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RISS 인기검색어
- 검색키워드
- 저자 : Akbar Shahsavand (검색결과 3 건)
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Reliable estimation of adsorption isotherm parameters using adequate pore size distribution
Danial Husseinzadeh,Akbar Shahsavand 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5
The equilibrium adsorption isotherm has a crucial effect on various characteristics of the solid adsorbent (e.g., pore volume, bulk density, surface area, pore geometry). A historical paradox exists in conventional estimation of adsorption isotherm parameters. Traditionally, the total amount of adsorb material (total adsorption isotherm) has been considered equivalent to the local adsorption isotherm. This assumption is only valid when the corresponding pore size or energy distribution (PSD or ED) of the porous adsorbent can be successfully represented with the Dirac delta function. In practice, the actual PSD (or ED) is far from such assumption, and the traditional method for prediction of local adsorption isotherm parameters leads to serious errors. Up to now, the powerful combination of inverse theory and linear regularization technique has drastically failed when used for extraction of PSD from real adsorption data. For this reason, all previous researches used synthetic data because they were not able to extract proper PSD from the measured total adsorption isotherm with unrealistic parameters of local adsorption isotherm. We propose a novel approach that can successfully provide the correct values of local adsorption isotherm parameters without any a priori and unrealistic assumptions. Two distinct methods are suggested and several illustrative (synthetic and real experimental) examples are presented to clearly demonstrate the effectiveness of the newly proposed methods on computing the correct values of local adsorption isotherm parameters. The so-called Iterative and Optima methods’ impressive performances on extraction of correct PSD are validated using several experimental data sets.
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Reliable modeling of discharge process for adsorbed natural gas storage tanks
Mahdi Khorashadizadeh,Akbar Shahsavand,Mahdi Niknam Shahrak 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
Natural gas consumption has doubled in the last fifteen years. Among all storage techniques, adsorbednatural gas (ANG) provides a reliable vehicle for safe utilization of natural gas. Despite all favorable characteristicsof the ANG process, thermal adverse effects during charge and discharge processes are the most challenging issuesfacing adsorbed natural gas applications, especially for automotive usage. Mathematical modeling of an ANG tankcan provide a reliable method to analyze and solve such problems. A robust and lumped model is presented to mimicthe discharge process of an ANG tank storing pure component. The proposed model is very convenient compared toother available conventional models that require extensive computational efforts. Two experimental measurements andtwo simulation data sets (borrowed from literature) are recruited to validate the model predictions. The simulation resultsindicate proper agreement between the proposed model predictions and the validation data.
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Seyed Heydar Rajaee Shooshtari,Akbar Shahsavand 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10
Proper correction of water and heavy hydrocarbon dew points of sweet natural gases is essential from vari-ous technical and economical standpoints. Supersonic separators (3S) are proved to be capable of achieving these taskswith maximum reliability and minimal expenses. The majority of the previous articles have focused on the flow behaviorof pure fluids across a 3S unit. Multicomponent fluid flow inside 3S accompanied with condensation phenomenonwill drastically increase the complexity of the simulation process. We tackle this issue by considering a proper com-bination of fundamental governing equations and phase equilibrium calculations to predict various operating conditionsand composition profiles across two multi-component and multi-phase 3S units. Various Iranian sweet gases are usedas real case studies to demonstrate the importance of 3S unit practical applications. Simulation results clearly illustratethe effectiveness of 3S units for faithful dehydration of various natural gases, while successfully controlling its dewpoint, suitable for any practical applications. Conventional HYSYS simulation software is used to validate the simulationresults.
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