Dissertation > Excellent graduate degree dissertation topics show

Study on the Sealing of Top Gas Pressure Recovery Turbine

Author: XieHongXing
Tutor: TanYuanQiang
School: Xiangtan University
Course: Mechanical Engineering
Keywords: Turbomachinery Seal Energy dissipation TRT
CLC: TB42
Type: Master's thesis
Year: 2013
Downloads: 6
Quote: 0
Read: Download Dissertation

Abstract


With the development of modern industry, energy-saving and safety of the turbomachinery become more and more prominent. The leakage of working medium not only leads to energy waste and environmental pollution, but also seriously affects the stability operation of turbomachinery. Therefore, sealing technology becomes one of important research topics for turbomachinery. More, turbomachinery is the core equipment in the field of aerospace, and has raised higher demand on sealing performance. In this thesis, the developments and the mechanisms of various types of sealing technology are introduced. The performances of labyrinth seal and honeycomb seal which are widely used in the high-performance turbomachinery are compared and analyzed by numerical simulation and engineering practice.Numerical simulation is a powerful tool to study internal flow field of turbomachinery. Three dimensional labyrinth seal and the honeycomb seal structures and meshes are constructed. The internal flows of labyrinth seal and honeycomb seal are numerically simulated using commercial CFD software FLUENT, and the essential of the flows are analyzed in detail. The excitation of honeycomb seal is revealed, and labyrinth seal and honeycomb seal leakage are also calculated. From the viewpoint of structure and energy dissipation, the advantages of the honeycomb seal are explained. According to the structural parameters of honeycomb seal, such as seal clearance, size of honeycomb depth and core, the influences of these parameters on the internal flow field are studied. Further, the influences from the vortex formation in honeycomb cavity, gas energy dissipation on the performance of honeycomb seal are investigated.Top gas pressure recovery turbine (TRT) is recognized as a highly valuable secondary energy recovery process in industry. So, studying its sealing characteristics is of theoretical and practical significance. This thesis takes the shaft end seal structure of original2#TRT from Hunan Valin Xiangtan Iron and Steel as an example, investigates the failure of its sealing in detail. Keeping the original rotor structure and sealing system unchanged, gas film face seal and honeycomb seal which is made of Hastelloy-X take the place of the original carbon ring seal and labyrinth seal. The results show that the shaft end seal structure has a longer working life, better sealing effect, reduced dosage after such retrofit, and the stability and efficiency of the whole system are improved remarkably.

Related Dissertations

  1. Researches and Application on PKI and Digital Watermarking in the Electronic Seal System,TP309.7
  2. Document Transmission System Design and Implement Based on Java EE Framework,TP311.52
  3. Simulation Analysis and Improvement Study on Centrifugal Pump’s Key Structure,TH311
  4. Simulation Analysis and Experimental Study on Hysteretic Behavior of High-performance Shear Panel Damper,TU352.1
  5. Blast distributed coordination with TRT device control method,TP273
  6. Design and Researh on TRT Control System of 1350m~3 Balst Furnace,TF325.65
  7. Research on the Technical of Failure Diagnosis in TRT Based on Neural Network,TH165.3
  8. Study on the Effect of Correlative Parameters on the Flow Pattern and Energy Dissipation in the Batch High-shear Mixers,TQ051.71
  9. Study of nonlinear dynamic labyrinth seal gas,TH136
  10. Research on the Image Extraction and Registration Method of Round Seals,TP391.41
  11. The Technical Standardization Research of Steel-Rubber Friction Energy Dissipation System,TU352.1
  12. The Research and Application of Dry Gas Seal Technique Reform of the Horizontal Centrifugal Machine,TB42
  13. Drip emitter flow field dissipation studies with gas-liquid flow pattern,S277.95
  14. The Art of Carving Up. the China Performance,J292.4
  15. Study on the Coherence with Qin and Han Dynasties in Seal-cutting,J292.4
  16. Research on Official Seal Identification,TP391.41
  17. Appraise Method and Application of Fault Lateral Seal Ability,P618.13
  18. The blast furnace based on fuzzy PID pressure control system development and industrial applications,TP273.4
  19. On Stability Control Method for the TOP Gas Pressure of Blast Furnace Based on TRT System,TF543
  20. Critical Opening Characteristics of a Laser Surface Texture Gas Mechanical Seal,TG665
  21. Research on Measurement Technology of Parameters of Piston Ring Based on CCD,TG806

CLC: > Industrial Technology > General industrial technology > Industrial common technology and equipment > Sealing technology
© 2012 www.DissertationTopic.Net  Mobile