DNOX with Ethanol Engines

Investigating the Potential to Obtain Low Emissions from a Diesel Engine Running on Ethanol and Equipped with EGR, Catalyst and DPF

SAE Reference No: 2004-01-1884
Dan Haupt, Kent Nord and Bror Tingvall Luleå University of Technology
Peter Ahlvik Ecotraffic ERD3
Karl-Erik Egebäck Autoemission K-E E Consultant
Sören Andersson and Micael Blomquist STT EMTEC

Experiments were performed to investigate the potential to achieve low emissions from a diesel engine fueled by ethanol and equipped with a commercially available exhaust after-treatment device, DNOx® from STT Emtec. The DNOx® system includes exhaust gas recirculation (EGR) catalysts and a continuously regenerating diesel particulate filter (DPF). Two Euro III classified 9-liter turbocharged, after-cooled diesel engines from Scania were used for the task. One engine was fueled by ethanol and the other by Swedish diesel fuel, EC1. Engine operating conditions of a 22-mode test cycle, including the 13 modes of the European Stationary Cycle (ESC cycle), were used for the tests.

The emissions of NOX and HC were small for the ethanol-fueled engine, 3.48 and 0.53 g/kWh, respectively, while the emission of CO was higher, 2.07 g/kWh. Estimations of emitted particle mass were calculated by using the software supplied in the Scanning Mobility Particle Sizer (SMPS). The estimations showed that the ethanol engine emitted only ~1/10 of the particle mass emitted by the diesel-fueled engine.

A powerful reduction of the regulated emissions was obtained when equipping the ethanol engine with EGR, catalyst and DPF. The emissions of HC, CO and NOX decreased down to 0.15, 0.04 and 2.54 g/kWh, respectively, while the estimated particle mass was reduced by 67%. Actually, by using the aftertreatment system, the engine became a Euro IV engine regarding the emissions of HC, CO and NOx. The system worked even better with the diesel-fueled engine. The NOx emission was reduced by approximately 33% and the estimated particle mass by more than 99%.

Calculations showed that the EGR ratio was higher for the diesel engine than for the ethanol engine. Consequently, by applying a higher EGR ratio for the ethanol engine an additional reduction of the NOX emissions should be obtained.

The results indicate that very low NOX and particle emissions could be obtained for an ethanol-fueled diesel engine by using the right after treatment equipment. Future studies should investigate the possibility to increase the EGR ratio further. The investigations also underline the need for development of a special particulate filter for ethanol engines.

SAE-paper in PDF-format

The following papers are published on this website with permission from SAE International. As a user of this website, you are permitted to view these papers on-line, download these pdf files and to print one copy of the papers at no cost for your use only. Downloaded pdf files and printouts of SAE papers contained on this website may not be copied, distributed or forwarded to others or for the use of others. SAE 2004-01-1884 © 2004 SAE International.
Technical Papers
En kund i Asien...
STT Emtec has performed engine tests with EGR and ethanole fuel for BioAlcohol Fuel Foundation (BAFF).
Uppfinningen avser ett förfarande och en anordning för återföring av en del av avgaserna från avgasröret hos en dieselmotor till motors inlopp.
Filter Media Consulting, Inc conference in Stuttgart, Germany: Filtration in Transportation
The engine test laboratory of Sweden based company STT Emtec has been accredited according to the internationally accepted standard for engine laboratories ISO/IEC 17025. This was confirmed by the Governmental authority Swedac, -Board for accreditation and technical control. The accreditation assures that the engine test laboratory, a core off the company's Research and Development, meets this high standard.
The County Council of Västernorrland gives every second year a company or person an award for environmental work. The Environment Award for 2005 was given to STT Emtec AB for its work involving hi-tech knowledge, the advance of technology in the interest of the environment. Read the jury`s grounds.
California Air Reosurces Board, CARB, has verified a system from the filter manufacturer Johnson Matthey, called EGRT. The system is a combination between STT Emtec's emission control system, DNOx and Johnson Matthey's CRT filter.
Anders Björk new CEO at STT Emtec from January 1, 2006.
Micael Blomquist has been appointed  Excecutive Vice President
STT Emtec announces the first order of Lean NOx exhaust reduction systems to Maruma Technica in Japan.
STT Emtec announces orders to Russia and Brazil amounting to 4 MSEK on all new developed power kits to the Mitsubishi Common Rail engine lineup
The technology of STT of Sundsvall to reduce nitrogen oxides in diesel exhausts, is now undergoing its first big test - in California. California is renowned for having the toughest regulations in the world today for exhaust emissions, and is preparing even more stringent legislation. In April this year, STT signed a co-operation agreement with the US-based Engelhard Corporation, which specialises in advanced filter technology. That company is one of the world`s biggest suppliers of catalysts and systems to reduce pollution from combustion engines. This co-operation opens up a huge market for STT.
The environmental problems of diesel are high on the agenda these days. Political measures include raising taxes on diesel to reduce its use, thereby reducing environmental problems. The STT Holding AB Group in Sundsvall has made a technological breakthrough that makes it possible to significantly reduce harmful emissions from heavy diesel vehicles. STT is aiming at a listing on the stock exchange, and some of the biggest names in Swedish industry have decided to become shareholders in the company.
New Office in USA and Key Recruitment
STT Emtec, former STT Svensk Turbo Teknik AB, has more than twenty years of experience from turbo repairs, which has led to a great confidence among customers, in Sweden as well as abroad.

Swedish technology will now be used to clean the exhaust gases from London's huge fleet of buses. STT Emtec, of Sundsvall, in collaboration with the Engelhard Corporation, an American filter manufacturer, has been commissioned to install exhaustcleaning systems in a number of London's 6,000 buses.

Sweden based STT Emtec takes another step forward in emission control for heavy and medium-duty diesel engines. The company has developed an active system for diesel particulate filters, which solves the problem with soot particulates by burning them. The system is based on catalytic combustion of diesel fuel injected into the exhaust gases.
The Swedish company STT Emtec have been commissioned to deliver their own developed exhaust gas cleaning system for approximately 1000 heavy diesel transit busses in the state of Texas.
Investigating the Potential to Obtain Low Emissions from a Diesel Engine Running on Ethanol and Equipped with EGR, Catalyst and DPF
NOx and PM Control from Heavy Duty Diesel Engines Using a Combination of Low Pressure EGR and Continuously Regenerating Diesel Particulate Filter
Low Pressure EGR Calibration Strategies for Reliable Diesel Particulate Filter Regeneration on HDD Engines
Marine DNOx will allow vessel owners to reduce NOx emissions considerably, resulting in substantial environmental benefits.
New CEO at STT Emtec from January 1, 2009
New Managing Director of STT Emtec as from Januari 28, 2011
STT Emtec AB has signed a supply agreement with the German company TWINTEC Technologies GmbH, for the supply of key components for particulate filters with active regeneration
STT Emtec contributes to a better environment at Oslo Port
The Paper Mill M-real in Husum has equipped five more terminal tractors with emission systems from STT Emtec.
More technical papers

© STT Emtec AB, Box 46, 862 02 Njurunda, Sweden    Phone +46 60 64 10 40   info@sttemtec.com

Visiting address: Njurundavägen 16, 862 40 Njurunda, Sweden. STT Emtec, engine and emission technology.