What are the reasons for coking in the large gas line from the coking coke tower to the distillation tower?
Thread Content
What are the reasons for coking in the large gas line from the coking coke tower to the distillation tower? Ours becomes very thick in less than half a year.
Control the amount of quench oil carefully; the temperature at the top of the coke tower must not exceed 420 degrees. We conducted maintenance by inspecting the large elbow at the top of the coke tower, and almost no coking was found.
It is important to ensure the stable operation of the coke tower; factors such as the method of injecting quench oil, the medium chosen, and the injection time are all crucial, and it is necessary to investigate each cause one by one.
The defoamer can only be turned off after vigorous aeration – has the team followed this procedure strictly? The quench oil for the old tower should be switched in only after the temperature of the new tower reaches the operating temperature; otherwise, the top temperature of the old tower may exceed the operating temperature, leading to coking. The amount of steam supplied to the small steam injection chamber should not be too high, as otherwise excessive flow rates can cause problems with the tower operation
Coking? Where does heat come from? Why does coking occur? After the coking tower is cut off, the pressure in the old tower drops, which makes it easy for foam to be entrained, carrying coke powder into the pipelines and the distillation tower. 2. During the coking process, control the temperature at the top of the coke tower properly, and inject quench oil (wax oil is preferred) at the right time and in the right amount. After cutting off 3 cutters, the old tower defoamer and quench oil should have their supply stopped at a time determined based on the actual temperature at the tower top. 4. Changes in the outlet temperature of the heating furnace, and steam injection into the furnace tubes. 5. Steam flow rate during chattering; coking height in the coke tower, and pressure at the top of the coke tower. 8 Search on Baidu