Method of reducing the emission of nitrous oxide at the time of the combustion of nitrogen containing fuel in a fluidized bed reactor

摘要

The amount of N2O emission from a fluidized bed reactor is reduced by adding a hydrogen radical providing additive (e.g. a hydrogen containing fuel such as natural gas or alcohol) to the flue gases discharged from the fluidized bed. Sufficient oxygen is present in the flue gases - either by addition with the additive, or by addition of an excess to the combustion chamber - so that the additive reacts with the oxygen, typically raising the temperature of the flue gases (e.g. from about 700-900 °C to about 950-1100 °C) so that N2O production is reduced about 10-90 %. The additive may be injected in or just prior to a cyclone for separating particles from the flue gases, or just prior to a superheater of a convection section, or in a combustion chamber just prior to a gas turbine.