Rotary Bed Reactor for Chemical-Looping Combustion with Carbon Capture. Part 1: Reactor Design and Model Development

2012 ◽  
Vol 27 (1) ◽  
pp. 327-343 ◽  
Author(s):  
Zhenlong Zhao ◽  
Tianjiao Chen ◽  
Ahmed F. Ghoniem
Keyword(s):  
Carbon Capture ◽  
Model Development ◽  
Reactor Design ◽  
Chemical Looping Combustion ◽  
Chemical Looping

Perovskite ceramics and recent experimental progress in reactor design for chemical looping combustion application

2015 ◽  
Vol 69 (5) ◽  
Author(s):  
Mina H. Rad ◽  
Mahammad H. Imanieh ◽  
Arunan Nadarajah
Keyword(s):  
Carbon Capture ◽  
Reactor Design ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Carbon Capture And Sequestration ◽  
Novel Method ◽  
Perovskite Ceramics

AbstractChemical looping combustion (CLC) is a novel method of carbon capture and sequestration. It facilitates CO

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 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.

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.

Chemical Looping Combustion: an Emerging Carbon Capture Technology

2015 ◽  
Author(s):  
Frans Snijkers ◽  
Dazheng Jing ◽  
Marijke Jacobs ◽  
Lidia Protasova ◽  
Tobias Mattisson ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Chemical Looping Combustion ◽  
Chemical Looping

scholarly journals Transient Cold Flow Simulation of Fast-Fluidized Bed Air Reactor with Hematite as an Oxygen Carrier for Chemical Looping Combustion

2021 ◽  
Vol 11 (5) ◽  
pp. 2288
Author(s):  
Pulkit Kumar ◽  
Ajit K. Parwani ◽  
Dileep Kumar Gupta ◽  
Vivek Vitankar
Keyword(s):  
Fluidized Bed ◽  
Carbon Capture ◽  
Oxygen Carrier ◽  
Stable Solution ◽  
Flow Simulation ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Discrete Phase Model ◽  
Particle Injection ◽  
Cold Flow

Chemical looping combustion (CLC) is the most reliable carbon capture technology for curtailing CO2 insertion into the atmosphere. This paper presents the cold flow simulation results necessary to understand the hydrodynamic viability of the fast-fluidized bed air reactor. Hematite is selected as an oxygen carrier due to its easy availability and active nature during the reactions. The dense discrete phase model (DDPM) approach using the commercial software Ansys Fluent is applied in the simulation. An accurate and stable solution is achieved using the second-order upwind numerical scheme. A pressure difference of 150 kPa is obtained between the outlet and inlet of the selected air reactor, which is necessary for the movement of the particle. The stable circulating rate of hematite is achieved after 28 s of particle injection inside the air reactor. The results have been validated from the experimental results taken from the literature.

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