The trays in the vent tower are constantly washed over
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The gas velocity inside the tower is very high; during each maintenance session, we find that the tray plates are severely damaged. Are there any measures that can be taken? Could some expert give us some advice? Thanks!
What kind of device is a vent tower? What is its main function? Is there no liquid-phase reflux? The gas flow rate can be appropriately reduced, or the gas load can be decreased, while maintaining a certain amount of reflux. If it cannot be adjusted, then recalculate to see if the gas and liquid phases are in equilibrium.
As for the specific circumstances of the work, it is only by considering the particular situation that one can determine what caused the problem and come up with the right solution
1. During shutdown, check the tray connectors to ensure they are firmly tightened. 2. Before initiating high-pressure air injection, establish a backflow in advance; during the injection process, control the amount of backflow and maintain a certain pressure to reduce the flow rate. 3. Control the amount of large-scale steam injection properly.
Are you referring to the coking vent tower?
Your vent tower maintains a certain amount of liquid phase reflux.
1. Control the rate. 2. Ensure a certain amount of reflux at the top of the tower during venting. 3. Reduce the heat load at the bottom of the tower slightly
1. Ensure sufficient liquid phase reflux; increase the reflux rate before initiating high-pressure steam injection. 2. The high volume of steam injected, along with the oil and gas present in the old tower, exceeds the capacity of the vent tower, rendering liquid phase reflux ineffective. 3. What is your processing capacity? What about the diameter of the coke tower?
If it really is the situation you described, in my opinion: first of all, the components inside the tower were not installed correctly during maintenance; the tray components were not fixed properly. If they had been installed as required, this kind of problem wouldn’t have occurred； Secondly, when you plan to increase the steam injection in your coke tower and switch it to the vent tower, establish the reflux in the vent tower in advance to ensure that the gas phase volume does not become excessive ； Thirdly, when increasing the amount of steam used for blowing, it is not increased to over 15 tons of steam all at once; this process happens gradually ； Fourth, it’s still an issue with your operators’ handling – they are working too fast.
If this is indeed the case, be careful with the operation; additionally, consider adding a baffle buffer tank before entering the tower to reduce the gas velocity!