Dual Fuel Research Articles

Investigations into the Combined Effect of Mahua Biodiesel Blends and Biogas in a Dual Fuel Engine

Rapid depletion of conventional fuel sources has led to the use of alternative fuels and implementation of variant engine technologies to reduce deleterious emissions being released and deliver thermal energy for numerous applications. This research aims to study the usage of mahua methyl ester in a single-cylinder 4-stroke CI engine, optimized to operate in the dual fuel mode. Performance, combustion and emission characteristics are recorded and compared with diesel with the sole aim of finding the blend that provides adequate performance and diminishing emissions. To this effect, the percentage of mahua biodiesel blend, load, biogas flow rate and methane fraction are varied. The experimentation is conducted using three mahua biodiesel blend variants namely B10, B20 and B30. Gaseous fuel comprising biogas (CH4 and CO2 in ratio of 3:2) and methane (CH4) are incorporated in the dual fuel condition at 8 litre per minute (lpm) and 12 lpm. B20 blend demonstrated better performance and emission characteristics. The addition of biodiesel (B20) showed more than 5% improvement in brake thermal efficiency. Additionally, comparing with normal diesel mode, B20 showed lower CO (0.061%) and NOx (615 ppm) emissions. In the dual fuel condition, methane and biogas are effective in reducing the NOx emissions, but with a negative repercussion of extortionately elevated HC and CO emissions. The best combination is deduced to be B20 mahua biodiesel at 8 lpm of biogas flow rate in the dual fuel mode due to better performance and emission characteristics.

Combined Effect of CNG and EGR on the Performance, Emission and Combustion Characteristics of Diesel Engine in Dual Fuel mode

Severe and adverse energy crises in future, day by day ever elevating cost of fuels, dangerous emissions emitted with conventional fuels made internal combustion engine scientists to discover and look at the likelihood of usage of alternate, clean and less or zero emissions fluids and vaporous fuels for IC engines, especially compression ignition diesel engines (DE) since existing DE are under stringent pollutions regulation that too for smoke and NOx in their tail pipe fumes. The main target of this work is to examine the emission, combustion and performance attributes of a diesel engine running with a wide range of loads with a constant speed of 1500rpm with a 30% steedy energy share of CNG and varying EGR of 5%,10% and 15% using diesel as pilot fuel. BSEC of dual fuel mode engine is discovered superior to neat diesel engine mode at higher load. It is discovered that there is an uncommon decrease in NOX, CO2, and smoke density, increment in UHC, CO in the fumes of dual fuel engine at all loads. Comparative results are given for dual fuel mode with variable measures of EGR at various loads conditions and detailed the impact of the application of EGR on combustion, performance and emission processes.

Optimization of Dual-Fuel Combustion Synthesis for Rapid Formation of Solution-Processed Metal-Oxide Thin-Film Transistors

Solution processing of metal-oxide semiconductors has received significant attention in various fields of electronics owing to its advantages such as simple fabrication process, large-area scalability, and facile stoichiometric tunability. However, the conventional sol–gel route requires a relatively long annealing time to obtain a low-defect film with high density and sufficient amount of metal–oxygen–metal bonding state, which prevents implementation in cost-effective continuous manufacturing. Here, we report rapid formation of solution-processed oxide semiconductors by employing a dual-fuel-based solution combustion synthesis route. In particular, by optimizing the ratio of dual fuels of acetylacetone and 1,1,1-trifluoro-acetylacetone (molar ratio of 7:3), high-performance indium–gallium–zinc oxide (IGZO) thin-film transistors (TFTs) could be fabricated at 350 °C with the annealing time as short as 5 min (In:Ga:Zn = 0.68:0.1:0.22). Based on spectroscopic analysis, it was found that the dual fuels enabled rapid formation of the metal–oxygen–metal lattice structure with low defective oxygen bonding states. The IGZO TFTs fabricated with an optimized fuel ratio exhibited average field-effect mobilities of 1.11 and 3.69 cm2 V–1 s–1 with annealing times of 5 and 20 min, respectively (averaged in 9∼12 devices). Also, in the case of the 5 min annealed device, the threshold voltage was −0.48 ± 1.96 V, showing enhancement-mode operation. Furthermore, the device showed good stability against both positive gate bias stress and negative gate bias stress conditions with small threshold voltage shifts of −1.28 and – 1.28 V in 5760 s, respectively.

Numerical Investigation of Dual Fuel Combustion on a Compression Ignition Engine Fueled with Hydrogen/Natural Gas Blends

The present work aims to assess the influence of the composition of blends of hydrogen (H2) and Natural Gas (NG) on Dual Fuel (DF) combustion characteristics, including gaseous emissions. The 3D-CFD study is carried out by means of a customized version of the KIVA-3V code. An automotive 2.8 L, 4-cylinder turbocharged diesel engine was previously modified in order to operate in DF NG–diesel mode, and tested at the dynamometer bench. After validation against experimental results, the numerical model is applied to perform a set of combustion simulations at 3000 rpm–BMEP = 8 bar, in DF H2/NG-diesel mode. Different H2–NG blends are considered: as the H2 mole fraction varies from 0 vol% to 50 vol%, the fuel energy within the premixed charge is kept constant. The influence of the diesel Start Of Injection (SOI) is also investigated. Simulation results demonstrate that H2 enrichment accelerates the combustion process and promotes its completion, strongly decreasing UHC and CO emissions. Evidently, CO2 specific emissions are also reduced (up to about 20%, at 50 vol% of H2). The main drawbacks of the faster combustion include an increase of in-cylinder peak pressure and pressure rate rise, and of NOx emissions. However, the study demonstrates that the optimization of diesel SOI can eliminate all aforementioned shortcomings.

Numerical Investigation of the Effect of Biodiesel-Biogas Percentage on Performance Characters and Dual Fuel Engine Emissions as Green Technology on Ship

The discourse on the application of green technology in the maritime sector is an interesting agenda to implement. The development of the world of shipping transportation which continues to experience an increase in numbers and services creates new problems in terms of fuel supply and the resulting emissions. So that the development of innovation and technology for ship machinery should be directly related to fossil fuel substitution technology, operational efficiency technology, improving performance and reducing emissions from the engine itself to be achievements and targets. Good engine performance directly has an impact on increasing the operational efficiency of the ship and being a good carrying capacity in the environment with minimal emission levels. A dual-fuel engine is one of the engine system concepts that has several advantages, such as simple and relatively easy modifications and the use of natural gas which tends to be cleaner. Biodiesel and biogas are examples of alternative fuels that are expected to be promising solutions for marine engineering. This research uses a numerical study on the application of dual fuel engines, the percentage of biodiesel-biogas is carried out with variations of 50:50 and 25:75, at a constant engine speed of 2200 RPM. Simulations were carried out to see the results of how the engine performance, cylinder pressure, heat release rate and HC and NOx emissions were at a constant speed variation of the fuel percentage test NOx emission decreased at a higher biogas percentage, for UHC it increased at a higher biogas percentage, it is possible to add oxygen intake through a turbocharger or supercharger as an auxiliary equipment.

Effect of negative valve overlap in a heavy-duty methanol-diesel dual-fuel engine: A pathway to improve efficiency

Methanol (MeOH) is a promising low-carbon liquid fuel to provide global energy security with a potential to achieve net-zero greenhouse gas emissions in transport sector. However, its utilization in diesel engines at high MeOH substitution ratios (MSR) suffers from misfire or high pressure rise rates owing to its distinct physio-chemical properties. This issue is addressed in the present study by adopting negative-valve overlap (NVO) and hot residual gases from the previous cycle. Experiments are performed in a single-cylinder heavy-duty CI engine for a constant MSR (90% energy based) and an engine speed of 1500 rpm. The aim of the study is to investigate the effects of 1) NVO period, 2) charge-air temperature (Tair), 3) MeOH lambda (λMeOH) on the MeOH-diesel dual-fuel (DF) combustion in NVO mode, and 4) to demonstrate the implications of NVO in yielding high net-indicated efficiency (ηind) together with low pollutant emissions at a wide range of engine operating loads (40–90%). The results show that the hot residual gases from the previous cycle enhance the reactivity of the fresh MeOH-air mixture by inducing slow oxidation processes before TDCf. The slow pre-flame oxidation processes are disruptive or oscillatory in nature, wherein NVO period, Tair and λMeOH can be used to control these processes and their induced reactivity enhancing capability. It is noticed that the pre-flame oxidation processes and the main combustion have a direct correlation between them. Based on the control strategy, the MeOH-diesel combustion in the NVO mode produced on average ηind of approx. 53% accompanied with very low NOx emission of 1.1 g/kWh at a wide range of engine operating loads (40–90%). Additionally, on average the combustion phasing (CA50) is maintained at ∼ 2 oCA aTDC, while the combustion stability remains high (COVIMEP ∼ 3.5%).

Prediction of Overall Characteristics of a Dual Fuel CI Engine Working on Low-Density Ethanol and Diesel Blends at Varying Compression Ratios

Prediction of Overall Characteristics of a Dual Fuel CI Engine Working on Low-Density Ethanol and Diesel Blends at Varying Compression Ratios

Electricity Supply Strategy for PT Freeport Indonesia’s Production Expansion

PT Freeport Indonesia (PTFI) plans to build a new power generation facility in the face of production expansion, especially underground mine and mill optimization, which has an impact on increasing the demand for electricity up to 374.8 MW. The selection of the right type of power plant, will greatly determine the continuity of the electricity supply operation. There are many things to consider, making it difficult for companies to determine the type of new power plant. Therefore, this study aims to (1) determine the most important factors to consider in the construction of PTFI's new power plant; (2) provide recommendations for the choice of the best type of new power plant for PTFI. This study uses the method of literature review, expert interviews and questionnaires, which are processed using the Analytical Hierarchy Process (AHP) method. The results of the study indicate that conformity with the existing power generation facilities and support from government policies are the most important factors and sub-factors that must be considered by PTFI in the construction of new power plants in the Special Mining Business License (IUPK) area. The recommended type of new power plant is the Dual Fuel Power Plant (DFPP). Keywords: analytical hierarchy process, consideration factors, electricity supply strategy, power generation, production expansion

Optical Equivalence Ratio Measurement of a Dual Fuel Burner for Natural Gas and Kerosene

A measurement technique for determination of the global and local equivalence ratios from the flame chemiluminescence for a swirl-stabilized lean premixed combustion of natural gas and kerosene is presented. First, we conducted spectrally resolved chemiluminescence studies using an imaging spectrometer to correlate the ratio of individual chemiluminescence signals to the equivalence ratio. Flame spectra were recorded for a multitude of different lean operating conditions for natural gas and kerosene combustion. The spectra show that, without background correction, the CH*/CO2* ratios for both natural gas and kerosene combustion exhibited a monotonic relationship to the equivalence ratio in the investigated range. Subsequently, bandpass-filtered images of CH* and CO2* chemiluminescence were acquired simultaneously on one camera chip using an image doubler to investigate the local relationship of the CH*/CO2* ratio with the equivalence ratio. The ratio images corroborate the monotonic relationship of the CH*/CO2* ratio to the equivalence ratio. Furthermore, the ratio was found to be influenced by the local reaction zone temperature. The presented technique allows high temporal resolution determination of the local equivalence ratio in lean premixed natural gas and kerosene flames and can thus be applied to quantify equivalence ratio oscillations during unstable combustion.

Influences of hydrogen addition from different dual‐fuel modes on engine behaviors

AbstractCompression ignition (CI) engines have good performance but more exhaust emissions. Dual fuel (DF) engines have better performance and lower emissions compared to CI mode. Also, the scarcity of fossil fuels made the researchers to find alternative fuels to power CI engines. Therefore, the present work aims to use hydrogen (H2) and honne oil biodiesel (BHO) to investigate the performance of CI engines in DF mode. Also, it aims to compare the performance of CI engines in various DF modes, namely induction, manifold injection, and port injection. First, the CI engine was fuelled completely by diesel fuel and BHO. The data were gathered when the engine ran at a constant engine speed of 1500 rpm and at 80% load. Second, the CI engine was operated in various DF modes and data were generated. CI engine operation in DF mode was smooth with biodiesel and H2. The brake thermal efficiency (BTE) of 32% and 31.1% was reported with diesel and biodiesel, respectively, for manifold injection due to low energy content and high viscosity of biodiesel. These values were higher than CI mode and other DF modes. Fuel substitution percentage for DF manifold injection was 60% and 57% with diesel and biodiesel, respectively. Smoke, hydrocarbon (HC), and carbon monoxide (CO) emissions were lower than conventional mode, but a reverse trend was observed for oxides of nitrogen (NOx) emissions. Heat release rate (HRR) and peak pressure (PP) were higher than conventional mode due to the fast combustion rate of hydrogen. The shortest ignition delay (ID) period was noticed for traditional diesel fuel, but it was longer for BHO biodiesel due to its higher viscosity and lower cetane number. On the contrary, the presence of hydrogen led to an increment in the combustion duration (CD) owing to the scarcity of oxygen in CD. Consequently, the paper clearly showed that the injection way of hydrogen plays a respectable role in the engine characteristics.

Investigation of the Performance and Emission Characteristics of Diesel Engine Fueled with Biogas-Diesel Dual Fuel

Due to the popularity of diesel engines, utilization of fossil fuel has increased. However, fossil fuel resources are depleting and their prices are increasing day by day. Additionally, the emissions from the burning of petroleum-derived fuel is harming the global environment. This work covers the performance and emission parameters of a biogas-diesel dual-fuel mode diesel engine and compared them to baseline diesel. The experiment was conducted on a single-cylinder and four-stroke DI diesel engine with a maximum power output of 2.2 kW by varying engine load at a constant speed of 1500 RPM. The diesel was injected as factory setup, whereas biogas mixes with air and then delivered to the combustion chamber through intake manifold at various flow rates of 2, 4, and 6 L/min. At 2 L/min flow rate of biogas, the results were found to have better performance and lower emission, than that of the other flow; with an average reduction in BTE, HC, and NOx by 11.19, 0.52, and 19.91%, respectively, and an average increment in BSFC, CO, and CO2 by 11.81, 1.05, and 12.8%, respectively, as compared to diesel. The diesel replacement ratio was varied from 19.56 to 7.61% at zero engine load and 80% engine load with biogas energy share of 39.6 and 16.59%, respectively.

Analysis of Exhaust Gas Emissions on Dual Fuel Diesel Engine Single Cylinder Four-stroke with LPG-Diesel Oil

Diesel engine is one of type of internal combustion engine that is applied in industry, including the maritime industry. The increasing use of diesel engines, has a effect on increasing emissions. Diesel engines emissions consist of SOx, NOx, HC, and others. To reduce the emissions, there are many method, one of them is using dual-fuel system. The alternative fuel can be used is Gas, which is easily available, namely LPG or liquefied petroleum gas. To supply LPG to combustion chamber, a converter-kit are needed to be install on diesel engine. There are several previous research that prove that LPG can be used as an alternative in a dual-fuel system and can reduce the emissions. One of them by Ma’amuri (2016) who designed a mechanical LPG-diesel oil as dual-fuel, using a membrane converter. Result of this research provide that good diesel engine performance. In this research, LPG-diesel oil as dual-fuel using converter kit based on ECU or electronic control unit, and then, analyze the diesel engine emissions with experimental method. The purpose of this research is to determine the emissions produced by LPG-diesel oil as dual-fuel with converter kit based ECU. After taking and analytical data, known that the NOx emission from dual fuel diesel engine using ECU-based converter kit is lower than NOx emission from conventional diesel engine with B30 diesel fuel with percentage is 25,61 % for 3ms opening duration of gas injector, 39,99 % for 4 ms opening duration of gas injector and 26,5 % for 5 ms opening duration of gas injector. The NOx emission of conventional diesel engine is 2,46 g/kWh.

Life cycle energy consumption and environmental assessment for utilizing biofuels in the development of a sustainable transportation system in Ethiopia

Ethiopia’s transportation sector is currently dominated by internal combustion engine vehicles running using imported petroleum oil. Due to shortages in hard currency, a rising economy and population growth, and rapid industrialization, energy security to meet the national demand for transport is a quite severe problem. As a result, Ethiopia is strengthening its effort to look for clean alternative energy sources, such as biofuels and electricity. Ethiopia’s biofuel program relies on cane molasses-based ethanol and jatropha based biodiesel for blending into conventional petroleum fuels. In order to investigate the sustainability of Ethiopian biofuel production and use in transportation fuels in terms of their energy balance and environmental impacts, well-to-wheel (WTW) analysis was conducted. The WTW energy saving, greenhouse gas (GHG) emission reduction benefits and criteria air pollutants of blending different commonly used ratios of ethanol with gasoline, biodiesel with diesel and electricity mix (mostly (90%) from hydropower) were analysed in the Ethiopian situation. It is found that both ethanol and biodiesel production has shown net energy gain and reductions in GHG emissions which indicates sustainability and, therefore, could be good substitutes for petroleum fuels if their production pathways are properly managed and implemented. Flexible fuel vehicles (FFVs) fuelled with a blend of 85% ethanol and 15% gasoline (E85) could save 65% fossil fuels and 29% of GHG emission reductions compared to neat gasoline vehicles. Compared to neat diesel vehicles, a blend of 20% biodiesel and 80% diesel (B20) powered vehicles could save 15% fossil energy and could remove 12% of GHG emissions per kilometre driven. Hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV) with biofuels (ethanol and biodiesel), gasoline, and diesel showed higher savings of fossil fuel energy and less GHG emissions in every scenario.

Impact of dual fuel compression ignition engine on its performance, combustion and emission characteristics

The scarcity and rapid depletion of traditional petroleum supplies, as well as worldwide agreement to stabilize carbon emission concentrations in the atmosphere, have fueled research into alternative fuels for internal combustion engines. Among the many biodiesel resources, Used Frying Oils (UFO) without any other chemical processing have been shown to have the ability to reduce massive import oil expenses while reducing net CO2 gases into the environment However, because to their high viscosity and minimal volatility, UFO fueled engines have been known to have operating and durability issues. This research analyses the potential of using UFO as a biofuel mix in a compression ignition engine with no changes to injection pressure or ignition advance. Experiments were conducted in a 4.4 kW, naturally aspirated, 4-stroke, constant speed, air cooled, direct - injection engine with varied UFO and Jatropha Methyl Ester (JME) mix proportions to study the combustion, pollutant, and performance parameters. The results of UFO bio dual fueling with JME were compared to the results of JME. Various variables such as in-cylinder pressure, emissions, fuel consumption, speed, and so on were examined in order to get crucial parameters such as brake thermal efficiency and brake specific fuel consumption. Engine performance, emission, and combustion characteristics were determined to be similar to JME fuel when using UFO mixes. In summary, the use of UFOs in conjunction with biofuel would be a realistic solution for achieving self-sufficiency in addressing the exponentially expanding oil demand. From the test results, it is found that the performance of UFO blended JME is higher than that of neat JME due to its intrinsic physiochemical properties.

PERFORMANCE OF A DUAL FUEL DIESEL ENGINE FUELED WITH JOJOBA BIODIESEL AND COIR PITH GAS

PERFORMANCE OF A DUAL FUEL DIESEL ENGINE FUELED WITH JOJOBA BIODIESEL AND COIR PITH GAS

Comparison of fuel consumption and emission of small two-stroke engine of electric generator fuelled by methanol, biogas, and mixed methanol-biogas

A two-stroke engine run with flexible fuel of biogas or methanol is not established yet. It is the objective of this work to provide 2 stroke engine for an electric generator that can be run by using flexible fuels namely: methanol, biogas, and mixed methanol-biogas. A small single cylinder 2 stroke engine of an electric generator was set to be able to be fuelled by using 3 different types of fuel namely biogas (50% vol. CH4, 15% vol. CO2, 0 ppm H2S), methanol (CH3OH) with 97% vol. purity and mixed biogas-methanol. The electric generator that is used is for providing 750-watt electricity. The compression pressure was around 10 Bar with cylinder volume around 63 cc. The engine was set with an easy switch system of fuel. Since methanol is used as one type of fuel that is used, then special lubricant should be prepared for this purpose. It is generally known that commercial synthetic lubricant that is usually used and mixed with gasoline for 2-stroke engines is found not well mixed with methanol. The castor oil is selected to be used as a lubricant to be mixed with methanol with a ratio of methanol to castor oil of 50:1. During using only biogas as a fuel, the castor oil was dripped around 3 drops/minute in the biogas-air mixer chamber. The emission, as well as fuel consumption, were investigated both in idle position and loaded at 200 watts. It is found that for only biogas fuel, the fuel consumption is 18.83 L/minute and increases to become 15, 17 L/minute at a load of 200 watts. By using only methanol as a fuel, the fuel consumption is found 0.009 L/minute and increases to become 0.011 during loading at 200 watts. If mixed fuel is applied the biogas consumption becomes 2.06L/minute in idle position and 4.43 L/minute at a load of 200 watts. The lowest CO emission in idle position was found with biogas as fuel at 0.18 % vol., followed by mixed fuel biogas+ methanol at 0.26% vol. and the highest is methanol fuel at 0.25%vol. for a load of 200 watts, the lowest CO emission is found the same at biogas fuel at 0.18% vol., followed by mixed biogas + methanol at 0.011 % volume, and the worst is found for methanol fuel with CO emission of 0.33 % vol.

Highly Flexible Solid Oxide Fuel Cells Using Phase-Controlled Electrolyte Support

Highly Flexible Solid Oxide Fuel Cells Using Phase-Controlled Electrolyte Support

The use of alternative fuels to mitigate climate change impacts in the transportation sector in Rio de Janeiro, Brazil

This paper assesses how increased use of alternative fuels (ethanol and electricity) contributes to reduce carbon dioxide (CO2) emissions of light-duty vehicles in Rio Janeiro state (RJ), Brazil, a region of a developing country – most such analysis focus at the aggregate country level. Using an energy systems model (OSeMOSYS), we analyze scenarios that consider an improvement in the quality of the ethanol (in gCO2eq/MJ) consumed in RJ due to the development of the RenovaBio program, greater uptake of electric vehicles, carbon pricing, and a combination of these policies. We also analyze a scenario with the new RenovaBio targets, which the Brazilian government scaled down because of the COVID-19 pandemic. We find that electric vehicles are the most cost-effective policy to reduce CO2 emissions (by 1.9%) when no carbon pricing is considered. When it is, however, CO2 emissions are reduced the most (between 47% and 56%), regardless of the vehicle technology being used, but it is the costlier policy (between 5.4% and 15.3%). In scenarios with carbon pricing, flex-fuel vehicles switch to ethanol, an important result for a region where this technology already dominates the vehicle fleet. Greater uptake of electric vehicles leads to lower overall transportation costs (by 2.5%), but when a CO2 price is considered, because the electricity system still relies on fossil fuels, the reduction in CO2 emissions is compromised. In such a setting, increased ethanol quality reduces carbon emissions more than electric vehicle adoption (by 16%). The RenovaBio targets’ reduction due to the COVID-19 pandemic, however, jeopardizes this result. Such findings convey important evidence to policymakers and the research community: decarbonization of transportation in a region of a developing country, where economic resources are scarcer, can start before electric vehicles become affordable by increasing and maintaining continued access to lower-carbon fuels.

Study on Injection Strategy of Ammonia/Hydrogen Dual Fuel Engine Under Different Compression Ratios

Study on Injection Strategy of Ammonia/Hydrogen Dual Fuel Engine Under Different Compression Ratios

A Study on Combustion and Emission Characteristics in NH3-Diesel Dual Fuel Engine under High Load Condition

A Study on Combustion and Emission Characteristics in NH₃-Diesel Dual Fuel Engine under High Load Condition