Experimental study of co-combustion ratio on fuel consumption and emissions of NG–diesel dual-fuel heavy-duty engine equipped with a common rail injection system

Zhang, Chunhua; Song, Jiantong

doi:10.1016/j.joei.2015.06.005

Cited by 32 publications

(22 citation statements)

References 22 publications

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“…The primary pollutants of the LNG bus were NOx and HC. LNG buses had significantly higher HC emissions because it is difficult for LNG pressed into the crevice during the compression stroke to burn due to the high auto-ignition temperature of methane [41]. It resulted in a large amount of unburned methane in the crack of the combustion chamber.…”

Section: On-road Driving-based Emission Factorsmentioning

confidence: 99%

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Mao

et al. 2020

Atmosphere

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Previous works on real-world vehicle emission characteristics have mainly focused on the influences of fuel, speed, vehicle type, elevation, and other factors on vehicle emission quantity and components. However, few studies have investigated the transient trend of automotive exhaust emissions through on-road measurements. The key objective of the present paper was to examine the transient characteristics of exhaust emissions from different vehicle types on the roads of Tianjin. To achieve the goal, a portable emission measurement system (PEMS) was employed to monitor emissions from selected test vehicles—private cars, passenger vehicles, and cargo vehicles. It was found that the high-emission points of test vehicles were mainly distributed in two regions: the high-speed region (speed > 70–90 km/h, vehicle-specific power (VSP) > 0 kW/t) and the medium-speed–acceleration region (20–30 km/h < speed < 60–90 km/h, 0 kW/t <VSP < 12 kW/t). The CO, hydrocarbon (HC), NOx, and particulate number (PN) average emission rates in the high-emission points could be 3.15–14.93 times, 1.93–24.89 times, 3.23–6.03 times, and 3.22–30.27 times of those of average emission rates. The HC, NOx, and PN average emission rates of China IV vehicles in the high-emission points were 2.46–4.92 times, 3.56–6.03 times, and 3.22–13.21 times of those of average emission rates, not less than those of China III (1.93–2.52 times, 2.75–3.90 times, and 9.98–22.34 times). Test vehicles mainly emitted nucleation-mode and Aitken-mode particles, and the increase of the PN concentration emission rate in low-speed and high-speed regions was higher than that in the medium-speed region. The exhaust gas recirculation (EGR) + diesel particulate filter (DPF) could effectively inhibit the Aitken output caused by turbocharged intercooler (CIC). The selective catalytic reduction (SCR) might cause more nucleation-mode particles.

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Section: On-road Driving-based Emission Factorsmentioning

confidence: 99%

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Mao

et al. 2020

Atmosphere

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“…More information about the diesel-piloted NG engine can be found in the studies by Zhang and colleagues. 23,24 Equipment layout and data collection…”

Section: Fuel Supply Systemmentioning

confidence: 99%

Effects of the substitution rate of natural gas on the combustion and emission characteristics in a dual-fuel engine under full load

Lyu

Zhang

Bao

et al. 2017

Advances in Mechanical Engineering

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Diesel-piloted natural gas has been considered one of the most promising methods of using natural gas in a compression-ignition engine with few modifications, as this approach benefits from a high thermal efficiency resulting from a high compression ratio. This study experimentally investigated the impact of the natural gas substitution rate on the characteristics of combustion and emissions. Tests were performed under full-load operating conditions at a fixed speed of 1200 r/min with optimized injection timing, and the substitution rate of natural gas was varied with the fixed total fuel energy for different analyses. The in-cylinder pressure, pressure rise rate, heat release rate, cyclic variation of the maximum cylinder pressure (P max ) and emissions of HC, CO, NO x , and smoke were analyzed. The results indicate that P max and the maximum pressure rise rate initially increase and then decrease as the substitution rate of natural gas increases, whereas the heat release rate and standard deviation of P max increase. Moreover, HC and CO increase as the substitution rate of natural gas increases, whereas NO x and smoke emissions exhibit a trade-off trend.

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“…They used three types of fuel injectors with 3, 4, and 5 holes as well as varying pressures from 210 up to 240 bar and two types of combustion chamber to find proper matches of injectors and combustion chamber for the highest engine performance. Zhang and Song (2016) studied the combustion process in order to utilize liquid natural gas (LNG) on an electronically controlled common rail dual (diesel-NG) engine. In their study, the brake specific fuel consumption (BSFC) and the exhaust emissions under varied co-combustion ratios and speeds of 1200 rpm and 2200 rpm were compared and analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing the co-combustion ratio decreases the diffusive combustion of pilot diesel fuel. The emissions generation mechanism of dual-fueled systems falls between those of diesel diffusion combustion and NG flame propagation combustion (Zhang & Song, 2016).…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational fluid dynamics-based numerical simulation of using natural gas in a dual-fueled diesel engine

Akbarian

Najafi

Jafari³

et al. 2018

Engineering Applications of Computational Fluid Mechanics

118

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In this paper, investigations were performed on a dual-fueled constant-speed engine. Initially, the emissions and performance of a diesel engine were investigated, and after moving to the dual-fuel engine, experimental tests were carried out under different loads (10, 25, 50, 75, and 100% of the full load) and pilot to gaseous fuel (PGF) ratios (30, 40, and 50%). The results showed that under different loads and PGF ratios, the emissions of nitrous oxides and particle materials in the dual mode were lower than those for the diesel engine, and that the difference was significant. The emission of carbon dioxide in the dual-fueled mode varied little compared to that of the diesel mode, although it was lower than that for the diesel engine. In loads lower than 75% of the full load, the emission of carbon monoxide in the diesel engine was lower than that for the dual-fueled engine. However, in full load, this result was reversed and had significant difference. The dual mode had lower hydrocarbon emission compared to that of the diesel mode in all PGF ratios and loads. A computational fluid dynamics-based numerical simulation was performed by KIVA3V, and its results showed good agreements with the experimental results under cylinder pressure. ARTICLE HISTORY

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Experimental study of co-combustion ratio on fuel consumption and emissions of NG–diesel dual-fuel heavy-duty engine equipped with a common rail injection system

Cited by 32 publications

References 22 publications

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Effects of the substitution rate of natural gas on the combustion and emission characteristics in a dual-fuel engine under full load

Experimental and computational fluid dynamics-based numerical simulation of using natural gas in a dual-fueled diesel engine

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