Homogenous gas-phase reactions in exhaust-gas tail pipes of internal combustion engines

内燃机废气尾管中的均相气相反应

• 批准号: 391765816
• 负责人: Professor Dr. Olaf Deutschmann
• 金额: --
• 依托单位: National Natural Science Foundation of China
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/391765816?language=en
• 关键词: Homogenous; gas; phase; reactions; exhaust

Increasing demands on the control of pollutant emissions such as NOx from internal combustion engines, the use of fuels with decreased climate impact, and the development of more efficient engines call for alternate after-treatment strategies such as positioning of catalytic converters closer to the engine. The resulting higher temperature and pressure bear the potential for significant gas-phase reactions in the tailpipe effecting the emission reduction. For instance, in a selective catalytic reduction (SCR) system, the molar ratio of NOx and NH3 could be changed by gas-phase reactions leading to increased NOx emission. Homogeneous reactions among the exhaust gas components, HC/HCO/CO/NOx/O2/NH3/H2O/CO2/N2, have barely been investigated and are far from being understood at tail-pipe conditions. The present joint Sino-German project will study gas-phase reactions for those conditions in the presence of a NH3-SCR system at lean operating conditions. Gas-phase reactions in the raw gases in the engine-near tailpipe and in emission control devices will be characterized, understood, and modelled through studies in the homogeneous gas-phase and in the open channels of catalytic honeycomb structures. The scientific aim is to provide a fundamental understanding of gas-phase reactions that will occur in these raw gases. Only such a fundamental understanding will allow the characterization of exactly those reactive mixtures that indeed reach the catalyst and thus to develop realistic chemical models, and to optimize fuel-engine-associated aftertreatment systems towards reduced emissions with decreased toxicity and chemically less hazardous signature. To achieve these goals, the project will make use of the combined, complementary, and often unique expertise of the partners regarding combustion chemistry diagnostics, kinetic analyses, and model development relevant to oxidation and combustion, and aftertreatment strategies. The project will consider (i) fuel diversity reaching from conventional gasoline and Diesel to current biofuels and to future electrically-derived fuels, (ii) variable engine operation conditions, and (iii) operation of the catalytic converter closer to the engine. This vast combination of conditions is a reason for the current lack of fundamental understanding of gas-phase reactions in the near-engine raw gases. It is thus of utmost importance to identify common, prototypical compositions and variables, including mixture components and temperature as well as potentially pressure sensitivity.This collaboration addresses acute challenges that will also have an impact on air quality issues in China and Germany. The project will build upon and expand an already well-established partnership between German and Chinese groups.

对控制污染物排放的需求的增加，例如内燃机NOX，使用具有降低气候影响的燃料以及更有效的发动机的开发要求采取替代的后处理策略，例如将催化转化器定位到更靠近发动机的情况下。所得的较高温度和压力具有导致减少排放的尾管中显着气相反应的潜力。例如，在选择性催化还原（SCR）系统中，NOX和NH3的摩尔比可以通过导致NOX发射增加的气相反应来改变。几乎没有研究排气组件之间的均匀反应，HC/HCO/CO/CO/NOX/NH3/H2O/CO2/N2几乎没有研究过，并且在尾流条件下远未被理解。 目前的中华 - 德国联合项目将在精益工作条件下在NH3-SCR系统的情况下研究这些条件的气相反应。通过在均匀气相和催化蜂窝结构的开放通道中的研究来表征，理解和建模，发动机 - 尾管和发射控制装置中的原始气体中的气相反应将被表征，理解和建模。科学的目的是提供对这些原始气体中会发生的气相反应的基本理解。只有这样的基本理解才能使那些确实达到催化剂并因此开发现实化学模型的反应性混合物的表征，并优化与燃料引擎相关的后处理系统，以减少毒性降低和化学上危险性降低的发射。为了实现这些目标，该项目将利用合作伙伴在燃烧化学诊断，动力学分析以及与氧化和燃烧以及后处理策略有关的合作，互补且通常是独特的专业知识。该项目将考虑（i）从常规汽油和柴油到当前生物燃料的燃料多样性，再到未来的电燃料，（ii）可变发动机操作条件，以及（iii）催化转换器的运行，靠近发动机。这种巨大的条件组合是目前缺乏对近引擎原始气体中气相反应的基本了解的原因。因此，确定常见的原型组成和变量，包括混合物成分和温度以及潜在的压力敏感性至关重要。这项协作解决了急性挑战，这也将对中国和德国的空气质量问题产生影响。该项目将在德国和中国团体之间建立并扩大已经建立的良好合作伙伴关系。

项目成果

Inhibiting and promoting effects of NO on dimethyl ether and dimethoxymethane oxidation in a plug-flow reactor

• DOI: 10.1016/j.combustflame.2020.08.027
• 发表时间: 2020-09
• 期刊: Combustion and Flame
• 影响因子: 4.4
• 作者: Hao Zhang;Steffen Schmitt;L. Ruwe;K. Kohse-Höinghaus

Exploring the interaction kinetics of butene isomers and NO$_{x}$ at low temperatures and diluted conditions

• DOI: 10.1016/j.combustflame.2021.111557
• 发表时间: 2021-11
• 期刊: Combustion and Flame
• 影响因子: 4.4
• 作者: Sabrina Gossler;L. Ruwe;Wenhao Yuan;Jiuzhong Yang;Xiamin Chen;Steffen Schmitt;L. Maier;K. Kohse-Höing

Insights into the interaction kinetics between propene and NOx at moderate temperatures with experimental and modeling methods

• DOI: 10.1016/j.proci.2020.07.041
• 发表时间: 2020-09
• 作者: Wenhao Yuan;L. Ruwe;S. Schwarz;Chuangchuang Cao;Jiuzhong Yang;O. Deutschmann;K. Kohse-Höinghaus