Question

For a butanol combustion process (formation enthalpy -332,000 kJ / kmol) C4H10O with an excess of 25% air (reagents are at standard conditions T = 25 C, P = 1atm).

Determine:

a. Adiabatic flame temperature

b. If the products come out at a temperature of 600 K, determine the heat generated in the combustion chamber.

Answer 1

Solution:

Given that:

Let us consider the reaction without excess air for complete combustion.

Balancing the equation:

​​​​​​

Now with 25% excess air becomes:

(a) Adiabatic flame temperature:

For adiabatic flame temperature

So,

Now,

Now, Hit & Trail get

Let T =2200 K

Let

Let T=x and interpolate as because value will lies b/w 2000-2200 K

(e) If temperature of product is 600K. then heat generated

at T = 600 K

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