کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6634368 461106 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct optical observation of coal particle fragmentation behavior in a drop-tube reactor
ترجمه فارسی عنوان
مشاهده نوری مستقیم از رفتار شکستن ذرات ذغال سنگ در یک راکتور قطره ای لوله
کلمات کلیدی
زغال سنگ، تکامل دادن، مشاهدات در محل، سرعت گرمای ذرات، زمان اقامت ذرات، تکه تکه شدن اولیه،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
An experimental plant - called Single Particle Disintegrator (SPaltor) - is presented that allows an observation of coal particle fragmentation during the thermochemical conversion process. The SPaltor is a lab-scale drop-tube reactor which runs at atmospheric pressure and temperatures up to 1600 °C. A high-speed camera, a long-distance microscope, and a high-power LED outside the reactor in combination with two mirrors arranged inside the reactor in a 45°-position are used to monitor the inside of the reactor. In this setup, the particle behavior of three different feedstocks were recorded at nitrogen atmosphere. Two recordings are presented in this paper for a reactor temperature of 1400 °C. While a brown coal particle shows no fragmentation, but a bright gas tail due to devolatilisation, an anthracite particle disintegrates into smaller fragments in the first third of the heated zone. For detailed investigation of primary fragmentation, three non-swelling feedstocks were used: A brown coal from Germany, a high-volatile bituminous coal from South Africa, and an anthracite from Germany. Two key figures were used for the description of fragmentation behavior: Fragmentation probability and fragmentation number. The influences of temperature (800-1400 °C), particle size (0.8-3.15 mm), reactor height (0-90 cm), and calculated residence time (0.25-0.5 s) were investigated. Increasing these parameters led to an increase of fragmentation of the anthracite and the high-volatile bituminous coal. In contrast, fragmentation was never observed for the brown coal in any experiment. For the chosen particle sizes, the residence time in the heated zone is smaller than 0.5 s and comparable to free-fall conditions. The heating rate referring to the particle center varies heavily with particle size and coal type.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 166, 15 February 2016, Pages 382-391
نویسندگان
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