Kinetics of the nitrogen oxides reaction with coke carbon in a low-temperature swirl furnace process

Abstract

The work is devoted to the increase of ecological parameters of organic fuel burning process in power boilers combustion chambers. The technological method of nitrogen oxides decomposition on the surface of carbon particles with the formation of environmentally safe carbon dioxide and molecular nitrogen in low-temperature swirl combustion is considered. A methodology, a mathematical model and a program for calculating the process of a fuel combustion under conditions of multiple circulation, with periodic return of fuel particles to zones with the initial concentration of oxygen, are developed. It is shown that the stepwise supply of the oxidizer to the flare leads to a decrease in the generation of toxic nitrogen oxides, the formation of reducing zones, and the decomposition of the formed nitrogen oxides on the surface of burning coke particles. It has been established that the amount of decomposed nitrogen oxides depends on the surface area of the reacting fuel particles, as well as the time of their stay in the swirl zone of the low-temperature swirl furnace. With the use of calculated results, emissions of nitrogen oxides of reconstructed boilers are reliably predicted.