代理柴油重整实验及动力学模型研究

发布时间：2018-06-13 01:13

本文选题：废气柴油重整制氢 + CHEMKIN　；参考：《合肥工业大学》2016年硕士论文

【摘要】：柴油机因具有发动机寿命长使用维护成本低、燃油经济性好、温室气体及碳氢排放低等优势,近年来得到汽车制造企业和用户的青睐,然而微粒和NOx是其主要污染物,通过研究和对比柴油机机内和机外净化措施得出,废气柴油重整产生的氢气对改善柴油机效率,降低NOX和烟度排放、提高后处理SCR系统催化剂活性和DPF再生至关重要。本文介绍了国内外关于废气柴油重整的研究内容,主要从重整制氢实验和化学动力学研究两方面进行阐述。在仿真模拟方面建立两种反应器模型：流动管模型和蜂窝陶瓷模型,分别模拟没有催化剂和有催化剂参与的条件下的重整情况。并在化学动力学理论基础上对这两种模型分别进行了介绍。由于柴油成分的复杂性国内外普遍采用代理组分来模拟柴油成分,本文首先介绍了常用的代理组分机理及它们在仿真模拟中的应用,阐述了机理的选用原则,最终确定了本文仿真模拟所采用的两种代理柴油气相动力学机理,建立了CHEMKIN模拟模型。对重整过程产生影响的因素很多,本文主要从空速、模型入口温度、氧碳比和水碳比四个方面阐述对重整过程的影响,通过两种模型、两种机理模拟结果的对比得出一系列最宜重整条件。模拟完成后,对反应物和产物进行了敏感性分析和生成速率分析找出了对反应影响较大的机理文件中的基元反应及反应物／生成物的消耗/生成路径。重整模拟完成后,参考国外重整实验数据对仿真模拟结果进行验证,对比结果显示本文所建模型可靠性和准确性强,对今后的实验研究有一定的指导意义和参考价值,在机理选用上有一定的优化空间。
[Abstract]:Diesel engine has the advantages of low maintenance cost, good fuel economy, low greenhouse gas and low carbon and hydrogen emissions, etc. In recent years, diesel engine has been favored by automobile manufacturers and customers. However, particulates and NOx are the main pollutants of diesel engine. Through the study and comparison of the internal and external purifying measures of diesel engine, it is found that the hydrogen produced by diesel engine reforming is very important to improve the efficiency of diesel engine, reduce the emission of no _ x and smoke, increase the activity of catalyst and regeneration of DPF in the post-treatment SCR system. This paper introduces the research contents of diesel reforming of exhaust gas at home and abroad, mainly from two aspects: reforming hydrogen production experiment and chemical kinetics research. In the aspect of simulation, two kinds of reactor models, flow tube model and honeycomb ceramic model, were established to simulate the reforming conditions without and with catalyst respectively. The two models are introduced based on the theory of chemical kinetics. Because of the complexity of diesel components, agent components are widely used to simulate diesel components at home and abroad. Firstly, the mechanism of agent components and their application in simulation are introduced in this paper, and the selection principle of mechanism is expounded. Finally, two kinds of agent diesel gas dynamics mechanism are determined, and the CHEMKIN simulation model is established. There are many factors that influence the reforming process. This paper mainly discusses the influence on the reforming process from four aspects: space velocity, model inlet temperature, oxygen / carbon ratio and water / carbon ratio. A series of optimum reforming conditions were obtained by comparing the simulation results of the two mechanisms. After the simulation was completed, sensitivity analysis and generation rate analysis of reactants and products were carried out to find out the elementary reactions and the consumption / generation paths of reactants / products in the mechanism file which had a great influence on the reaction. After the reforming simulation is completed, the simulation results are verified by referring to the foreign reforming experimental data. The comparison results show that the model built in this paper has strong reliability and accuracy, which has certain guiding significance and reference value for the future experimental research. There is a certain space for optimization in the selection of mechanism.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK421

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