Application Research Of Steam Blocking Sealing Used In Coking Rich Centrifugal Compressor

1.4Mton/Y Coker equipment of Shengli Refinery, Qilu branch, Sinopec, started to build in April 2003. It still works well on Mar.10, 2004. The Coking Rich Gas Centrifugal Compressor (NO. 2MCL458-6) was made by Shenyang Blower Plant. It is adopted with the technology of Italien Nuovo Pignone, which is used in this coker equipment. This compressor is a kind of centrifugal oil gas compressor with 2 segmented, 8 staged, horizontal dissected and intercooling. When this plant unit was ordered, according to the practical situation and related processing parameter, we analyzed its shaft end sealing type and decided to adopt the technical proposal of steam blockage sealing.In reformed proposal, the material and interstice between every stage was determined according to theoretical and practical analysis, structural parameter and size of shaft end sealing. After assembly and checking, we found that the interstice of every part conforms to sealing requirement. With the principle of reasonable and looking-well, according to the situation of the actual work site, we confirmed the design and assembly of pipelines for sealing accessory system. After assembly was completed, the pipelines were swept and blown clean and evacuation was tested, it met the standard of related technical requirement. The operation proposal was determined according to sealing structure and actual operation situation. Operators were guided to work in steady processing under variant status such as running, stopping or normal operation. This plant unit ran successfully at the first start on Mar. 8, 2004. The sealing ran well with 0 leakage at shaft end. Sealing rebuilt was successful.The coking rich gas centrifugal compressor, which adopted steam blocking sealing technique was testified successfully. Until now it has been working steady for about 7 months. The sealing has reached the standard of technical requirement for 0 leakage. Reliable sealing is not only secure a long period of safe operation, but also gains more economic effect.