Dissertation > Excellent graduate degree dissertation topics show

Research on Mathematical Model for Solidification Heat-transfer and Dynamic Control of Secondary Cooling in Continuous Casting of Round Billet

Author: WangShuiGen
Tutor: ChenDengFu
School: Chongqing University
Course: Metallurgical Engineering
Keywords: Continuous Casting of Round Billet Secondary Cooling Heat-transfer Simulation Dynamic Control
CLC: TF777
Type: Master's thesis
Year: 2010
Downloads: 268
Quote: 1
Read: Download Dissertation

Abstract


The secondary cooling technique plays a very important position during continuous casting. It influences the themal state of casting billet, then affects the formation of solidification structure. The disadvantages such as internal crack, center crack, segregation and strand drum, have association with irrelevancy secondary cooling process. A secondary cooling system should have proper caster structures and operating parameters, to satisfy the requirements of metallurgical criteria and uniform cooling.A two dimensional heat-transfer mathematical model in continuous casting of round billet was established according to a newly built cater in a steel plant in this paper. The model was solved by the changeable space FDM. The effective spraying water coefficient was determined according to the actual spray condition of round billet. The differences of circumferential cooling condition were considered, by changing the water flow density distribution tested on the plate to the distribution of water flow density for round billet.The software of secondary cooling simulation in round billet continuous casting (SSRBCC version1.0) was developed by Visual Basic, which has friendly interface, simple operation, strong interactive ability and functions of simulation of casting process, iterative calculation of cooling water, water formula regression and data post-processing.By simulation with the SSRBCC software and combination with the requirements of metallurgical criteria, the round billlet caster structures and operating parameters were designed auxiliary. The design of transition region and nozzle arrangement in the circumferential direction were analyzed. The proper secondary cooling system of steel 37Mn2 was confirmed by combination of the steel high temperature properties test and iterative calculation of cooling water by iterative adjustment were determined. After that, the influences of superheat, casting speed and cooling intensity on solidification of round billet (including billet temperature, liquid core length and all clotting time) were analyzed to explore the solidification law of round billet.For the non-steady process with changeable speed and casting temperature, a dynamic spray model for round billet was developed, with the function of real-time tracking (including fixed length blank tracking and fixed time interval tracking). In the model, the actual casting speed was replaced by the virtual casting speed of each zone, obtained by tracking as the parameter of water distribution and the influence of superheat on cooling water was considered. Comparing with the static spray control, the thermal state of billet was more stable to improve the quality and decrease the formation of crack by the dynamic spray control which adopted the virtual casting speed as the parameter of water distribution.By tracking the actual production after commissioning of caster, we found that the measured strand surface temperature was proper, gently decreased, the strand quality was controlled well, especially the cracks. The results show that the secondary cooling structure of the casting machine and the operating parameters are reasonably designed.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study of Interaction between Epoxy Molecules and Carbon Fiber Surface with Molecular Simulation,TB332
  3. Research on Mechanism Analysis and Modeling Simulation of Horizontal Well Tractor,P631.83
  4. Study on Springback of High-Strength Steel Stamping,TG386
  5. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  6. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  7. The Brake Performance of Hydraulic Retarder and Simualtion Research on Its Application for Aircraft Arrestment,TH137.331
  8. Satellite Attitude Determination Based on Gyro and Star Sensor,V448.2
  9. Study on Coupled Radiation-Phase Change Heat Transfer in Semi-Transparent Materials,V259
  10. Heat Transfer Performance of the Metallic Honeycomb and Regenerative Cooling Channel,V215.4
  11. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  12. Research on Orbital Control Method for Space Rendezvous and Docking,V526
  13. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  14. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  15. Single Neuron PID Control for Electro-Hydraulic Servo Unit of Ship Rudder,U666.152
  16. Simulation Analysis on Temperature Stress of RCC Arch Dam and Its Construction Joints Design Research,TV642.2
  17. Application of Additives’ Drag Reducing Technology in District Heating System,TU995
  18. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  19. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  20. Numerical Simulation of Biomass Direct Reburning,TK16
  21. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11

CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
© 2012 www.DissertationTopic.Net  Mobile