1,721,177 research outputs found
Improved rate-based modeling of the process of CO2 capture with PZ solution
Full text linkIn recent years the interest in the development of CO2 capture technology has increased due to global warming, which is mainly due to emissions of carbon dioxide and which causes climate changes to the atmosphere and the Earth.
Commercial software packages are based on different methods for the column calculations, such as equilibrium or rate-based approaches. The commercial simulation software ASPEN Plus® has been used as a framework for the modeling, based on the rate-based approach with the Eddy diffusivity theory. The proposed model has been validated by comparison with experimental data.
An improvement in the prediction of mass transfer coefficients has been obtained by linking an external Fortran user subroutine to the software
Economic analysis of a combined production of hydrogen-energy from empty fruit bunches
No full textThis work relates to an economic analysis and a comparison between different process solutions for the production of hydrogen and the co-production of hydrogen and energy by means of a zero emission biomass integrated supercritical water gasification (SCWG) and combined cycle power plant. The case study will be located in Malaysia. Energy will be produced in agreement with the Small Renewable Energy Power Plant (SREP) Program, promoted by the Government of Malaysia. Hydrogen is obtained by supercritical water gasification (SCWG) of empty fruit bunches (EFB), a technology of interest for the processing of biomass with high moisture content. The economic analysis has been carried out to demonstrate the feasibility of the process solutions and to compare their convenience. The feedstock is 35 Mg h−1 of empty fruit bunches (EFB), a biomass obtained in the Palm Oil Industry. The location of the site is Teluk Intak District in the State of Perak (Malaysia). The study is performed with Aspen Plus® V7.2. The aim of this work is to investigate the economic convenience of supercritical water gasification technology applied to a potential industrial case study in order to state the possibilities and the trade-off for the production of hydrogen and the co-production of hydrogen and energy from biomass, using an innovative technology (SCWG) instead of a typical unit for syngas and energy production. The processes have been developed to reach zero emissions and zero wastes. CO2 and solid residuals are recycled inside palm oil lifecycle
Hydrocracking of Fischer-Tropsch waxes: thermodynamic and kinetic aspects
No full textA pathway-level kinetic model for the hydrocracking process of the Fischer-Tropsch waxes is presented. In particular, some thermodynamic and kinetic aspects are discussed. Form a thermodynamic point of view, critical properties of heavy paraffins have been computed in order to introduce the VLE calculation in the kinetic model. Moreover a new function for the equilibrium constants for isomerization reactions has been developed. For which concerns kinetics, a breakage probability function for the C-C bonds has been used instead of the assumption of the breakage in the middle of the chain. It is shown how, by correctly accounting for both thermodynamic and kinetic effects, reliable results can be obtained in modeling the hydrocracking of a complex feedstock (n-C5-C70 mixture)
Sustainable combined production of hydrogen and energy from biomass in malaysia
Full text linkThis work relates to a comparison between process solutions for the production of H2 and the coproduction
of H2 and energy by means of a zero emission biomass integrated gasification and a combined
cycle (BIGCC) power plant. The energy production is 10 MWe, in agreement with the Small Renewable
Energy Power Plant (SREP) Program, promoted by the Government of Malaysia. H2 is obtained by
supercritical water gasification (SCWG), a technology of interest for the processing of biomass with high
moisture content. An economic analysis has been carried out in order to demonstrate the feasibility of the
process solutions and to compare their convenience. The feedstock is 280,000 t/y of Empty Fruit Bunch
(EFB), a biomass obtained in the Palm Oil Industry. The location of the site is Teluk Intak District in the
State of Perak (Malaysia). The processes are designed with Aspen Plus® V7.2. The aim of this work is to
develop detailed process flow diagrams for the supercritical water gasification technology in order to study
and compare the convenience and the sustainability of different scenarios that can be adopted in an
industrial context. The processes have been developed to reach zero emissions and zero wastes. CO2 and
solid residuals are recycled inside the palm oil lifecycle. A cost analysis has been performed to find out the
convenience of the proposed solutions
Dynamic simulation with Hysys.Plant(R) for safety analysis. Part I: The cumene oxidation
No full textModeling the methyldiethanolamine-piperazine scrubbing system for CO2 removal: Thermodynamic analysis
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Criteri tecnici ed economici di dimensionamento dei fermentatori per biomasse proteiche da mosto d'uva
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