout? How to determine the height? ?
My understanding is: The full distribution of tubes means that 120 tubes can be placed in the limited circle of the tubes. The required heat exchange process calculation is 120 tubes. This is the situation of full tube distribution. However, the process calculation only requires 80 pipes to meet the requirements. This is partial pipe routing, because there is a large area that belongs to the non-pipe routing area. The picture above shows a pipe layout situation with or without baffles. This is a partial pipe layout, and the area without pipe layout is very large.
I probably understand! ! For the same shell diameter, there is a maximum number of pipes, which can be reduced accordingly. . . . Can any number of tubes be reduced? There is a maximum value for the pipe routing limit circle. Can it be reduced accordingly? When I reduce the number of tubes, I usually start with the outermost tubes. I don’t know if I understand this correctly. . . .
It is right to reduce the number of tubes from the outer ring, but it must be arranged centrally symmetrically, so that the structure of the baffle will be simple. For example, if a single arcuate baffle is used, it only needs to be marked in one form, and the tube limiting circle is a fixed value.