Rotor Axial Displacement Fault Self-Recovering Regulation And Rotating Sealling Improvement For Better Efficiency

Based on the principles of Fault Self-Recovering (FSR) for complex mechanical system, and aiming at the solutions of problems, which are existing during operation of high-pressure centrifugal compressors, such as the interlock shutdown of the whole set of processing facilities caused by rotor's excessive axial displacement, and the lower energy-efficiency caused by large internal leakage through the balance drum seal, in this dissertation an axial displacement fault self-recovering system and a balance drum sealing improvement are presented, systematically analyzed and demonstrated. These studies could solve the above two important problems and provide theoretical and technical foundations for processing facilities to work with longer cycles and higher energy-efficiency.High-pressure centrifugal compressor is the key device in most process industries. Its reliability is the controlling factor for the reliability of the whole set of processing facilities to continuously work with long period. And also, its energy- efficiency is the determinative factor of product cost because of its high-energy consumption ratio. In 1960's, equipment monitoring and diagnosing technologies were developed, and prognoses maintenance and intelligent maintenance were introduced into industry use. Interlock emergency shutdown was widely used. The non-planned emergency shutdown of processing facilities caused by a fault in an individual machine will result in heavy economic loss and environment pollution. Moreover, when a machine is shutdown, most important dynamic information disappears resulting in big difficulties in fault diagnosis and fault recovery. Also, after an emergency shutdown, new fault may emerge during the next start-up.However, based on the principles of FSR, many machine faults can be cured without the necessity to shutdown the machine. As for the conditions under which a rotor axial displacement fault will develop in a centrifugal compressor, it is pointed out in this dissertation that it is the dynamic change...