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  • 1. Budinova, T.
    et al.
    Ekinci, E.
    Yardim, F.
    Grimm, Alejandro
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Minkova, V.
    Goranova, M.
    Characterization and application of activated carbon produced by H3PO4 and water vapor activation2006Ingår i: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 87, nr 10, s. 899-905Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Activated carbons have been prepared from woody biomass birch by using various activation procedures: a) treatment with phosphoric acid and pyrolysis at 600 degrees C in inert atmosphere, b) the same as in (a) followed by steam activation at the same temperature and c) treatment with phosphoric acid and direct pyrolysis in a stream of water vapor at 700 degrees C. The surface area and the porosity of the activated carbons were strongly dependent on the treatment after impregnation with H3PO4 (pyrolysis in inert atmosphere, steam pyrolysis or combination of both). Activated carbon, prepared by impregnation with phosphoric acid followed by steam pyrolysis (steam activation) had highly developed porous structure and the largest surface area among all prepared carbons (iodine number 1280 mg/g and BET surface area 1360 m(2)/g). The adsorption capacity of this sample for Hg(II) from aqueous solution was studied in varying treatment conditions: contact time, metal ion concentration and pH. The adsorption followed Langmuir isotherms and the adsorption capacity for Hg(II) at 293 K was 160 mg/g.

  • 2.
    Erlich, Catharina
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Bolado, David
    Giner, Marian
    Fransson, Torsten
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Pyrolysis and gasification of pellets from sugar cane bagasse and wood2006Ingår i: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 85, nr 10-11, s. 1535-1540Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Wood pellets have become a popular form of biomass for power generation and residential heating due to easier handling both for transportation and for feeders in the treatment units, improved conversion and storage possibilities. The research on wood pellets as fuel has also been intensified during the past decade. However, other biomass sorts in pellet form, such as sugar cane bagasse, have not yet been extensively studied, especially not physical effects on the pellets during thermal treatment. Bagasse and wood pellets of different origin and sizes, shredded bagasse and wood chips have been studied in a thermogravimetric equipment to compare the effects of sort, origin, size and form of biomass during slow pyrolysis and steam gasification. Physical parameters such as decrease of volume and mass during treatment, as well as pyrolysis and gasification rates are of primary interest in the study. An important observation from the study is that for pellets the char density decreased during pyrolysis to a minimum around 450 degrees C, but thereafter increased with continued heating. The wood chips behaved differently with a continuous char density decrease during pyrolysis. Another conclusion from the work is that the size of the pellet has larger impact on the shrinkage behaviour throughout the conversion than the raw material, which the pellet is made of.

  • 3.
    Erlich, Catharina
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
    Öhman, Marcus
    Umeå Universitet.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Fransson, Torsten
    KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Kraft- och värmeteknologi.
    Thermochemical characteristics of sugar cane bagasse pellets2005Ingår i: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 84, nr 5, s. 569-575Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Pelletisation facilitates utilisation of sugar cane bagasse as a fuel and storage for year-round electricity generation. The present work determines thermochemical characteristics of bagasse pellets of different sizes and origins, using various temperatures (600, 750 and 900 degrees C) and gas flow rates (4, 7 and 10 L/min) with varying concentrations of oxygen (5, 10 and 15 %) in mixtures with nitrogen. Of major interest are the effects of raw material, origin and size of pellets, and the treatment conditions on the rate of pyrolysis and the structure and reactivity of char in combustion. The char yield of the larger pellets of high-ash content bagasse was practically independent of treatment conditions. Smaller pellets gave better mechanical stability of the char but lower reactivity.

  • 4.
    Grimm, Alejandro
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Górdon, M.
    Zanzi, Rolando
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik. KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Catalytic oxidation of combustibles representative of flue gases from wood combustion2005Konferensbidrag (Refereegranskat)
  • 5.
    Grimm, Alejandro
    et al.
    KTH, Tidigare Institutioner, Kemiteknik. KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Pérez Gordón, Maria
    Zanzi, Rolando
    KTH, Tidigare Institutioner, Kemiteknik. KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Björnbom, Emilia
    KTH, Tidigare Institutioner, Kemiteknik. KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Laboratory tests of catalysts for total oxidation of combustibles representative for flue gases from combustion of wood2004Konferensbidrag (Refereegranskat)
  • 6.
    Grimm, Alejandro
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Suarez, José
    Facultad de Ingeniería Mecánica, Universidad de Oriente. Santiago de Cuba, Cuba.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Zanzi Vigouroux, Rolando
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Preliminary tests with a birch wood pellets up-draft air gasifier2004Ingår i: International Scientific Conference of Mechanical Engineering, 2004Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    In Sweden and Cuba a variety of biomass have being investigated for energyconversion through termochemical processes into solid, liquids and gaseous products. Biomass gasification in fixed bed seem to be attractive option for the conversion ofagricultural and forest residues into gases suitable for use as alternative fuel in gasengines in rural areas, heat or electricity production.

    This paper discusses the performance characteristics of a up - draft gasifier withBirch wood pellets. The bench scale gasifier was designed and built in the Royal Istitute of Technology, Sweden.

    A series of parameters, such as the gas and liquids yields, temperatures and ash yield were measured as a function of the time.

  • 7.
    Grimm, Alejandro
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Zanzi, Rolando
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Cukierman, A. L.
    Tecnología Especial, Depto Tecnología Farmacéutica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires.
    Comparison of different types of biomasses for copper biosorption2007Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 99, nr 7, s. 25559-2565Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Three biomass, birch wood Betula sp., marine brown alga Fucus vesiculosus, and terrestrial moss Pleurozium schreberi, have been compared as raw materials for preparation of biosorbents for removal of copper ions from diluted water solutions. Small sample doses (0.5 g/100 ml) of the biosorbents prepared from alga and moss enabled more than 90% removal of Cu(II) ions from diluted water solutions (5-20 mg/l). The sample from sawdust was less effective.A pseudo-second-order rate model properly described the experimental kinetic data for the biosorbents. The maximum sorption capacities (X,) determined from the experimental equilibrium isotherms by applying the Langmuir model showed that the alga had the best copper-binding ability (X-m = 23.4 mg/g), followed by the moss (X-m = 11.1 mg/g), and the sawdust (X-m = 4.9 mg/g). No visible damages or performance losses were detected for the alga and moss after five sorption-desorption cycles using diluted HCl as eluent.

  • 8.
    Myrén, Carin
    et al.
    KTH, Tidigare Institutioner, Kemiteknik.
    Hörnell, Christina
    KTH, Tidigare Institutioner, Kemiteknik.
    Björnbom, Emilia
    KTH, Tidigare Institutioner, Kemiteknik.
    Sjöström, Krister
    KTH, Tidigare Institutioner, Kemiteknik.
    Catalytic tar decomposition of biomass pyrolysis gas with a combination of dolomite and silica2002Ingår i: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 23, nr 3, s. 217-227Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study the catalytic effects of dolomite and silica on biomass tar decomposition were investigated. The concentration of naphthalene is of particular interest since it is the most difficult compound to decompose when dolomite is used as catalyst. The two catalysts were tested in different combinations to see whether synergetic effects on the cracking of naphthalene could be found. Thermal and catalytic cracking were carried out at 700-900degreesC under ambient pressure in a fixed bed reactor using a tar-rich gas obtained from pyrolysis of different biomass materials. Characterisation of light components of tars using the solid phase adsorption method was also performed. Experimental results indicate that when a pure silica is placed in a layer above the dolomite, considerably less naphthalene and total light tar remains after cracking.

  • 9.
    Zanzi, Rolando
    et al.
    KTH, Tidigare Institutioner, Kemiteknik. KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Sjöström, Krister
    KTH, Tidigare Institutioner, Kemiteknik. KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Björnbom, Emilia
    KTH, Tidigare Institutioner, Kemiteknik. KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Rapid pyrolysis of agricultural residues at high temperature2002Ingår i: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 23, nr 5, s. 357-366Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper deals with rapid pyrolysis of agricultural residues such as olive waste and straw at high temperature (800 -1000degreesC) in a free-fall reactor at pilot scale. The conditions are of interest for gasification in fluidized beds where rapid pyrolysis plays an important role as first stage. The objective of the work is to study the effect of the process conditions such as heating rate, temperature and particle size on the product distribution, gas composition and char reactivity. A higher temperature and smaller particles increase the heating rate resulting in a decreased char yield. The cracking of the hydrocarbons with an increase in the hydrogen content is favoured by a higher temperature and by using smaller particles. Wood gives more volatiles and less char than straw and olive waste. The higher ash content in agricultural residues favours the charring reactions. The higher lignin content in olive waste results in a higher char yield in comparison with straw. Chars from olive waste and straw are more reactive in gasification than chars from birch because of the higher ash content.

  • 10.
    Zanzi Vigouroux, Rolando
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Grimm, Alejandro
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Biosorbentes para la remoción de cobre (II) en soluciones acuosas2005Konferensbidrag (Refereegranskat)
  • 11.
    Zanzi Vigouroux, Rolando
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Soria, Santiago
    Dept. of Chemical and Environmental Engineering, Univ. of Zaragoza, Spain.
    Grimm, Alejandro
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    FIXED BED UPDRAFT GASIFICATION OF BIOMASS2005Ingår i: 14th European Biomass Conference and Exhibition, ETA-Florence, Italy and WIP-Munich, Germany , 2005Konferensbidrag (Refereegranskat)
    Abstract [en]

    The paper presents the initial work performed in a newly built updraft gasifier. Densified woody biomass, birch, in form of pellets with a diameter of 8 mm and a length between 5 and 15 mm has been used as a raw material for batch autothermal gasification using air as an oxidation agent. The main objectives were to study the effect of the treatment conditions on the distribution of the products and the composition of product gas to establish the suitability of the gasifier to produce combustible gas with sufficiently high calorific value.The amount of the biomass used in the experiments was varied between 1 and 4 kg and the flow rate of the oxidation agent, air, was varied from 1,1 to 2,6 m3/h. Increased airflow rates favored higher temperatures, however, excessively high airflow rates resulted in fast consumption of the biomass and it also favored combustion over gasification and thus formation of lower amounts of combustible products. High airflow rates caused also higher yields of liquid products, due to the shorter residence time of the tar-rich gas in the gasifier and thus unfavorable conditions for tar cracking.

  • 12.
    Zanzi Vigouroux, Rolando
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
    Majari, Mehdi
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk reaktionsteknik.
    Biomass pre-treatment by torrefaction2008Konferensbidrag (Refereegranskat)
  • 13.
    Zanzi Vigouroux, Rolando
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    Tito Ferro, Daria
    Universidad de Oriente, Santiago de Cuba, Cuba.
    Torres, Alejandro
    Universitat de Barcelona, Barcelona, Spain.
    Beaton Soler, Pedro
    Universidad de Oriente, Santiago de Cuba, Cuba.
    Björnbom, Emilia
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik.
    BIOMASS TORREFACTION2004Ingår i: 2nd World Conf. on Biomass for Energy, Industry and Climate Protection, 2004, s. 859-862Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents a work on biomass torrefaction performed in a laboratory unit with a reactor tube of a length of 0.5 m and an inner diameter of 0.04 m. The experiments are conducted with miscanthus, birch, salix as well as with wood and straw pellets. The reactor was heated to the selected temperature (230°C, 250°C or 280°C) and kept at the final temperature for a period of 1, 2 or 3 hours. The effect of the raw material, temperature, and residence time on the properties of the torrefied products is studied. The torrefied biomass products are characterized with elemental composition, energy content, moisture content, ash content and volatile fraction. The gaseous products are also analysed. The type of biomass influenced the product distribution. During torrefaction biomass undergoes changes in physical and chemical properties. The fixed carbon content and energy density increase with both time and temperature of torrefaction, while the yield on a weight basis decreases. The torrefied biomass has hydrophobic properties and a higher calorific value than the raw material.

1 - 13 av 13
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