Method for combustion of pulverized coal with reduced emissions
Fuel compositions containing (a) pulverized coal; and (b) an oxygenate selected from glycerol, glycerol derivatives, propylene glycol, propylene glycol derivatives, ethylene glycol, ethylene glycol derivatives, fatty acid alkyl esters, fatty alcohols, and mixtures thereof. Methods of reducing the NOx emissions generated from the burning of pulverized coal in a heat-producing unit, wherein the method comprises the steps of: (a) introducing pulverized coal into a combustion chamber of the heat-producing unit; and (b) co-firing the pulverized coal with an oxygenate source selected from glycerol, glycerol derivatives, propylene glycol, propylene glycol derivatives, ethylene glycol, ethylene glycol derivatives, fatty acid alkyl esters, fatty alcohols, and mixtures thereof, where the combustion of the oxygenate source generates at least 2.5%, on a heat input basis, of the total heat generated by the co-firing.
1. A fuel composition providing reduced emissions of NOx when combusted, said composition comprising:
a) pulverized coal; and
b) an oxygenate comprising a glycerol derivative selected from the group consisting of glycerol ethers in which 1 to 3 of the glycerol hydroxyl groups have been etherified and mixtures thereof.
2. A fuel composition providing reduced emissions of NOx when combusted, said composition comprising:
a) pulverized coal; and
b) and oxygenate comprising a glycerol derivative selected from the group consisting of di t-butyl glycerol ethers, tri t-butyl glycerol ethers, solketal, and mixtures thereof.