Preparation and Characterization of the Glycerol-Embedded Hybrid Coal
- Authors
- Park, Ju-Hyoung; Lee, Dong-Wook; Lee, Young-Joo; Song, Gyu-Seob; Jin, Min-Ho; Park, Se-Joon; Namkung, Hueon; Bae, Jong-Soo; Kim, Joeng-Geun; Song, Kwang Ho; Choi, Jong Won; Choi, Young-Chan
- Issue Date
- 4-3월-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Glycerol; Sulfuric acid; Torrefaction; Hybrid coal; Coal upgrade; Unburned carbon
- Citation
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v.7, no.5, pp.4637 - 4646
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING
- Volume
- 7
- Number
- 5
- Start Page
- 4637
- End Page
- 4646
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/67014
- DOI
- 10.1021/acssuschemeng.8b03818
- ISSN
- 2168-0485
- Abstract
- The The molasses embedded hybrid coal (Hybrid Coal by Korea Institute of Energy Research; HCK) was previously proposed as an attractive alternative to low-rank coals that tend to show low calorific values and high CO2 emissions. HCK was synthesized by mixing molasses with a low-rank coal to enhance its heating value. Nevertheless, food ethics regarding molasses additives still have impeded its commercial acceptance. In this study, we propose a glycerol (nonfood)-based coal upgrading process to improve the combustion kinetics and heating value of hybrid coal in comparison to the previous HCK. The process involves drying at 105 degrees C followed by torrefaction process at 250 degrees C. During torrefaction, the glycerol additive starts to evaporate at about 180 degrees C and then is almost vaporized out to the coal surface. To avoid glycerol loss, we employ sulfuric acid as a torrefaction catalyst to suppress glycerol evaporation. In comparison to the molasses yield of 65% after torrefaction in the previous HCK synthesis process, glycerol-embedded torrefaction with sulfuric acid showed a 55% yield in mass. The glycerol embedded hybrid coal shows a homogeneous combustion peak regardless of the mixing ratios, leading to a 35% reduction of unburned carbon emissions, which is one of the particular matter sources of combustion flue gas. Furthermore, the proposed synthesis process increases the net caloric value to 80% and lowers the water uptake to 84%, even without a higher SO2 emission, in comparison with raw coal.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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