Study On Drying Characteristics And Technology Of Fresh Sesame Residue

Sesame residue is rich in nitrogen,phosphorus,potassium and organic matter,and is a promising protein resource.However,the moisture content of wet sesame residue is too high to store.At present,the drying of wet sesame residue mainly uses artificial drying methods,there are many influencing factors,not only waste resources,pollute environment,but also increase labor costs.It is difficult to produce on a large scale.To achieve the efficient use of sesame protein,drying has become a problem that needs to be solved.In this paper,the drying process of wet sesame residue is studied,the drying curve of wet sesame residue is analyzed,and the effective water diffusion coefficient and apparent activation energy are calculated.The effect of different factors on the drying process is investigated,the surface microstructure of sesame residue particles under different drying conditions is analyzed,and the spray bed drying technique is applied to the drying of wet sesame residue particles.The effect of temperature on the drying process of wet sesame residue particles is analyzed through drying experiments under different temperature conditions.The drying curve is obtained and it is found that,in the range of 50?to 120?,when the drying temperature is below 100?,the increase of temperature can effectively speed up the drying rate,thus playing a role in shortening the drying time,but above 100?,the warming can not have a significant effect.By calculating moisture diffusion coefficient in condition of drying,the effective moisture diffusion coefficient increase from 5.47×10^-10m²/s to 4.286×10^-9m²/s as the drying temperature increased from 50?to 120?,The apparent activation energy Ea during the drying process has a value of 32.84 k J/mol.Compare the amino acid changes of sesame residue after drying at different temperatures of50?and 120?,and analyze the effects of drying temperature from the perspective of protein nutrient composition.The amino acid composition does not change much,and basically does not cause the loss of arugin nutrients.Through the single factor experiments of different drying conditions,it is found that the drying process of the wet sesame residue particles is greatly affected by the particle size and temperature,and the loading quantity is less.The higher the temperature,the smaller the particle size,and the faster the drying rate,the shorter the drying time.However,with the increase of drying temperature,the particle size decreases,the drying rate increases more and more slowly,and the drying time is less and less obvious.Through the experiment of different drying conditions and the fitting parameters and correlation test of different drying mathematical models,the results show that the Midilli-Kucuk model(MR=a₀exp((-kt)ⁿ)+bt)is the most suitable to describe the drying process of wet sesame residue particles.After observing the surface structure of particles under different temperatures and particle sizes after drying,it can be seen that the increase in temperature increases the number of water molecule diffusion channels,and the decrease in particle size increases the width of water channels.The drying experiment of wet sesame particles in spouted bed found that the temperature can effectively increase the drying rate of sesame particles and accelerate the drying process.The increase of the dry and wet ratio can shorten the time of the injection cycle.Moreover,within a certain range,the increase in the amount of drying makes the collision of solid particles more intense and easier to break,the contact area between gas solids increases,the solid mass transfer between particles,and the gas-solid mass transfer between gases and particles is more adequate.