PHOSPHOR ADDITION IN GASIFICATION

摘要

The present invention provides a method useful in combustion, gasification or pyrolysis processes. The method is useful for the thermal treatment of carbonaceous fuels containing the inorganic species potassium and/or sodium. The method may be utilized for combustion, gasification or pyrolysis processes for conversion of biomass, coals, waste materials or chars of the above mentioned materials prepared by pyrolyzing the original material. The residual materials may act as a fertilizing agent and thus the value of the residual materials is improved. The method utilizes phosphor, in the form of phosphoric acid or salts of phosphor. The alkali and alkali earth metals in the fuel reacts with the added externally provided phosphor, which may be added in the form of phosphoric acid, phosphor oxides or salts of phosphor. The alkali or earth alkali metals are in the here proposed process converted tophosphates, ortho-phosphates, potassium phosphate, sodium phosphate, calcium phosphate, potassium calcium phosphates or calcium hydrogen phosphate. The resulting compositions strongly reduce alkali induced corrosive effects, and have high melting temperatures, thus having an anti sintering effect on the process.