Oxy-fuel combustion of selected solid fuels under atmospheric and elevated pressures

Lasek, Janusz; Janusz, M.; Zuwała, J.; Głód, Krzysztof; Iluk, Andrzej

doi:10.1016/j.energy.2013.04.079

Cited by 102 publications

(70 citation statements)

References 31 publications

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“…Problems associated with NO X creation and removal in the oxy-fuel combustion process are important scientific issues, researched by many R&D centers both in Poland (Lasek, 2013;and Pawlak-Kruczek et al, 2013) as well as in the rest of the world (Normann et al, 2009). NO X reduction is one of the biggest advantages of oxy-fuel combustion, therefore it is widely studied.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Oxygen Staging on Nitrogen Conversion in Oxy-Fuel CFB Environment

Jankowska¹,

Czakiert²,

Krawczyk³

et al. 2014

Chemical and Process Engineering

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This paper presents a study on nitrogen conversion in oxy-fuel coal combustion in a pilot scale CFB 0.1 MW th facility. The paper is focused on fuel-N behaviour in the combustion chamber when the combustion process is accomplished under oxy-fuel CFB conditions. The analysis is based on infurnace sampling of flue gas and calculations of the conversion ratios of fuel-nitrogen (fuel-N) to NO, NO 2 , N 2 O, NH 3 and HCN. For the tests, O 2 /CO 2 mixtures with the oxygen content of 21 vol.% (primary gas) and with the oxygen content varied from 21 to 35 vol.% (secondary gas), were used as the fluidising gas. Measurements were carried out in 4 control points located along the combustion chamber: 0.43 m, 1.45 m, 2.50 m and 4.88 m. Results presented below indicate that an increased oxygen concentration in the higher part of the combustion chamber has strong influence on the behaviour of fuel based nitrogen compounds.

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Section: Introductionmentioning

confidence: 99%

The Effect of Oxygen Staging on Nitrogen Conversion in Oxy-Fuel CFB Environment

Jankowska¹,

Czakiert²,

Krawczyk³

et al. 2014

Chemical and Process Engineering

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“…The kinetics of the chemical reaction is independent of the apparatus, which gives the same model of chemical reaction kinetics based on the Arrhenius equation for all the global models. However, different devices have their own transport limitations which result in specific mass transport Reaction rate in HPTGA thermobalance Extrapolated rate of chemical reaction Experimental value of reaction rate in HPTGA thermobalance Rate of O₂ transport in the crucible of HPTGA thermobalance Reaction rate in the particle raised in the gas Rate of O₂ transport to the particle raised in a gas oxy-combustion of coal in entrained flow reactor [22] combustion in fluidised bed reactor [23] oxy-combustion in fluidised bed reactor [4] Fig. …”

Section: Discussionmentioning

confidence: 99%

“…Since the oxy-combustion of coal char is a heterogeneous reaction, it can proceed under three different reaction-controlling regimes: chemical kinetics, mixed internal diffusion-chemical kinetics and external diffusion [8,9]. Oxy-combustion in a fluidised bed boiler occurs at a temperature of 1073-1173 K where diffusion limitations exist [3,4,10]. The scaling-up of this process requires an extensive computational analysis, which is critical for proper boiler design.…”

Section: Introductionmentioning

confidence: 99%

“…The process product is a gas consisting mostly of CO 2 and water vapour. The considerable concentration of CO 2 in the gas enables direct referral to sequestration, which is followed by condensation of water vapour [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…• Lasek et al [4] who examined the oxy-combustion of various coal types in a fluidised bed reactor with 0.5 kg h -1 capacity. Limitation of thermogravimetry for oxy-combustion analysis of coal chars A comparison of results both from this study and from the literature indicates that in thermogravimeter the mass transport rate is much lower than in a fluidised bed which is resulting from the type and dimensions of the TG's crucible.…”

mentioning

confidence: 99%

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Limitation of thermogravimetry for oxy-combustion analysis of coal chars

Babiński

Ściążko

Ksepko

2017

J Therm Anal Calorim

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A kinetic study of the oxy-combustion of chars obtained from two Polish steam coals was conducted. A comparative study was focused on the data analysis concerning oxy-combustion of coal chars collected from two thermobalances, which differed in construction, design of crucibles, sample size and gas flow direction. The influence of individual factors such as temperature, O 2 concentration, the dimensions of the crucibles and the dimensions of the char bed on the reaction rate was analysed. On the basis of these results, a global kinetic model was elaborated showing the influence of all factors, particularly mass transfer conditions, on reaction rates. The developed model can be extended to other mass transfer conditions or fluidised bed conditions and can be applied to other fast reactions to ensure they occur in the chemical reaction kinetics control regime during TG tests. It was concluded that the gas-solid fuel contact characteristics are crucial for the measured reaction rate and for the interpretation of kinetic data.

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Experimental study Char‐NO reduction characteristics at elevated pressure

Zhang

Wang

Chen

et al. 2021

Asia-Pacific J Chem Eng

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In order to decouple the reduction process of Char‐NO under pressurized conditions, a pressurized horizontal tube furnace experimental system was used to explore the NO reduction characteristics of pressurized pyrolysis char samples prepared under different conditions (0.3–1.2 MPa, 800–1000°C, 0.3–3.0 s). The research results showed that increasing pyrolysis pressure/temperature/residence time can inhibit the Char‐NO characteristics. When the environmental pressure increased, the reduction rate of NO gradually increased. As the reduction time increased, the total reduction of NO and the contents of C(N) structure on the surface of the residual char samples increased, some N‐5 structure with poor thermal stability would gradually undergo condensation polymerization to form N‐6 and N‐Q structures under the high temperature/high pressure conditions. Under the real pressurized conditions, the effect of reducing NO by char samples was the best at 0.6 MPa under real pressurized conditions in the pressure range of 0.3–1.2 MPa.

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Oxy-fuel combustion of selected solid fuels under atmospheric and elevated pressures

Cited by 102 publications

References 31 publications

The Effect of Oxygen Staging on Nitrogen Conversion in Oxy-Fuel CFB Environment

The Effect of Oxygen Staging on Nitrogen Conversion in Oxy-Fuel CFB Environment

Limitation of thermogravimetry for oxy-combustion analysis of coal chars

Experimental study Char‐NO reduction characteristics at elevated pressure

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