논문 해외 국제전문학술지(SCI급) EVALUATION OF A HOT OIL IMMERSION DRYING METHOD FOR THE UPGRADING OF CRUSHED LOW-RANK COAL
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2012-04
- 저자명 엄태인
- 학술지명 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
- 발행처명 KOREAN SOC MECHANICAL ENGINEERS
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
Coal is the most abundant fuel on earth, and low-rank coal (LRC) such as sub-bituminous coal and lignite makes up about half ofall coal deposits. LRC: is inconvenient to use due to its low caloric value and high content of moisture together with the strong tendency of spontaneous combustion due to these oxygen rich coals, etc. S olving these problems would substantially improve the efficiency of LRC usage. In this study, we describe a drying technique utilizing hot oil immersion. This upgrading process may be executed easily un der relatively low temperature condition due to the difference of heat capacity and thereby pressure gradient between coal and he ating oil. This results in greatly reducing its energy cost. Drying t ests of Indonesian lignite were performed with refined waste oil a nd B-C heavy oil, which were heated to 120 degrees C, 130 degrees C or 140 degrees C. Following 10 min of treatment, the moisture content of the upgraded coal was improved from 32% to 2.0-3.2%, and its high heat ing value from 3,000 kcal/kg to 6,000 kcal/kg.