Aufbereitung von nachwachsenden Rohstoffen durch Zerkleinerung

Teipel, Ulrich; Winter, Herbert; Unkelbach, Gerd; Schweppe, Rainer; Gromov, A. A.

doi:10.1002/cite.200900004

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…Comminution of lignocellulosic biomass is a crucial step in the process of utilizing these materials for the production of biochemicals, as it (I) decreases the cellulose crystallinity, (II) increases the accessible specific surface, (III) increases the number of pores, as well as their size and (IV) reduces the mass transfer limitation during the disintegration [5,6]. Furthermore, comminution has an influence on the structure of lignin which might enhance the conversion rates of the following process [7]. It also plays a major role when these materials are used as solid biofuels for co-firing with coal or for combustion with pulverized burners [8,9].…”

Section: Introductionmentioning

confidence: 99%

Influence factors on the comminution process of wood for the production of precursors and basic chemicals for the chemical industry

Eisenlauer¹,

Teipel²

2019

Adv. Mater. Lett.

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The upstream process of comminution is a key element in the use of renewable raw materials, which impacts the consecutive disintegration of the materials. Energy efficiency of the comminuition process is therefore of utmost importance. The key factors to increase energy efficiency are, beside the mill type and the mill operation factors, the species of the renewable resource, in terms of water contend and the mechanical properties which are the dominant factors in biomass size reduction. In this study the influence of different factors on the effective specific comminution energy (ESCE) is elucidated. For theses purpose, three types of raw wood chips as well as recycled wood of two different qualities, were comminuted with a cutting mill and a swing hammer mill. The materials were comminuted at several levels of moister contend, under varied opening sizes of the internal screen of the mills. Particle size distributions of the comminuted materials were examined with sieve analyses and dynamic image analysis. Especially, the moister content directly influences the ESCE and the particle size distribution. Moreover the type of material, due to its different mechanical properties, is of significant influence on the particle size distribution and the ESCE.

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Section: Introductionmentioning

confidence: 99%

Influence factors on the comminution process of wood for the production of precursors and basic chemicals for the chemical industry

Eisenlauer¹,

Teipel²

2019

Adv. Mater. Lett.

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“…Für die Kompaktierung (Pelletierung/Brikettierung) dieser Rohstoffe hingegen wirkt sich eine breite Partikelgrößenverteilung positiv auf den Prozess aus, da die kleinen Partikel die Zwischenräume auffüllen und somit das Produkt dichter, fester und besser förderbar wird [6,7]. Möglicherweise können aber auch durch den Zerkleinerungsprozess Strukturänderungen des Lignins erzielt werden, so dass sich in den folgenden Prozessschritten der Aufbereitung der Umsatzgrad erhöhen lässt [8]. Des Weiteren ist eine gezielte Zerkleinerung für den Aufschluss vorteilhaft um: (i) die Kristallinität der Cellulose zu reduzieren, (ii) die spezifische Oberfläche der Rohstoffe zu erhöhen, (iii) die Porengröße der Partikel zu vergrößern und (iv) Partikelkollektive zu erzeugen, die sich für kontinuierliche Aufschlussverfahren eignen [2].…”

Section: Introductionunclassified

“…Des Weiteren ist eine gezielte Zerkleinerung für den Aufschluss vorteilhaft um: (i) die Kristallinität der Cellulose zu reduzieren, (ii) die spezifische Oberfläche der Rohstoffe zu erhöhen, (iii) die Porengröße der Partikel zu vergrößern und (iv) Partikelkollektive zu erzeugen, die sich für kontinuierliche Aufschlussverfahren eignen . Möglicherweise können aber auch durch den Zerkleinerungsprozess Strukturänderungen des Lignins erzielt werden, so dass sich in den folgenden Prozessschritten der Aufbereitung der Umsatzgrad erhöhen lässt .…”

Section: Introductionunclassified

Process Technology for Waste Wood Processing

Eisenlauer

Graf

Teipel

2018

Chemie Ingenieur Technik

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In den letzten Jahren hat die Nutzung nachwachsender Rohstoffe stark zugenommen. Um die Nachfrage decken zu können, müssen neue Rohstoffströme erschlossen, aber auch die Prozessschritte bei der Nutzung dieser in ihrer Effizienz gesteigert werden. Altholz bzw. Recyclingholz stellt einen bis heute wenig genutzten Rohstoffstrom dar. Ein wesentlicher Aspekt bei der Nutzung dieser Rohstoffe ist die Zerkleinerung. In dieser Arbeit wurde Recyclingholz in einer Hammerund einer Schneidmühle zerkleinert. Dabei wurde der Einfluss von Prozessparametern und des Rohstofftyps auf die Zerkleinerungsenergie und die Zerkleinerungsprodukte untersucht.In recent years the use of renewable raw materials has been gaining increasing importance. Therefore, new resource flows have to be developed and the process steps in the utilization chain need to be increased in their efficiency. Waste wood or recycled wood is still little used today. The upstream process of comminution is a key element in the usage of these materials. This work focuses on their comminution in a hammer and cutting mill. The influence of process parameters and the quality of the raw material on the comminution energy and the comminution products were investigated.

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“…Comminution of lignocellulosic biomass is a crucial step in the process of utilizing these materials for the production of biochemicals, as it (I) decreases the cellulose crystallinity, (II) increases the accessible specific surface, (III) increases the number of pores, as well as their size, and (IV) reduces the mass transfer limitation during the disintegration . Furthermore, comminution has an influence on the structure of lignin which might enhance the conversion rates of the following process . It also plays a major role when these materials are used as solid biofuels for co‐firing with coal or for combustion with pulverized burners .…”

Section: Introductionmentioning

confidence: 99%

Comminution of biogenic materials

Eisenlauer

Teipel²

2017

Can J Chem Eng

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Renewable resources have been gaining increasing importance for energy generation in recent years. Lignocellulosic biomass, as an alternative to limited crude oil, can be utilized to produce these chemicals. The upstream process of comminution is a key element in the use of renewable raw materials. However, comminution is a highly energy consumptive process, making it necessary to assess the benefits of fine comminution in terms of reducing energy consumption by an adequate characterization of the products. The key factors to increased energy efficiency are, besides the mill type and the mill operation factors, the species of the renewable resource, in terms of water content and the mechanical properties which are the dominant factors in biomass size reduction. A better understanding of these interdependencies can help to improve the adjustment of particle size distribution and particle shape. As well as the total specific surface area and the energy demand for the comminution process, which impacts the overall efficiency of the supply chain process, disintegration, and the conversion. This work, therefore, focuses on the comminution of woody biomass in a cutting mill. It reports the effects of the influencing parameter of the biomass on the comminution process, the energy consumption, and the physical properties of the products regarding their particle size. Furthermore, selected experiments have been carried out on a swing hammer mill to compare the influence of the type of stressing.

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Aufbereitung von nachwachsenden Rohstoffen durch Zerkleinerung

Cited by 5 publications

References 5 publications

Influence factors on the comminution process of wood for the production of precursors and basic chemicals for the chemical industry

Influence factors on the comminution process of wood for the production of precursors and basic chemicals for the chemical industry

Process Technology for Waste Wood Processing

Comminution of biogenic materials

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