Chemical kinetics of Lean − Rich − Lean fuel-air staged NH3/H2-air combustion for emission control

IF 6.7 1区 工程技术 Q2 ENERGY & FUELS Fuel Pub Date : 2024-11-26 DOI:10.1016/j.fuel.2024.133813
Y. Vijrumbana , M. Srinivasarao , Ekenechukwu C. Okafor , Binod Raj Giri , V. Mahendra Reddy
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Abstract

Ammonia has garnered considerable attention among researchers as a carbon–neutral fuel option. Addressing the challenge of its inherently slow combustion kinetics, significant research efforts have been directed toward mitigating NOx emissions, which represents a critical hurdle in advancing the commercial viability of ammonia as a sustainable fuel. The rich-lean combustion approach has been advocated and demonstrated as the primary means to keep NOX within acceptable emission limits. However, in the current study, a distributed fuel and air injection strategy is proposed and investigated as a superior alternative compared to the traditional rich-lean method for NOX reduction for NH3/H2-air mixtures with higher ammonia fuel fraction (XNH3 = 50 − 90 %). The proposed lean-rich-lean strategy with multi-staging of fuel and air supply is achieved by injecting NH3-air mixtures into H2-air combustion products followed by a downstream supply of preheated dilution air. Such an injection strategy manages the surge of NHi and O/H radicals while avoiding local temperature peaks by implementing a two-stage ignition pattern of NH3/H2 blends combustion in series. NOX reductions of approximately 48 % and 7 % forXNH3 = 50 % and 70 %, respectively, is achieved with the lean-rich-lean combustion strategy compared to the rich-lean strategy over a wide range of global equivalence ratios(ϕG = 0.3 to 0.7). The lean-rich-lean combustion strategy for atmospheric NH3/H2-air swirl flames, when integrated with advanced SCR technology, is anticipated to demonstrate a viable approach to achieving zero carbon and low NOX emissions in industrial applications.
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用于排放控制的稀-富-稀燃料-空气分段NH3/H2-空气燃烧的化学动力学
氨作为一种碳中和燃料,已经引起了研究人员的极大关注。为了应对氨固有的缓慢燃烧动力学所带来的挑战,大量研究工作都集中在减少氮氧化物的排放上,而氮氧化物的排放是氨作为一种可持续燃料在商业上取得成功的关键因素。富余燃烧方法已被提倡并证明是将氮氧化物排放控制在可接受范围内的主要手段。然而,在当前的研究中,我们提出并研究了一种分布式燃料和空气喷射策略,与传统的富余-贫乏燃烧法相比,该策略在氨燃料组分较高(XNH3 = 50 - 90 %)的 NH3/H2- 空气混合物中减少氮氧化物方面更胜一筹。所提出的多级燃料和空气供应的贫-富-贫策略是通过将 NH3-空气混合物注入 H2- 空气燃烧产物,然后再向下游供应预热稀释空气来实现的。这种喷射策略可控制 NHi 和 O/H 自由基的激增,同时通过实施 NH3/H2 混合物串联燃烧的两级点火模式,避免出现局部温度峰值。在全局当量比(jG = 0.3 至 0.7)范围内,当 XNH3 = 50 % 和 70 % 时,采用贫-富-贫燃烧策略比采用富-贫燃烧策略分别减少了约 48 % 和 7 % 的 NOX。大气中 NH3/H2- 空气漩涡火焰的贫-富-贫燃烧策略与先进的选择性催化还原技术相结合,预计将展示一种在工业应用中实现零碳和低氮氧化物排放的可行方法。
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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