SYSTEM AND METHOD FOR NON-CATALYTIC REDUCTION OF NITROGEN OXIDES

摘要

The invention makes it possible to reduce nitrogen oxides in combustion apparatuses (1) with a high level of reduction efficiency as compared with the amount of nitrogenated reducing agent employed. The invention comprises injectors (9a, 9b, 9c, 9d) for the injection of the reducing agent; a system for analysing the concentration of gases (CO, CO2, O2 and NOX1); means for calculating the stoichiometric relationship as a function of the CO, CO2, and O2 concentrations; and a control system for, on the basis of the values of CO, CO2, O2 and NOx1 concentration, influencing the supply of fuel and air to the apparatus (1), with the aim of achieving SR values of between 0.8 and 1 at the points and also injecting a flow of reducing agent only at the SR points below 1, where said flow is proportional to the measured NOx concentrations.