Real-Time Simulation of CNG Engine and After-Treatment System Cold Start. Part 2: Tail-Pipe Emissions Prediction Using a Detailed Chemistry Based MOC Model

Author:

Leon de Syniawa Larisa,Siddareddy Reddy Babu,Oder Johannes,Franken Tim,Guenther Vivien,Rottengruber Hermann,Mauss Fabian

Abstract

<div class="section abstract"><div class="htmlview paragraph">In contrast to the currently primarily used liquid fuels (diesel and gasoline), methane (CH<sub>4</sub>) as a fuel offers a high potential for a significant reduction of greenhouse gas emissions (GHG). This advantage can only be used if tailpipe CH<sub>4</sub> emissions are reduced to a minimum, since the GHG impact of CH<sub>4</sub> in the atmosphere is higher than that of carbon dioxide (CO<sub>2</sub>). Three-way catalysts (TWC - stoichiometric combustion) and methane oxidation catalysts (MOC - lean combustion) can be used for post-engine CH<sub>4</sub> oxidation. Both technologies allow for a nearly complete CH<sub>4</sub> conversion to CO<sub>2</sub> and water at sufficiently high exhaust temperatures (above the light-off temperature of the catalysts). However, CH<sub>4</sub> combustion is facing a huge challenge with the planned introduction of Euro VII emissions standard, where stricter CH<sub>4</sub> emission limits and a decrease of the cold start starting temperatures are discussed.</div><div class="htmlview paragraph">The aim of the present study is to develop a reliable kinetic catalyst model for MOC conversion prediction in order to optimize the catalyst design in function of engine operation conditions, by combining the outputs from the predicted transient engine simulations as inputs to the catalyst model. Model development and training has been performed using experimental engine test bench data at stoichiometric conditions as well as engine simulation data and is able to reliably predict the major emissions under a broad range of operating conditions. Cold start (-7°C and +20°C) experiments were performed for a simplified worldwide light vehicle test procedure (WLTP) driving cycle using a prototype gas engine together with a MOC. For the catalyst simulations, a 1-D catalytic converter model was used. The model includes detailed gas and surface chemistry that are computed together with catalyst heat up. In a further step, a virtual transient engine cold start cycle is combined with the MOC model to predict tail-pipe emissions at transient operating conditions. This method allows to perform detailed emission investigations in an early stage of engine prototype development.</div></div>

Publisher

SAE International

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3