석탄가스화 기술은 온실가스 배출이 많은 석탄을 사용하지만 이산화탄소 포집에 유리한 장점이 있어서 차세대 석탄활용 기술로 주목받고 있다. 석탄 또는 펫코크 슬러리를 이용하는 습식 가스화 기술은 건식 기술에 비하여 효율이 낮지만 낮은 건설비와 슬러리 공급 유연성 등의 장점으로 인하여 현재는 물론 미래에도 여전히 매력적인 기술로 인식될 것으로 판단된다. 본 연구에서는 역청탄을 슬러리화한 시료를 사용하고, 기존의 건식 석탄가스화기에 석탄슬러리 공급장치와 슬러리 공급 버너를 연계하여 가스화 실험을 수행하였다. 기존의 분류층 가스화기의 운전온도보다는 비교적 낮은 온도에서 운전을 수행하여 일부의 회재만이 슬랙으로 전환되고 나머지는 비산재로 배출되는 부분 용융형 가스화운전을 수행하였다. 운전 종료 후 슬랙과 비산재를 포집하여 탄소전환율을 계산하였고, 탄소 질량 정산 방법을 적용하여 가스화 운전 성능을 나타내는 가장 중요한 지표인 냉가스효율을 계산하였다. 탄소전환율과 냉가스효율은 약 98.5% 및 60.4% 수준으로서 파일롯급 플랜트에서의 실험 결과임을 고려하면 비교적 높은 값을 나타내었다. 또한 실험 결과와 화학적 평형상태 계산 결과를 서로 비교하고 에너지 정산을 통하여 실험 결과의 건전성을 확인하였다.

Coal gasification technology is considered as next generation clean coal technology even though it uses coal as fuel which releases huge amount of greenhouse gas because it has many advantages for carbon capture. Coal or pet-coke slurry gasification is very attractive technology at present and in the future because of its low construction cost and flexibility of slurry feeding system in spite of lower efficiency compared to dry feeding technology. In this study, we_x000D_ carried out gasification experiment using bituminous coal slurry sample by integrating coal slurry feeding facility and slurry burner into existing dry feeding compact gasifier. Especially, our experiment was conducted under fairly lower operation temperature than that of existing entrained-bed gasifier, resulting in partial slagging operation mode in which only part of ash was converted to slag and the rest of ash was released as fly ash. Carbon conversion rate was calculated from data analysis of collected slag and ash, and then cold gas efficiency, which is the most important indicator of gasifier performance, was estimated by carbon mass balance method. Fairly high performance considering pilot-scale experiment, 98.5% of carbon conversion and 60.4% of cold gas efficiency, was achieved. In addition, soundness of experimental result_x000D_ was verified from the comparison with chemical equilibrium composition and energy balance calculations.

Coal Slurry Gasification Partial Slagging Compact Gasifier Performance Analysis

Policy direction of new and renewable energy, Korea Energy Management Corporation (2012)
Green Technology Policy-map, Ministry of Education and Science Technology Green Technology Center (2012)
Lee JW, Yoo YD, Yun Y, J. Energy Eng., 20(2), 123 (2011)
Lee JW, Yun Y, Lee SJ, NICE, 31(1), 48 (2013)
Smoot LD, Smith PJ, Coal Combustion and Gasification, Plenum Press, New York (1985)
Higman C, Burgt M, Gasification, 2nd ed., Gulf Professional Publishing (2008)
Volk J, “Shell Coal Gasification: Delivering Performance in Chinese Operations”, GTC Conference, Washington D.C. (2010)
Radtke K, “Global Update on PRENFLO and HTW Gasification Technologies and Applications,” GTC Conference, Washington D.C. (2012)
Yoshida K, “Development of the Highly Durable COS Hydrolysis Catalyst for IGCC Gas Clean-up System,” GTC Conference, Washington D.C. (2012)
Crew J, “GE Gasification Project Update,” GTC Conference, Washington D.C. (2012)
Amick P, “E-Gas Technology 2012 Outlook,” GTC Conference, Washington D.C. (2012)
Zhou Z, “Experience and Future Development of ECUST Gasification Process,” GTC Conference, Washington D.C. (2012)
Tse D, “GE’s Petcoke Gasification Technology - Ready to Meet Today’s Feedstock Challenge,” 2nd Petroleum Conclave, Delhi (2013)
Das D, Dash U, Meher J, Misra PK, Fuel Process. Technol., 113, 41 (2013)
Blissett RS, Rowson NA, Fuel, 111, 555 (2013)
Ra HW, Lee SH, Yoon SJ, Choi YC, Kim JH, Lee JG, Korean Chem. Eng. Res., 48(2), 129 (2010)
Svoboda K, Pohorely M, Jeremias M, Kamenikova P, Hartman M, Skoblja S, Syc M, Fuel Process. Technol., 95, 16 (2012)
Yoon SJ, Choi YC, Hong JC, Ra HW, Lee JG, Korean Chem. Eng. Res., 46(3), 561 (2008)
Zhang JY, Zhou Z, Ma LW, Li Z, Ni WD, Energy, 51, 137 (2013)
Breault RW, Energies, 3(2), 216 (2010)
Jeon DH, Chung SW, Jeong KJ, Byun YS, Ra HW, Kim SD, J. Energy & Climate Change, 8(2), 94 (2013)
http://www.akchemtech.co.kr/product3_1.php.
Lee JW, Yun Y, Chung SW, Kang SH, Ryu JH, Kim GT, Kim YJ, Fuel, 117, 1052 (2014)
Darby A, “Compact Gasification Development and Test Status,” GTC Conference, Washington D.C. (2010)
Phillips J, “Different Types of Gasifiers and Their Integration with Gas Turbines,” The Gas Turbine Handbook, NETL DOE(http:// www.netl.doe.gov) (2006)
Lee H, Choi S, Paek M, J. Power and Energy, 225, 74 (2011)