Aiming　at　a　new　type　of　swirl　precalciner,　numerical　simulations　were　carried　out　for　the　pulverized　coal　combustion,　raw　meal　decomposition　coupling,　and　NOx　generation　processes.　In　Euler　coor-dinate　system　gas　phase　was　expressed　with　the　Realizable　k-ε　two-equation　model,　in　Lagrange　coordi-nate　system　solid　phase　was　expressed　with　the　discrete　phase　model(DPM),pulverized　coal　combustion　and　raw　meal　decomposition　was　expressed　with　the　species　transport　model,radiation　was　expressed　with　the　P-1　model,　NOx　generation　was　expressed　with　the　pollutant　model.　Thermal　NOx　and　fuel　NOx　generation　are　considered.　The　results　show　that　the　tertiary　air　mainly　moves　upward　along　the　wall　spiral,　while　the　flue　gas　mainly　moves　the　central　axis　spiral　in　the　precalciner.　When　the　pulverized　coal　enters　the　precalciner,　the　volatiles　are　rapidly　released　and　burned,　and　then　the　char　continues　to　burn,　and　its　main　combustion　area　is　near　the　shell.　When　the　pulverized　coal　enters　the　precalciner,　the　volatiles　are　rapidly　released　and　burned,　and　then　the　char　continues　to　burn,　and　its　main　combustion　area　is　near　the　shell,　and　the　combustion　residence　time　is　approximately　5.　9　s.　The　raw　meal　decomposes　rapidly　after　entering　the　precalciner.　When　reaching　a　height　of　50　m　in　the　precalciner,　the　decomposition　rate　of　CaCO3　reaches　90%.　At　this　point,　the　decomposition　times　for　the　lower　and　upper　raw　meal　are　approximately　6.　5　s　and　4.　7　s,　respectively.　92.　32%　decomposition　of　calcium　carbonate　at　the　outlet.　Due　to　the　poor　coupling　between　pulverized　coal　combustion　and　raw　meal　decomposition　at　the　shell,　local　high　temperatures　are　formed　at　the　wall,　which　makes　the　NOx　generation　rate　larger,　and　the　NOx　at　the　outlet　reaches　1.　251×10-3,　which　needs　to　be　improved.　©　2025,　Tianjin　University.　All　rights　reserved.