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Article
Sulfur Dioxide Removal in Coal Slurry Reactor

Authors: Neran K. Ibrahim --- Zainab A. Jawad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2008 Volume: 26 Issue: 4 Pages: 462-477
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The objective of this work was to study the feasibility of using coalslurry for the removal of SO2 from simulated flue gas stream (air,SO2). The effect of gas rate, temperature, and initial SO2concentration on the overall removal efficiency was investigated atwet and dry bed conditions. The results indicated that the optimumgas rate was 60 l /min. The SO2 removal efficiency was highlytemperature sensitive, and increases with increasing the bedtemperature especially at wet bed conditions and decreases withincreasing SO2 initial concentration. A mathematical model for thedesulfurization process was proposed based on the material balancefor gaseous and solid phase streams. The model was found to give avery good description of the experimental data with 95% confidencelevel.

يهدف البحث الى دراسة جدوى أستخدام الفحم ال  منشط في وسط ُثلاثي الأطوار لازالةثنائي اوكسيد الكبريت من مجرى غازي محاكي لمجرى غازات مدخنة(هواء ,ثنائياوكسيد الكبريت ). لقد تم دراسة تاثير كل من نسبة تدفق الغاز, درجة الحرارة وتركيزالغاز الابتدائي على كفاءة الازالة الكلية في حالة الحشوه الرطبه و الجافه . النتائجاشارت الى ان معدل تدفق الغاز المثالي هو 60 لتر/دقيقة. كفاءة ازالة ثنائي اوكسيدالكبريت تتاثر كثيرا بدرجة الحرارة حيث تزداد بزيادة درجة الحراره خصوصا فيحالة الحشوة الرطبة و تقل بزياده تركيز غاز ثنائي اوكسيد الكبريت الأبتدائي. تم اعدادموديل رياضي يصف عملية الأزاله. الموديل الرياضي ال  مقترح أُسس على موازنةالماده لكل من الغاز والصلب. الموديل أعطى وصف جيد جدًا للنتائج العمليه وبمقدار.% ثقة 95


Article
Removal of SO2 in Dry Fluidized and Fixed Bed Reactors using Granular Activated Carbon

Authors: Neran K. Ibrahim --- Omar A. Jabbar
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 14 Pages: 3019-3037
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Flue gas desulfurization process has been studied using granular activated carbon in bubbling fluidized bed reactor. For the sake of comparison, fixed bed configuration has been also studied at the same operating conditions. The effect of temperature 30 . T . 80 oC, inlet SO2 concentration 500 . Co . 2000 ppm, and flue gas flow rate 2.5 .Q . 30 ./min were investigated. The results showed that the SO2 removal efficiency increases with increasing reaction temperature up to 80 oC. Also, it was noted that the removal efficiency decreases with increasing the inlet SO2 concentration within the range of temperatures studied. The effect of flue gas flow rate on the desulfurizationactivity was in two ways; an increase in the removal efficiency with increasing gas flow rate was observed below flow rate = 7.5 ./min, while a decrease in the efficiency was observed upon any increment in the gas flow rate beyond the 7.5 ./min. The results of fluidized bed reactor were used to obtain an empirical correlation and the experimental results were well correlated with the proposed formwith a correlation coefficient, (R) =0.989. A reaction rate equation was proposed for the oxidative desulfurization and the activation energy was obtained using differential analysis of integral reactor technique. The resulted value of apparent activation energy was 2.981 kJ/mol.


Article
Removal of SO2 over Modified Activated Carbon in Fixed Bed Reactor: I, Effect of Metal Oxide Loadings and Acid Treatment

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Abstract

The removal of SO2 from simulated gas stream (SO2 + air) in a fixed bed reactor using Modified Activated Carbon (MAC) catalysts was investigated. All the experiments were conducted at atmospheric pressure, initial SO2 concentration of 2500 ppm and bed temperature of 90oC. MAC was prepared by loading a series of nickel and copper oxides 1, 3, 5, 7, and 10 wt% on AC. In some of the experimental runs, the original activated carbon was pretreated with two different concentrations of nitric acid 10 and 45 wt%. The results showed that the SO2 removal efficiency, breakthrough time (τ0.05) and sorption capacity increase with increasing metal oxides loadings up to a value of 7 wt% beyond which the desulfurization performance decreases. The pretreatment of the original AC with HNO3 enhanced the removal efficiency of SO2. The copper supported catalysts showed higher flue gas desulfurization activity as compared to the nickel supported catalysts

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