In　this　paper,　a　new　bell-type　air　nozzle,　which　overcomes　the　structural　defects　of　traditional　bell-type　air　nozzles,　is　proposed　and　validated　by　cold　test　and　numerical　simulation.　The　pressure　drop　characteristic　of　the　new　bell-type　air　nozzle　is　measured.　Furthermore,　the　causes　of　cover　outlet　abrasion　and　blockage,　inner　tube　fracture,　and　irregular　resistance　change　in　traditional　bell-type　air　nozzles　applied　in　circulating　fluidized　bed　(CFB)　boilers　are　analyzed.　Then,　the　performance　of　the　new　bell-type　air　nozzle　is　evaluated　in　a　real　CFB　boiler,　which　is　operated　under　regular　working　conditions.　The　results　show　that　the　new　bell-type　air　nozzle　has　stronger　anti-wear　ability,　excellent　resistance　characteristics,　longer　service　life,　and　easier　maintenance.