On the time coupling analysis of explosion pressure and intermediate generation for multiple flammable gases

Luo, Zhenmin; Li, Dafang; Su, Bin; Zhang, Siqi; Deng, Jun

doi:10.1016/j.energy.2020.117329

Cited by 46 publications

(17 citation statements)

References 45 publications

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“…From the literature [22], the viscosity change of the slurry material can be fitted as the following function law: Figure 2: Fracture geometry model. 4 Geofluids…”

Section: Governing Equation Of Slurry Fracturing and Diffusionmentioning

confidence: 99%

“…Since the depth of coal mining in China has gradually increased into kilometers, the requirements of grouting for stopping up water during the construction of vertical shafts have also become higher [1,2]. Deep well construction disturbed rock formations have characteristics such as high geostress, poor microfracture connectivity, and high pore water pressure [3][4][5][6]. According to the conventional grouting scheme in shallow formations, it is difficult to effectively block bored well water.…”

Section: Introductionmentioning

confidence: 99%

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Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting

et al. 2020

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The coupling effect of a slurry and the fractured rock layer controls a spatial attenuation of the fracture channel width and grouting pressure from a grouting hole to the slurry top of fracture diffusion. This paper comprehensively considers the influencing factors such as the mechanical properties of the injected rock mass and the time-varying characteristics of the serous viscosity and introduces the control equation of the fracture channel width to establish a single-fracture nonslab fracturing grouting model. Combining the motion law of the slurry with the extension form of fracture, the equation of slurry diffusion motion, considering the fracture geometry and the time-varying characteristics of the serous viscosity, is derived. Comparing this equation with the existing theories and experiments, the validity and reliability of the theory are verified. In this paper, the effects of rock elastic modulus, slurry viscosity, and grouting rate on the fracturing grouting diffusion law of rock mass are analyzed. It is pointed out that when fracturing grouting in deep rock layers, a larger initial grouting rate and grouting pressure should be selected in the early stages of grouting to generate or penetrate fractures in the rock layer. Also, when the grouting pressure is stable, it is appropriate to increase the viscosity so that the slurry can quickly gel in the fractures thus sealing the fractures.

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“…From the literature [22], the viscosity change of the slurry material can be fitted as the following function law: Figure 2: Fracture geometry model. 4 Geofluids…”

Section: Governing Equation Of Slurry Fracturing and Diffusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting

et al. 2020

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“…Combining Equations (8) and 9, the constitutive equation that considers strata stress, methane pressure, adsorption-induced strain, and temperature can be expressed as [33] 3 Geofluids…”

Section: Governing Equations Of Coal Deformationmentioning

confidence: 99%

“…The target for underground CBM production in China is 14 billion m 3 in 2020, according to the 13 th five-year plan of the Development and Utilization of Coalbed Methane [7]. Preextraction of CBM can reduce the risk of methane explosion [8][9][10][11] as well as coal and gas outburst.…”

Section: Introductionmentioning

confidence: 99%

Effective Methane Extraction Radius after High-Pressure Water Jet Slotting

Xia

Liu

et al. 2020

Geofluids

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The effective radius of methane extraction after high-pressure water jet slotting is the most important parameter for borehole optimization and extraction time planning. We applied a steady flow model and thermal-hydrological-mechanical (THM) coupling model to calculate the effective radius after high-pressure water jet slotting. Field measurements at the Zhongliangshan coal mine show that both the steady flow model and the THM coupling model can accurately represent the effective radius, and the THM coupling model provides further information regarding extraction time. After that, a variety of factors, including extraction time, coal burial depth, slot radius, initial permeability, and initial methane pressure, are discussed. The effective radius of a slotted borehole is 1.94 times larger than that of a conventional borehole.

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“…31 Luo and her team have studied the deflagration, pressure, and flame characteristics of methane or mixed gas in a closed vessel 32 − 34 and the coupling relationship between the explosion pressure and explosive intermediate. 35 She used the time difference between the peak explosion pressure and the peak CH 2 O concentration to measure the strength of their relationship. The coupling relationship has also been confirmed in the experimental study by Su.…”

Section: Introductionmentioning

confidence: 99%

Coupling Analysis of Chemiluminescence and Pressure Changes in CH₄/Air Explosion Suppressed by NaHCO₃ Powder

Cui¹,

Li²,

Yang³

2020

ACS Omega

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This paper presents the coupling relationship between the flame emission spectrum and explosion characteristics of CH 4 /air mixtures with NaHCO 3 powder added. Due to the test of different concentrations of suppression powder in 20 L spherical-explosion-test devices, the flame emission spectrum and explosion pressure data were collected. In this experiment, four kinds of excited radicals, including CN*, HCHO*, CO*, and OH*, have a higher probability of being detected, and the changes of their existence duration and spectral intensity show strong regularity. Results reveal that for suppressant concentration in the range of 0–50 mg/L, together with the improvement of a suppression effect, the existence duration and spectral intensity of CN*, CO*, and OH* decrease, which is opposite to that of HCHO*. Besides, the spectral intensity of OH* and CO* shows a good linear relationship with the change of the maximum explosion pressure. Controlling the content of CN*, CO*, OH*, and HCHO* is of great significance in suppressing the explosion.

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On the time coupling analysis of explosion pressure and intermediate generation for multiple flammable gases

Cited by 46 publications

References 45 publications

Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting

Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting

Effective Methane Extraction Radius after High-Pressure Water Jet Slotting

Coupling Analysis of Chemiluminescence and Pressure Changes in CH₄/Air Explosion Suppressed by NaHCO₃ Powder

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On the time coupling analysis of explosion pressure and intermediate generation for multiple flammable gases

Cited by 46 publications

References 45 publications

Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting

Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting

Effective Methane Extraction Radius after High-Pressure Water Jet Slotting

Coupling Analysis of Chemiluminescence and Pressure Changes in CH4/Air Explosion Suppressed by NaHCO3 Powder

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Coupling Analysis of Chemiluminescence and Pressure Changes in CH₄/Air Explosion Suppressed by NaHCO₃ Powder