Simulation Investigation on NOx Emission Characteristics and Mechanisms During Co-combustion of Fossil Fuels with Different Fuel-Nitrogen Distributions via CHEMKIN

2021 ◽  
pp. 739-750
Author(s):  
Chaowei Wang ◽  
Chang’an Wang ◽  
Lin Zhao ◽  
Maobo Yuan ◽  
Pengqian Wang ◽  
...  
Keyword(s):  
Fossil Fuels ◽  
Nox Emission ◽  
Emission Characteristics

Investigation of Performance and Emissions of a CRDI Passenger Van Fuelled With Coconut Methyl Ester-Diesel Blends Using Drive Cycle and Steady Speed Operation

2020 ◽  
Author(s):  
Rupert Karlo D. Aguila ◽  
Edwin N. Quiros ◽  
Jose Gabriel E. Mercado
Keyword(s):  
Steady State ◽  
Methyl Ester ◽  
Fuel Consumption ◽  
Fossil Fuels ◽  
Specific Fuel Consumption ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Drive Cycle ◽  
State Test ◽  
Steady State Test

Abstract For the past years, Different Philippine local regulations have been imposed to address oil importation and to address environment concerns. One requirement is reduced emission from diesel engines and at the same time reduce the use of fossil fuels for the. In accordance to the Clean Air Act and the Biofuels Act, The Philippine government is looking for possible alternatives to fossil fuels, One of the biodiesel the country is currently using is coconut methyl ester due to the abundance of coconut trees in the country. This research shows the performance and emission characteristics of diesel blended with coconut methyl ester in a CRDi Passenger van and will help the government justify the increase in blend percentage mandated in commercial fuels. This study is investigates 0%, 2%, 5% 10% and 20% Coconut Methyl Ester (CME)-diesel blends. The experiment consisted of Japanese 10-15 standard drive cycle test, steady state test at 40,60, & 80 kph was performed in the Vehicle Research and Testing Laboratory in the University of the Philippines Diliman equipped with chassis dynamometer, fuel flow meter and emissions analyzer. Performance parameters measured are Power, Specific Fuel Consumption and Mileage, while emission characteristics for CO, NOx, THC are measured. PM measurements were not measured for this experiment. In both Drive cycle and steady state test specific fuel consumption and mileage improved with addition of CME, however results showed they are independent of CME percentage. The best improvement was observed with 5%CME blended with neat diesel at 4.8% and 8.5% for drive cycle and steady state test respectively. Majority of the CME-diesel blends showed decrease in emission specifically in CO and THC emission which is consistent to published literature. For both steady state test and drive cycle test up to 29.5% decrease inn CO and up to 64% decrease in THC was observed. This can be attributed to the overall lean mixtures and in the increase of oxygenated fuel at higher CME blends. NOx emission however is consistent for all fuel blends in the drive cycle test while for the steady state test NOx emission is dependnt on the engine speed. Decreasing trend was obtained for 40 and 60 km/h while increasing trend was obtrained at 80 km/h, with respect to %CME. Average power produced for all the speeds was basically constant for all the blends as compared with neat diesel. Lastly, maximum power showed insignificant changes although majority of the blends showed a minimal power reduction as compared to neat diesel.

Experimental Study on Emissions of Hydrogen Enriched Diesel Engine With Varied Combustion Chamber Geometry

2016 ◽  
Author(s):  
Jyothi Us ◽  
K. Vijaya Kumar Reddy
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Flow Rate ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Oxides Of Nitrogen ◽  
Piston Bowl ◽  
Combustion Properties

The depletion of fossil fuels and its emissions promoted the researchers to search for substitute fuels and their controlled combustion. Hydrogen is considered as one of the best fuels for internal combustion engines because of its unique combustion properties. Currently, there are very few commercial devices that utilize hydrogen combustion for the production of heat, which is mainly due to the limited availability of hydrogen fuel. As the accompanying environmental legislation will clearly favour clean technologies, the emergence of hydrogen as an energy carrier will modify this situation. To achieve controlled combustion, an attempt was made at investigating the effect of change of piston geometry on the emission characteristics of diesel engine enriched with hydrogen at optimum flow rate. Experiments were conducted to study the effect of varied piston bowl geometry on the emission characteristics of diesel engine enriched with hydrogen at a flow rate of 6 lpm on four stroke single cylinder diesel engine at constant speed of 1500 rpm for different loads. For flow rates above 6 lpm knocking tendency was observed due to raise in temperature and peak pressures with addition of hydrogen. The experiments were conducted with standard hemispherical, toroidal and re-entrant toroidal piston bowl geometry at 6 lpm flow rate of hydrogen duly ensuring the same compression ratio in all three cases. The emissions for diesel engine enriched with hydrogen in hemispherical combustion chamber at 6 lpm flow rate were reduced by 27.1%, 37.5% and 10.8% of unburnt hydrocarbons (UHC), Carbon monoxide (CO) and smoke density respectively when compared to diesel fuel alone operation at rated load. This is mainly due to high combustion temperatures which lead to complete burning of fuel and reduction in carbon content with addition of hydrogen. However, there was a 14% increase in oxides of Nitrogen (NOx) emission due to high combustion temperatures by hydrogen induction. With toroidal and reentrant geometry of the combustion chambers at 6 lpm flow rate of hydrogen, the emission parameters were further reduced notably. Further there is an increase in NOx emission was observed in dual fuel mode compared to standard piston due to high cylinder temperatures and pressures. The obtained results show that at part load conditions with enriched hydrogen, the percentage reduction of NOx emission was engine load dependent, being least increase at low loads and high increase at high loads. The reduction in emission particulates with varied combustion chamber bowl geometry was due to improved swirl motion of high turbulence of air in the combustion.

Effects of Over Fire Air on the Combustion and NOx Emission Characteristics of a 600 MW Opposed Swirling Fired Boiler

2012 ◽  
Vol 512-515 ◽  
pp. 2135-2142 ◽  
Author(s):  
Yu Peng Wu ◽  
Zhi Yong Wen ◽  
Yue Liang Shen ◽  
Qing Yan Fang ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Empirical Method ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Cfd Model ◽  
Nitrogen Release ◽  
Computational Fluid Dynamics Cfd ◽  
Low Nox Emission

A computational fluid dynamics (CFD) model of a 600 MW opposed swirling coal-fired utility boiler has been established. The chemical percolation devolatilization (CPD) model, instead of an empirical method, has been adapted to predict the nitrogen release during the devolatilization. The current CFD model has been validated by comparing the simulated results with the experimental data obtained from the boiler for case study. The validated CFD model is then applied to study the effects of ratio of over fire air (OFA) on the combustion and nitrogen oxides (NOx) emission characteristics. It is found that, with increasing the ratio of OFA, the carbon content in fly ash increases linearly, and the NOx emission reduces largely. The OFA ratio of 30% is optimal for both high burnout of pulverized coal and low NOx emission. The present study provides helpful information for understanding and optimizing the combustion of the studied boiler

NOx Reduction Review on Fuel Alternative in Cement Kiln

2013 ◽  
Vol 864-867 ◽  
pp. 1626-1629
Author(s):  
Hai Bing Liu ◽  
Xiao Dong Chen ◽  
Jun Gu
Keyword(s):  
Nitrogen Content ◽  
Fossil Fuels ◽  
Nox Reduction ◽  
Reducing Agent ◽  
Environmental Benefits ◽  
Nox Emission ◽  
Cement Kiln ◽  
Cement Kilns ◽  
Low Nitrogen

The paper first discusses the relativity between alternative combustion andNOx emissions by a test in dry cement kiln, and a lot of case on fuel alternative The main findings of the study are that the use of RDF in cement kilns instead of coal or coke offers environmental benefits and reduce NOx emission. The conclusion is that the NOx generation can probably be lower because of lower flame temperatures or lower air excess and low nitrogen content in comparison with fossil fuels also is impartment reason., another a fact that most of the nitrogen (N) in biomass is released as ammonia (NH3) which acts as a reducing agent with NOx to form nitrogen (N2).

Effect of Cetane Number Improver on Emission Characteristics of Methanol/Diesel Blend Fuel

2012 ◽  
Vol 512-515 ◽  
pp. 1888-1891
Author(s):  
Jia Yi Du ◽  
Wei Xun Zhang ◽  
Deng Pan Zhang ◽  
Zhen Yu Sun
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Cetane Number ◽  
Nox Emission ◽  
Fuel Load ◽  
Emission Characteristics ◽  
Soot Emission ◽  
Maximum Torque ◽  
Blend Fuel ◽  
Co Emission

The influence of cetane number improver on emission characteristics of diesel engine fueled with methanol/diesel blend fuel was investigated. Methanol/diesel blend fuel was prepared, in which the methanol content is 10%, different mass fraction (0%，0.5%) of cetane number improver were added to the blend fuel. Load characteristic experiments at maximum torque speed of the engine were carried out on 4B26 direct injection diesel engine. The results show that, compared with the engine fueled with diesel, the CO emission increases under low loads and reduces under medium and high loads, the HC emission increases, the NOx emission decreases under medium and low loads and increases under high loads, the soot emission reduces significantly when the diesel engine fueled with blends. When cetane number improver was added to blends, the CO and NOx emission reduces, the HC emission decreases, the soot emission increases to some extent compared with the methanol/dieselblend fuel without cetane number improver.

Experimental study on NOx emission characteristics of oxy-biomass combustion

2018 ◽  
Vol 199 ◽  
pp. 400-410 ◽  
Author(s):  
Imran Ali Shah ◽  
Xiang Gou ◽  
Qiyan Zhang ◽  
Jinxiang Wu ◽  
Enyu Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Nox Emission ◽  
Biomass Combustion ◽  
Emission Characteristics

Combustion and NOx emission characteristics of dual-stage lean premixed flame

2019 ◽  
Vol 160 ◽  
pp. 113951
Author(s):  
Wenhua Zhao ◽  
Penghua Qiu ◽  
Li Liu ◽  
Wenkai Shen ◽  
Yajin Lyu
Keyword(s):  
Premixed Flame ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Lean Premixed ◽  
Dual Stage
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