[논문]배열회수보일러 고압 슈퍼히터 튜브 열화도 평가

송민지; 최가현; 채호병; 김우철; 김희산; 김정구; 이수열

doi:10.14773/cst.2022.21.2.130

배열회수보일러 고압 슈퍼히터 튜브 열화도 평가
Degradation Evaluation of High-Pressure Superheater Tube in Heat Recovery Steam Generator 원문보기

Corrosion science and technology, v.21 no.2, 2022년, pp.130 - 137

송민지 (충남대학교 신소재공학과) , 최가현 (충남대학교 신소재공학과) , 채호병 (충남대학교 신소재공학과) , 김우철 (한국지역난방공사 미래개발원) , 김희산 (홍익대학교 재료공학과) , 김정구 (성균관대학교 신소재공학부) , 이수열 (충남대학교 신소재공학과)

Abstract ▼ AI-Helper

In this work, the degradation of high-pressure superheater tubes exposed to the flame of a duct burner in a heat recovery steam generator of a district heating system was evaluated. To assess the deterioration of the used superheater tube, the microstructure, microhardness, and tensile properties were investigated by comparison to an unused tube. The study found that a fin bound at the outer surface of the used tube became fragile only in the location facing the flame. This indicates that the tube was directly exposed to the flame from the duct burner or underwent abnormal overheating. While the unused tube showed a uniform value in hardness and equiaxial grain structure, the used tube revealed a decrease in hardness up to 105 HV and an increase in grain size with a plate-like morphology in the location facing the flame. The coarsening of the grain structure by the flame weakened the mechanical properties of yield strength, tensile strength, and elongation.

주제어

표/그림 (14)

그림 Fig. 1. Schematic diagram of the high-pressure superheater and location of the collected tube samples
그림 Fig. 2. Deteriorated high-pressure superheater tube samples; specimen geometry (a) for hardness and microstructural investigation and (b) for the tensile test
그림 Fig. 3. Visual inspection of deteriorated high pressure superheater fin tube; (a) fin discolored in a specific direction (fin of tube 1-5) and (b) crumble due to deterioration (fin of tube 3-3)
표 Table 1. Nominal chemical composition of ASME T91 tube and AISI 409SS fin [unit: wt%]
표 Table 2. Mechanical properties of ASME T91 tube
그림 Fig. 4. Contour map for the hardness test result of tube cross-section samples; (a) unused tube, (b) tube 1-5, (c) tube 2-4, (d) tube 3-3, (e) tube 4-1, and (f) tube 4-2
표 Table 3. Minimum data of hardness test measurements of each cross-section tube sample [unit: HV]
표 Table 4. Average data of hardness test measurements of each cross-section tube sample [unit: HV]
그림 Fig. 4. Continued
그림 Fig. 5. Strain-stress curves for the specimens machined in the locations corresponding to the hardness measurement positions in the unused tube (250 HV) and the used tubes (200 HV, 150 HV, 120 HV)
그림 Fig. 6. Optical microscope images measured at 6 o'clock direction of the unused and used cross-section tube sample
표 Table 5. Mechanical properties for unused (250 HV) and used (200 HV, 150 HV, 120 HV) tubes
그림 Fig. 7. SEM microstructure at the optical microscope image locations of the unused tube (Fig. 6b) and used tube (Fig. 6f)
$Table 6. The average size and area fraction of the precipitates shown in the microstructure of Fig. 7$ 표 Table 6. The average size and area fraction of the precipitates shown in the microstructure of Fig. 7

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