Evaluation of exhaust after-treatment device effectiveness in reducing regulated and unregulated emissions from natural gas fueled heavy duty transit bus

2008 ◽  
Author(s):  
Arvind Padmavathy Thiruvengadam
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Gas Fueled ◽  
Unregulated Emissions ◽  
Exhaust After Treatment ◽  
Transit Bus

Development of a Heavy Duty On-Highway Natural Gas-Fueled Engine

1992 ◽  
Author(s):  
Roy Meyer ◽  
David Meyers ◽  
Syed M. Shahed ◽  
Vinod K. Duggal
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Gas Fueled

Transient Emissions from Two Natural Gas-Fueled Heavy-Duty Engines

1993 ◽  
Author(s):  
Christopher A. Sharp ◽  
Terry L. Ullman ◽  
Kenneth R. Stamper
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Gas Fueled ◽  
Transient Emissions

In-Use Emissions from Natural Gas Fueled Heavy-Duty Vehicles

1999 ◽  
Author(s):  
Robert L. McCormick ◽  
Michael S. Graboski ◽  
Teresa Alleman ◽  
Andrew M. Herring ◽  
Paul Nelson
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Gas Fueled ◽  
Heavy Duty Vehicles

Effect of an economical oxidation catalyst formulation on regulated and unregulated pollutants from natural gas fueled heavy duty transit buses

2011 ◽  
Vol 16 (6) ◽  
pp. 469-473 ◽  
Author(s):  
Arvind Thiruvengadam ◽  
Daniel K. Carder ◽  
Mohan Krishnamurthy ◽  
Adewale Oshinuga ◽  
Mridul Gautam
Keyword(s):  
Natural Gas ◽  
Oxidation Catalyst ◽  
Heavy Duty ◽  
Transit Buses ◽  
Gas Fueled

scholarly journals Unregulated Emissions from Natural Gas Taxi Based on IVE Model

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 478
Author(s):  
Hong Zhao ◽  
Liang Mu ◽  
Yan Li ◽  
Junzheng Qiu ◽  
Chuanlong Sun ◽  
...  
Keyword(s):  
Natural Gas ◽  
Total Carbon ◽  
Motor Vehicles ◽  
Pollutant Emission ◽  
Localization Model ◽  
Annual Total ◽  
Hc Emissions ◽  
Analysis System ◽  
Unregulated Emissions ◽  
Ive Model

Emissions from motor vehicles have gained the attention of government agencies. To alleviate air pollution and reduce the petroleum demand from vehicles in China, the policy of “oil to gas” was vigorously carried out. Qingdao began to promote the use of natural gas vehicles (NGVs) in 2003. By the end of 2016, there were 9460 natural gas (NG) taxis in Qingdao, which accounted for 80% of the total taxis. An understanding of policy implementation for emission reductions is required. Experiments to obtain the taxi driving conditions and local parameters were investigated and an international vehicle emissions (IVE) localization model was established. Combined with vehicle mass analysis system (VMAS) experiments, the IVE localization model was amended and included the taxi pollutant emission factors. The result indicates that annual total carbon monoxide (CO) emissions from actual taxis are 6411.87 t, carbureted hydrogen (HC) emissions are 124.85 t, nitrogen oxide (NOx) emissions are 1397.44 t and particulate matter (PM) emissions are 8.9 t. When the taxis are running on pure natural gas, the annual emissions of CO, HC, NOx and PM are 4942.3 t, 48.15 t, 1496.01 t and 5.13 t, respectively. Unregulated emissions of annual total formaldehydes, benzene, acetaldehyde, 1,3-butadience emissions from an actual taxi are 65.99 t, 4.68 t, 1.04 t and 8.83 t. When the taxi is running on pure natural gas, the above unregulated emissions are 12.11 t, 1.27 t, 1.5 t and 0.02 t, respectively.

Experimental Investigation of a Heavy-Duty Compression-Ignition Engine Retrofitted to Natural Gas Spark-Ignition Operation

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Jinlong Liu ◽  
Hemanth Kumar Bommisetty ◽  
Cosmin Emil Dumitrescu
Keyword(s):  
Natural Gas ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Compression Ignition ◽  
Heavy Duty ◽  
Compression Ignition Engine ◽  
Engine Operation ◽  
Cycle Variation ◽  
Spark Timing ◽  
Ci Engines

Heavy-duty compression-ignition (CI) engines converted to natural gas (NG) operation can reduce the dependence on petroleum-based fuels and curtail greenhouse gas emissions. Such an engine was converted to premixed NG spark-ignition (SI) operation through the addition of a gas injector in the intake manifold and of a spark plug in place of the diesel injector. Engine performance and combustion characteristics were investigated at several lean-burn operating conditions that changed fuel composition, spark timing, equivalence ratio, and engine speed. While the engine operation was stable, the reentrant bowl-in-piston (a characteristic of a CI engine) influenced the combustion event such as producing a significant late combustion, particularly for advanced spark timing. This was due to an important fraction of the fuel burning late in the squish region, which affected the end of combustion, the combustion duration, and the cycle-to-cycle variation. However, the lower cycle-to-cycle variation, stable combustion event, and the lack of knocking suggest a successful conversion of conventional diesel engines to NG SI operation using the approach described here.

Sign in / Sign up

Export Citation Format

Share Document