Modeling analysis of urea direct injection on the NO x emission reduction of biodiesel fueled diesel engines

An, Hongyu; Yang, Wenming; Xu, Xiaolong; Zhou, Dezhi

doi:10.1016/j.enconman.2015.06.008

Cited by 24 publications

(6 citation statements)

References 32 publications

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“…Besides, biodiesel combustion starts earlier in the combustion chamber due to its higher bulk modulus providing more time for mixture formation [44]. Similar results were previously reported in the literature [45,46]. B80E20 fuel shows an increase in THC emission compared to B100 and D100.…”

Section: Thc Emissionssupporting

confidence: 81%

Effects of Diethyl Ether Introduction in Emissions and Performance of a Diesel Engine Fueled with Biodiesel-Ethanol Blends

et al. 2020

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Biofuels provide high oxygen content for combustion and do modify properties that influence the engine operation process such as viscosity, enthalpy of vaporization, and cetane number. Some requirements of performance, fuel consumption, efficiency, and exhaust emission are necessary for the validation of these biofuels for application in engines. This work studies the effects of the use of diethyl ether (DEE) in biodiesel-ethanol blends in a DI mechanical diesel engine. The blends used in the tests were B80E20 (biodiesel 80%-ethanol 20%) and B76E19DEE5 (biodiesel 76%-ethanol 19%-DEE 5%). Fossil diesel (D100) and biodiesel (B100) were evaluated as reference fuels. The results revealed similar engine efficiencies among tested fuels at all loads. The use of B100 increased CO and NOx and decreased THC compared to D100 at the three loads tested. B80E20 fuel showed an increase in NOx emission in comparison with all fuels tested, which was attributed to higher oxygen content and lower cetane number. THC and CO were also increased for B80E20 compared to B100 and D100. The use of B76E19DEE5 fuel revealed reductions in NOx and CO emissions, while THC emissions increased. The engine efficiency of B76E19DEE5 was also highlighted at intermediate and more elevated engine load conditions.

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Section: Thc Emissionssupporting

confidence: 81%

Effects of Diethyl Ether Introduction in Emissions and Performance of a Diesel Engine Fueled with Biodiesel-Ethanol Blends

et al. 2020

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“…As a result, urea-SCR was proposed, where ammonia is created on-vehicle by urea decomposition. Urea first decomposes into NH3, which then interacts with NOx to form N2 [38]. SCR conversion rates are typically in the 70-90 percent range.…”

Section: Selective Catalytic Reduction (Scr)mentioning

confidence: 99%

Experimental Study of Exhaust Manifold Water Injection on Emission of CI Engine Fueled with Madhuca Longifolia and Diesel Blends

Asfakahemad Shekh,

Nikul Patel,

Bhavesh Pathak

2024

ARFMTS

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Nitrogen dioxide (NO2) is the ubiquitous chemical structure of NOx in the ambience that is initiated by anthropogenic (human) acts. NO2 is also reacts in the surrounding to result in ozone (O3) and the main culprits for acid rain. Captured proportion of NOx by moisture forms acid rain. Acid rain severely affects certain ecosystems. The facts mentioned indicate necessity to reduce NOx pollution. When any of these oxides disintegrate in H2O and breakup, they result in nitric acid (HNO3) or nitrous acid (HNO2). Automobiles is one of the major sources of the NOx that is emitted. Here in this experimental based research effort has been made to reduce emissions of NOx and CO emitted by the diesel based engine powered by Madhuca longifolia as a biodiesel blended with diesel (B10, B20, B30) by injecting water after exhaust gas manifold to get reaction so as oxides disintegrate in H2O and breakup, they result in nitric acid (HNO3) or nitrous acid (HNO2). Experimental work conducted on Mono-cylinder CRDI engine. Trials were taken with different blends of Madhuca longifolia by setting CR 15,16, 17 and 18 with water injected at 3 different mass flow rates (38.7, 82.7, 130.4 CC/min). Results shows average reduction in NOx by 7.89%, 12.26%, and 17.73% respectively.

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“…The NO x mechanism, a so-called extended Zeldovich mechanism, comes from Tao's work [35], which is widely referenced in published articles [36][37][38]. The ammonia deNO x mechanism is collated and verified by Golovitchev [39] and it has been tested and verified as well [40,41]. This work combines these three sub-mechanisms to simulate the coupled effect of water and ammonia for the engine deNO x process with inner SNCR strategy.…”

Section: Geometric Model and Boundary Conditionsmentioning

confidence: 99%

Inner Selective Non-Catalytic Reduction Strategy for Nitrogen Oxides Abatement: Investigation of Ammonia Aqueous Solution Direct Injection with an SI Engine Model

et al. 2019

Energies

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This study contributes to a method based on an aqueous solution of ammonia direct injection for NO x emissions control from internal combustion engines. Many previously published studies about deNO x technology are based on selective catalytic reduction (SCR), but only few deal with inner selective non-catalytic reduction (inner SNCR) technology, which is an intensive improvement of selective non-catalytic reduction (SNCR) applied in the in-cylinder purification procedure. Before numerical calculations were carried out, the computational fluid dynamic (CFD) simulation model was validated with steady-state experimental results. The main results revealed that with the increasing concentration of aqueous solution of ammonia, nitrogen oxides gradually decrease, and the largest decline of NO x is 65.1% with little loss of cylinder peak pressure. Unburned hydrocarbon (UHC) and carbon monoxide (CO) may increase using inner SNCR, and soot emissions show a decreased tendency. However, there is little change when ammonia content varies. Ulteriorly, refining the direct injection phase is of great help to inner SNCR technology to enhance the reduction of NO x and reduce NH 3 oxidation and NH 3 slipping.Energies 2019, 12, 2742 2 of 18 water emulsion diesel as compared with diesel fuel. Adnan et al. [10] conducted an experimental investigation on the optimum water injection timing for power augmentation and emission control of a hydrogen fueled compression ignition (HFCI) engine. The results show that a longer injection duration introduces more water droplets into the cylinder, reducing the in-cylinder charge temperature, which leads to NO x reduction. Although, the amount of water by injecting or emulsifying requires special attention. Excessive water injection may lead to decreased power performance and increased incomplete combustion [11]. Thus, the NO x emissions are limited by increasing the amount of the injected water.SCR has been widely applied in the exhaust after-treatment device of internal combustion engines (ICE). Compared with the three-way catalytic converter (TWC), SCR is not strictly restricted by the equivalence ratio [12]. Thus, the application of SCR has more rationality and scientificity in lean burn gasoline engines and diesel engines. However, the traditional SCR technology has some blemishes, such as poor durability of SCR catalyst [13], narrow temperature window for active deNO x [14], catalyst deactivation due to particulates accumulation [15], catalyst poisoning effect caused by heavy metals (Pb, Zn, and so on, and their oxides) [16], high cost, and difficult recovery by using the noble metal catalysts. The miniaturization and compactification of SCR equipment are also very important factors, which influence the automobile lightweight, especially the passenger car [17]. These limitations led researchers to begin to focus on selective non-catalytic reduction (SNCR), which is another technical route to reduce NO x emissions. As a result of getting rid of the reliance on catalysts, engines with SNCR tec...

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Modeling analysis of urea direct injection on the NO x emission reduction of biodiesel fueled diesel engines

Cited by 24 publications

References 32 publications

Effects of Diethyl Ether Introduction in Emissions and Performance of a Diesel Engine Fueled with Biodiesel-Ethanol Blends

Effects of Diethyl Ether Introduction in Emissions and Performance of a Diesel Engine Fueled with Biodiesel-Ethanol Blends

Experimental Study of Exhaust Manifold Water Injection on Emission of CI Engine Fueled with Madhuca Longifolia and Diesel Blends

Inner Selective Non-Catalytic Reduction Strategy for Nitrogen Oxides Abatement: Investigation of Ammonia Aqueous Solution Direct Injection with an SI Engine Model

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