Numerical Simulation and Engineering Application of Coalbed Water Injection

Shi, Yijie; Wang, Pengfei; Liu, Ronghua; Tan, Xuanhao; Wen, Zhang

doi:10.1155/2019/6309160

Cited by 11 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Currently, the main dust prevention methods in underground coal mine include preinjection of water into coal, ventilation, exhausting of dust, purification of air by dust remover, spraying, and dust isolation via enclosing [19][20][21][22][23][24][25]. Spraying has been extensively applied in underground mines for dedusting due to the low cost, convenient operation, and practicability [26][27][28][29][30][31]. e results in previous studies also revealed that the dust-suppression efficiency via spraying was closely related to the wettability of the coal dust.…”

Section: Introductionmentioning

confidence: 97%

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

Wang

Han

Liu

et al. 2020

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

Currently, spraying is a main means for dust prevention and control in underground coal mines. The dust-suppression efficiency via spraying is highly correlated with the wettability of coal dusts. There are many factors affecting the wettability of coal dust, among which coal’s metamorphic degree has great influence. In order to gain in-depth knowledge of the effects of coal metamorphic degree on coal dust wettability and the dust-suppression efficiency via spraying, 6 coal dust samples with different metamorphic degrees were collected and used in the study. In the experiments, the microproperties, wetting performance, and dust-suppression efficiency via spraying were measured. According to the experimental results of coal’s microproperties, with the improvement of metamorphic degree, the content of hydrophilic oxygen-containing functional groups on the surface, the surface roughness, the specific surface area, and the interpore diameter all decreased. In addition, as coal’s metamorphic degree was enhanced from lignite to meager-lean coal, the wettability of the coal dust dropped. On the other hand, as the metamorphic degree of coal quality continued to be improved to anthracite, the wettability of the coal dust increased instead. The measured results revealed that the dust-suppression efficiency via spraying was highly correlated with the wettability of coal dust. The coal dust with better wettability exhibited higher dust-suppression efficiency via spraying. With the increase of water-supply pressure, the effect of coal dust wettability on the dust-suppression efficiency via spraying was weakened, and the difference of dust-suppression efficiency among different coal dust samples was narrowed.

show abstract

Section: Introductionmentioning

confidence: 97%

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

Wang

Han

Liu

et al. 2020

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Zhen Liu et al [3] pointed out that the structure and seepage characteristics of coal samples around the borehole determine the effect of water injection. Yijie Shi et al [4] used Fluent to discuss the influence of water injection process parameters such as water injection time, water injection pressure, wellbore diameter and characteristic parameters of coalbed methane on the wetting radius. Jianlong Li et al [5] believed that wetting agents are usually used to improve the efficiency of mine dust water injection.…”

Section: Introductionmentioning

confidence: 99%

Model Of Difficulty Coal Seam Water Injection Based on Bayes Discriminant Analysis

Niu

2023

E3S Web of Conf.

View full text Add to dashboard Cite

Based on the basic idea of Bayes discriminant analysis method, the Bayes discriminant analysis model for the difficulty of coal seam water injection was established. This model selects seven indicators, namely burial depth, crack development degree, porosity, wetting edge angle, solidity coefficient, saturated water increment, and gas pressure, as discriminant factors. The difficulty of coal seam water injection is divided into three levels as three normal populations for Bayes discriminant analysis. Taking 23 groups of actual data of coal seam water injection project as training samples, Bayes discriminative model is established. Perform cross validation on 23 sets of measured data to obtain the accuracy of the model. Finally, Bayes discriminative model is applied to the actual coal seam water injection project. The research results show that the Bayes discriminant analysis model has a lower misjudgment rate and can be better applied in practical engineering.

show abstract

“…The airflow from the side air outlet forms a shielding air curtain on the roadway to prevent the spread of dust and improve the dust-catching effect of the air inlet. The wall-attached air duct can greatly improve the working environment of the fully mechanized excavation face, prevent gas accumulation on the top of the roadway, and ensure the safe production of the mine [25,26]. However, the radial air curtain produced by the wallattached air duct has a relatively weak rotation ability, and it is very easy to form a hollow air curtain due to the serious impact of the roadway environment.…”

Section: Introductionmentioning

confidence: 99%

CFD-Based Determination of the Optimal Blowing and Suction Air Volume Ratio of Dual-Radial Swirl Shielding Ventilation in a Fully Mechanized Excavation Face

Shi

et al. 2021

Geofluids

Self Cite

View full text Add to dashboard Cite

Dust is one of the main pollutants in coal mines, which seriously affects the physical and mental health of workers, as well as the safe production in underground mines. Dual-radial swirl shielding ventilation is a new ventilation method for a fully mechanized excavation face and can effectively reduce the dust concentration in the underground. The dust control effect of dual-radial swirl shielding ventilation is mainly affected by the thickness and integrity of the shielding air curtain, as well as the disturbance of the flow field near the air curtain. By changing the blowing and suction air volume ratio of the air duct, the strength of the radial air curtain can be improved, and the dust control effect of the dual-radial swirl shielding ventilation system can be effectively improved. In order to determine the optimal operating parameters of the dual-radial swirl shielding ventilation system, a numerical simulation method was used to conduct an in-depth study on the blowing and suction air volume ratio of the system. The results showed that when the blowing and suction air volume ratio of the air duct was 1.5, the radial air curtain had the highest strength. Under this condition, the dust concentration at the driver’s position of the roadheader was the lowest, and the dual-radial swirl shielding ventilation system can achieve an ideal dust control effect.

show abstract

Numerical Simulation and Engineering Application of Coalbed Water Injection

Cited by 11 publications

References 42 publications

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

Model Of Difficulty Coal Seam Water Injection Based on Bayes Discriminant Analysis

CFD-Based Determination of the Optimal Blowing and Suction Air Volume Ratio of Dual-Radial Swirl Shielding Ventilation in a Fully Mechanized Excavation Face

Contact Info

Product

Resources

About