Experimental Study Of Heat And Mass Transfer Between Particles And Gas In CFB Using Naphthalene Sublimation Technique

In this thesis, the influence of the bed height, the interfacial air velocity, the volume of the circulating particles, the particles size and the average interval efficiency etc. on the interfacial coefficient of the mass transfer between particles and gas in circulating fiuidized bed (CFB) was investigated, and the influence of the realy Re of gas and the bed dimensionless height on the coefficient of convection heat transfer was analysed by applying the naphthalene sublimation technique in the self-mading CFB test-bed. And from analyzing the experimental data, many conclusions were gained, for instance:(1) The interfacial coefficient of the mass transfer between particles and gas increased along with the average interval efficiency increasing.(2) The interfacial coefficient of the mass transfer between particles and gas increased along with the interfacial air velocity increasing.(3) The interfacial coefficient of the mass transfer between particles and gas minished along with the volume of the circulating particles increasing.(4) The interfacial coefficient of the mass transfer between particles and gas minished along with the bed height increasing.(5) The interfacial Nu increased along with the realy Re of gas increasing, and minished along with the bed dimensionless height increasing.In addition, from sorting out and analyzing the experimental data, the interfacial heat transfer equations between particles and gas were reached by applying the Liner Regression Modle and the Least Double Multiplication, and validated the equations, analysed the errors of the experimental Nu.This investigation aimed at heat and mass transfer between particles and gas in CFB. It's very important to knowing the theory of the heat and mass transfer between particles and gas, and was the base of the following investigations.