Failure Analysis and Performance Assessment of Tubular Air Heater at PLTU South Sumatra V

DOI

10.2991/ahe.k.210205.040How to use a DOI?

Keywords

Tubular air heater, boiler, acid dew point

Abstract

Tubular air heater has a design operational lifespan limit. This lifespan limit, if not monitored and controlled, can accelerate any damage. Tubular air heater damage will result in tube failures that affect the boiler heat transfer system and emission control. This research aims to find out the root cause of tube failure. This research analyses the physical failure mechanism related to the material: chemical composition test, hardness test, tensile test, metallography examination, SEM-EDX examination, and x-ray diffraction analysis. The failure mode analysis concluded that the tubes were attacked by sulphuric acid condensation due to the air heater tubes temperature drops below the sulphuric acid dew point temperature. The existing tubes material is Corten Steel, which has good atmospheric resistance but low in the acidic environment. One thousand two hundred tubes replaced with ND Steel, the ideal steel for sulphuric acid-resistant and 3,986 tubes used carbon steel. There is no air heater performance degradation after tubes replacement, indicated after two weeks outages at high load. The leakage significantly decreases from 64% to approximately 19%.

Copyright

© 2021, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Lulu Khoirunnisa
AU  - Hasan Basri
PY  - 2021
DA  - 2021/02/09
TI  - Failure Analysis and Performance Assessment of Tubular Air Heater at PLTU South Sumatra V
BT  - Proceedings of the 4th Forum in Research, Science, and Technology (FIRST-T1-T2-2020)
PB  - Atlantis Press
SP  - 223
EP  - 228
SN  - 2589-4943
UR  - https://doi.org/10.2991/ahe.k.210205.040
DO  - 10.2991/ahe.k.210205.040
ID  - Khoirunnisa2021
ER  -