The role of limestone during fluidized bed oxy-combustion of coal and biomass

Lupiáñez, Carlos; Mayoral, M.C.; Díez, Luis I.; Pueyo, E.; Espatolero, Sergio; Andrés, José Manuel Palao

doi:10.1016/j.apenergy.2016.11.018

Cited by 32 publications

(8 citation statements)

References 59 publications

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“…In Calcium Looping applications, both SO 2 and HCl are strongly suppressed due to (i) operation in a very favorable absorption temperature window [27,36] and (ii) an exceptionally high supply of calcium. The supply of calcium which is available for SO 2 and HCl absorption is several magnitudes higher than that generally foreseen to remove SO 2 [25] and HCl [37] in fluidized bed combustion systems, yielding an almost sulfur-and chlorine-free flue gas.…”

Section: Acidic Gases (So 2 and Hcl)mentioning

confidence: 91%

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

et al. 2021

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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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Section: Acidic Gases (So 2 and Hcl)mentioning

confidence: 91%

“…During combustion, alkali metals (M) and chloride are easily vaporized and released as alkali chlorides (MCl) into the flue gas. The gaseous alkali chlorides are then converted to alkali sulfates (M 2 SO 4 ) through a homogeneous reaction with sulfur oxides and water vapor with or without oxygen (please refer to [25] for more details):…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…In the subsequent studies [15,16] Lupiáñez and co-workers investigated the influence of limestone on gaseous emissions during oxy-combustion of lignite and corn stover in the fluidized-bed combustor described in the previous paper. The author founded that the SO 2 capture was influence by the limestone type and fragmentation of its particles.…”

Section: Literature Reviewmentioning

confidence: 99%

“…According to results presented by Lupianez et al [14][15][16], a high level of CO in the flue gas is a result of incomplete combustion, which is a symptom of lower combustion efficiency. Thus, in this case, the reduction of NO to N 2 is a consequence of such deficiency (Figure 19).…”

Section: Co Emissionsmentioning

confidence: 99%

Pollutant Emissions during Oxy-Fuel Combustion of Biomass in a Bench Scale CFB Combustor

2022

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Nowadays oxy-fuel combustion of coal and biomass is the most promising option for the reduction of CO2 emissions from power plants. In this paper, emissions of NOx (NO, NO2, N2O and their precursors, such as NH3 and HCN), SO2 and CO during conventional and oxy-fuel combustion of three kinds of biomass (agro, woody and energy crop) and a reference coal are presented and discussed. Combustion tests were conducted at 850 °C in the laboratory-scale circulating fluidized bed (CFB) reactor in air and O2/CO2 atmospheres. A FTIR spectrometer was used to measure instantaneous concentrations of all pollutants in the flue gas. Emissions of SO2, N2O and CO for the combustion of biomass in all atmospheres were lower than those for the combustion of reference coal. It was found that oxidation of nitrogen species released with volatile matter was responsible for high emissions of NOx during combustion of biomass fuels in air and mixtures of O2 and CO2. The lowest NO emissions for tested fuels were detected in oxy-21 atmosphere (21% O2/70% CO2). Oxy-combustion of biomass in O2/CO2 mixtures at 30% and 40% O2 caused a decrease in emissions of N2O and CO while NO and SO2 emissions increased. The results of this study show that the tested biomass fuels are ideal renewable energy resources both in conventional and oxy-fuel conditions with a minor potential for environmental pollution.

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“…Co-firing different coal types has been studied earlier [3,7,9,[30][31][32][33][34][35][36] to reduce harmful emissions from coal combustion. Co-firing renewable fuels such as biomass along with coal is also a promising technique for reducing pollutants from coal combustion as well [37][38][39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Observations on the combustion of torrefied biomass

Tarakcioglu¹

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This thesis examines observations on the combustion of different types of torrefied biomass. The targeted biomass types were waste crop, herbaceous, and woody; they included Corn straw, DDGS, Rice husk, Miscanthus, Bagasse, and Beechwood. Combustion of renewable biomass is of technological interest because it is considered to be nearly carbon-neutral. Furthermore, torrefaction of biomass improves the raw biomass properties and makes more "coal-like".Torrefied biomass has lower volatile matter content, higher fixed carbon content and higher energy content than raw biomass. It is also having low moisture content and it is less biodegradable. In this work, all biomass samples were torrefied at T= 275 °C for half an hour in nitrogen. Thereafter, torrefied biomass was size classified by sieving to obtain size cuts of (75-90) µm, (180-212) µm, (180-212) µm, (212-300) µm, (300-350) µm, (350-500) µm. The experimental setup that was used in this investigation consisted of an electrically-heated drop-tube furnace, operated at wall temperature 1400 K. A three-color pyrometer was interfaced with the furnace and a high-speed high-resolution camera, to record the entire luminous particle combustion profiles of individual particles.As identification of the maximum biomass particle size for combustion in an existing boiler is important, this work observed the time-temperature profiles of the aforementioned particle size and contrasted them to those of typically-used coal particles. It was forward that torrefied biomass particles in the size range of 212−300 μm burned in similar times as those of 75-90 μm coal.

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The role of limestone during fluidized bed oxy-combustion of coal and biomass

Cited by 32 publications

References 59 publications

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

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

Pollutant Emissions during Oxy-Fuel Combustion of Biomass in a Bench Scale CFB Combustor

Observations on the combustion of torrefied biomass

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