초록 ▼

A method for combusting nitrogen-containing fuel by: combusting a first fuel-air mixture in the presence of a catalyst in a first stage, operated fuel-rich so that the amount of air in the first stage is substantially less than the amount needed for complete combustion; adding additional air to the

A method for combusting nitrogen-containing fuel by: combusting a first fuel-air mixture in the presence of a catalyst in a first stage, operated fuel-rich so that the amount of air in the first stage is substantially less than the amount needed for complete combustion; adding additional air to the effluent gas from the first stage to form a second mixture with an amount of air at least sufficient to combust fully the effluent from the first stage; and then combusting the second mixture in a second stage. The first mixture is sufficiently fuel-rich, and the second mixture contains sufficient additional air, so that the combustion temperature in the first stage is below a temperature that would result in any substantial formation of oxides of nitrogen or other fixed nitrogen compounds from atmospheric nitrogen present in the mixture being combusted, and the second stage temperature also is below that for substantial nitrogen oxide formation therefrom. The method serves to suppress formation of nitrogen oxides from the nitrogen-containing compounds in the fuel.

대표청구항 ▼

The method of combusting nitrogen-containing fuel while suppressing formation of oxides of nitrogen from said nitrogen contained in the fuel, comprising: forming a first mixture of said fuel and an amount of air substantially less than the amount needed for complete combustion of all the combustible

The method of combusting nitrogen-containing fuel while suppressing formation of oxides of nitrogen from said nitrogen contained in the fuel, comprising: forming a first mixture of said fuel and an amount of air substantially less than the amount needed for complete combustion of all the combustible components in said fuel but sufficient to support substantial combustion of said fuel combusting said first mixture in a first combustion zone in the presence of a catalyst, having an operating temperature below a temperature that would result in any substantial formation of oxides of nitrogen or other fixed nitrogen compounds from atmospheric nitrogen present in said mixture, to form a first effluent; mixing said first effluent with an additional amount of air at least sufficient for complete combustion of all combustible components remaining in said first effluent to form a second mixture; and combusting said second mixture in a second combustion zone below a temperature that would result in any substantial formation of oxides of nitrogen from atmospheric nitrogen.