scholarly journals Thermodynamic Analyses of Fuel Production Via Solar-Driven Ceria-Based Nonstoichiometric Redox Cycling: A Case Study of the Isothermal Membrane Reactor System

2019 ◽  
Vol 141 (2) ◽  
Author(s):  
Sha Li ◽  
Peter B. Kreider ◽  
Vincent M. Wheeler ◽  
Wojciech Lipiński
Keyword(s):  
Heat Recovery ◽  
Membrane Reactor ◽  
Reactor System ◽  
Oxidation Reactions ◽  
Operational Parameters ◽  
Fuel Production ◽  
Counter Flow ◽  
Carbon Dioxide Splitting ◽  
Flow Configurations

A thermodynamic model of an isothermal ceria-based membrane reactor system is developed for fuel production via solar-driven simultaneous reduction and oxidation reactions. Inert sweep gas is applied on the reduction side of the membrane. The model is based on conservation of mass, species, and energy along with the Gibbs criterion. The maximum thermodynamic solar-to-fuel efficiencies are determined by simultaneous multivariable optimization of operational parameters. The effects of gas heat recovery and reactor flow configurations are investigated. The results show that maximum efficiencies of 1.3% (3.2%) and 0.73% (2.0%) are attainable for water splitting (carbon dioxide splitting) under counter- and parallel-flow configurations, respectively, at an operating temperature of 1900 K and 95% gas heat recovery effectiveness. In addition, insights on potential efficiency improvement for the membrane reactor system are further suggested. The efficiencies reported are found to be much lower than those reported in literature. We demonstrate that the thermodynamic models reported elsewhere can violate the Gibbs criterion and, as a result, lead to unrealistically high efficiencies. The present work offers enhanced understanding of the counter-flow membrane reactor and provides more accurate upper efficiency limits for membrane reactor systems.

Utilization of CO2 in renewable DME fuel production: A life cycle analysis (LCA)-based case study in China

Fuel ◽  
2019 ◽  
Vol 254 ◽  
pp. 115627 ◽  
Author(s):  
Marco Tomatis ◽  
Ashak Mahmud Parvez ◽  
Muhammad T. Afzal ◽  
Sannia Mareta ◽  
Tao Wu ◽  
...  
Keyword(s):  
Life Cycle ◽  
Life Cycle Analysis ◽  
Fuel Production

scholarly journals A versatile ceramic capillary membrane reactor system for continuous enzyme‐catalyzed hydrolysis

2021 ◽  
Author(s):  
Lorn Messner ◽  
Marieke H. Antink ◽  
Tongwei Guo ◽  
Michael Maas ◽  
Sascha Beutel
Keyword(s):  
Membrane Reactor ◽  
Reactor System ◽  
Capillary Membrane

Sampling, characterisation and processing of solid recovered fuel production from municipal solid waste: An Italian plant case study

2017 ◽  
Vol 35 (8) ◽  
pp. 890-898 ◽  
Author(s):  
Ezio Ranieri ◽  
Gabriela Ionescu ◽  
Arcangela Fedele ◽  
Eleonora Palmieri ◽  
Ada Cristina Ranieri ◽  
...  
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Fuel Production

On-site hydrogen production using heavy naphtha by maximizing the hydrogen output of a membrane reactor system

2021 ◽  
Vol 508 ◽  
pp. 230332
Author(s):  
Jae Young Yoo ◽  
Jaemyung Lee ◽  
Gwangwoo Han ◽  
Aadesh Harale ◽  
Sai Katikaneni ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Membrane Reactor ◽  
Reactor System

scholarly journals Increase of power and efficiency of the 900 MW supercritical power plant through incorporation of the ORC

2013 ◽  
Vol 34 (4) ◽  
pp. 51-71 ◽  
Author(s):  
Paweł Ziółkowski ◽  
Dariusz Mikielewicz ◽  
Jarosław Mikielewicz
Keyword(s):  
Power Plant ◽  
Heat Source ◽  
Steam Turbine ◽  
Hybrid System ◽  
Heat Recovery ◽  
Reference Conditions ◽  
Hot Water ◽  
Operational Parameters ◽  
Reference Case ◽  
Unit Power

Abstract The objective of the paper is to analyse thermodynamical and operational parameters of the supercritical power plant with reference conditions as well as following the introduction of the hybrid system incorporating ORC. In ORC the upper heat source is a stream of hot water from the system of heat recovery having temperature of 90 °C, which is additionally aided by heat from the bleeds of the steam turbine. Thermodynamical analysis of the supercritical plant with and without incorporation of ORC was accomplished using computational flow mechanics numerical codes. Investigated were six working fluids such as propane, isobutane, pentane, ethanol, R236ea and R245fa. In the course of calculations determined were primarily the increase of the unit power and efficiency for the reference case and that with the ORC.

A newly designed economizer to improve waste heat recovery: A case study in a pasteurized milk plant

2013 ◽  
Vol 60 (1-2) ◽  
pp. 188-199 ◽  
Author(s):  
Sathit Niamsuwan ◽  
Paisan Kittisupakorn ◽  
Iqbal M. Mujtaba
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Pasteurized Milk

scholarly journals Optimizing Flotation Circuit Recovery by Effective Stage Arrangements: A Case Study

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 417 ◽  
Author(s):  
Vahid Radmehr ◽  
Sied Shafaei ◽  
Mohammad Noaparast ◽  
Hadi Abdollahi
Keyword(s):  
General Rule ◽  
Optimal Recovery ◽  
Operational Parameters ◽  
Matlab Software ◽  
One Stage ◽  
Additional Costs ◽  
Circuit Configuration

Recovery is one of the most important metallurgical parameters in designing and evaluating flotation circuits. The present study used the recovery arrangement for two and three stage circuits to evaluate the effect of stage recovery on the overall circuit recovery and flotation circuit configuration. The results showed that mainly the highest recovery value should be assigned to the rougher stage in order to achieve the maximum overall circuit recovery. Countercurrent rougher-cleaner and rougher-scavenger circuits, in which recycling streams step back one stage at a time, follow a general rule for the assignment of recovery. Finally, a flotation plant containing six flotation banks was examined as a case study. A program for calculating total circuit recovery, for all possible combinations of recovery was developed in MATLAB software. 720 recovery combinations were evaluated. The results showed that optimal recovery allocation in stages could be effective in achieving overall circuit recovery. It was shown that the use of a large number of stages in some of the flotation circuits leads to the loss of equipment and additional costs. The proposed approach can be employed as an effective tool for designing and optimizing various flotation circuits and their operational parameters.

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