Investigation of real operation gaseous emissions from a diesel locomotive. (August 2022)

• Record Type: Journal Article
• Authors: Chong, Hwan S.; Lim, Yunsung; Lee, Jongtae; Cho, Seokho; Park, Duckshin
• Is Part Of: Transportation research. Volume 109(2022)
• Publication Date: 2022-08
• Subjects: Gaseous emissions -- Diesel locomotive -- PEMS -- BMEP -- Speed density method; BMEP Brake mean effective pressure -- BSFC Brake-specific fuel consumption -- BTE Brake thermal efficiency -- DC Direct current -- DOC Diesel oxidation catalyst -- DPF Diesel particulate filter -- EC Element carbon -- EGR Exhaust gas recirculation -- ISM In service monitoring -- LNT Lean NOx trap -- NIER National Institute of Environmental Research -- NRMM Non-road mobile machinery -- PAH Polycyclic aromatic hydrocarbons -- PEMS Portable Emissions Measurement System -- PM Particulate matter -- RDE Real driving emission -- SCR Selective Catalytic Reduction -- THC Total hydrocarbon -- c Pre-condition of combustion in the engine cylinder -- e Post-condition of combustion in the engine cylinder (exhaust emission) -- CxHyc Hydrocarbon fuel in the pre-combustion condition -- CxHye Unburned hydrocarbon emission in the post-combustion condition -- nO2 Molar quantity of oxygen -- nCO2 Molar quantity of carbon dioxide -- nH2O Molar quantity of water -- nCO Molar quantity of carbon monoxide -- nNO Molar quantity of nitrogen oxide -- nNO2 Molar quantity of nitrogen dioxide -- nN2 Molar quantity of N2 -- mO2 Mass of oxygen -- mCO2 Mass of carbon dioxide -- mH2O Mass of water -- mCO Mass of carbon monoxide -- mNO Mass of nitrogen oxide -- mNO2 Mass of nitrogen dioxide -- mN2 Mass of N2 -- mCxHy Mass of fuel -- MCxHy Molar mass of fuel -- MC Mass of solid carbon -- αa Volumetric quantity of a -- αb Volumetric quantity of b -- ṁN, N2 Mass flow rate of nitrogen element from N2 -- ṁN, NO Mass flow rate of nitrogen element from NO gas -- ṁN, NO2 Mass flow rate of nitrogen element from NO2 gas -- ṁC, H, CxHyc Mass flow rate of carbon and hydrogen elements from fuel -- ṁC, CxHy Mass flow rate of carbon element from total unburned hydrocarbons in the exhaust -- ṁH, CxHy Mass flow rate of hydrogen element from total unburned hydrocarbons in the exhaust gas -- ṁC, CO Mass flow rate of carbon element from CO -- ṁC, CO2 Mass flow rate of carbon element from CO2 -- ṁH, H2O Mass flow rate of hydrogen element from water vapor -- ṁC, EC Mass flow rate of solid carbon element consisting of PM -- βa Ratio of the mass flow rate of a in the exhaust gas to that of N2 in the engine -- γa Ratio of the mass flow rate of a in the exhaust gas to that of fuel in the engine -- ṁae Mass flow rate of a in the exhaust emission -- ṁN2 Total mass flow rate of N2 -- ṁCxHyc Total mass flow rate of fuel -- MCx Total molar mass of carbon element in the unburned hydrocarbons -- MHy Total molar mass of hydrogen element in the unburned hydrocarbons -- MC Total molar mass of carbon -- MH2 Total molar mass of H2 -- ṁNOx Total mas flow rate of NOx -- ṁNO Total mas flow rate of NO -- ṁNO2 Total mas flow rate of NO2 -- ṁair Total mas flow rate of air -- ṁO2 Total mas flow rate of O2 -- Mair Molar mass of air -- MO2 Molar mass of O2 -- ṅair Molar flow rate of air -- ηv Volumetric efficiency of engine -- PM Cycle average intake pressure of air entering the engine -- Vd Engine displacement -- Nr Engine speed -- R Universal gas constant -- Tin Intake air temperature -- Ns Number of engine revolutions per air entering the cylinder -- ρair the air density -- power Engine brake power; Transportation -- Research -- Periodicals; Transportation -- Environmental aspects -- Periodicals; 354.76
• DOI: 10.1016/j.trd.2022.103372
• Languages: English
• ISSNs: 1361-9209

Abstract

Highlights: The high BSFC at the idle operation decreases as the BMEP increases. Highest BTE at the mid-BMEP, corresponding to 50% load condition. Total amount of gaseous emissions increases as the BMEP increases. Lowest brake specific gaseous emissions at the mid-BMEP. Test mode including high emission-measured condition provides with low uncertainty. Abstract: Many investigations on the fuel consumption and the emission characteristics of diesel engines for non-road mobile machinery (NRMM) have been carried out in the various conditions of steady-state and transient operation, and the knowledge obtained from these studies provides substantial information to analyze real operation emissions. Detailed information on the fuel efficiency and the emission under the real operation condition, however, is still needed to provide significant information to develop the advanced after-treatment system as well as to analyse the fuel efficiency and emissions from the NRMM operating real-world conditions. This study aims to investigate the fuel efficiency and the gaseous emissions from a diesel locomotive. The experiment was carried out with a Portable Emissions Measurement System (PEMS), and studies the fuel efficiency, the overall gaseous emissions, the association of gaseous emissions and brake mean effective pressure (BMEP), and the load conditions for the emission measurement.