کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
208395 461248 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of kinetic model for the reaction between SO2/NO and coal fly ash/CaO/CaSO4 sorbent
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Development of kinetic model for the reaction between SO2/NO and coal fly ash/CaO/CaSO4 sorbent
چکیده انگلیسی

Sorbents for semidry-type flue gas desulfurization (FGD) process can be synthesized by mixing coal fly ash, calcium oxide, and calcium sulfate in a hydration process. As sorbent reactivity is directly correlated with the specific surface area of the sorbent, reacting temperature, concentration of the reacting gas species and relative humidity, two major aim in the development of a kinetic model for the FGD process are to obtain an accurate model and at the same time, incorporating all the parameters above. Thus, the objective of this work is to achieve these two aims. The kinetic model proposed is based on the material balance for the gaseous and solid phase using partial differential equations incorporating a modified surface coverage model which assumes that the reaction is controlled by chemical reaction on sorbent grain surface. The kinetic parameters of the mathematical model were obtained from a series of experimental desulfurization reactions carried out under isothermal conditions at various operating parameters; inlet concentration of SO2 (500 ppm ⩽ C0,SO2C0,SO2 ⩽ 2000 ppm), inlet concentration of NO (250 ppm ⩽ CO,NO ⩽ 750 ppm), reaction temperature (60 °C ⩽ T ⩽ 80 °C) and relative humidity (50% ⩽ RH ⩽ 70%). For a variety of initial operating conditions, the mathematical model is shown to give comparable predictive capability when used for interpolation and extrapolation with error less than 7%. The model was found useful to predict the daily operation of flue gas desulfurization processes by using CaO/CaSO4/coal fly ash sorbent to remove SO2 from flue gas.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 87, Issues 10–11, August 2008, Pages 2223–2228
نویسندگان
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