Fuel preparation from a waste sludge
AssigneeShell Oil Company
InventorHumbert H. Chu
Life of this patent
Estimating the term…
Abstract
Waste sludge that contains water, solids and oil, is mixed with a filter aid that has filter aid characteristics and a heating value of at least 1,000 Btu/lb. The admixture obtained is subjected to filtration yielding a high-Btu combustible material, useful as fuel. This combustible material, optionally after drying to remove water, is very suitable for use as fuel in a cement kiln.
Claims20
Process for the preparation of a fuel from a refinery waste sludge that contains water, solids and oil which process consists essentially of adding a combustible filter aid having filter aid characteristics of, a porosity of 2 to 100 Darcy, a density of 5 to 1200 kg/m.sup.3 and a particle size of 5 to 3000 micrometers, and a heating value of at least 1,000 Btu/lb to the refinery waste sludge, and subsequently subjecting the admixture obtained to filtration.
Combustible material consisting essentially of oil, refinery waste solids and a filter aid with filter aid characteristics of, a porosity of 2 to 100 Darcy, a density of 5 to 1200 kg/m.sup.3 and a particle size of 5 to 3000 micrometers, and a heating value of at least 1,000 Btu/lb.
Process for the preparation of cement clinker, in which cement starting material is fed to a kiln at one end and cement clinker is withdrawn therefrom at the other end, and solid fuel is combusted with a free oxygen-containing gas at the other end of the kiln and combustion gases are passed counter-currently to the cement starting material through the kiln to heat the cement starting material, in which process a combustible material is used as solid fuel that consists essentially of oil, refinery waste solids and a combustible filter aid with filter aid characteristics of, a porosity of 2 to 100 Darcy, a density of 5 to 1200 kg/m.sup.3 and a particle size of 5 to 3000 micrometers, and a heating value of at least 1,000 Btu/lb.
Dependencies are inferred from the claim text.