A systematic approach to the modeling and simulation of a Sorption Enhanced Water Gas Shift (SEWGS) process for CO2 capture

Najmi, Bita; Bolland, Olav; Colombo, Konrad Eichhorn

doi:10.1016/j.seppur.2015.11.013

Cited by 31 publications

(16 citation statements)

References 30 publications

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“…Concerning SEWGS optimization, the necessity of generating new process knowledge has driven different authors to focus mostly on using physical models to execute parametric sensitivities with pre-specified cycle designs [12,24,[35][36][37]. First, Reijers et al (2011) conducted a parametric sensitivity on cycle time, feed flow rate, and purge and rinse steam flows, with a fixed six-column cycle design, including one feed co-current pressure equalization, feed countercurrent rinse, feed countercurrent blow down, feed-countercurrent repressurization with partial recycle of the light H 2 product, and an idle step [37].…”

Section: Optimization Of Sewgs Based Processes Via Computer Simulationsmentioning

confidence: 99%

“…High-pressure (HP) steam is supplied as a reactant to the pre-WGS. Additional HP steam is added to the STEPWISE unit to increase the sharpenss of the CO 2 separation by rinsing the sorbent with a steam front [12,[34][35][36]. Low-pressure (LP) steam is used as purging agent to regenerate the sorbent and recover the CO 2 product at low pressures [12].…”

Section: Introductionmentioning

confidence: 99%

“…Low-pressure (LP) steam is used as purging agent to regenerate the sorbent and recover the CO 2 product at low pressures [12]. Both the rinse and purge steam amounts are usually expressed in relation to the amount of carbon fed (i.e., CO and CO 2 ) through steam-to-carbon ratios (S/C) [12,24,[35][36][37].…”

Section: Introductionmentioning

confidence: 99%

“…This is essentially a pre-programmed sequence of steps, which allows to operate semi-batch PSA-like processes on a continuous mode [5,9,10,39]. Cycle steps, such pressure equalizations (PEQs), rinse, and blow down (BD), which are valid for the STEPWISE technologies, are described extensively by previous authors [12,[35][36][37]. The parallel optimization of the Skarstrom cycle, or cycle design, and the process parameters is central to achieve high separation performances at low processing costs for STEPWISE, as for any other PSA-like technology [5,8,9,39].…”

Section: Introductionmentioning

confidence: 99%

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Steam and Pressure Management for the Conversion of Steelworks Arising Gases to H2 with CO2 Capture by Stepwise Technology

et al. 2022

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Steel production is a main source of CO2 emissions globally. These emissions must be drastically reduced to meet climate change mitigation goals. STEPWISE is a Sorption Enhanced Reactive Process (SERP) technology that converts steel works arising gases to H2 with simultaneous CO2 capture. The main energy requirements of the process are the high- and low-pressure steam quantities that are needed to rinse and regenerate the adsorbent. In this simulation study, the separation performance of STEPWISE is evaluated over a range of steam and feed pressure inputs by searching those design points where CO2 recovery and purity percentages are equalized. This method is used to facilitate the comparison of different operating regimes. Results highlight the importance of the rinse to purge ratio (R/P) as a design variable. A higher R/P ratio is demonstrated to maintain CO2 recovery and purity of ~95.5%, while total steam consumption and feed carbon loading are reduced by 27% and 20%, respectively. This is achieved without changing other parameters, like cycle time. Additionally, it is demonstrated that the CO2 capture performance can be maintained for varying feed pressure values by tuning the feed carbon loading. Future studies are recommended to focus on the expected role of the feed gas steam content on these findings.

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Section: Optimization Of Sewgs Based Processes Via Computer Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Steam and Pressure Management for the Conversion of Steelworks Arising Gases to H2 with CO2 Capture by Stepwise Technology

et al. 2022

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“…Consistently process modeling of packed‐bed reactive absorption columns associated with the development of new effective solvents is an important step for design, scale‐up, and optimization of industrial CO 2 capture process . It is well known that the CO 2 capture process in the packed‐bed absorbers is influenced by mass and heat transfer limitations .…”

Section: Introductionmentioning

confidence: 99%

Rate-Based Modeling of CO₂ Absorption into Piperazine-Activated Aqueous N -Methyldiethanolamine Solution: Kinetic and Mass Transfer Analysis

Saidi

2017

Int. J. Chem. Kinet.

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A comprehensive two‐dimensional mathematical model based on surface renewal theory has been developed to analyze the CO2 absorption into piperazine (PZ)‐activated aqueous N‐methyldiethanolamine (MDEA) solvent by taking into account the structured packed bed column hydraulics, mass transfer resistances, and chemical reactions. The modeling results have been validated with the experimental data reported in the literature, and they have been found to be in good agreement with the experimental results. The effects of amine concentration, liquid temperature, initial CO2 partial pressure, liquid flow rate, and CO2 loading on the mass transfer performance have been evaluated in terms of overall mass transfer coefficient (KGav). The overall mass transfer coefficient and absorption flux of CO2 into aqueous MDEA+PZ blended solution have been calculated over the CO2 partial pressure range of 4–16 kPa, temperature range of 298–333 K, and solvent concentration of 1–3 M. To evaluate the performance of different solvents on separation process, some common industrial chemical absorbents including monoethanolamine (MEA), diethanolamine (DEA), triethylamine (TEA), MDEA and PZ were compared with a MDEA+PZ blended solution. The results indicate that CO2 absorption reaction with PZ is faster than that with MDEA, but also adding small amounts of PZ as a promoter to MDEA solvents improves significantly the absorption rate. The results show that CO2 absorption reaction with the MDEA+PZ blended solution is faster than that with TEA and MDEA, also comparable with DEA, but slower than those with MEA and PZ. The modeling results illustrate that the KGav enhances with increasing the solvent concentration, liquid temperature, and liquid flow rate, but reduces with increasing the CO2 loading and initial CO2 partial pressure. In addition, the reaction kinetics in terms of enhancement factor was found to decrease as the CO2 loading enhances and increase as the operating temperature rises.

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Multiscale model based design of an energy‐intensified novel adsorptive reactor process for the water gas shift reaction

et al. 2019

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In this work, an adsorptive reactor (AR) process is considered that can energetically intensify the water gas shift reaction (WGSR). To best understand AR process behavior, a multiscale, dynamic, process model is developed. This multiscale model enables the quantification of catalyst and adsorbent effectiveness factors within the reactor environment, obliviating the commonly employed assumption that these factors are constant. Simulations of the AR's alternating adsorption‐reaction/desorption operation, using the proposed model, illustrate rapid convergence to a long‐term periodic solution. The obtained simulation results quantify the influence of key operating conditions and design parameters (e.g., reactor temperature/pressure, Wcat/FCO, Wad/FCO, FH2O/FCO ratios, and pellet size) on the AR's behavior. They also demonstrate, for pellet diameters used at the industrial scale, significant temporal and axial variation of the catalyst/adsorbent pellet effectiveness factors. Finally, the energetic intensification benefits of the proposed AR process over conventional WGSR packed‐bed reactors are quantified.

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A systematic approach to the modeling and simulation of a Sorption Enhanced Water Gas Shift (SEWGS) process for CO2 capture

Cited by 31 publications

References 30 publications

Steam and Pressure Management for the Conversion of Steelworks Arising Gases to H2 with CO2 Capture by Stepwise Technology

Steam and Pressure Management for the Conversion of Steelworks Arising Gases to H2 with CO2 Capture by Stepwise Technology

Rate-Based Modeling of CO₂ Absorption into Piperazine-Activated Aqueous N -Methyldiethanolamine Solution: Kinetic and Mass Transfer Analysis

Multiscale model based design of an energy‐intensified novel adsorptive reactor process for the water gas shift reaction

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A systematic approach to the modeling and simulation of a Sorption Enhanced Water Gas Shift (SEWGS) process for CO2 capture

Cited by 31 publications

References 30 publications

Steam and Pressure Management for the Conversion of Steelworks Arising Gases to H2 with CO2 Capture by Stepwise Technology

Steam and Pressure Management for the Conversion of Steelworks Arising Gases to H2 with CO2 Capture by Stepwise Technology

Rate-Based Modeling of CO2 Absorption into Piperazine-Activated Aqueous N -Methyldiethanolamine Solution: Kinetic and Mass Transfer Analysis

Multiscale model based design of an energy‐intensified novel adsorptive reactor process for the water gas shift reaction

Contact Info

Product

Resources

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Rate-Based Modeling of CO₂ Absorption into Piperazine-Activated Aqueous N -Methyldiethanolamine Solution: Kinetic and Mass Transfer Analysis