NOx and SO2 Emission During OXY-Coal Combustion

Abstract The paper presents results of coal behaviour during combustion in oxy-fuel atmosphere. The experiment was performed using 3 meter long Entrained Flow Reactor and 1 meter long Drop Tube Reactor. Three hard coals and two lignites were analysed in order to investigate NOx, SO2 emission and fly ash burnout. The measurements were performed along and at the outlet of a combustion chamber for one- and two - stage combustion. In the second stage of the experiment, kinetic parameters for nitrogen evolution during combustion in oxy - fuel and air were calculated and the division of nitrogen into the volatile matter and the char was measured. The conducted experiment showed that emissions in oxy - fuel are lower than those in air.

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Mass Absorption Corrected X-ray Diffraction Analysis of Entrained-Flow Reactor Coal Combustion Products

Advances in X-ray Analysis ◽

10.1154/s0376030800014749 ◽

1990 ◽

Vol 34 ◽

pp. 429-435

Author(s):

Leo W. Collins ◽

David L. Wertz

Keyword(s):

Coal Combustion ◽

Initial Phase ◽

Flow Reactor ◽

Combustion Process ◽

Combustion Products ◽

X Ray Diffraction ◽

Coal Combustion Products ◽

X Ray ◽

Entrained Flow ◽

Entrained Flow Reactor

AbstractThe analysis of coal and the understanding of the combustion process is complex, due to the heterogeneous nature of the material and the myriad of high-temperature reactions inherent in this fossil fuel. The research presented below utilizes recently-developed x-ray diffraction methods to analyze the coal combustion products generated from a laboratory-scale entrained-flow reactor. The reactor was designed, constructed, and tested, as planned for the initial phase of a long-term project to evaluate the coals located in Mississippi. In this initial phase a well-characterized coal was used, supplied by The Pennsylvania State University. The proximate, ultimate, and sulfur analyses of the coal, PSOC 1368p, are outlined in the Appendix. X-ray diffraction techniques have been used In the past to characterize coals. An analysis of the mineral transformation during coal combustion has also been performed using x-ray diffraction instrumentation. The semi-quantitative results of the pyrite (FeS2) phase transformation at variable temperatures and the percent combustion of the coal, as determined by x-ray methods are reported below.

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Simulation Study of the Formation of Corrosive Gases in Coal Combustion in an Entrained Flow Reactor

Energies ◽

10.3390/en13174523 ◽

2020 ◽

Vol 13 (17) ◽

pp. 4523

Author(s):

Maximilian von Bohnstein ◽

Coskun Yildiz ◽

Lorenz Frigge ◽

Jochen Ströhle ◽

Bernd Epple

Keyword(s):

Coal Combustion ◽

Cfd Simulation ◽

Flow Reactor ◽

Three Dimensional ◽

Mineral Matter ◽

Sulfur Species ◽

Entrained Flow ◽

Trace Species ◽

Entrained Flow Reactor ◽

Gaseous Sulfur

Gaseous sulfur species play a major role in high temperature corrosion of pulverized coal fired furnaces. The prediction of sulfur species concentrations by 3D-Computational Fluid Dynamics (CFD) simulation allows the identification of furnace wall regions that are exposed to corrosive gases, so that countermeasures against corrosion can be applied. In the present work, a model for the release of sulfur and chlorine species during coal combustion is presented. The model is based on the mineral matter transformation of sulfur and chlorine bearing minerals under coal combustion conditions. The model is appended to a detailed reaction mechanism for gaseous sulfur and chlorine species and hydrocarbon related reactions, as well as a global three-step mechanism for coal devolatilization, char combustion, and char gasification. Experiments in an entrained flow were carried out to validate the developed model. Three-dimensional numerical simulations of an entrained flow reactor were performed by CFD using the developed model. Calculated concentrations of SO2, H2S, COS, and HCl showed good agreement with the measurements. Hence, the developed model can be regarded as a reliable method for the prediction of corrosive sulfur and chlorine species in coal fired furnaces. Further improvement is needed in the prediction of some minor trace species.

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