가압 마이크로 수송관을 이용한 저급탄의 건조 특성 연구

곽인섭; 곽유라; 김예빈; 이시훈; In Seop Gwak; You Ra Gwak; Ye Bin Kim; See Hoon Lee

Applied Chemistry for Engineering, Vol.28, No.3, 313-317, June, 2017

DOI10.14478/ace.2017.1020 Export Citation

가압 마이크로 수송관을 이용한 저급탄의 건조 특성 연구

Study of Drying Characteristics of Low Rank Coal in a Pressurized Micro-riser

곽인섭, 곽유라, 김예빈, 이시훈^†

전북대학교 자원 에너지공학과

In Seop Gwak, You Ra Gwak, Ye Bin Kim, and See Hoon Lee^†

Department of Resources and Energy Engineering, Chonbuk National University, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Korea

E-mail:

초록

지속적인 에너지 수요의 증가로 인하여 저등급 석탄이 새로운 에너지 자원으로서 인정받고 있다. 그러나 저등급 석탄의 높은 수분 함량으로 인하여 저등급 석탄의 이용 효율은 기존의 석탄 이용 플랜트들에서 이용하기에 부족하다. 따라서 저등급 석탄의 수분 함량을 낮추는 건조 공정이 요구되고 있다. 비록 다양한 건조 실험들이 진행되었으나, 고압 조건에서의 건조 특성은 크게 연구되지 않았다. 이에 본 연구에서는 높은 수분 함량을 지닌 저등급 석탄(수분 함량: 21.5 wt%)의 급속 건조 특성을 가압 마이크로 상승관을 이용하여 고찰하였다. 압력(1-40 bar), 건조 온도(200-600 ℃), 마이크로 상승관 길이(2-6 m) 등의 운전 조건 변화에 따른 저등급 석탄의 건조 특성을 분석하였다.

With the continuous increase of energy demand, low-grade coal is regarded as one of new energy sources. However, due to the high water content, the utilization efficiency of low-grade coal is not good to be used in recent conversion plants. Therefore, it requires a drying process to lower the water content in low-grade coals. Although a variety of drying experiments were conducted, drying characteristics in accordance with the pressure change has not been progressed. In this study, the flash drying characteristics of low grade coal with high moisture content (21.5 wt%) were determined in a pressurized micro- riser. The effect of operation conditions such as pressure (1-40 bar), dryer temperature (200-600 ℃), and tube length (2-6 m) on drying ratios were investigated.

Keywords:micro-riser;drying;low grade coal;pressurized flash dryer

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[1] Kook JW, Shin JH, Gwak IS, Lee SH, Appl. Chem. Eng., 26(2), 184 (2015)

[2] Kim SD, Lim KS, Lee SH, J. Korean Soc. Combust., 6, 383 (2010)

[3] Lee SH, Yoon SJ, Ra HW, Il Son Y, Hong JC, Lee JG, Energy, 35(8), 3239 (2010)

[4] Lee SH, Park ST, Lee R, Hwang JH, Sohn JM, Korean J. Chem. Eng., 33(12), 3523 (2016)

[5] Jangam SV, Karthikeyan M, Mujumdar AS, Dry. Technol., 29, 395 (2011)

[6] Karthikeyan M, Zhonghua W, Mujumdar AS, Dry. Technol., 27, 403 (2009)

[7] Allardice DJ, Chaffee AL, Jackson WR, Marshall M, Water in brown coal and dewatering. In: C.-Z. Li (ed.), Advances in the Science of Victorian Brown Coal, 85-133, Elsevier (2004).

[8] Osman H, Jangam SV, Lease JD, Mujumdar AS, Dry. Technol., 29(15), 1763 (2011)

[9] Gao JR, Tao XX, Hou T, Wan YZ, Clean Coal Technol., 14(6), 73 (2008)

[10] Jiang B, Li S, Gao JR, Liang GL, Meng H, Yang ZG, Clean Coal Technol., 6, 23 (2011)

[11] Rao ZH, Zhao YM, Huang CL, Duan CL, He JF, Prog. Energy Combust. Sci., 46, 1 (2015)

[12] Bergins C, Fuel, 82(4), 355 (2003)

[13] Wu JH, Liu JZ, Zhang X, Wang ZH, Zhou JH, Cen KF, Fuel, 148, 139 (2015)

[14] Eom TG, Choi SM, J. Korean Soc. Combust, 20(2), 1 (2015)

[15] Nikolopoulos N, Violidakis I, Karampinis E, Agraniotis M, Bergins C, Grammelis P, Kakaras E, Fuel, 155, 86 (2015)