Reliability Assessment of Cogeneration Power Plant in Textile Mill Using Fault Tree Analysis
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TECHNICAL ARTICLE—PEER-REVIEWED
Reliability Assessment of Cogeneration Power Plant in Textile Mill Using Fault Tree Analysis Vallem Ramesh • R. Saravannan
Submitted: 2 June 2010 / in revised form: 27 September 2010 / Published online: 2 December 2010 ASM International 2010
Abstract The Combined Heat and Power (CHP) Systems are systems that simultaneously generate both electricity and useful heat. It is important to analyze the reliability of these systems to ensure the lowest level of life cycle cost. A CHP system installed in a textile mill is considered as a case study to assess the reliability through fault tree analysis (FTA). The common cause failures (CCFs) are evaluated using the b-factor model with the available data on the failure of the plant. On a detailed analysis, it is found that the unavailability of the plant is 8.50E03, which is predominantly caused by the problems related to mechanical system, subsystems of boiler, and turbine. The repair and the restoration times for these components used in the fault tree analysis (FTA) are 48 and 8 h, respectively. Hence, faster restoration of these components affected by shutdown/failure and implementation of reliability-centered maintenance (RCM) features will significantly improve the reliability of the system, thereby reducing the time with respect to return on the investment.
r P Q q Tr MTBF MTTR CCF MCS Ti Tf BE VCB MVA CHP FTA RCM PM
Mean failure rate of a component, h1 Availability Mean unavailability of a component [Q-Factor = (1 Availability)] Demand failure probability Time taken to repair a component, h Mean time between failures Mean time to repair Common cause failure Minimum cut set Testing Frequency Time to first failure, h Basic events Vacuum circuit breaker Mega volt ampere Combined heat and power Fault tree analysis Reliability-centered maintenance Preventive maintenance
Keywords Fault tree analysis Common cause failures Minimal cut set Introduction Nomenclature k Failure rate b Parametric factor c Component having two modes, i.e., working or failed lc Component failure rate mc Component repair rate V. Ramesh R. Saravannan (&) Refrigeration and Air Conditioning Laboratory, Department of Mechanical Engineering, Anna University, Chennai, India e-mail: [email protected]
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Cogeneration is defined as the combined generation of electric (or mechanical) and thermal energy from the same initial energy source, and total fuel consumption is significantly reduced when ‘‘cogeneration’’ or ‘‘combined heat and power’’ (CHP) is applied. The overall performances of any engineering systems depend on the operating conditions of their constitutive individual elements. The economic, eco-friendly and energy-efficient solutions are the key design constraints based on which one should aim for an optimum solution for any engineering problem. The attainment of an optimum solution corresponds to a
J Fail. Anal. and Preven. (2011) 11:56–70
compromise reached from among different criteria and reflects a sustainability of engineering decision
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