Clay and slag additions are made during coal combustion processes to reduce unwanted emissions such as SO2, NOx and mercury. The clay additives may include kaolin. The slag additives may include stainless steel slag. The resultant combustion products may be used as cement additives.
B01D 53/80 - Semi-solid phase processes, i.e. by using slurries
B01D 53/83 - Solid phase processes with moving reactants
B01D 53/10 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents with dispersed adsorbents
B01D 53/64 - Heavy metals or compounds thereof, e.g. mercury
2.
ADDITIONS OF CLAY AND SLAG MATERIALS TO COAL COMBUSTION BOILERS
A method of combusting coal in the presence of a clay additive and a slag additive is disclosed. The combustion may occur in a coal combustion burner of a coal-fired electrical power generation plant. Co-injections of clay and slag improve operational efficiency of coal fired boilers by improving combustion, thermal heat transfer, steam output and/or electrical power output. The co-injections of clay and slag may also reduce unwanted emissions. The combustion product may be used as a pozzolanic addition to cement.
Coal is combusted in the presence of a clay additive and a slag additive to produce a combustion product that is useful as a pozzolanic additive for cement. The combustion process may be performed in a coal-fired boiler of an electrical power generation plant, resulting in improved operational efficiency and controlled emissions.
C04B 14/00 - Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stoneTreatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
4.
PRODUCTION OF COAL COMBUSTION PRODUCTS FOR USE IN CEMENTITIOUS MATERIALS
A method and system (10) for producing modified coal combustion products are disclosed. The additives reduce the particle sizes of the coal combustion product and may also reduce the un-burned carbon content of the coal combustion product, making the modified product useful as an addition to cementitious materials.
A method and system for producing modified coal combustion products are disclosed. The additives reduce the particle sizes of the coal combustion product and may reduce the amount of un-burned carbon in the coal combustion product, making the modified product useful as an addition to cementitious materials.
C04B 18/06 - Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
F23J 7/00 - Arrangement of devices for supplying chemicals to fire
C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
The present invention provides combustion products of hydrocarbon fuels and controlled amounts of metal oxide strength enhancing materials. The combustion products are useful as additives to cementitious materials. A hydrocarbon fuel such as coal is introduced into a combustion chamber (12) and selected amounts of materials comprising CaO, SiO2 and Al2O3 are also introduced into and/or downstream from the chamber (12). The hydrocarbon fuel undergoes combustion while the metal oxide strength enhancing materials react with each other and/or the ash or other reaction products of the hydrocarbon fuel. The combustion products have been found to significantly increase compressive strengths of cements such as Portland cement. A reduction in SO2 emission levels also results from the introduction of the metal oxide strength enhancing materials into the combustion process.
C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
7.
Production of cement additives from combustion products of hydrocarbon fuels and strength enhancing metal oxides
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