The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform

D. Ian Barnes - One of the best experts on this subject based on the ideXlab platform.

  • Understanding pulverised coal, biomass and waste combustion – A brief overview
    Applied Thermal Engineering, 2015
    Co-Authors: D. Ian Barnes
    Abstract:

    Pulverised coal (PC) firing has been the dominant technology for generating power in utility boilers for almost a century. During this period, boiler designs have evolved through an accumulating collection of knowledge that has led to many empirical relationships that still guide current and future design directions to some degree. In the late 1940s the developed nations began to undertake coal research based on scientific principles to ensure the most efficient use of the Primary Energy Resource represented by coal. As the body of scientific knowledge on the physics and chemistry of coal combustion grew, it was used to direct the improvements to efficiency required and, later, the control of pollutants produced during the combustion of coal. This involves not only the control of emissions of particulates, SOx and oxides of nitrogen but also of trace elements, polycyclic aromatic hydrocarbons and, importantly, CO2. There have been a number of significant developments in the coal-fired power generation sector including cofiring with secondary fuels, particularly biomass and waste, and the development of radically different combustion systems (for example, oxyfuel) to meet carbon capture and storage requirements. Each of these developments has impacted upon the way in which PC-fired boilers are configured and operated and further complicated an already complex combustion environment. This paper outlines the developments in PC combustion and the new techniques that have been developed to enhance our understanding of the processes involved. The paper is based on a comprehensive IEA Clean Coal Centre study “Understanding pulverised coal, biomass and waste combustion”. Ian Barnes, CCC/205 ISBN 978-92-9029-525-9, September 2012.

Ian D Barnes - One of the best experts on this subject based on the ideXlab platform.

  • understanding pulverised coal biomass and waste combustion a brief overview
    Applied Thermal Engineering, 2015
    Co-Authors: Ian D Barnes
    Abstract:

    Pulverised coal (PC) firing has been the dominant technology for generating power in utility boilers for almost a century. During this period, boiler designs have evolved through an accumulating collection of knowledge that has led to many empirical relationships that still guide current and future design directions to some degree. In the late 1940s the developed nations began to undertake coal research based on scientific principles to ensure the most efficient use of the Primary Energy Resource represented by coal. As the body of scientific knowledge on the physics and chemistry of coal combustion grew, it was used to direct the improvements to efficiency required and, later, the control of pollutants produced during the combustion of coal. This involves not only the control of emissions of particulates, SOx and oxides of nitrogen but also of trace elements, polycyclic aromatic hydrocarbons and, importantly, CO2. There have been a number of significant developments in the coal-fired power generation sector including cofiring with secondary fuels, particularly biomass and waste, and the development of radically different combustion systems (for example, oxyfuel) to meet carbon capture and storage requirements. Each of these developments has impacted upon the way in which PC-fired boilers are configured and operated and further complicated an already complex combustion environment. This paper outlines the developments in PC combustion and the new techniques that have been developed to enhance our understanding of the processes involved. The paper is based on a comprehensive IEA Clean Coal Centre study “Understanding pulverised coal, biomass and waste combustion”. Ian Barnes, CCC/205 ISBN 978-92-9029-525-9, September 2012.

Rami M. Younis - One of the best experts on this subject based on the ideXlab platform.

  • Numerical study of complex fracture geometries for unconventional gas reservoirs using a discrete fracture-matrix model
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Jiamin Jiang, Rami M. Younis
    Abstract:

    Abstract Unconventional gas reservoirs have become the focus of considerable attention as Primary Energy Resource over the past decades worldwide. Numerical modeling technique plays a critical role in providing the essential tools for evaluating, optimizing and managing the development of such complex systems. In this work, we implement a lower-dimensional discrete fracture and matrix (DFM) model in our previously established multi-continuum numerical simulator (Jiang and Younis, 2015) which incorporates several storage and transport mechanisms for unconventional gas reservoirs. The DFM model is based on unstructured gridding, and could handle the non-ideal geometries of hydraulic fracture in stimulated unconventional formation. Mimetic finite difference (MFD) method is applied to provide a consistent spatial discretization under the unstructured framework. We examine the effects of the irregular fracture pattern with multiple orientations on the production profile of multiple-fractured horizontal well in unconventional gas reservoir. High-fidelity numerical solutions are provided to simulate rate transient from several fracture topologies, and three-dimensional studies are performed for inclined fracture geometry.

  • A multimechanistic multicontinuum model for simulating shale gas reservoir with complex fractured system
    Fuel, 2015
    Co-Authors: Jiamin Jiang, Rami M. Younis
    Abstract:

    Abstract Unconventional shale gas reservoirs have become the focus of considerable attention as Primary Energy Resource over the past decades worldwide. Economic gas rate requires the creation of complex fracture networks which could be characterized by the stimulated reservoir volume (SRV) concept. Micro-seismic mapping technique could provide a measurement of the overall SRV and an estimate of the fracture patterns. Accurate and efficient numerical simulation of these reservoirs is challenging. There is substantial physical complexity involving a number of tightly coupled mechanisms in the modeling of gas production. The fabric of shale system with multicontinuum nature comprises organic material, inorganic matrix and natural fracture. The complexity is further amplified by the complex fracture networks with a wide range of fracture length scales and topologies. In this work, we develop a comprehensive physics-based, multicontinuum model to predict shale gas reservoir performance. The model is designed to incorporate the spectrum of known physics inherent in shale system, such as multiphase behavior, desorption, non-Darcy transport in ultra-tight porous media, high-velocity turbulent flow and rock un-consolidation within natural fractures. We also implement a novel hybrid fracture model (UDFM-MINC) that effectively integrates discrete fracture-matrix model (DFM) with continuum type of approach for simulating the multiscaled stimulated shale formations. Primary fractures are described using DFM with unstructured triangular grids (UDFM), and small-scale fractures are handled by the multiple interacting continua (MINC) model in a fully coupled manner. Optimized local grid refinement (LGR) technique is employed to accurately capture the transient flow regime around the Primary fractures. We discuss the numerical implementation for the developed model, and present simulation results to demonstrate the model applicability. We also conduct preliminary sensitivity studies to determine the key factors of reservoir and fracture that affect the production performance of unconventional gas wells.

Ken Nagasaka - One of the best experts on this subject based on the ideXlab platform.

  • Potential evaluation and long-run installation scheduling of offshore wind power of entire Japan
    2012
    Co-Authors: Asifujiang Abudureyimu, Yoshiki Hayashi, Ken Nagasaka
    Abstract:

    The off-shore wind Energy has been drawing interest recently. This research is focusing on the potential analysis of off-shore wind Energy surrounding entire Japan coast using GIS technology. Base on the economy and environment assessment, this research is evaluating the current situation and forecasting on future of wind Energy technology in Japan. In order to reduce the green-house gas emission, renewable Energy (such as wind Energy, solar Energy, fuel cell…) will gradually substitute can be installed the Primary Energy Resource (such as coal, oil, scale gas‥). Based on GIS technique, wind power turbines in the surrounding area of Japanese coast-line. In the study, 2000kW rated wind turbines are considered for further installation. As the result of this study, we have determined that 108,067 in 330 places number of off-shore with annual generation of 180.0TWhare expected. This is equal to 20% of annual total generated power of Japan in 2011. In this study, after determination of potential evaluation of offshore wind power for the entire Japan, we have applied a well-know Dynamic Programming (DP) method to propose a plan of installation of the above determined number of offshore wind power units from year 2012 to 2030 respectively. As far as we know, there is no such scheduling for introducing offshore wind power in Japan.

  • Off-shore wind power potential evaluation and economy analysis of entire Japan using GIS technology
    International Journal of Advanced Mechatronic Systems, 2012
    Co-Authors: Asifujiang Abudureyimu, Yoshiki Hayashi, Zulati Litifu, Ken Nagasaka
    Abstract:

    Off-shore wind Energy has been drawing interest recently. This research is focusing on the potential analysis of off-shore wind Energy surrounding entire Japan coast using GIS technology. Base on the economy and environment assessment, this research is evaluating the current situation and forecasting on future of wind Energy technology in Japan. In order to reduce the green-house gas emission, renewable Energy (such as wind Energy, solar Energy, fuel cell…) will gradually substitute can be installed the Primary Energy Resource (such as coal, oil, scale gas…). Based on GIS technique, wind power turbines in the surrounding area of Japanese coast-line. In the study, 2,000 kW rated wind turbines are considered for further installation. As the result of this study, we have determined that 108,067 in 330 places number of off-shore with annual generation of 180.0 TWh are expected. This is equal to 20% of annual total generated power of Japan in 2010. Wind speed 6 m/s or more of the coastline, the average cost of electricity is about generation cost is within 10 to 17 Japanese Yen/kWh and construction cost is within 139,445 Japanese Yen/kW to 240,366 Japanese Yen/kW.

  • Off-shore wind power potential evaluation of entire Japan using GIS technology
    2011
    Co-Authors: Asifujiang Abudureyimu, Yoshiki Hayashi, Ken Nagasaka
    Abstract:

    The off-shore wind Energy has been drawing interest recently. This research is focusing on the potential analysis of off-shore wind Energy surrounding entire Japan coast using GIS technology. Base on the economy and environment assessment, this research is evaluating the current situation and forecasting on future of wind Energy technology in Japan. In order to reduce the green-house gas emission, renewable Energy (such as wind Energy, solar Energy, fuel cell…) will gradually substitute can be installed the Primary Energy Resource (such as coal, oil, scale gas‥). Based on GIS technique, wind power turbines in the surrounding area of Japanese coast-line. In the study, 2000kW rated wind turbines are considered for further installation. As the result of this study, we have determined that 108,067 in 330 places number of off-shore with annual generation of 180.0 TWh are expected. This is equal to 20% of annual total generated power of Japan in 2010.

Jiamin Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Numerical study of complex fracture geometries for unconventional gas reservoirs using a discrete fracture-matrix model
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Jiamin Jiang, Rami M. Younis
    Abstract:

    Abstract Unconventional gas reservoirs have become the focus of considerable attention as Primary Energy Resource over the past decades worldwide. Numerical modeling technique plays a critical role in providing the essential tools for evaluating, optimizing and managing the development of such complex systems. In this work, we implement a lower-dimensional discrete fracture and matrix (DFM) model in our previously established multi-continuum numerical simulator (Jiang and Younis, 2015) which incorporates several storage and transport mechanisms for unconventional gas reservoirs. The DFM model is based on unstructured gridding, and could handle the non-ideal geometries of hydraulic fracture in stimulated unconventional formation. Mimetic finite difference (MFD) method is applied to provide a consistent spatial discretization under the unstructured framework. We examine the effects of the irregular fracture pattern with multiple orientations on the production profile of multiple-fractured horizontal well in unconventional gas reservoir. High-fidelity numerical solutions are provided to simulate rate transient from several fracture topologies, and three-dimensional studies are performed for inclined fracture geometry.

  • A multimechanistic multicontinuum model for simulating shale gas reservoir with complex fractured system
    Fuel, 2015
    Co-Authors: Jiamin Jiang, Rami M. Younis
    Abstract:

    Abstract Unconventional shale gas reservoirs have become the focus of considerable attention as Primary Energy Resource over the past decades worldwide. Economic gas rate requires the creation of complex fracture networks which could be characterized by the stimulated reservoir volume (SRV) concept. Micro-seismic mapping technique could provide a measurement of the overall SRV and an estimate of the fracture patterns. Accurate and efficient numerical simulation of these reservoirs is challenging. There is substantial physical complexity involving a number of tightly coupled mechanisms in the modeling of gas production. The fabric of shale system with multicontinuum nature comprises organic material, inorganic matrix and natural fracture. The complexity is further amplified by the complex fracture networks with a wide range of fracture length scales and topologies. In this work, we develop a comprehensive physics-based, multicontinuum model to predict shale gas reservoir performance. The model is designed to incorporate the spectrum of known physics inherent in shale system, such as multiphase behavior, desorption, non-Darcy transport in ultra-tight porous media, high-velocity turbulent flow and rock un-consolidation within natural fractures. We also implement a novel hybrid fracture model (UDFM-MINC) that effectively integrates discrete fracture-matrix model (DFM) with continuum type of approach for simulating the multiscaled stimulated shale formations. Primary fractures are described using DFM with unstructured triangular grids (UDFM), and small-scale fractures are handled by the multiple interacting continua (MINC) model in a fully coupled manner. Optimized local grid refinement (LGR) technique is employed to accurately capture the transient flow regime around the Primary fractures. We discuss the numerical implementation for the developed model, and present simulation results to demonstrate the model applicability. We also conduct preliminary sensitivity studies to determine the key factors of reservoir and fracture that affect the production performance of unconventional gas wells.