Circulating-Fluidized-Bed-Based Calcium-Looping Gasifier: Experimental Studies on the Calcination–Carbonation Cycle

2012 ◽  
Vol 51 (25) ◽  
pp. 8652-8660 ◽  
Author(s):  
Bishnu Acharya ◽  
Animesh Dutta ◽  
Prabir Basu
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Experimental Studies ◽  
Calcium Looping

Continuous protein recovery using a liquid-solid circulating fluidized bed ion exchange system: Modelling and experimental studies

2000 ◽  
Vol 78 (5) ◽  
pp. 858-866 ◽  
Author(s):  
Qingdao Lan ◽  
Jing-Xu Jesse Zhu ◽  
Amarjeet S. Bassi ◽  
Argyrios Margaritis ◽  
Ying Zheng ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Experimental Studies ◽  
Protein Recovery ◽  
System Modelling ◽  
Exchange System

A Two-Step Water Splitting With Ferrite Particles and Its New Reactor Concept Using an Internally Circulating Fludized-Bed

Solar Energy ◽  
2006 ◽  
Author(s):  
Nobuyuki Gokon ◽  
Takayuki Mizuno ◽  
Shingo Takahashi ◽  
Tatsuya Kodama
Keyword(s):  
Fluidized Bed ◽  
Water Splitting ◽  
Circulating Fluidized Bed ◽  
Experimental Studies ◽  
Redox System ◽  
Chemical Reactor ◽  
Inert Atmosphere ◽  
Zro2 Particle ◽  
Concentrated Solar Radiation ◽  
Particle Bed

A thermochemical two-step water splitting cycle using a redox system of iron-based oxides or ferrites is one of the promising processes for converting and storing solar energy into a fuel in sunbelt regions. The ZrO2-supported ferrite (or the ferrite/ZrO2) powders exhibit superior performances on activity and repeatability of the cyclic reactions when compared to conventional unsupported ferrites. In the first step at 1400°C under an inert atmosphere, ferrite on ZrO2 support is thermally decomposed to the reduced phase of wustite that is oxidized back to ferrite on ZrO2 with steam in a separate second step at 1000°C. In this paper, a number of ZrO2-supporetd ferrites, Mn-, Mg-, Co-, Ni- and Co-Mn-ferrites, are examined on activity. The NiFe2O4/ZrO2 powder was found to have a greatest activity between them. This paper also describes a new concept of a windowed solar chemical reactor using an internally circulating fluidized bed of ferrite/ZrO2 particles. In this concept, concentrated solar radiation passes downwards through the transparent window and directly heats the internally circulating fluidized bed. The exploratory experimental studies on this reactor concept are carried out in a laboratory scale for the thermal decomposition of NiFe2O4/ZrO2 particle bed as part of two-step water splitting cycle.

scholarly journals Oxy-Fuel Combustion of Hard Coal, Wheat Straw, and Solid Recovered Fuel in a 200 kWth Calcium Looping CFB Calciner

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2162
Author(s):  
Joseba Moreno ◽  
Matthias Hornberger ◽  
Max Schmid ◽  
Günter Scheffknecht
Keyword(s):  
Wheat Straw ◽  
Fluidized Bed ◽  
Alternative Fuels ◽  
Experimental Studies ◽  
Carbon Capture And Storage ◽  
Fuel Combustion ◽  
Experimental Investigations ◽  
Hard Coal ◽  
Fluidized Bed Combustion ◽  
Calcium Looping

The fluidized bed combustion (FBC) of biomass and solid recovered fuel (SRF) is globally emerging as a viable solution to achieve net-negative carbon emissions in the heat and power sector. Contrary to conventional fossil fuels, alternative fuels are highly heterogeneous, and usually contain increased amounts of alkaline metals and chlorine. Hence, experimental studies are mandatory in order to thoroughly characterize the combustion behavior and pollutant formation of non-conventional fuels in novel applications. This work gives an overview of experimental investigations on the oxy-fuel combustion of hard coal, wheat straw, and SRF with a limestone bed in a semi-industrial circulating fluidized bed (CFB) pilot plant. The CFB combustor was able to be operated under different fuel blending ratios and inlet O2 concentrations, showing a stable hydrodynamic behavior over many hours of continuous operation. The boundary conditions introduced in this study are expected to prevail in carbon capture and storage (CCS) processes, such as the oxy-fuel combustion in the CFB calciner of a Calcium Looping (CaL) cycle for post-combustion CO2 capture.

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