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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.1 pp.11-15
DOI : https://doi.org/10.3740/MRSK.2019.29.1.11

Flow-Accelerated Corrosion Analysis for Heat Recovery Steam Generator in District Heating System

Minki Hong1, Hobyung Chae1, Youngsu Kim1, Min Ji Song1, Jeongmin Cho1, Woo Cheol Kim2, Tae Baek Ha2, Soo Yeol Lee1†
1Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
2Frontier Research & Training Institute, Korea District Heating Corporation, Yongin 17099, Republic of Korea
Corresponding author
E-Mail : sylee2012@cnu.ac.kr (S. Y. Lee, Chungnam Nat’l Univ.)

Abstract

Severe wall thinning is found on the tube of a low-pressure evaporator(LPEVA) module that is used for a heat recovery steam generator(HRSG) of a district heating system. Since wall thinning can lead to sudden failure or accidents that lead to shutdown of the operation, it is very important to investigate the main mechanism of the wall thinning. In this study, corrosion analysis associated with a typical flow-accelerated corrosion(FAC) is performed using the corroded tube connected to an upper header of the LPEVA. To investigate factors triggering the FAC, the morphology, composition, and phase of the corroded product of the tube are examined using optical microscopy, scanning electron microscopy combined with energy dispersive spectroscopy, and x-ray diffraction. The results show that the thinnest part of the tube is in the region where gas directly contacts, revealing the typical orange peel type of morphology frequently found in the FAC. The discovery of oxide scales containing phosphate indicates that phosphate corrosion is the main mechanism that weakens the stability of the protective magnetite film and the FAC accelerates the corrosion by generating the orange peel type of morphology.

지역난방 배열 회수 보일러의 유동 가속 부식 원인 고찰

홍민기1,채호병2,김영수1,송민지1,조정민1,김우철2,하태백,이수열1†
1충남대학교 신소재공학과,2한국지역난방공사 미래개발원

초록

 

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