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38 results on '"Thorwarth, Harald"'

14. Schadstoffe in Altholz.

Author

Thorwarth, Harald, Endriss, Felix, and Scheuber, Matthias

Subjects
*CIRCULAR economy, *POLLUTANTS
Abstract

Occasionally, it is assumed that wood can be fed into an endless usage cascade. This assumption is investigated based on data from new and used chipboards, as well as waste wood of category AI–AIII. The results show, based on 468 data sets, that pollutant concentrations in waste wood vary over a wide range. Depending on the sample group, 46 % to 69 % of the samples examined would not be suitable for material use according to the applicable Waste Wood Ordinance. It must be assumed that waste wood already contains pollutants in relevant concentrations after a single use and can therefore only be fed into the material cycle a second time after the results of an analytical examination are available. An organoleptic examination is not sufficient for this purpose. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Entwicklung von Gewebefiltern für Holzfeuerungsanlagen mit Ultraschall- und Jet-Pulse-Abreinigung

Author

Baumgarten, Björn, Thorwarth, Harald, Schott, Fabian, Straub, Dieter, Vogt, Ulrich, and Baumbach, Günter

Subjects
Emissionsminderung, Holzfeuerung, Partikelemissionen, Jet-Pulse-Abreinigung, Ultraschall-Abreinigung, Gewebefilter
Abstract

Biomasse ist im deutschen Wärmemarkt der mit Abstand wichtigste erneuerbare Energieträger. Im Gegensatz zu den fossile Energieträgern ist Holz CO2-neutral. Bei dem Verbrennungsprozess entstehen unterschiedliche Schadstoffe: Feinstaub, NOx, CO und polyzyklische aromatische Kohlenwasserstoffe (PAK). Insbesondere Feinstaub wird kontrovers diskutiert, ohne Filtertechnologien sind heutige und zukünftige Grenzwerte schwer einzuhalten Für Kleinfeuerungsanlagen existiert eine Marktlücke hinsichtlich der Abgasreinigung. In diesem Projekt soll ein kostengünstiger Staubabscheider entwickelt werden. Dabei werden zwei Filterregenerationsmethoden - die Jet-Pulse-Methode und eine neuartige Methode - untersucht

Published
2023
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18. Künstliche Intelligenz. Ein theoretisches Werkzeug zur praxisorientierten Konzeption

Author

Ifland, Sebastian, Buck, Christoph, Eymann, Torsten, Stähle, Philipp, Thorwarth, Harald, and Publica

Abstract

Künstliche Intelligenz (KI) spielt in der Digitalisierung von Unternehmen eine zentrale Rolle. Um das Verständnis dieser Technologie zu fördern, wird in diesem Artikel der Unterschied zwischen KI-Systemen und KI-Applikationen erläutert. Anschließend dient ein deutscher Energiekonzern als Fallbeispiel für den konzeptionellen Einsatz von KI. Es werden theoretische Methoden beschrieben und angewendet, mithilfe welcher der Einsatz von KI im Unternehmen sinnvoll konzeptioniert werden kann.

Published
2022

27. Role of biogenic Fe(III) minerals as a sink and carrier of heavy metals in the Rio Tinto, Spain

Author

Abramov, Sergey M., primary, Tejada, Julian, additional, Grimm, Lars, additional, Schädler, Franziska, additional, Bulaev, Aleksandr, additional, Tomaszewski, Elizabeth J., additional, Byrne, James M., additional, Straub, Daniel, additional, Thorwarth, Harald, additional, Amils, Ricardo, additional, Kleindienst, Sara, additional, and Kappler, Andreas, additional

Published
2020
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30. Online Water Content Determination in Wood Chips Using a Microwave Sensor.

Author

Endriss, Felix, Saur, Gerrit, and Thorwarth, Harald

Subjects
*FUELWOOD, *INTERNET content, *FUEL quality, *BIOMASS energy, *MICROWAVES, *WOOD chips
Abstract

The water content is an essential parameter for assessing the quality of solid biofuels. In terms of economic, technical and environmental aspects a continuous determination of the solid fuel water content is sought. This article investigates the use of microwave technology for the continuous measurement of fuel water content. For this purpose, a microwave sensor was evaluated with five different types of wood chips (forest residues, beech, pine, and ash). The results of the online measurements showed a strong correlation with the reference method r < 0.9 for most materials. This means that continuous water content determination of wood fuels using microwave technology is fundamentally possible. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Impact of Chimney‐draught Conditions on Combustion and Emission Behavior of a Wood‐burning Stove.

Author

Endriss, Felix, Grammer, Peter, Russ, Michael, and Thorwarth, Harald

Subjects
WOOD stoves, COMBUSTION, WASTE gases, THERMAL efficiency, AIRDROP, TEMPERATURE effect
Abstract

Pollutants from combustion in wood‐burning stoves are influenced by many factors, including the exhaust gas system. This is responsible for the air supply due to the draught generated. Contrary to results reported in literature the experiments in this study show no effect on temperature related to increasing air supply and a total dust decreasing at higher draughts. The results also show no significant impact of the draught on gaseous emissions (CO/OGC/NOx). The most significant loss was determined at thermal efficiency, which lost up to 13 % absolute with increasing draught. [ABSTRACT FROM AUTHOR]

Published
2021
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37. Trace Element Behaviour in Pulverised Fuel Fired Power Plants : Impact of Fuels and Emission Control Technologies

Author

Thorwarth, Harald and Thorwarth, Harald

Abstract

Fossil as well as renewable biomass fuels contain trace elements. Those are fed to the combustion process with the fuel. During combustion they are fully or partially evaporated in the furnace. Depending on the concentration in the fuels, the individual properties of the trace elements, the flue gas composition and the applied air pollution control devices (APCDs), trace elements are emitted at the stack at different concentrations. The present work describes the trace element behaviour in pulverised fuel fired power plants. The main focus of the investigations is laid on the impact of air pollution control devices and biomass secondary fuels. Experimental investigations have been carried out at a 500KWth test facility firing different coals and the secondary fuels straw and sewage sludge. Mercury is of special interest due to its high vapour pressure. Hence, additional lab-scale investigations have been carried out studying the impact of SCR-DeNOx catalysts and metal oxides. The experiments show that trace elements can be released to the gas phase and condense on fly ash particles along the flue gas path, depending on their volatility. The use of secondary fuels influences the trace element enrichment in different ash fractions. Mercury (Hg) is the only element studied in this work that is completely evaporated during combustion. Along the flue gas path Hg adsorbs to fly ash particles, but it can be also present in the gas phase at the stack in significant concentrations. Mercury behaviour in ash filtering systems and flue gas desulphurisation plants (FGD) is also influenced by mechanisms at the SCR catalyst. The results show for different investigated catalyst elements that the NOx reduction and mercury oxidation are competing reactions. Associated to this effect, elemental mercury is desorbed from the active sites of the catalyst when ammonia is injected to start the NOx reduction mechanism. Related to the chlorine concentration, co-firing secondary fuels can improve mercury oxidation at the catalyst and can therefore improve the mercury removal in a downstream flue gas desulphurisation plant.

Published
2007

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