کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
634625 1456071 2013 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interactions between oxygen permeation and homogeneous-phase fuel conversion on the sweep side of an ion transport membrane
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Interactions between oxygen permeation and homogeneous-phase fuel conversion on the sweep side of an ion transport membrane
چکیده انگلیسی

The interactions between oxygen permeation and homogeneous fuel oxidation reactions on the sweep side of an ion transport membrane (ITM) are examined using a comprehensive model, which couples the dependency of the oxygen permeation rate on the membrane surface conditions and detailed chemistry and transport in the vicinity of the membrane. We assume that the membrane surface is not catalytic to hydrocarbon or syngas oxidation. Results show that increasing the sweep gas inlet temperature and fuel concentration enhances oxygen permeation substantially. This is accomplished through promoting oxidation reactions (oxygen consumption) and the transport of the products and reaction heat towards the membrane, which lowers the oxygen concentration and increases the gas temperature near the membrane. Faster reactions at higher fuel concentration and higher inlet gas temperature support substantial fuel conversion and lead to a higher oxygen permeation flux without the contribution of surface catalytic activity. Beyond a certain maximum in the fuel concentration, extensive heat loss to the membrane (and feed side) reduces the oxidation kinetic rates and limits oxygen permeation as the reaction front reaches the membrane. The sweep gas flow rate and channel height have moderate impacts on oxygen permeation and fuel conversion due to the residence time requirements for the chemical reactions and the location of the reaction zone relative to the membrane surface.


► The oxidation reactions in the gas-phase enable substantial fuel conversion.
► Chemical reactions and heat and mass transfer are important for oxygen permeation.
► The local flow conditions should be accounted for in ITM reactor investigations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 428, 1 February 2013, Pages 309–322
نویسندگان
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