Experimental investigation on the combustion and emissions characteristics of an N-butanol/CTL dual fuel engine

Zhang, Hao; Guo, Liang; Yan, Yuying; Sun, Wanchen; Li, Jun; Wang, Qiao; Sun, Yi

doi:10.1016/j.fuel.2020.117696

Cited by 16 publications

(4 citation statements)

References 49 publications

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“…Experimental results showed that the blending of CTL/gasoline resulted in a higher premixed combustion ratio (PCR) and reduced NOx and particulate emissions. Zhang et al , conducted experimental studies on the combustion and emission characteristics of CTL/gasoline and CTL/ n -butanol dual-fuel modes. The results showed that the RCCI using CTL as the ignition fuel had a shorter combustion duration (CD), a 2% increase in the indicated thermal efficiency (ITE), and the peak pressure rise rate (PPRR) and NOx emissions were reduced by 46.1 and 20.1%, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The literature review presented above shows that the fuel characteristics and injection strategies significantly affect the combustion and emission characteristics of the RCCI combustion mode. Previous studies of our research group have shown that CTL with high CN as the ignition fuel of RCCI combustion mode is conducive to improving the thermal efficiency of the engine. − However, the use of CTL as a pilot fuel with a two-stage injection strategy in dual-fuel engines is expected to further improve the thermal efficiency of the engine, thus expanding the operating range of the RCCI combustion mode. But related research has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Effect of Two-Stage Injection Strategy for Coal-to-Liquid/Gasoline Reactivity-Controlled Compression Ignition Combustion Mode

Pan,

Sun,

Guo

et al. 2024

ACS Omega

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An experimental study was carried out on a modified single-cylinder dual-fuel engine in reactivity-controlled compression ignition (RCCI) mode using pilot fuels with different physicochemical properties, and the effects of the pilot fuels and the two-stage injection strategy on the combustion and emission characteristics of the RCCI mode were explored. The results show that when coal-to-liquid (CTL) is used with a high cetane number as the pilot fuel, the reactivity stratification of the fuel-air mixture is more pronounced. With the advancement of pilot injection timing (SOI1), the heat release rate (HRR) of the CTL/gasoline mode gradually changes from a bimodal pattern to a unimodal pattern. Among them, the bimodal HRR includes CTL premixed combustion and gasoline flame propagation, as well as CTL diffused combustion and gasoline multipoint spontaneous combustion, while the unimodal HRR represents CTL premixed combustion and gasoline multipoint spontaneous combustion. However, the HRR of the fossil diesel/gasoline RCCI combustion mode always exhibits a unimodal form. With the advancement of the main injection timing (SOI2), the gravity center of heat release (CA50) is more advanced when using CTL as the pilot fuel due to the short ignition delay. Overall, compared to fossil diesel, using CTL as the pilot fuel is conducive to controlling the pressure rise rate, which expands the operating range of the RCCI combustion mode. Besides, for both pilot fuels of CTL and fossil diesel, the advancement of SOI1 lowers particle emissions, and the advancement of SOI2 reduces NOx emissions, while the two-stage injection achieves higher indicated thermal efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Two-Stage Injection Strategy for Coal-to-Liquid/Gasoline Reactivity-Controlled Compression Ignition Combustion Mode

Pan,

Sun,

Guo

et al. 2024

ACS Omega

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“…The synthesis technology is relatively mature and has been widely used in practice. , CTL fuel produced by the Fischer–Tropsch synthesis is a high-quality and promising alternative fuel. , Compared with the conventional petrodiesel fuel, it has a higher cetane number (CN), contains fewer heavy distillation components, and can be fused with diesel fuel in any proportion. Additionally, CTL fuel has lower nitrogen, sulfur, and aromatic hydrocarbon content, higher calorific value, and a low freezing point; thus, it exhibits higher volatility, higher fuel reactivity, and combustion stability. − Research on CTL fuel has focused on its combustion and emission characteristics. Sun et al showed that CTL fuel has a higher reactivity that shortens the ignition delay (ID) period; while the application of CTL fuel reduces NO x emissions, it also results in higher particulate matter (PM) emissions compared to diesel fuel.…”

Section: Introductionmentioning

confidence: 99%

Spray and Combustion Characteristics of CTL–Diesel Fuel Blends in a Constant-Volume Combustion Chamber

et al. 2023

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Coal-to-liquid (CTL) fuel is considered a promising alternative fuel for diesel engine applications in China owing to its excellent fuel properties. However, little research on the spray and combustion processes of CTL fuel has been scarce. Therefore, in this study, the spray and combustion characteristics of diesel fuel blends with different CTL fuel blending ratios were investigated in a constant-volume combustion chamber. The results show that under non-evaporation conditions (300 K), a longer spray tip penetration (STP) and enlarged spray cone angle (SCA) were obtained with a higher injection pressure owing to the enhanced turbulent interaction. The SCA of CTL fuel blending was larger than that of diesel fuel owing to its lower viscosity and slightly shorter STP. Under the evaporation condition (700 K), with an increase in the CTL mixing ratio, both the STP and SCA of the fuel exhibited a decreasing trend owing to the higher volatility. Meanwhile, as the CTL mixing ratio increased, the ignition delay period was shortened, and the flame lift-off length decreased, whereas both the integrated natural flame luminosity and combustion duration increased. The cetane number of CTL fuel plays an important role in the occurrence of these results.

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“…In recent years, butanol has been widely studied as a liquid alternative fuel with great development potential. − Butanol is an alcohol fuel with four C atoms, and its molecular formula is C 4 H 9 OH. As a second-generation biofuel, butanol has the advantages such as high energy density, low volatility, low corrosiveness, and good miscibility with diesel and gasoline, making it a potential alternative fuel. , At the same time, with the continuous development of microbial fermentation technology, the manufacturing process of biobutanol based on renewable raw materials has gradually matured.…”

Section: Introductionmentioning

confidence: 99%

Effects of Intake Components on Combustion and Emission Characteristics in an n-Butanol/Diesel Blend Fueled Engine

et al. 2021

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To assess the effects of intake components and n-butanol application on compression-ignition engines, an experiment was carried out based on a singlecylinder engine fueled with n-butanol/diesel-blended fuel. The results show that with the increased n-butanol fraction of the blended fuel, the emissions of particulate mass (PM) decrease significantly, but the NO x and hydrocarbon (HC) emissions deteriorate. For B15 and B30, the PM emissions are 66.2% and 74.4% lower than B0, respectively. Furthermore, exhaust gas recirculation (EGR) was introduced to reduce the NO x emissions. However, a large EGR rate significantly reduces the indicated thermal efficiency (ITE) of the engine. Compared with the non-EGR condition, the ITE of B15 and B30 decrease by 3.1% and 3.8%, respectively, when the EGR rate is 18%. At the same time, the PM and HC emissions are found to be increased greatly. The PM emission of B15 and B30 increases by 69% and 46% and the HC emission increase by 150% and 71%, respectively. To restrain the engine emissions caused by the EGR, pure oxygen is further introduced into the intake charge. It is found that both the PM and HC emissions are significantly reduced with the introduction of extra oxygen. Under the condition of the 18% EGR rate, increasing oxygen addition to 4% can reduce HC emissions by more than 50% and the total particle mass of B15 and B30 is reduced by 60.6% and 47.7%, respectively. Moreover, the ITE reduction and combustion deterioration caused by the large EGR are found to be alleviated. By adjusting the n-butanol ratio, EGR rate, and oxygen addition, the excellent performance of combustion and emission can be achieved in an n-butanol/diesel blend fueled engine.

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Experimental investigation on the combustion and emissions characteristics of an N-butanol/CTL dual fuel engine

Cited by 16 publications

References 49 publications

Study on the Effect of Two-Stage Injection Strategy for Coal-to-Liquid/Gasoline Reactivity-Controlled Compression Ignition Combustion Mode

Study on the Effect of Two-Stage Injection Strategy for Coal-to-Liquid/Gasoline Reactivity-Controlled Compression Ignition Combustion Mode

Spray and Combustion Characteristics of CTL–Diesel Fuel Blends in a Constant-Volume Combustion Chamber

Effects of Intake Components on Combustion and Emission Characteristics in an n-Butanol/Diesel Blend Fueled Engine

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