کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1270397 1497391 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetics of steam gasification of in-situ chars in a micro fluidized bed
ترجمه فارسی عنوان
سینتیک گازسنجی بخار از مکان های درون یک ردیف میکروسکوپی
کلمات کلیدی
گازی کردن بخار، در محل کاراکتر، بستر میکروسیلیس واکنش پذیری، جنبش
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• Steam gasification of in-situ char was conducted in a micro fluidized bed reactor.
• Method avoided mutation effects and measured gasification efficiently and reliably.
• Gasification is well described by shrinking core and random pore models.
• Absolute conversion is used for kinetic calculations to avoid mutation effects.
• Ex-situ chars are less reactive than in-situ chars.

In-situ char steam gasification was conducted using a multistage in-situ reaction analyzer based on a micro fluidized bed. Rapid pyrolysis was activated when pulverized coal was injected into the micro fluidized bed reactor. The temperature was adjusted to the gasification temperature, which was not higher than the pyrolysis temperature. In-situ char gasification was initiated by switching the atmosphere from Ar to H2O/Ar. The procedure avoided mutation effects and monitored in-situ reactions reliably and efficiently. Char was not completely gasified below 1000 °C. The kinetic parameters calculated from relative or absolute conversions differed from each other. Absolute conversion avoided mutation effects. Gasification accelerated with increasing steam concentration from 15% to 25% but was constant from 25% to 45%. The rate constants for in-situ char were preferable for determining in-situ reactivity. Ex-situ chars were less reactive than in-situ chars. Deactivation of highly reactive char was sensitive to cooling and reheating.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 34, 14 September 2016, Pages 15187–15198
نویسندگان
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