Denitrogenation (or Oxyfuel Concepts)

Anheden, Marie; Yan, Jerry; Smedt, G. De

doi:10.2516/ogst:2005030

Cited by 35 publications

(17 citation statements)

References 12 publications

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“…The reduction can be the result of several mechanisms: increased ash retention, enhanced efficiency of conventional FGD, co-injection and the possibility for new SO x removal technologies. According to Buhre et al (2005) and Anheden et al (2005) the amount of SO x formation per tonne of coal combusted is essentially unchanged when applying oxyfuel combustion. However, the composition and concentration of SO x , constituting SO 2 and SO 3 , does change as the flue gas stream is reduced in both volume and mass.…”

Section: Sulphur Dioxidementioning

confidence: 99%

Carbon Dioxide Capture and Air Quality

Horssen¹,

Ramirez²,

Harmelen³

et al. 2011

Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality

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Section: Sulphur Dioxidementioning

confidence: 99%

Carbon Dioxide Capture and Air Quality

Horssen¹,

Ramirez²,

Harmelen³

et al. 2011

Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality

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“…The advantage of oxygen supply via OTM is its scalability, so that even small units can be operated with consistently high efficiency. This was already demonstrated for a dead end membrane operation mode, where permeated oxygen is removed from the membrane inside by a vacuum and added to the combustion process [4,5,6].Simulations show that there could be theoretical cost advantages of OTM compared to cryogenic air separation (ASU) for large scale operation such as oxy-combustion [7,8,9]. Nevertheless, some technological challenges still have to be overcome in order to be able to use OTM´s for oxygen supply on a large scale.…”

Section: Introductionmentioning

confidence: 98%

Design and fabrication of large-sized planar oxygen transport membrane components for direct integration in oxy-combustion processes

Schulze‐Küppers

Drago

Ferravante

et al. 2019

Separation and Purification Technology

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Membrane-based oxy-combustion is a promising technology for energy efficient combustion of carboncontaining fuels with the simultaneous opportunity to capture CO2 from the resulting exhaust gas.However, oxy-combustion conditions result in special demands on the design of the ceramic membrane components due to the high pressure and temperature applied. Therefore, we have developed a planar membrane design for 4-end operation using asymmetric membranes of La0.6Sr0.4Co0.2Fe0.8O3-δ. FEM and CFD simulations have been performed in order to develop an internal channel structure that allows withstanding pressures of 5 bar on the feed side while achieving the desired O2 concentrations of 27 % in the sweep gas, i.e. CO2, and an oxygen recovery rate from the feed gas of 86 % at the same time.Due to the symmetric design of the membrane components, they are scalable and adaptable in size. This design has been realized in a process chain from powder to the final component consisting of thin 20 µm Membrane layer, support with 38 % porosity, an inner channelled architecture and a thin (3-5 µm) porous activation layer. Particular emphasis was laid on scalable manufacturing processes in order to ensure transferability to industrial scale. The process chain is also applicable to other membrane materials suitable for any application of interest. Finally, the reproducible processing was successfully demonstrated by the fabrication of membrane components in lengths of 100 mm and widths of 70 mm.

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“…However, these values increase considerably during boiler operation. Some researchers claim that an increase in exhaust gas emissions can reach 10% behind the boiler, while the VGB Power Tech Report estimates that air in-leakages in power plants currently in operation range from 8 to 16% (Anheden et al 2005;Preusche et al 2011). The model studies presented in this paper show that, apart from the boiler, air in-leakages in the oxy-fuel system may also derive from the exhaust gas recirculation system or electrostatic precipitator, flue gas desulphurization (FGD).…”

Section: Introductionmentioning

confidence: 90%

Emission of typical pollutants (NOX, SO2) in the oxygen combustion process with air in-leakages

Moroń

Ferens

Wach

2021

Environ Sci Pollut Res

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Oxygen combustion, being an alternative to air combustion, is distinguished in a variety of modern coal management technologies by quick and easy removal of CO2 from the combustion process, which is the key merit of this oxy-fuel technology. The laboratory work conducted so far has not directly addressed the issue of air in-leakages in the oxy-fuel system. The previous studies showed that air in-leakages in the combustion system (both under the air and oxygen regime) occur and affect the combustion process. However, there are no direct research studies on the volume of air in-leakages and their impact on the individual stages of combustion, including the emission of gaseous pollutants. This article focuses on the assessment of the impact of air in-leakages on NOx and SO2 emissions for a single-stage coal-dust combustion system. Moreover, these studies were supplemented with measurements on the rate of devolatilisation of volatile matters and, in particular, on the rate of nitrogen compounds released from fuel. The obtained results of combustion in the oxy-fuel atmosphere with the following air in-leakage levels: 10, 15 and 20% were compared to combustion conditions in the air. Air in-leakages in the oxygen combustion system create an additional flow of oxygen and nitrogen appearing in the combustion area, which affects the course of pollutants and their emission. The conducted studies have shown that when adequate tightness of the combustion system is provided, it contributes to the reduced emission of nitrogen compounds.

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Denitrogenation (or Oxyfuel Concepts)

Cited by 35 publications

References 12 publications

Carbon Dioxide Capture and Air Quality

Carbon Dioxide Capture and Air Quality

Design and fabrication of large-sized planar oxygen transport membrane components for direct integration in oxy-combustion processes

Emission of typical pollutants (NOX, SO2) in the oxygen combustion process with air in-leakages

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