Investigation of natural gas energy fraction and injection timing on the performance and emissions of a dual-fuel engine with pre-combustion chamber under low engine load

Yousefi, Amin; Birouk, Madjid

doi:10.1016/j.apenergy.2016.12.046

Cited by 70 publications

(16 citation statements)

References 48 publications

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“…The temperature rise is repressed due to heat transfer to the cylinder walls causing incomplete combustion. Lean mixtures sitting beyond the flammability limits disrupt flame propagation and part of the mixture remains without burning, resulting in increased hydrocarbon emission [25].…”

Section: Discussionmentioning

confidence: 99%

Analysis of Combustion Process in Industrial Gas Engine with Prechamber-Based Ignition System

et al. 2018

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Application of a pre-combustion chamber (PCC) ignition system is one of the methods to improve combustion stability and reduce toxic compounds emission, especially NO x . Using PCC allows the operation of the engine at lean combustion conditions or the utilization of low calorific gaseous fuels such as syngas or biogas. The paper presents the results of an experimental study of the combustion process in two stroke, large bore, stationary gas engine GMVH 12 equipped with two spark plugs (2-SP) and a PCC ignition system. The experimental research has been performed during the normal operation of the engine in an industrial compression station. It was observed that application of PCC provides less cycle-to-cycle combustion variation (more than 10%) and nitric oxide and carbon monoxide emissions decreased to 60% and 26% respectively. The total hydrocarbon (THC) emission rate is 25% higher for the engine equipped with PCC, which results in roughly two percent engine efficiency decrease. Another important criterion of engine retrofitting was the PCC location in the engine head. The experimental results show that improvement of engine operating parameters was recorded only for a configuration with one port offset by 45 • from the axis of the main chamber. The study of the ignition delay angle and equivalence ratio in PCC did not demonstrate explicit influence on engine performance.

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Section: Discussionmentioning

confidence: 99%

Analysis of Combustion Process in Industrial Gas Engine with Prechamber-Based Ignition System

et al. 2018

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“…The necessity to limit the amount of substitute fuel to about 20-30% is the major challenge from the economic perspective. On the other hand, dual-fuel mode presents certain drawbacks at low loads, particularly concerning unburned hydrocarbon UHC and CO emissions [11]. Inadequate dosage of the original fuel substitute effectively hinders the largescale spread of this technology (comparable to LPG).…”

Section: Introductionmentioning

confidence: 99%

Strength Analysis of the CNG Direct Injector for the Combustion Ignition Engine in Real Driving Conditions

2019

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The paper presents the results of strength test simulations of the CNG injector structure for direct injection of compression-ignition engines. This article is a continuation of the works presented in paper [1]. Life cycles estimation of particular parts of the injector were calculated using the Kocańda relation. The simulation tests of injector strength carried out earlier have allowed us to determine the stress concentration points. On the basis of NEDC driving tests carried out in three different cars, engine load histograms were made for subsequent runs and an average load profile was determined. For the points most exposed to damage, i.e. the needle and injector housing, the stress curve was generated as a function of time. This dependence was the base for fatigue calculations with the use of MatLab program in order to calculate the limit number of repetitions for a given injector element. All the calculation works have served to determine the maximum number of work cycles of a given injector design.

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“…Yousefi et al simulated the combustion and emission characteristics of a premixed natural gas DF engine by coupling the CFD software with chemical reaction kinetics. They found that the use of PCC structure reduced the unburned methane emissions by an average of 46% compared to dual fuel engines without PCC [21]. Cernik et al proposed a quasi-dimensional combustion model for a large-bore two-stroke dual-fuel marine engine.…”

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confidence: 99%

Effect of Pre-Combustion Chamber Nozzle Parameters on the Performance of a Marine 2-Stroke Dual Fuel Engine

Guo¹,

Zhou²,

Shreka³

et al. 2019

Processes

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In recent years and with the increasing rigor of the International Maritime Organization (IMO) emission regulations, the shipping industry has focused more on environment-friendly and efficient power. Low-pressure dual-fuel (LP-DF) engine technology with high efficiency and good emissions has become a promising solution in the development of marine engines. This engine often uses pre-combustion chamber (PCC) to ignite natural gas due to its higher ignition energy. In this paper, a parametric study of the LP-DF engine was proceeded to investigate the design scheme of the PCC. The effect of PCC parameters on engine performance and emissions were studied from two aspects: PCC nozzle diameter and PCC nozzle angle. The results showed that the PCC nozzle diameter affected the propagation of the flame in the combustion chamber. Moreover, suitable PCC nozzle diameters helped to improve flame propagation stability and engine performance and reduce emissions. Furthermore, the angle of the PCC nozzle had a great influence on flame propagation direction, which affected the flame propagation speed and thus the occurrence of knocking. Finally, optimizing the angle of the PCC nozzle was beneficial to the organization of the in-cylinder combustion.Processes 2019, 7, 876 2 of 17 dead center (TDC), which is used to ignite the gas/air mixture. In addition, this engine uses the Otto cycle principles to reduce the peak in-cylinder combustion pressure and temperature-resulting in low Nitrogen Oxides (NOx) emissions [11]. The main advantages of this engine include high efficiency at high load, high mean effective pressure, and low NOx emissions [12].At present, the marine low-pressure dual-fuel engine is represented by WinGD's RT-Flex50DF engine. Compared with traditional low-speed 2-stroke diesel engines using heavy fuel oil (HFO) or Light Fuel Oil (LFO), the LP-DF engine reduced the particulate matter (PM) to almost 98% and the SOx emissions by nearly 99% [13]. Besides, this engine decreased the NOx emissions by about 90%, which means that the IMO Tier III emission standard can be fulfilled without the use of after-treatment devices. The power and the thermal efficiency of the dual-fuel engine are close to those of conventional low-speed marine engines, but its emissions performance has been significantly improved. Furthermore, the marine DF engine can easily switch between the gas mode and the diesel mode to achieve smooth operation under full working conditions. Therefore, the DF engine technology is gradually gaining attention from various shipping companies due to its huge advantages and potential [14].Papagiannakis et al. used experimental methods to study the effect of air/fuel ratio on the thermal efficiency and the emissions of a DF engine. They reported that the engine efficiency was lower than that of the diesel engine in the DF mode after decreasing the air/fuel ratio (λ). Besides, the engine efficiency improved at medium and low load with the increase of the diesel injection quantity [15].The pre-ignition caused by lubric...

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Investigation of natural gas energy fraction and injection timing on the performance and emissions of a dual-fuel engine with pre-combustion chamber under low engine load

Cited by 70 publications

References 48 publications

Analysis of Combustion Process in Industrial Gas Engine with Prechamber-Based Ignition System

Analysis of Combustion Process in Industrial Gas Engine with Prechamber-Based Ignition System

Strength Analysis of the CNG Direct Injector for the Combustion Ignition Engine in Real Driving Conditions

Effect of Pre-Combustion Chamber Nozzle Parameters on the Performance of a Marine 2-Stroke Dual Fuel Engine

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