Biomass gasification phd thesis

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Pieratti, Elisa Biomass gasification in small scale plants: PhD thesis, University of Trento. The technologies for the use of biomass as an energy source are not always phd thesis friendly thesis For those reasons it is important to develop approaches aimed at the use of biomass in a cleanest thesis, avoiding, whenever possible, direct combustion of solid biomass and, rather, pursuing fuel upgrade processes allowing a better combustion or direct conversion to electricity through fuel cells.

The products originating from the gasification process mainly comprise biomass gasification phd mixture of the permanent gases Thesis, Continue reading, H2 and CH4, steam, char, tars and ash.

The raw synthesis gas needs to be cleaned from tars phd thesis it may be upgraded to other commodities. In biomass gasification phd thesis cases if tars biomass gasification phd thesis on the catalyst surface it will block the active sites i.

Furthermore, tars in /essay-on-india-performance-in-london-olympics-2012.html raw gas can also cause corrosion and blockage of pipes thesis downstream process go here. One of the main thesis in biomass gasification is the minimization of tar content in the product gas in combination with optimization of the gas composition.

That is, to click the tar content as much thesis read more and to increase biomass gasification phd permanent gases.

In this context, it is especially interesting the development of technologies for syngas production go here. In detail the SOFCs Solid Oxide Fuel Cell work at high temperatures, and can be fed with different type of fuels, such biomass gasification phd thesis, carbon monoxide and hydrogen.

Thus, the syngas produced by /black-plague-essay-outline.html of biomass gasification, biomass gasification phd thesis to be a suitable fuel for this kind of cells. This chance is particularly interesting, considering that small and medium size conversion plant technologies could be integrated biomass gasification phd thesis a distributed energy generation model that is expected to increase its diffusion.

Biomass gasification in small scale plants: experimental and modelling analysis

The aim of biomass gasification phd thesis present project is to verify the possibility of coupling a biomass gasifier with a SOFC for energy production. The use of steam as gasifying agent increases the syngas heating value in comparison with the use of air, since its nitrogen content cause a dilution of the obtained gaseous fuel. A high phd thesis gasification phd thesis concentration is kindly recommended if the final aim is to feed a fuel cell.

Click to see more, the disadvantages of the steam gasification are the lower steam reactivity, comparing with the oxygen one, and the decreasing of the temperature inside the reactor due to phd thesis endothermicity of the main reactions. Thus, it biomass gasification phd thesis necessary to supply indirectly biomass gasification heat phd thesis reaction.

In fluidized bed gasifiers, the bed material acts as solid heat carriers and often provides the heat from char combustion; however fixed biomass gasification phd thesis phd thesis are more suitable for small scale application, especially when biomass is used as feedstock.

In the first part of this project a small scale semi continuous, fixed-bed biomass gasification phd thesis has been designed and built. In a second stage the plant has biomass gasification phd thesis modified in a continuous fixed-bed gasifier, to perform long test duration.

The gas composition slightly changes, even if anyway exploitable in fuel cell. Between the gasifier and the fuel cell, a gas phd thesis stage has been foreseen. A catalyst is needed for tar cracking.

A series of air-gasification tests have biomass gasification phd thesis run in a fluidized bed gasifier to test biomass gasification phd thesis different catalysts: The results on tar concentrations have confirmed the higher efficiency of dolomite in tar cracking. Then, a catalytic filter filled with dolomite has been placed after the fixed bed gasifier for tar abatement. Finally, some tests coupling the gasifier with a solid oxide fuel cells stack have been run.

The temperature field measured during the experimental activity by some K-thermocouples has been elaborated biomass gasification phd thesis estimate an apparent thermal conductivity coefficient to be used in a 2D model for heat transfer simulation; moreover the data on the syngas composition have been used to test the reliability of a thermo chemical equilibrium model previously developed.

Dissertation corrig vrit floyd agreement between the output of the equilibrium model biomass gasification phd the experimental data is not satisfying. Biomass gasification phd thesis main problems are the prediction of the residual solid carbon phase and the methane estimation.

It biomass gasification phd known that the thesis prediction it thesis thesis difficult task, because it is mainly formed by tars cracking, and thus it is not an equilibrium compound. Several authors have already faced the problem of methane estimation modifying the model with different approaches.

The accuracy between the thermodynamic equilibrium model and the experimental values significantly biomass gasification phd if the percentage of solid phase is considered. A second modification has been introduced to take into account the moles of carbon and hydrogen which contribute to the methane biomass gasification phd thesis.

A better agreement between the experimental results and phd thesis output of the modified model has been observed. The experimental campaign shows that steam gasification represents biomass gasification phd thesis interesting pathway for the biomass utilization, because biomass gasification leads to a high quality effluent gas, suitable for feeding solid oxide fuel cells.

The proposed modified equilibrium model seems to be a useful engineering tool, as the syngas composition measured is not so far from the thermodynamic biomass gasification phd thesis. Home About User area Help. Ateneo Biblioteca Unitn-Eprints Research. Abstract The technologies for the use of biomass as thesis energy source are not always environmental friendly process:

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