水管锅炉管温度分布,一参数化有限元方法研究UNITEN ICCBT 08 Tube Temperature Distribution in Water Tub.pdfVIP

ICCBT2008 Tube Temperature Distribution in Water Tube Boiler- A Parametric Study by Finite Element Method M. M. Rahman*, Universiti Tenaga Nasional, MALAYSIA Sukahar, Universiti Tenaga Nasional, MALAYSIA ABSTRACT This paper presents the application of finite element method (FEM) to analyze the tube temperature distribution in a water tube boiler. Two-dimensional (2-D) finite element models are developed where the axi-symmetric triangular elements for the cross section area along the water tube are applied in computer software namely MSC Patran-Nastran. The analysis of the temperature distribution for every location inside the domain is conducted by setting constant heat fluxes and varying parameters such as mass flow rate of steam, material properties of the tube, steam inlet temperature, and scale thickness. The results showed that the temperature distribution at the tube wall decreases due to increasing of mass flow rate of steam, decreasing thermal conductivity of tube, steam inlet temperature, and increasing scale thickness. Keywords: finite element method, water tube boiler, temperature profile, mass flow rate. *Corresponding Author: Assoc. Prof. Dr. Md. Mujibur Rahman, Universiti Tenaga Nasional, Malaysia. Tel: +60389297269, Fax: +60389212116. E-mail: mujibur@.my ICCBT 2008 - F - (14) – pp157-170 Tube Temperature Distribution in Water Tube Boiler- A Parametric Study by Finite Element Method 1. INTRODUCTION The common causes of the metallurgical failure of the tubes in water tube boiler are due to tube temperature higher than expected in the original design. Tube temperature increases slowly over many years or rapidly caused either by loss of internal steam or water flow. Internal oxide scale or