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International Journal of Automotive Technology

, Volume 16, Issue 5, pp 721–731 | Cite as

Effects of argon dilution on the thermal efficiency and exhaust emissions of a NG engine

  • W. F. Li
  • Z. C. Liu
  • J. TianEmail author
  • Z. S. Wang
  • Y. Xu
Article

Abstract

Argon (Ar) is the third most common gas in the Earth’s atmosphere. About 700,000 tonnes of Ar are produced worldwide every year. Ar is inexpensive since it occurs naturally in air, and is readily obtained as a byproduct of cryogenic air separation in the production of O2 and N2. To decrease NOx emissions and slightly improve the thermal efficiency, Ar has been used in ICE before. However, it appears that it was used only in diesel and gasoline engines. This paper presents the effects of Ar dilution on the thermal efficiency and NOx emissions of a 6-cylinder natural gas SI engine. Ar was added into the intake charge at fixed boundaries under 1450 rpm and 50% load. The results show that the thermal efficiency increases first and then decreases with NOx emissions being decreased significantly as the dilution ratio (DR) of Ar increases. The thermal efficiency peaks at 9.8% DR with NOx emissions being decreased by 31.1%. At the maximum DR (18.4%), the thermal efficiency decreases by 0.3% with NOx emissions being decreased by 64.0%. Furthermore, from comparative experimental results it can be concluded that Ar dilution is superior in maintaining higher thermal efficiencies than CO2 and N2 for NG engines.

Key Words

CNG engine Argon dilution Combustion Thermal efficiency NOx emissions 

Nomenclature

AFR

air fuel ratio

Ar

argon

BMEP

brake mean effective pressure

BTDC

before top-dead-centre

CA

crank angle

CNG

compressed natural gas

CO

carbon monoxide

CO2

carbon dioxide

COV

cycle to cycle variations

cp

specific heat capacity at constant pressure

Cp

heat capacity of mixture at constant pressure

cv

specific heat capacity at constant volume

Cv

heat capacity of mixture at constant volume

DR

dilution ratio

EGR

exhaust gas recirculation

H2O

steam

HC

hydrocarbon

ICE

internal combustion engine

MAP

manifold air pressure

MFC

mass flow controller

MFM

mass flow meter

N2

nitrogen

NG

natural gas

NOx

nitrogen oxides

O2

oxygen

P

pressure in the cylinder

ppm

parts per million

PMEP

pump mean effective pressure

SCR

selective catalytic reduction

SI

spark ignition

ST

spark timing

T

temperature in the cylinder

THC

total hydrocarbon

TWC

three-way catalyst

λ

excess air ratio

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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • W. F. Li
    • 1
  • Z. C. Liu
    • 1
  • J. Tian
    • 1
    Email author
  • Z. S. Wang
    • 1
  • Y. Xu
    • 1
  1. 1.State Key Laboratory of Automotive Simulation and ControlJilin UniversityChangchunChina

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