Method of gasifying solid fuels in a circulating fluidized bed

Details Method of gasifying solid fuels in a circulating fluidized bed Method of gasifying solid fuels in a circulating fluidized bed

C - Chemistry, Metallurgy

10

J

C10J 3/84 (2006.01) C10J 3/54 (2006.01) C10J 3/62 (2006.01) C10J 3/64 (2006.01) C10J 3/66 (2006.01)

Patent

CA 2275646

Combustible fuels, for example waste substances, biomass or coal, are gasified in a circulating fluidized bed with the addition of oxygenous gas at temperatures ranging from 700 to 1000 ~C. A fuel gas is obtained which contains dust and hydrocarbons, including higher hydrocarbons (C6+ hydrocarbons), and has a calorific value of between 2000 and 8000 kJ/m3. The dust-laden gas is passed through a separation chamber in which the higher hydrocarbons present in the gas are largely separated by the addition of gaseous oxygen at temperatures ranging from 800 to 1200 ~C and below the temperature of the ash melting point. The content of C6+ hydrocarbons present in the gas emerging from the separation chamber is at most 10 wt % of the initial content. The gas from the separation chamber is cooled and dedusted and passed through at least one bed or at least one reactor with granular solids which bind with pollutants. The gas-purification process is carried out without forming waste water.

Un combustible solide, par ex. sous forme de rejets, de biomasse ou de charbon, est gazéifié dans le lit fluidisé en circulation sous apport de gaz contenant de l'oxygène à des températures de l'ordre de 700 à 1000 ·C. On obtient un gaz combustible contenant des poussières et des hydrocarbures, y compris des hydrocarbures supérieurs (hydrocarbures C¿6+?) et présente une valeur calorifique comprise entre 2000 et 8000 kJ/m?3¿. Le gaz contenant les poussières est guidé à travers une chambre de séparation dans laquelle les hydrocarbures supérieurs contenus dans le gaz sont séparés dans une large mesure, sous apport d'oxygène gazeux à des températures comprises entre 800 et 1200 ·C et en dessous de la température de fusion des cendres. La teneur en hydrocarbures C¿6+? du gaz qui sort de la chambre de séparation représente tout au plus 10 % en poids de la teneur initiale. Le gaz qui se dégage de la chambre de séparation est refroidi, dépoussiéré et est guidé à travers au moins un lit ou au moins un réacteur avec des solides granulaires liant les polluants, la purification du gaz s'effectuant sans formation d'eaux résiduaires.

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