A circulating fluidized bed boiler with improved nox - reduction

摘要

The boiler includes a pipe (9) which extends along a longitudinal direction (l1) and which forms a flow of particles and gas containing nitrogen oxides, and a means for injecting into the stream a reagent making it possible to reduce said oxydes.ce means comprises at least one tubular rod (21) disposed so as to inject the reagent according to the longitudinal direction (l1) of the pipe (9) and co - common to the flow, which promotes the mixture with the nitrogen oxides and thus increases the efficiency of reduction. In a first embodiment, the boiler includes a combustion chamber (1) and a cyclone separator (11) connected together by said pipe (9), and each tube (21) is disposed in an upper part (1a) of the foyer.dans a second embodiment, the boiler includes an external dense fluidized bed heat exchanger and each rod is disposed in the upper part of the outside heat exchanger.