Stoichiometric Combustion

Reference data and engineering information about stoichiometric combustion for combustion applications.

stoichiometriccombustion

Overview

Engineering reference data for Stoichiometric Combustion in combustion engineering.

$Q = \dot{m} \cdot HV$

Fuel energy release rate.

$AF = \frac{m_{air}}{m_{fuel}}$

Mass of air per mass of fuel.

$EA = \frac{O_2}{21 - O_2} \times 100\%$

From flue gas oxygen measurement.

The chemical equation for methane burned with 25% excess air is:

$CH_4 + 1.25 \times 2(O_2 + 3.76 N_2) \rightarrow CO_2 + 2 H_2O + 0.5 O_2 + 9.4 N_2$

The following table provides approximate values for CO₂ and O₂ in the flue gas as a function of excess air for various fuels.

6 rows

Approximate CO₂ and O₂ concentrations in flue gas as a function of excess air for various fuels.
Excess Air(%)	Natural Gas(% vol CO₂)	Propane/Butane(% vol CO₂)	Fuel Oil(% vol CO₂)	Bituminous Coal(% vol CO₂)	Anthracite Coal(% vol CO₂)	O₂ in Flue Gas(% vol)
0	12	14	15.5	18	20	0
20	10.5	12	13.5	15.5	16.5	3
40	9	10	12	13.5	14	5
60	8	9	10	12	12.5	7.5
80	7	8	9	11	11.5	9
100	6	6	8	9.5	10	10

Source: engineeringtoolbox.com