scholarly journals Experimental Investigation on Mixing and Segregation Behavior of Oxygen Carrier and Biomass Particle in Fluidized Bed

2019 ◽  
Vol 63 (3) ◽  
pp. 188-194 ◽  
Author(s):  
Botond Szücs ◽  
Pál Szentannai
Keyword(s):  
Fluidized Bed ◽  
Alternative Fuels ◽  
Oxygen Carrier ◽  
Spherical Shape ◽  
Chemical Looping Combustion ◽  
Solid Fuels ◽  
Chemical Looping ◽  
Carbon Reduction ◽  
Active Particles ◽  
Fuel Particles

In this work, lab-scale cold fluidization equipment is designed and constructed to investigate the mixing and segregating phenomena of binary fluidized beds. The focus of the investigation is carbon reduction with the fluidized bed technology-based Chemical Looping Combustion (CLC). Nowadays, aspiration to carbon reduction focuses on the solid fuels. Therefore, it is of great importance to integrate the benefits of CLC technology with the use of solid fuels. The measurements of fuel particles in the fluidized bed are extended from the homogeneous and spherical shape to the inhomogeneous, non-spherical shape. During the tests, an iron-based oxygen carrier (OC) for chemical looping combustors is examined with different particle sizes. In addition, the tests included the examination of three different fuel samples (crushed coal, agricultural pellet, and Solid Recovered Fuel (SRF)), which can be utilized in chemical looping combustion with In-situ gasification. The experiments are carried out using the bed-frozen method. With this method, the vertical concentration of active particles could be measured. The results show that the particle size of the oxygen carrier does fundamentally influence its vertical placement, and the non-spherical character of most alternative fuels must also be considered for optimal reactor design.

scholarly journals Modeling of the Chemical Looping Combustion of Hard Coal and Biomass Using Ilmenite as the Oxygen Carrier

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5394
Author(s):  
Anna Zylka ◽  
Jaroslaw Krzywanski ◽  
Tomasz Czakiert ◽  
Kamil Idziak ◽  
Marcin Sosnowski ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Oxygen Carrier ◽  
Experimental Tests ◽  
Chemical Looping Combustion ◽  
Hard Coal ◽  
Chemical Looping ◽  
Simulation Accuracy ◽  
Energy Technologies ◽  
Fuel Reactor ◽  
Relative Errors

This paper presents a 1.5D model of a fluidized bed chemical looping combustion (CLC) built with the use of a comprehensive simulator of fluidized and moving bed equipment (CeSFaMB) simulator. The model is capable of calculating the effect of gas velocity in the fuel reactor on the hydrodynamics of the fluidized bed and the kinetics of the CLC process. Mass of solids in re actors, solid circulating rates, particle residence time, and the number of particle cycles in the air and fuel reactor are considered within the study. Moreover, the presented model calculates essential emissions such as CO2, SOX, NOX, and O2. The model was successfully validated on experimental tests that were carried out on the Fluidized-Bed Chemical-Looping-Combustion of Solid-Fuels unit located at the Institute of Advanced Energy Technologies, Czestochowa University of Technology, Poland. The model’s validation showed that the maximum relative errors between simulations and experiment results do not exceed 10%. The CeSFaMB model is an optimum compromise among simulation accuracy, computational resources, and processing time.

scholarly journals Titanium substituted manganese-ferrite as an oxygen carrier with permanent magnetic properties for chemical looping combustion of solid fuels

Fuel ◽  
2017 ◽  
Vol 195 ◽  
pp. 38-48 ◽  
Author(s):  
María Abián ◽  
Alberto Abad ◽  
María T. Izquierdo ◽  
Pilar Gayán ◽  
Luis F. de Diego ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Solid Fuels ◽  
Chemical Looping ◽  
Manganese Ferrite ◽  
Combustion Of Solid Fuels

scholarly journals Use of ilmenite as an oxygen carrier in chemical looping combustion-batch and continuous dual fluidized bed investigation

2011 ◽  
Vol 4 ◽  
pp. 433-440 ◽  
Author(s):  
A.R. Bidwe ◽  
F. Mayer ◽  
C. Hawthorne ◽  
A. Charitos ◽  
A. Schuster ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Dual Fluidized Bed

Chemical looping combustion of coal in a 5 kWth interconnected fluidized bed reactor using hematite as oxygen carrier

2015 ◽  
Vol 157 ◽  
pp. 304-313 ◽  
Author(s):  
Jinchen Ma ◽  
Haibo Zhao ◽  
Xin Tian ◽  
Yijie Wei ◽  
Sharmen Rajendran ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Oxygen Carrier ◽  
Fluidized Bed Reactor ◽  
Chemical Looping Combustion ◽  
Chemical Looping

Studies on Solids Flow in a Cold Model of a Dual Fluidized Bed Reactor for Chemical Looping Combustion of Solid Fuels

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Kamil Idziak ◽  
Tomasz Czakiert ◽  
Jaroslaw Krzywanski ◽  
Anna Zylka ◽  
Wojciech Nowak
Keyword(s):  
Fluidized Bed ◽  
Pressure Sensors ◽  
Fluidized Bed Reactor ◽  
Chemical Looping Combustion ◽  
Solid Fuels ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Cold Model ◽  
Dual Fluidized Bed ◽  
Combustion Of Solid Fuels

Abstract The results of investigations on solids flow in a cold model of the dual fluidized bed reactor designed for chemical looping combustion of solid fuels (DFB-CLC-SF) are presented in this paper. The constructed unit consists of two interconnected reactors. The first one, so-called fuel reactor (FR), is operated under bubbling fluidized bed (BFB) conditions, whereas the second one, so-called air reactor (AR), is structurally divided into two sections. The bottom part of AR works under BFB while the upper part, i.e., the riser, is operated in the fast fluidized bed (FFB) regime. In these studies, the air was used for fluidization process in all parts of the DFB-CLC-SF reactor. The glass beads with similar parameters to oxygen carriers (OCs) used in the CLC process were utilized as an inventory. The fluidization conditions are controlled by using the sets of pressure sensors installed around the circulation loop. The experimental data acquired in the tests are further employed to the analysis of solids behavior in a cold model of the DFB-CLC-SF reactor. The main goal of these studies was to establish the conditions for smooth fluidization, which concurrently provide the required residence time of solids in both reactors that is one of the most crucial factors in the CLC process. It was found that the fluidizing gas velocity in reactors has a significant impact on solids behavior and the investigated parameters. However, what is the most important, it was confirmed that the operation condition of the DFB-CLC-SF reactor can be adjusted to meet the requirements resulting from the properties of OCs.

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