Explosive engineering

1. Explosive Engineering
Topic of presentation
Aluminum powder influence on ANFO detonation parameters
Group Members
• 2012-min-07
• 2012-min-39

2. Contents
What is ANFO
What is aluminized ANFO
Influence of aluminum powder on ANFO parameters
Conclusion
Q&A

3. What is ANFO
• Blasting agent
• Introduced in mid 1950s
• Formation

4. Properties of ANFO
Names of properties ANFO properties
stability at ambient
temperature
Combustion Strong supporter
Flammability Not flammable
Nature Oxidizer

5. Aluminized ANFO
6NH4NO3 + CH2 + 2Al = Al2O3 + 6N2 + 13H2O + CO2

6. Influence of Al powder on ANFO

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. 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. 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. 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. Conclusion
Increase the energy
Decrease the toxic gases
Increase work ability
Enhance the blast wave performance

12. Questions ?