Problems with the cold quench water pump
Thread Content
The outlet flow rate of the cold coke water pump in my company is 350 cubic meters per hour; the pipe diameter at the outlet changes from DN80 to DN250. Since the pump started operating, there have been too many instances of seal leakage, and multiple sets of seals have had to be replaced. The gap between the shaft and the sleeve is increasing rapidly, and the sleeve is severely worn. Please help analyze the factors contributing to this issue. If you need any data from me, I will provide it.
There are many reasons for seal leakage; for coking water pumps, these include frequent start-stop operations that result in large pressure changes, significant variations in operating parameters, and potential issues with the installation.
It is necessary to consider the status of the cold coke water filter, as well as the process of the cold coke water circulation. Ensure that no coke dust is carried along, and that there is enough time for the cold coke water to settle (generally, one tank should be used for adding water while another is used to collect it). It’s a guess, for reference only!
Excessive diameter variation can lead to a decline in the pump’s performance
Our cold coke water pump mechanical seals have a dedicated fresh water flushing line; we’re not sure what kind of system you have.
I believe the pump’s original design specified a flow rate that is too high; due to the requirements of the process operations, it may need to operate at a lower flow rate for extended periods of time. Using a pump with excessive capacity for such tasks is the main cause of cavitation-induced vibration in this pump. In particular, when the feed water flow rate increases rapidly from a low level to a high level, it can cause significant fluctuations in the pump’s operation, and leakage may occur. The best solution is to adjust the operating frequency, as this not only saves electricity but also reduces maintenance costs, resulting in smoother operation.