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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 June 2, 2017
Accepted July 18, 2017

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 희박상 내 탄소나노튜브 응집체의 크기 및 형상 측정

Measurement of Carbon Nanotube Agglomerates Size and Shape in Dilute Phase of a Fluidized Bed

김성원^†

Sung Won Kim^†

한국교통대학교 화공신소재고분자공학부, 27469 충청북도 충주시 대학로 50

School of Chemical and Material Engineering, Korea National University of Transportation, 50, Daehak-ro, Chungju, Chungbuk, 27469, Korea

kswcfb@ut.ac.kr

Korean Chemical Engineering Research, October 2017, 55(5), 646-651(6), 10.9713/kcer.2017.55.5.646 Epub 19 October 2017

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Abstract

CNT 유동층 반응기(내경 0.15 m, 높이 2.6 m) 희박상 내 CNT 입자(평균입도 291 μm, 벌크밀도 72.9 kg/m3)의 거동을 확인하기 위해 레이저 슬릿광 형상 측정법을 이용하여, CNT 응집체의 크기 및 형태를 측정하였다. 기포유동층 조건에서 CNT 반응기 내 축방향 고체체류량 분포는 하부 농후상과 상부 희박상을 갖는 S자 형태를 보였다. 기체 유속이 증가할수록 비산되는 CNT 응집체의 Heywood 직경과 Feret 직경이 증가하였고, 응집체 내 CNT 입자수가 증가 하였다. 또한, 기체의 유속이 증가할수록 CNT 응집체의 종횡비는 증가하고, 원형도는 감소하였다. CNT 응집체의 원마도와 견고도는 기체의 유속이 증가할수록 감소하였다. 응집체의 형상 분석 정보에 기반한 희박상 내 응집체 형성 원인을 제안하였다.

Size and shape of carbon nanotube (CNT) agglomerates in the dilute phase of a bubbling fluidized bed (0.15 m i.d. × 2.6 m high) have been determined by the laser sheet technique. Axial solid holdup distribution of the CNT particles showed S curve with dense phase and dilute phase in bubbling fluidization regime. Heywood diameter and Feret diameter of the CNT agglomerates in the dilute phase of bubbling fluidized bed increased with increasing gas velocity. The CNT particle number in the agglomerates increased with increasing of gas velocity. Aspect ratio increased and circularity, roundness and solidity decreased with increasing of gas velocity. A possible mechanism of agglomerates formation was proposed based on the obtained information.

Keywords

Carbon nanotube Fluidized bed Agglomerate Visualization Shape

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