International Journal of Applied Research in Mechanical Engineering IJARME
ISSN: 2231-5950
Abstracting and Indexing
IJARME Vol.1,Iss.3-2012
Optimization of Air Preheater Design for the Enhancement of Heat Transfer Coefficient
P. N. Sapkal
Department of Mechanical Engineering, Rajarshi Shahu College of Engineering, Pune-411033
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.
Recommended Citation
1] Staseik J.A., “Experimental studies of heat transfer and fluid flow across undulated heat exchanger surfaces”, Int. J. Heat Transfer. Vol. 41 Nos. 6-7, 1998, pp. 899-914. [2] T. Skiepko, “Effect of reduction in seal clearances on leakages in a rotary heat exchanger”, Heat recovery system CHP 9 (6), 1989, pp. 553-559. [3] Rakesh Kumar & Sanjeev Jain, “Performance Evaluation of air pre heater at off design condition”, Dept of Mech. Engg., IIT, New Delhi, pp.1-4. [4] “Steam Book”, The Babcock & Wilcox Company, 2006, pp.20-7. [5] Donald Kern, “Process Heat Transfer”, 2004 Tata McGraw-Hill Publication, pp. 701. [6] Rodney R. Gay, “Power Plant Performance monitoring”, 2004, pp.433. [7] Dr. R. K. Bansal, “Fluid mechanics and Hydraulic machines” Laxmi Publications (P) Ltd, R. K. Gupta, New Delhi, 1983, pp.15-47. [8] Suhas V. Patankar, “Numerical Heat Transfer and Fluid Dynamics”, Taylor and Francis, 1980, pp.151-154. [9] John D Anderson, “Computational Fluid Dynamics the basics and application”, McGrawHill, Dept. of Aerospace Engineering, University of Maryland, 1995, pp.60-95.