What is the function of the globe valve at the inlet of the shell side of the high-pressure heat exchanger, as shown in the diagram?
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Tube side reaction products, shell side hydrogenated oil, as indicated in Note 6 of the figure
I still can’t see the image~~~
In hydrogenation units, when the reaction system is shut down and cooled, high-pressure heat exchangers are usually operated at full capacity to minimize heat exchange and thus accelerate the cooling process. However, due to the low pressure difference on the shell side, some of the circulating hydrogen still undergoes heat exchange there, which results in a slow cooling rate. Therefore, some units install valves on the shell side of the feed oil line; by closing these valves, it is possible to ensure that the circulating hydrogen flows through the bypass lines, thereby reducing heat exchange and accelerating cooling. In fact, in many hydrogenation units, in order to improve heat exchange efficiency, the feedstock generally flows through the tube side, while wound-tube exchangers are used for high-efficiency heat exchange.
First, define it: this valve is useless, even though I haven’t seen the diagram! It is not recommended to adjust the flow rate at the high-flow areas under any operating conditions. Additionally, it is best not to touch the high-pressure valves while they are in operation, as this can very easily lead to problems! Some design institutes, when adding valves, also install connection flanges on both the outlet and the pipes in the pipeline layer, so as to avoid high pressure under water flow! Personally, I don’t think it’s very meaningful! It’s not worth it to increase risks by investing more in a pressure increase! So I think that valve is useless~
The fewer valves there are in a high-pressure system, the better; it probably doesn’t make any difference
The more high-pressure valves, the more demon maidens. Many domestic process designs overcomplicate things, prioritizing convenience for a certain construction timeline at the expense of long-term operational stability and safety!