scholarly journals CFD Simulation of CO2 and Methane Adsorption at Various Temperature for MOF-5 using Dual-site and Single-site Langmuir Model

CFD Letters ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1-10
Author(s):  
Mohd Zul Amzar Zulkifli ◽  
Azfarizal Mukhtar ◽  
Muhammad Faizulizwan Mohamad Fadli ◽  
Anis Muneerah Shaiful Bahari ◽  
Akihiko Matsumoto ◽  
...  
Keyword(s):  
Energy Demand ◽  
Carbon Capture ◽  
Cfd Simulation ◽  
Co2 Adsorption ◽  
Minimum Energy ◽  
Packed Bed ◽  
Methane Adsorption ◽  
Adsorption Model ◽  
Porous Media Model ◽  
Dual Site

The annual increase in energy demand has led to an increase in greenhouse gas emissions, in particular CO2 emissions from the power generation industry. Carbon Capture and Utilization are technologies applied to capture CO2 gases and transform the gases into a different energy source. The adsorption technology to capture CO2 gases was chosen due to the minimum energy consumption and low costs required for an industrial application for sustainability. Metal-Organic Framework (MOF) has a reasonably high CO2 adsorption capability. It has been applied as an adsorbent for capturing and storing CO2. In this study, a comparison of CFD simulation with experimental CO2 and methane adsorption values in solid adsorbent beds containing MOF-5 at various temperatures was presented. The simulation was performed using 2D and 3D models from 0℃ at STP to 130℃ for CO2 and methane gas molecules. In addition, the isothermal and kinetic adsorption model was added to the simulations. This includes Single- and Dual-Site Langmuir adsorption isotherm and Linear Driving Force. The porous media model was then activated to imitate packed bed adsorbent and measured the pressure drop from the simulation. The results showed that the CO2 adsorption values of MOF-5 decrease as the adsorbent temperature increases. There was a decline of 0.002 mmol/g of adsorbed CO2 molecules per 10-kelvin difference. The CO2 adsorption value was 0.53 mmol/g at STP and 1.15 mmol/g for CH4 at STP. Both CO2 and CH4 adsorption were used to suggest optimal CO2 adsorption for the Pressure Swing Adsorption cycle.

scholarly journals CFD simulation of reactive flow in parallel flow regenerative shaft kilns using porous media model

2021 ◽  
pp. 281-281
Author(s):  
Kamyar Mohammadpour ◽  
Ali Alkhalaf ◽  
Ali Chitsazan ◽  
Eckehard Specht
Keyword(s):  
Porous Media ◽  
Cross Section ◽  
Cfd Simulation ◽  
Packed Bed ◽  
Flame Length ◽  
Parallel Flow ◽  
Reactive Flow ◽  
Porous Media Model ◽  
Temperature Homogenization ◽  
The Cross

Understanding the flow pattern of the gas jets in packed beds can have considerable significance in improving reactor design and process optimization. This study researches the fuel diffusion in the radial direction and the flame length in a packed bed of a Parallel Flow Regenerative (PFR) Shaft kiln. This kiln is characterized that the fuel is injected vertically in the packed bed using a lot of lances in the cross-section while the combustion air is distributed continuously. Such a large, packed bed has to be approximated as a porous media. This assumption is used to model the reactive flow in the kilns. Using a box with 700 spheres of 52 mm spheres in Body-Centered Cube (B.C.C.) arrangement the local concentrations of injected nitrogen in airflow were measured. The measured values match approximately with those calculated with the Porous Media Model (PMM). The studied parameters are the number of burners and burner arrangements. The radial mixing of fuel and air in a packed bed is relatively bad. Therefore, a lot of burners are needed for better temperature homogenization in the cross-section.

scholarly journals Effect of Ion Exchanged to the CO2 Adsorption on MFI Zeolites

2014 ◽  
Vol 13 (2) ◽  
pp. 73
Author(s):  
Sang Kompiang Wirawan ◽  
I Wayan Warmada ◽  
Endang Tri Wahyuni
Keyword(s):  
Atmospheric Pressure ◽  
Co2 Adsorption ◽  
Adsorption Model ◽  
Langmuir Adsorption ◽  
Langmuir Adsorption Model ◽  
Weak Adsorption ◽  
Temperature Programmed ◽  
Adsorption Of Co2 ◽  
Mfi Zeolites ◽  
Dual Site

The adsorption of CO2 on MFI (HZSM-5) and ion exchanged MFI (CaZSM-5) zeolites were studied by a temperature programmed desorption (TPD). The adsorption measurements were conducted at temperatures from 323 to 473 K at atmospheric pressure. The results showed that CO2 was adsorbed on HZSM-5 by one type of adsorption, and on CaZSM-5 zeolites by at least two types of adsorption over the temperature range studied. One was a weak adsorption probably due to interaction with the framework of ZSM-5, and the other was a stronger adsorption caused by interactions with the Ca cations of ZSM-5. The adsorption behavior for HZSM-5 was described by a single site Langmuir adsorption model but for CaZSM-5 a dual site Langmuir model was used. The TPD results indicated that the quantity of irreversibly adsorbed CO2 on HZSM-5 was undetectable.

scholarly journals CFD Simulation of Dry Pressure Drop in a Cross-Flow Rotating Packed Bed

2021 ◽  
Vol 11 (21) ◽  
pp. 10099
Author(s):  
Chao Zhang ◽  
Weizhou Jiao ◽  
Youzhi Liu ◽  
Guisheng Qi ◽  
Zhiguo Yuan ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Cfd Simulation ◽  
Complex Structure ◽  
Scale Up ◽  
Cross Flow ◽  
Packed Bed ◽  
Rotating Packed Bed ◽  
Porous Media Model ◽  
The Cross

The cross-flow rotating packed bed (RPB) has attracted wide attention in recent years because of its advantages of large gas capacity, low pressure drop and lack of flooding limitation. However, the complex structure of the packing makes it difficult to obtain the gas flow characteristics in the cross-flow RPB by experiments. In this study, the dry pressure drop in the cross-flow RPB was investigated by computational fluid dynamics (CFD). The packing was modeled by the porous media model and the rotation of the packing was simulated by the sliding mesh model. The simulation results obtained by three turbulence models were compared with experimental results, and the RNG k-ε model was found to best describe the turbulence behaviors in the cross-flow RPB. Then, the effects of gas flow rate and rotating speed on dry pressure drop in different parts of the cross-flow RPB were analyzed. The results of this study can provide important insights into the design and scale-up of cross-flow RPB.

scholarly journals Coordination of Multiple Electric Vehicle Aggregators for Peak Shaving and Valley Filling in Distribution Feeders

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 352
Author(s):  
Saad Ullah Khan ◽  
Khawaja Khalid Mehmood ◽  
Zunaib Maqsood Haider ◽  
Muhammad Kashif Rafique ◽  
Muhammad Omer Khan ◽  
...  
Keyword(s):  
Electric Vehicle ◽  
Power Distribution ◽  
Distribution System ◽  
Energy Demand ◽  
Minimum Energy ◽  
Peak Shaving ◽  
Peak Period ◽  
Actual Distribution ◽  
Load Profile ◽  
System Load

In this paper, a coordination method of multiple electric vehicle (EV) aggregators has been devised to flatten the system load profile. The proposed scheme tends to reduce the peak demand by discharging EVs and fills the valley gap through EV charging in the off-peak period. Upper level fair proportional power distribution to the EV aggregators is exercised by the system operator which provides coordination among the aggregators based on their aggregated energy demand or capacity. The lower level min max objective function is implemented at each aggregator to distribute power to the EVs. Each aggregator ensures that the EV customers’ driving requirements are not relinquished in spite of their employment to support the grid. The scheme has been tested on IEEE 13-node distribution system and an actual distribution system situated in Seoul, Republic of Korea whilst utilizing actual EV mobility data. The results show that the system load profile is smoothed by the coordination of aggregators under peak shaving and valley filling goals. Also, the EVs are fully charged before departure while maintaining a minimum energy for emergency travel.

Three-dimensional CFD simulation of anaerobic reactions in a continuous packed-bed bioreactor

2021 ◽  
Author(s):  
Sasan Zarei ◽  
Seyyed Mohammad Mousavi ◽  
Teimour Amani ◽  
Mehrdad Khamforoush ◽  
Arezou Jafari
Keyword(s):  
Cfd Simulation ◽  
Three Dimensional ◽  
Packed Bed ◽  
Packed Bed Bioreactor

Adsorption of Carbon Dioxide on Monoethanolamine (MEA)–Impregnated Kenaf Core Fiber by Pressure Swing Adsorption System (PSA)

2014 ◽  
Vol 68 (5) ◽  
Author(s):  
Nabilah Zaini ◽  
Khairul Sozana Nor Kamarudin
Keyword(s):  
Carbon Dioxide ◽  
Carbon Capture ◽  
Pressure Swing Adsorption ◽  
Co2 Adsorption ◽  
Carbon Capture And Storage ◽  
Freundlich Isotherm ◽  
Industrial Applications ◽  
Sem Analysis ◽  
Impregnation Method ◽  
Pressure Swing

Emission of carbon dioxide (CO2) becomes a major concern in combating issues of global warming. The strategy to reduce the concentration of CO2 could be achieved by executing carbon capture and storage (CCS) technology such as adsorption. This study presents the used of kenaf as a green source for CO2 adsorption material. The modification of MEA on kenaf is a novelty work to enhance the capacity of adsorbent since MEA has been proved to have potential in separating CO2 in industrial applications. In this work, 10 wt % of MEA has been impregnated on kenaf via wet impregnation method. The adsorption of CO2 study was conducted by passing CO2/N2 mixture in a ratio of 30:70 in a Pressure Swing Adsorption (PSA) system with a pressure up to 1.5 bar at ambient temperature. Result obtained via SEM analysis shows that the morphology of kenaf was affected after modification with MEA. However, the presence of MEA on kenaf has improved the CO2 adsorption capacity by 16 %. In addition, the adsorption equilibrium data for kenaf and MEA modified kenaf are well fitted in Freundlich isotherm model at low pressure and well fitted in Langmuir model at higher pressure. This study indicates that the introduction of MEA on kenaf could enhance the CO2 adsorption process.  

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