Materials and Manufacturing Challenges for Compact Heat Exchangers of Supercritical CO2 Power Cycles
Conference
·
OSTI ID:1571297
- National Energy Technology Lab. (NETL), Albany, OR (United States); brian.fronk@oregonstate.edu
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- Oregon State Univ., Corvallis, OR (United States)
The supercritical CO2 (sCO2) power cycles rely heavily on heat recuperation to increase efficiency. Compact heat exchangers are proposed to reduce equipment size and enhance heat transfer between heat source and sCO2. Microchannel architectures in these heat exchangers are typically formed by a lamination process wherein channels are formed in layers of sheet material, which are then stacked and joined together using diffusion bonding, brazing, or transient-liquid-phase bonding (TLPB). TLPB of Ni-based superalloy (Alloy 230) sheets into stacks was investigated. Electron microscopy identified solidification shrinkage porosity on the bond line as the most common defect in the TLP bonded stacks. Tensile yield strengths of 76-86 % of the base alloy strength were obtained on bonded stacks. Scanning electron microscopy on the fracture surfaces indicated ductile failure mode in the bonded zone. Environmental stability of joined regions in Alloy 230 stacks was investigated by exposing to CO2 at 700°C for 1500 hours. Mass change and post-exposure microscopic analysis showed a corrosion behavior similar to the base material.
- Research Organization:
- Oregon State University
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
- DOE Contract Number:
- EE0007108
- OSTI ID:
- 1571297
- Country of Publication:
- United States
- Language:
- English
Similar Records
Practical Challenges and Failure Modes During Fabrication of Haynes 230 Micro-Pin Solar Receivers for High Temperature Supercritical Carbon Dioxide Operation
On-Sun Characterization of Microchannel Supercritical Carbon Dioxide Solar Thermal Receivers - Preliminary Findings
Creep and Fatigue Characterization of High Strength Alloy Thin Sections in Advanced CO2 Heat Exchangers
Conference
·
Fri Sep 20 00:00:00 EDT 2019
·
OSTI ID:1571877
On-Sun Characterization of Microchannel Supercritical Carbon Dioxide Solar Thermal Receivers - Preliminary Findings
Conference
·
Wed Jul 17 00:00:00 EDT 2019
·
OSTI ID:1571296
Creep and Fatigue Characterization of High Strength Alloy Thin Sections in Advanced CO2 Heat Exchangers
Technical Report
·
Fri May 27 00:00:00 EDT 2022
·
OSTI ID:2349243