[논문]우드칩을 연료로 하는 열병합발전소의 회분 퇴적 및 설비 고장 원인 분석

송민지; 김우철; 김희산; 김정구; 이수열

doi:10.14773/cst.2023.22.3.187

[국내논문] 우드칩을 연료로 하는 열병합발전소의 회분 퇴적 및 설비 고장 원인 분석
Investigating the Cause of Ash Deposition and Equipment Failure in Wood Chip-Fueled Cogeneration Plant 원문보기

Corrosion science and technology, v.22 no.3, 2023년, pp.187 - 192

송민지 (충남대학교 신소재공학과) , 김우철 (한국지역난방공사 플랜트기술처 플랜트관리.QC부) , 김희산 (홍익대학교 나노신소재학과) , 김정구 (성균관대학교 신소재공학부) , 이수열 (충남대학교 신소재공학과)

Abstract ▼ AI-Helper

The use of biomass is increasing as a response to the convention on climate change. In Korea, a method applied to replace fossil fuels is using wood chips in a cogeneration plant. To remove air pollutants generated by burning wood chips, a selective denitrification facility (Selective catalytic reduction, SCR) is installed downstream. However, problems such as ash deposition and descaling of the equipment surface have been reported. The cause is thought to be unreacted ammonia slip caused by ammonia ions injected into the reducing agent and metal corrosion caused by an acidic environment. Element analysis confirmed that ash contained alkali metals and sulfur that could cause catalyst poisoning, leading to an increase in the size of ash particle and deposition. Measurement of the size of ash deposited inside the facility confirmed that the size of ash deposited on the catalyst was approximately three times larger than the size of generally formed ash. Therefore, it was concluded that a reduction in pore area of the catalyst by ash deposition on the surface of the catalyst could lead to a problem of increasing differential pressure in a denitrification facility.

주제어

표/그림 (8)

그림 Fig. 1. Design diagram for combined heat and power generation using wood chips as fuel
표 Table 1. Nominal chemical composition of SS275 (KS D 3503, ASTM)
그림 Fig. 2. Facility on-site inspection results: (a) SCR facility wall and H shaped beam, (b) close-up view of SCR facility wall, (c) H-beam, (d) close-up view of H-beam surface
그림 Fig. 3. Facility on-site inspection results: (a) SCR facility wall and catalyst, (b) ash deposition on the catalyst
표 Table 2. EDS analysis result of ash samples (unit: wt%)
그림 Fig. 4. Facility on-site inspection results: (a) ash at ESP, (b) ash on the catalyst, (c) surface oxides of the wall, (d) surface oxides of H shaped beam
표 Table 3. IC and ICP result of ash samples (unit: ppm)
그림 Fig. 5. Mechanisms of ammonia slip formation in SCR facility system

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