How to design a liquid seal?
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In such a gas-liquid separation device, the liquid collected is discharged from the bottom, and this liquid may be viscous and prone to scaling. The internal gas gauge pressure is 30 kPa; does the U-shaped liquid seal need to be over 3 meters long? It doesn’t look good or attractive; the automatic drain valve is expensive and prone to clogging. I would like to ask the experts here – are there any good solutions?
I’m not sure what the situation is with your liquid receiving tank; it is recommended to use a bottom pipe to feed the liquid into the tank, and to connect a balance pipe from the top of the receiving tank to the gas outlet of the gas-liquid separator. Due to the viscous nature of the liquid and its tendency to form scale, the diameter of the liquid pipes should be larger, and measures to prevent blockages should be considered.
The liquid we collect is discharged directly into the original process tank through pipes, so there is no receiving tank at the bottom of the equipment. So, should we consider installing a liquid seal at the bottom of the separator? Do you have any good ideas to recommend?
It seems that this gas isn’t coming out easily. Can the gas be ensured to exit from the liquid inlet side?
This is installed on the pipeline; there are pipelines on both sides, gas pipelines. The separated liquid is then drained through the lower drainage pipe, but there is a concern that gases might also escape along with it.
Guys, could you help check if this approach is feasible?
Isn’t your design equivalent to manual drainage anyway?
HGT 20570.17 Installation of liquid seals
:Lol, if the discharge is continuous, you can replace the balance pipe with a nitrogen pipeline and add a control valve to automatically adjust the pressure, keeping the pressure inside the tank slightly below 30 kPa. Another option is to use your current design, but with the discharge valve linked to the liquid level so that discharge occurs periodically. It mainly depends on the properties of your material; I’m not sure how severe the scaling issue is as you mentioned；
A 3m liquid seal isn’t considered very high; I have several here that are 6m tall. In our system, a valve is installed on the main drainage pipe and remains open at all times; when the liquid seal needs to be maintained, the valve is simply closed. It seems unnecessary to use a balance pipe； The drain pipe should be placed above the liquid seal; a drain valve is not necessary – automatic overflow is sufficient.
Design a U-shaped bend 3 meters in height. A drain valve is installed at the bottom of the U-shaped bend to prevent blockages. One side of the U-shaped bend is connected to a liquid outlet for collecting the liquid, while the other side is open to the atmosphere. An outlet slope is provided to prevent the material from flowing down the pipeline; it is sufficient to regularly check the drain valve to ensure it is not blocked