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Difference between revisions of "Gasification"
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Bas Davidis (talk | contribs) (Gasification process) |
Bas Davidis (talk | contribs) m (→Pyrolysis) |
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<chem> C + O2 -> CO2</chem> | <chem> C + O2 -> CO2</chem> ΔH = -349 kJ/mol (Char combustion) | ||
<chem>C + 1/2O2-> CO</chem> | <chem>C + 1/2O2-> CO</chem> ΔH = -111 kJ/mol (Partial oxidation) | ||
<chem>H2 + 1/2O2 -> H2O</chem> | <chem>H2 + 1/2O2 -> H2O</chem> ΔH = -242 kJ/mol (Hydrogen combustion) | ||
The main product of this phase is the thermal energy, while the combustion product is a gas mixture of CO, CO<sub>2</sub> and water. | The main product of this phase is the thermal energy, while the combustion product is a gas mixture of CO, CO<sub>2</sub> and water. | ||
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Pyrolysis is the thermochemical decomposition of organic compounds. In particular, the cracking of chemical bonds takes place with the formation of three different fractions: a solid, a liquid and a gaseous fraction. The pyrolysis reaction takes place with a temperature in the range of 250-700°C. It is an endothermic reaction and, as in the drying step, the heat required comes from the oxidation process. The pyrolysis of organic material can be schematized with the following overall reaction: | Pyrolysis is the thermochemical decomposition of organic compounds. In particular, the cracking of chemical bonds takes place with the formation of three different fractions: a solid, a liquid and a gaseous fraction. The pyrolysis reaction takes place with a temperature in the range of 250-700°C. It is an endothermic reaction and, as in the drying step, the heat required comes from the oxidation process. The pyrolysis of organic material can be schematized with the following overall reaction: | ||
<chem>Biomass <=> H2 + CO + CO2 + CH4 + H20 + Tar + Char</chem> | |||