The effects of thermal spreaders on reducing thermal cracks in heat recovery steam generators

Seok Min Choi, Hokyu Moon, Seon Ho Kim, Jun Su Park, Hyung Hee Cho

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Thermal cracks occur on heat recovery steam generator (HRSG) casing, leading to heat loss. The possibility of reducing the number of thermal cracks appearing in HRSG casing with the use of thermal spreaders was investigated. Before designing thermal spreader, measuring temperature and numerical analysis were performed to find the reason of thermal cracks in HRSG. Temperatures were measured at different heights on the HRSG casing, enabling to determine the temperature gradient in the casing. The largest temperature gradient occurred toward the lower region of the HRSG casing. Then, the highest thermal stress and thermal cracks were showed in this lower region due to the large temperature gradient. To reduce thermal stress in this region, thermal spreader which has large thermal conductivity was designed. Designed thermal spreaders were installed on the HRSG casing to reduce the temperature gradient of the HRSG casing. Where thermal spreaders were used, the average temperature gradient of the HRSG casing decreased from 52 °C to 16 °C. The maximum thermal stress was reduced by 16% and the average thermal stress was reduced by 26%.

Original languageEnglish
Pages (from-to)1251-1260
Number of pages10
JournalApplied Thermal Engineering
Publication statusPublished - 2016 Sept 5

Bibliographical note

Funding Information:
This work was supported by the Human Resources Development program (No. 20144030200560 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy . This work was also supported by the Technological Innovation R&D Program ( S2139408 ) funded by the Small and Medium Business Administration (SMBA, Korea).

Publisher Copyright:
© 2016 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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