The Technological Reconstruction Of The Shaft Sealing System For The Hydrogen Compressor Of Continuously Reforming Unit

Recycling hydrogen compressor K-201 is a key device in the continuouslyreforming unit of the project of Tianjin Petrochemical Corporation's 600kt/aContinuously Reforming Unit. Its shaft sealing system, original design being a floatingringseal, was beenfound that the sealingoil had been leakinginto technologygas. Then,the floating ring seal had been taken place by the oil-lubricated non-contacting spiralgroove mechanical face seal. The mechanical seal had been successively operated fornearly one year, but completely failed suddenly September, 2001, a great deal oflubricating oil leaking into the system. A decision has been made to reconstruct thesealing system completely by applying the dry gas seal to take place of the oil-lubricatednon-contacting spiral groove mechanical face seal. The results show that thisreconstructionisverysuccessful.This thesis presents a detail analyze concerning of the effects, of the theory and thetechnologyrelatedtothis reconstruction.The development ofthe shaft sealingsystem forthe hydrogen compressor has been reviewed. The fundamentals of spiral groovenon-contacting face seals have been analyzed, paying more attention to the mainparameters. As to the reconstruction plan, a detailed technological reasoning has beencarried out. Adetail performance calculation as to the selected herringbone seal face hasbeen made,compared to the common spiral groove seal face. The results show that theherringbone seal face has much greater gas film stiffness than that of spiral groove sealface.This thesis presents a detail technological summing-up as to the dry gas sealreconstruction of the hydrogen compressor K-201 in Tianjin Petrochemical Corporation.The conclusions and experiences from the thesis can be used for reference in the similargassealreconstructionproject.