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Hidayat, Heindrix
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Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analysis of coal quality as fuel for steam power plants in Langkat Regency based on the proximate test Alfath Khoir Nst; Sayuthi, Muhammad; Amani, Yasir; Habibi, Muhammad; Faisal, Faisal; Hidayat, Heindrix
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 2 (2025): September
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i2.23

Abstract

Coal quality assessment is crucial for determining its suitability as a fuel for power generation and industrial applications. Such evaluation generally involves proximate and ultimate analyses. The proximate analysis provides information on moisture, volatile matter, fixed carbon, and ash content, whereas the ultimate analysis identifies elemental composition such as carbon, hydrogen, oxygen, nitrogen, and sulfur. Geological factors, including age, temperature, and pressure during formation, strongly influence coal quality. This study aims to evaluate the effect of particle size on coal quality using grain sizes of 40 and 60 mesh, analyzed according to ASTM standard procedures. The results indicate that coal with a grain size of 40 mesh contains, on average, 22.22% moisture, 5.83% ash, 37.54% volatile matter, and 34.15% fixed carbon. In contrast, coal with a grain size of 60 mesh exhibits 20.45% moisture, 6.80% ash, 42.77% volatile matter, and 29.99% fixed carbon. These findings highlight the significant influence of particle size on the proximate characteristics of coal, which can affect its combustion behavior and potential applications in power plants and other industries
Analysis of steam consumption in the crude palm oil sterilizer during a 90-minute boiling process Yasir Amani, Yasir Amani; Siregar, M. Ronny Syahputra; Faisal, Faisal; Hidayat, Heindrix
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 2 (2025): September
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i2.24

Abstract

In crude palm oil production, productivity largely depends on the performance of the sterilizer, particularly the horizontal type that operates using steam pressure. This study aimed to analyze the performance of the sterilizer by observing the boiling process of fresh fruit bunches (FFB) and determining the heat required during a single sterilization cycle. Observations were carried out throughout the sterilization process, with steam pressure monitored using the pressure gauge located on top of the sterilizer vessel. The daily steam requirement varied, with the highest recorded on the 10th day, reaching 1,050 kg of steam for 735 tons of FFB. Interestingly, a higher volume of FFB did not always correspond to a higher steam demand. On average, the sterilization process required 827 kg of steam per ton of FFB over 24 hours. At PT. Perkebunan Nusantara IV PKS Dolok Sinumbah, the horizontal sterilizer operates with a triple-peak system, a boiling time of 90–100 minutes, steam pressure of 2.8–3.2 kg/cm², and temperatures between 120–135 °C. The results indicate that the heat required reached 738,160.5 kcal/s, the latent heat was 7,772,760 kJ, and the total steam consumption amounted to 8,510,920.5 kcal for 30 tons of FFB.
Co-Authors Alfath Khoir Nst Faisal Faisal Muhammad Habibi Muhammad Sayuthi Siregar, M. Ronny Syahputra Yasir Amani Yasir Amani, Yasir Amani