External bed materials for the oxy-fuel combustion of biomass in a bubbling fluidized bed

Vodička, Matěj; Michaliková, Kristýna; Hrdlička, Jan; Hofbauer, Cornelia; Winter, Franz; Skopec, Pavel; Jeníková, Jitka

doi:10.1016/j.jclepro.2021.128882

Cited by 9 publications

(4 citation statements)

References 53 publications

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“…The measurement results of each test show an increase in temperature between 10% and 15%, as shown in Based on the test results, modifying the plates in the combustion chamber can increase the combustion temperature. In addition, improving the plates in the combustion chamber can also increase the burning time (Vodička et al, 2021). Where was their research?…”

Section: Resultsmentioning

confidence: 99%

Comparison of Temperature, Radiation Rate, Heat Loss, Furnace and Thermal Efficiencies of Different Plates in the FBC Combustion Chamber

Erdiwansyah¹,

Mahidin²,

Husin³

et al. 2023

Front. Heat Mass Transf.

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The conversion of solid biomass waste into energy continues to be developed at this time to reduce dependence on fossil energy. Energy conversion can be carried out using several technologies commercialized by several industries, including the fluidized-bed combustor (FBC). This FBC technology has also been developed in several ways, such as the modification or unique modelling. In particular, the perforated plate modelling applied in this study is to provide excess air supply so that complete combustion can be achieved. In addition, modifying the perforated plate increases efficiency and radiation and reduces heat loss in the FBC combustion chamber. This research was conducted with combustion experiments using palm kernel shell (PKS), oil palm midrib (OPM), and empty fruit bunches (EFB) against different plates. Experimental results show that the maximum temperature achieved on the modified four guide plates is 975 o C for PKS fuel, 850 o C OPM, and 883 o C EFB with 20% -70% excess air. The results of the highest furnace efficiency on the four guide plate modifications were 91.44% PKS, 73.48% OPM, and 77.63% EFB. Meanwhile, the highest efficiency recorded from modifying the four guide plates for each fuel was 84% PKS, 73% OPM and 74% EFB. The highest radiation rates were recorded at 7745.21 W/sec PKS, 5971.17 W/sec OPM, and 6356.12 W/sec EFB. The perforated plate modification applied in the FBC combustion chamber can reduce heat loss significantly compared to when implementing standard plates.

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Section: Resultsmentioning

confidence: 99%

Comparison of Temperature, Radiation Rate, Heat Loss, Furnace and Thermal Efficiencies of Different Plates in the FBC Combustion Chamber

Erdiwansyah¹,

Mahidin²,

Husin³

et al. 2023

Front. Heat Mass Transf.

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“…During experiments with lignite coal, its inherent ash was used as a bed material. Experiments with biomass were realized combusting wooden pellets (according to the standard ENplus A1) and using a lightweight ceramic aggregate with a mean diameter of 1.12 mm as a bed material, which is described in detail in [7].…”

Section: Methodsmentioning

confidence: 99%

“…Bubbling fluidized bed (BFBs) as well as circulation fluidized bed combustors (CFBs) allow the combustion of fuels of different sizes, moisture content, and heating values, and therefore can be used not only for the combustion of coal, but also for the combustion of biomass or various alternative fuels. The operating temperatures in the fluidized bed are in the range of 800-950 °C [7]. This lower operating temperature range also leads to a lower formation of NO X .…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of the efficiency of selective non-catalytic reduction in a bubbling fluidized bed combustor

et al. 2022

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Controlling nitrogen oxide (NOX) emissions is still a challenge as increasingly stringent emission limits are introduced. Strict regulations will lead to the need to introduce secondary measures even for boilers with bubbling fluidized bed (BFB), which are generally characterized by low NOX emissions. Selective non-catalytic reduction has lower investment costs compared to other secondary measures for NOX reduction, but the temperatures for its efficient utilization are difficult to achieve in BFBs. This paper studies the possibility of an effective application of selective non-catalytic reduction (SNCR) of nitrogen oxides in a pilot-scale facility with a bubbling fluidized bed. The effect of temperatures between 880 and 950 °C in the reagent injection zone on NOX reduction was investigated. For the selected temperature, the effect of the amount of injected reagent, urea solution with concentration 32.5%wt., was studied. The experiments were carried out using 500 kWth pilot scale BFB unit combusting lignite. In addition, an experiment was performed with the combustion of wooden pellets. With reagent injection, all experiments led to the reduction of nitrogen oxides and the highest NOX reduction of 58% was achieved.

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“…One of the most relevant drawbacks of FB processes is the occurrence of agglomeration phenomena due to bed sintering induced by alkali content in fuels, in particular wastes and residues, leading to plant malfunction and maintenance intervention [33]. In this respect, using suitable and cheap alternative materials to silica sand would be effective for inhibition of agglomeration phenomena [34,35]. Comminution phenomena are also likely to occur in FB plants and should be considered as possible causes of loss in efficiency [36].…”

Section: Introductionmentioning

confidence: 99%

Fluidized Bed Combustion and Gasification of Fossil and Renewable Slurry Fuels

Miccio

Raganati²,

Ammendola³

et al. 2021

Energies

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This article provides a comprehensive review of the state of the art and more recent developments of the thermochemical treatments of slurry fuels in fluidized beds (FB). The review focuses on FB combustion and gasification of slurry fuels based on coal, biomass, sludge, and wastes from industry, agriculture, and the civil sector. The investigations at research and industrial levels over the last decades are presented and discussed, highlighting the adopted technological solutions, the results in terms of feasibility and efficiency, and the perspectives of future development. The different behavior between bubbling and circulating beds was addressed, in particular the optimal choice depending on the process (combustion/gasification/pyrolysis) and fuel properties (e.g., water content). Fundamental studies on interactions between the slurry fuels and the hot bed materials are also reviewed. The cumulative trend of reviewed investigations over the last decades depicts the abandonment of coal-based mixtures used in large plants, and the growing interest in the use of biomass-based slurries for small size application. In this respect, the shift from coal to biomass opens new challenges because of the different properties of biomass (density, fibrous structure, spontaneous degradation, hydrophilic behavior, etc.). Biomass-based slurries circumvent problems posed by using solid dry biomass, particularly in handling, storing, and feeding. Although slurry fuels represent a narrow sector, the results of the research investigations and the experience gained with coal can be exploited to contribute to the achievement of a circular approach based on renewable resources in the near future.

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External bed materials for the oxy-fuel combustion of biomass in a bubbling fluidized bed

Cited by 9 publications

References 53 publications

Comparison of Temperature, Radiation Rate, Heat Loss, Furnace and Thermal Efficiencies of Different Plates in the FBC Combustion Chamber

Comparison of Temperature, Radiation Rate, Heat Loss, Furnace and Thermal Efficiencies of Different Plates in the FBC Combustion Chamber

Experimental verification of the efficiency of selective non-catalytic reduction in a bubbling fluidized bed combustor

Fluidized Bed Combustion and Gasification of Fossil and Renewable Slurry Fuels

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