What are the reasons for the wear of the mechanical seal (dynamic seal) in a reaction vessel?
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The mechanical seals (moving parts) made of aluminum alloy in the enamel-lined reaction vessels of our company tend to wear out frequently. What are the possible reasons for this? The reaction vessels are installed correctly, without any deviations.
If you say that the installation is fine, then it’s caused by an unbalanced rotation of the impeller. I’m not sure what medium is being used; is it steam or something similar? Also, are there any inlets and outlets right at the location of the impeller?
Is the sealing surface material of the mechanical seal alumina ceramic? It would be best for LZ to specify exactly which parts of the aluminum alloy are constantly being worn; in the case of mechanical seals, it is usually only their sealing surfaces that move relative to each other. The main reasons for early wear of the sealing surface are as follows: 1. Improper selection of the sealing surface material, which should be chosen based on factors such as the pressure and temperature of the medium ； 2. The seal flushing fluid is insufficient or contains impurities; there are specific requirements regarding the pressure, flow rate, and purity of this fluid ； 3. The installation quality of the mechanical seal is poor, and the pre-tightening force of the seal surface is too high ； 4. Excessive shaft runout of the stirrer in the reaction vessel ； 5. Quality issues in mechanical seal manufacturing. The above opinions are for reference only: lol
The worn area is the contact point between the dynamic seal and the static seal
The pot is under negative pressure to create a vacuum; several different seals were tried, but the problem persisted. There is also no issue with the \"excessive shaft vibration\" of the reactor’s stirrer
The worn areas are the contact points between the dynamic seal and the static seal: 1. The installation clearance of the bottom bearing – could it be that wear on the bottom bearing has increased this clearance, thereby affecting the performance of the shaft seal? 2. Lubrication and flushing of mechanical seals: It is necessary to analyze the flushing scheme for your mechanical seals. The medium that the seal in the reactor is designed to seal is a gas-liquid mixture, and it cannot rely on the medium itself for lubrication; therefore, analysis should focus on this aspect. At the same time, looking forward to the original poster’s results
It’s also possible that it has entered the solid particles
The reactor needs to be designed with a vacuum environment; if the back pressure on the static and dynamic rings is too high, it’s better to use a balanced type