서지주요정보
석탄의 저온 건류시 생성되는 Char의 특성 = The characteristics of product char in low temperature carbonization of coal
서명 / 저자 석탄의 저온 건류시 생성되는 Char의 특성 = The characteristics of product char in low temperature carbonization of coal / 이재구.
저자명 이재구 ; Lee, Jae-Goo
발행사항 [대전 : 한국과학기술원, 1992].
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소장정보

등록번호

8002998

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 92004

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초록정보

The characteristics of low temperature carbonization for producing active carbon and solid fuel char were investigated by using a thermogravimetric analyzer (TGA) and a kiln type reactor. The effects of carbonization temperature (350-900℃), caking property in terms of free swelling index (0-7), residence time (50-85min), heating rate (10-900℃/min) and the composition of seven different parent coals on the reactivity of carbonization and the physical properties of char have been determined. The experimental results from TGA showes that heating rate has a slight effect on the weight loss, but the carbonization temperatures (450-650℃) produce a significant effect on the weight loss. The temperature-time programming of carbonization in a kiln type reactor was established based on the softening, fluidity and solidification temperature of coal. The weight loss in the kiln type reactor reached to 28% at 650℃ and the amounts of gases and tar increased proportionally with the volatile content of the parent coal. Depending upon the plastic property and volatile matter content of different coals, the weight loss of coal was reached the values of 1.7-9.2% under the isothermal reaction at fluidity temperature. The variation of residence time at a same carbonization temperature exhibits the different weight loss of each coal, but each coal finally approached to the limiting values. The form of produced ball shape-char in the kiln type reactor was different from that of char in the fixed bed reactor. The size of ball char formed from different coals increased with increasing fluidity (Dial Division Per Minute), especially over 3000. An elemental analysis of the remaining char indicated that the relative amount of H/C decreased significantly with increasing temperature. The decomposition rate of sulfur was faster than that of coal itself thus, the sulfur content of char could be lower than that of the parent coal about 30%. On the other hand, nitrogen evolution was negligible within this experimental temperature ranges. Pore structure showed that maximum micro and macropore volumes occured around 600℃ but a partial collapse of pore structure over 750℃ was observed owing to repolymerization. From the experimental results of hardness and surface area of char it is regarded that the optimum temperature range for producing active carbon and solid fuel should be in the 500-700℃. However higher reactivity of char-$O_2$ reaction by TGA were detected in the ranges of 600-650℃.

서지기타정보

서지기타정보
청구기호 {MCE 92004
형태사항 viii, 115 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Jae-Goo Lee
지도교수의 한글표기 : 김상돈
공동교수의 한글표기 : 손재익
지도교수의 영문표기 : Sang-Done Kim
공동교수의 영문표기 : Jae-Ek Son
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 105-110
주제 Char.
Coals.
건류. --과학기술용어시소러스
차즈. --과학기술용어시소러스
석탄. --과학기술용어시소러스
Carbonization.
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