Municipalsolid　waste　incineration　(MSWI)　has　significant　advantages　in　terms　of　harmlessness,　reduction,　and　resource　utilization.　Pollution　emission　control　is　a　major　problem　in　the　operation　of　MSWI　plants.　Therefore,　to　understand　the　formation,　reduction,　and　combustion　mechanism　of　NOx　in　the　furnace,　this　article　proposed　a　numerical　simulation　model　based　on　coupling　several　software.　First,　according　to　the　typical　grate　MSWI　process,　the　relevant　reaction　mechanism　of　NOx　in　the　furnace　is　described.　Then,　according　to　the　grate　and　gas　reaction　mechanism　of　an　MSWI　plant　in　Beijing,　the　reaction　region　is　divided,　and　the　numerical　simulation　model　is　constructed　based　on　the　benchmark　parameters　of　the　actual　MSWI　plant.　Finally,　the　effectiveness　of　the　numeral　simulation　model　is　verified　by　experiments.　These　results　can　provide　support　for　the　pollution　optimization　control　of　the　actual　MSWI　process.　©　2024　IEEE.