| Potato starch as raw material, is commonly used in potato processing means. Inthe potato starch production process, will produce large amounts of potato slag andindustrial waste, if you do not use the appropriate means to deal with, it will causeserious environmental pollution, but also a waste of resources. Therefore, the studyof potato residue treatment and recycling, to reduce environmental pollution andimprove the economic value of potatoes is important.Potato residue production cell protein feed, is a high economic value of potatoresidue treatment and resource use patterns. In this process, dewatering cell proteinfeed is an important process. On the basis of cell protein feed properties and dryingcharacteristics of studies on cell protein feed air drying process was simulated.Paper obtained the following results:Analysis of the gas-flow drying process gas flow characteristics and heattransfer characteristics of particulate phase and the solid particles into accelerationand constant speed movement of the two stages in the drying tube, whereinmovement of the acceleration phase of the optimal drying effect. In the actual dryingprocess, because the particle size, particle shape and other factors need to becorrected. General approach model revealed that describes three gas-solid twotheories, one of the most commonly used Euler-Euler two-fluid model. For acomplete description of the drying process, through user-defined functions writtenin the corresponding mass transfer model, the definition of a two-stage dryingprocess, a mathematical model of air drying process on the two-dimensionalnumerical simulation model of a vertical tube.In equal diameter tubes for drying wet cell protein particles and hot air tosimulate two-phase flow. In setting conditions to obtain the distribution of gas andsolid phase temperature, velocity, pressure, and humidity fields. Our analysis showsthat the solid particles into the dry tube by airflow drag force to make an acceleratedmotion until constant so far. In this stage, the presence of large particles and the airflow rate and the relative temperature, gas-solid mass transfer driving force betweenthe maximum heat transfer between the gas stream and particles up to more than halfof the entire drying process. As the particle motion and pressure of the mixed phasedecreases, reaches a minimum when to exit. Best acceleration phase was driedparticles, with the decrease of the relative velocity and the temperature differencebetween the gas-solid, drying rate is decreased.The drying process in the pulse tube cell protein particles are simulated, also got the temperature, velocity, pressure and humidity of gas-solid in the field.Compared with an equal diameter pipe, after the completion of the acceleratedparticles, larger diameter, gas velocity decreases, the particle velocity decreases;When the particle deceleration process is completed, the diameter becomes smaller,the increasing gas velocity, particle acceleration to continue to do, relative velocitybetween the gas-solid continuous presence, strengthening the driving force of heattransfer, and increased residence time, strengthen the drying effect, under the sameparameters of the material particles final drying is better than equal diameter pipe. Abrief analysis of the impact of various factors on the drying effect of the operation,the temperature rise, raise gas velocity, particle size can be reduced to improve thedrying effect. The higher the initial moisture content of the particles, the dryingeffect is worse, the higher the energy consumption, thus minimizing particle dryingantecedent moisture. |
