Large Centrifugal Compressor Sealing Technology

Along with the fast development of science and petrochemical industry, various compressor has been applyed widely. However seal technique is still vital in some working conditions especial in the case of high pressure, combustible, explosive and poisonous conditions. If happened accident, it will bring huge economic damage due to stopping the production, even endanger the worker's life. Our factory has long history with excellent traditions. It's our persistent tenet that keeping device working well, fully, safely, steadyly, permanently. With this purpose, this paper researches the state of dometic and overseas seal technique; uses other enterprise's successful experiments for reference; combines the factory set's structural property, technics characteristic and the different request of medium leakage degree; considers the respective strongpoints of floating ring seal, conical floating seal, suction labyrinth seal, inflator labyrinth seal, mechanical seal, dry gas seal; finds out the optimum, dependable seal techinique fiting for each set on the base of entire analysis on the centrifugal compressor. And in the end by putting this plan into practice the factory achieves localized reconstructs, reduces the production cost and fulfils the demands of secular safe use. It brings remarkable economic results and social beneficial results.this paper's research focuses on the following aspects:1) Aerial compressor reconstruction with float hoop seal: solving the problems of severe abrasion of labyrinth seal, medium contamination of seal oil and seal oil leakage to the lubricating oil system.2) Research on conical float seal of centrifugal copressor: the conical float seal technique is applied in the circle hydrogen compressors of diesel oil hydrogenation device which have 800 thousand tons output. By the analysis of its seal mechanism, the technique of conical float seal is applied masterly to solve the problems in the practice.3) Aerial compressor reconstruction with inflator labyrinth seal: the aerial compressor formerly adopted simple inflator labyrinth seal and it didn't work well due to the vast leakage and frequently abrasion of the labyrinth seal, so the machine couldn't operate in long term. By the use of the combination of suction labyrinth seal and inflator labyrinth seal and advanced materials, the machine gains long term operation.4) Aerial compressor localization of import machenical seal: the localization reconstruction reduces the cost of import expense of original U.S. device.5) Research of circle hydrogen compressor with dry air seal.