R. Meyer J. Köhler A. Homburg Explosives

Thermodynamic Calculation of Decomposition Reactions
CO2: 8.19
H2O: 20.24
N2: 9.37
O2: 0.39
sum: 38.19 V22.4 = 855 l/kg Volume of Explosion Gases.
1.3 Explosion temperature.
The heat of explosion raises the reaction products to the explosion
temperature. Table 31 gives the internal energies of the reaction products
in relation to the temperature. The best way to calculate the
explosion temperature is to assume two temperature values and to
sum up the internal energies for the reaction product multiplied by their
corresponding mole number. Two calorific values are obtained, of
which one may be slightly higher than the calculated heat of explosion
and the other slightly lower. The explosion temperature is found by
interpolation between these two values.
For the example composition at: 3600 K and 3700 K. Table 31 gives for
3600 K Mole
Number
Product
kcal
3700 K Product
kcal
CO2 38.76 8.19 317.4 40.10 328.4
H2O 30.50 20.24 617.3 31.63 640.2
N2 20.74 9.37 194.3 21.45 201.0
O2 22.37 0.39 8.7 23.15 9.0
38.19 1138 1178
The interpolated temperature value for 1167 kcal/kg is 3670 K.
For industrial nitroglycerine-ammonium nitrate explosives, the following
estimated temperature values can be recommended:
Table 32
Heat of Explosion
Found
Lower value Upper Value
kcal/kg K K
900 2900 3000
950 3000 3100
1000 3100 3200
1050 3300 3400
1100 3400 3500
1150 3500 3600
1200 3700 3800
316