Dissertation > Excellent graduate degree dissertation topics show

Simulation Research on Spontaneous Combustion Law of Residual Coal in Goaf

Author: LinLiFeng
Tutor: JiaBaoShan
School: Liaoning Technical University
Course: Safety Technology and Engineering
Keywords: goaf spontaneous combustion“three-zone” oxidation of residual coal finite element method numerical simulation
CLC: TD752.2
Type: Master's thesis
Year: 2011
Downloads: 116
Quote: 0
Read: Download Dissertation

Abstract


Air leakage in goaf is an important cause that leads to spontaneous combustion of the residual coal, and the process of spontaneous combustion results from the coupling effect of seepage flow, gas species diffusion, temperature distribution, etc. Based on the "three-zone" division standard of spontaneous combustion in goaf, the "three-zone" distribution of spontaneous combustion in goaf is simulated adopting the combined measure of critical oxygen concentration and seepage flow rate, which provides theoretical references for prevention of spontaneous combustion in goaf.The coupling feild of seepage flow, air density and temperature distribution in goaf is simulated using the finite element methed. Then the influencing factors, such as different porosity models and different ventilation styles are analysed, which determines the simulation results and the "three-zone" division of spontaneous combustion in goaf. The results show that the width of spontaneous combustion zone is proportional to porosity and air leakage rate in goaf, and that the air leakage rates under the ventilation style W and U are less than that under the ventilation style Y and Z. The spontaneous combustion of residual coal in goaf could be prevented effectively through nitrogen injection to goaf or installation of goaf seal wall.According to the actual situation of serious air leakage on ground in Lianying Coal Mine, the effects of control measures, such as ground filling, nitrogen injeciong to goaf, pressre balance and installation of goaf seal wall are simulated respectively, which influencs the "three zone" division of spontaneous combustion in goaf of fully-mechanized Working Face 201. As result, the critical values of nitrogen injection volume after ground filling, balanced pressue and length of goaf seal wall are proposed, which provides important guidance for the effective and economical prevention of spontaneous combustion of the residual coal in goaf of Working Face 201.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study on Springback of High-Strength Steel Stamping,TG386
  3. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. Research on the Structure and Characteristics of Permanent Magnetic Coupling,TH139
  6. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  7. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  8. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  9. Simulation Analysis on Temperature Stress of RCC Arch Dam and Its Construction Joints Design Research,TV642.2
  10. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  11. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  12. Numerical Simulation of Biomass Direct Reburning,TK16
  13. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  14. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  15. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  16. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  17. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  18. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  19. Stability Analysis of Roller Compacted Concrete Gravity Dam Based on Time-history Method,TV642.2
  20. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  21. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3

CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine fire > Mine Fire > Internal fire and prevention
© 2012 www.DissertationTopic.Net  Mobile