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Yong Kang - One of the best experts on this subject based on the ideXlab platform.

  • solid circulation and gas bypassing characteristics in a square internally circulating fluidized bed with Draft Tube
    Chemical Engineering and Processing, 2008
    Co-Authors: Jin Hee Jeon, Yong Kang
    Abstract:

    Abstract The effects of gas velocities to Draft Tube (26.64–52.54 cm/s) and to annulus section (8.14–11.84 cm/s) on solid circulation rate and gas bypassing fractions were determined in a square internally circulating fluidized bed reactor with an orifice-type square Draft Tube. The solid circulation rate and gas bypassing fraction from the annulus section to the Draft Tube increase but gas bypassing fraction from the Draft Tube to the annulus section decreases with increasing gas velocity to the Draft Tube. With increasing gas velocity to the annulus section, the solid circulation rate and gas bypassing fraction from the Draft Tube to the annulus section increase but, gas bypassing fraction from the annulus section to the Draft Tube decreases. The solids circulation rate was correlated with the pressure drop across the orifice and the opening area ratio based on the orifice theory. The gas bypassing fraction was correlated with gas velocities to the fluidized and the moving beds. Based on the gas bypassing fraction data, the gas flow rates across the orifice were correlated with gas velocities to the fluidized and the moving beds, opening area ratio, particle size and solids height in the bed.

  • Solid circulation and gas bypassing characteristics in a square internally circulating fluidized bed with Draft Tube
    Chemical Engineering and Processing: Process Intensification, 2008
    Co-Authors: Jin Hee Jeon, Seung Jae Kim, Sang Done Kim, Yong Kang
    Abstract:

    The effects of gas velocities to Draft Tube (26.64-52.54 cm/s) and to annulus section (8.14-11.84 cm/s) on solid circulation rate and gas bypassing fractions were determined in a square internally circulating fluidized bed reactor with an orifice-type square Draft Tube. The solid circulation rate and gas bypassing fraction from the annulus section to the Draft Tube increase but gas bypassing fraction from the Draft Tube to the annulus section decreases with increasing gas velocity to the Draft Tube. With increasing gas velocity to the annulus section, the solid circulation rate and gas bypassing fraction from the Draft Tube to the annulus section increase but, gas bypassing fraction from the annulus section to the Draft Tube decreases. The solids circulation rate was correlated with the pressure drop across the orifice and the opening area ratio based on the orifice theory. The gas bypassing fraction was correlated with gas velocities to the fluidized and the moving beds. Based on the gas bypassing fraction data, the gas flow rates across the orifice were correlated with gas velocities to the fluidized and the moving beds, opening area ratio, particle size and solids height in the bed. ?? 2008 Elsevier B.V. All rights reserved.

Sang Done Kim - One of the best experts on this subject based on the ideXlab platform.

  • Solid circulation and gas bypassing characteristics in a square internally circulating fluidized bed with Draft Tube
    Chemical Engineering and Processing: Process Intensification, 2008
    Co-Authors: Jin Hee Jeon, Seung Jae Kim, Sang Done Kim, Yong Kang
    Abstract:

    The effects of gas velocities to Draft Tube (26.64-52.54 cm/s) and to annulus section (8.14-11.84 cm/s) on solid circulation rate and gas bypassing fractions were determined in a square internally circulating fluidized bed reactor with an orifice-type square Draft Tube. The solid circulation rate and gas bypassing fraction from the annulus section to the Draft Tube increase but gas bypassing fraction from the Draft Tube to the annulus section decreases with increasing gas velocity to the Draft Tube. With increasing gas velocity to the annulus section, the solid circulation rate and gas bypassing fraction from the Draft Tube to the annulus section increase but, gas bypassing fraction from the annulus section to the Draft Tube decreases. The solids circulation rate was correlated with the pressure drop across the orifice and the opening area ratio based on the orifice theory. The gas bypassing fraction was correlated with gas velocities to the fluidized and the moving beds. Based on the gas bypassing fraction data, the gas flow rates across the orifice were correlated with gas velocities to the fluidized and the moving beds, opening area ratio, particle size and solids height in the bed. ?? 2008 Elsevier B.V. All rights reserved.

  • Circulation of solids and gas bypassing in an internally circulating fluidized bed with a Draft Tube
    Chemical Engineering Journal, 1997
    Co-Authors: BYUNG HO SONG, Young Tak Kim, Sang Done Kim
    Abstract:

    The effects of gas distributor, Draft lube height, gas velocity and gap height on the circulation rate of solids and gas bypassing between the Draft Tube and annulus sections have been determined in a circulating fluidized bed (internal diameter, 0.3 m: height, 2.5 m) with a Draft Tube (internal diameter, 0.1 m). Gas bypassing strongly depends on the type of gas distributor used for annulus aeration. Gas bypassing from the Draft Tube to the annulus decreases with increasing Draft Tube height. The circulation rate of solids is enhanced by gas bypassing from the annulus to the Draft Tube section regardless of the distributor type. A clinical plate distributor with luyeres is found to be the most suitable configuration for the circulation of solids in the circulating fluidized bed with a Draft Tube. The solids circulation rate obtained has been correlated with the pressure drop across the gap opening and the opening ratio using the orifice equation.

Jin Hee Jeon - One of the best experts on this subject based on the ideXlab platform.

  • solid circulation and gas bypassing characteristics in a square internally circulating fluidized bed with Draft Tube
    Chemical Engineering and Processing, 2008
    Co-Authors: Jin Hee Jeon, Yong Kang
    Abstract:

    Abstract The effects of gas velocities to Draft Tube (26.64–52.54 cm/s) and to annulus section (8.14–11.84 cm/s) on solid circulation rate and gas bypassing fractions were determined in a square internally circulating fluidized bed reactor with an orifice-type square Draft Tube. The solid circulation rate and gas bypassing fraction from the annulus section to the Draft Tube increase but gas bypassing fraction from the Draft Tube to the annulus section decreases with increasing gas velocity to the Draft Tube. With increasing gas velocity to the annulus section, the solid circulation rate and gas bypassing fraction from the Draft Tube to the annulus section increase but, gas bypassing fraction from the annulus section to the Draft Tube decreases. The solids circulation rate was correlated with the pressure drop across the orifice and the opening area ratio based on the orifice theory. The gas bypassing fraction was correlated with gas velocities to the fluidized and the moving beds. Based on the gas bypassing fraction data, the gas flow rates across the orifice were correlated with gas velocities to the fluidized and the moving beds, opening area ratio, particle size and solids height in the bed.

  • Solid circulation and gas bypassing characteristics in a square internally circulating fluidized bed with Draft Tube
    Chemical Engineering and Processing: Process Intensification, 2008
    Co-Authors: Jin Hee Jeon, Seung Jae Kim, Sang Done Kim, Yong Kang
    Abstract:

    The effects of gas velocities to Draft Tube (26.64-52.54 cm/s) and to annulus section (8.14-11.84 cm/s) on solid circulation rate and gas bypassing fractions were determined in a square internally circulating fluidized bed reactor with an orifice-type square Draft Tube. The solid circulation rate and gas bypassing fraction from the annulus section to the Draft Tube increase but gas bypassing fraction from the Draft Tube to the annulus section decreases with increasing gas velocity to the Draft Tube. With increasing gas velocity to the annulus section, the solid circulation rate and gas bypassing fraction from the Draft Tube to the annulus section increase but, gas bypassing fraction from the annulus section to the Draft Tube decreases. The solids circulation rate was correlated with the pressure drop across the orifice and the opening area ratio based on the orifice theory. The gas bypassing fraction was correlated with gas velocities to the fluidized and the moving beds. Based on the gas bypassing fraction data, the gas flow rates across the orifice were correlated with gas velocities to the fluidized and the moving beds, opening area ratio, particle size and solids height in the bed. ?? 2008 Elsevier B.V. All rights reserved.

BYUNG HO SONG - One of the best experts on this subject based on the ideXlab platform.

  • Solid Circulation and Gas Bypassing in an Internally Circulating Fluidized Bed with an Orifice-Type Draft Tube
    Korean Journal of Chemical Engineering, 1999
    Co-Authors: Sang-done Kimdg, BYUNG HO SONG
    Abstract:

    The effects of orifice diameter in the Draft Tube, particle size, gas velocities and bed height on the circulation rate of solids and gas bypassing between the Draft Tube and annulus have been determined in an internally circulating fluidized bed (i.d., 0.3 m ; height, 2.5 m) with an orifice-type Draft Tube. A conical shape gas separator has been employed above the Draft Tube to facilitate the separation of gases from the two beds. The circulation rate of solids and the quantity of gas bypass from the annulus to Draft Tube show their minimums when the static bed height is around the bottom of the separator. The circulation rate of solids increases with an increase in orifice diameter in the Draft Tube. At fixed aeration to the annulus, gas bypassing from the Draft Tube to annulus sections decreases, whereas reverse gas bypassing from the annulus to the Draft Tube increases with increasing the inlet gas velocity to the Draft Tube. The obtained solids circulation rate has been correlated by a relationship developed for the cocurrent flow of gas and solid through the orifice.

  • Circulation of solids and gas bypassing in an internally circulating fluidized bed with a Draft Tube
    Chemical Engineering Journal, 1997
    Co-Authors: BYUNG HO SONG, Young Tak Kim, Sang Done Kim
    Abstract:

    The effects of gas distributor, Draft lube height, gas velocity and gap height on the circulation rate of solids and gas bypassing between the Draft Tube and annulus sections have been determined in a circulating fluidized bed (internal diameter, 0.3 m: height, 2.5 m) with a Draft Tube (internal diameter, 0.1 m). Gas bypassing strongly depends on the type of gas distributor used for annulus aeration. Gas bypassing from the Draft Tube to the annulus decreases with increasing Draft Tube height. The circulation rate of solids is enhanced by gas bypassing from the annulus to the Draft Tube section regardless of the distributor type. A clinical plate distributor with luyeres is found to be the most suitable configuration for the circulation of solids in the circulating fluidized bed with a Draft Tube. The solids circulation rate obtained has been correlated with the pressure drop across the gap opening and the opening ratio using the orifice equation.

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

  • simulations of flow behavior of gas and particles in spouted bed with a porous Draft Tube
    Powder Technology, 2010
    Co-Authors: Wang Shuyan, Liu Yongjian, Liu Yikun, Wei Lixin, Wang Chunsheng
    Abstract:

    Abstract Flow behaviors of particles in a two-dimensional spouted bed with a porous Draft plates are studied using a fluid dynamic computation with kinetic–frictional stresses models. Gas flow through the porous Draft Tube is simulated by Brinkman–Darcy–Forchheimer formulation. The distributions of concentration and velocities of particles are predicted. Simulated results predict the solid circulation rate and gas flux rate measured in the spouted bed with a porous Draft Tube (Ishikura et al., 2003). The solid circulation rate in the spouted bed with a porous Draft Tube is larger than that with a non-porous Draft Tube. The predicted bed pressure drop with the porous Draft Tube is high in comparison to the spouted bed with non-porous Draft Tube. The effect of the porosity of the porous Draft Tube on distributions of gas flux rate through the annulus and solid circulation rate are discussed.

  • hydrodynamic simulations of gas solid spouted bed with a Draft Tube
    Chemical Engineering Science, 2010
    Co-Authors: Wang Shuyan, Liu Yikun, Wei Lixin, Hao Zhenghua, Wang Shuai
    Abstract:

    Abstract Flow behavior of particles in a two-dimensional spouted bed with a Draft Tube is studied using a continuous kinetic-friction stresses model. The kinetic stress of particles is predicted from kinetic theory of granular flow, while the friction stress is computed from a model proposed by Johnson et al. (1990) . A stitching function is used to smooth from the rapid shearing viscous regime to the slow shearing plastic regime. The distributions of concentration and velocities of particles are predicted in the spouted bed with a Draft Tube. Simulated results compare with the vertical velocity of particles ( Zhao et al., 2008 ) measured and in the spout bed with Draft plates and solid circulation rate ( Ishikura et al., 2003 ) measured in the spouted bed with a Draft Tube. The impact of the friction stress of particles on the spout, annulus, fountain and entrancement regions is analyzed in gas–solid spouted bed with a Draft Tube. Numerical results show that the gas flow rate through the annulus increases with the increase of the entrainment zone. The solids circulation rate decreases with the decrease of inlet gas velocity and the height of the entrainment zone. The effect of spouting gas velocity on distributions of concentration, velocity and particle circulation is discussed.