Suitable Modeling for Process Flow Sheet Optimization Using the Correct Economic Criterion

2011 ◽  
Vol 50 (6) ◽  
pp. 3356-3370 ◽  
Author(s):  
M. Kasaš ◽  
Z. Kravanja ◽  
Z. Novak Pintarič
Keyword(s):  
Flow Sheet ◽  
Process Flow ◽  
Economic Criterion ◽  
Process Flow Sheet

scholarly journals Process Model for the Production of Syngas via High Temperature Co-Electrolysis

2007 ◽  
Author(s):  
M. G. McKellar ◽  
J. E. O’Brien ◽  
C. M. Stoots ◽  
G. L. Hawkes
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Process Model ◽  
Nuclear Reactor ◽  
Flow Sheet ◽  
Process Flow ◽  
One Dimensional ◽  
Electrolysis Process ◽  
Process Flow Sheet ◽  
The One

A process model has been developed to evaluate the potential performance of a large-scale high-temperature co-electrolysis plant for the production of syngas from steam and carbon dioxide. The co-electrolysis process allows for direct electrochemical reduction of the steam-carbon dioxide gas mixture, yielding hydrogen and carbon monoxide, or syngas. The process model has been developed using the Honeywell UniSim systems analysis code. Using this code, a detailed process flow sheet has been defined that includes all the components that would be present in an actual plant such as pumps, compressors, heat exchangers, turbines, and the electrolyzer. Since the electrolyzer is not a standard UniSim component, a custom one-dimensional co-electrolysis model was developed for incorporation into the overall UniSim process flow sheet. The one dimensional co-electrolysis model assumes local chemical equilibrium among the four process-gas species via the gas shift reaction. The electrolyzer model allows for the determination of co-electrolysis outlet temperature, composition (anode and cathode sides); mean Nernst potential, operating voltage and electrolyzer power based on specified inlet gas flow rates, heat loss or gain, current density, and cell area-specific resistance. The one-dimensional electrolyzer model was validated by comparison with results obtained from a fully three dimensional computational fluid dynamics model developed using FLUENT, and by comparison to experimental data. This paper provides representative results obtained from the UniSim flow sheet model for a 300 MW co-electrolysis plant, coupled to a high-temperature gas-cooled nuclear reactor. The co-electrolysis process, coupled to a nuclear reactor, provides a means of recycling carbon dioxide back into a useful liquid fuel. If the carbon dioxide source is based on biomass, the entire process would be climate neutral.

scholarly journals Simulation and Optimization of an Integrated Process Flow Sheet for Cement Production

2021 ◽  
Author(s):  
Oluwafemi M. Fadayini ◽  
Adekunle A. Obisanya ◽  
Gloria O. Ajiboye ◽  
Clement Madu ◽  
Tajudeen O. Ipaye ◽  
...  
Keyword(s):  
Flow Rate ◽  
High Energy ◽  
Flow Diagram ◽  
Contour Plot ◽  
Flow Sheet ◽  
Process Flow ◽  
Cement Production ◽  
Aspen Hysys ◽  
Surface Plot ◽  
Process Flow Sheet

In this study the process flow diagram for the cement production was simulated using Aspen HYSYS 8.8 software to achieve high energy optimization and optimum cement flow rate by varying the flow rate of calcium oxide and silica in the clinker feed. Central composite Design (C.C.D) of Response Surface Methodology was used to design the ten experiments for the simulation using Design Expert 10.0.3. Energy efficiency optimization is also carried out using Aspen Energy Analyser. The optimum cement flow rate is found from the contour plot and 3D surface plot to be 47.239 tonnes/day at CaO flow rate of 152.346 tonnes/day and the SiO2 flow rate of 56.8241 tonnes/day. The R2 value of 0.9356 determined from the statistical analysis shows a good significance of the model. The overall utilities in terms of energy are found to be optimised by 81.4% from 6.511 x 107 kcal/h actual value of 1.211 x 107 kcal/h with 297.4 tonnes/day the carbon emission savings.

Process flow-sheet for gold and antimony recovery from stibnite

2000 ◽  
Vol 57 (3) ◽  
pp. 187-199 ◽  
Author(s):  
S Ubaldini ◽  
F Vegliò ◽  
P Fornari ◽  
C Abbruzzese
Keyword(s):  
Flow Sheet ◽  
Process Flow ◽  
Process Flow Sheet

scholarly journals Recovery of Uranium from Alkaline Ore Leach Solution Using a Precipitating Method

2020 ◽  
pp. 1-8
Author(s):  
Sujoy Biswas ◽  
V. H. Rupawate ◽  
M.L. Sahu
Keyword(s):  
Chemical Composition ◽  
Process Parameters ◽  
Reaction Temperature ◽  
Leach Solution ◽  
Precipitation Method ◽  
Flow Sheet ◽  
Process Flow ◽  
Low Concentration ◽  
Yellow Color ◽  
Process Flow Sheet

In this paper, recovery of uranium from carbonate ore leach solution has been reported using a novel precipitation method. The method is based on the precipitation of uranium as yellow color magnesium diuranate (MDU) using MgO/NaOH mixture. The process has been finalized by optimizing various process parameters such as concentration of CO32-, HCO3-, HCl, NaOH, MgO and reaction temperature. The overall recovery of uranium was 97%. The chemical composition of the yellow precipitate (MDU) was evaluated employing XRD technique. A process flow-sheet has been developed for recovery of U(VI) from low concentration carbonate ore leach solution.

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