Importance

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Abstract

A waste-derived fuel is prepared to have a particular chemical composition, including ash content, ash composition and fuel value, and physical properties as required by a particular fuel user or burning process. The fuel is prepared by collecting different waste materials, chemically analyzing each waste material, and then blending and mixing together several different waste materials in appropriate proportions to provide the desired chemical composition and fuel value. The fuel is prepared to have a homogenous, uniform, and constant composition over time. The fuel is suited for use by itself or mixed with conventional fuels to be burned as a primary fuel in the main burner of a cement kiln and pre-calciner. In that case, the fuel is preferably formulated to provide an ash composition that approximates the composition of normal cement raw material mix. The fuel can provide increased amounts of particular elements or compounds as required by the fuel user. The fuel preferably contains calcium compounds other than calcium carbonate, and has a reduced proportion of carbon and an increased proportion of hydrogen as compared to coal, whereby use of the fuel in cement kilns reduces the carbon dioxide emissions from both the calcining process and the combustion process.

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First Claim