May I ask how is the oil-water separation in the overhead oil-water separator of the delayed coking unit? Will adding a demulsifier work?
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May I ask how is the oil-water separation in the overhead oil-water separator of the delayed coking unit? Will adding a demulsifier work?
There is almost no oil in the oil-water separation tank at the top of the vent tower; when separation is not effective, it can be sent to the cold coke water system for reuse without any problem, and there is no need to use demulsifiers
The oil-water separation performance of our facility is not very good; the oil-containing waste is generally discharged into the sewer system or sent to oil sludge tanks. When it goes into the sewer system, the oil content tends to exceed the allowed limits, while when it ends up in the oil sludge tanks, there is a high amount of water present. Currently, a new facility with a capacity of 1.2 million tons is being built, and there will be dedicated areas for treating oil sludge and acidic water. It’s uncertain what the results will be once this facility is in operation; we hope that everyone can share their good experiences.
Our units are basically installed in the cold coke water system; by increasing the oil level at the tops of the cold and hot water tanks, it is transferred to the sludge oil tank for further treatment. Since the oil content is low, there is little point in sending it out directly
Our plant uses the oil-water separation tank at the top of the vent tower to send the oil above the specified level to the oil product storage area, where it is settled and dehydrated before being reused in refining. . . . It’s a good idea, but the emulsification of oil in this mixture is too severe; oil and water basically can’t be separated, which results in a significant amount of water ending up in the raw oil tank. . .
The oil-water separation tank at the top of the vent tower sends the oil above the specified level to the product storage area where it is allowed to settle and lose water before being reused in refining processes. An emergency tank is installed in the heavy oil storage area, allowing oily waste with severe emulsification to be sent there for forced dehydration. The measures are as follows: heat the tank containing the accident material at high temperature, add an appropriate demulsifier evenly into it; a mixer can be used or a pump can be employed for circulation to ensure even mixing, after which the temperature is lowered and the mixture is left to stand for 5–10 hours to facilitate dehydration. The remaining oil in the tank is pumped back or fed into the raw material reprocessing process.
There’s no need to use a demulsifier; the separation is excellent, though it contains some coke fractions
We have installed two separate cold coke water sedimentation tanks with a capacity of 3,000 cubic meters each; after sedimentation, the liquid is recovered and sent to the crude oil tank area for further processing, and the results are fairly good.
In our design, the separated dirty oil can be sent either to the dirty oil tank or to the heavy dirty oil outlet device, while the separated water is sent to the sewage stripping unit. Is there any device similar to ours? How would it work if used in the same way?
Is it better to use this deaerated water to increase energy consumption, or to send it directly to the cold coking water tank for cooling the coke?
An demulsifier should be added, as it facilitates the separation of oil and water.