Comparative chemiluminescence investigation of OH* radicals in laminar and turbulent multi-fuel air- and oxy-fuel flames on semi-industrial and laboratory scale including NOX-formation

IF 7.7 2区工程技术 Q1 CHEMISTRY, APPLIED

Fuel Processing Technology Pub Date : 2025-09-26 DOI:10.1016/j.fuproc.2025.108342

Stefan Schwarz , Georg Daurer , Joshua Slawatycki , Matthias Urban , René Prieler , Christian Gaber , Martin Demuth , Christoph Hochenauer

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引用次数: 0

Abstract

Chemiluminescence emitted by the de-excitation of excited hydroxyl radicals (OH*), allows for several insights into combustion processes. The presented study investigates air- and oxy-fuel combustion of natural gas with hydrogen enrichment up to 100%, using both small-scale laminar flames and turbulent high-impulse flames (50–100 kW). The obtained results from the laminar 1 kW flames from the laboratory burner are then used, to interpret the influence of turbulence and chemistry influence from an industrial scale multi-fuel multi-oxidizer burner. The measurements performed for the laboratory burner were also compared to simulations. Experimental data were compared to 1D simulations, showing good agreement in trends. However, in turbulent flames, turbulence effects far exceeded those of combustion chemistry. While laminar flames exhibited the highest chemiluminescence intensity in CH₄-air combustion in both experiments and simulations, the maximum in turbulent combustion experiments occurred in oxy-fuel combustion, with hydrogen and natural gas performing similarly. Oxy-fuel flames showed similar chemiluminescence intensities, increased by 2 orders of magnitude, compared to turbulent air-fuel combustion. Additionally, the changes in flame shape and reaction zone size for hydrogen-enrichment in air-fuel combustion were investigated in terms of NO_X formation, where OH* imaging proved its potential for emission reduction.

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层流和湍流多燃料空气和全氧燃料火焰中OH*自由基在半工业和实验室规模下的化学发光对比研究，包括nox的形成

化学发光发射激发羟基自由基（OH*）的去激发，允许几个洞察燃烧过程。本研究利用小型层流火焰和湍流高冲量火焰（50-100千瓦），研究了富氢率高达100%的天然气在空气和氧气燃料下的燃烧。然后使用实验室燃烧器层流1 kW火焰获得的结果来解释工业规模多燃料多氧化剂燃烧器的湍流影响和化学影响。对实验室燃烧器进行的测量也与模拟进行了比较。将实验数据与一维模拟数据进行了比较，结果表明趋势一致。然而，在湍流火焰中，湍流效应远远超过了燃烧化学效应。在实验和模拟中，层流火焰在ch4 -空气燃烧中表现出最高的化学发光强度，而在湍流燃烧实验中，最大的化学发光强度出现在氧燃料燃烧中，氢气和天然气的化学发光强度相似。与湍流空气燃料燃烧相比，全氧燃料火焰表现出相似的化学发光强度，提高了2个数量级。此外，从NOX形成的角度研究了空气燃料燃烧中富氢火焰形状和反应区大小的变化，其中OH*成像证明了其减少排放的潜力。

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来源期刊

Fuel Processing Technology 工程技术-工程：化工

CiteScore

13.20

自引率

9.30%

发文量

398

审稿时长

26 days

期刊介绍： Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.