| Search / Korean Journal of Chemical Engineering |
Korean Chemical Engineering Research,
Vol.46, No.3, 555-560, 2008
Vol.46, No.3, 555-560, 2008
저등급 석탄으로부터 초청정석탄의 추출과 초음파의 영향
Ultrasonic Effect on the Extraction of Ash-free coal from Low Rank Coal
저등급 석탄으로부터 무회분 초청정 석탄 제조를 위하여 온도 200-430 ℃, 0.1MPa에서 추출실험을 수행하였다. 세가지의 서로 다른 등급의 석탄시료를 사용하였으며 추출용매는 극성용매 N-methyl-2-pyrrolidinone(NMP)와 비극성 용매 1-methyl naphthalene(1-MN), Light Cycle Oil(LCO)를 사용하였다. 실험결과 NMP에 의한 추출율이 1-MN이나 LCO에 의한 추출율 보다 높게 나타났다. 그러나 회분농도는 1-MN에 의한 추출탄이 가장 낮았다. 세가지 추출 운전모드, 즉 무교반운전모드, 교반운전모드, 그리고 초음파를 이용한 운전모드를 각각 수행하였다. 추출온도 350 ℃에서 NMP를 사용한 추출실험에서, 교반운전모드에서의 추출율 및 추출탄의 회분농도는 각각 70.09wt%(daf), 1.03wt%(db) 이었으며, 초음파를 이용한 운전모드에서의 추출율 및 추출탄의 회분농도는 각각 80.70wt%(daf), 0.76wt%(db) 이었다. 1-MN를 사용한 추출에서도 NMP의 경우와 같이 초음파 추출이 가장 우수한 추출특성을 나타냈다. 초음파를 이용한 추출방법은 교반추출과 비교하여 추출율을 15-20%, 회분 저감은 최대 26% 까지 향상시킬 수 있었다.
Extraction was performed to prepare ash-free coal from low rank coal under the temperature of 200-430 ℃ and initial pressure of 0.1MPa. Three kinds of coal samples with different rank were used and N-methyl-2-pyrrolidinone(NMP, polar), 1-methyl naphthalene(I-MN, non-polar), Light Cycle Oil(LCO, non-polar) were used as solvents. Results showed that higher extraction yield could be obtained with NMP than with 1-MN and LCO, but the ash concentration shows minimun in the case of 1-MN. Three operation modes were compared, that is, idle, agitation and ultrasonic extraction mode. From the results, it was found that the extraction yield and ash concentration were 70.09% and 1.03% under the agitation mode, 80.7% and 0.76% under the ultrasonic operation mode respectively in the case of NMP used at the temperature of 350 ℃. Similar results were obtained with 1-MN. Effect of ultrasonic on the extraction was estimated as 15-20% increase in the yields and 26% reduction in the ash concentration.
[References]
- Steel KM, Besida J, O'Donnell TA, Wood DG, Fuel Process. Technol., 70(3), 171, 2001
- Steel KM, Besida J, O'Donnell TA, Wood DG, Fuel Process. Technol., 70(3), 193, 2001
- Steel KM, Patrick JW, Fuel, 80, 2019, 2001
- Kashimura N, Takanohashi T, Saito I, Energy Fuels, 20(5), 2063, 2006
- Okuyama N, Komatsu N, Shigehisa T, Kaneko T, Tsuruya S, Fuel Process. Technol., 86, 947, 2004
- Yoshida T, Takanohashi T, Sakanishi K, Saito L, Fujita M, Mashimo K, Fuel, 81, 1463, 2002
- Yoshida T, Li C, Takanohashi T, Matsumura A, Sato S, Saito I, Fuel Process. Technol., 86(1), 61, 2004
- Haizhou L, Lester P, Jochen W, Food Res. Int., 37, 731, 2004
- Lee KJ, Row KH, Korean J. Chem. Eng., 23(5), 779, 2006
- Zaidi SAH, Fuel Process. Technol., 33, 95, 1993
- Okuyama N, Komatsu N, Shigehisa T, Kaneko T, Proceedings of 21th Annual International Pittsburgh Coal Conference, 2004
- Yoshida T, Takanohashi T, Sakanishi K, Saito I, Fujita M, Mashimo K, Energy Fuels, 16(4), 1006, 2002
- Li CQ, Takanohashi T, Saito I, Energy Fuels, 18(1), 97, 2004
[Cited By]
- Lee EJ, Oh DG, Kim SM, Park ES, We SG, Korean Chemical Engineering Research, 48(3), 365, 2010
- Choi HK, Kim SD, Yoo JH, Chun DH, Lim JH, Rhim YJ, Lee SH, Korean Chemical Engineering Research, 50(3), 449, 2012
- Kwon HJ, Choi HK, Jo WT, Kim SD, Yoo JH, Chun DH, Rhim YJ, Lim JH, Lee SH, Rhee YW, Korean Chemical Engineering Research, 54(2), 234, 2016
참고문헌정보(참고문헌, 인용문헌)는 화학공학소재연구정보센터에 의해 제공되고 있습니다.