Low NOx pulverized solid fuel combustion process and apparatus
AssigneeInstitute of Gas Technology
InventorsIosif K. Rabovitser, Richard Knight, Mark J. Khinkis, Hamid A. Abbasi, Stan Wohadlo
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Abstract
A method and apparatus for low-NOx combustion of a pulverized solid fuel in which combustion products from a partial oxidation combustor are mixed with a pulverized solid fuel, thereby preheating the pulverized solid fuel and resulting in devolatilization of at least a portion of the pulverized solid fuel. The preheated pulverized solid fuel and the devolatilization products are then burned in a burner firing directly into a combustion chamber.
Claims31
A method for low-NOx combustion of a pulverized solid fuel comprising the steps of:
- burning an auxiliary fuel under fuel-rich conditions, producing at least one stream of combustion products;
- mixing a mixture of pulverized solid fuel and a gaseous carrier fluid with said combustion products, forming a mixture of said pulverized solid fuel, said gaseous carrier fluid, and said combustion products;
- heating said pulverized solid fuel and said gaseous carrier fluid by mixing with combustion products in a preheater, resulting in preheated pulverized solid fuel and devolatilization of at least a portion of said pulverized solid fuel and formation of devolatilization products;
- and
- burning said preheated pulverized solid fuel and said devolatilization products in a combustor comprising a burner firing directly into a combustion chamber, resulting in formation of a primary combustion zone within said combustor.
An apparatus for low-NOx combustion of a pulverized solid fuel comprising:
- a pulverized solid fuel supply;
- a partial oxidation combustor having an auxiliary fuel input and a partial oxidation combustion products outlet;
- at least one mixing chamber wall enclosing a mixing chamber and forming at least one mixing chamber inlet opening in fluid communication with said pulverized solid fuel supply and said partial oxidation combustion products outlet and having a pulverized solid fuel/combustion products mixture outlet;
- at least one preheater wall enclosing a preheating chamber and forming a preheater inlet opening in fluid communication with said pulverized solid fuel/combustion products mixture outlet and forming a preheated pulverized solid fuel outlet opening;
- and
- a pulverized solid fuel combustor comprising a pulverized solid fuel burner and a combustion chamber, said pulverized solid fuel burner having a burner inlet in fluid communication with said preheated pulverized solid fuel outlet opening, a burner outlet in fluid communication with said combustion chamber, and a primary combustion oxidant inlet.
Dependencies are inferred from the claim text.