Numerical　simulations　were　conducted　to　investigate　the　interplay　of　combustion　and　decomposition　and　the　associated　NOx.　conversion　within　a　precalciner　with　burners.　A　multiple　surface　reactions　model　was　used　to　char　burning,　with　a　particular　focus　on　the　mechanisms　governing　the　combustion　of　pulverized　coal.　C02　partial　pressure＇s　impact　on　raw　meal　decomposition　was　considered　by　customizing　the　reaction　rate.　The　conversion　of　NOx.　was　studied　by　analyzing　CO　and　NO　interaction.　Simulation　results　were　in　reasonable　agreement　with　engineering　data.　The　results　indicate　that　the　presence　of　the　burners　makes　pulverized　coal　near　the　wall　and　combustion　along　it,　which　is　likely　to　damage　precalciner　wall.　Notably,　pulverized　coal　exhibits　a　high　burnout　rate,　and　the　main　combustion　zone　is　located　in　the　range　of　2.　53-7.　73　m.　The　raw　meal　is　decomposed　rapidly　at　the　height　of　9.　04　m　after　entering　into　the　precalciner,　with　a　final　decomposition　rate　of　91.　1%.　Due　to　the　initial　decomposition　site　of　the　raw　meal　is　higher　than　that　of　the　main　combustion　zone　of　pulverized　coal,　pulverized　coal　combustion　and　the　decomposition　of　the　raw　material　is　poorly　coupled　on　the　whole　,　and　there　are　two　obvious　local　high　temperature　zones　in　the　precalciner.　Furthermore　,　the　combustion　of　pulverized　coal　from　the　graded　coal　pipe　yields　a　substantial　amount　of　GO,　effectively　reducing　NO　from　the　flue　gas　chamber,　with　a　reduction　rate　of　57.　5%.　©　2024　Editorial　Office　of　Chemical　Engineering　(China).　All　rights　reserved.