scholarly journals Large scale in silico screening of materials for carbon capture through chemical looping

2017 ◽  
Vol 10 (3) ◽  
pp. 818-831 ◽  
Author(s):  
Cindy Y. Lau ◽  
Matthew T. Dunstan ◽  
Wenting Hu ◽  
Clare P. Grey ◽  
Stuart A. Scott
Keyword(s):  
In Silico ◽  
Carbon Capture ◽  
Large Scale ◽  
Experimental Validation ◽  
Experimental Methodology ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
New Materials ◽  
In Silico Screening

A combined computational and experimental methodology is developed to predict new materials that can reversibly produce oxygen for chemical looping combustion, and then promising candidates are selected for experimental validation of these predictions.

scholarly journals Characteristic Study of Briquette Cyanobacteria as Fuel in Chemical Looping Combustion with Hematite as Oxygen Carrier

2021 ◽  
Vol 11 (10) ◽  
pp. 4388
Author(s):  
Haifeng Zhang ◽  
Laihong Shen ◽  
Huijun Ge ◽  
Hongcun Bai
Keyword(s):  
Large Scale ◽  
Oxygen Carrier ◽  
Compressive Load ◽  
Phosphorus Recovery ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Carbon Conversion ◽  
Nitrogen And Phosphorus ◽  
Liquid Products ◽  
Lower Temperature

Due to the more and more serious cyanobacteria bloom problem, it is particularly urgent to find a technology suitable for large-scale disposal and the efficient recovery of abundant nitrogen and phosphorus resources in cyanobacteria. The combination of chemical looping combustion (CLC) and biomass densification technology is thought to be a promising utilization selection. Based on the experimental results, the mechanical strength and energy density of briquette cyanobacteria are evidently increased with the compressive load; whereas, 10% is the optimal moisture content in the densification process. A higher heating rate in TGA would result in the damage of the internal structure of the briquette cyanobacteria, which are conducive to the carbon conversion efficiency. The presence of a hematite oxygen carrier would enhance the carbon conversion and catalyzed crack liquid products. CO2 yield is increased 25 percent and CH4 yield is decreased 50 percent at 900 °C in the CLC process. In addition, the lower temperature and reduction atmosphere in CLC would result in a lower NO emission concentration. The reactivity and porous property of hematite OC in CLC also increased during 10 redox cycle experiments. The CLC process accelerates the generation of CaH2P2O7 and CaHPO4 in cyanobacteria ash, which is more conducive to phosphorus recovery.

scholarly journals Chemical looping reforming in packed-bed reactors: Modelling, experimental validation and large-scale reactor design

2017 ◽  
Vol 156 ◽  
pp. 156-170 ◽  
Author(s):  
V. Spallina ◽  
B. Marinello ◽  
F. Gallucci ◽  
M.C. Romano ◽  
M. Van Sint Annaland
Keyword(s):  
Large Scale ◽  
Experimental Validation ◽  
Packed Bed ◽  
Reactor Design ◽  
Chemical Looping ◽  
Packed Bed Reactors ◽  
Scale Reactor

Large-scale in silico screening of compounds contained in printing inks for food packaging materials

2018 ◽  
Vol 295 ◽  
pp. S96
Author(s):  
M. Smieško ◽  
C. Don ◽  
R. Meuwly ◽  
S. Kucsera ◽  
B.J. Brüschweiler
Keyword(s):  
In Silico ◽  
Food Packaging ◽  
Large Scale ◽  
Packaging Materials ◽  
In Silico Screening ◽  
Food Packaging Materials ◽  
Printing Inks

A Pb/Zn Based Chemical Looping System for Hydrogen and Power Production With Carbon Capture

2011 ◽  
Author(s):  
Niall R. McGlashan ◽  
Peter R. N. Childs ◽  
Andrew L. Heyes
Keyword(s):  
Power System ◽  
Flue Gas ◽  
Power Output ◽  
Carbon Capture ◽  
Oxygen Carrier ◽  
Fluid Phase ◽  
Chemical Looping Combustion ◽  
Inlet Temperature ◽  
Chemical Looping ◽  
Lower Efficiency

This paper describes an extension of a novel, carbon-burning, fluid phase chemical looping combustion system proposed previously. The system generates both power and H2 with ‘inherent’ carbon capture using chemical looping combustion (CLC) to perform the main energy release from the fuel. A mixed Pb and Zn based oxygen carrier is used, and due to the thermodynamics of the carbothermic reduction of PbO and ZnO respectively, the system generates a flue gas which consists of a mixture of CO2 and CO. By product H2 is generated from this flue gas using the water-gas shift reaction (WGSR). By varying the proportion of Pb to Zn circulating in the chemical loop, the ratio of CO2 to CO can be controlled, which in turn enables the ratio between the amount of H2 produced to the amount of power generated to be adjusted. By this means, the power output from the system can be ‘turned down’ in periods of low electricity demand without requiring plant shutdown. To facilitate the adjustment of the Pb/Zn ratio, use is made of the two metal’s mutual insolubility, as this means they form in to two liquid layers at the base of the reduction reactor. The amount of Pb and Zn rich liquid drawn from the two layers and subsequently circulated around the system is controlled thereby varying the Pb/Zn ratio. To drive the endothermic reduction of ZnO formed in the oxidiser, hot Zn vapour is ‘blown’ into the reducer where it condenses, releasing latent heat. The Zn vapour to produce this ‘blast’ of hot gas is generated in a flash vessel fed with hot liquid metal extracted from the oxidiser. A mass and energy balance has been conducted for a power system, operating on the Pb/Zn cycle. In the analysis, reactions are assumed to reach equilibrium and losses associated with turbomachinery are considered; however, pressure losses in equipment and pipework are assumed to be negligible. The analysis reveals that a power system with a second law efficiency of between 62% and 68% can be constructed with a peak turbine inlet temperature of only ca. 1850 K. The efficiency varies as the ratio between power and H2 production varies, with the lower efficiency occurring at the maximum power output condition.

scholarly journals In silico screening of carbon-capture materials

2012 ◽  
Vol 11 (7) ◽  
pp. 633-641 ◽  
Author(s):  
Li-Chiang Lin ◽  
Adam H. Berger ◽  
Richard L. Martin ◽  
Jihan Kim ◽  
Joseph A. Swisher ◽  
...  
Keyword(s):  
In Silico ◽  
Carbon Capture ◽  
In Silico Screening

scholarly journals Transient Simulations of Spouted Fluidized Bed for Coal-Direct Chemical Looping Combustion

2014 ◽  
Author(s):  
Zheming Zhang ◽  
Ramesh Agarwal
Keyword(s):  
Carbon Capture ◽  
Power Plants ◽  
High Efficiency ◽  
Combustion Process ◽  
Chemical Looping Combustion ◽  
Successful Implementation ◽  
Chemical Looping ◽  
Two Phase ◽  
Coal Particles ◽  
Fuel Reactor

Chemical-looping combustion holds significant promise as one of the next generation combustion technology for high-efficiency low-cost carbon capture from fossil fuel power plants. For thorough understanding of the chemical-looping combustion process and its successful implementation in CLC based industrial scale power plants, the development of high-fidelity modeling and simulation tools becomes essential for analysis and evaluation of efficient and cost effective designs. In this paper, multiphase flow simulations of coal-direct chemical-looping combustion process are performed using ANSYS Fluent CFD code. The details of solid-gas two-phase hydrodynamics in the CLC process are investigated by employing the Lagrangian particle-tracking approach called the discrete element method (DEM) for the movement and interaction of solid coal particles moving inside the gaseous medium created due to the combustion of coal particles with an oxidizer. The CFD/DEM simulations show excellent agreement with the experimental results obtained in a laboratory scale fuel reactor in cold flow conditions. More importantly, simulations provide important insights for making changes in fuel reactor configuration design that have resulted in significantly enhanced performance.

scholarly journals Evaluating Algae as an Alternative Fuel for Chemical Looping Combustion

2018 ◽  
Vol 5 ◽  
pp. 37-55
Author(s):  
Catherine Williams ◽  
Sam Bentley ◽  
Chris Peramatukorn ◽  
Hamza Rafi
Keyword(s):  
Energy Balance ◽  
Chlorella Vulgaris ◽  
Carbon Capture ◽  
Energy Generation ◽  
Energy Output ◽  
Chemical Looping Combustion ◽  
Enthalpy Of Reaction ◽  
Chemical Looping ◽  
Efficiency Ratio ◽  
Fluidised Beds

Chemical Looping Combustion (CLC) and Chemical Looping with Oxygen Uncoupling (CLOU) are low-pollution energy generation techniques conventionally utilizing natural gas or synthetic gas as fuel. Using a redox reaction of metal oxides in dual fluidised beds, CO2 can be captured and prevented from entering the atmosphere at efficiencies up to 80% [4,8]. Algae is a sustainable source of biofuel with the additional benefit of carbon capture through photosynthesis [7]. This Meta-Study attempts to determine the viability of algae as CLC/CLOU reactor fuel for long term sustainable energy generation by identifying trends in different fuels and reactants to see if algae fuel can produce an acceptable output and identify areas of weakness. Energy balance calculations were performed as well as thermal energy output, processing energy and enthalpy values. Graciliara sp. and Chlorella Vulgaris made the most effective fuels for CLC and CLOU respectively due to the low amount of algae required to produce fuel. For CLC, 3.57kg Graciliara sp. produced 1kg fuel. For CLOU, 1.7kg Chlorella Vulgaris produced 1kg fuel. CLOU was the most mass efficient with an energy/mass efficiency ratio of 11600kJ/kg compared to CLC’s 15.7kJ/kg. The energy balance ratio analysis of the production of algal fuel also identified Chlorella Vulgaris as the best fuel, with an EBR of -0.4 in CLOU. In terms of evaluating output, CLOU's energy/mass efficiency ratio surpassed a modern coal plant [45], whose value was 2840 kJ/kg. The defining factor was the enthalpy of reaction.

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