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Explosive engineering

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Explosive engineering

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Explosive engineering

  1. 1. Explosive Engineering Topic of presentation Aluminum powder influence on ANFO detonation parameters Group Members • 2012-min-07 • 2012-min-39
  2. 2. Contents What is ANFO What is aluminized ANFO Influence of aluminum powder on ANFO parameters Conclusion Q&A
  3. 3. What is ANFO • Blasting agent • Introduced in mid 1950s • Formation
  4. 4. Properties of ANFO Names of properties ANFO properties stability at ambient temperature Combustion Strong supporter Flammability Not flammable Nature Oxidizer
  5. 5. Aluminized ANFO 6NH4NO3 + CH2 + 2Al = Al2O3 + 6N2 + 13H2O + CO2
  6. 6. Influence of Al powder on ANFO
  7. 7. Influence on toxic gases ANFO-AL-1(WT%) ANFO-AL-2(WT%) ANFO-AL-3(WT%) 91.85 88.71 85.23 3.64 7.27 12.12 4.51 4.02 2.65 Explosive Components Porous AN Flacked Al Oil Flex 401 Explosive Amount (kg) NO2 (1/kg) CO(1/kg) ANFO-AL-1 0.550 5.22 5.53 ANFO-AL-2 0.550 3.75 8.67 ANFO-AL-3 0.550 0.93 7.43
  8. 8. Influence on work ability • Impulse density= Impulse/A • Impulse= F.t • I.D= mv/A = F.t/A • A= square surface of propelling probe • W= charge mass (kg) • M= mass of probe • V= velocity • T= time
  9. 9. Influence on blast wave performance • Voltage induces in sensors ∞ Pressure of Blast Wave Parameters Unit 137A21 137A22 Range Mpa 0-34.50 3-34.50 Resolution Kpa 0-0.69 3-0.69 Sensitivity mv/ kPa 0.145 1.45 Frequency kHz 500 500
  10. 10. Influence on energy Ammonium nitrate(%) Fuel oil(%) Effect Toxic gas Energy (kcal/kg) 92 8 Oxygen deficiency CO 810 96.6 3.4 Oxygen excess NO2 600 94.5 5.5 Ideal reaction No toxic gas 930 Ammonium nitrate(%) Fuel oil(%) Aluminum powder Energy (kcal/kg) 87.6 2.5 9.9 1320
  11. 11. Conclusion Increase the energy Decrease the toxic gases Increase work ability Enhance the blast wave performance
  12. 12. Questions ?

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