Numerical Simulation of Parameters Optimization for Goaf Gas Boreholes

Li, Jiajia; Gao, Jianliang; Yang, Ming; Wang, Dan; Wang, Liang

doi:10.1155/2019/3891080

Cited by 6 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(3) Basic flow equations [30,31] 1 Conservation of mass Equation: Equation (4) depicts the mass conservation equation, also known as the continuity equation.…”

Section: Boundary Conditions and Parameter Settingmentioning

confidence: 99%

Study on the Pseudo-Slope Length Effect of Buried Pipe Extraction in Fully Mechanized Caving Area on Gas Migration Law in Goaf

Zhao

et al. 2023

Sustainability

View full text Add to dashboard Cite

To study the law of gas transportation in mining areas, Fluent numerical simulation software was applied to examine the influence of different pseudo-slope lengths (PSL) on gas concentration in a U-ventilated working area under no-extraction conditions. Based on this, numerical simulation experiments were conducted on the buried pipe extraction arrangement parameters. The simulation found that when there was no extraction, the PSL had an impact on the airflow in the extraction area, which caused the airflow in the extraction area to be disordered, causing gas to accumulate locally at the working area. When the buried pipe depths (BPDs) and PSLs of the working area worked together, the gas concentration of the working area was lower when the inlet air influence zone and the extraction influence zone were through; otherwise, gas concentration accumulation occurred at the working area. The research results showed that when the PSL was at 25 m and BPD was at 20 m, the gas concentration at the working area was not abnormal, and the gas concentration in the upper corner was lower. By adjusting the PSL and BPD of the test working area, the maximum gas concentration in the upper corner was reduced to 0.46% and the maximum gas concentration in the return air outlet was reduced to 0.41%. The experimental and practical results provide important reference values for coal and gas co-mining.

show abstract

“…(3) Basic flow equations [30,31] 1 Conservation of mass Equation: Equation (4) depicts the mass conservation equation, also known as the continuity equation.…”

Section: Boundary Conditions and Parameter Settingmentioning

confidence: 99%

Study on the Pseudo-Slope Length Effect of Buried Pipe Extraction in Fully Mechanized Caving Area on Gas Migration Law in Goaf

Zhao

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…The change in borehole spacing affects the decreasing rate of gas content in the rock and coal around the roadway. Liu J [22] et al simulated the ground extraction drilling position in the goaf (the distance from the top of the coal seam and the distance from the return to the wind) and defined the final hole of the ground extraction hole in the goaf is 16 m from the roof of the coal seam, and the distance from the return air is 45 m, the extraction effect was optimal.…”

Section: Introductionmentioning

confidence: 99%

Determination of Gas Extraction Borehole Parameters in Fractured Zone on ‘Borehole in Place of Roadway’ Based on RSM-GRA-GA

et al. 2022

View full text Add to dashboard Cite

Large-diameter gas extraction borehole is considered an effective method by which to realize coal mine methane exploitation and outburst prevention. Efficient gas extraction can be achieved by selecting the right borehole parameters. In this paper, by comparing several conventional objective weighting methods, the PCA was used to assign the weights to the research indices, the optimization objective was reduced from multi-dimensional to one-dimensional with the help of the gray correlation analysis. The study of gas extraction effect under different borehole parameters based on the response surface model. Numerical simulations were used to analyze the mixed volume of gas extraction, the pure volume of extraction and the concentration in the upper corner after extraction under different schemes. Finally, a genetic algorithm degree model was used to solve the solution and determine the optimal arrangement of borehole parameters. The study shows that (1) the weight shares of borehole stratum, borehole diameter and borehole spacing were 0.385, 0.285 and 0.33, respectively, in the reduced dimensional analysis of the PCA. (2) Using the results of improved gray correlation analysis as a comprehensive evaluation value to measure the effect of gas extraction, the optimal range of the model was 28–30 m borehole level, 190–210 mm borehole diameter and 5.5–6.5 m borehole spacing. (3) Using the genetic algorithm to solve the model, we obtained the borehole layer 28.79 m, borehole diameter 199.89 mm, borehole spacing 5.76 m. The borehole gas extraction effect was good under this parameter. The extraction mixed volume was 129.8 m3/min, the extraction pure volume was 9.16 m3/min, the upper corner concentration was 0.52%, and the prediction accuracy of the model was 97.8%.

show abstract

“…Liu et al 20 used FLUENT software to simulate the effect of ground drilling location on gas drainage on the working face. Wang et al 21 used FLUENT software to simulate the air flow effect in the goaf, based on the porosity of the overlying rock obtained by PFC simulation.…”

Section: Introductionmentioning

confidence: 99%

Study on the optimal position of the roof low roadway based on the response surface methodology

Zhu

Fang

Huo

et al. 2021

Sci Rep

View full text Add to dashboard Cite

For determine the optimum position of the roof low roadway, the optimal solution is derived according to the response surface methodology. The UDEC numerical simulation of the overburden gives the porosity distribution of the strike fractured zone, the upper limit heights of the caving zone and the fractured zone are obtained as 18 m and 65 m, respectively. Based on the porosity distribution, the FLUENT numerical models of the goaf zone, air inlet roadway, air return roadway, working face and roof low roadway were established to simulate the gas concentration in the upper corner and gas drainage volume in roof low roadway during mining. Using the vertical and horizontal distance of the roof low roadway as the influencing factors, the experimental scheme of the position of the roof low roadway was designed according to the response surface method, and the response values were obtained from the FLUENT simulation experiments, predicting that the vertical and horizontal distances of the roof low roadway were 7.7 m and 5.9 m respectively when the interaction between the gas concentration in the upper corner and gas drainage volume in roof low roadway was optimal. Field tests showed that the average gas concentration in the upper corner and the average gas drainage volume in roof low roadway were 0.432% and 40.861 m3/min respectively, both of which were less than 10% of the error from the simulations. The design of the roof low roadway has effectively managed the gas accumulation problem in the upper corner.

show abstract

Numerical Simulation of Parameters Optimization for Goaf Gas Boreholes

Cited by 6 publications

References 24 publications

Study on the Pseudo-Slope Length Effect of Buried Pipe Extraction in Fully Mechanized Caving Area on Gas Migration Law in Goaf

Study on the Pseudo-Slope Length Effect of Buried Pipe Extraction in Fully Mechanized Caving Area on Gas Migration Law in Goaf

Determination of Gas Extraction Borehole Parameters in Fractured Zone on ‘Borehole in Place of Roadway’ Based on RSM-GRA-GA

Study on the optimal position of the roof low roadway based on the response surface methodology

Contact Info

Product

Resources

About