Forecasting on Indonesian Coal Production and Future Extraction Cost: A Tool for Formulating Policy on Coal Marketing

Rosyid, Fadhila Achmadi; Adachi, Tsuyoshi

doi:10.4236/nr.2016.712054

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…Indonesian coal production from open pit mining is estimated to reach its peak in 2026 and subsequently will decreases due to limited coal reserves (Rosyid and Adachi, 2016). Extraction of deeper coal seam should be considered if Indonesia remains depend on coal for its energy.…”

Section: Introductionmentioning

confidence: 99%

Cement material development used for cementing underground coal gasification well

Huda

2018

IMJ

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The R&D Centre for Mineral and Coal Technology of the Ministry of Energy and Mineral Resources develops an underground coal gasification (UCG) technology including its UCG test in a coal mine at Musi Banyuasin regency, South Sumatra. The UCG is safer than the underground mine since there is no worker underground however there is a concern in risk of ground water pollution. One of the methods to reduce the risk is a proper installation of well casing and cementing that seal aquifer from contact with UCG product gas. Development of special cement for cementing UCG well is needed due to its high process temperature (up to 1300°C). The objective of this research is to develop a cement material that can withstand high temperatures environment. Domestically available an oil well cement (OWC) and a castables (CT) were used for the experiments. Single material of OWC is not suitable for cementing UCG well since the OWC compressive strength reduced drastically at heat treatment above 300°C due to decomposition of portlandite and calcium silicate hydrate. On the other hand, there was a synergistic effect that resulted of higher compressive strength sample if 60% weight of OWC and 40% weight of CT was blended. The absence of portlandite and the presence of inert filler materials in the blend is believed to improve thermal and mechanical properties of the blend. ABSTRAKPusat Penelitian dan Pengembangan Mineral dan Batubara, Kementerian Energi dan Sumber Daya Mineral sedang mengembangkan teknologi gasifikasi batubara bawah tanah (underground coal gasification/UCG) dan telah melakukan uji coba UCG di sebuah tambang batu bara di Musi Banyuasin, Sumatera Selatan. UCG lebih aman dibandingkan tambang bawah tanah karena tidak ada pekerja yang berada di bawah tanah tetapi ada resiko polusi air tanah akibat kegiatan UCG. Pemasangan casing dan penyemenan sumur akan mengurangi resiko tersebut tetapi karena proses UCG melibatkan suhu hingga 1300°C maka pengembangan semen yang tahan suhu tinggi untuk penyemenan sumur UCG perlu dikembangkan. Tujuan penelitian ini adalah mengembangkan bahan semen tahan suhu tinggi. Semen sumur minyak (oil well cement/OWC) dan castables (CT) yang dapat diperoleh di dalam negeri digunakan sebagai bahan penelitian. Hasil penelitian menunjukkan OWC kurang sesuai untuk penyemenan sumur UCG karena kuat tekannya menurun secara drastis pada suhu di atas 300°C. Hal ini terjadi karena awa-komposisi portlandit dan kalsium silikat hidrat pada suhu tersebut. Di lain pihak terjadi sinergi hasil blending 60% berat OWC dan 40% berat CT pada suhu perlakuan panas di atas 300 o C yang menghasilkan kuat tekan sampel lebih tinggi dibandingkan kuat tekan sampel OWC atau CT saja. Tidak adanya portlandit dan adanya bahan pengisi dalam campuran tersebut diperkirakan menjadi sebab terjadinya peningkatan kuat tekan semen hasil blending. Kata kunci: gasifikasi batubara bawah tanah, semen sumur minyak, castables, perlakuan panas

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Section: Introductionmentioning

confidence: 99%

Cement material development used for cementing underground coal gasification well

Huda

2018

IMJ

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“…The coal-fired power plant presences are an effort to create market share for the domestic mining industry, considering that Indonesia is main producer of coal commodities in the world (Hudaya & Madiutomo, 2019;Rosyid & Adachi, 2016). In addition, coal-fired power plants can be built more easily and placed closer to users after going through various suitability studies, thus production costs are relatively cheaper.…”

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confidence: 99%

The impact of Cirebon coal-fired power plants on water quality in Mundu Bay, Cirebon Regency

Widiawaty

Nurhanifah

Ismail

et al. 2020

SJES

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The presence of Cirebon coal-fired power plant I and II caused negative effects to coastal morphology and the quality of marine waters. This also have negative impacts to the fisherman around that sea. This study aims to examine the impact of the Cirebon coal-fired power plant on the water quality of Mundu Bay, Cirebon Regency. Water quality is determined based on total suspended solids (TSS), sea surface temperatures (SST), chlorophyll-A, and salinity in the range 1999 – 2019. Data collection was carried out using satellite imagery of Landsat-5 TM, Landsat- 7 ETM+, and Landsat-8 OLI verified with in-situ field measurements, Sentinel-2 A MSI, and MODIS Aqua imageries. Changes in water quality due to the infrastructure of the two power plants are known through the Mann-Whitney U-Test and Spearman’s correlation analysis. This research shows that two Cirebon coal-fired power plant has a significant effect on changes in the quality of Mundu Bay waters. Changes in water quality are shown by a significant increase in TSS concentrations and SST values accompanied by a decrease in chlorophyll-A levels and salinity levels. Changes in the quality of these waters also disrupt marine biota habitat and cause fishermen in around are difficult to get the ideal catchment yield.

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Optimization on long term supply allocation of Indonesian coal to domestic market

Rosyid

Adachi

2017

Energy Syst

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Forecasting on Indonesian Coal Production and Future Extraction Cost: A Tool for Formulating Policy on Coal Marketing

Cited by 5 publications

References 11 publications

Cement material development used for cementing underground coal gasification well

Cement material development used for cementing underground coal gasification well

The impact of Cirebon coal-fired power plants on water quality in Mundu Bay, Cirebon Regency

Optimization on long term supply allocation of Indonesian coal to domestic market

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