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 - Procédés en phase semi-solide, c.-à-d. au moyen de boues
B01D 53/83 - Procédés en phase solide avec des réactifs en mouvement
B01D 53/10 - Séparation de gaz ou de vapeursRécupération de vapeurs de solvants volatils dans les gazÉpuration chimique ou biologique des gaz résiduaires, p. ex. gaz d'échappement des moteurs à combustion, fumées, vapeurs, gaz de combustion ou aérosols par adsorption, p. ex. chromatographie préparatoire en phase gazeuse avec adsorbants mobiles avec adsorbants dispersés
B01D 53/64 - Métaux lourds ou leurs composés, p. ex. mercure
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 - Emploi de matières inorganiques comme charges, p. ex. de pigments, pour mortiers, béton ou pierre artificielleTraitement de matières inorganiques spécialement prévu pour renforcer leurs propriétés de charge, dans les mortiers, béton ou pierre artificielle
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 - Résidus de combustion, p. ex. produits d'épuration des fumées, des émanations ou des gaz d'échappement
F23J 7/00 - Aménagement des dispositifs d'introduction de produits chimiques dans le foyer
C04B 28/02 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates contenant des ciments hydrauliques autres que ceux de sulfate de calcium
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 pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates contenant des ciments hydrauliques autres que ceux de sulfate de calcium
7.
Production of cement additives from combustion products of hydrocarbon fuels and strength enhancing metal oxides
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