دورات هندسية

 

 

صودا

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  1. [1]
    عبدالكريم
    عبدالكريم غير متواجد حالياً

    عضو

    تاريخ التسجيل: Dec 2005
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    صودا

    ابحث لمساعدة عن كيفية تحويل الصودا السائلة الى صلبة..........شكرا

    من مواضيع عبدالكريم :


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  2. [2]
    volcaniquo
    volcaniquo غير متواجد حالياً
    عضو فعال


    تاريخ التسجيل: Aug 2009
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    وانا كمان والله شكرا لطرح الاشكال

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  3. [3]
    عبدالكريم
    عبدالكريم غير متواجد حالياً
    عضو


    تاريخ التسجيل: Dec 2005
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    صودا(هيدروكسيد الصوديوم )

    السلام عليكم

    ابحث لمساعدة عن كيفية تحويل الصودا السائلة الى صلبة

    مع الشكر والتقدير

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  4. [4]
    chemicaleng
    chemicaleng غير متواجد حالياً
    عضو متميز
    الصورة الرمزية chemicaleng


    تاريخ التسجيل: Mar 2010
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    انواع المجففات

    السلام عليكم ورحمة اللة وبركاتة
    الاخ الفاضل لو لاحظت انواع الصودا الكاوية الموجودة بالاسواق ستلاحظ وجود نوعين هما :
    - نوع مثل القشور وهذا النوع تم تجفيفة بواسطة ال (DRUM DRYERS / FLAKER ) وهى طريقة برميل التجفيف .
    - نوع محبب وتم تجفيفة بواسطة ال ( spray dryer ) وهو المجفف الرذاز او المذرر ومنة انواع عديدة .
    وانواع المجففات هى كالتالى :
    Types of dryers:
     Air Dryers: used with compressors to remove the moisture from the compressed air. These can be desiccant type or refrigerated. Measured by CFM.
     Conveyor Dryers: These are continuous dryers that have a trough with a screw conveyor or paddle conveyor inside the trough. Typically the trough and the screw are heated. They may or may not have a cover that so you can dry under a vacuum. Measured by the width and length of the trough and number of conveyor screws.
     Drum Dryers: These have a heated drum or set of 2 drums where the product is distributed on the outside of the drum and dries as it rotates slowly toward a scraping blade which scrapes the dry product off the outside of the drum. These are good for milk drying, and cereals. Same as drum flakers which are cooled. Measured by the diameter and length of the drum.
     Fluid Bed Dryers: Can be batch or continuous. The product flows across a perforated bed in the dryer. Hot air is blown up through the perforated bed causing the product to flow in the air stream. Continuous beds vibrate to move the product through the dryer. Batch type have agitator to keep the product moving through the air stream. Found mostly in pharmaceutical plants. Measured by the Kg/Hr.
     Flash Dryers: Also called a pneumatic conveyor dryer, where the product is conveyed through a heat source and pulverizers before it is discharge through some type of air classifier. Measured by the CFM of the air flow though the dryer.
     Flakers or Belt Dryers: The product is distributed on a long continuous belt which passes through a heated chamber long enough to dry the product during it travel time though the chamber. Belt flakers are a solid belt which is cooled so the product dries or hardens and flakes off the belt at the end of the flaker. Measured by the diameter and length of the belt.
     Freeze Dryers (Lyophilizers): This is a low temperature batch dryer that has a vacuum rated housing with heated or cooled shelves inside. The product is spread onto trays that are inserted onto the shelves. Once the shelves are full the door to the dryer is closed until the drying process is complete. The identical to a shelf dryer except the product is processed under low temperatures. Many times vials filled with a pharmaceutical injectable medicine and a stopper on top are process in this dryer. When the process is complete the shelves compress to press the stoppers into to vials to completely seal them before leaving the dryer for sanitary reasons. Measured by the Square Foot of the shelves.
     Oven Dryers: Heated boxes that are either hot air or steam heated. Can be atmospheric pressure. Measured by the internal dimensions of the chamber.
     Porcupine Dryers: Special type of conveyor dryer with a trough and a special designed internal screw conveyor. Can be jacketed, and rated for internal pressure. Measured by the model number.
     Rotary Dryers: Rotary dryers are large long cylindrical tubes that rotate on external tires and trunnions, and hot air or direct flame is fired though the inside of the tube to dry the product as it tumbles its way through the rotating tube. Measured by diameter and length.
     Steam Tube Dryers: Same as a rotary dryers, except this dryer has internal steam heated tubes to dry the product as it tumbles through the rotating dryer housing tumbling over the outside of the steam heated tubes. Measured by the diameter and length.
     Shelf: This is a batch dryer with a square vacuum rated housing with internal heated shelves. Product is spread onto trays which are loading into the dryer on the shelves. Similar to a Lyophilize except this dryer is rated for heating only and does not have movable shelves. These are measured by the Square Foot Surface area of the shelves.
     Spray Dryers: This type of dryer has a large vertical chamber, measured by the diameter of the chamber, with either a co-current or counter current hot air flow through the chamber. A liquid product is fed into the top of the dryer chamber by a fast spinning wheel that atomizes the liquid into a fine spray. As the spray floats down though the hot air stream it dries into fine partials. Typical applications include Instant milk, instant tea, and powdered pigments.

    واللة الموفق

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  5. [5]
    agabeain
    agabeain غير متواجد حالياً
    عضو فعال جداً
    الصورة الرمزية agabeain


    تاريخ التسجيل: Dec 2009
    المشاركات: 162
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    وفقك اللة

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