• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>SAE International Powertrains, Fuels Lubricants Meeting >Feasibility Study of Exhaust Emissions in a Natural Gas Diesel Dual Fuel (DDF) Engine
【24h】

Feasibility Study of Exhaust Emissions in a Natural Gas Diesel Dual Fuel (DDF) Engine

机译：天然气柴油机双燃料（DDF）发动机排放排放的可行性研究

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Diesel Dual Fuel (DDF) vehicle is one of the technologies to convert diesel vehicles for natural gas usage. The purpose of this research was to study the possibility of a DDF vehicle to meet emission standards for diesel vehicles. This research was done for small passenger vehicles and commercial vehicles. The exhaust emissions compliance of such vehicles in a New European Driving Cycle (NEDC) mode which was composed of Urban Driving Cycles (UDC) and an Extra Urban Driving Cycle (EUDC) was evaluated. (see APPENDIX Figure A1) In this study, the passenger vehicle engine, compliant with the EURO4 standard, was converted to a DDF engine. Engine bench tests under steady state conditions showed similar result to previous papers. Total hydrocarbon (HC) emission was extremely high, compared to diesel engine. The NEDC mode emissions of the DDF vehicle were estimated based on these engine bench test results. The results indicate that the HC + nitrogen oxides (NO_x) emission of the DDF is approximately six times higher than the EURO4 regulation and it doesn't meet the EURO4 standard due to the high HC emission. Then, combustion was improved to reduce HC emission. By increasing the air-fuel mixture temperature and intake airflow, HC emission was improved by 45% However, HC emission must be reduced by 83% or more in order to meet the EURO4 HC+NO_x emission standard, so the reduction by combustion improvement is still insufficient. It was concluded that further significant reduction through combustion improvements would be difficult, and other methods for meeting the EURO4 regulations were studied. Narrowing DDF area, operating with diesel fuel only in low load condition where large amount of HC emission emitted, was evaluated although it reduces Natural Gas (NG) usage. As a result, the NG fuel usage rate in NEDC mode was approximately 20%, and alternating diesel fuel to NG fuel was limited. However, limiting the DDF operation area may be effective for suburban driving that often uses the high-load condition and in long-distance transport trucks. Although a less thermal efficiency was expected, a stoichiometric combustion with a three-way catalyst to reduce HC emission in the DDF engine was investigated. The simulated mode emissions showed potential to meet the EURO4 standards with this method. Although the diesel-fuel-equivalent fuel consumption (FC) of DDF worsened as expected and increased by approximately 13% over the fuel consumption during diesel fuel use, an HC emission reduction and an NG fuel usage rate of at least 50% were achieved. Therefore, DDF engine stoichiometric combustion with a three-way catalyst seems to be an effective technology in countries where the price of NG fuel is inexpensive.
机译：柴油双燃料（DDF）车辆是将柴油车辆用于天然气使用的技术之一。本研究的目的是研究DDF车辆以满足柴油车辆排放标准的可能性。这项研究是针对小型乘用车和商用车辆进行的。评估了由城市驾驶循环（UDC）组成的新欧洲驾驶周期（NEDC）模式和额外的城市驾驶周期（EUDC）中这些车辆的废气排放符合。 （见附录图A1）在本研究中，符合EURO4标准的乘用车发动机被转换为DDF发动机。发动机台阶测试在稳态条件下显示出与之前的纸张类似的结果。与柴油发动机相比，总烃（HC）发射极高。基于这些发动机板凳测试结果估计DDF车辆的NEDC模式排放。结果表明，DDF的HC +氮氧化物（NO_X）排放量大约比EURO4调节高约六倍，由于HC排放高，它不会达到EURO4标准。然后，改善燃烧以减少HC发射。通过增加空气 - 燃料混合物温度和进气气流，HC排放得到45％，但必须减少83％以上的HC排放，以满足欧元4欧元+ NO_X排放标准，因此通过燃烧改善的减少是仍然不足。得出结论，通过燃烧改善进一步显着降低是困难的，研究了其他满足欧元4欧元法规的方法。缩小DDF区域，仅在低负荷条件下使用柴油燃料，虽然它减少了天然气（NG）使用量，但是评估了大量的HC发射。结果，NEDC模式中的NG燃料使用率约为20％，并且将柴油燃料交替燃料是有限的。然而，限制DDF操作区域对于郊区驾驶可能是有效的，这些驾驶通常使用高负载条件和长途传输卡车。虽然预期了较少的热效率，但研究了具有三元催化剂以减少DDF发动机中HC发射的化学计量燃烧。模拟模式排放显示出符合此方法满足EURO4标准的潜力。虽然DDF的柴油燃料等效燃料消耗（FC）随着预期恶化并且在柴油使用期间燃料消耗增加了大约13％，但达到了HC排放减排和NG燃料使用率至少为50％。因此，具有三元催化剂的DDF发动机化学计量燃烧似乎是NG燃料价格廉价的国家的有效技术。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号