#### Combustion Reactions: Screencasts

Overview of combustion, which is the reaction of fuel (usually hydrocarbons) with oxygen to produce water, carbon dioxide/carbon monoxide, and energy. Reviews percent excess air and wet/dry basis.

We suggest that after watching this screencast, you list the important points as a way to increase retention.

Introduces percent excess air for combustion reactions.

We suggest that after watching this screencast, you list the important points as a way to increase retention.

##### Important Equations:

$\% \; \mathrm{Excess\; Air = \frac{moles\; air\; fed – stoichiometric\; moles\; air}{stoichiometric\; moles\; air}} * 100\%$

Only complete combustion is considered in order to determine the stoichiometric moles of air required when calculating percent excess air.

For each species involved in a combustion reaction:

$n_i = n_{i0} + \nu _i \xi$

where $$n_i$$ is the number of moles of component $$i$$ leaving the reactor, $$n_{i0}$$ is the number of molecules of component $$i$$ entering the reactor, $$\nu _i$$ is the stoichiometric coefficient of component $$i$$ (negative for reactants, positive for products), and $$\xi$$ is the extent of reaction.