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Research Paper

The CH4-CO2 Adsorption Characteristics of Sub-bituminous Coal with Different Particle Sizes

아역청탄의 입자 크기별 CH4-CO2 흡착 특성 분석

Donghyeon Kim1
,
Jangchoon Lee1
,
Youngsoo Lee1*
김 동현1
,
이 장춘1
,
이 영수1*
1Dept. of of Mineral Resources and Energy Engineering, Chonbuk National University
1전북대학교 자원‧에너지공학과
* Corresponding Author
28 February 2018. pp. 37-48
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Abstract

Sorption characteristics of sub-bituminous coal were analyzed using six different particle size groups of coal to estimate the CBM production potential. By using proximate analysis, moisture and ash contents were analysed. Samples were divided into six groups with particle size from 180-254 µm to 20 mm. For each sample, volumetric method was selected to measure the Langmuir pressure(PL), volume(VL), and equilibrium time. As a result, as particle size decreases, VL increases due to the removal of impurities and increases of specific surface area. In case of CO2, adsorbed volume is higher than CH4 because of the adsorption affinity. In contrast, adsorption time was similar between small size of samples. However, in case of 2 mm sample, the total adsorption time was increased significantly because injected gas needs more time to diffuse through coal matrix. In conclusion, both appropriate particle size and adsorption time should be considered in sorption experiment.

Keywords
Coal Bed Methane
Adsorption
Sub-bituminous
Coal particle size
Langmuir

석탄 입자 크기별 석탄층메탄가스 흡착 특성을 분석하기 위하여, 아역청탄 시료를 180-254 µm부터 20 mm까지의 입자로 총 6개의 시료 군으로 분류하고 부피측정법을 이용하여 랭뮤어 인자와 평형 시간을 측정하였다. 메탄가스를 이용한 흡착 실험결과, 석탄 입자 크기가 작을수록 함유된 불순물 함량이 적어지고 비표면적이 증가함에 따라 흡착량이 증가하였다. 이산화탄소의 경우 흡착 친화도의 차이로 더 많은 양의 가스가 흡착되었다. 반대로 흡착 과정에서는 압력 상승에 따라 일정 크기 이하의 입자에서는 흡착 시간이 유사하였으나, 입자 크기가 커질수록 가스가 암체 내 확산 후 흡착되므로 총 흡착시간은 증가하였다. 실험결과로 괴탄 시료의 흡착실험을 수행할 경우, 현장상태의 회분과 수분을 유지할 수 있어 현장과 유사한 흡착량 산출이 가능하지만 입자 크기 및 흡착시간에 대한 주의가 필요함을 알 수 있었다.

키워드
석탄층메탄가스
흡착
아역청탄
석탄 입자 크기
랭뮤어
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 55
  • No :1
  • Pages :37-48
  • Received Date : 2017-10-24
  • Revised Date : 2018-01-15
  • Accepted Date : 2018-02-23
  • DOI :https://doi.org/10.12972/ksmer.2018.55.1.037
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