Pyrolysis of Pinus pinaster in a two-stage gasifier: Influence of processing parameters and thermal cracking of tar

Fassinou, Wanignon Ferdinand; Steene, Laurent Van de; Touré, Siaka; Volle, Ghislaine; Girard, Philippe

doi:10.1016/j.fuproc.2008.07.016

Cited by 77 publications

(54 citation statements)

References 11 publications

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“…At higher temperature, the endothermic Boudouard reaction and water gas reaction also contributed towards the higher gas yield. Decarboxylation, depolymerization and thermal cracking reactions are also favoured with the increase in temperature [22]. The slight decrease in gas yield at the highest studied temperature of 1050 °C was most likely due to the series of complex repolymerization and condensation reactions favourable at temperature above 1000 °C [8,23].…”

Section: Resultsmentioning

confidence: 93%

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Waheed

2016

Journal of the Energy Institute

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The influence of process conditions on the production of syngas and H2 from biomass in the form of rice husks was investigated using a two-stage pyrolysis-catalytic reforming reactor.The parameters investigated were, reforming temperature, steam flow rate and biomass particle size and the catalyst used was a 10 wt.% Ni-dolomite catalyst. Biomass was pyrolysed in the first stage, and the product volatiles were reformed in the second stage in the presence of steam and the Ni-dolomite catalyst. Increase in catalyst temperature from 850 °C to 1050 °C marginally improved total syngas yield. However, H2 yield was increased from 20.03 mmoles g -1 at 850 °C to 30.62 mmoles g -1 at 1050 °C and H2 concentration in the product gas increased from 53.95 vol.% to 65.18 vol.%. Raising the steam flow rate increased the H2 yield and H2 gas concentration. A significant increase in H2:CO ratio along with a decrease in CO:CO2 ratio suggested a change in the equilibrium of the water gas shift reaction towards H2 formation with increased steam flow rate. The influence of particle size on H2 yield was small showing an increase in H2 production when the particle size was reduced from 2.8 -3.3 to 0.2 -0.5 mm.

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Section: Resultsmentioning

confidence: 93%

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Waheed

2016

Journal of the Energy Institute

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“…A recently published experimental study (Fassinou et al, 2009) of the screw pyrolysis section of the Viking systems show that these condensable substances (incl. H 2 O) contribute to 28-78%wt of the gaseous phase from pyrolysis.…”

Section: Pyrolysismentioning

confidence: 99%

“…As already discussed in Section 3.2.2, the model parameters and gas composition after pyrolysis must however be considered as artificial since the higher hydrocarbons are not explicitly included as model species, but partially accounted for by the non-condensable species and the ungasified raw material. According to experimental data, about 14%vol CH 4 , 40%vol CO, 18%vol CO 2 , 19%vol H 2 and 3%vol C 4 H 4−6 are typically obtained in the dry, non-condensable product at nominal conditions (Fassinou et al, 2009 integration and exergy analysis, the accuracy of the intermediate composition has no influence since only a correct reproduction of the heat demand for pyrolysis is crucial. Indeed, this is assured by the computed nitrogen fraction in the producer gas, which is in very good agreement with the data from the plant.…”

Section: Error Analysismentioning

confidence: 99%

Thermodynamic comparison of the FICFB and Viking gasification concepts

Gassner

Maréchal

2009

Energy

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Two biomass gasification concepts, i.e. indirectly heated, fast internally circulating fluidised bed (FICFB) gasification with steam as gasifying agent and two-stage, directly heated, fixed bed Viking gasification are compared with respect to their performance as gas generators. Based on adjusted equilibrium equations, the gas composition and the energy requirements for gasification are accurately modelled. Overall energy balances are assessed by an energy integration with the heat cascade concept and considering energy recovery in a steam Rankine cycle. A detailed inventory of energy and exergy losses of the different process sections is presented and potential process improvements due to a better utility choice or feed pretreatment like drying or pyrolysis are discussed. While Viking gasification performs better as an isolated gas generator than state-of-the-art FICFB gasification, there is large potential for improvement of the FICFB system. Furthermore, a concluding analysis of the gasification systems in an integrated plant for synthetic natural gas production shows that FICFB gasification is more suitable overall due to a more advantageous energy conversion related to the producer gas composition.

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“…In the pyrolyzer of this gasifier, there is a fuel piston instead of screw machine. The researchers from the De Cocody University are studying the work of a screw pyrolyzer embedded in the multistage gasifier [16].…”

Section: A Review Of Technologies For Multistage Solid Fuel Gasificationmentioning

confidence: 99%

Modeling of Pyrolysis in a Stage Scheme of Low‐Grade Solid Fuel Gasification

Козлов¹,

Levin²,

Svishchev³

et al. 2017

Pyrolysis

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This paper is concerned with the development of a model of wood pyrolysis in a screw reactor as the first stage of the multistage gasification process. In terms of design, the pilot pyrolyzer represents a recuperative heat exchanger where the heat carrier is represented by a mixture of exhaust and recirculation gases. To prevent clinkering of particles and thermal inhomogeneities, screw-type transportation is used to transport fuel. In order to describe kinetics of pyrolysis and transport of volatiles within the wood particles and their transition to the gas phase, we carried out the studies using a complex of synchronous thermal analysis. The original techniques for the interpretation of measurements were developed for this complex, including the techniques for technical analysis of fuels and identification of detailed kinetics and mechanism of pyrolysis. A detailed numerical modeling of pyrolyzer was performed using the Comsol Multiphysics software, which makes it possible to optimize the design and operating parameters of the pyrolysis process in a screw reactor.

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Pyrolysis of Pinus pinaster in a two-stage gasifier: Influence of processing parameters and thermal cracking of tar

Cited by 77 publications

References 11 publications

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Thermodynamic comparison of the FICFB and Viking gasification concepts

Modeling of Pyrolysis in a Stage Scheme of Low‐Grade Solid Fuel Gasification

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