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首页> 外文期刊>American journal of applied sciences >Effects of Gas Velocity and Temperature on Nitric Oxide Conversion in Simulated Catalytic Converter
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Effects of Gas Velocity and Temperature on Nitric Oxide Conversion in Simulated Catalytic Converter

机译：气体流速和温度对模拟催化转化器中一氧化氮转化率的影响

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Problem statement: Gaseous emissions from gasoline engine such as carbon monoxide, unburned hydrocarbon and nitrogen oxides were usually reduced in three-way catalytic converter simultaneously around theoretical fuel and air combustion. Engine speed and load and other parameters were varied over a wide range of operating conditions, resulting in different exhaust gas composition and condition intake into catalytic converter. This work was studied the conversion of Nitric Oxide (NO) in exhaust gas catalytic converter affected by gas velocity and inlet temperature using numerical modeling. Approach: The simulation was based on a one-dimensional time-dependent model within a single monolith channel of the converter. Upon certain assumptions, the study was considered heterogeneous combustion reaction between gas and solid phases based on lumped kinetic reactions. In this study, constants and variables used for mass and heat transfers were dependent on gas or solid phase temperature and mole fraction. Finite difference scheme incorporated with the generated computer code was established for solving species and energy balances within gas and solid phases. Results: The NO conversion was increased with transient period in initial and reached steady state at different values. The lower inlet gas temperature was resulted in lesser NO conversion at the same inlet NO concentration and gas velocity. The light-off temperatures were up to 520 K and a sudden rise in NO conversion was from 550-605 K and decreasing onwards, generating working temperature window. NO conversion increased throughout the catalyst bed from the inlet and the conversion decreased as the gas velocity increased. Conclusion/Recommendations: Gas space velocity and gas temperature intake to the converter affected the NO conversion over the time and the axial distance from the catalyst bed inlet. The numerical results have summarily demonstrated a good approximation compared to experimental data provided in the literature. Further investigation of such effects on other gaseous components is recommended for future work.
机译：问题陈述：在三元催化转化器中，通常在理论燃料和空气燃烧的周围同时减少汽油发动机的气体排放，例如一氧化碳，未燃烧的碳氢化合物和氮氧化物。发动机转速和负载以及其他参数在很宽的工况范围内变化，导致废气成分和进入催化转化器的条件不同。这项工作使用数值模型研究了废气催化转化器中一氧化氮（NO）的转化受气体速度和入口温度的影响。方法：仿真是基于转换器的单个整体通道内的一维时间相关模型。基于某些假设，该研究被认为是基于集总动力学反应的气相和固相之间的异质燃烧反应。在这项研究中，用于传质和传热的常数和变量取决于气相或固相温度和摩尔分数。建立了与生成的计算机代码结合的有限差分方案，用于解决气相和固相中的物质和能量平衡。结果：在初始阶段，NO转化率随过渡期的增加而增加，并在不同的值达到稳态。在相同的入口NO浓度和气体速度下，较低的入口气体温度导致NO转化较少。起燃温度高达520 K，NO转化率突然从550-605 K上升，并逐渐下降，从而产生工作温度窗口。从入口到整个催化剂床，NO转化率增加，并且随着气体速度的增加，转化率降低。结论/建议：转化器的气体空速和气体温度随着时间的推移以及与催化剂床入口的轴向距离影响NO转化率。与文献中提供的实验数据相比，数值结果已证明了很好的近似性。建议进一步研究这种对其他气体成分的影响，以备将来之用。

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