| In order to realize the potential economic value of waste of potato starch production,reduce production costs protein feed is even more important, and drying costs of cellularproteins is an important factor in protein feed production costs. In this experiment, thedrying characteristics of cell protein the product of fermentation during waste of potatostarch production resources were determined, and by changing the drying conditions andmethods to assess the feasibility of cell protein drying process, and further combining theresults of the mathematical model to optimize the air drying process of cell protein.The particle density of completely dry cell protein is1.27×103kg/m3, and theparticle density of the cell protein which moisture content is62.82%inlet pneumaticdrying is1.05×103kg/m3, and verify that the difference between the actual measurementof the density of cell protein with theoretical values obtained by the density of cellularproteins, the results show that the theoretical and actual values have a good fit. Cellprotein particle size distribution measurement results indicate that cellular proteins aremore concentrated, which dominated the particle size distribution to200nm. Cell proteinsuspension velocity at the entrance and exit of air drying are2.25m/s and5.87m/s.According to the drying curve with the curve of the critical temperature of the watercontent, and ultimately get the air drying temperature160℃under critical water contentis4.09%.We investigated the effects of different drying temperature and time on the degreeof cell protein denaturation of proteins, amino acid content and rehydration. Made overthe extent of protein denaturation curve of time, finally get air drying temperature, thedrying time of43.32s time-varying degree of cell protein up to80%.We made a curveovertime of the amino acid content of the finally obtained air-drying temperature, thedrying time is114.40s. Cell protein amino acid content can be maintained at90%. Maderehydration curve over time, eventually got under air drying temperature, the drying timeis108.48s. Rehydration rate of cellular proteins can be maintained at80%.We established the mathematical model of air drying process, according to their owndesign conditions, the drying process drying tube to simulate the material, obtained bygas temperature field, temperature field of solid-phase, solid phase axial velocity field,the solid phase volume fraction pressure field distribution optimization scheme proposeddrying process. Entrance suspension velocity is5.87m/s, taking into account the dryingtube main pipe length36.39m, pulse tube diameter ratio is1:1.28, the inlet air flow rateshould be less than7.52m/s, the drying time is4.84s. Amount of the inlet temperaturecan be further reduced to improve the energy consumption of the drying process and equipment, adjustment of the pulse tube diameter ratio between1:1.5and1:2, the inletflow velocity close to10m/s, the drying time is3-4s. |
