Increasing the quality of low-rank coal through the upgrading brown coal (UBC) process with used lubricant oil and waste cooking oil

• Main Authors: Afrah, Bazlina Dawami, Pratama, Muhammad Yori, Cundari, Lia, Riady, M. Ihsan, Widhaningtyas, Hosana, Afrah, Miftahurrizka
• Format: Conference Proceeding
• Language: English
• Subjects: Calorific value; Coal; Cooking; Lignite; Lubricants; Mixing ratio; Mixtures; Moisture content; Moisture effects; Power plants; Sizing; Steam electric power generation
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0114778

The use of coal as the energy source for industry and steam power plants is dominated by high quality or hard coal. The Upgrading Brown Coal (UBC) process is carried out regarding the obligation to increase the added value of low-quality mining products as a substitute or reserve for hard coal supply. The use of UBC products can reduce hard coal consumption by up to 50% of the use of low-rank coal. Moreover, the UBC process is still being developed. In this study, a mixture of low-rank coal, waste lubricant oil, and waste cooking oil is used as a coating material to cover the coal pores after the dewatering process and enhance the characteristics of coal. The variation in the mixing ratio of low-rank coal, waste cooking oil, and used lubricant oil was 75:100:75 and 75:75:150, varying from the mixing time of 30, 60, and 90 minutes. The analysis showed that the highest calorific value obtained was 7614 cal/g at 75:75:150 mixture ratio with 90 minutes mixing time and 120 mesh particles sizing. Additionally, the lowest moisture content was found with a 75:100:125 mixture ratio, 90 minutes mixing time, and 120 mesh particles sizing at 2.79% air-dried basis inherent moisture.