Slide valve differential pressure problem

The opening of the waiting valve is related to the pressure of the settler. If the settler pressure is high, the opening of the waiting valve will generally decrease. The settler pressure can be adjusted by a pneumatic press. The regeneration slide valve has a large opening in order to maintain a certain reaction temperature. The reaction temperature can also be adjusted by the dense phase temperature of the regenerator. Is it because too much external heat is taken, or the nature of the raw materials is relatively light, or the preheating temperature of the raw materials is low and other factors. This post was last edited by 176866346 on 2009-3-4 09:51 ]

1. The re-slide opening is related to the bed temperature, the driving force of the regeneration inclined tube, the fluidization condition of the inclined tube, etc. If the bed temperature is not too low, it may be that the overflow bucket in the regenerator is cracked or damaged, resulting in a decrease in the driving force of the inclined tube, or the inclined tube is loose and blocked, causing the regeneration slide valve to open too large and the pressure drop to decrease. 2. If there is coking and blockage in the inclined pipe to be cooked, or there is a problem with looseness, it may cause the sliding opening to be too large.

Your slide valve may be opened too large, resulting in low differential pressure. Adjust the operations of the two devices appropriately, such as pressure, temperature, heat intake, etc., close the slide valve and check again.

As everyone has said in most cases, in fact, the bulk density of the catalyst is also a problem, and the injection amount of backflush and loosening media here is not good if it is too large.

Thank you all. Now the regeneration pressure of my device is controlled at 0.29MPa, and the reaction pressure is controlled at 0.27MPa. The differential pressure between the two devices is about 20KPa. Originally, it was always controlled at about 30KPa. It was due to the problem of the waiting valve that the reaction pressure was increased accordingly. , but this is not the fundamental solution. I estimate that it is due to the blockage of all the loose points of the inclined pipe to be produced near the regenerator. Since the loose points are all blocked, the pushing force of the inclined pipe is small, resulting in poor discharge of the inclined pipe. The opening of the waiting valve is large, so the pressure drop of the waiting valve is low. It is also possible that the inside of the inclined pipe is coked, causing the inclined pipe to be unloaded smoothly, and the opening of the waiting valve is large, so the pressure drop of the waiting valve is low. I don’t know what your colleagues think! ! ?

You need to find ways to measure and calculate different pressure drops and perform pressure balance calculations, such as reaction pressure + stripping section pressure storage + waiting inclined pipe pressure storage - slide valve pressure drop = regeneration pressure + bed pressure storage. Only after accounting can we determine where the problem lies. Or it's an instrument measurement problem. The structure of your two devices shows that from the opening of the two slide valves, it should be running at full load. If the material level can be controlled stably, you can ignore it. However, the pressure accumulation of the two inclined pipes needs to be clear to determine whether the inclined pipes are in normal conveying condition. Sometimes the density inside the inclined tube is low, but it can also operate stably. In addition, the material level in the stripping section can be increased.

Whether there have been major adjustments to the operation recently, the nature of the raw materials, the slag ratio, whether the waste oil is recycled, etc. Personally, I think it is likely that the settler is coking, and fluctuations in operation will cause the coke blocks to fall and block the grate plate (large hole filter) at the inlet of the incline pipe to be cooked. This situation is very dangerous. The more coke blocks are blocked, the more the coke blocks are blocked, which will cause the incline tube to be unloaded smoothly, the material level of the settler will rise, and the pressure drop in the incline pipe and the slide valve to be evaporated will drop significantly. In severe cases, fluidization will be terminated and the work will be shut down.

Remember, the greater the opening, the lower the pressure drop.