Download or read book Impact of Particulate Matter Composition on Catalyzed Diesel Particulate Filter Filtration and Regeneration on a Steady State Research Diesel Engine written by Matthew Bohm and published by . This book was released on 2005 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Particulate Matter and Exhaust Gas Composition on Diesel Particulate Filter Regenration written by Amy E. Fischer and published by . This book was released on 2009 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Filtration and Regeneration Mechanisms in Diesel Particulate Filters Influence on Filter Performance written by Niklas M. Schmidt and published by . This book was released on 2006 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Particle Filter Retrofit for All Diesel Engines written by Andreas Mayer and published by expert verlag. This book was released on 2008 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Filtration Velocities and Particulate Matter Characteristics on Diesel Particulate Filter Wall Loading Performance written by Ekathai Wirojsakunchai and published by . This book was released on 2008 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diesel Particulate Filter Technology written by Timothy V Johnson and published by SAE International. This book was released on 2007-03-28 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until recently, the complexity of the Diesel Particulate Filter (DPF) system has hindered its commercial success. Stringent regulations of diesel emissions has lead to advancements in this technology, therefore mainstreaming the use of DPFs in light- and heavy-duty diesel filtration applications. This book covers the latest and most important research in DPF systems, focusing mainly on the advancements of the years 2002-2006. Editor Timothy V. Johnson selected the top 29 SAE papers covering the most significant research in this technology.

Download or read book Influence of Engine Operating Condition and Aftertreatment Component Selection on Diesel Particulate Filter Operation written by Eric L. Schroeder and published by . This book was released on 2006 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Lubricant Derived Ash on the Catalytic Activity of Diesel Particulate Filters written by Timothy Quinn Murray and published by . This book was released on 2014 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: A diesel particulate filter (DPF) is an aftertreatment device used to remove hazardous particulate matter (PM) from diesel engine exhaust. Modem emission restrictions have limited the acceptable amount of PM output by diesel engines to the extent that a filtration strategy, such as the use of a DPF, is necessary. Diesel PM is comprised primarily by black carbon soot. Once trapped in the filter, the soot can be oxidized into CO2 and pass out of the exhaust system during what is referred to as regeneration. Metallic lubricant additive derived compounds, which make up a small fraction of PM, cannot be oxidized and remain inside the DPF until regular maintenance calls for the removal and cleaning of the filter. The buildup of ash increases the pressure drop across the filter, resulting in a direct fuel penalty to the engine. The oxidation of soot can be carried out actively at high temperatures or passively at low temperatures with the aid of a catalyst. Active regeneration requires more energy than passive regeneration because the stream of exhaust gas must be heated to a higher temperature. However, catalysts are expensive, and therefore there is a significant additional capital cost associated with catalyzed filters. The purpose of this research was to investigate the impact of ash accumulation on the catalytic activity of DPFs. The impact was measured experimentally by comparing the ability of two ash loaded DPF samples to promote several chemical reactions (most importantly soot oxidation) to the ability of a previously unused (clean) filter. It was shown that ash accumulation results in a loss in the catalytic activity of a DPF, as evidenced by a reduced capacity to generate NO2, and promote the catalyzed passive oxidation of soot. Reduced soot oxidation performance will result in faster accumulation of soot, which increases the pressure drop across the filter and necessitates more frequent regenerations. Both of these results will negatively impact fuel economy.

Download or read book Passive Regeneration written by Michael James Bahr (Nav. E.) and published by . This book was released on 2013 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diesel particulate filters (DPF) have seen widespread growth as an effective means for meeting increasingly rigorous particle emissions regulations. There is growing interest to exploit passive regeneration of DPFs to reduce fuel consumption accompanying traditional active regeneration. Incombustible material or ash, mainly derived from metallic additives in the engine lubricant, accumulates in the DPF over time. This ash accumulation increases flow restriction and rise in pressure drop across the DPF. The growth of pressure drop adversely impacts engine performance and fuel economy. This study built upon previous research to evaluate the different effects of regeneration strategy on ash packing and distribution within DPFs. Since passive regeneration relies on a catalyzed reaction, the interactions of ash with the catalyst will play an important role. Passive regeneration is specifically dependent on exhaust feed gas composition, exhaust conditions including temperature and flow rate, catalyst type and configuration, and the state of DPF loading during prior to passive regeneration. The goal of the study is to address the long-term effects of regeneration parameters on ash accumulations and the resulting impact of ash on the DPF catalyst performance. Experiments were conducted that focused on pressure drop measurements over the lifetime of diesel particulate filters with different regeneration methods coupled with post mortem ash characterization. These experiments provide insight to how these regeneration methods impact the DPF performance. These results, among few fundamental data of this kind, correlate changes in diesel particulate filter performance with exhaust conditions, regeneration strategy, and ash morphological characteristics. Outcomes are useful in optimizing the design of the combined engine-aftertreatment- lubricant system for future diesel engines, balancing the necessities of additives for adequate engine protection with the requirements for robust aftertreatment systems.

Download or read book Modeling and Analysis of Particulate Matter Deposition and Regeneration in a Diesel Particulate Filter written by Mengting Yu and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Diesel engines are widely used because of their high efficiency and low “greenhouse gas” emission. The particulate matter (PM) emitted by a diesel engine is collected and then burned in a diesel particulate filter (DPF). Analysis and modeling works have been done in this research to provide insight on optimization of the DPF design and operating conditions to achieve low pressure drop across the filter to decrease fuel consumption and low peak temperature during regeneration to avoid filter melting, cracking, and/or catalyst deactivation. Limiting models of the 1-D two-channel DPF model are analyzed. Analytical predictions and physical insight on the filtration velocity, pressure drop, heat transfer, light-off and regeneration in a DPF are obtained. The hydraulic analysis enables an efficient optimization of the DPF that lead to a more uniform PM deposition profile and a decrease of the pressure drop. The heat transfer, light-off and regeneration analysis enable estimations of the DPF heat-up time, the speed and width of the temperature front, the light-off temperature and time, and the peak regeneration temperature. New DPF regeneration procedures are proposed to limit the maximum local temperature rise. In various cases a DPF is connected by a wide-angled cone (diffuser) to the engine exhaust pipe. A 2-D axisymmetric PM deposition and regeneration model is developed to investigate the impact of the inlet cone on the deposition rate and the regeneration temperature as well as on the transient inlet velocity distribution among the various DPF channels. The highest regeneration temperature and thermal stress when using an inlet cone may be quite higher than when it is absent. A major technological challenge in the regeneration of the ceramic cordierite filter is that a sudden decrease of the engine load, referred to as Drop to Idle (DTI), may create a transient temperature peak much higher than under either the initial or final stationary feed conditions. This excessive transient temperature rise may cause local melting or cracking of the ceramic filter. Suggestions on how to limit the peak temperature rise following a DTI are provided through numerous simulations of the 1-D and 2-D DPF regeneration models.

Download or read book Evaluation of Catalyzed Diesel Particulate Filters Used in an Underground Metal Mine written by John J. Baz-Dresch and published by . This book was released on 1993 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AN EXPERIMENTAL INVESTIGATION INTO THE EFFECT OF NO2 AND TEMPERATURE ON THE PASSIVE OXIDATION AND ACTIVE REGENERATION OF PARTICULATE MATTER IN A DIESEL PARTICULATE FILTER written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : In this study the oxidation of particulate matter (PM) retained in a catalyzed particulate filter (CPF) is investigated to understand the kinetics of PM oxidation. Seven passive oxidation and four active regeneration experiments were performed on a Cummins ISB 2013 280 hp engine and the production aftertreatment system adapted to a lab setup, in order to study the NO2 assisted and thermal oxidation of the PM retained in the CPF. The CPF was loaded with PM produced by the engine and the PM was then oxidized in the CPF under various Passive Oxidation (PO) and Active Regeneration (AR) conditions. First, the engine was operated at an engine condition that produced PM at a greater rate than the production setting, in order to load the CPF to 3.0±0.4 g/L in a suitable time of 6 hours. To study the NO2 assisted oxidation, exhaust at pre-determined engine conditions with low PM concentration (2 concentration and temperature was flowed through the CPF. During the PO testing, the exhaust temperature into the CPF varied from 299 - 385°C, the NO2 concentration varied between 137 - 1013 ppm and the exhaust mass flowrate varied between 3.63 - 12.0 kg/min. Thermal oxidation was studied by operating the engine at a specific condition where the exhaust at the Diesel Oxidation Catalyst (DOC) inlet was at a higher temperature than the light-off temperature of hydrocarbon oxidation in the DOC (300 °C). Late combustion cycle fuel dosing was performed and the hydrocarbons in the dosed fuel were oxidized across the DOC. This created an exotherm and raised the exhaust temperature into the CPF to the required value between 498 - 575°C to oxidize the PM retained in the CPF at the end of loading, by reaction with O2. The O2 concentration into the CPF varied between 8.17 to 9.03%. It was found that the NO2 assisted kinetics could be represented using the standard Arrhenius equation. The activation energy obtained using the standard Arrhenius model, is 94 kJ/gmol and the pre-exponential factor obtained is 25.5 1/ppm/s. The thermal oxidation reaction rate could be similarly represented using the O2 concentration and temperature over the range of conditions studied. The activation energy for thermal oxidation was found to be 136 kJ/gmol and the pre-exponential factor obtained is 3.56 1/ppm/s. It was found that for two of the passive oxidation tests, the reaction rates were higher than that predicted using the Arrhenius representation. The Loading Engine Condition also showed higher reaction kinetics than the NO2assisted kinetics. The engine and exhaust conditions as well as reaction rates obtained as part of this study are intended to be compared to the corresponding values obtained for a SCR-in-DPF substrate that is currently being studied at Michigan Tech as the next phase of study. The purpose of this comparison is to understand the difference in performance of both aftertreatment systems in light of their respective weights and volumes. The data obtained during this study is also being used to calibrate the 1-D CPF model at MTU. An introduction to the model is provided in this thesis, and the important variables of the study that are also used for model calibration are presented in the appropriate sections.

Download or read book Critical Topics in Exhaust Gas Aftertreatment written by Peter Eastwood and published by . This book was released on 2000 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topics most critical to exhaust gas aftertreatment are described in depth: the problems which need to be overcome, and the possible solutions currently under investigation. After treatment is covered as an emissions subject in its own right; and all components of the entire system are included, not just catalysts. Highly technical issues are presented in a way that makes them readily accessible to the non-specialist. It Includes 700 references.

Download or read book Reducing Particulate Emissions in Gasoline Engines written by Thorsten Boger and published by SAE International. This book was released on 2018-11-28 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: For years, diesel engines have been the focus of particulate matter emission reductions. Now, however, modern diesel engines emit less particles than a comparable gasoline engine. This transformation necessitates an introduction of particulate reduction strategies for the gasoline-powered vehicle. Many strategies can be leveraged from diesel engines, but new combustion and engine control technologies will be needed to meet the latest gasoline regulations across the globe. Particulate reduction is a critical health concern in addition to the regulatory requirements. This is a vital issue with real-world implications. Reducing Particulate Emissions in Gasoline Engines encompasses the current strategies and technologies used to reduce particulates to meet regulatory requirements and curtail health hazards - reviewing principles and applications of these techniques. Highlights and features in the book include: Gasoline particulate filter design, function and applications Coated and uncoated three way catalyst design and integration Measurement of gasoline particulate matter emission, both laboratory and PEMS The goal is to provide a comprehensive assessment of gasoline particulate emission control to meet regulatory and health requirements - appealing to calibration, development and testing engineers alike.

Download or read book A Study of the Effects of Fuel Sulfur on a Catalyzed Diesel Particulate Filter for Controlling Emissions from a Heavy duty Diesel Engine with EGR written by Rama Chandra S. Nandiraju and published by . This book was released on 2001 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Implications of Low Particulate Matter Emissions on System Fuel Efficiency for High Efficiency Clean Combustion written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced diesel combustion regimes such as High Efficiency Clean Combustion (HECC) offer the benefits of reduced engine out NOX and particulate matter (PM) emissions. Lower PM emissions during advanced combustion reduce the demand on diesel particulate filters (DPFs) and can, thereby, reduce the fuel penalty associated with DPF regeneration. In this study, a SiC DPF was loaded and regenerated on a 1.7-liter 4-cylinder diesel engine operated in conventional and advanced combustion modes at different speed and load conditions. A diesel oxidation catalyst (DOC) and a lean NOX trap (LNT) were also installed in the exhaust stream. Five steady-state speed and load conditions were weighted to estimate Federal Test Procedure (FTP) fuel efficiency. The DPF was loaded using lean-rich cycling with frequencies that resulted in similar levels of NOX emissions downstream of the LNT. The pressure drop across the DPF was measured at a standard point (1500 rpm, 5.0 bar) before and after loading, and a P rise rate was determined for comparison between conventional and advanced combustion modes. Higher PM emissions in conventional combustion resulted in a higher rate of backpressure rise across the DPF at all of the load points leading to more frequent DPF regenerations and higher fuel penalty. The fuel penalty during conventional combustion was 4.2% compared with 3.1% for a mixture of conventional and advanced modes.

Download or read book Diesel Particulate Emissions Landmark Research 1994 2001 written by John H Johnson and published by SAE International. This book was released on 2002-02-20 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for manufacturers to meet U.S. Environmental Protection Agency (EPA) mobile source diesel emissions standards for on-highway light duty and heavy duty vehicles has been the driving force for the control of diesel particulate and NOx emissions reductions. Diesel Particulate Emissions: Landmark Research 1994-2001 contains the latest research and development findings that will help guide engineers to achieve low particulate emissions from future engines. Based on extensive SAE literature from the past seven years, the 45 papers in this book have been selected from the SAE Transactions Journals.