Research on NOx Emission Aftertreatment of Lean Burn Gasoline Engine Using Adsorber Reduction Catalyst

2007 ◽  
Author(s):  
Zhengmao Ye ◽  
Zhijun Li ◽  
Habib Mohamadian
Keyword(s):  
Engine Speed ◽  
Gasoline Engine ◽  
Operating Time ◽  
Nox Emission ◽  
Emission Characteristic ◽  
Lean Burn ◽  
Gasoline Engines ◽  
Wide Range ◽  
Nox Adsorber ◽  
Novel Catalyst

A novel catalyst converter system has been developed for NOx emission aftertreatment of lean burn gasoline engines. The goal is to investigate its impact on emission characteristic and Break Specific Fuel Consumption (BSFC) across a wide range of engine speed and load operating regions, subject to several arrangement schemes for this catalyst converter. It has been indicated from experimental results that the upstream placement of TWC (Three Way Catalyst) ahead of the NOx Adsorber Catalyst is the best solution, which gives rise to the highest converting efficiency to reduce the NOx emission level of the lean burn gasoline engine. The effects of engine speed on exhaust emissions and BSFC are also reflected by operating time of lean mode and rich mode as well as the time ratio between the two using adsorber-reduction catalyst converters. Engine load is in fact the major factor in affecting exhaust characteristics and BSFC of lean burn engines.

Analysis Research of Technology Schemes of Reduction NOx Emission in Lean Burn Gasoline Engine

2013 ◽  
Vol 724-725 ◽  
pp. 1454-1458
Author(s):  
Dong Peng Yue ◽  
Wen Zhang ◽  
Zhi Jun Li ◽  
Ying Zhang ◽  
Lei Liu ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
Nox Emission ◽  
Lean Burn ◽  
Nox Adsorber ◽  
Reduction Of Nox ◽  
The Rich ◽  
Three Way Catalyst

The lean burn technology has been paid attention recently by more and more people because the economics and emission of the gasoline engine can been improved extensively by lean burn technology. However, the reduction of NOx emission is quite small because of the rich oxygen. The different combination schemes of NOx adsorber and Three Way Catalyst were adopted in this paper and experiments of reduction NOx emission have been studied in an modified EFI 16 valves lean burn gasoline engine . The experiment results show that the scheme of the position of Three Way Catalyst is before the NOx adsorber Catalyst was the best scheme of reduction NOx emission in lean burn gasoline engine.

scholarly journals Research on Metal Doped Zeolite as Catalyst to Reduce NOX Emission from Lean Burn Gasoline Engines

2019 ◽  
Vol 8 (5S3) ◽  
pp. 201-206 ◽  
Keyword(s):  
Gasoline Engine ◽  
Fuel Injection ◽  
Catalytic Converter ◽  
Nox Emission ◽  
Gasoline Direct Injection ◽  
Oxidation Catalyst ◽  
Gas Temperature ◽  
Lean Burn ◽  
Exchange Method ◽  
Gasoline Engines

Lean burn gasoline direct injection (GDI) engines are the most preferred gasoline engines because of their low fuel consumption and high thermal efficiency. However, these engines produce exhaust gases that are particularly rich in oxygen and therefore the present three-way catalytic converter (TWC) is not suitable for converting the generated NOX emission into Nitrogen gases. In this present work, a new method of reducing Nitrogen Oxides emission in a gasoline engine is attempted by using an ordinary oxidation catalyst together with a deNOX(zeolite-based) catalyst. In this work, Na-form of ZSM-5 zeolite was used as a catalyst and cupric chloride (CuCl2) and ferric chloride (FeCl3) where used as transition metals. Cu-ZSM5 and Fe-ZSM5 catalyst were prepared separately in our laboratory. Na+ ion exchange method is used to prepare the catalyst. After that Cu-ZSM% and Fe- ZSM5 catalyst were washcoated separately onto the blank monoliths. Oxidation monoliths ( for oxidation of CO and HC into CO2 and H2O) were purchased directly from market. One oxidation monolith and one zeolite coated monolith were placed in a stainless steel container and canned with inlet and outlet cones ( forming catalytic convertor ). Experiments were conducted on a 2 cylinder Multi Point Port Fuel Injection engine along with a dynamometer. Exhaust emissions such as NOX, CO, HC, O2, CO2 were measured with AVL Di-gas-444 Analyzer. Exhaust gas temperature is measured with the use of a thermocouple. Firstly load tests (4, 7, 10, 13, and 16KW) were conducted on the engine without catalytic convertor was fixed close to the outlet pipe and the test were conducted again with same loading condition as mentioned above. Then by the same above procedure is followed to conduct test with Cu-ZSM5 and Fe-ZSM5 catalytic convertors. From the results it is observed that both Cu and Fe zeolite catalyst minimize emissions than the commercial catalytic converter.

scholarly journals Examination of Metal Doped Zeolite as Catalyst to Reduce NOX Emission from Lean Burn Gasoline Engines

2019 ◽  
Vol 9 (1S) ◽  
pp. 45-50
Keyword(s):  
Gasoline Engine ◽  
Fuel Injection ◽  
Catalytic Converter ◽  
Nox Emission ◽  
Gasoline Direct Injection ◽  
Oxidation Catalyst ◽  
Gas Temperature ◽  
Lean Burn ◽  
Exchange Method ◽  
Gasoline Engines

Lean burn gasoline direct injection (GDI) engines are the most preferred gasoline engines because of their low fuel consumption and high thermal efficiency. However, these engines produce exhaust gases that are particularly rich in oxygen and therefore the present three-way catalytic converter (TWC) is not suitable for converting the generated NOX emission into Nitrogen gases. In this present work, a new method of reducing Nitrogen Oxides emission in a gasoline engine is attempted by using an ordinary oxidation catalyst together with a deNOX(zeolite-based) catalyst. In this work, Na-form of ZSM-5 zeolite was used as a catalyst and cupric chloride (CuCl2 ) and ferric chloride (FeCl3 ) where used as transition metals. Cu-ZSM5 and Fe-ZSM5 catalyst were prepared separately in our laboratory. Na+ ion exchange method is used to prepare the catalyst. After that Cu-ZSM% and Fe- ZSM5 catalyst were washcoated separately onto the blank monoliths. Oxidation monoliths ( for oxidation of CO and HC into CO2 and H2O) were purchased directly from market. One oxidation monolith and one zeolite coated monolith were placed in a stainless steel container and canned with inlet and outlet cones ( forming catalytic convertor ). Experiments were conducted on a 2 cylinder Multi Point Port Fuel Injection engine along with a dynamometer. Exhaust emissions such as NOX, CO, HC, O2 , CO2 were measured with AVL Di-gas-444 Analyzer. Exhaust gas temperature is measured with the use of a thermocouple. Firstly load tests (4, 7, 10, 13, and 16KW) were conducted on the engine without catalytic convertor was fixed close to the outlet pipe and the test were conducted again with same loading condition as mentioned above. Then by the same above procedure is followed to conduct test with Cu-ZSM5 and Fe-ZSM5 catalytic convertors. From the results it is observed that both Cu and Fe zeolite catalyst minimize emissions than the commercial catalytic converter.

Tumble Flow Measurements Using Three Different Methods and Its Effects on Fuel Economy and Emissions

2006 ◽  
Author(s):  
Myoungjin Kim ◽  
Sihun Lee ◽  
Wootae Kim
Keyword(s):  
Fuel Economy ◽  
High Performance ◽  
Gasoline Engine ◽  
Exhaust Emissions ◽  
Combustion Stability ◽  
Lean Burn ◽  
Flow Measurements ◽  
Part Load ◽  
Gasoline Engines ◽  
Dynamometer Test

In-cylinder flows such as tumble and swirl have an important role on the engine combustion efficiencies and emission formations. In particular, the tumble flow, which is dominant in-cylinder flow in current high performance gasoline engines, has an important effect on the fuel consumptions and exhaust emissions under part load conditions. Therefore, it is important to know the effect of the tumble ratio on the part load performance and optimize the tumble ratio of a gasoline engine for better fuel economy and exhaust emissions. First step in optimizing a tumble flow is to measure a tumble ratio accurately. In this research the tumble flow was measured, compared and correlated using three different measurement methods: steady flow rig, 2-Dimensional PIV, and 3-Dimensional PTV. Engine dynamometer test was performed to find out the effect of the tumble ratio on the part load performance. Dynamometer test results of high tumble ratio engine showed faster combustion speed, retarded MBT timing, higher exhaust emissions, and a better lean burn combustion stability. Lean limit of the baseline engine was expanded from A/F=18:1 to A/F=21:1 by increasing a tumble ratio using MTV.

Optimization of Mode Switching Timing Control for a Lean-Burn Gasoline Engine With a Prototype Passive SCR System

2018 ◽  
Author(s):  
Dakota Strange ◽  
Pingen Chen ◽  
Vitaly Y. Prikhodko ◽  
James E. Parks
Keyword(s):  
Gasoline Engine ◽  
Nox Reduction ◽  
Cost Effective ◽  
Nox Storage ◽  
Mode Switching ◽  
Timing Control ◽  
Lean Burn ◽  
Gasoline Engines ◽  
Effective Manner ◽  
Passive Scr

Passive selective catalytic reduction (SCR) has emerged as a promising NOx reduction technology for highly-efficient lean-burn gasoline engines to meet stringent NOx emission regulation in a cost-effective manner. In this study, a prototype passive SCR which includes an upstream three-way catalyst (TWC) with added NOx storage component, and a downstream urealess SCR catalyst, was investigated. Engine experiments were conducted to investigate and quantify the dynamic NOx storage/release behaviors as well as dynamic NH3 generation behavior on the new TWC with added NOx storage component. Then, the lean/rich mode-switching timing control was optimized to minimize the fuel penalty associated with passive SCR operation. Simulation results show that, compared to the baseline mode-switching timing control, the optimized control can reduce the passive SCR-related fuel penalty by 6.7%. Such an optimized mode-switching timing control strategy is rather instrumental in realizing significant fuel efficiency benefits for lean-burn gasoline engines coupled with cost-effective passive SCR systems.

Ethanol Lean Combustion Characteristics of a GDI Engine

2015 ◽  
Vol 798 ◽  
pp. 219-223
Author(s):  
Roberto B.R. Costa ◽  
Carlos A.J. Gomes ◽  
Fabricio J.P. Pujatti ◽  
Ramon Molina Valle ◽  
José E.M. Barros
Keyword(s):  
Engine Speed ◽  
Injection Pressure ◽  
Combustion Stability ◽  
Lean Burn ◽  
Engine Efficiency ◽  
Lean Combustion ◽  
Excess Air ◽  
Wide Range ◽  
Ethanol Combustion ◽  
Gdi Engine

In the present study, ethanol combustion analysis was carried in a wall guided type GDI engine, to achieve combustion stability under lean burn operation and to expand the flammability limit for increasing engine efficiency. Tests were performed at constant engine speed, load and injection pressure (1000 rpm, NIMEP = 3 bar, 100 bar), for a wide range of injection, ignition and mixture formation parameters. NISFC, combustion stability, PMEP and burn duration were evaluated at each excess air ratio. An improvement on fuel economy and, consequently, increased engine efficiency was achieved for excess air ratios of λ = 1.1 and λ = 1.2.

Performance Investigation of an Eight Cylinder Gasoline Engine

2014 ◽  
Author(s):  
Ali Kilicarslan ◽  
Mohamad S. Qatu
Keyword(s):  
Experimental Work ◽  
Engine Speed ◽  
Gasoline Engine ◽  
Mechanical Efficiency ◽  
Effective Pressure ◽  
Air Mass ◽  
Engine Torque ◽  
Gasoline Engines ◽  
Temperature And Pressure ◽  
Engine Power

Performance investigation of a Chevrolet 5.7, eight cylinder gasoline engine is experimentally carried out at laboratuary conditions by means of the special softwares called “NetDyn” and “WinDyn”. This experimental work is intended to make contribution to the researchers that experimentally analyze the parameters of gasoline engines with the engine speed in detail. During the experiments, the engine speed is changed from 2500 rpm to 5250 rpm with 250 rpm intervals and steptime for succesive speeds is kept constant as 10 s. Engine power, engine torque, fuel and air flowrates per kW, mechanical efficiency, oil temperature and pressure, break mean effective pressure and exhaust temperatures are measured as a function of engine speed. As the engine speed was increased, it was observed that the air mass flow rate, exhaust and oil temperatures increased while the break mean effective pressure, mechanical volumetric efficiency, and engine torque decreased. Engine power increased between the engine speeds of 2500 rpm and 3750, but it decreased between the speeds of 3750 rpm 5246 rpm.

Analysis of the Relationship Between Mean Indicated Torque and Its Waveform for Modern Common Rail Diesel and Gasoline Engines

2008 ◽  
Author(s):  
Fabrizio Ponti ◽  
Matteo Rinaldi
Keyword(s):  
Engine Speed ◽  
Gasoline Engine ◽  
Management Strategies ◽  
System Model ◽  
Gasoline Engines ◽  
Torque Estimation ◽  
Speed Fluctuation ◽  
Harmonic Components ◽  
Speed Fluctuations ◽  
The Relationship

The paper presents the progresses made for the development of a methodology useful for torque estimation, necessary in modern management strategies in order to obtain an indication of the torque produced by the engine. The model developed allows estimating mean indicated torque, cylinder by cylinder, based on instantaneous engine speed fluctuations. The speed signal is picked up directly from the sensor facing the toothed wheel mounted on the engine for control purposes. The engine speed fluctuation amplitudes depend in fact on the combustion and the amount of torque that is being delivered by each cylinder. It is easy to understand therefore how these two quantities, engine speed fluctuation amplitudes and torque production, are strictly connected. The presented methodology is based on two main steps. The first step relies on the identification of the dynamic system model that allows to get torque harmonic from the corresponding engine speed components. The identification could be done by two methods, the first one requiring the knowledge of the value of the reciprocating masses with high precision, and the other one making use of different tests at the same speed but with different loads, in order to estimate separately both the reciprocating masses and the system model. The second step, which constitutes the main focus of this paper, relies on the identification of the relationship between the mean indicated torque and its harmonics. The study of this relationship has been carried out in particular in this paper for a multijet diesel engine and for a gasoline engine. Many tests were performed on different driveline configuration, both in a test-cell, and on-board. Once indicated torque and its harmonic components have been evaluated from in-cylinder pressure signals, identification of the relationship has been possible. Influence of the type of combustion performed has been discussed, as also the effects related to cylinder filling and injection timings.

NOx Emission Aftertreatment Study on Lean Burn Gasoline Engine Using Adsorber Reduction Catalyst

2007 ◽  
Author(s):  
Zhijun Li ◽  
Zhengmao Ye ◽  
Habib Mohamadian ◽  
Ying Zhang ◽  
Xiaoming Sun ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
Nox Emission ◽  
Lean Burn
Sign in / Sign up

Export Citation Format

Share Document