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.

Development of CaO-Based Sorbent Doped with Framework Materials for CO2 Capture

2012 ◽  
Vol 518-523 ◽  
pp. 715-719 ◽  
Author(s):  
Chang Tian Liu ◽  
Ying Jie Li ◽  
Rong Yue Sun ◽  
Xin Xie
Keyword(s):  
Titanium Dioxide ◽  
Fluidized Bed ◽  
Potential Solution ◽  
Fluidized Bed Combustion ◽  
Aluminum Oxides ◽  
Framework Materials ◽  
Calcium Looping ◽  
Dual Fluidized Bed ◽  
Capture Capacity

Calcium looping technology is an attractive method for CO2 capture in dual fluidized bed combustion (FBC) reactors. The major limit for this technology is that the capture capacity of CaO-based sorbents sharply decreases with increasing cycle numbers. Attrition and consequent elutriation of CaO-based sorbents from FBC reactors also limit its application. In order to overcome these shortcomings, doping with framework materials is shown as a promising potential solution. Therefore, this work looks at a review of the CO2 capture capacities of CaO-based sorbents doped with different framework materials, such as aluminate cements, kaolin, aluminum oxides, magnesium oxide, titanium dioxide, and lanthanum salt. The synthetic sorbents have a better performance in CO2 capture capacities than the original sorbents in long term carbonation/calcination cycles.

Experimental Studies on Combustion of Cattle Manure in a Fluidized Bed Combustor

1987 ◽  
Vol 109 (2) ◽  
pp. 49-57 ◽  
Author(s):  
K. Annamalai ◽  
M. Y. Ibrahim ◽  
J. M. Sweeten
Keyword(s):  
Fluidized Bed ◽  
Fossil Fuels ◽  
Experimental Studies ◽  
Heat Content ◽  
Fluidized Bed Combustion ◽  
Volatile Solids ◽  
Combustion Technology ◽  
Solids Content ◽  
Combustion Tests ◽  
Fluidized Bed Combustor

Manure from cattle feedlots is a renewable energy source which has the potential of supplementing the existing fossil fuels. But the heat content of manure is rather low. Since, the fluidized bed combustion technology has been used for the energy conversion of marginal fuels, such a technology is being explored for the combustion of feedlot manure. A fluidized bed combustor of 0.15 m (6 in.) diameter was used for the combustion tests on manure. Experiments were conducted with −20 to +20 percent excess air and at bed temperatures ranging from 600°C (1112°F) to 800°C (1472°F). Experimental data revealed that the gasification efficiencies ranged from 90 to 98 percent, while the combustion efficiencies varied from 45 to 85 percent. Higher combustion efficiencies were obtained with decreased volatile solids content of manure. The low combustion efficiencies are attributed to the limited residence time available for the volatiles to burn within the reactor.

scholarly journals Development of the Strength of the Fluidized Bed Combustion Fly Ash Based Geopolymer in Time

2020 ◽  
Author(s):  
Natalia Paszek ◽  
Marcin Górski
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Fluidized Bed ◽  
Curing Temperature ◽  
Hard Coal ◽  
Curing Process ◽  
Fluidized Bed Combustion ◽  
Curing Conditions ◽  
Fbc Fly Ash ◽  
Over Time

ThispaperpresentsastudyintothemechanicalbehaviourofFluidizedBedCombustion (FBC)fly ash-based geopolymer.FBCflyashisaby-product of a burning of a solid fuel (hard coal in case of this study) in a furnace at a low temperature. FBC fly ash is a type of a waste which is more difficult to recycle than pulverized fly ash.UsingFBCflyashin geopolymers offers one possible way to recycle it. The main goals of the investigation were to determine the influence of curing temperature and curing conditions on the strength of FBC fly ash-based geopolymer; to determine the changes of strength over time and the changes of the temperature inside the geopolymer during the curing process. Tests have shown that the strength of the geopolymer generally increases in line with the increase of a curing temperature. The compressive strength stabilizes after 5 days of curing and yet continues to gain extra strength over the longer term. Theflexuralbehaviourisnotmonotonicandthereforehardtopredict.The temperature inside the geopolymer rises rapidly until reaching around 27.5°C and then decreases steadily. Keywords: geopolymer, Fluidized Bed Combustion Fly ash, temperature, strength

Oxy-fuel Combustion of Wheat Straw Pellets in a Lab-Scale Fluidized Bed Combustor

2018 ◽  
pp. 375-386
Author(s):  
Monika Kosowska-Golachowska ◽  
Henryk Otwinowski ◽  
Krzysztof Wolski ◽  
Agnieszka Kijo-Kleczkowska ◽  
Tomasz Musiał ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Fluidized Bed ◽  
Fuel Combustion ◽  
Fluidized Bed Combustor

Effect of leaching on the ash behavior of wheat straw and olive residue during fluidized bed combustion

2001 ◽  
Vol 20 (6) ◽  
pp. 459-470 ◽  
Author(s):  
S. Arvelakis ◽  
P. Vourliotis ◽  
E. Kakaras ◽  
E.G. Koukios
Keyword(s):  
Wheat Straw ◽  
Fluidized Bed ◽  
Fluidized Bed Combustion ◽  
Olive Residue
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