A New Model for the Simulation of CO2 Absorption in an Industrial-Scale Packed Column

2012 ◽  
Vol 557-559 ◽  
pp. 2208-2216 ◽  
Author(s):  
Wen Bin Li ◽  
Guo Cong Yu ◽  
Bo Tan Liu ◽  
Xi Gang Yuan
Keyword(s):  
Mass Transfer ◽  
Packed Column ◽  
Mass Conservation ◽  
Conservation Equation ◽  
Industrial Scale ◽  
Transfer Model ◽  
Turbulent Heat ◽  
Proposed Model ◽  
Heat Conservation ◽  
Phase Temperature

A new computational mass transfer model is proposed for simulating the chemical absorption process with heat effect by solving the average fluctuating mass flux in turbulent mass conservation equation and the average fluctuating heat flux in turbulent heat conservation equation, so that the concentration profile and the temperature profile of column can be obtained. The feather of the proposed model is to abandon the conventional way of introducing the unknown turbulent mass transfer diffusivity Dtand the turbulent thermal diffusivity αtin the mass and heat conservation equations. By using the proposed model, the simulated results of CO2absorption by aqueous monoethanolamine (MEA) solution in an industrial scale column is presented, including MEA concentration, CO2loading and liquid phase temperature. The simulations are in agreement with the published experiment data.

scholarly journals Modeling of Coal Drying before Pyrolysis

2013 ◽  
Vol 336 ◽  
pp. 121-128 ◽  
Author(s):  
Damintode Kolani ◽  
Eric Blond ◽  
Alain Gasser ◽  
Tatiana Rozhkova ◽  
Matthieu Landreau
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Coke Oven ◽  
Transfer Model ◽  
Mass Transfer Model ◽  
Drying Process ◽  
Finite Element Software ◽  
Proposed Model ◽  
Coal Drying ◽  
Temperature Plateau

The coking process is composed of two main stages: drying process and pyrolysis of coal. A heat and mass transfer model was developed to simulate the drying process of coal. The mechanisms of heat and mass transfer described in the model are: conduction through the coal cake; conduction and convection through the gas in pores; generation, flux and condensation of water vapor. The model has been implemented in finite element software. It requires basic data on the coke oven charge properties and oven dimensions as input. These input data were obtained by experiments or from the literature. The proposed model includes condensation and evaporation allowing us to reproduce the temperature plateau observed experimentally.

scholarly journals Experimental and Numerical Study on the Dehumidification Performance of KCOOH Solution

Proceedings ◽  
2018 ◽  
Vol 2 (22) ◽  
pp. 1375
Author(s):  
Yimo Luo ◽  
Yunlong Zhao ◽  
Ketong Yu ◽  
Tao Wen ◽  
Liyuan Sheng
Keyword(s):  
Mass Transfer ◽  
Numerical Study ◽  
Solution Temperature ◽  
Transfer Model ◽  
Internal Cooling ◽  
Mass Transfer Model ◽  
Air Humidity ◽  
Moisture Change ◽  
Proposed Model ◽  
Close Relationship

The present study intended to study the dehumidification performance of KCOOH solution both experimentally and numerically. The heat and mass transfer model for internal cooling dehumidifier was built. The influences of different parameters on dehumidification performance were identified by experiments. Results indicated that the air temperature and solution has negligible influence on dehumidification performance. However, the air humidity and solution temperature have significant influence on dehumidification due to its close relationship with mass transfer driving force. The proposed model can simulate the dehumidification performance in terms of absolute moisture change well with the MARD of 6.05%.

scholarly journals Pemodelan perpindahan massa ekstraksi kolom isian dengan distribusi ukuran tetesan

2018 ◽  
Vol 10 (2) ◽  
pp. 81
Author(s):  
Iwan Ridwan
Keyword(s):  
Mass Transfer ◽  
Droplet Size ◽  
Packed Column ◽  
Distribution Model ◽  
Transfer Model ◽  
Glass Ball ◽  
Dispersion Phase ◽  
Raschig Ring ◽  
Droplet Distribution ◽  
Ball Packing

Mass transfer modeling of extraction in a packed bed with droplet size distribution The evaluation of liquid extraction packed column is not able yet to give a satisfying result caused by constant spherical droplet size assumption. Droplet size from dispersion phase that is not homogeneous causes column calculation approach with assumption form of droplet haves the character of constant cannot be applied again. The goal of this research is to build droplet distribution model and mass transfer model at various heights of extraction column both in continuous phase and in dispersion phase. Droplet distribution model is more accurately applied to describe droplet breaks distribution for extraction in glass ball packed column with average of errors 4.53% compared to raschig ring packed column with average error of 11.52 %. At glass ball packing, the mass transfer modeling with total droplet has errors average to 57.67% while at raschig ring packing the model has errors average to 121.38%. Glass ball packing column model has smaller mean errors compared to raschig ring packing column because the glass ball packing form is more regular than the raschig ring packing. The amount of error between the mass transfer models and the experiment is caused by difference of the initial number of droplets that exit from the nozzle in the half circle column and in the full circle column. Keyword: extraction, packed column, droplet distribution model, mass transfer model AbstrakUkuran tetesan dari fasa dispersi yang tidak homogen menyebabkan pendekatan perhitungan kolom dengan asumsi bentuk tetesan bersifat konstan tidak dapat digunakan lagi. Tujuan dari penelitian ini adalah untuk membangun model distribusi tetesan dan model perpindahan massa pada berbagai ketinggian kolom ekstraksi baik di fasa kontinu maupun di fasa dispersi. Model distribusi tetesan lebih tepat digunakan untuk memodelkan fraksi tetesan pecah hasil penelitian pada ekstraksi kolom isian bola kaca dengan rata-rata error sebesar 4,53% dibandingkan dengan kolom isian raschig ring yang mempunyai error sebesar 11,52 Pada isian bola kaca pemodelan perpindahan massa dengan tetesan total mempunyai error rata-rata sebesar 57,67% sedangkan pada isian raschig ring mempunyai error rata-rata sebesar 121,38%. Model kolom isian bola kaca mempunyai error rata-rata yang lebih kecil dibandingkan dengan kolom kolom isian raschig ring, dikarenakan model isian bola kaca bentuknya lebih beraturan dibanding dengan kolom isian raschig ring yang bentuknya lebih tidak beraturan. Besarnya error perpindahan massa antara model dengan percobaan disebabkan oleh tidak samanya jumlah tetesan awal pada kolom setengah lingkaran dengan jumlah tetesan awal pada kolom lingkaran penuh.Kata kunci : ekstraksi,kolom isian, model distribusi tetesan, model perpindahan massa

scholarly journals Computer Simulation with a Temperature-Step Frying Approach to Mitigate Acrylamide Formation in French Fries

Foods ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 200 ◽  
Author(s):  
Der-Sheng Chan
Keyword(s):  
Mass Transfer ◽  
Water Content ◽  
Heat And Mass Transfer ◽  
French Fries ◽  
Transfer Model ◽  
Temperature Step ◽  
Acrylamide Formation ◽  
Potato Strip ◽  
Proposed Model ◽  
Save Energy

A heat and mass-transfer model coupled with reaction kinetics was developed to simulate frying. Obtaining an accurate mathematical model of the Maillard reaction and the heat and mass transfer is crucial for predicting the transient acrylamide formation, temperature, and water content in French fries. The objective of this study was to mitigate the formation of acrylamide in a potato strip by adopting a temperature step frying approach (TSFA). A considerable increase in the water content and a decrease in the temperature and acrylamide formation were observed in a potato strip fried with the TSFA compared with a potato strip fried without the TSFA process. The acrylamide content in a potato strip when fried using the TSFA decreased considerably to 57% of that in a potato strip fried without using the TSFA. Simulation of the acrylamide distribution in a potato strip revealed that the crust contains the highest amount of acrylamide. The proposed model can be successfully used to obtain high-quality products, mitigate acrylamide formation, and save energy.

Analytical modeling of combustion of a single iron particle burning in the gaseous oxidizing medium

2012 ◽  
Vol 227 (5) ◽  
pp. 1006-1021 ◽  
Author(s):  
Mehdi Bidabadi ◽  
Majid Mafi
Keyword(s):  
Thermal Radiation ◽  
Separation Of Variables ◽  
Mass Conservation ◽  
Iron Particle ◽  
Conservation Equation ◽  
Particle Combustion ◽  
Energy Conservation Equation ◽  
Proposed Model ◽  
Combustion Processes ◽  
Mass Conservation Equation

In the present study, a theoretical investigation is accomplished to model the combustion of a single iron particle by virtue of a novel thermophysical approach. It is assumed that a spherical iron particle falls freely in the gaseous medium and preheats and then burns heterogeneously on its external surface in this hot oxidizing environment and oxygen diffuses inward to the particle. A new physical parameter for thermal radiation is introduced. By solving the energy conservation equation for the iron particle, the temperature distribution of the iron particle during the preheating and combustion processes is calculated analytically. Also, by solving the oxygen mass conservation equation, the variation of oxygen concentration within the iron particle during the combustion stage is estimated. In the proposed model, the effect of thermal radiation and dynamic behavior of burning iron particle are considered. Because of high thermal conductivity and micro size of iron particle, the Biot number is negligibly small. The non-homogeneous partial differential equations of energy and mass species resulted from the modeling of combustion are solved by utilizing the method of separation of variables. The assumptions applied in the modeling are such that do not violate the actual combustion phenomenon. Also, the numerical solution of energy equation in the combustion stage is presented and compared with the obtained analytical solution. Also, the burnout time of iron particle is evaluated in this article. This investigation is one of the first performed efforts for analyzing and modeling of single iron particle combustion.

scholarly journals Modelling of High Pressure, High Concentration Carbon Dioxide Capture in Absorption Column

2015 ◽  
Vol 773-774 ◽  
pp. 1138-1142
Author(s):  
Tan Lian See ◽  
Tay Wee Horng ◽  
Kok Keong Lau ◽  
Mohd Shariff Azmi
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
High Pressure ◽  
Natural Gas ◽  
Packed Column ◽  
Conservation Equation ◽  
Low Carbon ◽  
High Concentration ◽  
Absorption Column ◽  
Gas Removal

With the depletion of low carbon dioxide (CO2) content natural gas reserves, there is a pressing need to explore the vastly undeveloped high CO2 content natural gas reserves and reduce the release of greenhouse gas CO2 into environment. Our previous investigation on the absorption performance of CO2 at high concentration level of 50% from mixture of CO2-natural gas stream for 20wt% monoethanolamine (MEA) solution in countercurrent packed column indicated efficient removal at high pressure condition. In this present work, a combination mass transfer, chemical reaction of MEA as well as mass conservation equation was developed to model the removal behavior of the high pressure, high concentration CO2 capture along the absorption column. The model developed in this study had satisfactorily represented the mass transfer behavior for high pressure and high CO2 concentration gas removal along the absorption column.

Sign in / Sign up

Export Citation Format

Share Document