Oxyfuel Combustion in a Bubbling Fluidized Bed Combustor

Hrdlička, Jan; Skopec, Pavel; Opatřil, Jan; Dlouhý, Tomáš

doi:10.1016/j.egypro.2016.01.012

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…The 30 kW th experimental facility has been comprehensively described elsewhere [16] and so it will be described only briefly here. Its scheme is given in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Experimental verification of the impact of the air staging on the NOx production and on the temperature profile in a BFB

et al. 2022

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The results of an experimental research on air staging in a bubbling fluidized bed (BFB) combustor are presented within this paper. Air staging is known as an effective primary measure to reduce NOX formation. However, in the case of a number of industrial BFB units, it does not have to be sufficient to meet the emission standards. Then selective non-catalytic reduction (SNCR) can be a cost-effective option for further reduction of the already formed NOX. The required temperature range at the place of the reducing agent injection for an effective application of the SNCR without excessive ammonia slip is above the temperatures normally attained in BFBs. The aim of this paper is to evaluate the impact of staged air injection on the formation of NOX in BFB combustors and to examine the possibility of increasing the freeboard temperature. Several experiments with various secondary/primary air ratios were performed with a constant oxygen concentration in the flue gas. The experiments were carried out using wooden biomass and lignite as fuel in a 30 kWth laboratory scale BFB combustor. Furthermore, the results were verified using a 500 kWth pilot scale BFB unit. The results confirmed that the air staging can effectively move the dominant combustion zone from the dense bed to the freeboard section, and thus the temperatures for an effective application of the SNCR can be obtained.

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“…The 30 kW th experimental facility has been comprehensively described elsewhere [16] and so it will be described only briefly here. Its scheme is given in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Experimental verification of the impact of the air staging on the NOx production and on the temperature profile in a BFB

et al. 2022

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“…A definition of the recirculation ratio r, the ratio of volume flow rate of recirculated flue gas related to the volume flow rate of generated flue gas, can be found in [21].…”

Section: Oxyfuel Combustion In a Bubbling Fluidized Bed Combustor (Bfbc)mentioning

confidence: 99%

“…The following assumptions were made: Consequently, the required power could be calculated using Equation (21). A power reserve was added to ensure smooth operation for real applications.…”

Section: Fluidization Of Fuel and Bed Materialsmentioning

confidence: 99%

Power-to-Green Methanol via CO2 Hydrogenation—A Concept Study including Oxyfuel Fluidized Bed Combustion of Biomass

et al. 2021

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A revolution of the global energy industry is without an alternative to solving the climate crisis. However, renewable energy sources typically show significant seasonal and daily fluctuations. This paper provides a system concept model of a decentralized power-to-green methanol plant consisting of a biomass heating plant with a thermal input of 20 MWth. (oxyfuel or air mode), a CO2 processing unit (DeOxo reactor or MEA absorption), an alkaline electrolyzer, a methanol synthesis unit, an air separation unit and a wind park. Applying oxyfuel combustion has the potential to directly utilize O2 generated by the electrolyzer, which was analyzed by varying critical model parameters. A major objective was to determine whether applying oxyfuel combustion has a positive impact on the plant’s power-to-liquid (PtL) efficiency rate. For cases utilizing more than 70% of CO2 generated by the combustion, the oxyfuel’s O2 demand is fully covered by the electrolyzer, making oxyfuel a viable option for large scale applications. Conventional air combustion is recommended for small wind parks and scenarios using surplus electricity. Maximum PtL efficiencies of ηPtL,Oxy = 51.91% and ηPtL,Air = 54.21% can be realized. Additionally, a case study for one year of operation has been conducted yielding an annual output of about 17,000 t/a methanol and 100 GWhth./a thermal energy for an input of 50,500 t/a woodchips and a wind park size of 36 MWp.

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“…Oxy–fuel combustion may be considered as a carbon capture technology producing a stream rich in CO 2 , suitable (after further cleaning) for transport and storage. , In oxy–fuel combustion, a mixture of pure oxygen (purity >95%) and either dry or partially wet recycled flue gas (RFG) is typically used as a combustion medium. The sufficient flue gas recirculation must be kept in order to sustain the fluidization in the case of FB technologies and to moderate the temperature of the combustion process. The off-gas from oxy–fuel combustion can be (after steam condensation and removal of remaining emission components) directly compressed and transported to a storage site .…”

Section: Introductionmentioning

confidence: 99%

Fluidized Bed Incineration of Sewage Sludge in O₂/N₂ and O₂/CO₂ Atmospheres

et al. 2018

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Sewage sludge incineration in a fluidized bed is considered to be one of the most suitable ways of sewage sludge disposal. This process reduces the volume of the waste and causes the destruction of organic contaminants such as POPs, pharmaceuticals, and other compounds with endocrine-disrupting potential. Oxygen-enriched air combustion and oxy–fuel combustion can increase the combustion efficiency, reduce the amount of flue gas, and make possible CO2 capture more effective. However, the influence of incineration medium composition has not yet been thoroughly investigated in the case of sewage sludge incineration. In this paper, the incineration of sewage sludge in a bubbling fluidized bed reactor was studied at oxygen-enriched air conditions, oxy–fuel conditions, and oxy–fuel conditions with zero and nonzero concentrations of steam, CO, NO, N2O, and SO2 in the inlet combustion medium. Consequently, the effects of various operating parameters on pollutants formation were comprehensively described with emphasis on aforementioned sewage sludge incineration processes. An increase in combustion temperature resulted in an increase in NO x and SO2 emissions and in a decrease in N2O emissions. Increase in inlet oxygen concentration led to a decrease in NO x and N2O emissions. N2O and SO2 emissions were higher in CO2-rich atmosphere (oxy–fuel combustion conditions). The presence of water vapor in the inlet combustion medium resulted mainly in the reduction of NO x emissions. The presence of CO, NO, N2O, and SO2 in the dry inlet combustion medium reduced mainly overall nitrogen-to-NO x conversion, while the effect on SO2 removal efficiency was only marginal.

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Oxyfuel Combustion in a Bubbling Fluidized Bed Combustor

Cited by 13 publications

References 3 publications

Experimental verification of the impact of the air staging on the NOx production and on the temperature profile in a BFB

Experimental verification of the impact of the air staging on the NOx production and on the temperature profile in a BFB

Power-to-Green Methanol via CO2 Hydrogenation—A Concept Study including Oxyfuel Fluidized Bed Combustion of Biomass

Fluidized Bed Incineration of Sewage Sludge in O₂/N₂ and O₂/CO₂ Atmospheres

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Oxyfuel Combustion in a Bubbling Fluidized Bed Combustor

Cited by 13 publications

References 3 publications

Experimental verification of the impact of the air staging on the NOx production and on the temperature profile in a BFB

Experimental verification of the impact of the air staging on the NOx production and on the temperature profile in a BFB

Power-to-Green Methanol via CO2 Hydrogenation—A Concept Study including Oxyfuel Fluidized Bed Combustion of Biomass

Fluidized Bed Incineration of Sewage Sludge in O2/N2 and O2/CO2 Atmospheres

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Fluidized Bed Incineration of Sewage Sludge in O₂/N₂ and O₂/CO₂ Atmospheres