International Journal of Advanced Innovative Technology in Engineering (IJAITE)

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Analysis of Superheater of Boiler in View of Boiler Tube Leakage

MISS. ANKITA A. ISAL, PROF. R. K. KULKARNI

Abstract :

All the Thermal Power Plants are struggling with the problem of boiler tube leakage. The consequences of which affects the working of power plant and national income in general. The purpose of this project is to study boiler tube leakage problem in the superheater and try to find the causes of tube leakages and suggest remedies. In this project report the general working of the superheater has been explained in brief. Causes of boiler tube failure and the study of trend of failure has been mentioned in this report with the remedies. It was noticed from the plant data that the flue gas erosion is the major cause for the boiler tube leakage and hence some advanced preventive methods for erosion has been studied in this report. It was also found from the trends of failure that the superheater and reheater are the zones where the leakages are found more. A 2-D modeling of final superheater is performed and flow of the flue gases over the coils has been observed. Also the temperature, pressure and velocity field within a superheater using the actual boundary conditions has been studied. With the CFD analysis of superheater, it is observed that the velocity of the steam and flue gases near the U-tube bend found more. Also the temperature plot shows that the high temperature affecting zone is the tube U-bends of the superheater. The CFD results can be useful for the maintenance engineer to make suitable prediction of the tube life and make suitable arrangement for the high temperature zone to reduce the erosion of tube coil and restricting the tube leakage problem.

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