ポリオキシメチレンジメチルエーテルを動力源とする大型エンジンでの後処理システム加熱用のディーゼル酸化触媒への燃料投与
Fuel Dosing on a Diesel Oxidation Catalyst for After-Treatment System Heating on a Heavy-Duty Engine Powered by Polyoxymethylene Dimethyl Ethers
- 提供方法
- 版元よりダウンロードリンクを連絡
- 形態
- 価格
- 一般価格(税込)：￥6,600 会員価格(税込)：￥5,280
- 文献番号
- 20201987
- 文献・情報種別
- SAE Paper
No.2020-01-2157
- 掲載ページ
- 1-12(Total 12 p)
- 発行年月
- 2020年 9月
- 出版社
- SAE International
- 言語
- 英語
書誌事項
| 著者（英） | 1) Alexander D. Gelner, 2) Christian Pastoetter, 3) Harald A. Beck, 4) Martin Härtl, 5) Georg Wachtmeister |
|---|---|
| 勤務先（英） | 1) Technical University of Munich, 2) MAN Truck and Bus SE, 3) MAN Truck and Bus SE, 4) Technical University of Munich, 5) Technical University of Munich |
| 抄録 | ポリオキシメチレンジメチルエーテル(OME)運転でのメタンやホルムアルデヒドの排出を避けるには，EGRと選択的触媒還元(SCR)による排気後処理を合わせた希薄混合気が有用である．SCRシステムの尿素投与には加熱対策が必要で，電気加熱に加え，発熱反応のためのディーゼル酸化触媒への燃料噴射は触媒の条件を迅速に達成する効果的な方法である． |
| 抄録（英） | Polyoxymethylene dimethyl ethers (OME) are synthetic fuels, which offer the property of sustainability because the reactants of production base on hydrogen and carbon dioxide on the one hand, and the air pollution control in consequence of a soot-free combustion in a diesel engine on the other hand. High exhaust gas recirculation (EGR) rates are a promising measure for nitrogen oxide (NOx) reduction without increasing particle emissions because of the resolved soot-NOx trade-off. However, EGR rates towards stoichiometric combustion in OME operation reveals other trade-offs such as methane and formaldehyde emissions. To avoid these, a lean mixture with a combination of EGR and exhaust after-treatment with selective catalytic reduction (SCR) is useful. The limitation of urea dosing due to the light-off temperature of SCR systems requires heating measures. Besides electrical heating, fuel injection into the diesel oxidation catalyst (DOC) for an exothermic reaction is an effective method for a quick achievement of the catalyst working conditions. A slip of unburned or partially oxidized hydrocarbons (HC) in fossil diesel operation restricts this measure. Conducted investigations of a heavy-duty engine showed a reciprocal proportionality in OME operation between injection quantity and unburned fuel fragment slip over the DOC. Additionally, the NO oxidation increases with rising post injection quantities, whereas fuel dosing in diesel operation shows the opposite effect. These behaviors during OME operation enable potentials for further NOx reduction in tailpipe emissions because of earlier urea dosing in SCR systems in addition to lower raw emission levels caused by high EGR rates. 翻訳 |
