Hot corrosion resistance of gas turbine materials in combusted syngas environments

Abstract

To reduce CO₂ emissions, there is interest in a new generation of industrial gas turbines operating in advanced integrated gasification combined cycles (IGCC) with the option for pre-combustion CO₂ removal systems. These gas turbines may be fired on syngas, cleaned H₂ rich syngas, or natural gas, and this will alter the hot corrosion experienced by components in the hot gas path. Deposit recoat laboratory tests have looked at the response of 11 state-of-the-art materials systems under the expected IGCC conditions. MTData has been used to calculate the optimal deposits under the temperature and gas conditions for these tests. Studies of metal loss have helped assess quantitatively the resistance of the different materials systems, while microscopy techniques have given information on the degradation mechanisms experienced. Rene 80 has been selected to demonstrate the data from these tests and shows the most significant metal loss under partially cleaned syngas conditions.

Keywords:

• Hot corrosion
• Deposit
• Lifetime prediction
• Superalloy
• Gas turbine
• H₂ rich
• IGCC
• CCS

Acknowledgement

The authors would like to acknowledge the support of the European Union’s Framework 7 H2-IGCC project (grant number FP7-239349).