3-D simulation of gases transport under condition of inert gas injection into goaf

Liu, Mao-Xi; Shi, Guoqing; Guo, Zhixiong; Wang, Yanming; Ma, Liyang

doi:10.1007/s00231-016-1775-8

Cited by 52 publications

(20 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Related research studies have shown that under the effect of gravity, the density of a gas mixture will affect its migration trend in the vertical direction in a gob. 17,18 There are many coal-fired power plants in China's major coal-producing regions, and a correspondingly, large amount of low-oxygen flue gas is produced in the production process. Table 1 compares the relevant characteristics of the N 2 , CO 2 , and power plant flue gas for fire prevention in a gob.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, due to the complexity and inaccessibility of the gob area, onsite observation and measurement of the oxidation and self-heating process of the residual coal are difficult to perform. 27 Based on the computational fluid dynamics (CFD) technique, relevant scholars have studied the evolution process, 28 influencing factors 27,[29][30][31][32] and prevention measures 17,18,[33][34][35][36][37] of coal spontaneous combustion in gobs. Yuan and Smith studied the self-heating process of coal in a longwall gob with 3D numerical simulation and analyzed the influence of the ventilation system and coal properties.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in order to ensure the inerting effect, the gas injection flow rate needs to be increased significantly, which further increases the production cost to a certain extent. Related research studies have shown that under the effect of gravity, the density of a gas mixture will affect its migration trend in the vertical direction in a gob 17,18 . There are many coal‐fired power plants in China's major coal‐producing regions, and a correspondingly, large amount of low‐oxygen flue gas is produced in the production process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Targeted inertization with flue gas injection in fully mechanized caving gob for residual coal spontaneous combustion prevention with CFD modeling

Huang

Wang

Dai

et al. 2020

Energy Science & Engineering

View full text Add to dashboard Cite

The spontaneous combustion of coal is one of the major hazards in the mining, storage, and transportation of coal. There are numerous examples of spontaneous coal fires in major coal-producing countries such as the United States, China, Australia, India, and South Africa. 1-4 The safety hazards, resource losses, and environmental issues caused by this persistent problem have attracted widespread attention. 3,5

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Targeted inertization with flue gas injection in fully mechanized caving gob for residual coal spontaneous combustion prevention with CFD modeling

Huang

Wang

Dai

et al. 2020

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…The gas injection position is one of the major factors affecting the inerting efficacy of fire prevention in goafs, and the ideal injection sites are located in the oxidation zone or in the transitional zone between the oxidation zone and the heat dissipation zone [15]. Experimental study provided relevant data for revealing the mechanism, as well as a theoretical basis, for the development and application of fire prevention and extinguishing technology using carbon dioxide [16].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of multisource injection of carbon dioxide into goafs based on orthogonal test and fuzzy comprehensive theory

Cheng

Zhu

2019

Heliyon

View full text Add to dashboard Cite

Carbon dioxide is a common inert gas used for fire prevention and extinguishing fires in underground coalmines. However, the single pipeline used for carbon dioxide injection has the characteristics of a narrow inerting area, serious gas leakage in the field, and poor control. To address these risks, we herein propose a technique for multisource injection of carbon dioxide and for building up an index system of carbon dioxide injection for fire prevention and extinguishing in goafs by analysing the parameters of the gas injection pipe, mining technique, and physical qualities of the inert gas. In addition, a mathematical multi-pipeline and multisource model is built on the basis of the diffusion model of carbon dioxide injection with a single pipeline. To improve the insertion efficiency of carbon dioxide injection, a parameter optimisation method of multisource injection based on an orthogonal test and the fuzzy comprehensive theory is proposed. Using the orthogonal test and the FLUENT numerical simulation method, the relationship of the mining speed at the working face, gas injection position, height of the pipeline outlet, and gas flow are studied. Furthermore, the optimal injection parameters are calculated using fuzzy comprehensive theory. The application of this model at the No.7271 working face in the Yaoqiao Coalmine shows that the optimal injection parameters are calculated with the gas injection volume being 500 m 3 /h, the gas injection depth being 90 m, and the pipeline number being two. After adopting the optimal parameters of carbon dioxide injection, the concentration of oxygen demonstrates an obvious downward tendency, which is the same as the numerical simulation result. In conclusion, the technique for multisource injection of carbon dioxide can effectively reduce the width of the oxidation zone and prevent spontaneous combustion accidents in goafs.

show abstract

“…With the development of computer technology, computer numerical simulation in particular, the computational fluid dynamics (CFD) method has been widely used to study the dispersion and spatial distribution of dust particles in recent years [10]. Extensive CFD modeling work on dust dispersion in various workplaces in underground mines has been carried out considering different airflows, particle sizes, dust sources, and mechanisms of dust transport [11][12][13]. The numerical simulation results agree well with the field data, which can serve as a basis for evaluating and monitoring dust pollution in underground coal mines.…”

Section: Introductionmentioning

confidence: 99%

Optical Estimation on Pollution Level of Respirable Dust Based on Infrared Transmitting Behavior in Coalmine Fully Mechanized Working Face

Wang

Shi

2016

Journal of Spectroscopy

Self Cite

View full text Add to dashboard Cite

Respirable coal particle generated during underground mining is the main cause for gas-dust explosions and coal workers’ pneumoconiosis (CWP) which needs accurate monitoring especially on its concentration. Focusing on the coal dust pollution in the fully mechanized working face of Huangbaici coalmine, coal particle was sampled for further industrial analysis and FT-IR test to obtain its chemical composition and optical constant. Combined with the simulated spatial distribution of airborne dust, the spectral transmission characteristics of coal dust within wavelengths of 2.5 to 25 μm under different operating conditions were obtained. The simulation results show that the transmittance and aerosol optical depth (AOD) of coal dust are closely linked and obviously influenced by the variation of dust generation source (intensity of dust release, position of coal cutting, and the wetting of the coal seam) and airflow field (wind speed and direction of ventilation). Furthermore, an optical channel of 1260–1280 cm−1(7.937–7.813 μm) which is almost only sensitive to the variation of dust concentration but dull to the diameter change of coal dust was selected to establish the correlation of dust concentration and infrared transmittance. The fitting curve was then applied to retrieve the equivalent dust concentration based on optical information, and the comparison results demonstrate that the estimated pollution level is consistent with field measurement data in engineering practice.

show abstract

3-D simulation of gases transport under condition of inert gas injection into goaf

Cited by 52 publications

References 9 publications

Targeted inertization with flue gas injection in fully mechanized caving gob for residual coal spontaneous combustion prevention with CFD modeling

Targeted inertization with flue gas injection in fully mechanized caving gob for residual coal spontaneous combustion prevention with CFD modeling

Optimisation of multisource injection of carbon dioxide into goafs based on orthogonal test and fuzzy comprehensive theory

Optical Estimation on Pollution Level of Respirable Dust Based on Infrared Transmitting Behavior in Coalmine Fully Mechanized Working Face

Contact Info

Product

Resources

About