DOAJ (DOAJ: Directory of Open Access Journals), Apr 1, 2019
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
European Biomass Conference and Exhibition Proceedings, 2014
This work aims at identifying new potential fuels for a near future Danish CHP system encompassin... more This work aims at identifying new potential fuels for a near future Danish CHP system encompassing pretreatment of marginal biomass resources by Pyroneer gasification for subsequent conversion in existing coalfired boilers. The focus of the work is on finding and characterizing new marginal biomass resources and includes various wastes and residues from industry and agriculture (e.g. waste water sludge, manure fibers, lignin residues etc.). The technical assessment is conducted by comparing the results from a series of physicalmechanical and thermochemical experiments to a set of wellknown references. This assessment is supplemented by an overall evaluation of several practical issues. The results from the work will be used to build a catalogue of potential new marginal fuels for Pyroneer gasification systems. From this catalogue, promising candidates can be selected for detailed analysis.
It seems that the severity of the global challenges associated to anthropogenic pollution and res... more It seems that the severity of the global challenges associated to anthropogenic pollution and resource use is starting to sink in. More and more people are acknowledging that our modern lifestyle has a cost, and that apparently there was a price on the free lunch after all. But it is already much too late for a quiet settlement. The services have already been delivered and it is time to pay the bill. We talk. And discuss. And while we talk we know that it will be the future generations who will actually pick up the tap. And we know that the price of the bill will increase the longer we postpone the payment. We keep talking. And produce. And consume. While we talk the piles of degraded materials (secondary resources) grow larger and the piles of essential raw materials (primary resources) grow smaller. Both piles are resources. We need to manage them better. … This study seeks to investigate and identify new ways to improve the current practice related to management of secondary resources. It is in this regard investigated how to apply low temperature thermal gasification in the beneficial utilization of secondary resources to produce non-fossil energy and recover irreplaceable and vital inorganic elements. The study has been conducted as part of the EUDP financed project "Fuel flexible, Efficient and Sustainable Low Temperature Biomass Gasification" under the work package "WP1: PYRONEER Gasification-fuel variability, Energy Efficiency and Bioash Quality". Stop talking, start reading.
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Water is of paramount importance for the energy sector. For example, thermal power plants require... more Water is of paramount importance for the energy sector. For example, thermal power plants require water for cooling. Conversely, energy is critical for the extraction of potable water and cleaning of waste water. Energy and water are indispensable for agriculture and livestock farming. As demand for resources increase due to both economic and population growth, more competition, and, in some places, scarcity may affect the security of supply across the three sectors. Climate change is likely to compound this pressure. The Energy-Water-Food Nexus concept is now seen as a key paradigm in sustainable development strategies. This approach will enhance the understanding of the complex and dynamic interrelationships between energy, water and food, and facilitate more sustainable management of these finite resources. Energy, water, and food systems are closely interlinked DTU International Energy Report 2016 Edited by Leif Sønderberg Petersen and Hans Hvidtfeldt Larsen Reviewed by Gustaf Olsson, Lund University maRkET, REGULaTIONS aND ECONOmy Nexus effects related to the market, costs and international regulations, emissions trading and implementation of emerging technologies must be analysed and included in Nexus models.
DTU Orbit (27/12/2018) Quality of pellets from torrefied biomass and pellets torrefied at differe... more DTU Orbit (27/12/2018) Quality of pellets from torrefied biomass and pellets torrefied at different temperatures Torrefaction is a mild thermal treatment in an inert atmosphere, which is known to increase the energy density of biomass on a mass basis (MJ kg-1). By combining the torrefaction process and pelletization the specific energy density on volume basis is further increased would thus allow for more cost effective volume limited transport. There are two ways of combining torrefaction and pelletization: pelletize torrefied biomass and torrefy regular pellets. The former is the one used for producing commercial torrefied pellets, while the latter one could be relevant for power plant which has facility to do torrefaction before co-firing. In this study, both ways were utilized to produce torrefied pellets. The quality of these pellets have been characterized for higher heating value (HHV), energy consumption during grinding, mechanical durability and equilibrium moisture content...
This report investigates whether or not it would be possible to produce carbon-negative energy fr... more This report investigates whether or not it would be possible to produce carbon-negative energy from pyrolysis of wheat straw in a series of Danish agricultural scenarios. A combination of process simulation in SuperPro Designer software, correlations derived from literature studies and experimental work, and overall balance calculations has been applied in the process. The study deviates from other studies of pyrolysis and biochar production by the inclusion of substitution energy impact on the overall carbon-balance. Substitution energy is integrated to account for the gap between the energy production from the pyrolysis and the full energy potential of the biomass, quantified by complete conversion in either combustion or gasification systems. It was concluded that it is feasible to produce carbon-negative energy under a variation of different settings, but also that the negative carbon-balance is only robust for the slow pyrolysis scenario. The CO2 benefit of the most carbon-nega...
DOAJ (DOAJ: Directory of Open Access Journals), Apr 1, 2019
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
European Biomass Conference and Exhibition Proceedings, 2014
This work aims at identifying new potential fuels for a near future Danish CHP system encompassin... more This work aims at identifying new potential fuels for a near future Danish CHP system encompassing pretreatment of marginal biomass resources by Pyroneer gasification for subsequent conversion in existing coalfired boilers. The focus of the work is on finding and characterizing new marginal biomass resources and includes various wastes and residues from industry and agriculture (e.g. waste water sludge, manure fibers, lignin residues etc.). The technical assessment is conducted by comparing the results from a series of physicalmechanical and thermochemical experiments to a set of wellknown references. This assessment is supplemented by an overall evaluation of several practical issues. The results from the work will be used to build a catalogue of potential new marginal fuels for Pyroneer gasification systems. From this catalogue, promising candidates can be selected for detailed analysis.
It seems that the severity of the global challenges associated to anthropogenic pollution and res... more It seems that the severity of the global challenges associated to anthropogenic pollution and resource use is starting to sink in. More and more people are acknowledging that our modern lifestyle has a cost, and that apparently there was a price on the free lunch after all. But it is already much too late for a quiet settlement. The services have already been delivered and it is time to pay the bill. We talk. And discuss. And while we talk we know that it will be the future generations who will actually pick up the tap. And we know that the price of the bill will increase the longer we postpone the payment. We keep talking. And produce. And consume. While we talk the piles of degraded materials (secondary resources) grow larger and the piles of essential raw materials (primary resources) grow smaller. Both piles are resources. We need to manage them better. … This study seeks to investigate and identify new ways to improve the current practice related to management of secondary resources. It is in this regard investigated how to apply low temperature thermal gasification in the beneficial utilization of secondary resources to produce non-fossil energy and recover irreplaceable and vital inorganic elements. The study has been conducted as part of the EUDP financed project "Fuel flexible, Efficient and Sustainable Low Temperature Biomass Gasification" under the work package "WP1: PYRONEER Gasification-fuel variability, Energy Efficiency and Bioash Quality". Stop talking, start reading.
Users may download and print one copy of any publication from the public portal for the purpose... more Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Water is of paramount importance for the energy sector. For example, thermal power plants require... more Water is of paramount importance for the energy sector. For example, thermal power plants require water for cooling. Conversely, energy is critical for the extraction of potable water and cleaning of waste water. Energy and water are indispensable for agriculture and livestock farming. As demand for resources increase due to both economic and population growth, more competition, and, in some places, scarcity may affect the security of supply across the three sectors. Climate change is likely to compound this pressure. The Energy-Water-Food Nexus concept is now seen as a key paradigm in sustainable development strategies. This approach will enhance the understanding of the complex and dynamic interrelationships between energy, water and food, and facilitate more sustainable management of these finite resources. Energy, water, and food systems are closely interlinked DTU International Energy Report 2016 Edited by Leif Sønderberg Petersen and Hans Hvidtfeldt Larsen Reviewed by Gustaf Olsson, Lund University maRkET, REGULaTIONS aND ECONOmy Nexus effects related to the market, costs and international regulations, emissions trading and implementation of emerging technologies must be analysed and included in Nexus models.
DTU Orbit (27/12/2018) Quality of pellets from torrefied biomass and pellets torrefied at differe... more DTU Orbit (27/12/2018) Quality of pellets from torrefied biomass and pellets torrefied at different temperatures Torrefaction is a mild thermal treatment in an inert atmosphere, which is known to increase the energy density of biomass on a mass basis (MJ kg-1). By combining the torrefaction process and pelletization the specific energy density on volume basis is further increased would thus allow for more cost effective volume limited transport. There are two ways of combining torrefaction and pelletization: pelletize torrefied biomass and torrefy regular pellets. The former is the one used for producing commercial torrefied pellets, while the latter one could be relevant for power plant which has facility to do torrefaction before co-firing. In this study, both ways were utilized to produce torrefied pellets. The quality of these pellets have been characterized for higher heating value (HHV), energy consumption during grinding, mechanical durability and equilibrium moisture content...
This report investigates whether or not it would be possible to produce carbon-negative energy fr... more This report investigates whether or not it would be possible to produce carbon-negative energy from pyrolysis of wheat straw in a series of Danish agricultural scenarios. A combination of process simulation in SuperPro Designer software, correlations derived from literature studies and experimental work, and overall balance calculations has been applied in the process. The study deviates from other studies of pyrolysis and biochar production by the inclusion of substitution energy impact on the overall carbon-balance. Substitution energy is integrated to account for the gap between the energy production from the pyrolysis and the full energy potential of the biomass, quantified by complete conversion in either combustion or gasification systems. It was concluded that it is feasible to produce carbon-negative energy under a variation of different settings, but also that the negative carbon-balance is only robust for the slow pyrolysis scenario. The CO2 benefit of the most carbon-nega...
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