Severe liquid carryover at the outlet of the liquefied gas desulfurization tower?
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The liquefied gas desulfurization tower I have installed uses MDEA amine solution to absorb hydrogen sulfide from the liquefied gas. After the liquefied gas has been purified of sulfur compounds, it enters a amine separation tank where the amine solution is separated; subsequently, a coalescer is used to remove any remaining amounts of amine solution. However, in practice, a large amount of amine solution ends up in the subsequent processing stages, resulting in losses of this amine solution. What is the cause of this? Amine solution foaming? Is the design level gauge for liquefied gas and amine liquid set too high? Is the LPG pressure still low? Operation parameters: the pressure at the top of the liquefied gas tower is 1.1 Mpa, the flow rate is less than 18 t/h, and the feed rate of amine solution is 8 t/h. I would appreciate some guidance from those with more experience; thank you
What is the operating temperature, and what is the liquid content at the inlet of the coalescer? There must be a problem with the design of the coalescer; according to current coalescing separation technologies, the liquid content should be at the PPM level
Firstly, the operating pressure for liquefied gas desulfurization is not low, which is within the normal range; it is normal for a small amount of amine to be present in the liquefied gas, and this cannot be avoided. If a large amount of amine is present, please investigate the following: 1. Is the flow rate of 18 t/h for the liquefied gas exceeding the designed capacity? Is there an issue with the line speed being too high? 2. Check whether the temperature of the lean liquid and liquefied gas is too high 3. Is the amine solution contaminated, and are there any foaming issues?
Whether the foam breaker at the top of the liquefied gas desulfurization tower is damaged, and whether the amine feed distributor is installed properly
The separator is not effective; it does not achieve good results. Either the gas velocity is too high, leading to secondary entrainment and resulting in problems!
It’s most likely due to a high rank……
Appropriately reduce the processing volume, lower the interposition, and slightly increase the operating pressure
1. The gas velocity is too high, resulting in severe liquid entrainment. 2. The demister is not effective. 3. The floating valve tray itself involves a bubbling process; over time, the heat-stable salts and impurities generated by the amine solution cause severe bubbling, preventing full-load operation. It is recommended to replace it with a membrane spray tray. There are many successful application cases; feel free to message me if you need them.
The coalescer is made of glass fiber, right? This is completely useless