Question

Briefly describe whether adiabatic flame temperature is higher when burring with or oxygen.

Answer 1

The adiabatic flame temperature for burning C2H2 is higher for ocygen than compare to air.

Adiabatic flame temperature (constant pressure) of common gases/materials Fuel Acetylene (C2H2 Acetylene (C2H2) oxidizer Tad (C) Tad ('F) 2500 Oxygen 3480 6296 Air 4532

For a combustion process that takes place adiabatically with no shaft work, the temperature of the products is referred to as the adiabatic flame temperature. This is the maximum temperature that can be achieved for given reactants. Heat transfer, incomplete combustion, and dissociation all result in lower temperature. The maximum adiabatic flame temperature for a given fuel and oxidizer combination occurs with a stoichiometric mixture (correct proportions such that all fuel and all oxidizer are consumed). The amount of excess air can be tailored as part of the design to control the adiabatic flame temperature. The

Fig. 9. Effect of pressure on the adiabatic flame temperature for different oxidizers and particle sizes. Tad, 103K 5.0 4.5 4.0 air 3.5 Al-CO2 (g) 3.0 Al-H2O(liq) 2.5 Al (38 nm)-H2O (liq) 2.0 10 1 2 10 p, atm 10

From the graph also it is clear that at the same pressure the temperature is higher for oxygen than compare to air.