Feeding small biomass particles at low rates

Molinder, Roger; Wiinikka, Henrik

doi:10.1016/j.powtec.2014.09.010

Cited by 12 publications

(10 citation statements)

References 28 publications

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“…The system can be divided into the following sections: biomass feeding, pyrolysis, solid residue separation, catalysis, oil condensation and collection, and gas analysis. In the biomass feeding section, the ground and sieved biomass was added using a syringe pump and a vibrator described previously at a speed of 1 g min –1 . The biomass was fed through a water-cooled particle injection tube into the second heating zone in the pyroDTF.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Biofuel Production via Catalytic Hydropyrolysis and Hydro-Coprocessing

et al. 2021

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In order to successfully integrate biomass pyrolysis oils as starting materials for conventional oil refineries, upgrading of the pyrolysis oils is needed to achieve desired properties, something which can be performed either as part of the pyrolysis process and/or by separate catalytic treatment of the pyrolysis intermediate oil products. In this study, the quality of stem wood-derived pyrolysis oil was improved via ex situ catalytic hydropyrolysis in a bench-scale pyrolyzer (stage 1), followed by catalytic hydro-coprocessing with fossil co-feed in a laboratory-scale high pressure autoclave (stage 2). The effect of pyrolysis upgrading conditions was investigated based on the quality of intermediate products and their suitability for hydro-coprocessing. HZSM-5 and Pt/TiO2 catalysts (400 °C, atmospheric pressure) were employed for ex situ pyrolysis, and the NiMoS/Al2O3 catalyst (330 °C, 100 bar H2 initial pressure) was used for hydro-coprocessing of the pyrolysis oil. The application of HZSM-5 in the pyrolysis of stem wood under a N2 atmosphere decreased the formation of acids, ketones, aldehydes, and furans and increased the production of aromatic hydrocarbons and phenolics (guaiacols and phenols). Replacing HZSM-5 with Pt/TiO2 and N2 with H2 resulted in complete conversion of guaiacols and significant production of phenols, with further indications of increased stability and reduced coking tendencies.

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Section: Methodsmentioning

confidence: 99%

Enhanced Biofuel Production via Catalytic Hydropyrolysis and Hydro-Coprocessing

et al. 2021

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“…The EFR was designed to operate at temperatures up to 1400 °C using five individually controlled heating zones (each 354 mm long). The powder was injected pneumatically into the EFR with a syringe particle feeder 30 installed above the EFR. The powder transport gas (N 2 ) flow rate (1 NL/min) was controlled by a mass flow controller (MFC).…”

Section: Methodsmentioning

confidence: 99%

Pulverized Sponge Iron, a Zero-Carbon and Clean Substitute for Fossil Coal in Energy Applications

et al. 2018

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The direct combustion of recyclable metals has the potential to become a zero-carbon energy production alternative, much needed to alleviate the effects of global climate change caused by the increased emissions of the greenhouse gas CO2. In this work, we show that the emission of CO2 is insignificant during the combustion of pulverized sponge iron compared to that of pulverized coal combustion. The emissions of the other harmful pollutants NO x and SO2 were 25 and over 30 times lower, respectively, than in the case of pulverized coal combustion. Furthermore, 96 wt % of the solid combustion products consisted of micrometer-sized, solid or hollow hematite (α-Fe2O3) spheres. The remaining 4 wt % of products was maghemite (γ-Fe2O3) nanoparticles. According to thermodynamic calculations, this product composition implies near-complete combustion, with a conversion above 98%. The results presented in this work strongly suggest that sponge iron is a clean energy carrier and may become a substitute to pulverized coal as a fuel in existing or newly designed industrial systems.

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“…Particles were fed through a water-cooled injection tube as described in detail elsewhere. 29 The vertical Al 2 O 3 reactor tube (2100 mm × 50 mm i.d.) had end-caps mounted at each end.…”

Section: Methodsmentioning

confidence: 99%

“…The DTF (Figure ) consisted of an injection system for gas and particles, a reactor tube, and a quenching sampling probe. Particles were fed through a water-cooled injection tube as described in detail elsewhere . The vertical Al 2 O 3 reactor tube (2100 mm × 50 mm i.d.)…”

Section: Methodsmentioning

confidence: 99%

Effects of Pyrolysis Conditions and Ash Formation on Gasification Rates of Biomass Char

et al. 2017

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Pyrolysis conditions and the presence of ash-forming elements significantly influence char properties and its oxidation or gasification reactivity. In this study, intrinsic gasification rates of char from high heating rate pyrolysis were analyzed with isothermal thermogravimetry. The char particles were prepared from two biomasses at three size ranges and at two temperatures. Reactivity dependence on original particle size was found only for small wood particles that had higher intrinsic char gasification rates. Pyrolysis temperature had no significant effect on char reactivity within the range tested. Observations of ash formation highlighted that reactivity was influenced by the presence of ash-forming elements, not only at the active char sites but also through prohibition of contact between char and gasification agent by ash layer formation with properties highly depending on ash composition.

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Feeding small biomass particles at low rates

Cited by 12 publications

References 28 publications

Enhanced Biofuel Production via Catalytic Hydropyrolysis and Hydro-Coprocessing

Enhanced Biofuel Production via Catalytic Hydropyrolysis and Hydro-Coprocessing

Pulverized Sponge Iron, a Zero-Carbon and Clean Substitute for Fossil Coal in Energy Applications

Effects of Pyrolysis Conditions and Ash Formation on Gasification Rates of Biomass Char

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