Modeling of Drying of Gaseous Mixtures in TSA System with Fixed Bed of Solid Desiccants

Nastaj, J.; Ambrożek, B.

doi:10.1080/07373937.2012.685138

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…In the process of TSA simulation, the flow sheet was built and is illustrated in Figure . To achieve complete bed bottom regeneration during the adsorption process, the hot gas flow is countercurrent to the adsorption flow . In the cooling process, a gas stream at 30 °C that comes into contact with the adsorbent directly cools down the temperature of the bed.…”

Section: Model Assumptionsmentioning

confidence: 99%

Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO₂/Al₂O₃ Ratios

Yue

Wang

et al. 2023

Ind. Eng. Chem. Res.

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A mechanistic study was presented on the effect of the SiO 2 /Al 2 O 3 ratio (SAR) on the adsorption/desorption behaviors of low-concentration volatile organic compounds (VOCs) over H-ZSM-5. In this study, n-hexane, toluene, and ethyl acetate were used as the probe VOC molecules. And their adsorption isotherms on different H-ZSM-5 (SARs = 25, 130, 300, and 470) were collected at various temperatures (30, 40, and 50 °C). Results showed that high SARs were conducive to adsorption, but the desorption efficiency was imperfect. The dependence between an absorbent and VOCs was divergent. Higher adsorption capacity for toluene (87.54 mg•g −1 ) and ethyl acetate (150.74 mg• g −1 ) was achieved on H-ZSM-5(470), while H-ZSM-5(300) owned higher adsorption capacity for n-hexane (107.24 mg•g −1 ). Based on the adsorption isotherms and breakthrough curves, the equilibrium and kinetic parameters were obtained based on the Langmuir model. Then, a rigorous temperature swing desorption (TSA) model was established to predict the evolution of temperature and VOC concentration along the axial adsorption bed. And the simulation results of the TSA process agreed well with the experimental data.

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Section: Model Assumptionsmentioning

confidence: 99%

Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO₂/Al₂O₃ Ratios

Yue

Wang

et al. 2023

Ind. Eng. Chem. Res.

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“…It may also be noted that they did not have any energy efficiency consideration. Moreover, the inlet air temperature and humidity had a considerable impact on the effective performance of the adsorption and desorption steps in the TSA process [15]. Therefore, it was theorized that this Conventional Steady Cyclic (CSC) operation was not flexible enough to handle the inevitable change in feed composition and temperature leading to periodically inefficient cycles.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on a Novel Temperature Breakpoint Cyclic Operation to Enhance Desiccant Packed Bed Performance

Murathathunyaluk¹,

Kitchaiya²

2021

IJHT

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In a conventional desiccant packed bed dehumidification, the adsorption and desorption operations switched at a constant cycle. However, this Conventional Steady Cyclic (CSC) operation was not performed well under disturbances. Therefore, a Temperature Breakpoint Cyclic (TBC) operation is proposed. A numerical model of the desiccant packed bed dehumidification system has been constructed and validated. The model was then used to assess the desiccant packed bed dehumidification performances in term of moisture removal capacity (MRC) and dehumidification coefficient of performance (DCOP) under various cycle times and temperature factors. The calculation results showed that under CSC, larger amounts of energy were required in the desorption operation, while the TBC exhibited higher performances in term of both MRC and DCOP. Notably, at a high regeneration temperature, the MRC of the TBC was 10% higher than the CSC’s; moreover, the DCOP of the TBC was twice higher than the CSC’s. In other words, at high recovery temperature, both operations exhibited comparable capacities while the energy cost was halved under TBC operation.

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“…They introduced two corrections to Wunder’s approach to account for mass transfer limitations and the deterioration of the adsorbent capacity with continuous operation. Following Manning and Thompson, several groups have reported the design and assessment of operating drying units. , High fidelity modeling studies of gas drying processes were conducted by several groups with the main objective of assessing mass transfer correlations or experimental data fitting. , To the best knowledge of the authors, high fidelity model-based optimal design of natural gas dryers with the objective of minimizing the net present value of all costs (NPVC) ensued during the life cycle of the unit has not been performed in the reported literature. Minimizing the NPVC requires addressing three main challenges.…”

Section: Introductionmentioning

confidence: 99%

“…11,12 High fidelity modeling studies of gas drying processes were conducted by several groups with the main objective of assessing mass transfer correlations or experimental data fitting. 13,14 To the best knowledge of the authors, high fidelity model-based optimal design of natural gas dryers with the objective of minimizing the net present value of all costs (NPVC) ensued during the life cycle of the unit has not been performed in the reported literature. Minimizing the NPVC requires addressing three main challenges.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Adsorption-Based Natural Gas Dryers

Wahedi¹,

Rabie²,

Shaiba

et al. 2016

Ind. Eng. Chem. Res.

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Common approaches in designing natural gas dryers are based on empirical algebraic correlations and design heuristics. Such approaches fail to capture the process physics and are generally not optimal. In this work a new method for the design of natural gas dryers is presented. The method formulates a mixed integer nonlinear programming (MINLP) problem where the objective is to minimize the net present value of ensued costs (NPVC) of the drying system throughout its lifetime, while meeting all process constraints. Two process schemes based on common industrial conditions are considered, which differ in the source of the regeneration gas. Both schemes are shown to attain an optimal NPVC in the range of 4.5 to 5.4 $/MMSCF. When compared to conventional methods, this represents a reduction in the range of 17- 37%. The cost savings are primarily achieved from the optimization of the adsorption time, regeneration time, and the regeneration gas flow rate, thus illustrating the advantages of the proposed optimal design.

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Modeling of Drying of Gaseous Mixtures in TSA System with Fixed Bed of Solid Desiccants

Cited by 11 publications

References 22 publications

Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO₂/Al₂O₃ Ratios

Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO₂/Al₂O₃ Ratios

Theoretical Study on a Novel Temperature Breakpoint Cyclic Operation to Enhance Desiccant Packed Bed Performance

Optimization of Adsorption-Based Natural Gas Dryers

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Modeling of Drying of Gaseous Mixtures in TSA System with Fixed Bed of Solid Desiccants

Cited by 11 publications

References 22 publications

Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO2/Al2O3 Ratios

Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO2/Al2O3 Ratios

Theoretical Study on a Novel Temperature Breakpoint Cyclic Operation to Enhance Desiccant Packed Bed Performance

Optimization of Adsorption-Based Natural Gas Dryers

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Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO₂/Al₂O₃ Ratios

Experimental and Numerical Investigations on the Adsorption/Desorption Performance of Low-Concentration VOCs over H-ZSM-5 with Different SiO₂/Al₂O₃ Ratios