.png)
2.png)
Study of Coal Drying Characteristics Using Boiler Blowdown in a Rotary Coal Dryer
Abstract
Drying lignite coal to reduce its moisture content has become popular in the last decade. Previously, coal dryers used typical energy such as steam, fuel, or electrical as heat sources. Waste energy had never been implemented in a coal dryer while using it would reduce the cost of production and raise the economic value of the coal itself. An experimental study of drying low-rank coal was conducted using waste energy boiler blowdown in a rotary coal dryer. With variations of 0.595 mm, 1.18 mm, and 4.75 mm coal particle size and the flow's changes of 20 kg/hour, 30 kg/hour, and 40 kg/hour. The hot air temperature of 70oC, mass flow rate of 36 kg/hour, and pressure of 0,03 MPa were the constant parameters on the 15 rpm rotary drum. The results found that the coal moisture decreased significantly at 0.595 mm particle size and 20 kg/hour of flow. The final coal moisture dropped by 20.685%, and the calorific value increased by 879.6 kcal/kg from its initial value. In addition, the efficiency of the rotary coal dryer is 81.8%.
Keywords
Full Text:
PDFReferences
A. S. Novrizqa, “Numerical studies coal drying characteristics of fluidized bed coal dyer against the effect of temperature variations of air heater with tube staggered stacked heaters and chamber volume comparison and 50% coal volume,” 2013.
“Guandong Power Engineering Corporation, Operator and maintenance training program boiler part,” pp. 17–20, 2014.
B. . W. Company, Steam: Its generation and use. Babcock & Wilcox Company, 1923.
T. Culban, “The effects of bed height and initial moisture concentration on drying lignite in a batch fluidized bed,” Apr. 2006.
E. K. Levy, N. Sarunac, H. Bilirgen, and H. Caram, “Use of coal drying to reduce water consumed in pulverized coal power plants,” tech. rep., Lehigh Univ., Bethlehem, PA (United States), 2006.
A. S. Z. Arifin, “Low rank coal drying technology for decreasing electricity cost production: Case study of Nagan Raya power plant,” tech. rep., Technology Development and Standardization Department PT. PLN (Persero), 2020.
D. L. Karlina and I. Bintang, “Optimization design of coal dryer using genetic algorithm in power plant,” International Journal of Artificial Intelligence & Robotics (IJAIR), vol. 3, no. 1, pp. 36–43, 2021.
I. Bintang, Optimasi Perancangan Coal Dryer Dengan Memanfaatkan Steam Dari Keluaran Turbin Pada Pembangkit Listrik Tenaga Uap Paiton. PhD thesis, Institut Teknologi Sepuluh Nopember, 2017.
H. Hongji, “Henan Hongji Mine Machinery Co., Ltd.,” Dec. 2021.
M. Liu, J. Yan, D. Chong, J. Liu, and J. Wang, “Thermodynamic analysis of pre-drying methods for pre-dried lignite-fired power plant,” Energy, vol. 49, pp. 107–118, 2013.
M. Liu, J. Yan, B. Bai, D. Chong, X. Guo, and F. Xiao, “Theoretical study and case analysis for a predried lignite-fired power system,” Drying Technology, vol. 29, no. 10, pp. 1219–1229, 2011.
T. Istanto, “Waste heat utilization system in the blow-down process in the boiler,” Mekanika, vol. 3, no. 2, 2005.
L. K, “Selection of wire electrical discharge machining process parameters on stainless steel AISI grade-304 using design of experiments approach,” Journal of The Institution of Engineers, 2021.
K. Hatzilyberis, G. Androutsopoulos, and C. Salmas, “Indirect thermal drying of lignite: Design aspects of a rotary dryer,” Drying Technology, vol. 18, no. 9, pp. 2009–2049, 2000.
W. Komariah, “Removing moisture for quality improvement of Indonesian low rank coal by microwave heating,” Master’s thesis, Universitas Indonesia, 2012.
DOI: http://dx.doi.org/10.12962/j25807471.v6i1.12053
JMES The International Journal of Mechanical Engineering and Sciences by Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) ITS is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Based on a work at https://iptek.its.ac.id/index.php/jmes.