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برج پرشده

نویسنده :eisa 1994
تاریخ:پنجشنبه 1392/01/15-14:08

طرز کار برج های پر شده به همان صورت برج های سینی دار بوده و تفاوت این دو برج را می توان به صورت زیر بیان کرد:همانطور که گفته شد در برج های سینی دار در فواصل معین صفحات سوراخداری قرار داده شده که عمل انتقال جرم بین فازها توسط آن تسهیل می شود. اما در برج های پر شده سینی وجود ندارد بلکه تمام برج از اجسامی با جنس و شکل معین پر شده است که به این اجسام پرکن (Packing) می گویند.
پرکن ها عموماً بر دو نوع منظم و نامنظم تقسیم بندی می شوند؛ پرکن های منظم طی دو دهه اخیر بازار عرضه شده اند که در برخی موارد حتی بر سینی ها نیز برتری دارند. در این برج ها نیز همانند برج های سینی دار مایع از بالا و گاز از پایین جریان پیدا می کند. توزیع مایع در برج های پرکن حائز اهمیت بسیاری است زیرا توزیع


ناهمسان موجب خشک ماندن برخی قسمت های بستر و در نتیجه کاهش راندمان تماس گاز -مایع می شود .به همین خاطر انواع بسیار متنوعی از توزیع کننده ها توسط سازندگان ساخته و به بازار عرضه شده است. جهت نگه داشتن بستر پرکن یک سینی زیرین و برای جلوگیری از انبساط بستر یک سینی بالایی در برج های پرکن تعبیه می شود.(شکل ۱۷ ).

همانطور که گفته شد پرکن ها بر دو نوع منظم و نامنظم تقسیم بندی می شوند که نوع منظم آن دارای مزایای زیر است:
- افت فشار بسیار کمتر در مقایسه با سینی ها
- ارتفاع کمتر به ازاء تبادل جرم مساوی با سینی ها
- قابلیت پاسخگویی به محدوده وسیعی از دبی مایع

پرکن ها باید دارای خصوصیات زیر باشند:
۱ - سطح تماس زیادی بین مایع و گاز ایجاد کنند.
۲ - افت فشار گاز در هنگام عبور از بستر باید کم باشد.
۳ - از لحاظ شیمیایی در مقابل سیالاتی که بکار می روند بی اثر باشند.
۴ - دارای استحکام باشند تا استفاده از آن به آسانی صورت گیرد.
۵ - ارزان قیمت باشد.



نوع مطلب : برج 

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