PERTANIKA JOURNAL OF SCIENCE AND TECHNOLOGY

The assessment of a Coal-Fired Power Plant (CFPP) performance is an intricate process that involves the determination of Heat Rate (HR) deviations of current operational parameters from baseline or target values. This study focuses on HR deviations of a CFPP based on the Applicable Coal Price (ACP), and the influence of the ACP price on daily losses or gains are thoroughly analyzed for key performance parameters for three fixed ACP of RM12, 18, and 24 per GJ. This paper mainly investigates key parameters and related equipment that significantly affect the HR of the CFPP and ranks the parameters affecting HR from most significant to least significant. The baseline or target values are obtained from the plant commissioning manuals and the Performance Guarantee Test (PGT). Actual real-life operational data from a 700MWn CFPP is utilized to improve the accuracy and confidence levels of the results obtained. It was found that at the nominal operating baseload, the most significant negative HR deviation is for the Rotary Air Heater (RAH) gas exit temperature with a negative HR deviation of -137.9 kJ/kWh leading to an annual loss of RM17.6 million at ACP of RM24/GJ while the superheater and reheater spray flows are contributing least to the HR deviation. This analysis highlighting the impact of key parameters affecting the performance enables plant operations and maintenance teams to focus on such parameters to mitigate losses.

• Ahmadi, G. R., & Toghraie, D. (2016). Energy and exergy analysis of Montazeri steam power plant in Iran. Renewable and Sustainable Energy Reviews, 56, 454-463. https://doi.org/10.1016/j.rser.2015.11.074

• Almedilla, J. R., Pabilona, L. L., & Villanueva, E. P. (2018). Performance evaluation and off design analysis of the HP and LP feed water heaters on a 3 × 135 MW coal fired power plant. Journal of Applied Mechanical Engineering, 7(3), 1-14. https://doi.org/10.4172/2168-9873.1000308

• Behbahaninia, A., Ramezani, S., & Hejrandoost, M. L. (2017). A loss method for exergy auditing of steam boilers. Energy, 140, 253-260. https://doi.org/10.1016/j.energy.2017.08.090

• Bisercic, A. Z., & Bugaric, U. S. (2021). Reliability of baseload electricity generation from fossil and renewable energy sources. Energy and Power Engineering, 13, 190-206. https://doi.org/10.4236/epe.2021.135013

• Braun, S. (2021). Improving flexibility of fossil fired power plants. Encyclopedia of Energy Storage Elsevier, 2, 133-140 https://doi.org/10.1016/B978-0-12-819723-3.00085-8

• Buckshumiyanm, A., & Sabarish, R. (2017). Performance analysis of regenerative feedwater heaters in 210 MW thermal power plant. International Journal of Mechanical Engineering and Technology, 8(8), 1490-1495.

• Devandiran, E., Shaisundaram, V. S., Ganesh, P. B., & Vivek, S. (2016). Influence of feedwater heaters on the performance of coal fired power plants. International Journal of Latest Technology in Engineering, Management & Applied Science, 5(3), 115-119.

• Elhelwa, M., Dahmaa, K. S. A., & Attiaa, A. E. H. (2019). Utilizing exergy analysis in studying the performance of steam power plant at two different operation mode. Applied Thermal Engineering, 150, 285-293. https://doi.org/10.1016/j.applthermaleng.2019.01.003

• Energy Commission of Malaysia. (2020). Peninsular Malaysia Electric Supply Outlook 2020. https://www.ketsa.gov.my/msmy/pustakamedia/Penerbitan/Report%20on%20Peninsular%20Malaysia%20Generation%20Development%20Plan%202020%20(2021-2039).pdf

• Energy Commission of Malaysia. (2022). Trend of Fuel Prices. https://www.st.gov.my/contents/2022/Fuel%20Prices/8-%20ACP%20as%20of%20Mac%202022.pdf

• Gupta, M., & Kumar, R. (2015). Thermoeconomic optimization of a boiler used in a coal fired thermal power plant based on hot air temperature. International Journal of Recent Advances in Mechanical Engineering, 4(2), 39-44. https://doi.org/10.14810/ijmech.2015.4205

• Jianlan, L., Zhaoyin, Z., Jizhou, W., & Shuhong, H. (2016). On-line fouling monitoring model of condenser in coal-fired power plants. Applied Thermal Engineering, 104, 628-635. 10.1016/j.applthermaleng.2016.04.131

• Mathews, E. H., van Laar, J. H., Hamer, W., & Kleingeld, M. (2020). A simulation-based prediction model for coal-fired power plant condenser maintenance. Applied Thermal Engineering, 174, Article 115294. https://doi.org/10.1016/j.applthermaleng.2020.115294

• Mohammed, M. K., Al Doori, W. H., Jassim, A. H., Ibrahim, T. K., & Al-Sammarraie, A. T. (2020). Energy and exergy analysis of the steam power plant based on effect the numbers of feed water heater. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 56(2), 211-222.

• Neshumayev, D., Rummel, L., Konist, A., Ots, A., & Parve, T. (2018). Power plant fuel consumption rate during load cycling. Applied Energy, 224(C), 124-135. https://doi.org/10.1016/j.apenergy.2018.04.063

• Nistah, N. N. M., Motalebi, F., Samyudia, Y., & Alnaimi, F. B. I. (2014). Intelligent monitoring interfaces for coal fired power plant boiler trips: A review. Pertanika Journal of Science and Technology, 22(2), 593-601.

• Oyedepo, S. O., Kilanko, O., Waheed, M. A., Fayomi, O. S. I., Ohunakin, O. S., Babalola, P. O., Ongbali, S. O., Nwaokocha, C. N., Mabinuori, B., & Shopeju, O. O. (2020). Dataset on thermodynamics performance analysis and optimization of a reheat-regenerative steam turbine power plant with feed water heaters. Data in brief, 32, Article 106086. https://doi.org/10.1016/j.dib.2020.106086

• Pachaiyappan, J., & Prakash, D. (2015). Improving the boiler efficiency by optimizing the combustion air. Applied Mechanics and Materials, 787, 238-242. https://doi.org/10.4028/www.scientific.net/ AMM.787.238

• Sabzpooshani, M., Azadehfar, E., & Sardarian, S. (2019). Exergy evaluation and optimization of a new steam power plant configuration in order to use the boiler blowdown water. Journal of Energy Management and Technology (JEMT), 3(1), 30-39.

• Sikarwar, A. S., Dandotiya, D., & Agrawal, S. K. (2013). Performance analysis of surface condenser under various operating parameters. International Journal of Engineering Research and Applications, 3(4), 416-421.

• Sundaravinayaka, U., & Jayapaul T. (2017). Optimization of boiler operation in thermal power station. International Journal of Latest Engineering Research and Applications, 2(3), 64-68.

• Tian, Z., Xu, L., Yuan, J., Zhang, X., & Wang, J. (2017). Online performance monitoring platform based on the whole process models of subcritical coal-fired power plants. Applied Thermal Engineering, 124, 1368-1381. https://doi.org/10.1016/j.applthermaleng.2017.06.112

• Wang, Y., Cao, L., Hu, P., Li, B., & Li, Y. (2019). Model establishment and performance evaluation of a modified regenerative system for a 660 MW supercritical unit running at the IPT setting mode. Energy, 179, 890-915. https://doi.org/10.1016/j.energy.2019.05.026

• Wijaya, A. A., & Widodo, B. U. K. (2018). The effect of feedwater heaters operation schemes to a 200 MW steam power plant heat rate using cycle-tempo software. IPTEK Journal of Engineering, 4(3), 33-37. https://doi.org/10.12962/joe.v4i3.4995

• Zhang, Y., Wang, J., Yang, S., & Gao, W. (2018). An all-condition simulation model of the steam turbine system for a 600 MW generation unit. Journal of Energy Institute, 91(2), 279-88. https://doi.org/10.1016/j. joei.2016.11.007