The Experts below are selected from a list of 22017 Experts worldwide ranked by ideXlab platform

Qiuhui Yan - One of the best experts on this subject based on the ideXlab platform.

  • thermodynamic modeling and analysis of Biomass Gasification for hydrogen production in supercritical water
    Chemical Engineering Journal, 2007
    Co-Authors: Liejin Guo, Ximin Zhang, Qiuhui Yan
    Abstract:

    Abstract Biomass Gasification in supercritical water is a promising technology for hydrogen production by utilizing wet Biomass. A new experimental system of Biomass Gasification in supercritical water was built in SKLMF. In this paper, a comprehensive thermodynamic analysis, including chemical equilibrium in the reactor, gas–liquid equilibrium in the high-pressure separator, exergy and energy analysis of the whole system, was conducted. Chemical equilibrium model is based on minimizing Gibbs free energy. By chemical equilibrium analysis in the reactor, rules of the main parametric effects on Biomass Gasification in supercritical water are obtained. Simultaneously, a high-pressure gas–liquid equilibrium model was proposed based on modified universal functional activity coefficient (UNIFAC) model, Soave–Redlich–Kwong (SRK) equation of state and modified Huron–Vidal second-order (MHV2) mixing rule. Effects of pressure, temperature and water recycled ratio on gas–liquid equilibrium in high-pressure separation were discussed. Finally, results from energy and exergy analysis show that energy and exergy efficiencies of the whole system are in excess of 40% and increase with increasing heat transfer efficiencies. Energy loss of the system is caused mainly by heat transfer and exergy loss is mainly caused by heat transfer and chemical reaction. Our research provided a thermodynamic tool for improvement of design and operation optimization of Biomass Gasification system in SKLMF, which may be also applicable to other Biomass Gasification system.

  • hydrogen production by Biomass Gasification in supercritical water a parametric study
    International Journal of Hydrogen Energy, 2006
    Co-Authors: Liejin Guo, Ximin Zhang, Xiaohong Hao, Qiuhui Yan
    Abstract:

    Hydrogen production by Biomass Gasification in supercritical water is a promising technology for utilizing high moisture content Biomass, but reactor plugging is a critical problem when feedstocks with high Biomass content are gasified. The objective of this paper is to prevent the plugging problem by studying the effects of the various parameters on Biomass Gasification in supercritical water. These parameters include pressure, temperature, residence time, reactor geometrical configuration, reactor types, heating rate, reactor wall properties, Biomass types, Biomass particle size, catalysts and solution concentration. Biomass model compounds (glucose, cellulose) and real Biomass are used in this work. All the Biomasses have been successfully gasified and the product gas is composed of hydrogen, carbon dioxide, methane, carbon monoxide and a small amount of ethane and ethylene. The results show that the gas yield of Biomass Gasification in supercritical water is sensitive to some of the parameters and the ways of reducing reactor plugging are obtained.

Liejin Guo - One of the best experts on this subject based on the ideXlab platform.

  • hydrogen production by Biomass Gasification in supercritical water with a fluidized bed reactor
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Hui Jin, Liejin Guo, Ximin Zhang, Changqing Cao, Xu Guo
    Abstract:

    Abstract Hydrogen production by Biomass Gasification in supercritical water (SCW) is a promising technology for utilizing high moisture content Biomass, but reactor plugging is a critical problem for Biomass Gasification in the tubular reactor. A novel SCW fluidized bed system for Biomass Gasification was developed successfully in State Key Laboratory of Multiphase Flow in Power Engineering (SKLMF) to prevent the plugging and it was designed for the temperature up to 923 K and the pressure up to 30 MPa. Model compound (glucose) and real Biomass (corn cob) were gasified under SCW conditions to generate hydrogen-rich fuel gas and a performance testing of the new SCW fluidized bed system was conducted. The product gas composed of H2, CH4, CO2, CO and small amount of C2H4 and C2H6 was obtained. The effects of solution concentration, temperature, pressure and oxidant concentration on Gasification were studied. 30 wt% glucose and 18 wt% corn cob feedstocks were continually and stably gasified and reactor plugging was not observed. The results showed that using fluidized bed reactor for Biomass Gasification in SCW has many advantages and good prospects.

  • thermodynamic modeling and analysis of Biomass Gasification for hydrogen production in supercritical water
    Chemical Engineering Journal, 2007
    Co-Authors: Liejin Guo, Ximin Zhang, Qiuhui Yan
    Abstract:

    Abstract Biomass Gasification in supercritical water is a promising technology for hydrogen production by utilizing wet Biomass. A new experimental system of Biomass Gasification in supercritical water was built in SKLMF. In this paper, a comprehensive thermodynamic analysis, including chemical equilibrium in the reactor, gas–liquid equilibrium in the high-pressure separator, exergy and energy analysis of the whole system, was conducted. Chemical equilibrium model is based on minimizing Gibbs free energy. By chemical equilibrium analysis in the reactor, rules of the main parametric effects on Biomass Gasification in supercritical water are obtained. Simultaneously, a high-pressure gas–liquid equilibrium model was proposed based on modified universal functional activity coefficient (UNIFAC) model, Soave–Redlich–Kwong (SRK) equation of state and modified Huron–Vidal second-order (MHV2) mixing rule. Effects of pressure, temperature and water recycled ratio on gas–liquid equilibrium in high-pressure separation were discussed. Finally, results from energy and exergy analysis show that energy and exergy efficiencies of the whole system are in excess of 40% and increase with increasing heat transfer efficiencies. Energy loss of the system is caused mainly by heat transfer and exergy loss is mainly caused by heat transfer and chemical reaction. Our research provided a thermodynamic tool for improvement of design and operation optimization of Biomass Gasification system in SKLMF, which may be also applicable to other Biomass Gasification system.

  • hydrogen production by Biomass Gasification in supercritical water a parametric study
    International Journal of Hydrogen Energy, 2006
    Co-Authors: Liejin Guo, Ximin Zhang, Xiaohong Hao, Qiuhui Yan
    Abstract:

    Hydrogen production by Biomass Gasification in supercritical water is a promising technology for utilizing high moisture content Biomass, but reactor plugging is a critical problem when feedstocks with high Biomass content are gasified. The objective of this paper is to prevent the plugging problem by studying the effects of the various parameters on Biomass Gasification in supercritical water. These parameters include pressure, temperature, residence time, reactor geometrical configuration, reactor types, heating rate, reactor wall properties, Biomass types, Biomass particle size, catalysts and solution concentration. Biomass model compounds (glucose, cellulose) and real Biomass are used in this work. All the Biomasses have been successfully gasified and the product gas is composed of hydrogen, carbon dioxide, methane, carbon monoxide and a small amount of ethane and ethylene. The results show that the gas yield of Biomass Gasification in supercritical water is sensitive to some of the parameters and the ways of reducing reactor plugging are obtained.

Ximin Zhang - One of the best experts on this subject based on the ideXlab platform.

  • hydrogen production by Biomass Gasification in supercritical water with a fluidized bed reactor
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Hui Jin, Liejin Guo, Ximin Zhang, Changqing Cao, Xu Guo
    Abstract:

    Abstract Hydrogen production by Biomass Gasification in supercritical water (SCW) is a promising technology for utilizing high moisture content Biomass, but reactor plugging is a critical problem for Biomass Gasification in the tubular reactor. A novel SCW fluidized bed system for Biomass Gasification was developed successfully in State Key Laboratory of Multiphase Flow in Power Engineering (SKLMF) to prevent the plugging and it was designed for the temperature up to 923 K and the pressure up to 30 MPa. Model compound (glucose) and real Biomass (corn cob) were gasified under SCW conditions to generate hydrogen-rich fuel gas and a performance testing of the new SCW fluidized bed system was conducted. The product gas composed of H2, CH4, CO2, CO and small amount of C2H4 and C2H6 was obtained. The effects of solution concentration, temperature, pressure and oxidant concentration on Gasification were studied. 30 wt% glucose and 18 wt% corn cob feedstocks were continually and stably gasified and reactor plugging was not observed. The results showed that using fluidized bed reactor for Biomass Gasification in SCW has many advantages and good prospects.

  • thermodynamic modeling and analysis of Biomass Gasification for hydrogen production in supercritical water
    Chemical Engineering Journal, 2007
    Co-Authors: Liejin Guo, Ximin Zhang, Qiuhui Yan
    Abstract:

    Abstract Biomass Gasification in supercritical water is a promising technology for hydrogen production by utilizing wet Biomass. A new experimental system of Biomass Gasification in supercritical water was built in SKLMF. In this paper, a comprehensive thermodynamic analysis, including chemical equilibrium in the reactor, gas–liquid equilibrium in the high-pressure separator, exergy and energy analysis of the whole system, was conducted. Chemical equilibrium model is based on minimizing Gibbs free energy. By chemical equilibrium analysis in the reactor, rules of the main parametric effects on Biomass Gasification in supercritical water are obtained. Simultaneously, a high-pressure gas–liquid equilibrium model was proposed based on modified universal functional activity coefficient (UNIFAC) model, Soave–Redlich–Kwong (SRK) equation of state and modified Huron–Vidal second-order (MHV2) mixing rule. Effects of pressure, temperature and water recycled ratio on gas–liquid equilibrium in high-pressure separation were discussed. Finally, results from energy and exergy analysis show that energy and exergy efficiencies of the whole system are in excess of 40% and increase with increasing heat transfer efficiencies. Energy loss of the system is caused mainly by heat transfer and exergy loss is mainly caused by heat transfer and chemical reaction. Our research provided a thermodynamic tool for improvement of design and operation optimization of Biomass Gasification system in SKLMF, which may be also applicable to other Biomass Gasification system.

  • hydrogen production by Biomass Gasification in supercritical water a parametric study
    International Journal of Hydrogen Energy, 2006
    Co-Authors: Liejin Guo, Ximin Zhang, Xiaohong Hao, Qiuhui Yan
    Abstract:

    Hydrogen production by Biomass Gasification in supercritical water is a promising technology for utilizing high moisture content Biomass, but reactor plugging is a critical problem when feedstocks with high Biomass content are gasified. The objective of this paper is to prevent the plugging problem by studying the effects of the various parameters on Biomass Gasification in supercritical water. These parameters include pressure, temperature, residence time, reactor geometrical configuration, reactor types, heating rate, reactor wall properties, Biomass types, Biomass particle size, catalysts and solution concentration. Biomass model compounds (glucose, cellulose) and real Biomass are used in this work. All the Biomasses have been successfully gasified and the product gas is composed of hydrogen, carbon dioxide, methane, carbon monoxide and a small amount of ethane and ethylene. The results show that the gas yield of Biomass Gasification in supercritical water is sensitive to some of the parameters and the ways of reducing reactor plugging are obtained.

Wang Zhen - One of the best experts on this subject based on the ideXlab platform.

  • Modeling of Biomass Gasification Process Based on Least Squares SVM
    Computer Simulation, 2009
    Co-Authors: Wang Zhen
    Abstract:

    The main purpose of the Biomass Gasification process is to obtain high-quality flammable gas as much as possible. At present, there are still many unresolved issues on Biomass Gasification process, such as Gasification temperature, Gasification of equivalence ratio, Gasification efficiency, Lower Heating Value, and other parameters optimization problems. For this reason, it is practical to establish a Gasification computation model which adapts to the Biomass Gasification process so as to forecast gas component of Biomass Gasification, Lower Heating Value, Gasification efficiency, carbon conversion efficiency and other indicators of Biomass Gasification. A preliminary model was put forward based on Least Squares SVM by analyzing the present Biomass Gasification process. The corresponding system structure and algorithm were given, and the genetic algorithms were investigated to select the parameters of LS-SVM models. The model was verified by experimental data, and good results were obtained.

  • A Study on the Biomass Gasification Process Model Based on Least Squares SVM
    Energy Conservation Technology, 2008
    Co-Authors: Wang Zhen
    Abstract:

    The final purpose of the Biomass Gasification progress is to obtain high-quality flammable gas as much as possible.At present,there are still many unresolved problems on Biomass Gasification progress,such as Gasification temperature,Gasification of equivalence ratio,Gasification efficiency,lower heating value,and other parameters optimization problems.Forthis reason,it is practical to establish a Gasification computation model which adapts to the Biomass Gasification progress so as to forecast gas components of Biomass,lower heating value,Gasification efficiency,carbon conversion efficiency and other indicators of Biomass Gasification.The paper puts forward a preliminary support vector machines model which is based on least squares SVM by analyzing the present Biomass Gasification process.We also discuss its feasibility on Biomass Gasification process and main parameters optimization.

Dino Musmarra - One of the best experts on this subject based on the ideXlab platform.

  • Biofuels Production by Biomass Gasification: A Review
    Energies, 2018
    Co-Authors: Antonio Molino, Simeone Chianese, Vincenzo Larocca, Dino Musmarra
    Abstract:

    The production of biofuels from renewable sources is a major challenge in research. Methanol, ethanol, dimethyl ether (DME), synthetic natural gas (SNG), and hydrogen can be produced from syngas which is the result of the Gasification of Biomasses. Syngas composition varies according to the Gasification technology used (such as fixed bed reactors, fluidized bed reactors, entrained flow reactors), the feedstock characteristics, and the operating parameters. This paper presents a review of the predominant Biomass Gasification technologies and biofuels obtained from syngas by Biomass Gasification.

  • Biomass Gasification technology: The state of the art overview
    Journal of Energy Chemistry, 2016
    Co-Authors: Antonio Molino, Simeone Chianese, Dino Musmarra
    Abstract:

    In the last decades the interest in the Biomass Gasification process has increased due to the growing attention to the use of sustainable energy. Biomass is a renewable energy source and represents a valid alternative to fossil fuels. Gasification is the thermochemical conversion of an organic material into a valuable gaseous product, called syngas, and a solid product, called char. The Biomass Gasification represents an efficient process for the production of power and heat and the production of hydrogen and second-generation biofuels. This paper deals with the state of the art Biomass Gasification technologies, evaluating advantages and disadvantages, the potential use of the syngas and the application of the Biomass Gasification. Syngas cleaning though fundamental to evaluate any Gasification technology is not included in this paper since; in the authors' opinion, a dedicated review is necessary.