Abstract
The aim of this study is to investigate the boiler tube failure mechanism using finite element analysis and experimental Analysis. The numerical software used is ANSYS steady-state thermal and static structural analysis. The independent variable for the analysis is temperature from flue gas and wall thickness of boiler tube. The scope of the study is to determine the temperature distribution, von mises stress, deformation and safety factor by implemented design of experiment. The material of boiler tube sketch in two dimensional for simulation is SA210 Grade C. this is standard requirements for the boiler made of seamless medium-carbon steel with superheater tubes according to ASTM. From the result and discussion, the potential of failure mechanism will determine upon independent variables. In addition, hoop stress or circumference stress will help to support the statement of failure of boiler tube.
Highlights
There are 2 types of boilers, fire tube that flue gas flows through the tubes and water tube that water or steam or both flows through tubes
The boiler water tube is mainly used to absorb the radiation heat generated by flame and high temperature flowing gas in the furnace and has a function of cooling and protecting the furnace wall [1]
Failure of water wall tube is the main reason of boiler shutdown
Summary
Boiler classification can be divided based on fuel type, application, firing method, the pressure of steam and so on. The coils divided into 4 groups which water wall tube, superheat, reheat and economizer These group designed to specific function and operating condition. The boiler water tube is mainly used to absorb the radiation heat generated by flame and high temperature flowing gas in the furnace and has a function of cooling and protecting the furnace wall [1]. Recent investigation and study have been concerned with report of failure cases in power plant associated with high temperature and corrosion factors. Overheating is another main reason for premature rupture of reheater and superheater tubes [4]. The objective of this study is to discuss the failure in boiler tube in the steam power plant.
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