2023-08-22 ロスアラモス国立研究所(LANL)
◆研究によれば、水素を天然ガスパイプラインに徐々に注入することで、安全で予測可能な運用が可能であることが示されました。この研究は、燃料電池などで利用されるクリーンな水素の利用を促進し、炭素排出を削減するための有望な方法として注目されています。
＜関連情報＞
- https://discover.lanl.gov/news/0822-gas-pipelines/
- https://journals.aps.org/prxenergy/abstract/10.1103/PRXEnergy.2.033008
パイプラインネットワークにおけるガス混合ダイナミクスにおける単調性からカオスへの遷移 Transitions From Monotonicity to Chaos in Gas Mixture Dynamics in Pipeline Networks
Luke S. Baker, Saif R. Kazi, and Anatoly Zlotnik
PRX Energy Published 9 August 2023
DOI:https://doi.org/10.1103/PRXEnergy.2.033008
ABSTRACT
The blending of hydrogen generated using clean energy into natural gas pipeline networks is proposed in order to utilize existing energy systems for their planned lifetimes while reducing their reliance on fossil fuels. We formulate a system of partial differential equations (PDEs) that govern the flow dynamics of mixtures of gases in pipeline networks under the influence of time-varying compressor and regulator control actions. The formulation is derived for general gas networks that can inject or withdraw arbitrary time-varying mixtures of gases into or from the network at arbitrarily specified nodes. The PDE formulation is discretized in space to form a nonlinear control system that is used to prove that homogeneous mixtures are well behaved and that heterogeneous mixtures may be ill behaved in the sense of monotone ordering of solutions. We use numerical simulations to compute interfaces in the parameter region of sinusoidal boundary conditions that delimit monotonic, periodic, and chaotic system responses. The interfaces suggest that any solution in the monotonic response region is not chaotic and will eventually approach a periodic orbit. The results are demonstrated using examples for a single pipeline and a small test network.
