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http://dx.doi.org/10.3795/KSME-B.2013.37.4.405

Char Oxidation Characteristics of High Ash Coal in Drop Tube Furnace  

An, Ke-Ju (School of Mechanical Engineering, Pusan Nat'l Univ.)
Lee, Byoung-Hwa (Pusan Clean Coal Center)
Kim, Sang-In (School of Mechanical Engineering, Pusan Nat'l Univ.)
Kim, Man-Cheol (Korea Southern Power Company (KOSPO))
Kim, Seung-Mo (Pusan Clean Coal Center)
Jeon, Chung-Hwan (School of Mechanical Engineering, Pusan Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.4, 2013 , pp. 405-413 More about this Journal
Abstract
The char oxidation characteristics of high ash coal were experimentally investigated at several temperatures (from 900 to $1300^{\circ}C$) for 4 types of coals (Gunvor, Glencore, Noble, and ECM) under atmospheric pressure in a drop tube furnace (DTF). The char reaction rate was calculated from the exhaust gas concentrations (CO and $CO_2$) using FT-IR, and the particle temperature was measured using the two-color method. In addition, the activation energy and pre-exponential factor for high ash coal char were calculated based on the Arrhenius equation. The results show that as the ash content increases, the particle temperature and area reactivity decreases. This is because in high ash coal, the large heat capacity of the ash, ash vaporization, and relatively low fixed carbon content of ash suppress combustibility during char oxidation. As a result, the higher ash content of coal leads to high activation energy.
Keywords
High Ash Coal; Particle Temperature; Char Oxidation Rate; Activation Energy;
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