Abstract : in the internal circulating fluidized bed , there exist the moving zone , fluidizing zone and heat transferring zone with different fluidized air velocities . the convection heat transfer coefficient of immersed tube in the heat transferring zone is impacted by the velocity of the moving zone nearby and its data and change trend are obviously different with those of the common bubbling bed . the maximum heat transfer coefficient is evidently higher than that of the bubbling bed . as the bed materials have not been fluidized in the heat transfer zone , the coefficient has increased highly . the curve of that changes gently , feasilble to control the combustion intensity in the fluidizing zone 文摘:垃圾焚燒系統(tǒng)中,內(nèi)旋流流化床存在不同布風(fēng)速度的移動(dòng)區(qū)、流動(dòng)區(qū)和換熱區(qū),處于換熱區(qū)的埋管的對流換熱系數(shù)受附近流動(dòng)區(qū)氣流參數(shù)的影響,其變化趨勢及數(shù)值大小與普通鼓泡型流化床之間有明顯不同:最大的對流換熱系數(shù)明顯高于鼓泡床;換熱區(qū)尚未流化時(shí),對流換熱系數(shù)已經(jīng)大幅提高;整條換熱曲線的變化比較平緩,易于流化床濃相床內(nèi)換熱。