Weekly topic on refining knowledge (technology): How to resolve blockages in the water drainage line of the coker tower? Issue 16, May 29–June 4, 2011
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This post was last edited by lijianhuai on 2011-5-27 09:46. The weekly topic discussion sessions in the refining area welcome active participation from everyone, and we hope that you will come up with more valuable topics. Please do not hide your reply to this question: How to resolve blockages in the water discharge line of the coke tower? Some people say that adding a drain line filter would help, but the filter gets clogged frequently – how can this be resolved? Currently, the raw materials used in coking processing are almost at a level of 1. Adding water not only carries coke dust particles but also viscous oils that are heavier than water. Once these substances enter the cold and hot coke water tanks, they can cause blockages in the filters at the inlets of the cold and hot coke water pumps, leading to pump failure and delays in production. If this water is released into the coke pit, these viscous oils will accumulate at the outlet of the lifting pumps, preventing them from functioning properly. In such a situation, coke removal becomes impossible. What should be done to solve this problem in the long term? For information on the hot and cold scorch water tanks, please refer to the maintenance diagram I took: http://bbs.hcbbs.com/thread-828598-1-1.html
This post was last edited by linweihua6 on 2011-5-27 08:32: 1. Start the cold focus water pump for flushing； 2. Push with steam ； 3. Steam pressure at the top of the coke tower ； 4. There is no other choice but to remove the bottom cover and drain water into the coke tank; however, it is important to first loosen the bolts on the side of the coke tank corresponding to the bottom cover, be careful not to loosen the bolts too much, and control the rate at which water is drained ； 5. Strengthen the removal of sticky oil within the system, and regularly replace the cold coke water
Regularly clean the pipelines with steam!
The purpose of supplying water to the vent line is to ensure that the pipeline from the main feedwater valve to the main valve of the old tower’s vertical pipe is filled with water, thereby preparing for the subsequent shutdown of steam supply and ensuring successful feedwater supply. This prevents oil accumulation from causing clogging at the center of the coke tower due to false feedwater supply. Reasons for the blockage of the water discharge line: (1) The breather valve is not open; (2) Improper cooling of the feedwater leads to collapse, blocking the channels for coke formation; (3) The pipelines at the bottom of the tower are blocked by coke particles; (4) The channels for coke formation are blocked by sticky oil. Solution: 1 Use steam to purge the water discharge line. 2 Start by slowing down the water flow rate appropriately. 3 Open the breather valve. 4 Strictly control the cold coke temperature.
Reply to 1# lijianhuai: I haven’t come across what the moderator mentioned; these are just some minor suggestions for reference only. The water can first be pre-treated in a tank, where most of the coke particles and tar are removed.
I think the most direct and effective method is to close the oil cut-off valve, open the feed water and steam supply valves as well as the drain valve, and start the feed water pump to flush the pipes to resolve the issue! It is recommended that when draining water from the coke tower, the drain valve not be opened fully at once; it should be opened in stages to prevent a large amount of coke particles from entering the drainage line and causing further blockages
Everyone’s methods are more or less the same; they’re basically sufficient to solve the problem of poor water flow
First, determine roughly based on the actual situation whether it is caused by sticky oil buildup or coke blockage; in the case of sticky oil buildup, it is advisable to use steam to clear it first. For coke blockage, it is best to identify the approximate location of the blockage so that a targeted solution can be applied. If there is a blockage at the water discharge flow meter, it should be removed for repair; if that’s not possible, the bottom cover must be opened to force the water out