Have you ever experienced water in crude gasoline? Is there any way to reduce the water in crude gasoline?
Thread Content
The naphtha in my installation was severely water-contaminated. In the past, salt formation occurred in the absorption tower. I don’t know if there is any relationship between the two.； Also, I think the structure of the oil-gas separator in our installation is unreasonable. The residence time of oil and water is short, and water and oil are pumped out without good separation. I want to see the structure of catalytic oil and gas separators in other units. I hope you can support me. Thank you.
Will the oil-water interface control fail? Try setting the boundary lower.
Where is the water extracted from the oil and gas separator at the top of your fractionation tower sent? If you are going to absorb and stabilize the system for rich gas water washing, it is recommended that you control the interface of the oil and gas separator lower. Even if there is no interface to drain the oil, the stabilized condensed oil tank can still be separated.
I agree with what you said above. If you want to make washing water, just lower the boundary level. I think that the salt formation in the absorption tower has nothing to do with the water in the crude gasoline. On the contrary, if the salt in the absorption tower plate is salted, a large amount of water in the crude gasoline can also play a role in washing the tower.
The water level is too high. "The structure of the oil-gas separator is unreasonable. The residence time of oil and water is short, and water and oil are pumped out without good separation. ”It is also possible that the temperature of the fractionating tower is too low.
We have also experienced this phenomenon here. Later, we lengthened the dehydration bag and now the effect is okay.
The oil and gas separator relies on the water separation bag to separate oil and water. If the boundary level is controlled lower and the liquid level fluctuation is avoided as much as possible, it should not be a big problem.
Control the low point of the on-site glass plate.
The interface of the oil and gas separator should be lowered.
My installation is located in the north. Originally, the oil and gas separator water hopper was heated by steam, which caused the water in the water hopper to boil, disrupting the accurate measurement of the interface, causing the oil-water interface to be unclear, and the crude gasoline to be seriously contaminated with water. Generally, if it is a simple instrument problem, it will not be difficult to solve. My post is just a suggestion to the poster, please think more about it from other aspects.
Control the interface level of the oil and gas separator as low as possible, but the oil in the separator cannot be drained away. It is recommended to replace it with a useful instrument, so that the interface level is more accurate and easy to operate. I have seen the oil and gas separator in our factory. It is a dehydration bag, an anti-vortex plate, and a wiping net.
The oil and gas separator at the top of the fractionation tower does not have any special structure. Besides, gasoline and water should be easily separated, and it does not require a long separation time. The most likely reason is that the interface is out of order and is too high. As for the salt formation in the absorption tower, I think it may be related to the water in the crude gasoline.
First of all, salt formation has nothing to do with water in crude gasoline.； Secondly, if you are afraid of it, you can increase the settling time of the separation tank at the top of the fractionation tower. ； Third, you can add a deaerated water pipeline in the middle of the absorption section and return to the tower for cleaning. The effect is not bad, and we have tried it.
Strengthen the precipitation of crude gasoline. If crude gasoline cannot emulsify with water, you can try adding some emulsifier.
1. Adjust the boundary level 2. Reduce water injection at the top of the tower without affecting it 3. Reduce reaction steam injection 4. The overall liquid level of the separator should not be too high
The effect of the oil and gas separator at the top of the fractionation tower is not very good, and the boundary level control is a little lower.
Is there a sustained-release agent added to the fractionating tower? Whether the extraction outlet is 30cm higher than the bottom of the tank. The boundary position can be lowered, but I don't think this is the main reason. The high temperature after the rich gas is cooled will also have an impact, as will the location of the rich gas inlet. I suggest you reanalyze it.
Reasons why gasoline contains water: 1. Water cooler leaks ； 2. The water bag boundary is too high or the boundary level meter fails. ； 3. Internal leakage of the purge steam valve (it is recommended to use a blind plate for isolation) ； 4. The raw materials contain water ； 5. Bottom temperature at the top of the tower ； 6. The gasoline stays in the tank for a short time and is not separated in time (it is recommended to add a partition).