STUDI PENGARUH UKURAN BUTIR BATUBARA DAN TINGKAT KEPADATAN BATUBARA TERHADAP POTENSI PEMBAKARAN SPONTAN PADA SKALA LABORATORIUM Study of the Effect of Coal Grain Size and Coal Compaction to the Spontaneous Combustion Potential at Laboratory Scale

Nuhindro P Widodo

Abstract


ABSTRAK

Pembakaran spontan batubara dapat menjadi masalah yang serius terutama bagi kegiatan penambangan karena dapat menyebabkan terjadinya kebakaran pada penimbunan batubara atau ledakan gas metana pada tambang bawah tanah batubara. Penelitian kali ini akan dititikberatkan pada pengaruh ukuran butir batubara dan tingkat kepadatan batubara terhadap perilaku pembakaran spontan batubara. Ukuran butir yang digunakan dengan penelitian ini adalah -10+14 mesh, -60+80 mesh dan -170+200 mesh dengan tingkat kepadatan 0 kPa dan 50 kPa. Ukuran butir ini dipilih untuk mewakili kondisi ukuran butir relatif besar hingga kecil pada penimbunan batubara, sedangkan tingkat kepadatan diasumsikan berasal dari ground pressure dozer sebesar 50 kPa. Dalam penelitian kali ini, digunakan metode oksidasi adiabatik dengan mengalirkan gas oksigen dengan debit 0,05 L/menit pada tabung uji. Selain itu, dilakukan pula pengujian difusi oksigen untuk menentukan laju kenaikan konsentrasi oksigen pada masing-masing parameter. Ukuran butir dan tingkat kepadatan butiran batubara memiliki pengaruh besar terhadap terjadinya pembakaran spontan batubara. Semakin kecil ukuran percontoh maka nilai R70 semakin besar. Adanya pemadatan memiliki pengaruh yang berbeda terhadap nilai R70 pada ukuran butir yang berbeda.

 

ABSTRACT

Spontaneous combustion of coal can be a serious problem especially for mining activities because it can cause fires in coal stockpiling or methane gas explosions in coal underground mines. This research will focus on the influence of coal grain size and coal compaction on the spontaneous combustion behavior of coal. The grain sizes used in this study are -10 + 14 mesh, -60 + 80 mesh and -170 + 200 mesh with a compaction pressure of 0 kPa and 50 kPa. This grain size was chosen to represent the condition from large to small grain size in coal stockpile, while the compaction level is assumed to come from the dozer ground pressure of 50 kPa. In this study, an adiabatic oxidation method was used by flowing oxygen gas with a discharge of 0.05 L / min in the test tube. In addition, an oxygen diffusion test was also carried out to determine the rate of oxygen concentration increase for each parameter. Grain size and compaction level of coal grains have a major influence on the spontaneous combustion of coal. The smaller the sample size, the greater the R70 value. The presence of compaction has a different effect on the value of R70 at different grain sizes.


Keywords


Kata kunci: Pembakaran spontan batubara, nilai R70, ukuran butir batubara, tingkat kepadatan batubara. . Keywords: Spontaneous coal combustion, R70 value, coal grain size, coal compaction.

Full Text:

PDF

References


Beamish, B. dan Beamish, R. (2010) “Benchmarking moist coal adiabatic oven testing,” in Aziz, N. (ed.) 2010 Underground Coal Operators’ Conference. University of Wollongong & the Australasian Institute of Mining and Metallurgy, hal. 264–268.

Beamish, B. dan Beamish, R. (2011) “Experience with using a moist coal adiabatic oven testing method for spontaneous combustion assessment,” in Aziz, N. (ed.) 11th Underground Coal Operators’ Conference. University of Wollongong & the Australasian Institute of Mining and Metallurgy, hal. 380–384.

Beamish, B., Edwards, D. dan Theiler, J. (2018) “Implementation of interactive spontaneous combustion hazard assessment and management at Meandu mine,” in Aziz, N. dan Kininmonth, B. (ed.) 18th Coal Operators’ Conference. The University of Wollongong, hal. 329–335.

Cliff, D., Brady, D. dan Watkinson, M. (2014) “Developments in the management of spontaneous combustion in Australian underground coal mines,” in Naj Aziz et al. (ed.) 2014 Coal Operators’ Conference. University of Wollongong - Mining Engineering, Australasian Institute of Mining and Metallurgy and the Mine Managers Association of Australia, hal. 330–338.

Saffari, A., Ataei, M. dan Sereshki, F. (2019) “Evaluation of the spontaneous combustion of coal (SCC) by using the R70 test method based on the correlation among intrinsic coal properties (Case study: Tabas Parvadeh coal mines, Iran),” Rudarsko-geološko-naftni zbornik, 34(3), hal. 49–60. doi: 10.17794/rgn.2019.3.6.

Sloss, L. L. (2015) Assessing and managing spontaneous combustion of coal. IEA Clean Coal Centre.

Syawaludin, Edo. 2016. Studi Pembakaran spontan Batubara dengan Alat Pemanas Adiabatik Pada Skala Laboratorium. Teknik Pertambangan, Institut Teknologi Bandung:Bandung.

Widodo, N. P., Syawaludin, E., & Arifin, Z. (2020). Studi Pembakaran Spontan Batubara Menggunakan Metode Pemanasan Adiabatik Pada Skala Laboratorium. Jurnal Teknologi Mineral dan Batubara, 16(2), 81-91.




DOI: https://doi.org/10.36986/impj.v2i1.24
Abstract views : 357 | views : 326

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.