The Effect of Pressure on Hydrocarbon Oxidation Through the Negative Temperature Coefficient Regime

负温度系数条件下压力对烃氧化的影响

• 批准号: 9213901
• 负责人: Nicholas Cernansky
• 金额: $ 23.57万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-12-01 至 1996-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9213901&HistoricalAwards=false
• 关键词: Effect; Pressure; Hydrocarbon; Oxidation; Through

This program (an extension of a current NSF program) is directed to the study of effects of pressure on hydrocarbon oxidation in low and intermediate (550-1000K) temperature regimes, with acquisition of kinetic information at pressures up to 20 atmospheres for oxidation of pure hydrocarbons containing four or more carbon atoms. A major part of the work will utilize a recently-developed pressurized flow reactor test facility. The experiments to be conducted will provide resolution of mechanistic details (and the effects of pressure on these) associated with alkylperoxy radical reactions and definition of the role of diperoxy radicals as branching agents. Other separate complementary bench-scale experiments will also be utilized to elucidate mechanistic details controlling the oxidation of straight and branched hydrocarbons in the low and intermediate temperature regimes. Gas chromatography, GC/MS, and GC/FTIR diagnostics will be used for chemical analysis of stable reaction intermediates and products, while in-situ measurements of stable and radical species will be carried out using FTIR spectroscopy. Specific objectives are: (1) Obtain kinetic information for oxidation of pure hydrocarbons between 550 and 1000K at pressures up to 20 atmospheres; (2) Determine effects of pressure on oxidation mechanism(s) in each temperature regime and how pressure affects boundaries separating the regimes; and, (3) Suggest and refine mechanisms for modeling the alkylperoxy radical reaction system and the diperoxy radical reaction system. Hydrocarbon oxidation chemistry at low to intermediate temperatures (below 1000K) plays a significant role in operation of many combustion devices, notably internal combustion engines, in some cases accounting for a significant fraction of the overall heat release as well as strongly affecting input boundary conditions for the higher temperature regions in these devices. Since such devices operate at elevated pressures, fundamental research on low and intermediate temperature hydrocarbon oxidation at pressures well above atmospheric is important to furthering the understanding of many practical internal combustion engine phenomena, including engine knock, preignition fuel decomposition, pollutant formation, and general autoignition processes.

该计划（当前NSF计划的扩展）是 涉及压力对烃的影响的研究 氧化 低温和中温（550 - 1000K）， 在高达20的压力下获取动力学信息 氧化纯烃的气氛， 或更多的碳原子。 这项工作的主要部分将利用 最近开发的压流反应堆试验设备。 的 将进行的实验将提供分辨率 机械细节（以及压力对这些细节的影响） 与烷基过氧自由基反应有关的定义 的 双过氧自由基作为支化剂的作用。 其他 还将进行单独的补充实验室规模的实验， 用来阐明控制的机械细节 直链和支链烃的氧化， 中间温度状态。 气相色谱法，GC/MS， 和GC/FTIR诊断将用于化学分析， 稳定的反应中间体和产物，而在原位 将对稳定和自由基物种进行测量 使用FTIR光谱法。 具体目标是：（1） 纯烃氧化反应动力学信息 550和1000K，压力高达20个大气压;（2）确定 压力对氧化机制的影响 温度状态和压力如何影响边界 （3）建议和完善机制 用于模拟烷基过氧自由基反应体系和 双过氧自由基反应体系 在低到中等温度下的烃氧化化学 温度（低于1000K）在 许多燃烧装置的操作，特别是内燃机的操作， 内燃机，在某些情况下， 的零头 总热量释放以及强烈影响输入 中较高温度区域的边界条件 这些 装置. 由于此类装置在高压下运行， 中低温基础研究 在远高于大气压的压力下的烃氧化， 重要的是要进一步了解许多实际的 内燃机现象，包括发动机爆震， 预燃燃料分解，污染物形成，以及 一般自燃过程。