The Experts below are selected from a list of 1221 Experts worldwide ranked by ideXlab platform

Piotr Plaza - One of the best experts on this subject based on the ideXlab platform.

  • Use of a predictive model for the impact of cofiring coal/biomass blends on slagging and fouling propensity
    Energy & Fuels, 2009
    Co-Authors: Piotr Plaza, Anthony John Griffiths, Nicholas Syred, Thomas Rees-gralton
    Abstract:

    The paper describes an investigation of slagging and fouling effects when cofiring coal/biomass blends by using a predictive model for large utility boilers. This model is based on the use a zone computational method to determine the Midsection temperature profile throughout a boiler, coupled with a thermo-chemical model, to define and assess the risk of elevated slagging and fouling levels during cofiring of solid fuels. The application of this prediction tool was made for a 618 MW thermal wall-fired pulverized coal boiler, cofired with a typical medium volatile bituminous coal and two substitute fuels, sewage sludge and sawdust. Associated changes in boiler efficiency as well as various heat transfer and thermodynamic parameters of the system were analyzed with slagging and fouling effects for different cofiring ratios. The results of the modeling revealed that, for increased cofiring of sewage sludge, an elevated risk of slagging and high-temperature fouling occurred, in complete contrast to the effects occurring with the utilization of sawdust as a substitute fuel.

  • use of a predictive model for the impact of cofiring coal biomass blends on slagging and fouling propensity
    Energy & Fuels, 2009
    Co-Authors: Piotr Plaza, Anthony John Griffiths, Nicholas Syred, Thomas Reesgralton
    Abstract:

    The paper describes an investigation of slagging and fouling effects when cofiring coal/biomass blends by using a predictive model for large utility boilers. This model is based on the use a zone computational method to determine the Midsection temperature profile throughout a boiler, coupled with a thermo-chemical model, to define and assess the risk of elevated slagging and fouling levels during cofiring of solid fuels. The application of this prediction tool was made for a 618 MW thermal wall-fired pulverized coal boiler, cofired with a typical medium volatile bituminous coal and two substitute fuels, sewage sludge and sawdust. Associated changes in boiler efficiency as well as various heat transfer and thermodynamic parameters of the system were analyzed with slagging and fouling effects for different cofiring ratios. The results of the modeling revealed that, for increased cofiring of sewage sludge, an elevated risk of slagging and high-temperature fouling occurred, in complete contrast to the effects occurring with the utilization of sawdust as a substitute fuel.

Yi Deng - One of the best experts on this subject based on the ideXlab platform.

  • dynamics of upper level frontogenesis in baroclinic waves
    Journal of the Atmospheric Sciences, 2016
    Co-Authors: Yi Lu, Yi Deng
    Abstract:

    AbstractThis paper reports a diagnosis of the structure and dynamics of upper-level fronts (ULFs) simulated with a high-resolution Weather Research and Forecasting Model with diabatic heating versus one without diabatic heating. The ULFs of both simulations develop in about 6 days as integral parts of intensifying baroclinic waves. Each has a curvilinear structure along the southern edge of a relatively narrow long tongue of high potential vorticity in which stratospheric air is subducted to different tropospheric levels by synoptic-scale subsidence. It resembles a veil in the sky of varying thickness across the Midsection upstream of the trough of the baroclinic wave.The 3D frontogenetical function is shown to be a necessary and sufficient metric for quantifying the rate of development of ULFs. Its value is mostly associated with the contribution of the 3D ageostrophic velocity component. Upper-level frontogenesis is attributable to the joint direct influence of the vortex-stretching process and the defo...

  • dynamics of upper level frontogenesis in baroclinic waves
    Journal of the Atmospheric Sciences, 2016
    Co-Authors: Yi Lu, Yi Deng
    Abstract:

    AbstractThis paper reports a diagnosis of the structure and dynamics of upper-level fronts (ULFs) simulated with a high-resolution Weather Research and Forecasting Model with diabatic heating versus one without diabatic heating. The ULFs of both simulations develop in about 6 days as integral parts of intensifying baroclinic waves. Each has a curvilinear structure along the southern edge of a relatively narrow long tongue of high potential vorticity in which stratospheric air is subducted to different tropospheric levels by synoptic-scale subsidence. It resembles a veil in the sky of varying thickness across the Midsection upstream of the trough of the baroclinic wave.The 3D frontogenetical function is shown to be a necessary and sufficient metric for quantifying the rate of development of ULFs. Its value is mostly associated with the contribution of the 3D ageostrophic velocity component. Upper-level frontogenesis is attributable to the joint direct influence of the vortex-stretching process and the defo...

Eike Sebastian Debus - One of the best experts on this subject based on the ideXlab platform.

  • addressing persistent false lumen flow in chronic aortic dissection the knickerbocker technique
    Journal of Endovascular Therapy, 2014
    Co-Authors: Tilo Kolbel, Sebastian Carpenter, Christina Lohrenz, Nikolaos Tsilimparis, Axel Larenaavellaneda, Eike Sebastian Debus
    Abstract:

    PurposeTo describe an innovative technique to occlude distal backflow into a false lumen aneurysm by controlled rupture of the dissection membrane after stent-graft implantation.TechniqueThe “Knickerbocker technique” involves relining the true lumen in the descending aorta with an oversized thoracic tubular endograft, followed by controlled rupture of the dissection membrane using a large compliant balloon within the graft's Midsection. This maneuver, which allows expansion of the stent-graft's Midsection into the false lumen, was developed in order to occlude the large false lumen distally and thus prevent continued false lumen perfusion through distal abdominal entry tears. The technique has been successfully used in 3 patients with ruptured or symptomatic chronic false lumen aneurysm in type B aortic dissection. There was no short-term mortality associated with the procedure. After a mean follow-up of 8 months, the false lumen aneurysm remained thrombosed, with no mortality after a mean clinical follow...

Thomas Reesgralton - One of the best experts on this subject based on the ideXlab platform.

  • use of a predictive model for the impact of cofiring coal biomass blends on slagging and fouling propensity
    Energy & Fuels, 2009
    Co-Authors: Piotr Plaza, Anthony John Griffiths, Nicholas Syred, Thomas Reesgralton
    Abstract:

    The paper describes an investigation of slagging and fouling effects when cofiring coal/biomass blends by using a predictive model for large utility boilers. This model is based on the use a zone computational method to determine the Midsection temperature profile throughout a boiler, coupled with a thermo-chemical model, to define and assess the risk of elevated slagging and fouling levels during cofiring of solid fuels. The application of this prediction tool was made for a 618 MW thermal wall-fired pulverized coal boiler, cofired with a typical medium volatile bituminous coal and two substitute fuels, sewage sludge and sawdust. Associated changes in boiler efficiency as well as various heat transfer and thermodynamic parameters of the system were analyzed with slagging and fouling effects for different cofiring ratios. The results of the modeling revealed that, for increased cofiring of sewage sludge, an elevated risk of slagging and high-temperature fouling occurred, in complete contrast to the effects occurring with the utilization of sawdust as a substitute fuel.

Thomas Rees-gralton - One of the best experts on this subject based on the ideXlab platform.

  • Use of a predictive model for the impact of cofiring coal/biomass blends on slagging and fouling propensity
    Energy & Fuels, 2009
    Co-Authors: Piotr Plaza, Anthony John Griffiths, Nicholas Syred, Thomas Rees-gralton
    Abstract:

    The paper describes an investigation of slagging and fouling effects when cofiring coal/biomass blends by using a predictive model for large utility boilers. This model is based on the use a zone computational method to determine the Midsection temperature profile throughout a boiler, coupled with a thermo-chemical model, to define and assess the risk of elevated slagging and fouling levels during cofiring of solid fuels. The application of this prediction tool was made for a 618 MW thermal wall-fired pulverized coal boiler, cofired with a typical medium volatile bituminous coal and two substitute fuels, sewage sludge and sawdust. Associated changes in boiler efficiency as well as various heat transfer and thermodynamic parameters of the system were analyzed with slagging and fouling effects for different cofiring ratios. The results of the modeling revealed that, for increased cofiring of sewage sludge, an elevated risk of slagging and high-temperature fouling occurred, in complete contrast to the effects occurring with the utilization of sawdust as a substitute fuel.