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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 1, 2018
Accepted November 20, 2018

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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유동층 반응기 프리보드 내 높이에 따른 CNT 응집체 형상 변화

Effect of Height on CNT Aggregates Size and Shape in Freeboard Region of a Fluidized Bed

김성원^†

Sung Won Kim^†

한국교통대학교 화공신소재고분자공학부, 27469 충청북도 충주시 대학로 50

Department of Chemical and Material Engineering, Korea National University of Transportation, 50, Daehak-ro, Chungju-si, Chungcheongbuk-do, 27469 Korea

kswcfb@ut.ac.kr

Korean Chemical Engineering Research, February 2019, 57(1), 105-110(6), 10.9713/kcer.2019.57.1.105 Epub 31 January 2019

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Abstract

CNT 유동층 반응기(내경 0.15 m, 높이 2.6 m) 프리보드 내 미세 CNT 입자(평균입도 46 μm, 벌크밀도 93.2 kg/m3)의 높이 별 거동을 확인하기 위해 레이저 슬릿광 형상 측정법을 이용하여, CNT 응집체의 크기 및 형태를 측정하였다. 기체 유속 증가에 대해, 비산되는 CNT 응집체의 Feret 직경과 Heywood 직경이 증가하였다. 프리보드 내 높이가 증가할 수록 평균 직경은 작아졌고, 응집체 내 CNT 입자수가 감소하였다. 기체 유속 증가에 대해, 응집체의 종횡비는 농후상에 가까울수록 증가하였으나, 높은 높이에서는 감소하였다. 그러나, 견고도는 큰 변화를 보이지 않았다. 응집체의 형상 분석 정보에 기반하여, 높이 별 CNT 입자의 응집과정이 서로 다름을 확인하였다. 유동층 프리보드 내 CNT 응집체의 Heywood 직경을 예측할 수 있는 상관관계식을 제안하였다.

Effect of height on the size and shape of carbon nanotube (CNT) aggregates in the freeboard region of a bubbling fluidized bed (0.15 m i.d. × 2.6 m high) has been determined. Feret diameter and Heywood diameter of the CNT aggregates in the freeboard region of fluidized bed increased with increasing gas velocity. The average aggregate diameters and CNT particle number in the aggregates decreased with increasing of height in the freeboard. Aspect ratio increased as the location was closer to the surface of the dense phase, but decreased at the highest location. Solidity did not show any significant changes with height. The results showed the aggregates formation process is affected by the height in the freeboard. A correlation was proposed to predict the Heywood diameter of the CNT aggregates.

Keywords

Carbon nanotube Fluidized bed Aggregates Shape Height effect

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