The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform

E Ranzi - One of the best experts on this subject based on the ideXlab platform.

  • a kinetic approach to the mathematical model of Fixed Bed Gasifiers
    Computers & Chemical Engineering, 2011
    Co-Authors: S Sommariva, Roberto Grana, Tiziano Maffei, Sauro Pierucci, E Ranzi
    Abstract:

    This work presents a comprehensive mathematical model of a Fixed Bed gasifier, where heat and mass transport resistances and chemical kinetics are accounted for both at the reactor and the particle scale. A multistep kinetic model of devolatilization of solid fuels, such as coals, plastics, biomasses and wastes has been employed and validated. The kinetic model of refuse derived fuels (RDF) and wastes is simply based on a linear combination of the devolatilization models of its main constituents. Ligno-cellulosic and plastic materials, together with ash and moisture, allow to account for the high heterogeneity of RDF. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows the proper characterization of combustion and gasification of the solid fuel at the particle and reactor scale. The mathematical model of a counterflow Fixed Bed reactor is then applied first to discuss the importance of heat transfer resistances at the particle scale, then to describe coal and biomass gasification. This work summarizes several facets of this problem with validations and examples and it allows to evaluate feasibility and limitations of the proposed approach.

  • detailed kinetics in the mathematical model of Fixed Bed Gasifiers
    Computer-aided chemical engineering, 2010
    Co-Authors: Roberto Grana, S Sommariva, Tiziano Maffei, Alberto Cuoci, T Faravelli, Alessio Frassoldati, Sauro Pierucci, E Ranzi
    Abstract:

    Abstract This work presents a general mathematical model of a Fixed Bed gasifier, where both the transport resistances and the chemical kinetics are important at the reactor and the particle scale. Pyrolysis and gasification of the solid fuel (coal, plastics, biomasses or wastes) is only the first step of the whole process. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows a proper characterization of combustion and gasification of the solid fuel. This work summarizes several facets of this problem with examples and validations. Examples relating to coal and biomass gasification allow evaluating the feasibility and limitations of the proposed approach.

Robert Mikulandric - One of the best experts on this subject based on the ideXlab platform.

  • dynamic modelling of biomass gasification processes in Fixed Bed Gasifiers
    Proceedings of the 10th Conference on Sustainable Development of Energy Water and Environment Systems, 2015
    Co-Authors: Robert Mikulandric, Drazen Loncar, Dorith Boehning, Rene Boehme, Lieve Helsen
    Abstract:

    Gasification is a promising technology for efficient, clean and diverse utilisation of biomass and biomass residues through production of syngas. However, existing technical issues related to process efficiency and environmental standards are preventing the technology to become more economically viable. In order to tackle those issues a lot of attention has been given to biomass gasification process predictive modelling. These models should be robust enough to predict process parameters during variable operating conditions. This could be accomplished either by changes of model input variables such as biomass composition, particle residence time or size or by changes in model structure. This paper analyses the potential of neural network based modelling to predict process parameters during plant operation with variable operating conditions. The dynamic neural network model for gasification purposes will be developed and its performance will be analysed based on measured data. Measurement data for model performance analysis will be derived from a Fixed Bed biomass gasification plant operated by Technical University Dresden (TU Dreseden).

  • artificial neural network modelling approach for a biomass gasification process in Fixed Bed Gasifiers
    Energy Conversion and Management, 2014
    Co-Authors: Robert Mikulandric, Drazen Loncar, Dorith Bohning, Rene Bohme, Michael Beckmann
    Abstract:

    The number of the small and middle-scale biomass gasification combined heat and power plants as well as syngas production plants has been significantly increased in the last decade mostly due to extensive incentives. However, existing issues regarding syngas quality, process efficiency, emissions and environmental standards are preventing biomass gasification technology to become more economically viable. To encounter these issues, special attention is given to the development of mathematical models which can be used for a process analysis or plant control purposes. The presented paper analyses possibilities of neural networks to predict process parameters with high speed and accuracy. After a related literature review and measurement data analysis, different modelling approaches for the process parameter prediction that can be used for an on-line process control were developed and their performance were analysed. Neural network models showed good capability to predict biomass gasification process parameters with reasonable accuracy and speed. Measurement data for the model development, verification and performance analysis were derived from biomass gasification plant operated by Technical University Dresden.

S Sommariva - One of the best experts on this subject based on the ideXlab platform.

  • a kinetic approach to the mathematical model of Fixed Bed Gasifiers
    Computers & Chemical Engineering, 2011
    Co-Authors: S Sommariva, Roberto Grana, Tiziano Maffei, Sauro Pierucci, E Ranzi
    Abstract:

    This work presents a comprehensive mathematical model of a Fixed Bed gasifier, where heat and mass transport resistances and chemical kinetics are accounted for both at the reactor and the particle scale. A multistep kinetic model of devolatilization of solid fuels, such as coals, plastics, biomasses and wastes has been employed and validated. The kinetic model of refuse derived fuels (RDF) and wastes is simply based on a linear combination of the devolatilization models of its main constituents. Ligno-cellulosic and plastic materials, together with ash and moisture, allow to account for the high heterogeneity of RDF. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows the proper characterization of combustion and gasification of the solid fuel at the particle and reactor scale. The mathematical model of a counterflow Fixed Bed reactor is then applied first to discuss the importance of heat transfer resistances at the particle scale, then to describe coal and biomass gasification. This work summarizes several facets of this problem with validations and examples and it allows to evaluate feasibility and limitations of the proposed approach.

  • detailed kinetics in the mathematical model of Fixed Bed Gasifiers
    Computer-aided chemical engineering, 2010
    Co-Authors: Roberto Grana, S Sommariva, Tiziano Maffei, Alberto Cuoci, T Faravelli, Alessio Frassoldati, Sauro Pierucci, E Ranzi
    Abstract:

    Abstract This work presents a general mathematical model of a Fixed Bed gasifier, where both the transport resistances and the chemical kinetics are important at the reactor and the particle scale. Pyrolysis and gasification of the solid fuel (coal, plastics, biomasses or wastes) is only the first step of the whole process. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows a proper characterization of combustion and gasification of the solid fuel. This work summarizes several facets of this problem with examples and validations. Examples relating to coal and biomass gasification allow evaluating the feasibility and limitations of the proposed approach.

Roberto Grana - One of the best experts on this subject based on the ideXlab platform.

  • a kinetic approach to the mathematical model of Fixed Bed Gasifiers
    Computers & Chemical Engineering, 2011
    Co-Authors: S Sommariva, Roberto Grana, Tiziano Maffei, Sauro Pierucci, E Ranzi
    Abstract:

    This work presents a comprehensive mathematical model of a Fixed Bed gasifier, where heat and mass transport resistances and chemical kinetics are accounted for both at the reactor and the particle scale. A multistep kinetic model of devolatilization of solid fuels, such as coals, plastics, biomasses and wastes has been employed and validated. The kinetic model of refuse derived fuels (RDF) and wastes is simply based on a linear combination of the devolatilization models of its main constituents. Ligno-cellulosic and plastic materials, together with ash and moisture, allow to account for the high heterogeneity of RDF. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows the proper characterization of combustion and gasification of the solid fuel at the particle and reactor scale. The mathematical model of a counterflow Fixed Bed reactor is then applied first to discuss the importance of heat transfer resistances at the particle scale, then to describe coal and biomass gasification. This work summarizes several facets of this problem with validations and examples and it allows to evaluate feasibility and limitations of the proposed approach.

  • detailed kinetics in the mathematical model of Fixed Bed Gasifiers
    Computer-aided chemical engineering, 2010
    Co-Authors: Roberto Grana, S Sommariva, Tiziano Maffei, Alberto Cuoci, T Faravelli, Alessio Frassoldati, Sauro Pierucci, E Ranzi
    Abstract:

    Abstract This work presents a general mathematical model of a Fixed Bed gasifier, where both the transport resistances and the chemical kinetics are important at the reactor and the particle scale. Pyrolysis and gasification of the solid fuel (coal, plastics, biomasses or wastes) is only the first step of the whole process. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows a proper characterization of combustion and gasification of the solid fuel. This work summarizes several facets of this problem with examples and validations. Examples relating to coal and biomass gasification allow evaluating the feasibility and limitations of the proposed approach.

Tiziano Maffei - One of the best experts on this subject based on the ideXlab platform.

  • a kinetic approach to the mathematical model of Fixed Bed Gasifiers
    Computers & Chemical Engineering, 2011
    Co-Authors: S Sommariva, Roberto Grana, Tiziano Maffei, Sauro Pierucci, E Ranzi
    Abstract:

    This work presents a comprehensive mathematical model of a Fixed Bed gasifier, where heat and mass transport resistances and chemical kinetics are accounted for both at the reactor and the particle scale. A multistep kinetic model of devolatilization of solid fuels, such as coals, plastics, biomasses and wastes has been employed and validated. The kinetic model of refuse derived fuels (RDF) and wastes is simply based on a linear combination of the devolatilization models of its main constituents. Ligno-cellulosic and plastic materials, together with ash and moisture, allow to account for the high heterogeneity of RDF. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows the proper characterization of combustion and gasification of the solid fuel at the particle and reactor scale. The mathematical model of a counterflow Fixed Bed reactor is then applied first to discuss the importance of heat transfer resistances at the particle scale, then to describe coal and biomass gasification. This work summarizes several facets of this problem with validations and examples and it allows to evaluate feasibility and limitations of the proposed approach.

  • detailed kinetics in the mathematical model of Fixed Bed Gasifiers
    Computer-aided chemical engineering, 2010
    Co-Authors: Roberto Grana, S Sommariva, Tiziano Maffei, Alberto Cuoci, T Faravelli, Alessio Frassoldati, Sauro Pierucci, E Ranzi
    Abstract:

    Abstract This work presents a general mathematical model of a Fixed Bed gasifier, where both the transport resistances and the chemical kinetics are important at the reactor and the particle scale. Pyrolysis and gasification of the solid fuel (coal, plastics, biomasses or wastes) is only the first step of the whole process. Successive gas phase reactions of the released species are descriBed with a detailed kinetic scheme. Furthermore, an accurate description of heat and mass transport between gas and solid phases allows a proper characterization of combustion and gasification of the solid fuel. This work summarizes several facets of this problem with examples and validations. Examples relating to coal and biomass gasification allow evaluating the feasibility and limitations of the proposed approach.