Mass estimation of CO2 emissions from diesel vehicles in Taiwan

• Main Authors: LeJun-Yi, 李俊毅
• Other Authors: Sheng-kun Chen
• Format: Others
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/40178587409389173794

碩士 === 崑山科技大學 === 環境工程研究所 === 95 === Recently, due to the increasingly serious global warming issues, every member of the global community gradually starts to pay attention to the warming effect caused by carbon dioxide (CO2). Compared with the effect caused by CO2 emission for various departments locally, transportation departments gradually receive attentive emphasis wherein the possible CO2 emission volume caused by transportation traffic is therefore highly emphasized. However, within the estimation for the CO2 emission volume caused by local vehicle, there have been lots of scientific lectures with vehicle emissions available for reference. However, the CO2 emission caused by diesel vehicle is quite limited. In view of this, this study is compiled with the estimation methods and parameters (emissions and activity strength) for CO2 emission locally and internationally. The estimation for CO2 emission caused by local diesel vehicle (Gg, Gigagram) can be available for the reference of creating management and control strategies. In this article, on the check station for diesel vehicle, there are 50 diesel vehicles (briefed as diesel engines below) with CO2 emissions available for evaluation. The CO2 contents in the emissions of diesel engines are also calculated. By using the Orsat analyzer the relevant factors and emissions of diesel engines are under discussion. Also, the results are compared with local and international (IPCC, GHG Protocol, Australia, USA, Japan and local transportation departments) CO2 emissions and emission to explore the variance. The weighting values for CO2 emission volume caused by various types vehicle and growth rates are explored to analyze the variance. Experiment results indicate, the emission of Brand A is averaged at 399 g CO2/km and Brand B is averaged at 455 g CO2/km. The emissions for vehicle produced within 2001 ~2005 are averaged at 403 g CO2/km; while the emissions for vehicle produced within 1990~1995 are averaged at 504 g CO2/km. Cylinder capacity (briefed as discharge rate c.c. below) for vehicle of 2835~2999 c.c. is averaged at 399 g CO2/km. The emissions for vehicle of discharge rate 3059 c.c. or above are averaged at 458 g CO2/km. Thus, it can be known that vehicle of separately various brands, production years and discharge rate will cause logarithm effect on emissions. Because the emissions for diesel engines produced in various years are different. The arisen CO2 emission volume will be different for vehicle produced in various years. Thus, there are 3 periods 1990 ~1995, 1995 ~2000 and 1995~2005 under discussion. From study results, it is found that the number of diesel engines for past years has increased form 170922 to 181366 number. The driving km number for past years has increased from 2327057 to 5680837 104km. The CO2 emissions decrease from 419 to 403 g CO2/km. Statistical results show that CO2 emission increases from 9744 to 22896 Gg CO2, namely increasing by 1.35 %. Therefore, it can be known that despite lower CO2 emission for newer vehicle, the numbers of both vehicle and driving KM also show larger ratios due to newer vehicle available, finally leading to huge amounts of CO2 emission. By using the averages practically measured through emission (50 engines, 402 g CO2/km) and the driving KM number of various types of diesel engines for past years (1990-2005), CO2 emission for every type of diesel engine can be estimated. Taking 2005 for example, total emission reaches 6417 Gg CO2 with the first 2 emission makers separately on large diesel engines for business (30.8％) and small diesel engines for family use (27.4％). The CO2 emissions of 50 diesel engines are averaged at 2563 g CO2/L. Compared with the CO2 emission difference for local and international diesel engines, the range lies within -6.98~5.74 ％.