CHEN 3101 Chapter Notes - Chapter 13: Ideal Gas, Proton-Exchange Membrane, Waste Heat
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Chapter 13: reacting mixtures and combustion4/7/2015 12:06:00 am. Combustion reactions can be expressed as: reactants rearrange into products. Or: oxidation of fuel, combustion is complete when all carbon present in the fuel is burned to co2, all hydrogen burned to water, all sulfur burned to so2 (complete oxidization) Stoichiometric coefficients: coefficients preceding chemical symbols in a equation. Fuel = any combustible substance i. e. hydrocarbon fuels = hydrogen + carbon (+ sulfur and other chemicals) liquid hydrocarbon fuels come from crude oil: gaseous hydrocarbon fuels come from natural gas wells or produced in certain chemical process. Ultimate analysis: gives the composition of a substance on a mass basis. Idealized so it"s 21% oxygen and 79% nitrogen: assumes nitrogen in the air doesn"t undergo reactions. Air-fuel ratio: ratio of amount of air to amount of fuel in a reaction: can be on both mass or molar basis, and, af = air-fuel ratio on a mass basis.
