Method of protecting incinerator surfaces

Claim 1

A method of increasing the fusion temperatures of combustion products formed during the incineration of sewage comprising the steps of: mixing one or more additive materials selected from the group SiO 2 , CaO, Al 2 O 3 , MgO with sewage consisting essentially of from about 90 to 98 percent water and from about 2 to 10 percent sewage solids, wherein the combined weight of the additives is not greater than 30 percent of the weight of the sewage solids, with the CaO, Al 2 O 3 and MgO being selected from within the range of 10 to 30 percent of the weight of the sewage solids and SiO 2 being selected from within the range of 25 to 30 percent of the weight of the sewage solids; maintaining said additive materials uniformly dispersed within the sewage-additive mixture; dispersing said sewage-additive mixture into a combustion zone of an incinerator such that the sewage solids and additive particles are maintained in contact; retaining the additives and sewage solids in contact within a combustion zone of an incinerator for sufficient time for the additives to chemically combine with the waste solids so that the ash product formed by the combustion of the waste solids and additives has an increased range of fusion temperatures above the operating temperatures of the incinerator walls.

Claim 2

A method of increasing the fusion temperatures of combustion products formed during the incineration of sewage comprising the steps of: mixing one or more additive materials selected from the group SiO 2 , CaO, Al 2 O 3 , MgO with sewage consisting essentially of from about 90 to 98 percent water and from about 2 to 10 percent sewage solids, wherein the combined weight of the additives is not greater than 30 percent of the weight of the sewage solids, with the CaO, Al 2 O 3 and MgO being selected from within the range of 10 to 30 percent of the weight of the sewage solids and SiO 2 being selected from within the range of 25 to 30 percent of the weight of the sewage solids; maintaining said additive materials uniformly dispersed within the sewage-additive mixture; dispersing said sewage-additive mixture into a combustion zone of an incinerator such that the sewage solids and additive particles are maintained in contact; retaining the additives and sewage solids in contact within a combustion zone of an incinerator for sufficient time for the additives to chemically combine with the waste solids so that the ash product formed by the combustion of the waste solids and additives has an increased range of fusion temperatures above the operating temperatures of the incinerator walls.

Claim 4

A method of preventing corrosion of surfaces of incinerators designed to burn sewage by raising the fusion temperature of the sewage ash products above the operating temperatures of the incinerator surfaces comprising the steps of: mixing additives containing one or more of SiO 2 , CaO, Al 2 O 3 , MgO with sewage consisting essentially of from about 90 to 98 percent water and from about 2 to 10 percent solids, wherein the combined weight of the additives is not less than 10 percent nor greater than 30 percent of the weight of the sewage solids; injecting the sewage-additive mixture under pressure into a combustion zone of an incinerator such that the sewage solids and additive particles remain in contact during incineration; incinerating the sewage-additive mixture for sufficient time for the additives to chemically combine with the combustion products formed by the decomposition of the sewage solids to form an ash product having a fusion temperature above the operating wall temperatures of the incinerator.

Claim 5

A method of preventing corrosion of surfaces of incinerators designed to burn sewage by raising the fusion temperature of the sewage ash products above the operating temperatures of the incinerator surfaces comprising the steps of: mixing additives containing one or more of SiO 2 , CaO, Al 2 O 3 , MgO with sewage consisting essentially of from about 90 to 98 percent water and from about 2 to 10 percent solids, wherein the combined weight of the additives is not less than 10 percent nor greater than 30 percent of the weight of the sewage solids; injecting the sewage-additive mixture under pressure into a combustion zone of an incinerator such that the sewage solids and additive particles remain in contact during incineration; incinerating the sewage-additive mixture for sufficient time for the additives to chemically combine with the combustion products formed by the decomposition of the sewage solids to form an ash product having a fusion temperature above the operating wall temperatures of the incinerator.