Reburn process
AssigneeInstitute of Gas Technology
InventorsMark J. Khinkis, Iosif K. Rabovitser, Michael J. Roberts
Life of this patent
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Abstract
A process and apparatus for combustion in which a combustible material is introduced into a combustion chamber and oxidant is supplied to the combustion chamber. The combustible material is burned, and forming a primary combustion zone. A mixture of flue gases and flyash having an organic content is injected into the combustion chamber downstream of the primary combustion zone to create an oxygen-deficient reburn zone, thereby lowering the temperature of combustion, reducing the NO.sub.x content of the flue gases, and reducing the potential for NO.sub.x formation in a tertiary oxidizing combustion zone disposed downstream of the oxygen-deficient reburn zone.
Claims17
A process for combustion comprising the steps of:
- introducing a combustible material into a material combustion zone within a combustion chamber;
- supplying oxidant to the material combustion zone, combusting the combustible material and forming a primary combustion zone;
- injecting a mixture of flyash having a particle size of about 93% minus 20 mesh to plus 100 mesh and having an organic content and of at least one carrier fluid into said combustion chamber to create an oxygen-deficient reburn zone downstream of said primary combustion zone;
- and
- injecting an oxygen-containing gaseous fluid into said combustion chamber downstream of said oxygen-deficient reburn zone, forming a tertiary oxidizing combustion zone downstream of said oxygen-deficient reburning zone.
A process for combustion of a combustible material comprising:
- introducing the combustible material into a combustion chamber and onto a stoker grate;
- supplying oxidant to the stoker grate for combusting the combustible material, forming a primary combustion zone;
- injecting a mixture of flyash having a particle size of about 93% minus 20 mesh to plus 100 mesh and having an organic content and of a carrier fluid above said primary combustion zone to create an oxygen-deficient reburn zone within said combustion zone;
- and
- injecting an oxygen-containing gaseous fluid into said combustion chamber downstream of said oxygen-deficient reburn zone, forming a tertiary oxidizing combustion zone downstream of said oxygen-deficient reburning zone.
Dependencies are inferred from the claim text.