RAM investigation of coal-fired thermal power plants: A case study

Abstract: Continuous generation of electricity of a power plant depends on the higher availability of its components/equipments. Higher availability of the components/equipments is inherently associated with their higher reliability and maintainability. This paper investigates the reliability, availability and maintainability (RAM) characteristics of a 210 MW coal-fired thermal power plant (Unit-2) from a thermal power station in eastern region of India. Critical mechanical subsystems with respect to failure frequency, reliability and maintainability are identified for taking necessary measures for enhancing availability of the power plant and the results are compared with Unit-1 of the same Power Station. Reliability-based preventive maintenance intervals (PMIs) at various reliability levels of the subsystems are estimated also for performing their preventive maintenance (PM). The present paper highlights that in the Unit-2, Economizer (ECO) & Furnace Wall Tube (FWT) exhibits lower reliability as compared to the other subsystems and Economizer (ECO) & Baffle Wall Tube (BWT) demands more improvement in maintainability. Further, it has been observed that FSH followed Decreasing Failure Rate (DFR) and Economizer (ECO) is the most critical subsystem for both the plants. RAM analysis is very much effective in finding critical subsystems and deciding their preventive maintenance program for improving availability of the power plant as well as the power supply.

How to cite this paper

 Bose, D., Chattopadhyay, S., Bose, G., Adhikary, D & Mitra, S. (2012). RAM investigation of coal-fired thermal power plants: A case study.International Journal of Industrial Engineering Computations , 3(3), 423-434.

Refrences

Arora, N. & Kumar, D. (1993). Maintenance planning and management of coal crushing system in the thermal power plant. Proceedings of the ORSI 26th Convocation. Bhubaneshwar, India.

Arora, N., Kumar, D. & Yadav, V. (1995). Reliability analysis and maintenance planning of coal conveyor system in a thermal power plant. Proceedings of AIEPIT, Allahabad, India, 13-18.

Arora, N. & Kumar, D. (1997). Availability analysis of Steam and Power Generation Systems in the Thermal Power Plant. Microelectronics Reliability, 37 (5), 795-799.

Arora, N. & Kumar, D. (1997). Stochastic analysis and maintenance planning of the ash handling system in the thermal power plant. Microelectronics and Reliability, 37 (5), 819-824.

Adhikary, D.D., Bose, G.K., Mitra, S. and Bose, D. (2010). Reliability, Maintainability & Availability analysis of a coal fired power plant in eastern region of India, Proceedings of the 2nd International Conference on Production and Industrial Engineering (CPIE 2010), NIT, Jalandhar, India, 1505-1513.

Behera, S.K. & Dash, A.P. (2010). Performance Analysis of Coal fired Power Plants in India. Proceedings of the 2010 International Conference on Industrial Engineering and Operations Management, Dhaka, Bangladesh.

Barabady, J. (2005). Reliability and maintainability analysis of crushing plants in Jajarm bauxite mine of Iran. Proceedings of the Annual Reliability and Maintainability Symposium, USA, 2005, 109-115.
Barabady, J. & Kumar, U. (2008). Reliability analysis of mining equipment: a case study of a crushing plant at Jajram Bauxite Mine in Iran. Reliability Engineering and System Safety, 93 (4), 647-653

Ebeling, C. (2008). An Introduction to Reliability and Maintainability Engineering, 10th ed., Tata McGraw-Hill, New Delhi, India.

Ghasrchami, K. B., Price, J.W.H. & Mathew, J. (1998). Optimum inspection frequency for manufacturing systems. International Journal of Quality & Reliability Management, 15 (3), 250-258.

Kumar, U. & Kelefsj?, B. (1992). Reliability analysis of hydraulic system of LHD machine using the power low process model. Reliability Engineering and System Safety, 35, 217-224.

Kaushik, S. & Singh, I.P.(1994). Reliability analysis of the feed water system in a thermal power plant. Microelectronics Reliability, 34 (4), 757-759.

Okumura, S. & Okino, N. (2003). An inspection policy for a stochastically failing single-unit system. Procedings of Eco Design-2003: Third International Symposium on Environmentally Conscious Design and Inverse Manufacturing, Tokyo, Japan, 137-140.

Purbolaksono, J., Ahmad, J., Khinani, A., Ali, A.A., & Rashid, A.Z. (2010). Failure case studies of SA213-T22 steel tubes of boiler through computer simulations. Journal of Loss Prevention in the Process Industries, 23 (1), 98-105.

Rahman, M.M., Purbolaksono, J. & Ahmad, J. (2010). Root cause failure analysis of a division wall superheater tube of a coal-fired power station. Engineering Failure Analysis, 17 (6), 1490-1494.

Rigdon, S.E. & Basu, A.P. (2000). Statistical Methods for the Reliability of Repairable Systems, John Wiley & Sons, Inc, USA.

Rajasankar, J., Iyer, N.R. & Appa Rao, T.V.S.R. (2003). Structural integrity assessment of offshore tubular joints based on reliability analysis. International Journal of Fatigue, 25, 609–619.

Shu, L., Lingen, C., Jin,J., Yu, J., Sun, F., & Wu.C. (2005). Functional reliability simulation for a power- station’s steam-turbine. Applied Energy, 80(1), 61-66.

Samanta, B., Sarkar, B., & Mukherjee, S.K. (2000). Reliability, Availability & Maintainability (RAM) of heavy earth moving machinery in an open cast mine. Minetech, 21 (5), 15-19.

Woo, Thomas G. (1980). Reliability analysis of a fluidized-bed boiler for a coal-fueled power plant. IEEE Transactions on Reliability, 29 (5), 422-424.