National Repository of Grey Literature 5 records found  Search took 0.06 seconds. 
Effect of particle size of high-temperature biochar on its properties
Sedmihradská, Anežka ; Skoblia, S. ; Beňo, Z. ; Moško, Jaroslav ; Fajgar, Radek ; Soukup, Karel ; Pohořelý, Michael
High-temperature biochar is an increasingly used soil amendment, especially in areas where the physical properties of the soil need to be improved. This ecologically promising material has so far been studied mainly in relation to production temperature or the input material. The effects of particle size on the properties of biochar have so far been studied insufficiently. This work seeks to expand the knowledge in this particular area. \n
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Production and characterization of high-temperature biochar.
Sedmihradská, Anežka ; Skoblia, S. ; Beňo, Z. ; Moško, Jaroslav ; Pohořelý, Michael
Thermochemical conversion of biomass produces solid residue that is further used in agriculture called biochar. Studied biochar was produced in twin-fire two-staged gasifier from waste wood biomass. Heat and electricity were produced together with biochar. Biochar samples were analysed and assessed as a soil amendment. Results were compared to legal standards and voluntary certificate limits. It was concluded that studied biochar meet all criteria for utilization as a soil amendment.
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Utilization of waste from processing of industrial hemp for production of carbonaceous adsorbents.
Šrámek, V. ; Staf, M. ; Pohořelý, Michael ; Beňo, Z.
Utilization of waste biomass for production of carbonaceous adsorbents would be a suitable substitution of comercially available activated carbon. This work focuses on a two step preparation in two separate apparatus of own construction operated at UCT Prague. The first step involves pyrolysis of the hemp hurd at temperature range 450–850 °C and the second step is based on activation of the pyrolysis residue via steam at temperatures 740 and 800 °C. The prepared activated material was examined for key sorption parameters: specific surface are by BET equation, total specific pore volume and pore size distribution. The results were compared to comercially available activated carbon produced also via the steam activation.
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Plný tet: SKMBT_C22020012013491 - Download fulltextPDF
Influence of pyrolysis temperature on the quality of biochar.
Sedmihradská, Anežka ; Pohořelý, Michael ; Skoblia, S. ; Beňo, Z. ; Farták, J.
Biochar is a solid residue from biomass carbonization processes that ca be further used in agriculture. Parameters influencing quality of biochar are pyrolysis temperature, heating rate, residence time, type of the reactor and type of feed biomass. This work addresses the influence of pyrolysis temperature.
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Plný tet: SKMBT_C22020012013490 - Download fulltextPDF
Biochar Preparation in Quality of Activated Carbon via Pyrolysis of Hemp Waste
Šrámek, V. ; Staf, M. ; Pohořelý, Michael
The paper describes the preparation of adsorbents with the properties of activated carbon from biomass waste. Prime feedstock are hemp stems and a referential material is hardwood. The preparation is divided in two phases. The first phase includes pyrolysis in the temperature range 450-850 °C in the horizontal furnace and in the second phase the pyrolysed material is activated with steam and carbon dioxide in a vertical reactor. Finally, biochar was analyzed and relevant properties including BET surface and pore size distribution were determined to appoint suitable operational conditions for the biochar production in quality of activated carbon.\n
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Plný tet: SKMBT_C22019040809400 - Download fulltextPDF

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