Method for reducing agglomeration, sintering and deposit formation in gasification and combustion of biomass

The present invention relates to a method for reducing agglomeration, sintering and deposit formation resulting from the gasification or combustion of a solid carbonaceous fuel material comprising a combustible portion and a non combustible inorganic portion, which non combustible inorganic portion comprises 4 to 50 parts by weight of K +Na , and 0 to 40 parts by weight of Si , wherein K is potassium, Na is sodium, and Si is silicon, all calculated in parts by weight of the elements per 100 parts by weight of the inorganic portion, and optionally also chloride, phosphorus, calcium and sulphur. This type of solid carbonaceous fuel material having a substantial content of potassium and in some cases also sodium is typically met in solid fuels having a high proportion of a biomass material, such as straw. The present invention relates to a method for reducing agglomeration, sintering and deposit formation resulting from the gasification or combustion of a solid carbonaceous fuel material comprising a combustible portion and a non combustible inorganic portion, which non combustible inorganic portion comprises 4 to 50 parts by weight of K+Na, and 0 to 40 parts by weight of Si, wherein Kis potassium, Nais sodium, and Siis silicon, all calculated in parts by weight of the elements per 100 parts by weight of the inorganic portion, and optionally also chloride, phosphorus, calcium and sulphur which method is characterised in adding to the fuel before or during the gasification or combustion, Pparts by weight of phosphorus compound calculated as P wherein the amount Pis calculated in accordance with the formula Iwherein q1=0.33 to 5, and Pand Clare the amount of phosphorus and chloride, respectively, present in the fuel material before the addition calculated in parts by weight of the elements per 100 parts by weight of the inorganic portion, and if necessary Caparts by weight of calcium compound calculated as Ca wherein the amount Cais calculated in accordance with formula IIwherein q2=0-3 and Cais the amount of calcium present in the fuel material before the addition.