Experimental and Numerical Study of Catalyst Temperature in Passive Autocatalytic Recombiner at Elevated Hydrogen Concentrations
Abstract
This study investigates hydrogen catalytic recombination in a passive autocatalytic recombiner (PAR) at elevated hydrogen concentrations of 6-8 vol % in air. A combined experimental and numerical approach was used to test and characterize a cylindrical-type PAR catalyst for thermal response, conversion efficiency, and ignition threshold. Catalyst temperature and hydrogen concentration were studied in a small-scale facility, called the recombiner section testing station (RSTS), and compared with computational fluid dynamics (CFD) simulations. The model was developed and validated against experimental data in STAR-CCM+ software and incorporated the detailed heterogeneous and homogeneous reaction mechanisms from CHEMKIN kinetics simulation software. Experimental results showed a stable catalyst surface temperature with a maximum of 370-440 °C and hydrogen conversion efficiencies of ∼70%. Verification of turbulence models (k-ε and k-ω families) demonstrated a notable influence on temperature and species distribution, while neglecting thermal radiation led to overprediction of temperatures. The proposed CFD model demonstrated prediction with a deviation of 5% for catalyst temperature and 15% for hydrogen conversion. The model enabled evaluation of the ignition threshold by comparing the hydrogen reaction rate on the catalyst surface and in the gas phase. The onset of gas-phase hydrogen combustion was numerically calculated at 6 vol % of inlet hydrogen, indicating the lower…
Read the paper
Related studies
- eggNOG 5.0: a hierarchical, functionally and phylogenetically annotated orthology resource based on 5090 organisms and 2502 viruses
- Online Survival Analysis Software to Assess the Prognostic Value of Biomarkers Using Transcriptomic Data in Non-Small-Cell Lung Cancer
- OptiType: precision HLA typing from next-generation sequencing data
- Nicotinic Cholinergic System and COVID-19: In Silico Identification of an Interaction between SARS-CoV-2 and Nicotinic Receptors with Potential Therapeutic Targeting Implications
- Saccharomyces cerevisiae cells have three Omega class glutathione S-transferases acting as 1-Cys thiol transferases
- Hemolysis at low blood flow rates: in-vitro and in-silico evaluation of a centrifugal blood pump
Go deeper in Evidence Hub
Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.