The Experts below are selected from a list of 111 Experts worldwide ranked by ideXlab platform

Martin Olazar - One of the best experts on this subject based on the ideXlab platform.

  • New operation regimes in fountain confined conical spouted beds
    Chemical Engineering Science, 2020
    Co-Authors: Mikel Tellabide, Haritz Altzibar, Roberto Aguado, Idoia Estiati, Aitor Pablos, Martin Olazar
    Abstract:

    Abstract The spouted bed regime is an alternative to fixed and fluidized beds due to the excellent gas-solid contact and the high reduction in Operating Pressure Drop. Nevertheless, the most important limitation of this technology lies in its scaling up, since the inlet diameter/particle diameter ratio must be below 20–30 to avoid bed instability. In order to overcome this limitation, a new internal device called fountain confiner has been developed, which stabilises the system and allows Operating with fine particles even without any type of draft tube. Runs have been carried out using the fountain confiner in order to analyse the stability of beds composed of very fine particles and the characteristic hydrodynamic curves (Pressure Drop vs. air velocity) have been obtained. The use of this new device allows attaining highly stable operation regimes, widening the operational range to 4 times that of plain spouted beds, and increasing the inlet diameter/particle diameter ratio from 20–30 to 1000. Moreover, the optimum distance between the bed surface and the lower end of the confiner has been delimited for the range of Operating conditions studied, 0.06 - 0.08 m (between 1 / 2 and 1 / 3 the confiner diameter), since it is a key parameter for system stability. Finally, the effect of several geometric factors and the scaling up of this technology has been analysed for fine particles of different size and density.

  • Fine particle entrainment in fountain confined conical spouted beds
    Powder Technology, 2019
    Co-Authors: Idoia Estiati, Haritz Altzibar, Mikel Tellabide, Juan F. Saldarriaga, Martin Olazar
    Abstract:

    Abstract Many applications of the conical spouted beds involve operations using coarse and fine particle mixtures, which require high gas velocities due to the coarse particles, thereby leading to fine particle entrainment. In order to avoid entrainment, a new device has been proposed to confine the fountain. Thus, a study has been conducted on the influence the geometry and configuration of both confiner and draft tube have on particle entrainment, Operating Pressure Drop, Operating air flow rate and maximum cycle time. The results show that the fountain confiner greatly stabilises the operation and significantly reduces (above 50%) particle entrainment, but its influence on the other parameters is of rather low significance. Furthermore, the distance between the lower end of the device and the bed surface has a great impact on the performance of the spouted bed regime. Entrainment monitoring throughout time showed that its rate depends on the configuration, but remains constant with time.

  • Operating and Peak Pressure Drops in Conical Spouted Beds Equipped with Draft Tubes of Different Configuration
    Industrial & Engineering Chemistry Research, 2013
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Javier Bilbao, Martin Olazar
    Abstract:

    Operating and peak Pressure Drops have been studied in conical spouted beds equipped with draft tubes of different configuration using materials of different size. The draft tubes used are nonporous and open-sided ones. Based on an experimental design, the factors of greater influence on both Pressure Drops have been determined and general correlations valid for fine and coarse materials have been proposed for predicting the Operating Pressure Drop and peak Pressure Drop with each type of draft tube. The results show that conical spouted beds equipped with draft tubes give way to lower Operating and peak Pressure Drops than those without draft tube. A comparison of draft tube systems reveals that nonporous tubes give way to the lowest values of both Pressure Drops, but the solid circulation rates and the gas–solid contact efficiency are poorer than those with open-sided draft tube systems.

  • Effect of draft tube geometry on Pressure Drop in draft tube conical spouted beds
    Canadian Journal of Chemical Engineering, 2013
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Javier Bilbao, Martin Olazar
    Abstract:

    A hydrodynamic study of conical spouted beds equipped with draft tubes of different configurations have been carried out for fine and coarse particles belonging to Geldart groups D and B, respectively. The draft tubes used are conventional non-porous tubes and open-sided tubes, and runs have been carried out following a design of experiments in order to ascertain the effect of the draft tube geometry on the Operating Pressure Drop and peak Pressure Drop. Furthermore, runs have been carried out without tubes to compare the results obtained with those obtained with the two types of tubes. The results evidence that the geometry of the draft tube influences the Operating Pressure Drop and especially the peak Pressure Drop and, therefore, the hydrodynamics of conical spouted beds.

  • Hydrodynamics of Conical Spouted Beds Using Different Types of Internal Devices
    Chemical Engineering & Technology, 2009
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Sonia Alvarez, M.j. San José, Roberto Aguado, Martin Olazar
    Abstract:

    The hydrodynamics and performance of conical spouted beds provided with different types of draft-tubes have been studied for the treatment of fine particles. Correlations for calculation of the minimum spouting velocity, Operating Pressure Drop, and peak Pressure Drop have been developed as a function of dimensionless moduli that take into account the geometric factors, particle characteristics, and Operating conditions. A statistical analysis of the data obtained following a design of experiments shows that the height of the entrainment zone is highly significant in the nonporous draft-tubes, whereas the stagnant bed height is the counterpart in the open-sided draft-tubes.

Haritz Altzibar - One of the best experts on this subject based on the ideXlab platform.

  • New operation regimes in fountain confined conical spouted beds
    Chemical Engineering Science, 2020
    Co-Authors: Mikel Tellabide, Haritz Altzibar, Roberto Aguado, Idoia Estiati, Aitor Pablos, Martin Olazar
    Abstract:

    Abstract The spouted bed regime is an alternative to fixed and fluidized beds due to the excellent gas-solid contact and the high reduction in Operating Pressure Drop. Nevertheless, the most important limitation of this technology lies in its scaling up, since the inlet diameter/particle diameter ratio must be below 20–30 to avoid bed instability. In order to overcome this limitation, a new internal device called fountain confiner has been developed, which stabilises the system and allows Operating with fine particles even without any type of draft tube. Runs have been carried out using the fountain confiner in order to analyse the stability of beds composed of very fine particles and the characteristic hydrodynamic curves (Pressure Drop vs. air velocity) have been obtained. The use of this new device allows attaining highly stable operation regimes, widening the operational range to 4 times that of plain spouted beds, and increasing the inlet diameter/particle diameter ratio from 20–30 to 1000. Moreover, the optimum distance between the bed surface and the lower end of the confiner has been delimited for the range of Operating conditions studied, 0.06 - 0.08 m (between 1 / 2 and 1 / 3 the confiner diameter), since it is a key parameter for system stability. Finally, the effect of several geometric factors and the scaling up of this technology has been analysed for fine particles of different size and density.

  • Fine particle entrainment in fountain confined conical spouted beds
    Powder Technology, 2019
    Co-Authors: Idoia Estiati, Haritz Altzibar, Mikel Tellabide, Juan F. Saldarriaga, Martin Olazar
    Abstract:

    Abstract Many applications of the conical spouted beds involve operations using coarse and fine particle mixtures, which require high gas velocities due to the coarse particles, thereby leading to fine particle entrainment. In order to avoid entrainment, a new device has been proposed to confine the fountain. Thus, a study has been conducted on the influence the geometry and configuration of both confiner and draft tube have on particle entrainment, Operating Pressure Drop, Operating air flow rate and maximum cycle time. The results show that the fountain confiner greatly stabilises the operation and significantly reduces (above 50%) particle entrainment, but its influence on the other parameters is of rather low significance. Furthermore, the distance between the lower end of the device and the bed surface has a great impact on the performance of the spouted bed regime. Entrainment monitoring throughout time showed that its rate depends on the configuration, but remains constant with time.

  • Operating and Peak Pressure Drops in Conical Spouted Beds Equipped with Draft Tubes of Different Configuration
    Industrial & Engineering Chemistry Research, 2013
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Javier Bilbao, Martin Olazar
    Abstract:

    Operating and peak Pressure Drops have been studied in conical spouted beds equipped with draft tubes of different configuration using materials of different size. The draft tubes used are nonporous and open-sided ones. Based on an experimental design, the factors of greater influence on both Pressure Drops have been determined and general correlations valid for fine and coarse materials have been proposed for predicting the Operating Pressure Drop and peak Pressure Drop with each type of draft tube. The results show that conical spouted beds equipped with draft tubes give way to lower Operating and peak Pressure Drops than those without draft tube. A comparison of draft tube systems reveals that nonporous tubes give way to the lowest values of both Pressure Drops, but the solid circulation rates and the gas–solid contact efficiency are poorer than those with open-sided draft tube systems.

  • Effect of draft tube geometry on Pressure Drop in draft tube conical spouted beds
    Canadian Journal of Chemical Engineering, 2013
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Javier Bilbao, Martin Olazar
    Abstract:

    A hydrodynamic study of conical spouted beds equipped with draft tubes of different configurations have been carried out for fine and coarse particles belonging to Geldart groups D and B, respectively. The draft tubes used are conventional non-porous tubes and open-sided tubes, and runs have been carried out following a design of experiments in order to ascertain the effect of the draft tube geometry on the Operating Pressure Drop and peak Pressure Drop. Furthermore, runs have been carried out without tubes to compare the results obtained with those obtained with the two types of tubes. The results evidence that the geometry of the draft tube influences the Operating Pressure Drop and especially the peak Pressure Drop and, therefore, the hydrodynamics of conical spouted beds.

  • Hydrodynamics of Conical Spouted Beds Using Different Types of Internal Devices
    Chemical Engineering & Technology, 2009
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Sonia Alvarez, M.j. San José, Roberto Aguado, Martin Olazar
    Abstract:

    The hydrodynamics and performance of conical spouted beds provided with different types of draft-tubes have been studied for the treatment of fine particles. Correlations for calculation of the minimum spouting velocity, Operating Pressure Drop, and peak Pressure Drop have been developed as a function of dimensionless moduli that take into account the geometric factors, particle characteristics, and Operating conditions. A statistical analysis of the data obtained following a design of experiments shows that the height of the entrainment zone is highly significant in the nonporous draft-tubes, whereas the stagnant bed height is the counterpart in the open-sided draft-tubes.

Javier Bilbao - One of the best experts on this subject based on the ideXlab platform.

  • Operating and Peak Pressure Drops in Conical Spouted Beds Equipped with Draft Tubes of Different Configuration
    Industrial & Engineering Chemistry Research, 2013
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Javier Bilbao, Martin Olazar
    Abstract:

    Operating and peak Pressure Drops have been studied in conical spouted beds equipped with draft tubes of different configuration using materials of different size. The draft tubes used are nonporous and open-sided ones. Based on an experimental design, the factors of greater influence on both Pressure Drops have been determined and general correlations valid for fine and coarse materials have been proposed for predicting the Operating Pressure Drop and peak Pressure Drop with each type of draft tube. The results show that conical spouted beds equipped with draft tubes give way to lower Operating and peak Pressure Drops than those without draft tube. A comparison of draft tube systems reveals that nonporous tubes give way to the lowest values of both Pressure Drops, but the solid circulation rates and the gas–solid contact efficiency are poorer than those with open-sided draft tube systems.

  • Effect of draft tube geometry on Pressure Drop in draft tube conical spouted beds
    Canadian Journal of Chemical Engineering, 2013
    Co-Authors: Haritz Altzibar, Gartzen Lopez, Javier Bilbao, Martin Olazar
    Abstract:

    A hydrodynamic study of conical spouted beds equipped with draft tubes of different configurations have been carried out for fine and coarse particles belonging to Geldart groups D and B, respectively. The draft tubes used are conventional non-porous tubes and open-sided tubes, and runs have been carried out following a design of experiments in order to ascertain the effect of the draft tube geometry on the Operating Pressure Drop and peak Pressure Drop. Furthermore, runs have been carried out without tubes to compare the results obtained with those obtained with the two types of tubes. The results evidence that the geometry of the draft tube influences the Operating Pressure Drop and especially the peak Pressure Drop and, therefore, the hydrodynamics of conical spouted beds.

  • Hydrodynamic Aspects and Correlations for the Design of Draft-Tube Conical Spouted Beds
    2007
    Co-Authors: Haritz Altzibar, Javier Bilbao, Sonia Alvarez, M.j. San José, Roberto Aguado, Martin Olazar
    Abstract:

    A study has been carried out on the hydrodynamics of conical spouted beds with draft tube. Correlations have been proposed for calculating minimum spouting velocity, Operating Pressure Drop and peak Pressure Drop as functions of dimensionless module that take into account geometric factors, particle characteristics and Operating conditions.

  • Design of Conical Spouted Beds for the Handling of Low-Density Solids
    Industrial & Engineering Chemistry Research, 2004
    Co-Authors: Martin Olazar, Sonia Alvarez, M.j. San José, A. Morales, Javier Bilbao
    Abstract:

    A study has been carried on the applicability of correlations previously proposed for the design of conical spouted beds, for the treatment of materials of density similar to that of glass, and for the handling of plastic materials (polyethylene, polypropylene, and extruded and expanded polystyrene). The correlations proposed allow for calculation of the geometric factors (angle and design of the base) of conical spouted beds for stable operation, the minimum velocity for spouting and dilute spouting, the Operating Pressure Drop in both regimes, the peak Pressure, the bed voidage, and the evolution of this voidage as the gas velocity is increased between the regimes of a spouted bed and a dilute spouted bed.

  • Influence of the conical section geometry on the hydrodynamics of shallow spouted beds
    The Chemical Engineering Journal and the Biochemical Engineering Journal, 1996
    Co-Authors: M.j. San José, Martin Olazar, Roberto Aguado, Javier Bilbao
    Abstract:

    Abstract The hydrodynamics of shallow spouted beds and a comparison with the hydrodynamics of conventional spouted beds were studied on a pilot plant scale unit by Operating under a wide range of geometric characteristics of the contractor—particle system (base angle, inlet diameter to contactor base diameter ratio, inlet diameter to particle diameter ratio, inlet diameter to column diameter ratio); the ranges of these parameters in which stable operation is possible were delimited. The peculiar hydrodynamic behaviour of shallow spouted beds is attributed to the influence of the conical section of the base, which is an important fraction of the bed. Assuming that the shallow spouted beds are made up of the conical section of the base and the posterior cylindrical section, correlations are proposed for the calculation of the minimum spouting velocity, maximum Pressure Drop of the bed, Operating Pressure Drop and the bed voidage corresponding to minimum spouting in shallow spouted beds; these are a combination of the correlations proposed in previous papers for totally conical and totally cylindrical contactors.

Mikel Tellabide - One of the best experts on this subject based on the ideXlab platform.

  • New operation regimes in fountain confined conical spouted beds
    Chemical Engineering Science, 2020
    Co-Authors: Mikel Tellabide, Haritz Altzibar, Roberto Aguado, Idoia Estiati, Aitor Pablos, Martin Olazar
    Abstract:

    Abstract The spouted bed regime is an alternative to fixed and fluidized beds due to the excellent gas-solid contact and the high reduction in Operating Pressure Drop. Nevertheless, the most important limitation of this technology lies in its scaling up, since the inlet diameter/particle diameter ratio must be below 20–30 to avoid bed instability. In order to overcome this limitation, a new internal device called fountain confiner has been developed, which stabilises the system and allows Operating with fine particles even without any type of draft tube. Runs have been carried out using the fountain confiner in order to analyse the stability of beds composed of very fine particles and the characteristic hydrodynamic curves (Pressure Drop vs. air velocity) have been obtained. The use of this new device allows attaining highly stable operation regimes, widening the operational range to 4 times that of plain spouted beds, and increasing the inlet diameter/particle diameter ratio from 20–30 to 1000. Moreover, the optimum distance between the bed surface and the lower end of the confiner has been delimited for the range of Operating conditions studied, 0.06 - 0.08 m (between 1 / 2 and 1 / 3 the confiner diameter), since it is a key parameter for system stability. Finally, the effect of several geometric factors and the scaling up of this technology has been analysed for fine particles of different size and density.

  • Fine particle entrainment in fountain confined conical spouted beds
    Powder Technology, 2019
    Co-Authors: Idoia Estiati, Haritz Altzibar, Mikel Tellabide, Juan F. Saldarriaga, Martin Olazar
    Abstract:

    Abstract Many applications of the conical spouted beds involve operations using coarse and fine particle mixtures, which require high gas velocities due to the coarse particles, thereby leading to fine particle entrainment. In order to avoid entrainment, a new device has been proposed to confine the fountain. Thus, a study has been conducted on the influence the geometry and configuration of both confiner and draft tube have on particle entrainment, Operating Pressure Drop, Operating air flow rate and maximum cycle time. The results show that the fountain confiner greatly stabilises the operation and significantly reduces (above 50%) particle entrainment, but its influence on the other parameters is of rather low significance. Furthermore, the distance between the lower end of the device and the bed surface has a great impact on the performance of the spouted bed regime. Entrainment monitoring throughout time showed that its rate depends on the configuration, but remains constant with time.

Idoia Estiati - One of the best experts on this subject based on the ideXlab platform.

  • New operation regimes in fountain confined conical spouted beds
    Chemical Engineering Science, 2020
    Co-Authors: Mikel Tellabide, Haritz Altzibar, Roberto Aguado, Idoia Estiati, Aitor Pablos, Martin Olazar
    Abstract:

    Abstract The spouted bed regime is an alternative to fixed and fluidized beds due to the excellent gas-solid contact and the high reduction in Operating Pressure Drop. Nevertheless, the most important limitation of this technology lies in its scaling up, since the inlet diameter/particle diameter ratio must be below 20–30 to avoid bed instability. In order to overcome this limitation, a new internal device called fountain confiner has been developed, which stabilises the system and allows Operating with fine particles even without any type of draft tube. Runs have been carried out using the fountain confiner in order to analyse the stability of beds composed of very fine particles and the characteristic hydrodynamic curves (Pressure Drop vs. air velocity) have been obtained. The use of this new device allows attaining highly stable operation regimes, widening the operational range to 4 times that of plain spouted beds, and increasing the inlet diameter/particle diameter ratio from 20–30 to 1000. Moreover, the optimum distance between the bed surface and the lower end of the confiner has been delimited for the range of Operating conditions studied, 0.06 - 0.08 m (between 1 / 2 and 1 / 3 the confiner diameter), since it is a key parameter for system stability. Finally, the effect of several geometric factors and the scaling up of this technology has been analysed for fine particles of different size and density.

  • Fine particle entrainment in fountain confined conical spouted beds
    Powder Technology, 2019
    Co-Authors: Idoia Estiati, Haritz Altzibar, Mikel Tellabide, Juan F. Saldarriaga, Martin Olazar
    Abstract:

    Abstract Many applications of the conical spouted beds involve operations using coarse and fine particle mixtures, which require high gas velocities due to the coarse particles, thereby leading to fine particle entrainment. In order to avoid entrainment, a new device has been proposed to confine the fountain. Thus, a study has been conducted on the influence the geometry and configuration of both confiner and draft tube have on particle entrainment, Operating Pressure Drop, Operating air flow rate and maximum cycle time. The results show that the fountain confiner greatly stabilises the operation and significantly reduces (above 50%) particle entrainment, but its influence on the other parameters is of rather low significance. Furthermore, the distance between the lower end of the device and the bed surface has a great impact on the performance of the spouted bed regime. Entrainment monitoring throughout time showed that its rate depends on the configuration, but remains constant with time.