Water Tube Boiler Case Study

2873 Words12 Pages
INTRODUCTION 1.1 Background of Boiler Tube The purpose of boiler is to convert water into steam. The steam can be used for various usages such as driving an engine to generate electricity, heating purpose and for other industrial process applications. The boiler consists of several types, which include water tube boiler, fire tube boiler, packaged boiler, fluidized bed combustion (FBC) boiler, atmospheric fluidized bed combustion (AFBC) boiler and so forth. The most popular boilers that used in many industries are water tube and fire tube boiler. Water tube boiler is the one with water flowing through the tubes that enclosed in a furnace heated externally while fire tube boiler comprises of fire or hot flue gas directed through tubes surrounded by water. 1.2 Problem Statement 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…show more content…
[1] that has many experiences for the 25-years period ending in 1980 gives the list of the breakdown between mechanical and corrosion failure and further classify the various kinds of failures, locations, and materials. 81% of the boiler tube failure is due to mechanical, consist of high temperature failure (short time) 65.8%, creep (high temperature/long time) 8.6%, and others 6.6%, while boiler failures caused by corrosion is 19%. Viswanathan et al. [4] reported that the material behavior in contact with steam at high temperature is of general concern due to the formation of the oxide scales which in turn elevate the fireside metal temperature. As a consequence, as the metal temperature increases, the oxide layers develop more quickly El-Bataghy A-M. 5 In many cases these two mechanisms are related to each other in augmenting failure in boiler tubes. Long-term overheating is the net effect of formation of oxide deposit layers, which will lead to failure due to accelerated

More about Water Tube Boiler Case Study

Open Document