CFD simulation of spontaneous coal combustion in irregular patterns of goaf with multiple points of leaking air

2008 ◽  
Vol 18 (4) ◽  
pp. 504-515 ◽  
Author(s):  
Zong-xiang LI
Keyword(s):  
Coal Combustion ◽  
Cfd Simulation ◽  
Multiple Points ◽  
Spontaneous Coal Combustion

Adiabatic spontaneous coal combustion period derived from the thermal effect of spontaneous combustion

Energy ◽  
2021 ◽  
pp. 122101
Author(s):  
Li Yan ◽  
Hu Wen ◽  
Wenyong Liu ◽  
Yongfei Jin ◽  
Yin Liu ◽  
...  
Keyword(s):  
Thermal Effect ◽  
Coal Combustion ◽  
Spontaneous Combustion ◽  
Spontaneous Coal Combustion

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

Energies ◽  
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.

A model for assessing the compound risk represented by spontaneous coal combustion and methane emission in a gob

2020 ◽  
Vol 273 ◽  
pp. 122925 ◽  
Author(s):  
Yu Xu ◽  
Zijun Li ◽  
Huasen Liu ◽  
Xiaowei Zhai ◽  
Rongrong Li ◽  
...  
Keyword(s):  
Methane Emission ◽  
Coal Combustion ◽  
Spontaneous Coal Combustion

Numerical evaluation of inclined heat pipes on suppressing spontaneous coal combustion

2020 ◽  
Vol 56 (6) ◽  
pp. 1861-1874 ◽  
Author(s):  
Fangming Cheng ◽  
Zhuchuan Chang ◽  
Jun Deng ◽  
Fan Nan ◽  
Anbang Zhang ◽  
...  
Keyword(s):  
Coal Combustion ◽  
Numerical Evaluation ◽  
Heat Pipes ◽  
Spontaneous Coal Combustion

Relationship Between the Nanopore Structure and Basic Characteristics of Coal with the Protogenetic CO Content

2021 ◽  
Vol 21 (1) ◽  
pp. 505-514
Author(s):  
Bo Tan ◽  
Gang Cheng ◽  
Xianbing Yang ◽  
Xiaoman Zhu ◽  
Mingming Hu ◽  
...  
Keyword(s):  
Coal Combustion ◽  
Coal Sample ◽  
Synthesis Process ◽  
Elemental Content ◽  
Coal Seams ◽  
Gas Emission ◽  
Internal Factors ◽  
Exponential Power Distribution ◽  
Spontaneous Coal Combustion ◽  
Co Gas

In the prediction and forecasting of spontaneous coal combustion, protogenetic CO produced in the process of coal oxidation is used as the indicator gas, but the sources of CO gas in coal seams are extensive. Protogenetic CO in coal seams often interferes with predictions of spontaneous coal combustion. To predict the content of protogenetic CO gas in coal seams and its emission, this study established an experimental system of protogenetic CO content and emission in coal seams. Six groups of coal samples were tested, and the CO emission content was determined per hour within 24 hours of obtaining each coal sample. Four kinds of protogenetic CO gas emission indexes were defined. Then, internal factors of coal, including industrial components, elemental content and pore structure, were analysed. Finally, the relationship between the protogenetic CO gas emission index of coal seams and the internal factors of coal was obtained. The results indicate that the relation between the CO dispersion concentration and the time of the coal sample follows an exponential power distribution. The internal factors of coal influence the content and emission of protogenetic CO in coal seams, but there is no strict correlation with each parameter as it is a multi-parameter correlation synthesis process.

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