Which process is more reasonable for delayed coking shutdown and oil withdrawal?
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Question 1: There are generally two processes available when the delayed coking plan is shut down, 1: The exit of the coking furnace goes to the coke tower and the tower feed line, to the top of the coke, to the bottom of the coke tower, to the oil rejection tank, to the oil rejection pump, to the oil rejection water tank, and out of the device. 2: The outlet of the coking oven goes to the coke tower upper tower feed line, to the large oil and gas line, to the fractionation tower, to the radiation pump, and all the way to the outlet of the on/off pump, to the oil dump water tank, and out of the device. Which of the above two processes is more reasonable? Question 2: There are generally three processes available during emergency shutdown of delayed coking, 1: The exit of the coking furnace goes to the coke tower and the tower feed line, to the top of the coke, to the bottom of the coke tower, to the oil rejection tank, to the oil rejection pump, to the oil rejection water tank, and out of the device. 2: The outlet of the coking oven goes to the coke tower upper tower feed line, to the large oil and gas line, to the fractionation tower, to the radiation pump, to the outlet of the start and stop pump, to the oil dump water tank, and out of the device. Which of the above two processes is more reasonable? 3: The exit of the coking oven goes to the coke tower upper tower feed line, to the emergency oil dump line, to the oil dump water tank, and out of the device. Which of the above three processes is more reasonable? What will happen if there are no empty towers? Please discuss with Haiyou?
Question 1: It is more reasonable to adopt process 1. Question 2: If there is an empty tower during emergency shutdown, use process 1. If there is no empty tower, the four-way valve is cut to the emergency shutdown line to the oil dump tank.
For Questions 1 and 2, it is more reasonable to use process 1. Process 2 can easily cause coking in the fractionation system. Even if there is no empty tower, it should be put into the oil dump tank, and try not to let the oil dump tank store oil for a long time (the oil temperature is high and coking may occur)
I agree with the first option... Large oil and gas lines should not use heavy oil... I agree with the opinion above. :lol
Delayed coking process available during planned shutdowns: The outlet of the coking oven goes to the coke tower upper tower feeding line, to the oil dump tank, to the oil dump pump, to the oil dump water tank, and out of the device. ； The simpler it is to remove oil during shutdown, the better to reduce heavy oil pollution. ； If there is no upper tower feeding to the oil dump tank line, it is recommended to add more ；
Everyone generally uses this process: The exit of the coking furnace goes to the coke tower and the tower feed line, to the top of the coke, to the bottom of the coke tower, to the oil rejection tank, to the oil rejection pump, to the oil rejection water tank, and out of the device. Question 2 is still the first method. If there is no empty tower, use the emergency pressure relief line at the furnace outlet and the decontamination oil line out of the device.
For question 1, it is better to use the first method for planned shutdown. For question 2, the first method is also better, but it is also faster to use 2 in emergency situations. When there are no empty towers, the only choice is the second method. There is another very important point: If there is a power outage in the whole plant, whether there is an empty tower or not, the furnace tube should be opened as soon as possible to inject steam, and the remaining steam pressure should be used to purge the furnace tube with all its strength to blow sticky oil directly into the production tower to minimize coking of the furnace tube. Because the cooling of the furnace requires a process that leaves no time for unnecessary operations, protecting the furnace tubes from coking is the top priority.
The residual pressure of steam can sweep away the oil in the furnace tube. However, without excess steam, will the coke hole be blocked in the coke tower, which will result in no way to cold coke? If there is really no steam for small and large blowing, what should be done? Can cold coking be carried out without blowing steam? Looking forward to it. Does anyone have this experience? Thanks.
Of course, the first method is better. I have never seen the second process you mentioned. Can the feed to the coke tower not enter the tower but only go through the large oil and gas line?
Reply 10# szqqqt It’s all a self-modified process. I’ve seen a few sets of devices that are rarely useful.