Advancement of Supercritical Carbon Dioxide Technology through Round Robin Testing and Fundamental Modeling

Abstract

is a Technical Executive at Electric Power Research Institute (EPRI). EPRI provided round robin samples to all participants and served in an advisory role at meetings and workshops.

The Impact of Impurities on Alloy Behavior in Supercritical CO2 at 700 °C

“…As a final note on the round robin, Table 2 shows that for the second run in this study, the measured rates for the highly alloyed materials were similar to two other institutions where the data were readily available for calculating rate constants. There was some variation in the total mass gain [15], i.e. the transient behavior, which may reflect differences in the heating rate and starting procedures as the specimen composition and surface preparation were the same for all participants.…”

“…Specimens for the round-robin testing were all prepared by one organization. The four commercial alloys (measured compositions shown in Table 1 [15]) were machined into parallelepiped specimens (~19 x 19 x 2 mm) and polished to a 600-grit finish. Six specimens of each alloy were exposed in each experiment.…”

“…It was later discovered that air was trapped in a tubing segment at the start of each cycle. The tubing was removed for a second series of experiments using similar specimens exposed for the same conditions and lower mass gains were measured, consistent with the other round robin participants [15]. The goal of this study was to characterize the reaction products in each case and determine the differences between the two sets of specimens.…”

“…In order to compare the data coming from various sources, a round-robin experiment was designed with five participating institutions [15]. For the exposures at 700°C in 20 MPa research grade (RG) CO2 for 1500 h (3, 500-h cycles), the mass gains for the experiments run at Oak Ridge National Laboratory (ORNL) were consistently higher than the other institutions and higher than previous ORNL experiments [8].…”

Development of an Open-source Alloy Selection and Lifetime Assessment Tool for Structural Components in CSP

“…An example of the recorded mass change data at 750 ℃ in atmospheric (1 bar) and high pressure (300 bar) sCO 2 up to 10,000h is shown in Figure 1. Tucker et al [15] summarized various data sources and reported mass change behavior of 625 and 740H in 200 bar sCO 2 and this is summarized in Figure 2. Holcomb et al [24] conducted tests in sCO 2 at 730 ℃ and 207 bar and compared measured oxidation kinetics with values in the literature.…”