Urea injection: new method for reducing NOX emissions from CFB boilers
Wtrysk mocznika: nowa metoda redukcji emisji NOx z kotłów CFB
Jolanta Ziaja, Janusz Lichota
Streszczenie
The purpose of this study is to show the results of a developed and tested method for the experimental minimization
of NOx emissions from a circulating fluidized bed (CFB) in a lignite-fired boiler, which was using the selective
non-catalytic reduction (SNCR) method. The paper shows that controlling the spatial distribution of urea and flow conditions
in the boiler makes it possible to minimize NOx emissions from a power boiler. In relation to the assumed objective,
the scope of the work included among others description of the research power unit, the development of a method for the
experimental reduction of NOx emissions in the flue gas under steady-state and transient conditions of the power unit
operation, presentation of measurement results and their analysis, determination of the influence of volume flows of air,
fuel, urea, sorbent (CaCO3), boiler geometry, spatial distribution of urea, boiler heat load, flue gas temperature, fuel composition
on NOx emissions. The method is described in detail in the doctoral thesis [1] of the first author.
of NOx emissions from a circulating fluidized bed (CFB) in a lignite-fired boiler, which was using the selective
non-catalytic reduction (SNCR) method. The paper shows that controlling the spatial distribution of urea and flow conditions
in the boiler makes it possible to minimize NOx emissions from a power boiler. In relation to the assumed objective,
the scope of the work included among others description of the research power unit, the development of a method for the
experimental reduction of NOx emissions in the flue gas under steady-state and transient conditions of the power unit
operation, presentation of measurement results and their analysis, determination of the influence of volume flows of air,
fuel, urea, sorbent (CaCO3), boiler geometry, spatial distribution of urea, boiler heat load, flue gas temperature, fuel composition
on NOx emissions. The method is described in detail in the doctoral thesis [1] of the first author.