The calorific value of a specific pressed fuel briquette is related to the amount of oxygen required for thorough combustion. Usually, one gram of oxygen burnt, 14,022 J of energy can be released. It means the higher the oxidation of the fuel, the less the oxygen is required for thorough combustions and the lower the heating value of the fuel. Meanwhile when the fuel consisted of compounds with lower degree oxidation, such as, hydrocarbons, the heating value of the biomass will be higher.
The calorific value of the pressed fuel briquettes is limited by fuel moisture content for the reason that the heat is used to vaporized the water, lowering the heat released.
Furthermore, the calorific value of the fuel briquettes is also limited by the ash content. Approximately every 1% addition of ash translates to a 0.2 MJ/kg − 1 decrease in the heating value.
As for the calorific value of various fuel briquettes pressed from particular biomass are shown in the diagram below for your reference.
Esben M. Vestergaard
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