Experimental Study On Resistance Characteristics In Vertical Tank For Recovering Sinter Waste Heat

The resistance characteristics of gas flow in material layer is one of the key factors to influence the gas-solid heat transfer and flow in the sintering waste heat recycling tank. Based on the corrected coefficient and index of existing Ergun formula, there are many shortcomings in describing the resistance characteristics of the material layer:Depend on the void fraction accurately measure is easy to cause error; Suitable for small particles bed(0.1<Rep<1000), and the particles approximate spherical, the sinter particles don’t match them. Based on this point, the related date of the resistance characteristics of gas flow in material layer were tested in different cases on the homemade experimental platform. The influence of relevant parameters have been learned deeply in this paper. And then the experimental correlation formula of dimensionless number for reflect sinter layer resistance characteristic was derived by applying dimensional analysis, the regression analysis was used to determine the coefficient and index of the empirical equations. In addition, wall effect and powder content effect on the material layer resistance have been learned. This research points out the direction for reducing resistance losses in the sinter of tank and do good for numerical calculation of gas flow process in sinter layer.(1) Establish pressure drop formula of fixed bed through dimensional analysis combining data regressions. The formula is as follows:(2) The range of superficial velocity in applications may be1-2m/s, at this point, the range of pressure loss per unit height may be0.64kPa/m-2.06kPa/m.(3) Superficial velocity U, particle size dp and the distribution PSD have greater influence on the material layer resistance△P. The relationship between pressure drop and superficial velocity is:AP∝U1681; the relationship between the equivalent diameter of particles and pressure drop is:△P∝dp-1.56. (4) The nature size particles:when0.38m/s<U<3.5m/s, the pressure drop of material layer is not affected by the wall effect; Others:when U<2m/s, wall effect don’t affect the pressure drop of the material layer, when U>2.5m/s, D>5dp, the relationship between per height pressure drop of the material layer and the diameter of the vertical tank:△P/L∝D0.241.(5) The relationship between pressure drop of material layer and the percentage of fines is as follows:...