Horst Harndorf

Particle emissions from a marine engine: chemical composition and aromatic emission profiles under various operating conditions.

The chemical composition of particulate matter (PM) emissions from a medium-speed four-stroke marine engine, operated on both heavy fuel oil (HFO) and distillate fuel (DF), was studied under various operating conditions. PM emission factors for organic matter, elemental carbon (soot), inorganic species and a variety of organic compounds were determined. In addition, the molecular composition of aromatic organic matter was analyzed using a novel coupling of a thermal-optical carbon analyzer with a resonance-enhanced multiphoton ionization (REMPI) mass spectrometer. The polycyclic aromatic hydrocarbons (PAHs) were predominantly present in an alkylated form, and the composition of the aromatic organic matter in emissions clearly resembled that of fuel. The emissions of species known to be hazardous to health (PAH, Oxy-PAH, N-PAH, transition metals) were significantly higher from HFO than from DF operation, at all engine loads. In contrast, DF usage generated higher elemental carbon emissions than HFO at typical load points (50% and 75%) for marine operation. Thus, according to this study, the sulfur emission regulations that force the usage of low-sulfur distillate fuels will also substantially decrease the emissions of currently unregulated hazardous species. However, the emissions of soot may even increase if the fuel injection system is optimized for HFO operation.

Particulate Matter from Both Heavy Fuel Oil and Diesel Fuel Shipping Emissions Show Strong Biological Effects on Human Lung Cells at Realistic and Comparable In Vitro Exposure Conditions

Background Ship engine emissions are important with regard to lung and cardiovascular diseases especially in coastal regions worldwide. Known cellular responses to combustion particles include oxidative stress and inflammatory signalling. Objectives To provide a molecular link between the chemical and physical characteristics of ship emission particles and the cellular responses they elicit and to identify potentially harmful fractions in shipping emission aerosols. Methods Through an air-liquid interface exposure system, we exposed human lung cells under realistic in vitro conditions to exhaust fumes from a ship engine running on either common heavy fuel oil (HFO) or cleaner-burning diesel fuel (DF). Advanced chemical analyses of the exhaust aerosols were combined with transcriptional, proteomic and metabolomic profiling including isotope labelling methods to characterise the lung cell responses. Results The HFO emissions contained high concentrations of toxic compounds such as metals and polycyclic aromatic hydrocarbon, and were higher in particle mass. These compounds were lower in DF emissions, which in turn had higher concentrations of elemental carbon (“soot”). Common cellular reactions included cellular stress responses and endocytosis. Reactions to HFO emissions were dominated by oxidative stress and inflammatory responses, whereas DF emissions induced generally a broader biological response than HFO emissions and affected essential cellular pathways such as energy metabolism, protein synthesis, and chromatin modification. Conclusions Despite a lower content of known toxic compounds, combustion particles from the clean shipping fuel DF influenced several essential pathways of lung cell metabolism more strongly than particles from the unrefined fuel HFO. This might be attributable to a higher soot content in DF. Thus the role of diesel soot, which is a known carcinogen in acute air pollution-induced health effects should be further investigated. For the use of HFO and DF we recommend a reduction of carbonaceous soot in the ship emissions by implementation of filtration devices.

Metabolic Profiling as Well as Stable Isotope Assisted Metabolic and Proteomic Analysis of RAW 264.7 Macrophages Exposed to Ship Engine Aerosol Emissions: Different Effects of Heavy Fuel Oil and Refined Diesel Fuel.

Exposure to air pollution resulting from fossil fuel combustion has been linked to multiple short-term and long term health effects. In a previous study, exposure of lung epithelial cells to engine exhaust from heavy fuel oil (HFO) and diesel fuel (DF), two of the main fuels used in marine engines, led to an increased regulation of several pathways associated with adverse cellular effects, including pro-inflammatory pathways. In addition, DF exhaust exposure was shown to have a wider response on multiple cellular regulatory levels compared to HFO emissions, suggesting a potentially higher toxicity of DF emissions over HFO. In order to further understand these effects, as well as to validate these findings in another cell line, we investigated macrophages under the same conditions as a more inflammation-relevant model. An air-liquid interface aerosol exposure system was used to provide a more biologically relevant exposure system compared to submerged experiments, with cells exposed to either the complete aerosol (particle and gas phase), or the gas phase only (with particles filtered out). Data from cytotoxicity assays were integrated with metabolomics and proteomics analyses, including stable isotope-assisted metabolomics, in order to uncover pathways affected by combustion aerosol exposure in macrophages. Through this approach, we determined differing phenotypic effects associated with the different components of aerosol. The particle phase of diluted combustion aerosols was found to induce increased cell death in macrophages, while the gas phase was found more to affect the metabolic profile. In particular, a higher cytotoxicity of DF aerosol emission was observed in relation to the HFO aerosol. Furthermore, macrophage exposure to the gas phase of HFO leads to an induction of a pro-inflammatory metabolic and proteomic phenotype. These results validate the effects found in lung epithelial cells, confirming the role of inflammation and cellular stress in the response to combustion aerosols.

Needle trap sampling thermal-desorption resonance enhanced multiphoton ionization time-of-flight mass spectrometry for analysis of marine diesel engine exhaust

The aim of this publication is to present the results of the ship diesel engine measurement campaign in Rostock. A single-cylinder diesel research engine was operated on different engine loads and two different fuel types – diesel fuel (DF, diesel DIN-EN 590) and heavy fuel oil (HFO 180). The gaseous phase was directly trapped on needle trap devices (NTDs), thermal desorbed in a GC inlet and analyzed by resonance enhanced multiphoton ionization time-of-flight mass spectrometry (REMPI-TOFMS). The photoionization was realized using two different wavelengths – 266 nm and 248 nm. With REMPI mainly aromatic substances are softly ionized, thus, especially aromatics and polycyclic aromatic hydrocarbons (PAH) were found in gaseous samples of exhaust. Differences between the two fuel qualities are obviously visible. While DF exhaust contains smaller molecules (mass-to-charge ratio between 75 and 220) higher molecular substances (up to m/z 280) were found in exhaust of HFO. For example, benzene and its methylated derivatives were detected only in the diesel exhaust. Phenanthrene and alkylphenanthrenes are the major compounds resulting from combustion of heavy fuel oil. For confirmation of measured substances in exhaust the modified gas chromatographic device was complemented by a GC column.

Motorprozessverhalten und Abgasemissionen alternativer Kraftstoffe im Vergleich mit Dieselkraftstoff

Vor dem Hintergrund einer verstarkten Diskussion um Treibhausgasemissionen und endlicher fossiler Energieressourcen beschreibt der folgende Beitrag der Universitat Rostock mogliche Potenziale moderner Diesel motoren mit Direkteinspritzung bei Einsatz von alternativen Kraftstoffen der ersten und zweiten Generation. Im Fokus herausfordernder Emissionsziele wird der Schwerpunkt hierbei auf die Abgasemissionen, speziell auf vergleichende Mutagenitatsunter suchungen der organisch loslichen Partikelfraktion gelegt.

Potential of synthetic diesel fuels

The properties of synthetically manufactured fuels can be used to implement ultra low emission concepts. Within this context, Robert Bosch Research carried out a potential analysis with various synthetic diesel fuels under transient and steady-state operating conditions (vehicle, full-size and single- cylinder engine). The following article discusses special features of the combustion process and prospects for reducing critical exhaust emission components in greater detail.

A Robust Model Predictive Control using a feedforward structure for a hybrid hydraulic piezo actuator in camless internal combustion engines

This paper deals with a hybrid actuator composed by a piezo and a hydraulic part and with a Robust Model Predictive Control (RMPC) structure combined with a feedforward control in camless engine motor applications. A combination between a feedforward control based on an inversion of the system and an MPC structure is considered. The idea of the conception of the proposed new actuator is to use the advantages of both, the high precision of the piezo and the force of the hydraulic part. In fact, piezoelectric actuators (PEAs) are commonly used for precision positionings, despite PEAs present nonlinearities, such as hysteresis, saturations, and creep. In the control problem such nonlinearities must be taken into account. In this paper the Preisach dynamic model with the above mentioned nonlinearities is considered together with a feedforward control combined with a RMPC. Simulations of the implementation with real data are shown.

Development and investigation of a gas engine for agricultural machinery

In addition to efficiency and greenhouse gas reduction potential, natural gas in terms of pollutant emissions offers significant advantages compared to diesel and gasoline fuel (Figure 1). Through the gaseous state, natural gas makes possible a very homogeneous mixing with the combustion air, resulting in a nearly soot free combustion. Also the emissions of ozone-forming nitrogen oxide emissions (NOX) and non-methane hydrocarbons (NMHC) can be reduced significantly through the use of a gas motor.

Analysis of field-aged and artificially aged SCR catalysts for model development

Regarding the entire drive train using a combustion engine today is close-coupled to an exhaust gas aftertreatment (EAT) system. Only by using an efficient EAT concept it is possible to attain highest conversion rates and fulfill the emission limits. In doing so it is not only necessary to match the limits for type approval and initial operation but also to guarantee compliance over the engines life time cycle.

Anwendungsorientierte Modelle zur Berechnung von Diesel-Sprays

Auf Basis experimenteller Untersuchungen an einer Hochdruck-Hochtemperatur Einspritz- kammer mit unterschiedlichen Spritzlochgeometrien wurden empirische Modelle zur Vorhersage der Strahleindringtiefe und des Spray-Kegelwinkels abgeleitet. Wahrend klassische Modelle oftmals auf Basis konventioneller Dusenhalterkombinationen mit zylindrischen Spritzlochern entwickelt wurden, erlauben die neu erstellten Modelle die Berucksichtigung injektorspezifischer Verhaltensweisen und moderner Spritzlochgeometrien. Um eine gute Anwendbarkeit der Modelle zu gewahrleisten, wurde in der Modellentwicklung Wert darauf gelegt, moglichst leicht zugangliche Injektorparameter als Eingangsgrosen fur die Berechnungen zu verwenden. Neben der Moglichkeit zur Berechnung der Eindringtiefe und des Kegelwinkels sind weitere Modelle zur Abschatzung des Verdampfungsverhaltens im Spray und des Durchflussbeiwertes von Dusen entwickelt und in ein Programmtool implementiert worden. Die Modelle sollen Verbrennungsentwickler bei der Dusenauslegung und der Interpretation von Motormessdaten unterstutzen.