Sealing issues with the catalytic slurry pump
Thread Content
Dear teacher: The bottom slurry pump used in catalytic cracking currently employs diesel as the seal fluid for the mechanical seal. In light of current energy-saving efforts, is there any alternative to using diesel for this purpose? Thank you! !
Yes, the Calit oil pump does not use sealing oil (diesel) as the mechanical seal; instead, it uses a separate sealing oil tank, with lubricating oil as the medium.
Changing the form of the sealing oil also requires changing the type of mechanical seal. In certain operating conditions, many different mechanical seals can be used, but for a given mechanical seal, there is only one flushing scheme that is most suitable! What LZ is referring to must be the PLAN32 scheme! What was mentioned upstairs should be the PLAN52 or LAN53 solution!
The slurry at the bottom of the fractionation tower in catalytic cracking units contains catalyst, which can easily cause damage to mechanical seals. Therefore, many manufacturers use diesel as an injection-based flushing fluid for these seals; this is done to remove the heat generated by friction on the seal surfaces, as well as to wash away the catalyst that enters the seal chamber, thereby extending the service life of the mechanical seals. When double-end or tandem mechanical seals are used, the flushing method that employs lubricating oil as a cooling medium is a circulating flushing method. The flushing fluid (i.e., the seal oil) serves only to cool and remove heat, without taking into account its impact on the catalyst within the internal seal.