Composition for use in reducing air contaminants from combustion effluents
AssigneesLucille Markham, The University of Southern Mississippi, Frontend International Technologies, Inc., Parsons & Crowther
InventorsLucille Markham, Steven J. Bortz
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Abstract
An effective process is provided for cleanly and safely combusting coal or other carbonaceous material in a manner which enhances the environment by reducing emission of pollutants. In order to reduce nitrogen oxide and sulfur oxide emissions during combustion, combustion is carried out in the presence of one or more additives comprising an alkali metal salt, such as sodium chloride. To further enhance the reaction and removal of sulfur oxides and nitrogen oxides, the additive can include an iron-containing compound, such as iron oxide, and/or a metal oxide, such as manganese oxide.
Claims9
A combustion process, comprising the steps of:
- combusting substantially solid carbonaceous material selected from the group consisting of coal, lignite, peat, oil shale, tar sands, uintaite, and biomass in the presence of a Group 1a alkali metal salt selected from the group consisting of potassium chloride, sodium chloride, lithium chloride, potassium bromide, lithium bromide, and sodium bromide, and in the absence of recycled flue gases;
- emitting nitrogen oxides selected from the group consisting of nitric oxides and nitrogen dioxides during said combustion;
- while simultaneously
- converting a substantial amount of said nitrogen oxides to molecular nitrogen during said combustion.
A combustion process, comprising the steps of:
- directly combusting coal with a flame in a reaction zone in the presence of air and an additive comprising sodium chloride;
- producing heat from said combustion while simultaneously emitting effluent combustion gases comprising nitrogen oxides selected from the group consisting of NO and NO.sub.2 ;
- and
- converting a substantial amount of said nitrogen oxides to molecular nitrogen during said combustion to substantially purify said combustion gases.
A combustion process, comprising the steps of:
- directly combusting coal with a flame in the presence of air and an additive composition comprising:
- from about 20% to about 60% by weight sodium chloride, from about 5% to about 50% by weight of an oxide of manganese, and from about 10% to about 50% by weight iron oxide;
- producing heat from said combustion while simultaneously emitting effluent combustion gases comprising sulfur dioxides and nitrogen oxides;
- and
- substantially purifying said combustion gases by substantially removing and reducing said nitrogen oxides and sulfur oxides with said additive composition.
Dependencies are inferred from the claim text.