Evaluation of nitrous oxide as a substitute for sulfur hexafluoride to reduce global warming impacts of ANSI/HPS N13.1 gaseous uniformity testing
| Autor: | J. Matthew Barnett, Brett G. Amidan, Kurtis P. Recknagle, Julia E. Flaherty, Ernest J. Antonio, Xiao-Ying Yu, John A. Glissmeyer |
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| Rok vydání: | 2018 |
| Předmět: |
Atmospheric Science
Nuclear engineering Mixing (process engineering) Context (language use) Nitrous oxide 030218 nuclear medicine & medical imaging Volumetric flow rate Sulfur hexafluoride 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine chemistry Stack (abstract data type) 030220 oncology & carcinogenesis Greenhouse gas TRACER Environmental science General Environmental Science |
| Zdroj: | Atmospheric Environment. 176:40-46 |
| ISSN: | 1352-2310 |
| DOI: | 10.1016/j.atmosenv.2017.12.015 |
| Popis: | The ANSI/HPS N13.1–2011 standard requires gaseous tracer uniformity testing for sampling associated with stacks used in radioactive air emissions. Sulfur hexafluoride (SF6), a greenhouse gas with a high global warming potential, has long been the gas tracer used in such testing. To reduce the impact of gas tracer tests on the environment, nitrous oxide (N2O) was evaluated as a potential replacement to SF6. The physical evaluation included the development of a test plan to record percent coefficient of variance and the percent maximum deviation between the two gases while considering variables such as fan configuration, injection position, and flow rate. Statistical power was calculated to determine how many sample sets were needed, and computational fluid dynamic modeling was utilized to estimate overall mixing in stacks. Results show there are no significant differences between the behaviors of the two gases, and SF6 modeling corroborated N2O test results. Although, in principle, all tracer gases should behave in an identical manner for measuring mixing within a stack, the series of physical tests guided by statistics was performed to demonstrate the equivalence of N2O testing to SF6 testing in the context of stack qualification tests. The results demonstrate that N2O is a viable choice leading to a four times reduction in global warming impacts for future similar compliance driven testing. |
| Databáze: | OpenAIRE |
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