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Stabilization Characteristics of Upgraded Coal using Palm Acid Oil
Rifella, Archi,Chun, Dong Hyuk,Kim, Sang Do,Lee, Sihyun,Rhee, Youngwoo The Korean Society of Clean Technology 2016 청정기술 Vol.22 No.4
These days, coal is one of the most important energy resources used for transportation, industry, and electricity. There are two types of coal: high-rank and low-rank. Low-rank coal has a low calorific value and contains large amounts of useless moisture. The quality of low-rank coal can be increased by simple drying technology and it needs to be stabilized by hydrocarbons (e.g. palm acid oil, PAO) to prevent spontaneous combustion and moisture re-adsorption. Spontaneous combustion becomes a major problem during coal mining, storage, and transportation. It can involve the loss of life, property, and economic value; reduce the quality of the coal; and increase greenhouse gas emissions. Besides spontaneous combustion, moisture re-adsorption also leads to a decrease in quality of the coal due to its lower heating value. In this work, PAO was used for additive to stabilize the upgraded coal. The objectives of the experiments were to determine the stabilization characteristic of coal by analyzing the behavior of upgraded coal by drying and PAO addition regarding crossing-point temperature of coal, the moisture behavior of briquette coal, and thermal decomposition behavior of coal.
Development of Treatment Process for Residual Coal from Biosolubilization
Rifella, Archi,Shaur, Ahmad,Chun, Dong Hyuk,Kim, Sangdo,Rhim, Young Joon,Yoo, Jiho,Choi, Hokyung,Lim, Jeonghwan,Lee, Sihyun,Rhee, Youngwoo The Korean Society of Clean Technology 2018 청정기술 Vol.24 No.2
This study introduced a treatment process that was developed to treat Indonesian low-rank coal with high-ash content, which has the same characteristics as residual coal from the biosolubilization process. The treatment process includes separation of ash, solid-liquid separation, pelletizing, and drying. To reduce the ash content, flotation was performed using 4-methyl-2-pentanol (MIBC) as frother, and kerosene, waste oil, and cashew nut shell liquid (CNSL) as collectors. The increasing amount of collector had an effect on combustible coal recovery and ash reduction. After flotation, a filter press, extruder, and an oven drier were used to make a dried coal pellet. Then another coal pellet was made using asphalt as a binder. The compressive strength and friability of the coal pellets were tested and compared.