Control and Simulation of Fluidized Catalytic Cracking Unit

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

Fluid catalytic cracking is now a major secondary conversion process in petroleum refinery. The main objective is the conversion of straight-run atmospheric gas oils, vacuum gas oils, certain atmospheric residues and heavy stocks recovered from other refinery operations into high-octane gasoline, light fuel oils and olefin-rich light gases. Simultaneously with the desired reactions, coke, carbonaceous material having low ratio of hydrogen to carbon (H/C) deposits on the catalyst and renders it less catalytically active. This study has tried to control spent catalyst and the converted products which are separated. The catalyst passes to a separation chamber. The regenerator; where the coke is combusted to rejuvenate the catalyst. The rejuvenated catalyst then passes to the bottom of the reactor riser, where the cycle begins again. FCC has many parameters to control; the most important are temperature of the reactor, the level and flow rate of the catalyst. The temperature of the reactor should be kept at 505 ͦ C and the catalyst temperature 655 ͦC. The control strategy was developed and the transfer functions were identified. From these transfer functions the characteristic equations were calculated as well as the open- loop transfer functions. Routh direct substitution, Root – Locus and bode methods were used for tuning, stability analysis and simulation response of the system with adjustable parameters. The obtained results for loop one are Kc = 4.56, Ʈi = 8.2min, Ʈ d = 1.2min. The systems simulation results were found to be initially oscillatory and finally settled. From the response the following parameters were determined for loop1 these are: peak time =3.5 sec, over shoot = 0.373, decay ratio 0.391, settling time =73 sec and rise time 7.21 sec. Peak time 00.18 sec, over shoot 5.9, decay ratio 0.395settling time =6.08 sec and rise time 0.478 for loop2. Whereas, peak time 2.31sec, over shoot 0.489, decay ratio 0.342, setting time =40.1 sec and rise time of 4.78 for loop3. But, peak time of 2 sec, over shoot 0.54, decay ratio 0.319, setting time =29 sec and rise time of 3.76 for loop4. This means that the stability and tuning methods give almost equal results showing that the average leads to more accurate results. For future study, it is recommended that the control system should be analyzed by using ASPENHYSYS process simulator and compare its results with results of MATLAB software application which is used in this study. It is recommended that the control system in this unit should always be renewed by other controllers as those types of controllers which can adapt themselves according to the change of catalyst activity, temperature and pressure.

روابط وملفات

التعريف والنوع

رقم الوثيقة

03a0908b-a8a9-4e43-8b4e-b95bf2463368

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

73699_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Gurashi Abdullah Gasmelseed","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Mustafa Ohaj Mohamed ","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"أحمد بدرالدين محمد جبريل ","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Control and Simulation of Fluidized Catalytic Cracking Unit

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Gurashi Abdullah Gasmelseed, Mustafa Ohaj Mohamed

الإعداد

أحمد بدرالدين محمد جبريل

الاقتباسات الببليوغرافية