Abstract
The present paper deals with the opportunities for the modeling of flue gas and air system of a thermal power plant by making the performance evaluation using probabilistic approach. The present system of thermal plant under study consists of four subsystems with three possible states: full working, reduced capacity working and failed. Failure and repair rates for all the subsystems are assumed to be constant. Formulation of the problem is carried out using Markov Birth-Death process using probabilistic approach and a transition diagram represents the operational behavior of the system. Interrelationship among the full working and reduced working has been developed. A probabilistic model has been developed, considering some assumptions. Data in feasible range are selected from a survey of thermal plant and the effect of each subsystem on the system availability is tabulated in the form of availability matrices, which provides various performance/availability levels for different combinations of failure and repair rates of all subsystems. Based upon various availability values obtained in availability matrices and graphs of failure/repair rates of different subsystems, performance and optimum values of failure/repair rates for maximum availability, of each subsystem is analyzed and then maintenance priorities are decided for all subsystems.
Highlights
The thermal industry is becoming quite complex with a huge capital investment being incurred on process automation to enhance the reliability of system
It can be concluded that this availability model is effectively used for the analysis of availability and the evaluation of performance of various subsystems of flue gas and air system of thermal plant
It shows the relationship among various failure and repair rates (, ) for each subsystem of flue gas and air system of thermal plant
Summary
The thermal industry is becoming quite complex with a huge capital investment being incurred on process automation to enhance the reliability of system. According to Kumar and Pandey (1993), for efficient functioning, it is essential that various systems of the plant remain in upstate as far as possible During operation they are liable to fail in a random fashion. A thermal power plant is a complex engineering system comprising of various systems: coal handling, steam generation, cooling water, crushing, ash handling, power generation, feed water, steam & water analysis system and flue gas & air system. These systems are connected in complex configuration.
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