<![CDATA[This study aims to analyze the effect of coal quality on the combustion efficiency of Boiler Unit 4 at coal-fired power plant and to evaluate blending strategies of coal from multiple suppliers. The observed quality parameters include total moisture, inherent moisture, ash content, volatile matter, fixed carbon, total Sulphur, and calorific value. Variations in coal quality were identified using Statistical Process Control to determine their impact on boiler performance. The results indicate that total moisture, total Sulphur, and calorific value are the most influential factors, with an average efficiency of only 83.96%. A blending simulation with specific supplier proportions successfully increased efficiency to 88.00% while still meeting the quality specifications. Further analysis using the 5W+1H approach revealed additional contributing factors related to human, machine, material, method, and environmental aspects. The study concludes that coal blending is effective in improving efficiency, but it should be supported by selecting higher-quality of 3 suppliers with proportion 30%, 40% and 30% respectively and enforcing quality control strictly. The proposed improvements are creation of operational standards for blending strategies, development of training programs for operators to handle variations in coal quality, and investment in closed coal storage to better maintain its quality.]]>
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