Optimization of key parameters for continuous and precise nitrogen injection in goaf based on response surface methodology

Zhu, Hongqing; Hu, Lifen; Qu, Baolin; Liao, Qi; Tian, Chang; Song, Xiaozhen; Fang, Xiyang; Zhang, Xuedong

doi:10.1007/s11356-022-25037-7

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…GCSC disasters have always been an important disaster that affects underground safety mining [40][41][42]. Because of its long cycle, strong concealment and great harm, the method of pre-disaster prevention can effectively reduce the losses caused by disasters.…”

Section: Limitations and Perspectivesmentioning

confidence: 99%

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

Feng

Xue-bo

et al. 2023

Sustainability

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As the coal mine gets deeper and the stopes’ structures become more complex, gas and coal spontaneously burned composite disaster seriously threatens the efficient operation of coal mines. To study the interaction process and disaster-causing mechanism of gas and coal spontaneous combustion (GCSC), this paper establishes a numerical model to study the influence of drilling location/pressure and N2 injection on the evolution of gas and coal spontaneously burned composite disaster in the goaf. The simulation shows that in the central part of the goaf, a combined area of gas and coal combustion poses a possibility of spontaneous combustion calamity, and the length of the compound disaster area is about 20 m. The methane (CH4) explosion zone and the dioxygen(O2) temperature rise zone do not overlap in the air entrance roadway and return air roadway, indicating that there is no risk of compound disasters. The optimal nitrogen (N2) injection rate for this working face is 2000 m3/h, and the N2 port should be located 25 m profound into the goaf, which can effectively drive the diffusion of N2 and narrow the O2 zone’s breadth. The findings have considerable engineering applications for revealing the evolution process, risk assessment and control for GCSC compound disasters in coal mines.

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Section: Limitations and Perspectivesmentioning

confidence: 99%

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

Feng

Xue-bo

et al. 2023

Sustainability

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“…In the I2101 working face of the Qipanjing mine in China, it is recommended to inject nitrogen near the cutting hole and inject inhibitors into the RCGSER roadway for fire prevention and extinguishing measures, and fire prevention measures have been proposed in the 11101 working face, including grouting on the side of the return air roadway and nitrogen injection on the side of the retaining roadway. Zhu et al 12 determined the optimal key parameters for continuous precision nitrogen injection based on response surface methodology and Box–Behnken combination testing principles, providing valuable reference for nitrogen injection fire extinguishing technology in goaf. Liu et al 13 studied the effects of inlet nitrogen injection position, reflux nitrogen injection position, and nitrogen injection distribution ratio on the inertia plot of goaf through orthogonal experiments and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Study on Inerting Characteristics of Gas Coal by the Inerting Concentration and Ratio of an Inert Gas Mixture

Yu,

Sha,

Jin

et al. 2024

ACS Omega

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To study the effect of the inert gas mixture concentration and ratio on the spontaneous combustion reaction of gas coal, a combination of experimental research and theoretical analysis was used to study the pyrolysis and combustion kinetics characteristics of gas coal and further explore the influence of inert gas on the inerting characteristics of gas coal. Research has shown that during the entire heating reaction process of gas coal, the concentration of inert gases has little effect on the drying and desorption stages, but there is a significant lag phenomenon in the characteristic temperature points of active decomposition and degassing stages. Under the same concentration of mixed inert gases, the higher the relative percentage content of CO 2 , the more significant the change and the better the inhibitory effect. The higher the volume fraction of the inert gas, the higher the cross-temperature point. In the late stage of rapid heating of coal samples, when the volume fraction of inert gas is 40%, the rate of temperature rise increases rapidly. In a pure air environment, CO begins to be released at 80 °C, and when the temperature rises to 130 ∼ 140 °C, the concentration of CO begins to rapidly increase. Under inert conditions, the higher the relative percentage content of inert gas is, the higher the temperature point at which CO is generated. When the experimental conditions are a mixture of 30% N 2 and 10% CO 2 as inert gas, the optimal inerting effect has been achieved. The research results provide a theoretical basis for determining the optimal ratio of inert gas inerting concentrations to achieve fire prevention and extinguishing.

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Study on multi-field coupling characteristics of underground coal combustion and nitrogen injection parameter optimization

Liang,

Guo,

Cai

et al. 2024

Case Studies in Thermal Engineering

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Optimization of key parameters for continuous and precise nitrogen injection in goaf based on response surface methodology

Cited by 8 publications

References 41 publications

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

Study on Inerting Characteristics of Gas Coal by the Inerting Concentration and Ratio of an Inert Gas Mixture

Study on multi-field coupling characteristics of underground coal combustion and nitrogen injection parameter optimization

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