Gasification characteristics of biomass/coal mixture in an ICFB reactor = 내부순환 유동층 반응기에서 바이오매스와 석탄 혼합물의 가스화 반응 특성 연구

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In present study, thermochemical characteristics of biomass and biomass/coal blend were determined during pyrolysis and gasification process. Sawdust, rice husk, peanut shell, gingko nut shell and Jatropha seed shell were chosen as a resource of lignocellulosic biomass. From thermogravimetric analysis, thermochemical characteristics of these biomass samples were determined, as well as cellulose and lignin which are the main component of biomass at a given linear heating rate. There are big differences between cellulose and lignin thermal behavior during pyrolysis. Cellulose was decomposed within relatively low and very narrow temperature range with higher devolatilization rate. However, lignin was decomposed within very broad temperature range from 200 ℃ to 900 ℃ with very low devolatilization rate. It is attributed to the structural differences between cellulose and lignin. From biomass pyrolysis, it can be classified into 3 stages, and each stage is mainly corresponding hemicellulose, cellulose and lignin in order of temperature range where one of the main components was mainly decomposed. Since each sample has different contents of cellulose, hemicellulose and lignin, one showed the different thermal behavior at each stage. In other words, weight loss at each stage is linearly proportional to the content of component corresponding to that stage in samples. In addition, interactions among the main components of biomass are not appeared. As the heating rate increases, the range of the degradation temperature of samples become relatively narrow and several adjacent peaks are united to form overlapped broader and higher peaks due to simultaneous decomposition of main components of biomass. As a result, from a thermo balance reactor which heat up sample within very few seconds, decomposition reaction of Jatropha seed shell is shown like only one reaction. Kinetic analysis of Jatropha seed shell was conducted by using a thermo balance reactor under isothermal cond...
Advisors
Kim, Sang-Doneresearcher김상돈researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2011
Identifier
466377/325007  / 020075064
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2011.2, [ viii, 169 p. ]

Keywords

gasification; pyrolysis; coal; biomass; ICFB reactor; 내부순환유동층; 가스화; 열분해; 석탄; 바이오매스

URI
http://hdl.handle.net/10203/29112
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=466377&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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