A Comparison of Engine Emissions from Heavy, Medium, and Light Vehicles for CNG, Diesel, and Gasoline Fuels

作者：Yasar Abdullah^*; Haider Rizwan; Tabinda Amtul Bari; Kausar Fidous; Khan Maryam

来源：Polish Journal of Environmental Studies, 2013, 22(4): 1277-1281.

• alternative fuels
• vehicular emissions
• diesel vehicles
• air quality
• fuel and engine types

Like other developing countries (Brazil, Argentina, and India) compressed natural gas (CNG) is becoming a popular vehicular fuel in Pakistan. Rapid shifting of diesel and gasoline vehicles to CNG has brought Pakistan the highest number of CNG vehicles in the world. To quantify a possible decrease in vehicular emissions for different types of vehicles, engine and fuel types were monitored for five parameters: SO2, CO, NO, hydrocarbons, and smoke opacity. Emissions from heavy vehicle engines shifting from diesel to CNG showed a decrease in HC (14 times), NO (2.8 times), and smoke opacity (3.2 times), while shifting diesel car engines to CNG resulted in reduced emissions of HC (24.6 times), NO (2.8 times), and smoke opacity (6 times). However, switching of light vehicles such as gasoline car engines to CNG released low emissions of HC (4.6 times), smoke opacity (1.2 times), SO2 (1.2 times), and CO (1.1 times), but an increase in NO (1.2 times) was observed. Similarly, a 4-stroke CNG rickshaw engine increased NO emissions by 1.4 times over a 4-stroke gasoline rickshaw engine.

• 出版日期2013