کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10274803 461725 2011 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Calorimetric investigation of chemical additives affecting oxidation of coal at low temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Calorimetric investigation of chemical additives affecting oxidation of coal at low temperatures
چکیده انگلیسی
Interactions in the system “coal-chemical additive-oxygen” were studied at the temperature 30 °C with the aim of recognising inhibitors of the coal oxidation process that are able to modify the coal surface in a chemical way. Three coals of different ranks were tested. As possible inhibitors, 14 aqueous solutions (10 wt.%) of both inorganic (chlorides, sulphates, nitrates, phosphates, and sulphites) and organic (formates, acetates, urea, and thiourea) substances were examined. The action of additives on coal was evaluated from the heat effect during immersion of the coal in the additive solution. It was found that most of the studied substances proved immersing heats quite comparable with that of pure water. However, rather a chemical action was ascertained for sodium sulphite, phenol, urea and/or thiourea with heat effects several times exceeding heats for pure water. To quantify oxyreactivity of original coals as well as additive-treated ones, oxidation heats were measured by the pulse flow calorimetric method. Urea was found to be the chemically acting additive with the most significant inhibiting efficiency (up to 70%) of coal oxidation at low temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel Processing Technology - Volume 92, Issue 3, March 2011, Pages 712-715
نویسندگان
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