Full-spectrum k-distribution weighted sum of gray gases model for air and oxyfuel combustion of hydrogen-hydrocarbon blends at atmospheric pressure

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-03-21 DOI:10.1016/j.tsep.2025.103514

Johannes Losacker, Alex M. Garcia, Nico Schmitz, Christian Wuppermann

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引用次数: 0

Abstract

In the context of decarbonization of heating processes, alternative fuels as hydrogen, ammonia, or biogas are explored to substitute conventional fuels as natural gas. The altered flue gas compositions from such flames demand flexible modeling of radiative properties of the participating gases H₂O and CO₂. Various Weighted Sum of Gray Gases (WSGG) model formulations and coefficients have been proposed in the literature, but few cover all conditions that result from the combustion of any blend of the aforementioned fuels. In this work, two sets of coefficients for a WSGG model with 5 gray gases are calibrated for air and oxyfuel combustion conditions at atmospheric pressure, to improve on the accuracy and flexibility of existing models. Weights and absorption coefficients are derived from k-distributions based on line-by-line integrations using the HITEMP 2010 spectroscopic database. Base functions are fitted to continuously recover the weights and absorption coefficients within the range of calibration. The new model covers H₂O to CO₂ molar ratios of

1 \leq M r \leq \infty

, and temperatures in the range of

300 K \leq T \leq 2700 K

for air combustion, and

300 K \leq T \leq 3000 K

for oxyfuel combustion. The models are assessed by predictions of total emissivity as well as radiative heat flux and source term in a 1D slab. Benchmark solutions are obtained from line-by-line integrations covering the compositions of the calibration database. The new model shows significantly improved predictions in comparison to recent WSGG models.

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.