The influence of steam drying process on combustion behavior of Indonesian low-rank coals

Abstract

Steam drying process of the Low Rank Coals (LRCs) has been conducted to produce coal which is comparable with the High Rank Coal (HRC). Characterization of the raw and dried coals was carried out through proximate, ultimate, calorific value, Fourier Transform Infrared (FTIR) spectroscopy and Thermo Gravimetry-Differential Thermal Analysis (TG-DTA) to study the combustion behavior of the coals. This study used Indonesian low rank coals coming from Tabang (TKK coal) and Samurangau (SP coal), East Kalimantan. The results indicate that the calorific value of the dried coals increases significantly due to the decrease in moisture content of the coal. The FTIR spectrums show that the methylene-ethylene (RCH3/CH2) and aromaticity-aliphaticity ratios (Rar/al) of the dried coals increased while the ratio of RCO/ar decreased which reflect that the rank of the coals increased equivalent to the high rank coal (bituminous). Meanwhile, the TG-DTA indicates that the ignition temperature (Tig) and combustion rate (Rmax) of the dried coals increased. This analysis expresses that the dried coals produced by steam drying process have better combustion behavior due to the higher calorific value than those of the raw coals.

Combustion Characteristic of Low Rank Coal Blend with EFB and Plastic Waste

“…The ignition behavior of coal is critical for arrange the process of combustion because it influences pollutant production and emission [17]. Tig shows sample volatility content, samples with the low volatility is generally have high Tig [18] [19]. The Coal sample has ignition temperature (Tig) of 282.8°C with weight loss is 23.78%, while C1, C2, and C3 sample are 257.8°C, 276.2°C, and 267.4°C respectively, with weight loss 18.25%, 15.56%, and 16.33%.…”