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Hydrogenation catalyst slurry pump mechanical seal failure analysis and improvement


Obvious signs of ring wear surface. (3) seal cavity of a catalyst. (4), ring spring is the catalyst catching and spring failure, loss of compensation. 3.2 Failure Analysis (1) catalyst mixture while stocks closed after the washing machine with water, but can not be washed very clean, stop the pump, the catalyst inevitably deposited in the sealed chamber, so that the gap ring and sleeve was the catalyst block, and ring spring is catching catalyst,[link widoczny dla zalogowanych], resulting in the amount of axial adjustment is not enough, causing the sealing surface is not a good fit between, the occurrence of microleakage. After the catalyst particles into the sealing face, further exacerbated the end of the wear and tear, resulting in an increase of leakage, eventually leading to mechanical seal failure. (2) The pump is intermittent operation. V-202II trough is relatively small, with very easy to put the trough of the pump to send air, time is about l5 ~ 2O minutes. At this time, once the operators have to conduct other operations to be sent empty prone to trough, the pump is still running, Zhao Yanfei: hydrogenation catalyst slurry pump mechanical seal mechanical seal cause analysis and improvement of dry grinding,[link widoczny dla zalogowanych], mechanical seal moment of failure. This situation occurred in the actual operation several times. 3.3 Improvement of mechanical seal flushing 3.3.1 changes. Figure 2: A \mixed with liquid. The new fluid in the sealed chamber to win the title to reach the impeller washing machine at the end, and then the mixture along with other impeller sent. so that you can maintain the mechanical seal at the pure liquid, the catalyst precipitation phenomena no longer occur. 3 .3.2 change the static ring material from the stationary ring of the graphite to silicon carbide materials, such action (on the next page 107) are the stationary ring silicon carbide material. Silicon carbide has good wear resistance and corrosion resistance ,[link widoczny dla zalogowanych], causing the catalyst is difficult to wear. 3.3.3 Auxiliary material change to the service ring Viton seals use outsourcing PTFE O-ring material, corrosion resistance and good flexibility. 3-3.4 to change the pump operation steps shown in Figure 2, open the pump before opening the valve A, then steps to start the pump. stop the pump,[link widoczny dla zalogowanych], the first stop the pump, and then let the rinse fluid sealing the sealed chamber 5 to 10 minutes and then close the valve A. This operation is to prevent the catalyst deposited on the seal cavity, and can prevent the mechanical seal dry grinding. because even if the trough was sent to space, there are still lubricated mechanical seal flushing fluid will not dry mill closure. 4, the mechanical effect of modified Since the seal flushing system in operation since the mechanical seal has been stable operation for 10 months. transformation is very successful, monthly savings of about 4 sets of sealing machine, greatly reducing maintenance costs.
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