کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
209211 461660 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of ash layer in syngas combustion in underground coal gasification
ترجمه فارسی عنوان
نقش لایه خاکستر در احتراق سینگاس در گازسیون ذغال سنگ زیرزمینی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• An assembly is designed to study one-dimension gasification of a coal char.
• The ash layer provides a space for reaction of O2 + CO and increases CO2 yield.
• The CO combustion in ash layer raises temperature and leads to ash melting.
• The molten ash increases the mass transfer resistance of the gas components and decreases the gasification rate.

Underground coal gasification (UCG) proceeds generally in the presence of an ash layer on the coal (or char) surface. The ash layer would not only increase the mass transfer resistance to gases as reported in the literature but also lead to reactions of O2 with syngas (CO and H2) generated from the ash–char interface. This paper studies the effects of ash layer in a specially designed one-dimension gasification assembly using a bituminous coal char by analyzing the ash and the gases components. The ash content of the char is 26.3 wt.% and the deformation temperature (DT) is 1460 °C. It is found that at 1300 °C the ash layer does not reduce the O2 mass transfer until it is thicker than 1.3 mm. The ash layer, however, allows O2 to react with CO generated from the ash–char interface to form CO2, which raises the local temperature in the ash layer leading to local ash melting and transfers the char reaction from partial oxidation by O2 in the absence of an ash layer to the Boudouard reaction, i.e. between char and CO2.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel Processing Technology - Volume 143, March 2016, Pages 169–175
نویسندگان
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