Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Hydrochar Production from Kenaf via Hydrothermal Carbonization: Effect of Process Conditions on Hydrochar Characterization

열수탄화를 통해 kenaf로부터 hydrochar생산과 공정 조건에 따른 hydrochar 특성에 끼치는 영향

  • Youn, Hee Sun (Department of Food Biotechnology and Chemical Engineering and Interagency Convergence Energy on New Biomass Industry, Hankyong National University) ;
  • Um, Byung Hwan (Department of Food Biotechnology and Chemical Engineering and Interagency Convergence Energy on New Biomass Industry, Hankyong National University)
  • 윤희선 (한경대학교 식품생명화학공학부 화학공학전공, 거대억새에너지사업단) ;
  • 엄병환 (한경대학교 식품생명화학공학부 화학공학전공, 거대억새에너지사업단)
  • Received : 2021.10.22
  • Accepted : 2021.11.30
  • Published : 2022.02.10
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Abstract

The lignite and bituminous coal are mainly used in thermal power plant. They exhaust green house gas (GHG) such as CO2, and become deplete, thus require alternative energy resources. To solve the problem, the hydrochar production from biomass is suggested. In this study, both hydrothermal carbonization (HTC) and solvothermal carbonization (STC) were used to produce high quality hydrochar. To improve the reactivity of water solvent process in HTC, STC process was conducted using ethanol solution. The experiments were carried out by varying the solid-liquid ratio (1:4, 1:8, 1:12), reaction temperature (150~300 ℃) and retention time (15~120 min) using kenaf. The characteristic of hydrochar was analyzed by EA, FT-IR, TGA and SEM. The carbon content of hydrochar increased up to 48.11%, while the volatile matter decreased up to 39.34%. Additionally, the fuel characteristic of hydrochar was enhanced by reaction temperature. The results showed that the kenaf converted to a fuel by HTC and STC process, which can be used as an alternative energy source of coal.

석탄화력발전소들은 여전히 저급 석탄인 lignite와 bituminous coal을 이용한 발전이 이루어지고 있지만, 이는 CO2와 같은 GHG를 배출하는 문제를 유발하고 고갈의 위험성이 있어 이를 대체할 에너지원이 필요하다. 이를 해결하기 위해 바이오매스를 이용한 hydrochar 생산이 주목받고 있다. 본 연구에서는 고품질 hydrochar의 생산을 위해 용매열법을 열수탄화에 적용하여 에탄올 수용액을 기반으로 진행되었다. 본 실험은 다양한 조건에 따른 영향을 파악하기 위해 케나프를 이용해 고액비(1:4, 1:8, 1:2), 반응온도(150~300 ℃)와 체류시간(15~120분)을 다양하게 변화하며 진행되었다. 또한 생산된 hydrochar의 특성을 파악하기 위해 EA, FT-IR. TGA와 SEM을 이용해 분석을 진행하였다. Hydrochar의 탄소 함량은 kenaf에 비해 48.11% 증가하였고, 휘발성 물질은 39.34%가 감소하였다. 추가적으로 반응온도에 따라 연료적 특성이 강화되는 것 또한 확인하였다. 본 연구에서 나타난 결과는 kenaf가 열수탄화와 용매열법을 통해 연료 대체재로써 변화하는 것을 확인하였으며, 이는 석탄의 새로운 대체재가 될 수 있는 가능성을 보였다.

Keywords

Acknowledgement

본 논문은 농촌진흥청 공동연구사업(과제번호: PJ014779)의 지원에 의해 이루어진 것임.

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