پديد آورنده :
اكبري، حميدرضا
عنوان :
بهينه سازي فرآيند خشك كردن خمير مايه در خشك كن پيوسته بستر سيال
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي
صفحه شمار :
سيزده، 96، [II]ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
محمد جعفر طاهر زاده، كيخسرو كريمي
توصيفگر ها :
مخمر نانوايي , فرمانتور , گرانولها , محلول امولسيفاير
تاريخ نمايه سازي :
8/2/87
استاد داور :
احمد محبي، محمد فضيلتي
تاريخ ورود اطلاعات :
1396/03/08
رشته تحصيلي :
مهندسي شيمي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
AbstractInstant active dry baker s yeast is a well known product widely used for leavening of bread Theyeast produced by fermentation is usually dried by hot air to 94 96 dry matter content Nowadays several drying methods are used in industry in which multi stage fluidized beddrying process is considered as an effective method for the yeast drying Temperature andretention time in each stage significantly affect the final activity of the yeast High temperaturesshould be avoided during drying in order to maintain the activity In this study optimal operating parameters of an industrial continuous fluidized bed drier forproduction of instant active dry yeast were investigated The operating conditions such astemperature loading rate of compressed yeast granules and hot air humidity had direct effectson the yeast activity and viability of the product The dryer had 4 zone separated with movingweirs The most important factor that affected the quality of the product was the operationaltemperature in each zone on the bed Optimization was performed for three loading rates of thefeed to the dryer using Taguchi method for the experimental design The samples werewithdrawn from each zone of the dryer after reaching steady state conditions and analyzed withrespect to the fermentation activity that is the leavening ability of CO2 production of yeast cellsin dough by CO2 evolution method using a fermentograph recorder viability by methyleneblue method and the dry substance The highest fermentation activity for 300 350 and 400 kg h loading rate were found to be 620 655 and 640 Cm3 CO2 h respectively The average activity value obtained at 630 Cm3 CO2 h where the average viability of the cells was 67 74 and 71 at the end of the dryer The resultsshowed that if the operational temperature of zones 1 2 3 and 4 controlled at 33 31 31 and29 C the product reach the best activity of 650 Cm3 CO2 h and the highest viability of 76
استاد راهنما :
محمد جعفر طاهر زاده، كيخسرو كريمي
استاد داور :
احمد محبي، محمد فضيلتي
