Simultaneous Reduction of Nox, N2O, SO2 Emissions from a Fluidized Bed Coal Combustor Using Alternative Bed Material.

2003 ◽  
Vol 36 (7) ◽  
pp. 782-787 ◽  
Author(s):  
Tadaaki Shimizu ◽  
Jun Asazuma ◽  
Masayuki Shinkai ◽  
Sayako Matsunaga ◽  
Kazuaki Yamagiwa ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
So2 Emissions ◽  
Simultaneous Reduction ◽  
Reduction Of Nox ◽  
Bed Material

Simultaneous reduction of NOx and SO2 emissions from coal combustion by calcium magnesium acetate

Fuel ◽  
2004 ◽  
Vol 83 (2) ◽  
pp. 149-155 ◽  
Author(s):  
W. Nimmo ◽  
A.A. Patsias ◽  
E. Hampartsoumian ◽  
B.M. Gibbs ◽  
P.T. Williams
Keyword(s):  
Coal Combustion ◽  
Magnesium Acetate ◽  
So2 Emissions ◽  
Simultaneous Reduction ◽  
Calcium Magnesium Acetate ◽  
Calcium Magnesium ◽  
Reduction Of Nox

scholarly journals Parametric Study on the Adjustability of the Syngas Composition by Sorption-Enhanced Gasification in a Dual-Fluidized Bed Pilot Plant

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 399
Author(s):  
Selina Hafner ◽  
Max Schmid ◽  
Günter Scheffknecht
Keyword(s):  
Fluidized Bed ◽  
Ghg Emissions ◽  
Space Velocity ◽  
Synthesis Process ◽  
Wood Pellets ◽  
High Hydrogen ◽  
Syngas Production ◽  
Dual Fluidized Bed ◽  
Bed Material ◽  
Gasification Temperature

Finding a way for mitigating climate change is one of the main challenges of our generation. Sorption-enhanced gasification (SEG) is a process by which syngas as an important intermediate for the synthesis of e.g., dimethyl ether (DME), bio-synthetic natural gas (SNG) and Fischer–Tropsch (FT) products or hydrogen can be produced by using biomass as feedstock. It can, therefore, contribute to a replacement for fossil fuels to reduce greenhouse gas (GHG) emissions. SEG is an indirect gasification process that is operated in a dual-fluidized bed (DFB) reactor. By the use of a CO2-active sorbent as bed material, CO2 that is produced during gasification is directly captured. The resulting enhancement of the water–gas shift reaction enables the production of a syngas with high hydrogen content and adjustable H2/CO/CO2-ratio. Tests were conducted in a 200 kW DFB pilot-scale facility under industrially relevant conditions to analyze the influence of gasification temperature, steam to carbon (S/C) ratio and weight hourly space velocity (WHSV) on the syngas production, using wood pellets as feedstock and limestone as bed material. Results revealed a strong dependency of the syngas composition on the gasification temperature in terms of permanent gases, light hydrocarbons and tars. Also, S/C ratio and WHSV are parameters that can contribute to adjusting the syngas properties in such a way that it is optimized for a specific downstream synthesis process.

scholarly journals Atmospheric fluidized bed gasification of promising biomass fuels in southern European regions

2007 ◽  
Vol 11 (1) ◽  
pp. 5-15 ◽  
Author(s):  
Kyriakos Panopoulos ◽  
Lydia Fryda ◽  
Emmanuel Kakaras
Keyword(s):  
Fluidized Bed ◽  
Lignin Content ◽  
Giant Reed ◽  
Co2 Production ◽  
European Regions ◽  
Biomass Fuels ◽  
Product Gas ◽  
Sorghum Bagasse ◽  
Bed Material ◽  
The Impact

Three promising biomass fuels from southern European regions were gasified atmospherically with air in a lab-scale fluidized bed reactor with quartz or olivine as bed material. The fuels used were an agro-industrial residue (olive bagasse) and the energy crops giant reed and sweet sorghum bagasse. Varying air ratios and temperatures were tested to study the impact on the product gas composition and tar load. Tars were higher in the case of olive bagasse, attributed to its higher lignin content compared to the other two biomasses with higher cellulose. Giant reed gasification causes agglomeration and defluidisation problems at 790?C while olive bagasse shows the least agglomeration tendency. The particular olivine material promoted the destruction of tars, but to a lesser level than other reported works; this was attributed to its limited iron content. It also promoted the H2 and CO2 production while CO content decreased. Methane yield was slightly affected (decreased) with olivine, higher temperatures, and air ratios. Air ratio increase decreased the tar load but at the same time the gas quality deteriorated. .

scholarly journals Feasibility Study of Using Carbide Slag as In-Bed Desulfurizer in Circulating Fluidized Bed Boiler

2019 ◽  
Vol 9 (21) ◽  
pp. 4517 ◽  
Author(s):  
Zhong Huang ◽  
Jimiao Long ◽  
Lei Deng ◽  
Defu Che
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Separation Efficiency ◽  
Molar Fraction ◽  
So2 Emissions ◽  
Cfb Boiler ◽  
Carbide Slag ◽  
Desulfurization Efficiency ◽  
Sintering Resistance ◽  
Pilot Tests

Carbide slag is a waste residue during the production of acetylene. Due to its high content of Ca(OH)2, carbide slag becomes a potential alternative to limestone as the in-bed desulfurizer of circulating fluidized bed (CFB) boilers. In this study, the calcination and sulfation characteristics of carbide slag were investigated by three different facilities, thermogravimetric analyzer (TGA), 1 MWth pilot CFB boiler, and 690 t·h−1 CFB boiler. Pore structures and sulfation behaviors of carbide slag and limestone were investigated for the sake of comparison. The results showed that carbide slag has a lower calcination temperature than limestone. Its calcined product has a better pore structure and desulfurization activity. The carbide slag exhibited a higher desulfurization efficiency than the limestone in the pilot tests. The SO2 emission concentration showed a downward trend with the increase of molar fraction of carbide slag in the desulfurizer. Meanwhile, carbide slag had a better sintering-resistance property, which makes it possible to effectively reduce SO2 emissions even at high combustion temperatures (>910 °C). While the field test results were similar to that of the pilot tests, the desulfurization efficiency of carbide slag with the same Ca/S mole ratio was higher than that of limestone. The fine size of carbide slag particles and the lower separation efficiency of the cyclone on the 690 t·h−1 boiler left the carbide slag with insufficient residence time in the furnace. Therefore, it is necessary to ensure a high separation efficiency of the cyclone if the carbide slag is used as an alternative desulfurizer in furnace.

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