Influence of hydrogen and oxygen on the initial steps of soot formation

氢和氧对烟灰形成初始阶段的影响

• 批准号: 275255277
• 负责人: Professor Dr. Christof Schulz
• 金额: --
• 依托单位: Institut für Energie- und Material-Prozesse (EMPI)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/275255277?language=en
• 关键词: Influence; hydrogen; oxygen; initial; steps

Carbon nanoparticles play an important role as combustion-generated pollutants as well as important industrial products. The understanding and modeling of their formation pathways, therefore, is of high interest. In particular, hydrogen and oxygen play an important role inthe underlying reactions. Systematic studies on the mechanistic details, however, are scarce. Therefore, the influence of molecular and bonded hydrogen as well as the influence of molecular Oxygen was as well as oxygenate additives on particle induction times, particle formation rates, particle volume fractions, particle morphology, as well as on reaction channels leading to soot will be studied using a close interaction of experiments under a wide range of reactionsconditions and modeling. The proposed project systematically extends thematically and methodically the work carried out in the first project period and builds on the experimental capabilities developed and demonstrated in the first period. As precursor systems, ethylene,acetylene, and benzene (with and without the addition of the oxygenates methanol, n-butanol and furans) will be studied as representative hydrocarbon classes with variable C/H ratios underpyrolytic and mildly oxidative conditions. Studies have shown that oxygenated fuels and the admixture of oxygenated fuel components leads to a reduction of the soot volume fraction and an increase in the production of smaller particles. At flame conditions, molecular andbonded oxygen can influence soot formation by increasing radical concentrations and initial heat release or by oxidation reactions of soot precursors and soot particles compared to pyrolysis conditions. Therefore, soot formation with and without additives will be studied byusing complementary techniques such as shock tubes (pyrolytic and oxidative), a burnt-gas flow reactor (pyrolytic) and a McKenna burner (oxidative) that cover studies under a wide range of reaction conditions. Through these combined approaches, all stages of soot formation can be investigated: shock tubes coupled with in situ, online, and offline techniques provide well-defined reaction conditions where the gas-phase composition and soot volume fractions andparticle sizes can be determined with ultra-high time resolution. The burnt-gas flow and McKenna reactors enable the investigation of processes on longer reaction times and provide good sampling possibilities throughout the different steps of the soot formation. Allmeasurements will be related to theoretical studies and modeling. This project is based on a close collaboration between a German and a Russian research group. The latter will apply for additional funding from the Russian side.

碳纳米颗粒作为燃烧生成的污染物以及重要的工业产品起重要作用。因此，对其形成途径的理解和建模具有很高的关注。特别是，氢和氧在潜在反应中起重要作用。但是，对机械细节的系统研究很少。因此，分子和键合氢以及分子氧的影响以及氧合添加剂对颗粒诱导时间，颗粒形成速率，颗粒体积分数，颗粒形态，颗粒形态以及导致烟灰的反应通道的影响以及在广泛的反应范围内的紧密相互作用。拟议的项目在第一个项目期间系统地和有条不紊地进行了系统地和有条不紊的工作，并建立在第一个时期开发和证明的实验能力的基础上。作为前体系统，将研究乙烯，乙炔和苯（有和不添加氧化甲醇，N-丁醇和呋喃）作为代表性的碳氢化合物类别，具有可变的C/H比具有可变的C/H比含量下的碳水化合物和轻度氧化条件。研究表明，含氧燃料和含氧燃料成分的混合会导致烟灰体积分数的减少和较小颗粒的产生增加。在火焰条件下，与热解条件相比，分子氧和氧的氧气可以通过增加自由基浓度和初始热量释放或烟灰前体和烟灰颗粒的氧化反应来影响烟灰的形成。因此，通过使用互补技术，例如冲击管（热解和氧化），燃烧气体流动反应器（热解）和麦肯纳燃烧器（氧化），将研究带有和没有添加剂的烟灰形成，这些技术涵盖了在广泛的反应条件下的研究。通过这些合并的方法，可以研究烟灰形成的所有阶段：与原位，在线和离线技术相结合的冲击管提供了明确定义的反应条件，在这些反应条件下，可以通过超高的时间分辨率确定气相组合物和烟灰体积分数和植物量的尺寸。燃烧的气流和麦肯纳反应堆可以在较长的反应时间上研究过程，并在烟灰形成的各个步骤中提供良好的采样可能性。 Allmeasurets将与理论研究和建模有关。该项目基于德国与俄罗斯研究小组之间的密切合作。后者将从俄罗斯方面申请额外的资金。