Since　the　large　accumulation　amount　of　blast　furnace　slag　(BFS)　with　recycling　value,　it　has　become　a　hot　topic　for　recovery　utilization.　Compared　with　the　existing　various　BFS　granulation　process,　the　dry　granulation　process　can　promote　the　use　of　blast　furnace　granulated　slag　as　cement　substitute　and　concrete　admixtures.　Our　research　group　developed　a　novel　dry　cooling　granulation　experiment　device　to　treat　BFS.　However,　there　are　still　some　problems　to　be　solved.　The　purpose　of　this　research　is　to　improve　the　cooling　and　granulation　efficiency　of　the　existing　dry　type　cooling　equipment.　This　topic　uses　the　FLUENT　simulation　software　to　study　the　impact　of　the　number　of　air　inlet　on　the　cooling　effect　of　the　device.　The　simulation　result　is　that　the　device　possessing　eight　air　inlets　can　increase　the　number　of　hot　and　cold　gas　exchanged,　resulting　in　a　better　cooling　effect.　According　to　the　power　consumption,　LCA　analysis　was　carried　out　on　the　cooling　granulation　process.　The　results　show　that　the　device　equipped　eight　air　inlets　not　only　improved　the　original　equipment　cooling　granulation　effect,　but　also　increased　resource　utilization　ratio,　realized　energy-saving　and　emission　reduction.