پایان نامه شبیه سازی CFD جذب CO2 از گاز سنتز بوسیله غشای الیاف توخالی

فهرست:

فصل 1: مقدمه و کلیات تحقیق... 1

1-1- کلیات.... 2

1-1-1- فرآیندهای جداسازی.... 2

1-1-2- تعریف غشا 2

1-1-3- مواد تشکیل دهنده غشا 4

1-1-4- انواع فرآیندهای غشائی.... 4

1-1-5- تماس دهنده غشائی الیاف توخالی.... 8

1-2- تشریح مسئله.. 9

1-3- ضرورت تحقیق در این زمینه.. 10

1-4- مزایا و معایب تماس دهنده های غشائی.... 12

1-5- اهدف شبیه سازی.... 13

فصل 2: ادبیات و پیشینه تحقیق... 15

2-1- مقدمه.. 16

2-2- تاریخچه  جداسازی بوسیله ی غشا 17

2-3- پیشینه تحقیق در زمینه غشا 18

2-3-1- مطالعات آزمایشگاهی.... 19

2-3-2- مطالعات تئوری.... 20

2-3-3- مطالعات بر روی مدل سازی و شبیه سازی مسئله.. 22

فصل 3: روش تحقیق... 24

3-1- مقدمه.. 25

3-1-1- دینامیک سیالات محاسباتی (CFD) 25

3-1-2- تعریف..... 25

3-1-3- کاربرد.. 26

3-1-4- مزایا 27

3-1-5- معایب..... 27

3-2- بخش های مختلف شبیه سازی یک مسئله با تکنیک CFD... 28

3-2-1- پیش پردازنده. 28

3-2-2- حل کننده. 29

3-2-3- پس پردازنده. 29

3-3- آشنایی با نرم افزار Comsol Multiphysics. 30

فصل 4: مدل سازی غشائی... 31

4-1- مقدمه.. 32

4-2- معادلات حاکم.. 33

4-2-1- جریان حلال درون لوله.. 34

4-2-2- جریان حلال درون پوسته.. 41

4-3- توزیع سرعت..... 47

4-3-1- توزیع سرعت بخش لوله.. 47

4-3-2- توزیع سرعت بخش پوسته.. 47

4-4- سرعت واکنش شیمیایی.... 48

فصل 5: ارزیابی مدل و تجزیه تحلیل نتایج... 49

5-1- مقدمه.. 50

5-2- داده های ورودی ثابت..... 50

5-3- داده های ورودی محاسبه شده. 51

5-3-2- شعاع فرضی.... 52

5-3-3- انحنا 53

5-3-4- غلظت های ورودی  در مخلوط گازی و محلول آبی.... 54

5-3-5- ضرایب نفوذ.. 55

5-4- یافته های بدست آمده از شبیه سازی.... 55

5-4-1- اعتبار سنجی مدل... 57

5-4-2- شماتیک توزیع غلظت  در تماس دهنده ی غشائی الیاف توخالی.... 60

5-4-3- پروفایل سرعت در تماس دهنده های غشائی الیاف توخالی.... 70

5-4-4- پروفایل غلظت شعاعی اجزا 74

5-4-5- پروفایل غلظت محوری اجزا 77

5-4-6- بررسی شماتیک تاثیر افزایش شدت جریان حجمی حلال بر  روی توزیع غلظت دی اکسید کربن و مونو اتانول آمین................................... 80

5-4-7- بررسی درصد حذف دی اکسید کربن.... 83

5-4-8- تاثیر مقدار تخلخل بر غلظت دی اکسید کربن خروجی از جریان گاز. 85

5-4-9- تاثیر تغییر ضخامت غشا بر روی غلظت دی اکسید کربن خروجی از جریان گاز  86

5-4-10- تاثیر تغییر شعاع داخلی لیف بر روی غلظت دی اکسید کربن خروجی از جریان گاز  87

5-4-11- تاثیر تعداد لیف ها بر غلظت دی اکسید کربن خروجی از جریان گاز  88

5-4-12- مقایسه محلول آبی مونو اتانول آمین با سایر حلال ها 89

5-4-13- تاثیر شدت جریان مخلوط گاز. 94

5-4-14- تاثیر دما بر روی عملکرد سیستم.. 95

5-4-15- مش بندی سیستم.. 97

فصل 6: نتیجه گیری و پیشنهادات.... 100

6-1- مقدمه.. 101

6-2- نتایج بدست آمده در حالت جریان حلال در بخش لوله.. 101

6-3- نتایج بدست آمده در حالت جریان حلال در بخش پوسته.. 102

6-4- پیشنهادات برای پژوهش های آینده. 103

فصل 7: مراجع.. 104

فصل 8: پیوست‌ها 110

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