Combustion reaction of biomas

Combustion reaction of biomas 

• Biofuels consists mainly of C and H atoms arranged in different compounds such as cellulose, hemicellulose, methane, etc,.
•  Some biofuels such as alcohols can have a dominant single compound such as ethanol and can be represented by a single compound formula such as C₂H₅OH
• Other biofuels, like biomass contains different types of compounds. In combustion analysis these types of biofuels are better dealt if they are represented according to their ultimate analysis, i.e., the percentage in mass of C, H, O, S, Cl, and N elements in the fuel
• In biomass fuels the percentage of S, Cl, and N elements are normally very small.
• The combustible elements in most biomass fuels, are C, H, and S. These are converted into carbon dioxide (CO₂), water vapor (H₂O), and sulfur dioxide (S0₂), respectively
• Combustion reaction can be generally represented a                                                                                          FUEL + AIR à CO₂ + H₂O + N₂ + {heat}
• In actual situation the combustion reaction is very fast, and some reactions do not complete due to inability to find oxygen (poor mixing, time)
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The heat produced (even though it is the target) creates other unwanted reactions:

                -dissociation reactions (reduce flame temperature)

                -Pollutants formation, and especially NO_x

          NO_x, HCl, and SO₂ causes acid rain, smog formation, and respiratory diseases