USABILITY OF CONTROL CHARTS TO MONITOR VARIATION OF QUALITY PARAMETERS IN COAL-FIRED THERMAL POWER PLANTS

Year 2020, Volume: 59 Issue: 4, 247 - 253, 01.12.2020

Ali Can Özdemir

https://doi.org/10.30797/madencilik.845148

Cited By: 1

Abstract

During the production of electrical energy from coal-fired thermal power plants, calorific and unit
power values are the most important indicators for evaluating the productivity of the process.
These values are measured periodically, and the resulting measurements are monitored to detect
root causes of variation that may occur in production process. As this application is currently
performed by manual methods, the probability of obtaining incorrect results is quite high. This
study aims to statistically analyze process control on the variation of quality parameters and
detect root causes of unusual variations using Shewhart and cumulative sum control charts. For
this purpose, the usability of these control charts was tested on Afşin-Elbistan B thermal power
plant. As a result, these charts identified fluctuations in the efficiency of generating electrical
energy and unusual variations in the process. Furthermore, it is recommended that these control
charts could be developed and applied in similar type of process.

Keywords

Statistical process control, Control charts, Calorific value, Unit power

KÖMÜR YAKITLI TERMİK SANTRALLERDE KALİTE PARAMETRELERİNİN DEĞİŞİMİNİN İZLENMESİ İÇİN KONTROL GRAFİKLERİNİN KULLANILABİLİRLİĞİ

Abstract

Kömür yakıtlı termik santrallerden elektrik enerjisi üretimi sırasında prosesin verimliliğini
değerlendirmek için kalorifik değer ve birim güç değeri en önemli parametrelerdir. Bu değerler
periyodik olarak ölçülür ve ölçüm sonuçları üretim sürecinde ortaya çıkabilecek dalgalanmaların
temel nedenlerini tespit etmek için izlenir. Bu uygulama mevcut durumda manuel yöntemlerle
gerçekleştirildiğinden, hatalı sonuçların elde edilme olasılığı oldukça yüksektir. Bu çalışma,
Shewhart ve kümülatif toplam kontrol grafiklerini kullanarak kalite parametrelerinin değişimi
üzerindeki proses kontrolünü istatistiksel olarak analiz etmeyi ve olağandışı dalgalanmaların
temel nedenlerini tespit etmeyi amaçlamaktadır. Bu amaçla, bu kontrol grafiklerinin kullanılabilirliği
Afşin-Elbistan B termik santrali üzerinde test edilmiştir. Sonuç olarak, bu grafikler kullanılarak
elektrik enerjisi üretme verimliliğindeki dalgalanmaları ve süreçteki olağandışı değişimler
belirlenmiştir. Ayrıca, bu kontrol grafiklerinin geliştirilmesi ve benzer prosesler için de uygulanması
önerilmektedir.

Keywords

Enerji verimliliği, İstatistiksel proses kontrol, Kontrol grafikleri, Kalori değeri, Ünite gücü

References

• Abbas, N., Zafar, R. F., Riaz, M., Hussain, Z., 2013. Progressive Mean Control Chart for Monitoring Process Location Parameter. Quality and Reliability Engineering International 29(3): 357-367.
• Alcantara, M. S., Grisotti, G., Tavares, M. H. F., Gomes, S. D., 2017. Anaerobic Digestion Stability Test by Shewhart Control Chart. Engenharia Agricola 37(3): 618-626.
• Aldosari, M. S., Aslam, M., Khan, N., Jun, C. H., 2018. Design of a New Variable Shewhart Control Chart Using Multiple Dependent State Repetitive Sampling. Symmetry-Basel 10(11): 9.
• Bayat, O., Arslan, V., 2004. Statistical Analysis In Turkish Chromite Mining. Scandinavian Journal of Metallurgy 33(6): 322-327.
• Deniz, V., Umucu, Y., 2013. Application of Statistical Process Control for Coal Particle Size. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 35(14): 1306-1315.
• Dubinin, N. N., Kalinin, V. V., Kokovin, A. V., Guseva, O. S., Lapshina, S. N., Dolganov, A., Parusheva, S. S., Aip, 2018. Shewhart’s Control Charts in the Education Quality Management System. International Conference of Numerical Analysis and Applied Mathematics. Melville, Amer Inst Physics. 1978.
• Duclos, A., Touzet, S., Soardo, P., Colin, C., Peix, J. L., Lifante, J. C., 2009. Quality Monitoring In Thyroid Surgery Using the Shewhart Control Chart. British Journal of Surgery 96(2): 171-174.
• Ewan, W. D., 1963. When and How to Use Cu-Sum Charts. Technometrics 5(1): 1-22.
• Freitas, L. L. G., Henning, E., Kalbusch, A., Konrath, A. C., Walter, O., 2019. Analysis of Water Consumption in Toilets Employing Shewhart, EWMA, and Shewhart- Ewma Combined Control Charts. Journal of Cleaner Production 233: 1146-1157.
• Fu, X., Wang, R. F., Dong, Z. Y., 2017. Application of a Shewhart Control Chart to Monitor Clean Ash During Coal Preparation. International Journal of Mineral Processing 158: 45-54.
• Gan, F. F., 1991. An Optimal Design of CUSUM Quality Control Charts. Journal of Quality Technology 23(4): 279-286.
• Guo, R., Dunne, T., 2006. Grey Predictive Process Control Charts. Communications in Statistics - Theory and Methods 35(10): 1857-1868.
• Hachicha, W., Ghorbel, A., 2012. A Survey Of Control- Chart Pattern-Recognition Literature (1991-2010) Based on a New Conceptual Classification Scheme. Computers & Industrial Engineering 63(1): 204-222.
• Haq, A., 2018. A New Adaptive EWMA Control Chart For Monitoring the Process Dispersion. Quality and Reliability Engineering International 34(5): 846-857.
• Hawkins, D. M., 1981. A Cusum for a Scale Parameter. Journal of Quality Technology 13(4): 228-231.
• Hawkins, D. M., 1993. Cumulative Sum Control Charting: an Underutilized SPC Tool. Quality Engineering 5(3): 463-477.
• Lucas, J. M., 1976. The Design and Use of V-Mask Control Schemes. Journal of Quality Technology 8(1): 1-12.
• Montgomery, D. C., 2009. Introduction to Statistical Quality Control. USA, John Wiley & Sons Inc.
• Noorossana, R., Vaghefi, S. J. M., 2006. Effect of Autocorrelation on Performance of the Mcusum Control Chart. Quality and Reliability Engineering International 22(2): 191-197.
• Ottenstreuer, S., Weiss, C. H., Knoth, S., 2019. A Combined Shewhart-CUSUM Chart With Switching Limit. Quality Engineering 31(2): 255-268.
• Ou, Y. J., Wu, Z., Tsung, F., 2012. A Comparison Study of Effectiveness And Robustness of Control Charts for Monitoring Process Mean. International Journal of Production Economics 135(1): 479-490.
• Page, E. S., 1954. Continuous Inspection Schemes. Biometrika 41(1/2): 100-115.
• Page, E. S., 1961. Cumulative Sum Charts. Technometrics 3(1): 1-9.
• Shewhart, W. A., 1924. Some Applications of Statistical Methods to the Analysis of Physical and Engineering Data. Bell System Technical Journal 3(1): 43-87.
• Woodall, W. H., Adams, B. M., 1993. The Statistical Design of Cusum Charts. Quality Engineering 5(4): 559-570.
• Yerel, S., Ankara, H., Konuk, A., Ozdag, H., 2007. Preventive Maintenance Policy Supported By a Quality Control Chart and Kolmogorov-Smirnov Tests: Emet Colemanite Mineral Processing Plant Turkey. Mining, Metallurgy & Exploration 24(3): 152-156.