Importance

Loading Importance Indicators...

Abstract

The invention relates to a composition and a method of capturing sulphur emanating from burning carbonaceous fuel particles of an aqueous fuel composition which comprises about 60-80% by weight of carbonaceous fuel particles with an ash content of below about 5% by weight on a dry basis, about 0.05-2.0% by weight of a flow-enhancing chemical which includes a non-ionic dispersant, and a liquid carrier phase consisting essentially of water. The sulphur is captured prior to formation of gaseous sulphur oxides which become diluted on the gaseous phase during and after combustion, and involves the introduction of a sulphur captor which preferably is chosen from hydroxides, oxides or carbonates of calcium or magnesium on or in reaction-facilitating proximity to the burning carbonaceous fuel particles, thereby utilizing local chemical potential in the formation of locally or relatively stable sulphides at relatively low oxygen potentials, the sulphur being captured during the combustion phase as solid sulphide and subsequently, when the temperature drops as the solid combustion residue leaves the flame and the local oxygen potential rises, and sulphate formation occurs, as the sulphate. The amount of sulphur in the combustion off gas is accordingly greatly reduced according to the method of the present invention.

Loading the Abstract Image...

First Claim