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International Journal of Applied Research in Mechanical Engineering

Abstract

This paper presents an approach for the optimization of air preheater design with inline tube arrangement. The poor performance of an air preheater in the modern power plants is one of the main reason for higher unit heat rate & is responsible for deterioration in boiler efficiency. The main problem of air preheater is the leakage of air to the flue gas side & thereby resulting in poor thermal performance. The higher ash content in Indian coal also adds to the problems associated with tubular air preheater. Air preheaters are designed to meet performance requirements with consideration of highly influencing parameters viz. heat transfer, leakage and pressure drop. In the present work the performance of tubular air preheater is evaluated with the help of Computational Fluid Dynamics (CFD) analysis for In-line tube arrangement for evaluating influence of various parameters viz. Gas flow rate, Gas temperature, tube pitch, etc. The model can also be used while selecting a new type of surface geometry for optimizing the design of air-preheater.

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