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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 18, 2011
Accepted May 11, 2011

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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기류건조기를 이용한 고수분 석탄의 건조 특성

Drying Characteristic of High Moisture Coal using a Flash Dryer

김상도^† 이시훈 임영준 최호경 임정환 전동혁 유지호

Sang Do Kim^† Si Hyun Lee Young Joon Rhim Ho Kyung Choi Jeong Hwan Lim Dong Hyuk Chun Ji Ho Yoo

한국에너지기술연구원 청정석탄센터, 305-343 대전광역시 유성구 가정로 152

Clean Coal Center, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Deajeon 305-343, Korea

sdkim@kier.re.kr

Korean Chemical Engineering Research, February 2012, 50(1), 106-111(6), NONE Epub 2 February 2012

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Abstract

5 kg/hr 벤치규모 기류건조기를 이용한 고수분 석탄의 건조 특성을 알아보았다. 도착시료 기준으로 원료 석탄의 수분 함량 및 발열량은 각각 29.74 wt%, 4,270 kcal/kg이다. 가스유입온도 및 가스유입속도는 각각 400~600 ℃ 및 10~20m/sec이다. 원료 석탄의 입자크기는 100~2,000 μm로 분쇄 및 분급하였다. 원료석탄의 수분제거율은 가스유입온도는 증가하고 가스유입속도는 감소할수록 급격하게 증가하였다. 건조석탄의 발열량은 5,100~5,900 kcal/kg으로 증가하였다. 기류건조를 통한 고수분 석탄 표면에서의 발생하는 화학적인 변화를 알아보기 위하여 FT-IR 스펙트럼 분석을 실시하였다. 그 결과 하이드록실, 카르복실 및 카보닐 피크에서 주요한 변화가 일어나는 것을 확인할 수 있었다.

Drying characteristic of high moisture coal using a 5 kg/hr bench scale flash dryer was investigated. Moisture content and heating value of raw coal as received basis were 29.74 wt% and 4,270 kcal/kg, respectively. Gas inlet temperature and gas inlet flow rate were 400~600 ℃ and 10~20 m/sec, respectively. The raw coal was ground and classified to the particle size range of 100~2,000 μm. The moisture removal rate of raw coal was dramatically increased with_x000D_ increasing gas inlet temperature and decreasing gas inlet flow rate. The heating value of dried coal was increased to 5,100~5,900 kcal/kg. To examine the chemical change on the surface of high moisture coal during flash drying process, FTIR spectral analysis was carried out. As a result, major changes in hydroxyl, carboxyl and carbonyl peak was confirmed.

Keywords

High Moisture Coal Drying Flash Dryer Moisture Removal Heating Value

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