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Paitoon Tontiwachwuthikul - One of the best experts on this subject based on the ideXlab platform.

  • effects of operating and design parameters on co2 absorption in columns with structured packings
    Separation and Purification Technology, 2001
    Co-Authors: Adisorn Aroonwilas, Paitoon Tontiwachwuthikul, Amit Chakma
    Abstract:

    This paper highlights the importance of operating and design parameters to mass-transfer in CO2 absorption in columns with structured packings. The study compares the performance of four stainless steel packings, Gempak 4A, Mellapak 500Y, Mellapak 500X, and Optiflow. Mass-transfer efficiency of these packings was determined by carrying out absorption experiments in a pilot-scale absorption unit with aqueous solutions of sodium hydroxide (NaOH) and monoethanolamine (MEA) as test Liquid. The overall mass-transfer coefficients (KGae) were calculated from experimentally determined gas-phase CO2 concentration profiles within the test columns. The results of this study indicate that mass-transfer coefficient of these structured packings tested varies significantly not only with operating parameters such as Liquid load, Liquid CO2 loading and Liquid Temperature but also with design parameters, i.e. the pattern of packing arrangement and initial Liquid distribution.

  • mechanistic model for prediction of structured packing mass transfer performance in co2 absorption with chemical reactions
    Chemical Engineering Science, 2000
    Co-Authors: Adisorn Aroonwilas, Paitoon Tontiwachwuthikul
    Abstract:

    Abstract A mechanistic model based on Liquid irrigation feature is proposed for predicting mass transfer performance of sheet-metal structured packings. The model was used to simulate mass transfer performance of Gempak 4A structured packings for CO 2 absorption using NaOH aqueous solutions. A very good agreement between the simulation results and the experimental data acquired from a pilot CO 2 absorption unit was found under ranges of process parameters including Liquid load, initial Liquid distribution pattern, and Liquid Temperature. In comparison with published mass transfer correlations, the proposed model can effectively handle the prediction in a wider range of the Liquid load.

  • Behavior of the Mass-Transfer Coefficient of Structured Packings in CO2 Absorbers with Chemical Reactions
    Industrial & Engineering Chemistry Research, 1999
    Co-Authors: Adisorn Aroonwilas, And Amornvadee Veawab, Paitoon Tontiwachwuthikul
    Abstract:

    The present study provides comprehensive experimental data on the performance of structured packings in CO2 absorption application. Over 90 runs of the absorption experiments were conducted in 3 different scale absorption units (laboratory-scale, pilot-scale, and industrial-scale units). The structured packings used in this study were Sulzer EX, Gempak 4A, and Sulzer BX. Aqueous solutions of sodium hydroxide (NaOH), monoethanolamine (MEA), and 2-amino-2-methyl-1-propanol (AMP) were employed as absorption solvents. The performance of the structured packings was evaluated in terms of the volumetric overall mass-transfer coefficient (KGav) as functions of the process operating parameters including gas load, CO2 partial pressure, Liquid load, Liquid Temperature, solvent concentration, solvent type, and structured packing type. To emphasize the superior performance of the structured packings, performance comparisons between the used structured packings and common random packings are also given.

Adisorn Aroonwilas - One of the best experts on this subject based on the ideXlab platform.

  • effects of operating and design parameters on co2 absorption in columns with structured packings
    Separation and Purification Technology, 2001
    Co-Authors: Adisorn Aroonwilas, Paitoon Tontiwachwuthikul, Amit Chakma
    Abstract:

    This paper highlights the importance of operating and design parameters to mass-transfer in CO2 absorption in columns with structured packings. The study compares the performance of four stainless steel packings, Gempak 4A, Mellapak 500Y, Mellapak 500X, and Optiflow. Mass-transfer efficiency of these packings was determined by carrying out absorption experiments in a pilot-scale absorption unit with aqueous solutions of sodium hydroxide (NaOH) and monoethanolamine (MEA) as test Liquid. The overall mass-transfer coefficients (KGae) were calculated from experimentally determined gas-phase CO2 concentration profiles within the test columns. The results of this study indicate that mass-transfer coefficient of these structured packings tested varies significantly not only with operating parameters such as Liquid load, Liquid CO2 loading and Liquid Temperature but also with design parameters, i.e. the pattern of packing arrangement and initial Liquid distribution.

  • mechanistic model for prediction of structured packing mass transfer performance in co2 absorption with chemical reactions
    Chemical Engineering Science, 2000
    Co-Authors: Adisorn Aroonwilas, Paitoon Tontiwachwuthikul
    Abstract:

    Abstract A mechanistic model based on Liquid irrigation feature is proposed for predicting mass transfer performance of sheet-metal structured packings. The model was used to simulate mass transfer performance of Gempak 4A structured packings for CO 2 absorption using NaOH aqueous solutions. A very good agreement between the simulation results and the experimental data acquired from a pilot CO 2 absorption unit was found under ranges of process parameters including Liquid load, initial Liquid distribution pattern, and Liquid Temperature. In comparison with published mass transfer correlations, the proposed model can effectively handle the prediction in a wider range of the Liquid load.

  • Behavior of the Mass-Transfer Coefficient of Structured Packings in CO2 Absorbers with Chemical Reactions
    Industrial & Engineering Chemistry Research, 1999
    Co-Authors: Adisorn Aroonwilas, And Amornvadee Veawab, Paitoon Tontiwachwuthikul
    Abstract:

    The present study provides comprehensive experimental data on the performance of structured packings in CO2 absorption application. Over 90 runs of the absorption experiments were conducted in 3 different scale absorption units (laboratory-scale, pilot-scale, and industrial-scale units). The structured packings used in this study were Sulzer EX, Gempak 4A, and Sulzer BX. Aqueous solutions of sodium hydroxide (NaOH), monoethanolamine (MEA), and 2-amino-2-methyl-1-propanol (AMP) were employed as absorption solvents. The performance of the structured packings was evaluated in terms of the volumetric overall mass-transfer coefficient (KGav) as functions of the process operating parameters including gas load, CO2 partial pressure, Liquid load, Liquid Temperature, solvent concentration, solvent type, and structured packing type. To emphasize the superior performance of the structured packings, performance comparisons between the used structured packings and common random packings are also given.

Oleg A. Kabov - One of the best experts on this subject based on the ideXlab platform.

  • evaporative convection in a horizontal Liquid layer under shear stress gas flow
    International Journal of Heat and Mass Transfer, 2014
    Co-Authors: Oleg A. Kabov, Yu V Lyulin
    Abstract:

    Abstract Experimental investigation of convective processes within horizontal evaporating Liquid layer under shear–stress of inert gas flow is presented. Average evaporation flow rate of HFE-7100 Liquid layer under Nitrogen gas flow is measured with the help of two independent methods. Influence of the gas velocity, the gas/Liquid Temperature and the Liquid depth on the evaporation flow rate has been studied. At increasing of the Liquid depth the average evaporation flow rate has a local maximum. With growth of the gas/Liquid Temperature from 20 °C to 40 °C the local maximum is shifted from 3 mm to 5 mm of the Liquid depth. Visualization and analysis of the flow patterns on the gas–Liquid interface have been performed. It is found out that the maximum evaporation flow rate is achieved at a stable and uniform convective flow within the Liquid layer in the direction opposite to the gas flow. The results reported in this paper is a contribution to the preparation of the experiment on the International Space Station in the frame of the scientific project “Convection and Interfacial Mass Exchange” (CIMEX) of the European Space Agency.

  • measurement of the evaporation mass flow rate in a horizontal Liquid layer partly opened into flowing gas
    Technical Physics Letters, 2013
    Co-Authors: Yu V Lyulin, Oleg A. Kabov
    Abstract:

    The dynamics of evaporation from a local surface of a horizontal Liquid layer under a gas flow is studied experimentally. The average evaporation mass flow rate of a Liquid layer (HFE-7100) induced by inert gas (nitrogen) is measured using two independent methods. The influence of the average gas flow rate, gas and Liquid Temperature, and the layer depth upon the evaporation rate and convection in the Liquid layer is investigated. Correlation dependences of the evaporation rate vs. the inert gas flow rate and Temperature are obtained. It is found that the average evaporation-rate curve has a local maximum with a growth of the Liquid layer depth. With the growth of the gas and Liquid Temperature, the local maximum in an evaporation flow rate of the Liquid layer is shifted to the larger value of the Liquid depth.

Monica Siroux - One of the best experts on this subject based on the ideXlab platform.

  • flash evaporation from a water pool influence of the Liquid height and of the depressurization rate
    International Journal of Thermal Sciences, 2005
    Co-Authors: Didier Saury, Souad Harmand, Monica Siroux
    Abstract:

    Abstract This article presents a study about the influence of the initial water height and of the depressurization rate on the flash evaporation of a water film. Experimental study is carried out with initial water height ranging from 25 to 250 mm, superheats between 2 and 44 K, and an initial Liquid Temperature from 45 to 85 °C. Visualization of the phenomenon using a CCD camera lets us firstly point out the influence of the initial water level on the flashing phenomenon in a qualitative way. Thermal balance allows us to correlate the mass evaporated with the Liquid Temperature, and then to quantify the influence of the initial water height on several parameters: maximal amplitude of the phenomenon, flashing time, Liquid mass evaporated. We also analyse influence of relatively low depressurization rate (from 0 to 3.5 bar⋅s−1) on the flashing time, the mass evaporated, and the mass flow rate. Finally, dimensionless correlations between these parameters are proposed.

  • flash evaporation from a water pool influence of the Liquid height and of the depressurization rate
    International Journal of Thermal Sciences, 2005
    Co-Authors: Didier Saury, Souad Harmand, Monica Siroux
    Abstract:

    Abstract This article presents a study about the influence of the initial water height and of the depressurization rate on the flash evaporation of a water film. Experimental study is carried out with initial water height ranging from 25 to 250 mm, superheats between 2 and 44 K, and an initial Liquid Temperature from 45 to 85 °C. Visualization of the phenomenon using a CCD camera lets us firstly point out the influence of the initial water level on the flashing phenomenon in a qualitative way. Thermal balance allows us to correlate the mass evaporated with the Liquid Temperature, and then to quantify the influence of the initial water height on several parameters: maximal amplitude of the phenomenon, flashing time, Liquid mass evaporated. We also analyse influence of relatively low depressurization rate (from 0 to 3.5 bar⋅s−1) on the flashing time, the mass evaporated, and the mass flow rate. Finally, dimensionless correlations between these parameters are proposed.

Didier Saury - One of the best experts on this subject based on the ideXlab platform.

  • flash evaporation from a water pool influence of the Liquid height and of the depressurization rate
    International Journal of Thermal Sciences, 2005
    Co-Authors: Didier Saury, Souad Harmand, Monica Siroux
    Abstract:

    Abstract This article presents a study about the influence of the initial water height and of the depressurization rate on the flash evaporation of a water film. Experimental study is carried out with initial water height ranging from 25 to 250 mm, superheats between 2 and 44 K, and an initial Liquid Temperature from 45 to 85 °C. Visualization of the phenomenon using a CCD camera lets us firstly point out the influence of the initial water level on the flashing phenomenon in a qualitative way. Thermal balance allows us to correlate the mass evaporated with the Liquid Temperature, and then to quantify the influence of the initial water height on several parameters: maximal amplitude of the phenomenon, flashing time, Liquid mass evaporated. We also analyse influence of relatively low depressurization rate (from 0 to 3.5 bar⋅s−1) on the flashing time, the mass evaporated, and the mass flow rate. Finally, dimensionless correlations between these parameters are proposed.

  • flash evaporation from a water pool influence of the Liquid height and of the depressurization rate
    International Journal of Thermal Sciences, 2005
    Co-Authors: Didier Saury, Souad Harmand, Monica Siroux
    Abstract:

    Abstract This article presents a study about the influence of the initial water height and of the depressurization rate on the flash evaporation of a water film. Experimental study is carried out with initial water height ranging from 25 to 250 mm, superheats between 2 and 44 K, and an initial Liquid Temperature from 45 to 85 °C. Visualization of the phenomenon using a CCD camera lets us firstly point out the influence of the initial water level on the flashing phenomenon in a qualitative way. Thermal balance allows us to correlate the mass evaporated with the Liquid Temperature, and then to quantify the influence of the initial water height on several parameters: maximal amplitude of the phenomenon, flashing time, Liquid mass evaporated. We also analyse influence of relatively low depressurization rate (from 0 to 3.5 bar⋅s−1) on the flashing time, the mass evaporated, and the mass flow rate. Finally, dimensionless correlations between these parameters are proposed.